AK STEEL HOLDING CORP
S-4/A, 1999-08-03
STEEL WORKS, BLAST FURNACES & ROLLING MILLS (COKE OVENS)
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<PAGE>


  As filed with the Securities and Exchange Commission on August 2, 1999
                                       Registration Nos. 333-75451 333-75451-01
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                ---------------

                             AMENDMENT NO. 3
                                      TO

                                   FORM S-4

            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                ---------------
                   Issuer of Senior Notes registered hereby
                             AK STEEL CORPORATION
            (Exact Name of Registrant as Specified in its Charter)

<TABLE>
 <S>                            <C>                          <C>
           DELAWARE                         3312                      31-1401455
 (State or Other Jurisdiction   (Primary Standard Industrial       (I.R.S. Employer
      of Incorporation or       Classification Code Number)       Identification No.)
         Organization)
</TABLE>

                  Guarantor of Senior Notes registered hereby
                         AK STEEL HOLDING CORPORATION
            (Exact Name of Registrant as Specified in its Charter)

<TABLE>
 <S>                            <C>                          <C>
           DELAWARE                         3312                      31-1401455
 (State or Other Jurisdiction   (Primary Standard Industrial       (I.R.S. Employer
      of Incorporation or       Classification Code Number)       Identification No.)
         Organization)
</TABLE>
                               703 Curtis Street
                            Middletown, Ohio 45043
                                (513) 425-5000
              (Address, Including Zip Code, and Telephone Number,
       including Area Code, of Registrants' Principal Executive Offices)

                              James L. Wainscott
             Vice President, Treasurer and Chief Financial Officer
                             AK Steel Corporation
                               703 Curtis Street
                            Middletown, Ohio 45043
                                (513) 425-5000
                    (Name and Address, Including Zip Code,
       and Telephone Number, Including Area Code, of Agent For Service)

                         Copies of communications to:
                            Stephen H. Cooper, Esq.
                          Weil, Gotshal & Manges LLP
                               767 Fifth Avenue
                         New York, New York 10153-0119
                                (212) 310-8000

Approximate date of commencement of proposed sale to the public: As soon as
   practicable after the effective date of this Registration Statement.

  If any of the securities being registered on this Form are to be offered in
connection with the formation of a holding company and there is compliance
with General Instruction G, check the following box. [_]

  If this Form is filed to register additional securities for an offering
pursuant to Rule 462 (b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]

  If this Form is a post-effective amendment filed pursuant to Rule 462 (d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]


  The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant
shall file a further amendment which specifically states that this
registration statement shall thereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933 or until the registration statement
shall become effective on such date as the Securities and Exchange Commission,
acting pursuant to said Section(a), may determine.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. THESE  +
+SECURITIES MAY NOT BE SOLD UNTIL THE REGISTRATION STATEMENT FILED WITH THE    +
+SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN    +
+OFFER TO SELL NOR DOES IT SEEK AN OFFER TO BUY THESE SECURITIES IN ANY        +
+JURISDICTION WHERE THE OFFER OR SALE IS NOT PERMITTED.                        +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                             SUBJECT TO COMPLETION,

                           DATED AUGUST 2, 1999

PROSPECTUS

EXCHANGE OFFER FOR
$450,000,000 OF 7 7/8% SENIOR NOTES DUE 2009

AK STEEL CORPORATION
                                                                          [LOGO]


                      Material Terms of the Exchange Offer

 .  Expires 5:00 p.m., New       .  The exchange will not be
   York City time, on     ,        a taxable event for U.S.
   1999, unless extended           federal income tax
                                   purposes
 .  All old notes that are
   validly tendered and not     .  The terms of the new
   withdrawn will be               notes to be issued in the
   exchanged for new notes         exchange offer are
                                   identical to those of the
 .  The only conditions to          old notes that were
   completing the exchange         issued on February 10,
   offer are that it does          1999, except for transfer
   not violate any                 restrictions and
   applicable law or               registration rights
   interpretation of the           relating to the old notes
   Staff of the Securities
   and Exchange Commission      .  Affiliates of our company
   and that no action or           may not participate in
   proceeding has been             the exchange offer
   instituted or threatened
   that would prohibit or
   impair our ability to
   proceed with the exchange
   offer

 .  You may withdraw your
   tender of old notes at
   any time prior to the
   expiration of the
   exchange offer

   PLEASE REFER TO "RISK FACTORS" BEGINNING ON PAGE 9 OF
                      THIS PROSPECTUS
   FOR IMPORTANT INFORMATION YOU SHOULD CONSIDER BEFORE
                 TENDERING YOUR OLD NOTES.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED THE NOTES TO BE ISSUED IN THIS EXCHANGE OFFER, NOR HAS
ANY OF THESE ORGANIZATIONS DETERMINED THAT THIS PROSPECTUS IS TRUTHFUL OR
COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                                 ------------

                   The date of this prospectus is     , 1999.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                          Page
                                                                          ----
<S>                                                                       <C>
Prospectus Summary.......................................................   1
Risk Factors.............................................................   9
Where You Can Find More Information......................................  13
Recent Developments......................................................  15
Selected Consolidated AK Holding and Armco
 Unaudited Pro Forma Combined Financial Data.............................  16
Use of Proceeds..........................................................  17
Capitalization...........................................................  18
Description of Outstanding Indebtedness .................................  19
The Exchange Offer.......................................................  21
Description of New Notes.................................................  30
Federal Income Tax Consequences..........................................  64
Plan of Distribution.....................................................  65
Legal Matters............................................................  65
Experts..................................................................  65
Forward-Looking Statements...............................................  66
Unaudited Pro Forma Combined Condensed Financial Information.............  67
</TABLE>

                               ----------------

  You should rely only on the information contained in this document or to
which we have referred you. We have not authorized anyone to provide you with
information that is different. This document may only be used where it is
legal to sell these securities. The information in this document may only be
accurate on the date of this document.

                                       i
<PAGE>

                               PROSPECTUS SUMMARY

  The following summary highlights selected information from this prospectus
and may not contain all of the information that is important to you. This
prospectus includes the specific terms of the notes we are offering, as well as
information regarding our business. We encourage you to read this prospectus in
its entirety.

                                  Our Company

  AK Steel is a leading integrated steel producer. We concentrate on the
production of premium quality coated, cold rolled and hot rolled carbon steel
primarily for sale to customers in the automotive, appliance, construction and
manufacturing industries. We also cold roll and aluminum coat stainless steel
for automotive industry customers.

  On May 20, 1999, we agreed to acquire Armco Inc., a leading producer of
stainless and electrical steels. The stainless and electrical steel industry is
a relatively small but distinct segment of the overall steel industry that
represented approximately 2% of domestic steel tonnage but accounted for
approximately 14% of domestic steel revenues in 1998. Through its Sawhill
Tubular division, Armco also manufactures a wide range of steel pipe and tubing
products for use in the construction, industrial and plumbing markets. Armco
also owns Douglas Dynamics, L.L.C., the largest North American manufacturer of
snowplows for four-wheel drive light trucks, and an industrial park on the
Houston. You should read the discussion under the heading "Recent Developments"
for further information regarding this acquisition.

  Our executive offices are located at 703 Curtis Street, Middletown, Ohio
45043 and our telephone number is (513) 425-5000.

                               The Exchange Offer

  On February 10, 1999, we completed the private placement of $450,000,000
principal amount of our 7 7/8% Senior Notes Due 2009. Those notes were not
registered under the Securities Act and, therefor, they are subject to
significant restrictions on resale. Accordingly, when we sold those notes, we
entered into a registration rights agreement with the initial purchasers in
which we agreed to deliver to you this prospectus and to permit you to exchange
those old notes for new notes with identical terms that have been registered
under the Securities Act. We believe that the new notes may be resold by you
without compliance with the registration and prospectus delivery provisions of
the Securities Act, subject to limited conditions. Following the exchange
offer, any old notes that you did not exchange for new notes will continue to
be subject to restrictions on resale and we will have no obligation to you to
register those old notes under the Securities Act.

  We issued the old notes under an indenture that grants you specified rights.
The new notes also will be issued under that indenture and you will continue to
have the same rights under the indenture that you had prior to the exchange
offer. Any reference to "notes" in this prospectus refers to both old notes and
new notes, unless the context otherwise requires. You should read the
discussion under the heading "Description of New Notes" for further information
regarding the new notes.

                                       1
<PAGE>


The Exchange Offer......    We are offering to exchange $1,000 principal amount
                            of our 7 7/8% Senior Notes Due 2009 that we have
                            registered under the Securities Act for each $1,000
                            principal amount of our outstanding 7 7/8% Senior
                            Notes Due 2009 that we issued in February 1999 in a
                            private placement and that have not been registered
                            under the Securities Act. All outstanding old notes
                            that are validly tendered and not validly withdrawn
                            will be exchanged. As of this date, there are
                            $450,000,000 aggregate principal amount of our old
                            notes outstanding.

                            We will issue the new notes promptly after the ex-
                            piration of the exchange offer.

Resale..................    We believe that the new notes that you receive in
                            the exchange offer may be offered for resale, re-
                            sold and otherwise transferred by you without com-
                            pliance with the registration and prospectus deliv-
                            ery provisions of the Securities Act provided that:

                            .  you are not an affiliate of our company, as the
                               term affiliate is defined in Rule 405 under the
                               Securities Act;

                            .  you acquire the new notes in the ordinary course
                               of your business; and

                            .  you are not participating, do not intend to par-
                               ticipate and have no arrangement or understand-
                               ing with any person to participate, in the dis-
                               tribution of the new notes.

                            If you do not meet the above conditions, you may
                            incur liability under the Securities Act if you
                            transfer any new note issued to you in the exchange
                            offer without delivering a prospectus meeting the
                            requirements of the Securities Act or without an
                            exemption from registration of your notes from
                            those requirements. We do not assume, or indemnify
                            you against, that liability.

                            If you are a broker-dealer and receive new notes in
                            the exchange offer for your own account in exchange
                            for old notes that you acquired as a result of mar-
                            ket-making or other trading activities, you must
                            acknowledge that you will deliver a prospectus
                            meeting the requirements of the Securities Act in
                            connection with any resale of those new notes. You
                            may use this prospectus for this purpose.

Expiration Date.........    The exchange offer will expire at 5:00 p.m., New
                            York City time, on      1999, unless we decide to
                            extend the exchange offer. We do not intend to ex-
                            tend the exchange offer, although we reserve the
                            right to do so. In no event will we ex- tend the
                            exchange offer beyond      , 1999.

                                       2
<PAGE>


Conditions to the
Exchange Offer..........    The exchange offer is subject to customary
                            conditions, any of which we may waive. The exchange
                            offer is not conditioned upon any minimum principal
                            amount of notes being tendered. See "The Exchange
                            Offer--Conditions to the Exchange Offer."

Procedures for
Tendering Notes.........    If you wish to tender your old notes for exchange,
                            you must transmit to Fifth Third Bank, Cincinnati,
                            Ohio, as exchange agent, on or before the expira-
                            tion date, either

                            .  a properly completed and duly executed letter of
                               transmittal, which accompanies this prospectus,
                               or a facsimile of the letter of transmittal, to-
                               gether with your old notes and any other re-
                               quired documentation; or

                            .  a computer-generated message transmitted by
                               means of The Depository Trust Company's Auto-
                               mated Tender Offer Program system and forming a
                               part of a confirmation of book entry transfer in
                               which you acknowledge and agree to be bound by
                               the terms of the letter of transmittal.

                            If you cannot comply with either of these proce-
                            dures on a timely basis, then you should follow the
                            guaranteed delivery procedures described below.

                            By executing or agreeing to be bound by the terms
                            of the letter of transmittal, you will be deemed to
                            make the representations to us described in "The
                            Exchange Offer" section of this prospectus under
                            the heading "Procedures for Tendering."

Special Procedures for
Beneficial Owners.......    If you are a beneficial owner of old notes that are
                            registered in the name of a broker, dealer, commer-
                            cial bank, trust company or other nominee and you
                            wish to tender those old notes for exchange, you
                            should contact the registered holder promptly and
                            instruct the registered holder to tender those
                            notes on your behalf. If you wish to tender those
                            notes yourself, you must either make appropriate
                            arrangements to re-register ownership of the notes
                            in your own name or obtain a properly completed
                            bond power from the registered holder. The transfer
                            of registered ownership to your own name may take
                            considerable time and you may not be able to com-
                            plete the transfer prior to the expiration date.

Guaranteed Delivery
Procedures..............    If you wish to tender your old notes for exchange
                            and time will not permit the documents required by
                            the letter of transmittal to

                                       3
<PAGE>

                            reach the exchange agent prior to the expiration
                            date, or you cannot complete the procedure for
                            book-entry transfer on a timely basis, you may ten-
                            der your notes according to the guaranteed delivery
                            procedures described in the instructions in the ac-
                            companying transmittal letter.

Acceptance of Tendered
Old Notes and Delivery
of New Notes............

                            Subject to the conditions described in "The
                            Exchange Offer" section of this prospectus under
                            the heading "Conditions to the Exchange Offer", we
                            will accept for exchange any and all old notes that
                            are validly tendered in the exchange offer and not
                            withdrawn, prior to 5:00 p.m., New York City time,
                            on the expiration date.

                            You may withdraw the tender of your old notes at
Withdrawal Rights.......    any time prior to 5:00 p.m., New York City time, on
                            the expiration date, subject to compliance with the
                            procedures for withdrawal described in "The Ex-
                            change Offer" section of this prospectus under the
                            heading "Withdrawal Rights."

Federal Income Tax
Considerations..........    The exchange of the old notes will not be a taxable
                            event for U.S. federal income tax purposes.

Exchange Agent..........
                            Fifth Third Bank, Cincinnati, Ohio, the trustee un-
                            der the indenture governing the notes, is serving
                            as the exchange agent. The address, telephone num-
                            ber and facsimile number of the exchange agent are
                            set forth in "The Exchange Offer" section of this
                            prospectus under the heading "Exchange Agent."

Consequences of Failure
to Exchange Notes.......    If you do not exchange your old notes for new
                            notes, your old notes will continue to be subject
                            to significant restrictions on resale. In general,
                            the old notes may not be offered or sold unless
                            registered under the Securities Act, except pursu-
                            ant to an exemption from, or in a transaction not
                            subject to, the Securities Act. We do not currently
                            plan to register the old notes under the Securities
                            Act.

Use of Proceeds.........    We will not receive any proceeds from the exchange
                            offer.

                                       4
<PAGE>

                       Summary of Terms of the New Notes


Issuer..................    AK Steel Corporation.

Issue...................    $450,000,000 aggregate principal amount of 7 7/8%
                            Senior Notes Due 2009.

Maturity Date...........    February 15, 2009.

Interest Payment            February 15 and August 15 of each year, beginning
Dates...................    August 15, 1999. Interest on the new notes that we
                            will issue will accrue from the last interest pay-
                            ment date on which interest was paid on the old
                            notes surrendered in exchange, or, if no interest
                            has been paid on the old notes, from February 10,
                            1999, which was the date of original issuance of
                            the old notes.

Optional Redemption.....    We may redeem the notes, in whole at any time or in
                            part from time to time, at our option, on or after
                            February 15, 2004, at the redemption prices set
                            forth in the "Description of New Notes" section of
                            this prospectus under the heading "Optional
                            Redemption." In addition, at any time on one or
                            more occasions before February 15, 2002, we may, at
                            our option, redeem up to a cumulative aggregate of
                            $157.5 million principal amount of the notes with
                            money that we raise in public or private equity
                            offerings, provided that:

                            . we pay to holders of the notes a redemption price
                              of 107.875% of the face amount of the notes we
                              redeem, plus accrued interest;

                            . we complete the redemption within 60 days of com-
                              pleting the related equity offering; and

                            . at least $292.5 aggregate principal amount of the
                              notes remains outstanding after the redemption.

Guarantee...............    The new notes will be unconditionally guaranteed on
                            a senior basis by our parent company, AK Steel
                            Holding Corporation. The guarantee will be equal in
                            right of payment with all other senior unsecured
                            indebtedness and guarantees issued by our parent
                            company.

Ranking.................    The new notes will be:

                            . senior unsecured obligations of our company and
                             will be equal in right of payment with all of our
                             other existing and future senior unsecured debt;
                             and

                            . effectively junior to all of our secured obliga-
                             tions to the extent of the collateral securing
                             those obligations, including the $250 million of
                             our currently outstanding Senior Secured Notes Due
                             2004.

                                       5
<PAGE>


Change in Control.......    If a change in control of AK Steel occurs, you will
                            have the right to require us to repurchase your new
                            notes at a purchase price equal to 101% of their
                            aggregate principal amount on the date of repur-
                            chase, plus any accrued interest. If a change of
                            control were to occur, however, we may not have
                            sufficient funds to repurchase your notes at the
                            time we are required to do so.

Material Covenants......    The indenture governing the notes contains cove-
                            nants that, among other things, limit our ability
                            and the ability of our subsidiaries to:

                            . create liens on our assets to service debt;

                            . incur additional indebtedness;

                            . make investments;

                            . issue or sell equity interests of subsidiaries;

                            . pay dividends or distributions on, or redeem or
                             repurchase, capital stock;

                            . redeem subordinated obligations;

                            . transfer or sell assets;

                            . engage in transactions with affiliates;

                            . engage in unrelated businesses; and

                            . consolidate, merge or transfer substantially all
                             of ourassets.

                            These covenants are subject to important exceptions
                            and qualifications, which are described in the "De-
                            scription of New Notes" section of this prospectus
                            under the heading "Material Covenants."

Form of New Notes.......    The new notes will be represented by one or more
                            permanent global certificates, in fully registered
                            form, deposited with a custodian for, and regis-
                            tered in the name of a nominee of, DTC, as deposi-
                            tary. You will not receive notes in certificated
                            form unless there occurs one of the events set
                            forth in the "Description of New Notes" section of
                            this prospectus under the heading "Form of New
                            Notes." Instead, beneficial interests in the new
                            notes will be shown on, and transfers of these in-
                            terests will be effected only through, records
                            maintained in book-entry form by DTC and its par-
                            ticipants.


                                       6
<PAGE>

                 Summary Historical Consolidated Financial Data

                   (dollars in millions, except per ton data)

  The following summary historical consolidated financial data have been
derived from, and should be read in conjunction with, the consolidated
financial statements of AK Steel Holding Corporation included in its Annual
Report on Form 10-K for the year ended December 31, 1998 and its Quarterly
Report on Form 10-Q for the three months ended March 31, 1999.

  There is no summarized financial information included for AK Steel because
there is no substantial difference in the operations of AK Steel and AK Holding
and because the debt of AK Steel is fully and unconditionally guaranteed by AK
Holding. AK Holding has no independent operations.

<TABLE>
<CAPTION>
                                                               Three Months
                                Years Ended December 31,      Ended March 31,
                               ----------------------------  ------------------
                                 1996      1997      1998      1998      1999
                               --------  --------  --------  --------  --------
<S>                            <C>       <C>       <C>       <C>       <C>
Statement of Operations Data:
Net sales....................  $2,301.8  $2,440.5  $2,393.6  $  588.2  $  632.2
Cost of products sold........   1,846.5   1,964.5   1,963.4     483.6     521.5
Selling and administrative
 expenses....................     114.7     114.8     118.8      29.2      30.2
Depreciation.................      76.1      79.8      97.8      21.2      33.2
Operating profit.............     264.5     281.4     213.6      54.2      47.3
Interest expense.............      39.8      76.3      56.0      15.7      24.7
Other income.................      12.3      36.4      18.6       6.9       3.2
Income before income taxes ..     237.0     241.5     176.2      45.4      25.8
Provision for income taxes...      91.1      90.6      61.7      17.0      (1.8)
Net income...................  $  145.9  $  150.9  $  114.5  $   28.4  $   27.6
<CAPTION>
                                   As of December 31,         As of March 31,
                               ----------------------------  ------------------
                                 1996      1997      1998      1998      1999
                               --------  --------  --------  --------  --------
<S>                            <C>       <C>       <C>       <C>       <C>
Balance Sheet Data:
Cash, cash equivalents, and
 short-term investments......  $  739.3  $  606.1  $   83.0  $  576.2  $  498.2
Working capital..............   1,005.1     658.2     276.1     643.2     386.7
Total assets.................   2,650.8   3,084.3   3,306.3   3,211.8   3,771.4
Current portion of long-term
 debt(1).....................       --        --        --        --      325.0
Long-term debt (excluding
 current portion)............     875.0     997.5   1,145.0   1,145.0   1,280.0
Current portion of pension
 and postretirement benefit
 obligations.................       0.1       0.1       0.1       0.1       --
Long-term pension and
 postretirement benefit
 obligations (excluding
 current portion)............     564.9     554.1     572.6     560.5     578.2
Stockholders' equity.........  $  777.0  $  879.6  $  929.5  $  872.3  $  952.9
<CAPTION>
                                                               Three Months
                                Years Ended December 31,      Ended March 31,
                               ----------------------------  ------------------
                                 1996      1997      1998      1998      1999
                               --------  --------  --------  --------  --------
<S>                            <C>       <C>       <C>       <C>       <C>
Other Data:
Ratio of earnings to combined
 fixed charges(2)............       4.6x      2.9x      2.0x      2.1x      1.5x
EBITDA (as defined)(3).......  $  355.4  $  399.7  $  330.0  $   82.3  $   83.7
Ratio of EBITDA (as defined)
 to interest expense(4)......       6.7x      3.8x      2.9x      2.9x      2.4x
Operating profit per ton ....  $     60  $     61  $     46  $     50  $     37
Capital investments..........  $  141.6  $  636.5  $  772.6  $  197.3  $   84.1
Flat rolled shipments
 (thousands of tons).........     4,383     4,647     4,602     1,088     1,274
</TABLE>
- --------
Footnotes appear on following page.

                                       7
<PAGE>


Notes:

(1) Proceeds from the sale of AK Steel's 7 7/8% Senior Notes Due 2009 were
    invested in short-term U.S. government obligations prior to being used to
    finance the redemption on April 1, 1999 of $325.0 million in principal
    amount of AK Steel's 10 3/4% Senior Notes Due 2004 at an aggregate cost of
    $338.1 million.

(2) For the purpose of calculating the ratio of earnings to combined fixed
    charges,

    (a) earnings consist of income before income taxes, extraordinary items
      and effects of accounting change, the distributed income of less than
      50%-owned affiliates, plus fixed charges and

    (b) combined fixed charges consist of interest, whether expensed or
      capitalized, and preferred stock dividends.

  For two of the three months ended March 31, 1999, interest expense was
  included for both the 7 7/8% Senior Notes Due 2009 and the 10 3/4% Senior
  Notes Due 2004.

(3) EBITDA, an acronym that stands for earnings before interest expense,
    provision for income taxes, depreciation and amortization, is a widely
    accepted indicator of a company's ability to service its debt. EBITDA does
    not represent net income or cash flow from operations as those items are
    defined by generally accepted accounting principles. It should not be
    considered by holders of the notes as an alternative to net income and does
    not necessarily indicate whether cash flows will be sufficient to fund cash
    needs. The indenture governing the notes employs a modified definition of
    EBITDA, under which non-cash post-employment benefits, other than pensions,
    and non-cash special charges are added to earnings. The indenture provides
    for the addition of these amounts because

    (a) a component of retiree medical expense is a non-cash item,
      representing an estimate of future medical costs, and

    (b) some of AK Steel's special charges are non-cash items.

  EBITDA (as defined) is calculated under the indenture as follows:

<TABLE>
<CAPTION>
                                          Years Ended December  Three Months
                                                  31,          Ended March 31,
                                          -------------------- ---------------
                                           1996   1997   1998   1998    1999
                                          ------ ------ ------ ------- -------
   <S>                                    <C>    <C>    <C>    <C>     <C>
   Net income............................ $145.9 $150.9 $114.5 $  28.4 $  27.6
   Plus: Provision for income taxes......   91.1   90.6   61.7    17.0    (1.8)
      Depreciation.......................   76.1   79.8   97.8    21.2    33.2
      Interest expense...................   39.8   76.3   56.0    15.7    24.7
      Noncash OPEB.......................    2.5    2.1    --      --      --
                                          ------ ------ ------ ------- -------
   EBITDA (as defined)................... $355.4 $399.7 $330.0 $  82.3 $  83.7
</TABLE>

   Thus, EBITDA, as defined and used in the indenture and as shown in this
   table, is not comparable to similarly titled measures used by other
   companies. A full definition of the term "EBITDA", as used in the indenture,
   appears under the heading "Defined Terms" in the "Description of New Notes"
   section of this prospectus. Under the indenture, subject to limited
   exceptions, AK Steel may not incur additional indebtedness unless the ratio
   of pro forma consolidated EBITDA (as defined) to interest expense would be
   greater than 2.5 to 1.0.

(4) For the purpose of calculating the ratio of EBITDA (as defined) to interest
    expense, interest expense consists of interest, whether expensed or
    capitalized, amortization of debt issuance costs and dividends on any
    preferred stock that may be issued.

                                       8
<PAGE>

                                  RISK FACTORS

  You should carefully consider the risks described below before making a
decision to tender your old notes for exchange.

We are substantially leveraged, which could adversely affect our ability to
fulfill our obligations under the notes.

  Our substantial outstanding debt has important consequences to you, including
the risk that we may not generate sufficient cash flow from operations to pay
principal and interest on our indebtedness, including the notes, or to invest
in our businesses.While we can raise cash to satisfy our obligations through
potential sales of assets or equity, our ability to raise funds by selling
either assets or equity depends on our results of operations, market
conditions, restrictions contained in the indentures relating to the notes and
our other outstanding senior notes and other factors. If we are unable to
refinance indebtedness or raise funds through sales of assets or equity or
otherwise, we may be unable to pay principal of and interest on the notes.

  At March 31, 1998, we had total outstanding consolidated long-term debt of
approximately $1.28 billion, including approximately $250.0 million of secured
debt, and stockholders' equity of $952.9 million. Our interest expense was
$56.0 million for the year ended December 31, 1998 and $24.7 million for the
three months ended March 31, 1999. Upon consummation of the merger with Armco,
we will assume approximately $225.0 million of indebtedness under the Armco
senior notes. While none of our outstanding debt ranks senior to the notes, our
secured debt will effectively rank senior to the notes to the extent of the
collateral securing that indebtedness. In addition, the covenants contained in
the indentures relating to the notes and our other outstanding senior notes,
permit us to incur additional indebtedness under limited circumstances. Any
additional indebtedness we may incur may rank equally with or junior to the
notes and will not by its terms rank senior to the notes.

If a change of control occurs, we may be unable to repurchase your notes. This
failure would constitute an event of default under the indenture relating to
the notes and our other debt instruments.

  If a change of control as defined in the indenture relating to the notes
occurs, we cannot assure you that we will have available, or be able to obtain,
sufficient funds, or will be permitted by our debt instruments, to repurchase
your notes. The indenture relating to the notes provides that if a change of
control occurs, you will have the right to require us to repurchase your notes
at 101% of their principal amount, plus any accrued and unpaid interest to the
repurchase date. Our failure to repurchase your notes would constitute an event
of default under the indenture, which would in turn constitute a default under
the agreement governing our secured notes and the indentures governing our
other outstanding senior notes. See "Description of New Notes--Change in
Control Offer." If any of these events of default were to occur, we may be
unable to pay the accelerated principal amount of and interest on the notes.

The liquidity of any market for the old notes could be adversely affected after
completion of the exchange offer. In addition, there may be no active trading
market for the new notes issued in the exchange offer.

  There has been no public market for the old notes. If most holders of the old
notes tender their notes in the exchange offer, the liquidity for the old notes
not tendered in the exchange offer could

                                       9
<PAGE>

be adversely affected upon completion of the exchange offer. In addition, we
cannot assure you with respect to:

  (1) the liquidity of any market for the new notes that may develop,

  (2) your ability to sell new notes or

  (3) the price at which you will be able to sell those new notes.

  If a public market were to exist, the new notes could trade at prices that
might be higher or lower than their principal amount or purchase price,
depending on many factors, including prevailing interest rates, the market for
similar notes, and our financial performance. We do not intend to list the new
notes on any securities exchange or to seek approval for quotations through any
automated quotation system. No active market for the new notes is currently
anticipated. Credit Suisse First Boston Corporation and PNC Capital Markets,
Inc., the initial purchasers of the old notes, have advised us that they
currently anticipate making a secondary market for the new notes, but they are
not obligated to do so. As a result, an active or liquid public trading market
for the new notes may never develop.

There is limited support for our parent company's guarantee.

  The new notes will be unconditionally guaranteed on a senior basis by our
parent company, AK Steel Holding Corporation. Our parent company derives all of
its operating income and cash flow from our company and our outstanding common
stock is its only material asset. The indenture governing the notes contains a
covenant restricting our parent company from holding any assets other than
securities of our company. Accordingly, its ability to perform on its guarantee
will be dependent on our own financial condition and net worth.

We rely heavily on the automotive industry, which has experienced significant
fluctuations in demand, and, therefore, our revenues in the future could
decline.

  Our strategy depends upon continued growth in demand for premium quality
coated and cold rolled carbon and stainless steel products, particularly from
the automotive industry. Fluctuations in demand can adversely affect our
operations and reduce margins and profitability. The domestic automotive
industry has historically experienced significant fluctuations in demand, based
on such factors as general economic conditions, interest rates and consumer
confidence. In addition, strikes, lock-outs, work stoppages or other production
interruptions in the automotive industry can adversely affect the demand for
our products.

The failure to successfully negotiate renewals of our union contracts could
adversely affect our ability to operate or reduce our profitability.

  As of December 31, 1998, we had approximately 5,800 active employees, of whom
approximately 54% were represented by the Armco Employees Independent
Federation, Inc., 17% by the United Steelworkers of America and 6% by the Oil,
Chemical and Atomic Workers Union. A strike or work stoppage could adversely
affect our ability to operate if we are unable to negotiate new agreements with
our represented employees when the existing agreements expire in 2000 and 2001.
Also, our profitability could be adversely affected if increased costs
associated with any future contract are not recoverable through productivity
improvements or price increases.

                                       10
<PAGE>

We face intense competition, which could significantly reduce our
profitability.

  Competition within the steel industry is intense. This competition affects
the prices that we can charge for our products, the utilization of our
production facilities, our ability to sell higher value products and,
ultimately, our profitability.

  In the sale of flat rolled carbon steel we compete primarily on the basis of
product quality, responsiveness to customer needs and price with other
integrated steel producers and, to a lesser extent, mini-mills. Mini-mills,
which are relatively efficient, low-cost producers that produce steel from
scrap in electric furnaces, have increased their ability to produce higher
quality products, which has enabled them to become more competitive with
integrated steel producers and, in periods of weak demand, has increased
pressure on prices and margins. Moreover, U.S. carbon steel producers have
historically faced significant competition from foreign producers, and the
strength of the U.S. dollar relative to foreign currencies has heightened this
competition in the United States in the past year.

  We are currently cold rolling, aluminum coating and marketing Series 400
stainless steel, at an annual rate of approximately 70,000 tons, for use in
automotive exhaust systems. The Rockport Works is intended, in part, to enable
us to substantially expand our presence in the market for flat rolled stainless
steel, which is associated with higher margins than carbon steel, including the
premium grades. Total domestic consumption of flat rolled stainless steel was
over 1.7 million tons in 1997. We intend to cold roll and finish approximately
385,000 tons of stainless steel per year at the Rockport Works. However,
because the high margins associated with stainless steel significantly reduce
the relative impact of shipping costs on the producer, the domestic market for
stainless steel is far more vulnerable to foreign imports and the adverse
effects of a strengthening U.S. dollar than the market for carbon steel.
Imports represented 20%, 20% and 21% of the domestic flat rolled stainless
steel market in 1995, 1996 and 1997, respectively. In addition, there has been
an increase in the capacity of foreign producers in recent years, resulting in
downward pressure on domestic prices. It is difficult to predict the amount of
stainless steel that will be imported into the U.S. in the future. Increased
domestic and foreign production capacity and growth in imports will likely
result in greater competition and have a negative impact on prices. Our ability
to profitably sell our targeted quantity of flat rolled stainless steel in this
environment will depend on our ability to finish high quality stainless steel
at a cost that is equal to or below that of our principal competitors.

We are subject to significant potential liability and compliance costs due to
environmental regulations governing the production of steel.

  Domestic steel producers, including our company, are subject to stringent
federal, state and local laws and regulations relating to the protection of
human health and the environment. Like other domestic steel producers, we have
expended, and can be expected to expend in the future, substantial amounts for
environmental control equipment. Our profitability could be significantly
reduced as a result of unexpected increases in environmental control
requirements or the incurrence of fines, penalties, remediation costs or other
liabilities relating to violations or alleged violations of environmental laws
and regulations.

We are vulnerable to the potential failure of computer systems to recognize the
year 2000.

   In operating our business, we are dependent on information technology and
process control systems that employ computers as well as embedded
microprocessors. We also depend on the proper functioning of the business
systems of third parties, including our suppliers and customers. Many computer
systems and microprocessors can only process dates in which the year is
represented by

                                       11
<PAGE>

two digits. As a result, some of these systems and processors may interpret
"00" incorrectly as the year 1900 instead of the year 2000. The failure of any
of these systems to appropriately interpret the upcoming calendar year 2000
could have a material adverse effect on our financial condition, results of
operations, cash flow and business prospects.

  We have assessed and are modifying or upgrading our business and process
control systems to achieve year 2000 compliance. We also have taken steps to
determine whether our principal suppliers and customers are or expect to be
year 2000 compliant by the end of this year. Testing of our own systems, as
well as electronic data interchange testing with these suppliers and customers,
is expected to be substantially completed by September 30, 1999. We currently
expect our costs for year 2000 compliance to total approximately $5.0 million.
Additional expenditures beyond this amount could be required. Despite our
efforts to be year 2000 compliant, our year 2000 program and the programs of
third parties who do business with us may not be effective, and our estimates
as to the timing and cost of completing our remediation program may not be
accurate.

                                       12
<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

  We are a wholly-owned subsidiary of AK Steel Holding Corporation, which has
guaranteed the notes. As more fully described under the heading "Recent
Developments," we have publicly announced the proposed merger of Armco, Inc.
with and into our company. AK Holding and Armco file annual, quarterly and
current reports, proxy statements and other information with the SEC. You may
read and copy reports, statements or other information filed by AK Holding and
Armco at the SEC's public reference rooms in Washington, D.C., New York, New
York and Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further
information about the public reference rooms. Copies of the SEC filings made by
each of AK Holding and Armco are also available to the public from commercial
document retrieval services and at the worldwide web site maintained by the SEC
at "http://www.sec.gov." In addition, our company maintains a Web site at
"http://www.aksteel.com" that contains additional information, including news
releases about our business and operations.

  We have filed with the SEC a registration statement on Form S-4 under the
Securities Act with respect to the new notes to be issued in the exchange
offer. This prospectus, which forms a part of the registration statement, does
not contain all of the information set forth in the registration statement and
the exhibits and schedules thereto, because some of that information has been
omitted from this prospectus in accordance with the SEC's rules and
regulations. Statements made in this prospectus concerning the provisions of
various documents are not necessarily all inclusive and we refer you to the
copy of each of the documents filed as an exhibit to the registration statement
for the full text of those provisions. Each of those statements is deemed
qualified in its entirety by that reference. Unless otherwise indicated, steel
industry data contained or incorporated by reference are derived from publicly
available sources, including industry trade journals and SEC filings, which we
have not independently verified.

  The SEC allows us to "incorporate by reference" into this prospectus
information contained in another document that either AK Holding or Armco may
have filed separately with the SEC and that is publicly available. The
information so incorporated by reference is deemed to be part of this
prospectus, except to the extent it has been superseded by information
contained in this prospectus. We are incorporating by reference in this
prospectus the reports listed below and any reports filed in the future by AK
Holding with the SEC under Sections 12(a), 13(c), 14 or 15(d) of the Securities
Exchange Act of 1934 until the completion of the exchange offer.

                                       13
<PAGE>

<TABLE>
<CAPTION>
                AK HOLDING
                SEC FILINGS
            (FILE NO. 1-13696)                            PERIOD
            ------------------                            ------
<S>                                         <C>
Annual Report on Form 10-K, as amended by
 Form 10-K/A............................... Fiscal year ended December 31, 1998
Quarterly Report on Form 10-Q, as amended
 by Form 10-Q/A............................ Quarter ended March 31, 1999
Current Reports on Form 8-K................ Filed on July 21, 1999
                                            Filed on June 2, 1999
                                            Filed on May 24, 1999
                                            Filed on April 28, 1999
                                            Filed on April 15, 1999
                                            Filed on March 25, 1999
                                            Filed on February 17, 1999
                                            Filed on February 16, 1999
                                            Filed on February 3, 1999
Exhibit 1 to Form 8-A...................... Filed on February 5, 1996
<CAPTION>
             ARMCO SEC FILINGS
            (FILE NO. 1-873-2)                            PERIOD
            ------------------                            ------
<S>                                         <C>
Annual Report on Form 10-K................. Fiscal year ended December 31, 1998
Quarterly Report on Form 10-Q.............. Quarter ended March 31, 1999
Current Report on Form 8-K................. Filed on June 1, 1999
</TABLE>

  You may obtain, without charge, copies of documents incorporated by reference
in this document by requesting them in writing or by telephone from the
appropriate party as follows:

  Alan H. McCoy                            Gary R. Hildreth
   Vice President, Public Affairs           Secretary
  AK Steel Holding Corporation             Armco Inc.
  703 Curtis Street                        One Oxford Centre
  Middletown, OH 45043-0001                301 Grant Street
  (513) 425-2826                           Pittsburgh, PA 15219-1415
                                           (415) 255-9800

                                       14
<PAGE>

                              RECENT DEVELOPMENTS

The Merger

  On May 20, 1999, AK Holding and AK Steel entered into an agreement with Armco
under which Armco will be merged with and into AK Steel. The merger will be
treated as a pooling of interests for accounting purposes.

  Consummation of the merger is subject to various conditions, including the
expiration or early termination of the waiting period under the Hart-Scott-
Rodino Antitrust Improvements Act of 1976, approval of the merger by the
stockholders of both AK Steel and Armco and receipt of the requisite consents
from state insurance departments having jurisdiction over Armco's insurance
subsidiaries. We expect that the merger will be consummated by the end of the
third quarter of 1999.

  We believe that, by combining the two companies into one, we will be able to
offer a broader range of higher value-added products to a larger group of
customers, assure a reliable source of high quality semi-finished stainless
steel for finishing at our new Rockport Works facility, maximize the use of
Armco's stainless steel melt capacity, achieve enhanced efficiencies at Armco's
production facilities, and achieve substantial operating synergies and cost
savings. In light of these anticipated benefits, Standard & Poor's has publicly
stated that, upon completion of the merger, it will raise our corporate credit
and senior debt ratings to "BB." See the "Unaudited Pro Forma Combined
Condensed Financial Information" set forth on page  .

Consent Solicitation

  On July 30, 1999, we received consents from holders of the notes required to
effectuate proposed amendments to the indenture governing the notes. The
proposed amendments are intended to facilitate the orderly conduct of our
business, as well as the continued payment of regular dividends by AK Holding,
following the merger. The proposed amendments are discussed in greater detail
in the "Description of New Notes" section of this prospectus. We also have
proposed and will implement similar amendments to the indenture governing our 9
1/8% Senior Notes Due 2006 as well as our senior secured notes. The proposed
amendments will only become effective upon the consummation of the merger.

                                       15
<PAGE>

              SELECTED CONSOLIDATED AK HOLDING AND ARMCO UNAUDITED

                       PRO FORMA COMBINED FINANCIAL DATA
                  (dollars in millions, except per share data)

  The following unaudited pro forma financial information is presented for
illustrative purposes only and is not indicative of the operating results or
financial position that would have been achieved if the proposed merger of
Armco into AK Steel had been consummated at the dates indicated, nor is that
information necessarily indicative of future operating results of the combined
company. All of the information should be read in conjunction with the
historical financial statements and related notes contained in the annual,
quarterly and other reports filed with the SEC by each of AK Holding and Armco.
You should read the discussion under the heading "Recent Developments" for
further information regarding the proposed merger.

<TABLE>
<CAPTION>
                                                             Three Months Ended
                                   Years Ended December 31,       March 31,
                                  -------------------------- -------------------
                                    1996     1997     1998     1998      1999
                                  -------- -------- -------- --------- ---------
<S>                               <C>      <C>      <C>      <C>       <C>
Statement of Operations Data:
Net sales.......................  $3,996.5 $4,237.4 $4,076.9 $ 1,026.7 $ 1,034.9
Operating profit................     334.2    384.1    363.6      81.1      77.5
Income from continuing
 operations.....................  $   88.6 $  176.6 $  205.9 $    43.9 $    45.0
Income from continuing
 operations per share of common
 stock(1):
 Basic..........................      0.82     1.86     2.19      0.46      0.47
 Diluted........................      0.90     1.79     2.14      0.45      0.47
Cash dividends per share of
 common stock(2)................       n/a      n/a      n/a       n/a       n/a
<CAPTION>
                                      As of December 31,       As of March 31,
                                  -------------------------- -------------------
                                    1996     1997     1998     1998      1999
                                  -------- -------- -------- --------- ---------
<S>                               <C>      <C>      <C>      <C>       <C>
Balance Sheet Data:
Total assets....................  $4,646.9 $5,020.9 $5,189.2 $ 5,058.5 $ 5,592.5
Current portion of long-term
 debt...........................      27.2     38.2    116.9       7.0     330.9
Long-term debt (excluding
 current portion)...............   1,219.3  1,304.4  1,395.7   1,450.7   1,530.5
Current portion of pension and
 postretirement benefit
 obligations....................      65.8     68.0     65.5      68.0      65.4
Long-term pension and
 postretirement benefit
 obligations
 (excluding current portion)....   1,596.2  1,560.7  1,392.1   1,392.0   1,411.6
Preferred stock.................     130.4    130.4    130.4     130.4     130.4
Stockholders equity.............  $  864.3 $  981.1 $1,234.4 $ 1,111.4 $ 1.277.3
<CAPTION>
                                                             Three Months Ended
                                   Years Ended December 31,       March 31,
                                  -------------------------- -------------------
                                    1996     1997     1998     1998      1999
                                  -------- -------- -------- --------- ---------
<S>                               <C>      <C>      <C>      <C>       <C>
Other Data--
Ratio of earnings to combined
 fixed charges(3)...............    2.8x     2.6x     2.5x     2.3x      1.9x
</TABLE>
- --------

(1) On November 17, 1997, AK Holding effected a two-for-one common stock split.
  Per share data for prior periods have been restated for this stock split.
(2) AK Holding has paid quarterly dividends on its common stock since November
  15, 1995. Dividends of $0.075 per share, on a post-split basis, were paid in
  each of the first three quarters of 1996. Dividends of $.10 per share, on a
  post-split basis, were paid in the fourth quarter of 1996 and each of the
  first three quarters of 1997. Beginning with the fourth quarter of 1997,
  quarterly dividends have been paid at the rate of $0.125 per share. Armco has
  not paid any dividends on its common stock since 1990. The payment of
  dividends on the common stock of AK Holding in the future will be determined
  by its board of directors and will depend on business conditions, AK
  Holding's financial condition and earnings and other factors.
(3) For the purpose of calculating the ratio of earnings to combined fixed
  charges, (a) earnings consist of income before income taxes, extraordinary
  items and effects of accounting changes, the distributed income of less than
  50%-owned affiliates, plus fixed charges and (b) combined fixed charges
  consist of interest, whether expensed or capitalized, and preferred stock
  dividends.

                                       16
<PAGE>

                                USE OF PROCEEDS

  This exchange offer does not involve the sale of securities for cash and,
accordingly, we will not receive any proceeds from the issuance of the new
notes in exchange for the old notes. The net proceeds from the sale of the old
notes were approximately $439.0 million, after deducting the discount to the
initial purchasers and other offering expenses that are payable by us. We used
these monies to finance the approximately $338.1 million cost of redeeming our
10 3/4% Senior Notes Due 2004 on April 1, 1999 and will use the balance for
general corporate purposes.

                                       17
<PAGE>

                                 CAPITALIZATION

  The following table sets forth the consolidated capitalization of AK Steel
Holding Corporation, including our company, at March 31, 1999 as adjusted to
give pro forma effect to the redemption on April 1, 1999 of our 10 3/4% Senior
Notes Due 2009. The information presented below should be read in conjunction
with the consolidated financial statements included in AK Steel Holding
Corporation's 1998 Annual Report on Form 10-K and its Quarterly Report on Form
10-Q for the three months ended March 31, 1999.

<TABLE>
<CAPTION>
                                                          As Adjusted
                                                         March 31, 1999
                                                        ------------------
                                                        (amounts in millions)
<S>                                                     <C>               <C>
Cash and short-term investments(1).....................    $       152.1
                                                           =============
Long-term debt(2):
  Senior Secured Notes Due 2004........................    $       250.0
  10 3/4% Senior Notes Due 2004........................              --
  9 1/8% Senior Notes Due 2006.........................            550.0
  7 7/8% Senior Notes Due 2009.........................            450.0
  Other(3).............................................             30.0
                                                           -------------
    Total long-term debt...............................          1,280.0
                                                           -------------
Stockholders' equity:
  Common stock--authorized 200,000,000 shares;
   64,132,912 shares issued; 59,267,105 shares
   outstanding.........................................              0.6
  Additional paid-in capital...........................            725.9
  Treasury stock--at cost--4,845,499 shares............            (88.2)
  Retained earnings....................................            302.6
                                                           -------------
    Total stockholders' equity.........................            940.9
                                                           -------------
      Total capitalization.............................    $     2,220.9
                                                           =============
</TABLE>
- --------
(1) Does not reflect the payment on April 1, 1999 of accrued interest on the 10
    3/4% Senior Notes Due 2004.
(2) At March 31, 1999, we had no short-term debt outstanding and no current
    obligations in respect of our long-term debt. We have a receivables
    purchase and servicing agreement with a group of banks providing for an
    aggregate financing commitment as of March 31, 1999 of $200.0 million,
    inclusive of letters of credit. At March 31, 1999, letters of credit
    aggregating $35.9 million were outstanding under this facility.
(3) Consists of tax-exempt industrial development bond obligations due in 2027,
    2028 and 2029.

                                       18
<PAGE>

                    DESCRIPTION OF OUTSTANDING INDEBTEDNESS

The Secured Notes

  We have outstanding a total of $250.0 million principal amount of our secured
notes. The secured notes bear interest at annual rates ranging from 8.48% to
9.05%, with a weighted average rate of 8.72%. The principal of the secured
notes is payable in four consecutive annual installments of $62.5 million
commencing in December 2001 with the final installment due in December 2004.
The secured notes are secured by a first priority lien on the continuous cold
mill and hot dip galvanizing line at our Rockport Works and a first mortgage on
the approximately three acres of land upon which those two components have been
constructed. The secured notes may be prepaid, in whole or in part, at any
time, at our option, at 100% of their principal amount plus a customary "make-
whole" premium equal to the excess, if any, of:

  (1) the discounted value of the remaining scheduled payments with respect
      to the principal amount of the secured notes to be prepaid, over

  (2) the principal amount of those secured notes.

If the secured notes were repaid in full on July 23, 1999, the amount of this
make-whole premium would have been $16.7 million.

  The secured notes are subject to the terms of a note purchase agreement
containing covenants substantially similar to those contained in the indenture
governing the old notes and new notes.

  In addition, the note purchase agreement requires that we maintain
consolidated net worth of not less than the sum of $500.0 million plus an
aggregate amount equal to 25% of consolidated net income for each completed
fiscal year beginning after December 31, 1996. We also must maintain a ratio of
consolidated debt to consolidated capitalization of not more than .65 to 1.00
through December 31, 2001 and .55 to 1.00 thereafter until repayment in full of
the secured notes. These financial covenants are based on specific definitions
of the foregoing financial terms, which are set forth in the note purchase
agreement. The secured notes are subject to events of default that are
substantially similar to those applicable to the notes.

The 9 1/8% Notes

  Our 9 1/8% Senior Notes Due 2006, of which $550.0 million aggregate principal
amount are outstanding, are non-callable prior to December 15, 2001.
Thereafter, the 9 1/8% notes are callable at our option at an initial
redemption price of 104.56% of their principal amount, declining annually
thereafter to 100% on and after December 15, 2004, together with accrued
interest to the redemption date. The 9 1/8% notes include change in control
repurchase provisions that are identical to those applicable to the old notes
and new notes and have the benefit of a guarantee by our parent company that is
identical to its guarantee of the old notes and new notes. The indenture
relating to the 9 1/8% notes contains covenants substantially similar to those
contained in the indenture governing the old notes and new notes. The 9 1/8%
notes also are subject to events of default that are identical to those
applicable to the old notes and new notes.

Accounts Receivable Facility

  A wholly-owned special purpose subsidiary of our company is party to a
receivables purchase and servicing agreement with a group of banks, providing
for an aggregate financing commitment from and after January 15, 1999 of $200.0
million, inclusive of letters of credit outstanding as of March 31, 1999 in the
aggregate amount of $35.9 million. The banks' commitments will expire December
31, 2003. This subsidiary purchases our accounts receivable from us. It funds
those

                                       19
<PAGE>

purchases with cash collections on the purchased accounts receivable and the
proceeds realized from selling interests in those accounts receivable to the
participating banks. We act as servicer of the accounts receivable, including
processing collections. At March 31, 1998, the participating banks had no
interests in any of our outstanding accounts receivable and our special purpose
subsidiary held a pool of eligible accounts receivable that was sufficient to
fully utilize the commitments of the banks.

                                       20
<PAGE>

                               THE EXCHANGE OFFER

Purpose and Effect of the Exchange Offer


  We sold the old notes on February 10, 1999 in a private placement. Therefore,
we did not register the old notes under the Securities Act. However, we entered
into the registration rights agreement for the benefit of the purchasers of the
old notes. That agreement requires that we file a registration statement under
the Securities Act with respect to an issue of new notes having terms that are
identical to those of the old notes and, upon the effectiveness of the
registration statement, offer to you the opportunity to exchange your old notes
for a like principal amount of the new notes. The new notes will be issued
without a restrictive legend and, except as set forth below, may be reoffered
and resold without restrictions or limitations under the Securities Act. After
we complete the exchange offer, our obligations under the registration rights
agreement will terminate, except as provided in the last paragraph of this
section. As a result of the timely filing and effectiveness of the registration
statement of which this prospectus is a part, assuming we complete the exchange
offer by September 8, 1999, the prospective increases in the interest rate on
the old notes that were provided for in the registration rights agreement will
not occur.

  Based on an interpretation by the staff of the SEC set forth in no-action
letters issued to third parties, if you are not our "affiliate" within the
meaning of Rule 405 under the Securities Act or a broker-dealer referred to in
the next paragraph, we believe that the new notes you receive in the exchange
offer may be offered for sale, sold and otherwise transferred by you, without
compliance with the registration and prospectus delivery provisions of the
Securities Act. This interpretation, however, is based on your representation
that:

    (1) the new notes you receive in the exchange offer will be acquired by
  you in the ordinary course of your business; and

    (2) you are not engaging in, do not intend to engage in, and have no
  arrangement or understanding with any other person to participate in, a
  distribution of those new notes.

  If you tender your old notes in the exchange offer for the purpose of
participating in a distribution of the new notes that you will receive, you
cannot rely on this interpretation by the staff of the SEC. Under those
circumstances, you must comply with the registration and prospectus delivery
requirements of the Securities Act in connection with a secondary resale
transaction. If you are a broker-dealer and receive new notes in the exchange
offer for your own account in exchange for old notes that you acquired as a
result of market-making or other trading activities, you must acknowledge that
you will deliver a prospectus meeting the requirements of the Securities Act in
connection with any resales of those new notes. See "Plan of Distribution."

  If, because of your particular circumstances, new notes that you received
cannot be freely resold by you or if you are not eligible to participate in the
exchange offer, you can elect, by indicating on the letter of transmittal and
providing additional required information, to have your old notes registered in
a "shelf" registration statement on an appropriate form pursuant to Rule 415
under the Securities Act. In the event that we are obligated to file a shelf
registration statement, we will be required to keep the shelf registration
statement effective for a period of two years or a shorter period that will
terminate when all of the old notes covered by the shelf registration statement
have been sold pursuant to the shelf registration statement. Other than as set
forth in this paragraph, you will not have the right to require us to register
your old notes under the Securities Act. See "--Procedures for Tendering."

                                       21
<PAGE>

Terms of the Exchange Offer

  Upon satisfaction or waiver of the conditions of the exchange offer set forth
in this prospectus and in the accompanying letter of transmittal, we will
accept all old notes that are validly tendered and not withdrawn prior to 5:00
p.m. New York City time, on the expiration date. After authentication of the
new notes by the trustee, we will issue and deliver $1,000 principal amount of
new notes in exchange for each $1,000 principal amount of outstanding old notes
accepted in the exchange offer. You may tender some or all of your old notes
pursuant to the exchange offer in denominations of $1,000 and integral
multiples of $1,000.

  By tendering old notes in exchange for new notes and by executing the letter
of transmittal, you will represent to us that:

    (1) you are not our affiliate, as defined under Rule 405 of the
  Securities Act,

    (2) any new notes that you receive in the exchange offer will be acquired
  by you in the ordinary course of your business, and

    (3) you have no intention to distribute, and have no arrangement or
  understanding with any person to participate in the distribution of, the
  new notes you acquire.

  The form and terms of the new notes are the same as those of the old notes,
except that the new notes to be issued in the exchange offer have been
registered under the Securities Act and will not bear legends restricting their
transfer. The new notes will be issued pursuant to, and entitled to the
benefits of, the same indenture that governs the old notes. The new notes and
the old notes will be deemed one issue of notes under that indenture.

  As of the date of this prospectus, $450,000,000 aggregate principal amount of
old notes is outstanding. In connection with the issuance of the old notes, we
arranged for the old notes to be issued and transferable in book-entry form
through the facilities of DTC, acting as a depositary. The new notes will also
be issuable and transferable in book-entry form through DTC.

  This prospectus, together with the accompanying letter of transmittal, is
initially being sent to all registered holders of the old notes as of the close
of business on     , 1999. The exchange offer is not conditioned upon any
minimum aggregate principal amount of old notes being tendered. However, the
exchange offer is subject to customary conditions which may be waived by us,
and to the terms and provisions of the registration rights agreement. See "--
Conditions to the Exchange Offer" for a detailed description of those
conditions.

  We will be deemed to have accepted validly tendered old notes when we have
given oral or written notice of our acceptance to the exchange agent. The
exchange agent will receive the new notes from us and deliver them to the
tendering holders.

  If we do not accept any tendered old notes for exchange because of an invalid
tender or because the conditions to the exchange offer have not been met,
certificates for any old notes that were not accepted will be returned, at our
cost, to the tendering holder as promptly as practicable after the expiration
date.

  You will not be required to pay brokerage commissions or fees or, subject to
the instructions in the letter of transmittal, transfer taxes with respect to
the exchange of your old notes pursuant to the exchange offer. We will pay all
charges and expenses, other than specified taxes, in connection with the
exchange offer.

                                       22
<PAGE>

Expiration Date; Extensions; Amendments

  The exchange offer will expire at 5:00 p.m., New York City time, on     ,
1999, unless we determine, in our sole discretion, to extend the exchange
offer, in which case it will expire at the later date and time to which it is
extended. We do not intend to extend the exchange offer, although we reserve
the right to do so. If we determine to extend the exchange offer, we do not
intend to extend it beyond     , 1999. If we extend the exchange offer, we will
give oral or written notice of the extension to the exchange agent and give
each registered holder notice by means of a press release or other public
announcement of any extension prior to 9:00 a.m., New York City time, on the
next business day after the scheduled expiration date.

  We also reserve the right, in our sole discretion,

    (1) to delay accepting any old notes or, if any of the conditions set
  forth below under "--Conditions" have not been satisfied or waived, to
  terminate the exchange offer or

    (2) to amend the terms of the exchange offer in any manner,

by giving oral or written notice of such delay, termination or amendment to the
exchange agent, and by complying with Rule 14e-1(d) under the Exchange Act to
the extent that rule applies.

  We acknowledge and undertake to comply with the provisions of Rule 14e-1(c)
under the Exchange Act, which requires us to pay the consideration offered, or
return the old notes surrendered for exchange, promptly after the termination
or withdrawal of the exchange offer. We will notify you as promptly as we can
of any extension, termination or amendment.

Interest on the New Notes

  Interest on the new notes will accrue from the last interest payment date on
which interest was paid on the old notes surrendered in exchange therefor or,
if no interest has been paid on the old notes, from February 10, 1999--the date
of original issuance of the old notes.

Procedures for Tendering

  Book-Entry Interests

  The old notes were issued as global securities in fully registered form
without interest coupons. Beneficial interests in the global securities, held
by direct or indirect participants in DTC, are shown on, and transfers of these
interests are effected only through, records maintained in book-entry form by
DTC with respect to its participants.

  If you hold your old notes in the form of book-entry interests and you wish
to tender your old notes for exchange pursuant to the exchange offer, you must
transmit to the exchange agent on or prior to the expiration date either:

    (1) a written or facsimile copy of a properly completed and duly executed
  letter of transmittal, including all other documents required by the letter
  of transmittal, to the exchange agent at the address set forth on the cover
  page of the letter of transmittal; or

    (2) a computer-generated message transmitted by means of DTC's Automated
  Tender Offer Program system and received by the exchange agent and forming
  a part of a confirmation of book-entry transfer, in which you acknowledge
  and agree to be bound by the terms of the letter of transmittal.

                                       23
<PAGE>

  In addition, in order to deliver old notes held in the form of book-entry
interests:

    (A) a timely confirmation of book-entry transfer of those notes into the
  exchange agent's account at DTC pursuant to the procedure for book-entry
  transfers described below under "--Book-Entry Transfer" must be received by
  the exchange agent prior to the expiration date; or

    (B) you must comply with the guaranteed delivery procedures described
  below.

  The method of delivery of old notes and the letter of transmittal and all
other required documents to the exchange agent is at your election and risk.
Instead of delivery by mail, we recommend that you use an overnight or hand
delivery service. In all cases, sufficient time should be allowed to assure
delivery to the exchange agent before the expiration date. You should not send
the letter of transmittal or old notes to us. You may request your broker,
dealer, commercial bank, trust company, or nominee to effect the above
transactions for you.

  Certificated Old Notes

  Only registered holders of certificated old notes may tender those notes in
the exchange offer. If your old notes are certificated notes and you wish to
tender those notes for exchange pursuant to the exchange offer, you must
transmit to the exchange agent on or prior to the expiration date, a written or
facsimile copy of a properly completed and duly executed letter of transmittal,
including all other required documents, to the address set forth below under
"--Exchange Agent." In addition, in order to validly tender your certificated
old notes:

    (1) the certificates representing your old notes must be received by the
  exchange agent prior to the expiration date or
    (2) you must comply with the guaranteed delivery procedures described
  below.

  Procedures Applicable to All Holders

  If you tender an old note and you do not withdraw the tender prior to the
expiration date, you will have made an agreement with us in accordance with the
terms and subject to the conditions set forth in this prospectus and in the
letter of transmittal.

  If your old notes are registered in the name of a broker, commercial bank,
trust company or other nominee and you wish to tender your notes, you should
contact the registered holder promptly and instruct the registered holder to
tender on your behalf. If you wish to tender on your own behalf, prior to
completing and executing the letter of transmittal and delivering your old
notes, you must either make appropriate arrangements to register ownership of
the old notes in your name or obtain a properly completed bond power from the
registered holder. The transfer of record ownership may take considerable time.

  Signatures on a letter of transmittal or a notice of withdrawal must be
guaranteed by an eligible institution unless:

    (A) old notes tendered in the exchange offer are tendered either

      (1) by a registered holder who has not completed the box entitled
    "Special Registration Instructions" or "Special Delivery Instructions"
    on the letter of transmittal or

      (2) for the account of an eligible institution; and

    (B) the box entitled "Special Registration Instructions" on the letter of
  transmittal has not been completed.

                                       24
<PAGE>

  If signatures on a letter of transmittal or a notice of withdrawal are
required to be guaranteed, the guarantee must be by a financial institution,
which includes most banks, savings and loan associations and brokerage houses,
that is a participant in the Securities Transfer Agents Medallion Program, the
New York Stock Exchange Medallion Program or the Stock Exchanges Medallion
Program.

  If the letter of transmittal is signed by a person other than you, your old
notes must be endorsed or accompanied by a properly completed bond power and
signed by you as your name appears on those old notes.

  If the letter of transmittal or any old notes or bond powers are signed by
trustees, executors, administrators, guardians, attorneys-in-fact, officers of
corporations, or others acting in a fiduciary or representative capacity, those
persons should so indicate when signing. Unless we waive this requirement, in
this instance you must submit with the letter of transmittal proper evidence
satisfactory to us of their authority to act on your behalf.

  We will determine, in our sole discretion, all questions regarding the
validity, form, eligibility, including time of receipt, acceptance and
withdrawal of tendered old notes. This determination will be final and binding.
We reserve the absolute right to reject any and all old notes not properly
tendered or any old notes our acceptance of which would, in the opinion of our
counsel, be unlawful. We also reserve the right to waive any defects,
irregularities or conditions of tender as to particular old notes. Our
interpretation of the terms and conditions of the exchange offer, including the
instructions in the letter of transmittal, will be final and binding on all
parties.

  You must cure any defects or irregularities in connection with tenders of
your old notes within the time period we will determine unless we waive that
defect or irregularity. Although we intend to notify you of defects or
irregularities with respect to your tender of old notes, neither we, the
exchange agent nor any other person will incur any liability for failure to
give this notification. Your tender will not be deemed to have been made and
your notes will be returned to you if:

    (1) you improperly tender your old notes;

    (2) you have not cured any defects or irregularities in your tender; and

    (3) we have not waived those defects, irregularities or improper tender.

The exchange agent will return your notes, unless otherwise provided in the
letter of transmittal, as soon as practicable following the expiration of the
exchange offer.

  In addition, we reserve the right in our sole discretion to:

    (1) purchase or make offers for, or offer new notes for, any old notes
  that remain outstanding subsequent to the expiration of the exchange offer;

    (2) terminate the exchange offer; and

    (3) to the extent permitted by applicable law, purchase notes in the open
  market, in privately negotiated transactions or otherwise.


                                       25
<PAGE>

  The terms of any of those purchases or offers may differ from the terms of
the exchange offer.

  In all cases, issuance of new notes for old notes that are accepted for
exchange in the exchange offer will be made only after timely receipt by the
exchange agent of certificates for your old notes or a timely book-entry
confirmation of your old notes into the exchange agent's account at DTC, a
properly completed and duly executed letter of transmittal, or a computer-
generated message instead of the letter of transmittal, and all other required
documents. If any tendered old notes are not accepted for any reason set forth
in the terms and conditions of the exchange offer or if old notes are submitted
for a greater principal amount than you desire to exchange, the unaccepted or
non-exchanged old notes, or old notes in substitution therefor, will be
returned without expense to you. In addition, in the case of old notes tendered
by book-entry transfer into the exchange agent's account at DTC pursuant to the
book-entry transfer procedures described below, the non-exchanged old notes
will be credited to your account maintained with DTC, as promptly as
practicable after the expiration or termination of the exchange offer.

  Guaranteed Delivery Procedures

  If you desire to tender your old notes and your old notes are not immediately
available or one of the situations described in the immediately preceding
paragraph occurs, you may tender if:

    (1) you tender through an eligible financial institution;

    (2) on or prior to 12:00 Midnight, New York City time, on the expiration
  date, the exchange agent receives from an eligible institution, a written
  or facsimile copy of a properly completed and duly executed letter of
  transmittal and notice of guaranteed delivery, substantially in the form
  provided by us; and

    (3) the certificated for all certificated old notes, in proper form for
  transfer, or a book-entry confirmation, and all other documents required by
  the letter of transmittal, are received by the exchange agent within three
  NYSE trading days after the date of execution of the notice of guaranteed
  delivery.

  The notice of guaranteed delivery may be sent by facsimile transmission, mail
or hand delivery. The notice of guaranteed delivery must set forth:

    (1) your name and address;

    (2) the amount of old notes you are tendering; and

    (3) a statement that your tender is being made by the notice of
  guaranteed delivery and that you guarantee that within three New York Stock
  Exchange trading days after the execution of the notice of guaranteed
  delivery, the eligible institution will deliver the following documents to
  the exchange agent:

      (A) the certificates for all certificated old notes being tendered,
    in proper form for transfer or a book-entry confirmation of tender;

      (B) a written or facsimile copy of the letter of transmittal, or a
    book-entry confirmation instead of the letter of transmittal; and

      (C) any of the documents required by the letter of transmittal.


                                       26
<PAGE>

Book-Entry Transfer

  The exchange agent will establish an account with respect to the book-entry
interests at DTC for purposes of the exchange offer promptly after the date of
this prospectus. You must deliver your book-entry interest by book-entry
transfer to the account maintained by the exchange agent at DTC. Any financial
institution that is a participant in DTC's systems may make book-entry delivery
of book-entry interests by causing DTC to transfer the book-entry interests
into the exchange agent's account at DTC in accordance with DTC's procedures
for transfer.

  If one of the following situations occur:

    (1) you cannot deliver a book-entry confirmation of book-entry delivery
  of your book-entry interests into the exchange agent's account at DTC; or

    (2) you cannot deliver all other documents required by the letter of
  transmittal to the exchange agent prior to the expiration date,

then you must tender your book-entry interests according to the guaranteed
delivery procedures discussed above.

Withdrawal Rights

  You may withdraw tenders of your old notes at any time prior to 5:00 p.m.,
New York City time, on the expiration date.

  For your withdrawal to be effective, the exchange agent must receive a
written or facsimile transmission notice of withdrawal at its address set forth
below under "--Exchange Agent" prior to 5:00 p.m., New York City time, on the
expiration date.

  The notice of withdrawal must:

    (1) state your name;

    (2) identify the specific old notes to be withdrawn, including the
  certificate number or numbers and the principal amount of withdrawn notes;

    (3) be signed by you in the same manner as you signed the letter of
  transmittal when you tendered your old notes, including any required
  signature guarantees or be accompanied by documents of transfer sufficient
  for the exchange agent to register the transfer of the old notes into your
  name; and

    (4) specify the name in which the old notes are to be registered, if
  different from yours.

  We will determine all questions regarding the validity, form, and
eligibility, including time of receipt, of withdrawal notices. Our
determination will be final and binding on all parties. Any old notes withdrawn
will be deemed not to have been validly tendered for exchange for purposes of
the exchange offer. Any old notes which have been tendered for exchange but
which are not exchanged for any reason will be returned to you without cost as
soon as practicable after withdrawal, rejection of tender, or termination of
the exchange offer. Properly withdrawn old notes may be retendered by following
one of the procedures described under "--Procedures for Tendering" above at any
time on or prior to 5:00 p.m., New York City time, on the expiration date.

                                       27
<PAGE>

Conditions to the Exchange Offer

  Notwithstanding any other term of the exchange offer, we will not be required
to accept any old notes for exchange, or to exchange new notes for any old
notes, and we may terminate or amend the exchange offer before the acceptance
of the old notes if:

    (1) the exchange offer, or the making of any exchange by a holder,
  violates any applicable law or any applicable interpretation of the staff
  of the SEC, or

    (2) any action or proceeding is instituted or threatened in any court or
  by or before any governmental agency or body to enjoin or obtain damages in
  respect of the exchange offer, or that can reasonably be expected to impair
  our ability to proceed with the exchange offer.

If we determine that either of these events or circumstances has occurred or
exists, we may:

    (1) refuse to accept any old notes and return to the holders any old
  notes that have been tendered, or

    (2) extend the exchange offer and retain all old notes tendered prior to
  the original expiration date of the exchange offer, subject to the rights
  of the holders of those notes to withdraw them, or

    (3) waive the condition and accept all properly tendered old notes that
  have not been withdrawn.

  The exchange offer is not conditioned on any minimum aggregate principal
amount of old notes being tendered for exchange.

Exchange Agent

  Fifth Third Bank, the trustee under the indenture, has been appointed as
exchange agent for the exchange offer. In that capacity, the exchange agent has
no fiduciary duties and will be acting solely on the basis of our directions.
Questions, requests for assistance and requests for additional copies of this
prospectus, the letter of transmittal and other related documents should be
directed to the exchange agent addressed as follows:

<TABLE>
<S>  <C>
</TABLE>
  By registered or certified mail                Fifth Third Bank
  or by overnight courier:                     Attention: Geoff Clark
                                               Corporate Trust Operations
                                               ML 10AT66
                                               38 Fountain Square Plaza
                                               Cincinnati, Ohio 45263

  By hand delivery:                            Fifth Third Bank
                                               Attention: Geoff Clark
                                               Corporate Trust Operations
                                               580 Walnut Street - 4th Floor
                                               Cincinnati, Ohio 45202


  Facsimile transmission:                      (513) 744-8909

  Information or confirmation by telephone:    (513) 579-5320

  Delivery to an address or facsimile number other than those listed above will
not constitute a valid delivery.

                                       28
<PAGE>

Accounting Treatment

  The exchange notes will be recorded at the same carrying value as the old
notes, as reflected in our accounting records on the date of the exchange.
Accordingly, no gain or loss for accounting purposes will be recognized by our
company as a result of the consummation of the exchange offer. The expenses of
the exchange offer will be amortized by us over the remaining term of the notes
issued in the exchange offer.

Consequences of Failure to Exchange

  After we complete the exchange offer, if you have not tendered your old
notes, you will not have any further registration rights, except as set forth
above. Your old notes will continue to be subject to restrictions on transfer.
Therefore, the liquidity of the market for your old notes could be adversely
affected upon completion of the exchange offer if you do not participate in the
exchange offer. See the "Risk Factors" section of this prospectus under the
heading "The liquidity of any market for the old notes could be adversely
affected after completion of the exchange offer."

                                       29
<PAGE>

                            DESCRIPTION OF NEW NOTES

  You can find the definitions of terms used in this description under the
subheading "Defined Terms." In this section, the words "we," "our," "our
company" and "us" refer only to AK Steel Corporation, as a separate entity, and
do not include our parent company, AK Steel Holding Corporation, or any of our
subsidiaries. For convenience, and to more readily distinguish it from AK
Steel, we refer to AK Steel Holding Corporation in this description of the
notes as "AK Holding."

  We will issue the new notes under the indenture we entered into with Fifth
Third Bank, as trustee in connection with the issuance of the old notes. A copy
of the indenture has been filed as an exhibit to the registration statement of
which this prospectus is a part. The terms of the new notes include those
stated in the indenture and those made part of the indenture by reference to
the Trust Indenture Act of 1939.

  The following description of the notes is only a summary of the material
provisions of the indenture as currently in effect. We urge you to read the
indenture because that document, and not this description, defines your rights
as holders of the notes. You may obtain a copy of the indenture by following
the procedures set forth under "Where You Can Find More Information."

  On July 19, 1999, we began soliciting consents from the holders of the notes
to proposed amendments to the indenture governing the notes. The proposed
amendments are intended to facilitate the orderly conduct of our business, as
well as the continued regular payment of dividends by AK Holdings, following
the Armco merger. The material terms of the proposed amendments are summarized
at the end of this description of the notes.

  Any reference to "notes" in this section refers to both old notes and new
notes, unless the context otherwise requires.

Brief Description of the New Notes and the AK Holding Guarantee

  The new notes:
    .  are our senior unsecured obligations;
    .  rank equally in right of payment with all of our senior unsecured
       debt;
    .  rank senior in right of payment to all of our subordinated debt;
    .  are effectively junior to all of our secured obligations, including
       the $250.0 million of our outstanding senior secured notes, to the
       extent of the collateral securing those obligations; and
    .  are unconditionally guaranteed by our parent company, AK Holding.

  The AK Holding guarantee:
    .  is a senior unsecured obligation of AK Holding;
    .  ranks equally in right of payment with all of AK Holding's senior
       unsecured debt;
    .  ranks senior in right of payment to all of AK Holding's subordinated
       debt; and
    .  is effectively junior to all of its secured obligations, to the
       extent of the collateral securing those obligations.

  At March 31, 1999, after giving pro forma effect to the redemption on April
1, 1999 of our outstanding 10 3/4% Senior Notes Due 2004, the aggregate
principal amount of our outstanding senior debt was approximately $1.28
billion, of which $250.0 million was secured. All but $30 million of

                                       30
<PAGE>

our senior debt is guaranteed by AK Holding. In addition, upon consummation of
the merger, we will assume approximately $225.0 million of Armco indebtedness
under the Armco senior notes.

Principal, Maturity and Interest

  We will issue new notes with a maximum aggregate principal amount of $450
million in denominations of $1,000 and any integral multiple of $1,000. The
notes will mature on February 15, 2009.

  Interest on the new notes will accrue at the rate of 7 7/8% per annum and
will be payable semi-annually on February 15 and August 15 of each year,
commencing on August 15, 1999. We will make each interest payment to the
holders of record of the notes on the immediately preceding February 1 and
August 1.

  Interest on the new notes will accrue from February 10, 1999 or, if interest
has already been paid, from the date it was most recently paid. If you tender
your old notes and they are accepted for exchange, you will receive accrued
interest on your old notes to, but not including, the date of issuance of the
new notes. This interest will be payable with the first interest payment on the
new notes and you will not receive any payment in respect of interest on your
old notes accrued after the issuance of your new notes. Interest will be
computed on the basis of a 360-day year comprised of twelve 30-day months.

Optional Redemption

  Except as set forth below, we will not be entitled to redeem the new notes at
our option prior to February 15, 2004.

  The new notes will be redeemable at our option, at any time on or after
February 15, 2004 as a whole or from time to time in part, upon not less than
30 nor more than 60 days' notice mailed to each holder of new notes to be
redeemed at the holder's address appearing in the register, at the following
redemption prices expressed as percentages of principal amount, if redeemed
during the 12-month period beginning February 15 of the years indicated below:

<TABLE>
<CAPTION>
                                                                      Redemption
       Year                                                             Price
       ----                                                           ----------
       <S>                                                            <C>
       2004..........................................................  103.938%
       2005..........................................................  102.625%
       2006..........................................................  101.313%
       2007 and thereafter...........................................  100.000%
</TABLE>

together in the case of any such redemption with accrued interest, if any, to
the redemption date.

  In addition, at any time and on more than one occasion prior to February 15,
2002, we may redeem up to $157.5 million aggregate principal amount of the
outstanding notes with the proceeds of one or more Public Equity Offerings, at
a redemption price of 107.875% of the principal amount of the notes redeemed
plus accrued interest to the redemption date, provided that:

  (1) at least $292.5 million aggregate principal amount of the notes remains
      outstanding immediately after each redemption, other than notes held,
      directly or indirectly, by us or our affiliates; and

  (2) each redemption occurs within 60 days after the completion of the
      related Public Equity Offering.

                                       31
<PAGE>

  If less than all of the outstanding notes are to be redeemed, the notes will
be chosen for redemption by the trustee and the depository on a pro rata basis
or by lot or by a method that complies with applicable legal requirements and
stock exchange rules.

Change in Control Offer

  If a Change of Control occurs, you will have the right to require us to
repurchase all or any part, equal to $1,000 or an integral multiple of $1,000,
of your notes on the date specified in the Change of Control notice, which may
not be earlier than 45 days nor latter than 60 days from the date the Change of
Control notice is mailed or required to be mailed. In the Change of Control
offer, we will offer cash equal to 101% of the aggregate principal amount of
notes repurchased plus accrued and unpaid interest on the repurchased notes, if
any, to the payment date. Within 30 days following any Change of Control, we
will mail a notice to you describing the transaction or transactions that
constitute the Change of Control and offering to repurchase notes on the
payment date specified in the Change of Control notice. The procedures for this
purchase will be described in the notice. We will comply with all applicable
federal and state securities laws in connection with the repurchase of the
notes as a result of a Change of Control.

  If a Change in Control offer is made, there can be no assurance that we will
have funds sufficient to pay the purchase price for all the notes that might be
delivered by holders seeking to accept the Change in Control offer. See the
"Risk Factors" section of this prospectus under the heading "We are
substantially leveraged which could affect our ability to fulfill our
obligations under the notes." Our failure to repurchase notes in accordance
with this provision would constitute an event of default under the indenture.
See "--Events of Default."

Guarantees

  AK Holding will guarantee our payment and performance of the Obligations and
will pay all expenses, including fees and disbursements of counsel, paid or
incurred by the trustee or the holders of the notes in enforcing their rights
under that guarantee. The guarantee will be a senior unsecured obligation of AK
Holding and will rank equally with its other senior unsecured Debt.

  AK Holding's principal asset is the outstanding common stock of AK Steel, and
virtually all of AK Holding's operations are conducted through AK Steel. Under
the indenture, AK Holding has agreed not to engage in any activities other than
owning outstanding securities of AK Steel as well as those activities
incidental to its status as a public company, and not to incur any liabilities
other than those relating to its guarantee of the notes and certain other
indebtedness of AK Steel as well as those liabilities incidental to its status
as a public company. See "--Material Covenants--Restrictions on Activities of
AK Holding."

  At present, none of AK Steel's operations is conducted through subsidiaries
and, therefore, none of AK Steel's existing subsidiaries is a guarantor of the
notes. Under the indenture as currently in effect, if in the future any
operations of AK Steel were conducted through a subsidiary, other than a Non-
Recourse Subsidiary, that subsidiary would be required to guarantee the payment
and performance of the Obligations on the same terms as, and on a basis that is
joint and several with, AK Holding's guarantee. Upon consummation of the
merger, Armco's subsidiaries will become subsidiaries of AK Steel and, unless
classified as Non-Recourse Subsidiaries, would be required to guarantee the
notes. However, all but one of Armco's existing subsidiaries would be excluded
from the obligation to guarantee the notes if the proposed amendments to the
indenture became effective.

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<PAGE>

See "--The Proposed Amendments--Definition of Non-Recourse Subsidiary and
Guarantor Subsidiary."

  Claims of creditors of AK Steel's subsidiaries, including trade creditors,
will have priority over creditors and equity holders of AK Steel, including
holders of the notes. Although holders of the notes will be direct creditors of
any subsidiary that guarantees the notes by virtue of that guarantee, existing
or future creditors of that subsidiary could attempt to avoid or subordinate
guarantees of the notes, in whole or in part, under fraudulent conveyance laws.
To the extent any subsidiary's guarantee is avoided as a fraudulent conveyance
or held unenforceable for any other reason, the holders of the notes would
cease to be creditors of that subsidiary and would be solely creditors of AK
Steel and of any other Guarantor Subsidiary whose guarantee was not voided or
held unenforceable. Similarly, the notes will be effectively subordinated to
the creditors of AK Steel's subsidiaries to the extent those subsidiaries are
not Guarantor Subsidiaries.

Form of New Notes

  The certificates representing the new notes will be issued in fully
registered form, without coupons. Except as described in the next paragraph,
the new notes will be deposited with, or on behalf of, DTC, and registered in
the name of Cede & Co., as DTC's nominee in the form of a global note. Holders
of the new notes will own book-entry interests in the global note evidenced by
records maintained by DTC.

  Book-entry interests may be exchange for certificated notes of like tenor and
equal aggregate principal amount, if

    (1) DTC notifies us that it is unwilling or unable to continue as
  depositary for the global securities or DTC at any time ceases to be a
  clearing agency registered under the Exchange Act,

    (2) we determine that the book-entry interests will no longer be
  represented by global notes and we execute and deliver to the trustee
  instructions to that effect or

    (3) a default has occurred that entitles the holders of the notes to
  accelerate their maturity and that default is continuing.

  As of the date of this prospectus, no certificated notes are issued and
outstanding.

Material Covenants

  The indenture contains the following material covenants:

  Commission Reports. Even if AK Holding ceases to be subject to the reporting
requirements of Section 13 of the Exchange Act, AK Holding must continue to
file with the SEC and provide the trustee and holders of the notes with the
same reports, information and other documents as are specified in Section 13 of
the Exchange Act.

  Limitation on Liens. The indenture provides that we shall not, and shall not
permit any of our subsidiaries to, create or permit to exist any lien upon any
of their respective property or assets, now owned or subsequently acquired,
securing any obligation unless concurrently with the creation of the lien
effective provision is made to secure the notes equally and ratably with that
obligation for so long as the obligation is subject to the lien. Any lien
securing subordinated Debt must

    (1) be subordinated and junior to the lien securing the notes and

                                       33
<PAGE>

    (2) have the same or lesser relative priority as the subordinated Debt
  shall have with respect to the notes.

The preceding restrictions shall not require us or any of our subsidiaries to
equally and ratably secure the notes if the lien consists of the following:

    (1) liens created by the indenture, liens existing as of the date on
  which the old notes were originally issued and liens to secure Debt in
  respect of our outstanding secured notes as described under "Description of
  Outstanding Indebtedness--The Secured Notes";

    (2) Permitted Liens;

    (3) liens to secure Debt issued by us for the purpose of financing all or
  a part of the purchase price of assets or property acquired or constructed
  after the date on which the old notes were originally issued, provided that

      (a) the aggregate principal amount or accreted value of Debt issued
    does not exceed the lesser of cost or fair market value, as determined
    in good faith by the board of directors of AK Holding, of the assets or
    property that are acquired or constructed,

      (b) either

             (x) the liens secure Debt permitted by clause (5) under the
           "Limitation on Debt" covenant or

             (y) the liens secure additional Debt which, at the time of
           determination on a pro forma basis, would not exceed, in the case
           of Normal Replacement Assets, 50%, or in the case of Special
           Assets, 100%, of the aggregate principal amount of Debt permitted
           at such time under the Consolidated EBITDA Coverage Ratio as set
           forth in the first paragraph of the "Limitation on Debt" covenant
           at an interest rate equal to the rate of interest on the additional
           Debt to be secured by the liens,

      (c) the liens do not encumber any other assets or property of our
    company or any of its subsidiaries other than the assets or property
    that are acquired or constructed or any improvement on those assets or
    property and

      (d) the liens attach to the assets or property within 90 days of the
    construction or acquisition of the assets or property;

    (4) liens on the assets or property of a subsidiary of our company
  existing at the time the subsidiary became a subsidiary, provided that the
  liens

      (a) were not issued as a result of, or in connection with or in
    anticipation of, the subsidiary becoming a subsidiary of our company,
    and

      (b) do not extend to or cover any other property or assets of our
    company or any of its other subsidiaries;

    (5) liens on the Inventory or accounts receivable of our company or any
  Significant Subsidiary that is a Guarantor Subsidiary securing Debt under
  any Permitted Credit Facility; provided that any lien on Intangible
  Property limits the rights of the holder of that lien to the use of the
  Intangible Property to manufacture, process and sell the Inventory with
  respect to which such holder has a lien;

                                       34
<PAGE>

    (6) liens securing industrial revenue or pollution control bonds issued
  by us, provided that

      (a) the aggregate principal amount of Debt secured by the liens does
    not exceed the lesser of cost or fair market value, as determined in
    good faith by the board of directors of AK Holding, of the assets or
    property financed by that Debt, and

      (b) the liens do not encumber any other property or assets of our
    company or any of its subsidiaries;

    (7) liens securing Debt issued to refinance Debt which has been secured
  by a lien permitted under the indenture and is permitted to be refinanced
  under the indenture, provided that the liens do not extend to or cover any
  property or assets of our company or any of its subsidiaries not securing
  the Debt that is refinanced, and the principal amount or accreted value of
  the Debt so secured is not increased except as otherwise permitted pursuant
  to the indenture;

    (8) liens on the Equity Interests, assets or property of a Non-Recourse
  Subsidiary securing Non-Recourse Debt; or

    (9) liens securing Debt which, together with all other Debt secured by
  liens, excluding Debt secured by liens permitted by clauses (1) through (8)
  above, at the time of determination do not exceed the greater of

      (x) $100.0 million and

      (y) 5% of Consolidated Net Tangible Assets of AK Holding, in each
    case, at any one time outstanding;

  provided that the Attributable Debt in connection with sale/leaseback
  transactions permitted under clause (3) of the "Limitation on
  Sale/Leaseback Transactions" covenant will be included in the determination
  and treated as Debt secured by a lien not otherwise permitted by clauses
  (1) through (8) above.

  For the avoidance of ambiguity, it is understood that liens referred to in
clauses (1) through (9) of this covenant description may secure, in addition to
the principal of and premium, if any, on Debt referred to in those clauses,
interest and all other obligations on and in respect of that Debt.

  Limitation on Sale/Leaseback Transactions. The indenture provides that we
shall not, and shall not permit any of our subsidiaries to, enter into,
guarantee or otherwise become liable with respect to any sale/leaseback
transaction unless at least one of the following conditions is satisfied:

    (1) the lease is between our company and a Wholly Owned Guarantor
  Subsidiary, or between Wholly Owned Guarantor Subsidiaries, provided that
  the provisions of this clause (1) shall no longer be applicable to that
  lease and the lease shall be deemed for purposes of this paragraph to
  constitute the entering into of a sale/leaseback transaction by the parties
  to the lease upon either

      (a) the transfer or other disposition by the Wholly Owned Guarantor
    Subsidiary of the lease to a person other than our company or another
    Wholly Owned Guarantor Subsidiary or

      (b) the issuance, sale, lease, transfer or other disposition of
    Equity Interests, including by consolidation or merger, of the Wholly
    Owned Guarantor Subsidiary to a person other than our company or
    another Wholly Owned Guarantor Subsidiary;

    (2) clauses (2) through (8) of the "Limitation on Liens" covenant would
  permit the creation of a lien on the property to secure Debt in an amount
  at least equal to the Attributable

                                       35
<PAGE>

  Debt in respect of the sale/leaseback transaction and our company or its
  subsidiary receives consideration at least equal to the fair market value,
  as determined in good faith by the board of directors of AK Holding, of the
  property transferred;

    (3) clause (9) of the "Limitation on Liens" covenant would permit the
  creation of a lien on the property to secure Debt at least equal to the
  Attributable Debt in respect of that sale/leaseback transaction and our
  company or subsidiary receives consideration at least equal to the fair
  market value, as determined in good faith by the board of directors of AK
  Holding, of the property transferred; or

    (4) the sale/leaseback transaction is treated as an Asset Disposition and
  all the conditions of the "Limitation on Sales of Assets and Equity
  Interests of Subsidiaries" covenant are satisfied with respect to that
  sale/leaseback transaction, without giving effect to the exceptions for Net
  Available Cash in amounts less than $25.0 million or $10.0 million, as set
  forth in the last paragraph of the "Limitation on Sales of Assets and
  Equity Interests of Subsidiaries" covenant.

  Limitation on Debt. The indenture provides that we shall not issue, directly
or indirectly, any Debt unless, immediately after giving effect to the issuance
of the Debt and the receipt and application of the proceeds of that Debt, the
pro forma Consolidated EBITDA Coverage Ratio would be greater than 2.5 to 1.0.

  Notwithstanding the foregoing limitation, we may issue the following Debt:

    (1) Debt issued by us pursuant to Permitted Credit Facilities and
  guarantees by our company of obligations in respect of bonds or notes, in
  an aggregate principal amount not exceeding $60.0 million, payable solely
  from the proceeds of (a) taxes payable by us on real or depreciable
  personal property relating to the Rockport Works or (b) charges payable by
  us for sewer and water services relating to the Rockport Works and, to the
  extent that the taxes or charges are insufficient to make those payments,
  payments under the guarantees by our company; provided that the payments
  under the bonds or notes or the guarantees are not required to be prefunded
  by more than an aggregate amount equal to one year of debt service on those
  bonds or notes and are not subject to acceleration by the express terms of
  the bonds, notes or guarantees or otherwise;

    (2) Debt issued by us owed to and held by a Wholly Owned Subsidiary;
  provided that any subsequent issuance or transfer of any Equity Interests
  that results in the Wholly Owned Subsidiary ceasing to be a Wholly Owned
  Subsidiary or any transfer of that Debt, other than to another Wholly Owned
  Subsidiary, shall be deemed, in each case, to constitute the issuance of
  that Debt by us;

    (3) The notes;

    (4) Debt outstanding on the date on which the old notes were originally
  issued, other than Debt described in clauses (1) or (2) of this covenant
  description;

    (5) Debt issued by us, whether or not secured by a lien, constituting all
  or a part of the purchase price of assets or property acquired or
  constructed after the date on which the old notes were originally issued;
  provided that Debt issued under this clause (5) in any calendar year shall
  not exceed in aggregate principal amount the sum of

      (a) $50.0 million for each of 1999, 2000 and 2001, and $35.0 million
    for each calendar year from and including 2002 to and including 2008
    plus

                                       36
<PAGE>

      (b) the excess of the aggregate principal amount otherwise permitted
    to be issued under this clause (5) in all previous calendar years to
    and including the calendar year in which the old notes were originally
    issued less

      (c) the aggregate principal amount actually issued by us during that
    period under this clause (5);

    (6) Refinancing Debt in respect of any Debt permitted pursuant to the
  first paragraph of this covenant description or any Debt permitted pursuant
  to clause (3), (4) or (5) of this covenant description or this clause (6);

    (7) Obligations of our company pursuant to

      (a) interest rate swap or similar agreements designed to protect our
    company against fluctuations in interest rates in respect of our Debt
    to the extent the notional principal amount of that obligation does not
    exceed the aggregate principal amount of the Debt to which the interest
    rate contracts relate, and

      (b) foreign exchange or commodity hedge, exchange or similar
    agreements designed to protect our company against fluctuations in
    foreign currency exchange rates or commodity prices in respect of
    foreign exchange or commodity exposures incurred by us in the ordinary
    course of our business; or

    (8) Debt that is not otherwise permitted to be issued pursuant to clauses
  (1) through (7) of this covenant description in an aggregate principal
  amount which, together with (a) any other outstanding Debt issued by us
  pursuant to this clause (8) and (b) Debt issued and Preferred Equity
  Interests then outstanding and issued by our subsidiaries pursuant to
  clause (8) of the "Limitation on Debt and Preferred Equity Interests of
  Subsidiaries" covenant, does not exceed $100.0 million at any one time
  outstanding.

  Notwithstanding the foregoing, we may not issue any Refinancing Debt in
respect of subordinated Debt unless the Refinancing Debt is subordinated to the
notes to at least the same extent as the subordinated Debt.

  Limitation on Debt and Preferred Equity Interests of Subsidiaries. The
indenture provides that we shall not permit any of our subsidiaries to issue,
directly or indirectly, any Debt or Preferred Equity Interests except:

    (1) Debt or Preferred Equity Interests issued to and held by us or a
  Wholly Owned Subsidiary; provided that (a) any subsequent issuance or
  transfer of any Equity Interests that results in any such Wholly Owned
  Subsidiary ceasing to be a Wholly Owned Subsidiary or (b) any subsequent
  transfer of the Debt or Preferred Equity Interests, other than to our
  company or a Wholly Owned Subsidiary, shall be deemed, in each case, to
  constitute the issuance of those Debt or Preferred Equity Interests by the
  person that issued them;

    (2) Debt or Preferred Equity Interests, other than any described in
  clause (1) above, outstanding on the date on which the old notes were
  originally issued;

    (3) Debt or Preferred Equity Interests of a subsidiary of our company
  issued and outstanding on or prior to the date on which the subsidiary
  became our subsidiary, other than Debt or Preferred Equity Interests issued
  as consideration in, or to provide all or any portion of

                                       37
<PAGE>

  the funds or credit support utilized to consummate, the transaction or
  series of related transactions pursuant to which the subsidiary became our
  subsidiary;

    (4) Debt or Preferred Equity Interests issued to refinance Debt or
  Preferred Equity Interests referred to in clause (2) or (3) of this
  covenant description; provided that the Debt or Preferred Equity Interests
  that are issued

      (a) are in a principal amount, or have a liquidation value, that does
    not exceed the principal amount of, and premiums, if any, and accrued
    interest, or the liquidation value and premiums, if any, and
    accumulated dividends, with respect to the Debt or Preferred Equity
    Interests that are refinanced by application of the net proceeds of the
    Debt or Preferred Equity Interests so issued and reasonable fees,
    expenses, commissions and costs incurred in connection with the
    issuance of the Debt or Preferred Equity Interests and

      (b) have a stated maturity later than the stated maturity of the Debt
    or Preferred Equity Interests being refinanced and

      (c)  have an Average Life equal to or greater than the remaining
    Average Life of the Debt or Preferred Equity Interests being
    refinanced;

    (5) Non-Recourse Debt or Preferred Equity Interests of a Non-Recourse
  Subsidiary issued after the date on which the old notes were originally
  issued; provided that if the Debt or Preferred Equity Interests
  subsequently ceases to be Non-Recourse Debt or Preferred Equity Interests
  of a Non-Recourse Subsidiary, then that event will be deemed to constitute
  the issuance of the Debt or Preferred Equity Interests by the issuer
  thereof;

    (6) Guarantees of the notes or Refinancing Debt in respect of Debt
  permitted under clause (3) of the "Limitation on Debt" covenant;

    (7) Guarantees issued by any Guarantor Subsidiary of any Debt issued by
  our company as permitted under the "Limitation on Debt" covenant; or

    (8) Debt or Preferred Equity Interests not otherwise permitted to be
  issued pursuant to clauses (1) through (7) above, which, together with (a)
  any other outstanding Debt or Preferred Equity Interests issued pursuant to
  this clause (8) and (b) Debt issued by us pursuant to clause (8) under the
  "Limitation on Debt" covenant, does not exceed $60.0 million at any one
  time outstanding.

  Limitation on Restricted Payments. The indenture provides that AK Holding
shall not, and shall not permit any of its subsidiaries to, directly or
indirectly:

    (1) declare or pay any dividend or make any distribution on or in respect
  of, or make any distribution to the holders of, Equity Interests of AK
  Holding except

      (a) dividends or distributions payable solely in its Non-Convertible
    Equity Interests or in options, warrants or other rights to acquire its
    Non-Convertible Equity Interests and

      (b) dividends or distributions payable to a Wholly Owned Guarantor
    Subsidiary;

    (2) purchase, redeem or otherwise acquire or retire for value any Equity
  Interests of AK Holding;

    (3) (a) declare or pay any dividend or make any distribution on or in
  respect of, or make any distribution to holders of, Equity Interests of any
  subsidiary of AK Holding, other than with respect to any Equity Interests
  held by our company, AK Holding, any Wholly Owned

                                       38
<PAGE>

  Guarantor Subsidiary or any Wholly Owned Non-Recourse Subsidiary or (b)
  purchase, redeem or otherwise acquire or retire for value any Equity
  Interests of any subsidiary of AK Holding, other than those Equity
  Interests held by our company, AK Holding, any Wholly Owned Guarantor
  Subsidiary or any Wholly Owned Non-Recourse Subsidiary;

    (4) purchase, repurchase, redeem, defease or otherwise acquire or retire
  for value, prior to scheduled maturity, scheduled repayment or scheduled
  sinking fund payment, any subordinated Debt--other than the purchase,
  repurchase or other acquisition of subordinated Debt purchased in
  anticipation of satisfying a sinking fund obligation, principal installment
  or final maturity, in each case due within one year of the date of
  acquisition; or

    (5) make any Investment other than Permitted Investments (any such
  dividend, distribution, purchase, redemption, repurchase, defeasance, other
  acquisition, retirement or Investment being herein referred to as a
  "Restricted Payment") if:

      (a) a default or event of default shall have occurred and be
    continuing or would result from the Restricted Payment;

      (b) upon giving effect to the Restricted Payment, on a pro forma
    basis, we are not able to issue an additional $1.00 of Debt pursuant to
    the Consolidated EBITDA Coverage Ratio as set forth in the first
    paragraph of the "Limitation on Debt" covenant; or

      (c) upon giving effect to the Restricted Payment, the aggregate
    amount of that Restricted Payment and all other Restricted Payments
    since October 1, 1996 would exceed the sum of:

             (A) 50% of the Consolidated Net Income of AK Holding accrued
           during the period, treated as one accounting period, from October
           1, 1996 through the last full fiscal quarter for which quarterly or
           annual financial statements are available prior to the date of the
           Restricted Payment or, in case Consolidated Net Income shall be a
           deficit, minus 100% of that deficit, plus

             (B) the aggregate Net Cash Proceeds received by us from the issue
           or sale of our Equity Interests, other than Redeemable Equity
           Interests or Exchangeable Equity Interests, subsequent to October
           1, 1996, other than to a subsidiary of our company or an employee
           stock ownership plan or similar trust, plus

             (C) the aggregate Net Cash Proceeds received by us from the issue
           or sale of our Equity Interests, other than Redeemable Equity
           Interests or Exchangeable Equity Interests, to an employee stock
           ownership plan subsequent to October 1, 1996, but, if the employee
           stock ownership plan issues any Debt, only to the extent that the
           proceeds are equal to any increase in the Consolidated Net Worth of
           AK Holding resulting from principal repayments made by the employee
           stock ownership plan with respect to Debt issued by it to finance
           the purchase of such Equity Interests, plus

             (D) the amount by which consolidated Debt of our company is
           reduced on AK Holding's balance sheet upon the conversion or
           exchange, other than by a subsidiary of our company, subsequent to
           October 1, 1996, of any Debt of our company or any of its
           subsidiaries convertible or exchangeable for Equity Interests of
           our company, other than Redeemable Equity Interests or Exchangeable
           Equity Interests, less the amount of any cash, or other property,
           distributed by us or any of our subsidiaries upon such conversion
           or exchange.


                                       39
<PAGE>

  So long as no default or event of default has occurred that is continuing or
would result from the Restricted Payment, the foregoing limitations on
Restricted Payments will not prohibit:

    (1) any purchase or redemption of Equity Interests of AK Holding or
  subordinated Debt made by exchange for, or out of the proceeds of the
  substantially concurrent sale of, Equity Interests of AK Holding, other
  than Redeemable Equity Interests or Exchangeable Equity Interests and other
  than Equity Interests issued or sold to a subsidiary of our company or an
  employee stock ownership plan; provided that

      (a) the purchase or redemption shall be excluded in the calculation
    of the amount of Restricted Payments and

      (b) the Net Cash Proceeds from the sale shall be excluded from
    clauses (c)(B) and (c)(C) of the preceding paragraph;

    (2) any purchase or redemption of subordinated Debt, other than
  Redeemable Equity Interests, made by exchange for, or out of the proceeds
  of the substantially concurrent sale of, Debt of our company other than to
  our subsidiaries; provided that

      (a) the Debt is subordinated to the notes to at least the same extent
    as the Subordinated Obligations that are exchanged, purchased or
    redeemed,

      (b) the Debt has a stated maturity later than the stated maturity of
    the notes,

      (c) the Debt has an Average Life greater than the remaining Average
    Life of the notes and

      (d) the purchase or redemption shall be excluded in the calculation
    of the amount of Restricted Payments;

    (3) any purchase or redemption of subordinated Debt from Net Available
  Cash to the extent permitted under the "Limitation on Sales of Assets and
  Equity Interests of Subsidiaries" covenant; provided that the purchase or
  redemption shall be excluded in the calculation of the amount of Restricted
  Payments;

    (4) dividends paid within 60 days after the date of declaration if at the
  time the dividend was declared the dividend would have complied with this
  provision; provided that

      (a) at the time of payment of the dividend, no default or event of
    default shall have occurred and be continuing or would result from the
    payment of the dividend and

      (b)  the dividend shall be included in the calculation of the amount
    of Restricted Payments;

    (5) any repurchase by AK Holding of employee stock granted under an
  employee stock option plan; provided that

      (a) the aggregate amount of repurchases in any calendar year shall
    not exceed $1.0 million per employee,

      (b) the aggregate amount of all repurchases in any calendar year
    shall not exceed $5.0 million--it being understood that the excess of
    any such amounts permitted to be expended under clause (5)(a) above and
    this clause (5)(b) during any calendar year over the amount actually
    expended during that period shall not be carried forward, and

      (c) the repurchases shall be included in the calculation of the
    amount of Restricted Payments;

                                       40
<PAGE>

    (6) any purchase, repurchase, redemption, defeasance or other acquisition
  by any Non-Recourse Subsidiary of Non-Recourse Debt of that Non-Recourse
  Subsidiary; provided that the amount of that purchase, repurchase,
  redemption, defeasance or other acquisition shall be excluded in the
  calculation of the amount of Restricted Payments.

  If none of the conditions described above in clauses (5)(a) and (b) of the
first sentence of this covenant description exist, the foregoing limitations on
Restricted Payments will not prohibit the declaration and payment of one or
more dividends on or before February 28, 2001 in an aggregate amount not to
exceed $50.0 million; provided that all of those dividends shall be excluded in
the calculation of the amount of Restricted Payments.

  Limitation on Issuance and Sale of Equity Interests of Subsidiaries. The
indenture provides that we shall not permit any of our subsidiaries to issue or
sell any Equity Interests to any person, or permit any person in either case,
other than our company and its subsidiaries, to own or hold an interest, other
than any interest owned or held on the date on which the notes were originally
issued by a person other than our company and its subsidiaries, in any Equity
Interests of any of our subsidiaries, other than a Non-Recourse Subsidiary or a
JV Subsidiary; provided that the foregoing limitation shall not apply to

    (1) the sale of all but not less than all of the Equity Interests of any
  of our subsidiaries made in accordance with the "Limitation on Sales of
  Assets and Equity Interests of Subsidiaries" covenant,

    (2) issuances of Preferred Equity Interests permitted pursuant to clauses
  (3), (5) and (7) under the "Limitation on Debt and Preferred Equity
  Interests of Subsidiaries" covenant and

    (3) the ownership or holding of an interest by any person, other than our
  company and its subsidiaries, in any Equity Interests of any of our
  subsidiaries issued pursuant to clause (2) above.

  Limitation on Restrictions on Distributions from Subsidiaries. The indenture
provides that we shall not, and shall not permit any of our subsidiaries to,
create or permit to exist or become effective any consensual encumbrance or
restriction on the ability of any of our subsidiaries to

    (1) pay dividends or make any other distributions on its Equity Interests
  or pay any Debt or other obligation owed to us or any of our subsidiaries,

    (2) make any Investment in us or any of our subsidiaries or

    (3) transfer any of its property or assets to us or any of our
  subsidiaries.

  Notwithstanding the foregoing, we may, and may allow any of our subsidiaries
to, permit to exist such an encumbrance or restriction:

    (1) pursuant to an agreement in effect at or entered into on the date on
  which the old notes were originally issued;

    (2) with respect to any of our subsidiaries pursuant to an agreement
  relating to any Debt issued by the subsidiary on or prior to the date on
  which the subsidiary became a subsidiary of our company and outstanding on
  that date, other than Debt issued as consideration in, or to provide all or
  any portion of the funds utilized to consummate, the transaction or series
  of related transactions pursuant to which the subsidiary became a
  subsidiary of our company;


                                       41
<PAGE>

    (3) pursuant to an agreement effecting a refinancing of Debt issued
  pursuant to an agreement referred to in clause (1) or (2) or contained in
  any amendment to an agreement referred to in clause (1) or (2), provided
  that the encumbrances and restrictions contained in the refinancing
  agreement or amendment are no less favorable to the holders of notes than
  encumbrances and restrictions contained in those agreements;

    (4) consisting of customary nonassignment provisions in leases governing
  leasehold interests to the extent those provisions restrict the transfer of
  the lease;

    (5) in the case of clause (3) of the preceding paragraph, restrictions
  contained in security agreements securing Debt of a subsidiary of our
  company otherwise permitted under the indenture, to the extent those
  restrictions restrict the transfer of the property subject to the security
  agreements; or

    (6) relating to a Non-Recourse Subsidiary.

  Limitation on Sales of Assets and Equity Interests of Subsidiaries. The
indenture provides that we shall not, and shall not permit any subsidiary,
other than Non-Recourse Subsidiaries, of our company, to make any Asset
Disposition unless:

    (1) we or our subsidiary receive consideration at the time of the Asset
  Disposition at least equal to the fair market value, as determined in good
  faith by the board of directors of AK Holding, including their
  determination as to the value of all non-cash consideration, of the shares
  and assets subject to such Asset Disposition and at least 75% of the
  consideration is in the form of cash or Cash Equivalents; and

    (2) an amount equal to 100% of the Net Available Cash from such Asset
  Disposition is applied by us or our subsidiary,

      (a) first, to the extent we elect, or are required by the terms of
    any Debt, to prepay, repay or purchase Debt of our company, that
    subsidiary or a Wholly Owned Guarantor Subsidiary, other than any
    Redeemable Equity Interests, Non-Recourse Debt or Debt owed to us or an
    affiliate of ours, within 60 days from the later of the date of the
    Asset Disposition or the receipt of the Net Available Cash;

      (b) second, to the extent of the balance of the Net Available Cash
    after application in accordance with clause (a), at our election, to
    the investment by our company or that subsidiary or any Wholly Owned
    Guarantor Subsidiary in assets to replace the assets that were the
    subject of the Asset Disposition or an asset that, as determined by the
    board of directors of AK Holding, will be used in the business of our
    company and the Wholly Owned Guarantor Subsidiaries existing on the
    date on which the old notes were originally issued or in businesses
    reasonably related thereto, in each case within the later of one year
    from the date of the Asset Disposition or the receipt of the Net
    Available Cash; and

      (c) third, to the extent of the balance of the Net Available Cash
    after application in accordance with clauses (a) and (b), to make an
    offer to purchase notes at par;

provided that in connection with any prepayment, repayment or purchase of Debt
pursuant to clause (a) above, we must cause the related loan commitment, if
any, to be permanently reduced in an amount equal to the principal amount that
is prepaid, repaid or purchased.

  Notwithstanding the requirement in clause (1) above that at least 75% of
consideration consist of cash or Cash Equivalents, we and our subsidiaries may
make one or more Asset Dispositions for

                                       42
<PAGE>

which the consideration, in addition to the non-cash consideration permitted by
that clause, consists of or includes

    (A) non-cash consideration, the aggregate fair market value of which, as
  determined in good faith by the board of directors of AK Holding, for all
  Asset Dispositions made after the date on which the old notes were
  originally issued, does not exceed $10.0 million, and

    (B) non-cash consideration, the aggregate fair market value of which, as
  determined in good faith by the board of directors of AK Holding, for all
  Asset Dispositions made after the date on which the old notes were
  originally issued, does not exceed $50.0 million, consisting of the
  cancellation of Debt of our company or its subsidiaries existing on the
  date on which the notes were originally issued;

provided that in connection with the cancellation of Debt described in clause
(B) above, we or our subsidiary must cause the related loan commitment, if any,
to be permanently reduced in an amount equal to the principal so canceled.

  Notwithstanding the provisions of clause (2) above, in the event that the Net
Available Cash resulting from any Asset Disposition is less than $25.0 million,
the application of an amount equal to that Net Available Cash in accordance
with this covenant may be deferred until such time as the Net Available Cash
from any prior or subsequent Asset Dispositions not otherwise applied in
accordance with this covenant, is at least equal to $25.0 million. In the event
that the Net Available Cash resulting from any Asset Disposition, after giving
effect to clauses (2)(a) and (b) above, is less than $10.0 million, the
application of the amount equal to such Net Available Cash to make an offer to
purchase notes in accordance with clause (2)(c) may be deferred until such time
as that Net Available Cash, together with Net Available Cash from any prior or
subsequent Asset Dispositions not otherwise applied in accordance with this
covenant, is at least equal to $10.0 million. Pending application of Net
Available Cash pursuant to this covenant, the Net Available Cash shall be
invested in Cash Equivalents. To the extent any portion of the amount of Net
Available Cash remains after compliance with this covenant, and provided that
all holders of notes have been given the opportunity to tender their notes for
repurchase as provided in clause (2)(c) above, we may use the remaining amount
for general corporate purposes.

  Limitation on Transactions with Affiliates. The indenture provides that we
shall not, and shall not permit any of our subsidiaries to, conduct any
business or enter into any transaction or series of similar transactions
(including the purchase, sale, lease or exchange of any property or the
rendering of any service) with any affiliate of our company or any legal or
beneficial owner of 5% or more of any class of Equity Interests of AK Holding
or with an affiliate of that owner (other than a Wholly Owned Subsidiary or any
employee stock ownership plan for the benefit of our company or its
subsidiary's employees) unless the terms of the business, transaction or series
of transactions are

    (1) set forth in writing, and

    (2) not less favorable to our company or its subsidiary than terms that
  would be obtainable at the time for a comparable transaction or series of
  similar transactions in arms-length dealings with an unrelated third
  person.

  In addition, if the business, transaction or series of transactions involves
in excess of

    (A) $5.0 million, the board of directors of AK Holding must, by
  resolution, determine in good faith that the business or transaction or
  series of transactions meets the criteria set forth in clause (2) above, or

                                       43
<PAGE>

    (B) $25.0 million and as to which there are no disinterested directors,
  we must obtain an opinion of a nationally recognized expert with experience
  in appraising the terms and conditions of the type of business or
  transaction or series of transactions stating that the business or
  transaction or series of transactions is fair, from a financial point of
  view, to our company or its subsidiary.

The provisions of this paragraph do not apply to performance of contractual
obligations with respect to Eveleth Mines existing as of the date of the
indenture under which the notes were originally issued.

  Lines of Business. The indenture provides that we shall not, and shall not
permit any of our subsidiaries to, enter into any business, either directly or
through any subsidiary, except for those businesses in which our company and
its subsidiaries were engaged on the date on which the notes were originally
issued or businesses reasonably related thereto.

  Restrictions on Activities of AK Holding. The terms of the indenture prohibit
AK Holding from

    (1) engaging in any activities or holding any assets other than

      (a) holding 100% of the Equity Interests of our company and debt
    securities of our company that were held by AK Holding at the date of
    the indenture and

      (b) those activities incidental to maintaining its status as a public
    company, and

    (2) incurring any liabilities other than liabilities relating to AK
  Holding's guarantee of the notes or any guarantees by AK Holding of any
  Permitted Credit Facility, any other Debt of our company or any Debt of any
  Significant Subsidiary that is guaranteed by us and any other obligations
  or liabilities incidental to holding 100% of the Equity Interests of our
  company and those liabilities incidental to its status as a public company.

For purposes of this covenant, the term "liabilities" does not include any
liability for the declaration and payment of dividends on any Equity Interests
of AK Holding. The indenture also provides that if AK Holding merges into our
company, this covenant shall no longer be applicable.

Defined Terms

  Set forth below is a summary of defined terms used in the indenture and this
description of notes. We urge you to read the indenture for the full definition
of all of these terms.

  "Asset Disposition" means any sale, lease, transfer or other disposition, or
series of related sales, leases, transfers or dispositions, of Equity Interests
of a subsidiary (other than directors' qualifying shares), property or other
assets (each referred to for the purposes of this definition as a
"disposition") by AK Steel or any of its subsidiaries, including any
disposition by means of a merger, consolidation or similar transaction, other
than:

    (1) a disposition by AK Steel or a subsidiary to AK Steel or a Wholly
  Owned Guarantor Subsidiary;

    (2) a disposition of property or assets at fair market value, as
  determined in good faith by the board of directors of AK Holding, in the
  ordinary course of business;

    (3) a disposition of obsolete assets in the ordinary course of business;


                                       44
<PAGE>

    (4) a disposition that constitutes a Restricted Payment or a
  sale/leaseback transaction;

    (5) a sale of accounts receivable under a Permitted Credit Facility; and

    (6) a transfer of accounts receivable that constitutes a Permitted
  Investment under clause (5) or (6) of the definition of Permitted
  Investments.

  "Attributable Debt" in respect of a sale/leaseback transaction means, as of
the date of determination, the present value (discounted at the lower of the
interest rate of the sale/leaseback transaction and the interest rate borne by
the notes, compounded annually) of the total obligations of the lessee for
rental payments during the remaining term of the lease included in the
sale/leaseback transaction, including any period for which the lease has been
extended.

  "Average Life" means, as of the date of determination, with respect to any
Debt, the quotient obtained by dividing

    (x) the sum of the products of the numbers of years from the date of
  determination to the dates of each successive scheduled principal payment
  of the Debt multiplied by the amount of the principal payment by

    (y) the sum of all scheduled principal payments.

  "Capital Lease Obligations" of a person means any obligation which is
required to be classified and accounted for as a capital lease on the face of a
balance sheet of that person prepared in accordance with generally accepted
accounting principles; the amount of the obligation shall be the capitalized
amount of that obligation, determined in accordance with generally accepted
accounting principles; and the stated maturity of the obligation shall be the
date of the last payment of rent or any other amount due under the lease prior
to the first date upon which the lease may be terminated by the lessee without
payment of a penalty.

  "Cash Equivalents" means:

    (1) Investments in U.S. government obligations maturing within 365 days
  of the date of acquisition thereof;

    (2) Investments in certificates of deposit or Eurodollar deposits
  maturing within 365 days of the date of acquisition thereof issued by a
  bank or trust company which is organized under the laws of the United
  States or any state thereof and which has a combined capital and surplus of
  at least $1.0 billion and rated at least A3 by Moody's Investors Service,
  Inc.;

    (3) Investments in repurchase agreements, involving Investments in U.S.
  government obligations or other Cash Equivalents entered into with any
  bank, trust company or investment bank rated at least A- and A-1 by
  Standard & Poor's and at least A3 and P-1 by Moody's Investors Service,
  Inc.;

    (4) Investments in commercial paper maturing not more than 90 days from
  the date of acquisition thereof and having one of the two highest ratings
  obtainable from each of Standard & Poor's and Moody's Investors Service,
  Inc. issued by a corporation, other than AK Steel or an Affiliate of AK
  Steel, that is organized under the laws of any state of the United States
  or the District of Columbia; and

    (5) Investments in money market accounts or funds whose assets consist
  solely of cash or Cash Equivalents.

                                       45
<PAGE>

  "Change in Control" means the occurrence of any of the following events:

    (1) any "person", as that term is used in Sections 13(d) and 14(d) of the
  Exchange Act, is or becomes the beneficial owner, as defined in Rules 13d-3
  and 13d-5 under the Exchange Act, except that a person shall be deemed to
  have "beneficial ownership" of all shares that the person has the right to
  acquire, whether that right is exercisable immediately or only after the
  passage of time, directly or indirectly, of more than 40% of the total
  voting power of the Voting Equity Interests of AK Holding; provided that
  the person shall not be deemed the beneficial owner of shares tendered
  pursuant to a tender or exchange offer made by that person or any affiliate
  of that person until the tendered shares are accepted for purchase or
  exchange;

    (2) during any period of two consecutive years, individuals who at the
  beginning of that period constituted the board of directors of AK Holding,
  together with any new directors whose election by that board of directors
  of AK Holding or whose nomination for election by the shareholders of AK
  Holding, was approved by a vote of 66 2/3% of the directors then still in
  office who were either directors at the beginning of that period or whose
  election or nomination for election was previously approved, cease for any
  reason to constitute a majority of the board of directors of AK Holding
  then in office; or

    (3) AK Holding fails to own 100% of the Equity Interests of AK Steel;
  provided that it shall not be deemed a Change in Control if AK Holding
  merges into AK Steel except that, in that case, AK Steel shall be
  substituted for AK Holding for purposes of this definition of "Change in
  Control" and this clause (3) shall no longer be applicable.

  "Consolidated EBITDA Coverage Ratio" as of any date of determination means
the ratio of (x) the aggregate amount of EBITDA for the period of the most
recent four consecutive fiscal quarters ending at least 45 days prior to the
date of determination to (y) Consolidated Interest Expense for the most recent
four consecutive fiscal quarters; provided that:

    (1) if AK Steel or any of its subsidiaries has issued any Debt since the
  beginning of that period that remains outstanding or if the transaction
  giving rise to the need to calculate the Consolidated EBITDA Coverage Ratio
  is an issuance of Debt, or both, EBITDA and Consolidated Interest Expense
  for that period shall be calculated after giving effect on a pro forma
  basis to that Debt as if the Debt had been issued on the first day of that
  period and the discharge of any other Debt repaid, repurchased, defeased or
  otherwise discharged with the proceeds of that new Debt as if that
  discharge had occurred on the first day of such period;

    (2) if since the beginning of that period AK Steel or any of its
  subsidiaries shall have made any Asset Disposition, the EBITDA for that
  period shall be reduced by an amount equal to the EBITDA, if positive,
  directly attributable to the assets that are the subject of the Asset
  Disposition for that period, or increased by an amount equal to the EBITDA,
  if negative, directly attributable to those assets for that period, and
  Consolidated Interest Expense for that period shall be reduced by an amount
  equal to the Consolidated Interest Expense directly attributable to any
  Debt of AK Steel or any of its subsidiaries repaid, repurchased, defeased
  or otherwise discharged with respect to AK Steel and its continuing
  subsidiaries in connection with the Asset Dispositions for that period (or,
  if the Equity Interests of any subsidiary of AK Steel are sold, the
  Consolidated Interest Expense for that period directly attributable to the
  Debt of that subsidiary to the extent AK Steel and its continuing
  subsidiaries are no longer liable for the Debt after the sale);

    (3) if since the beginning of that period AK Steel or any of its
  subsidiaries, by merger or otherwise, shall have made an Investment in any
  subsidiary of AK Steel, or any person that

                                       46
<PAGE>

  becomes a subsidiary of AK Steel, or an acquisition of assets, including
  any acquisition of assets occurring in connection with a transaction
  causing a calculation to be made hereunder, that constitutes all or
  substantially all of an operating unit of a business, EBITDA and
  Consolidated Interest Expense for that period shall be calculated after
  giving pro forma effect thereto, including the issuance of any Debt, as if
  the Investment or acquisition occurred on the first day of that period; and

    (4) if since the beginning of that period any person that subsequently
  became a subsidiary of AK Steel or was merged with or into AK Steel or any
  subsidiary of AK Steel since the beginning of that period shall have made
  any Asset Disposition or any Investment that would have required an
  adjustment pursuant to clause (2) or (3) above if made by AK Steel or a
  subsidiary of AK Steel during that period, EBITDA and Consolidated Interest
  Expense for that period shall be calculated after giving pro forma effect
  to the Asset Disposition or Investment as if it had occurred on the first
  day of that period.

    For purposes of this definition, whenever pro forma effect is to be given
  to an acquisition of assets, the amount of income or earnings relating to
  those assets, and the amount of Consolidated Interest Expense associated
  with any Debt issued in connection with that acquisition, the pro forma
  calculations shall be determined in good faith by a responsible financial
  or accounting Officer of AK Steel. If any Debt bears a floating rate of
  interest and is being given pro forma effect, the interest on that Debt
  shall be calculated as if the rate in effect on the date of determination
  had been the applicable rate for the entire period, taking into account any
  Interest Rate Protection Agreement applicable to that Debt if the Interest
  Rate Protection Agreement has a remaining term in excess of 12 months.

  "Consolidated Interest Expense" means, for any period, the total interest
expense of AK Holding and its consolidated subsidiaries, other than Non-
Recourse Subsidiaries, including:

    (1) interest expense attributable to capital leases;

    (2) amortization of debt discount and debt issuance cost;

    (3) capitalized interest;

    (4) non-cash interest payments;

    (5) commissions, discounts and other fees and charges owed with respect
  to letters of credit and bankers' acceptance financing;

    (6) net costs under Interest Rate Protection Agreements, including
  amortization of fees;

    (7) Preferred Equity Interests dividends or distributions in respect of
  all Preferred Equity Interests held by Persons other than AK Steel or a
  Wholly Owned Subsidiary;

    (8) interest allocated in connection with investments in discontinued
  operations; and

    (9) interest actually paid by AK Holding or any of its consolidated
  subsidiaries, other than Non-Recourse Subsidiaries, under any guarantee of
  Debt or other obligation of any other Person.

  "Consolidated Net Income" means, for any period, the net income or loss of AK
Holding and its consolidated subsidiaries; provided, that there shall not be
included in Consolidated Net Income:

    (1) any net income or loss of any person if that person is not a
  subsidiary of AK Steel, except that AK Steel's equity in the net income of
  the person for that period shall be included in

                                       47
<PAGE>

  Consolidated Net Income up to the aggregate amount of cash actually
  distributed by the person during that period to AK Steel or a subsidiary of
  AK Steel, other than a Non-Recourse Subsidiary, as a dividend or other
  distribution, subject to the limitations contained in clause (3) below in
  the case of a dividend or other distribution to a subsidiary of AK Steel;

    (2) any net income or loss of any person acquired by AK Steel or a
  subsidiary of AK Steel in a pooling of interests transaction for any period
  prior to the date of that acquisition;

    (3) any net income of any subsidiary of AK Steel if the subsidiary is
  subject to restrictions, directly or indirectly, on the payment of
  dividends or the making of distributions by the subsidiary, directly or
  indirectly, to AK Steel, except that

      (a) AK Steel's equity in the net income of the subsidiary for that
    period shall be included in Consolidated Net Income up to the aggregate
    amount of cash actually distributed by the subsidiary during that
    period to AK Steel or another subsidiary of AK Steel as a dividend or
    other distribution, subject to the limitation contained in this clause
    in the case of a dividend or other distribution to another subsidiary,
    and

      (b) AK Steel's equity in a net loss of the subsidiary for that period
    shall be included in determining Consolidated Net Income;

    (4) any gain or loss realized upon the sale or other disposition of any
  property, plant or equipment of AK Steel or its consolidated subsidiaries,
  including pursuant to any sale/leaseback transaction, that is not sold or
  otherwise disposed of in the ordinary course of business and any gain or
  loss realized upon the sale or other disposition of any Equity Interests of
  any person;

    (5) any net income or loss of any Non-Recourse Subsidiary, except that AK
  Steel's equity in the net income of the Non-Recourse Subsidiary for that
  period shall be included in Consolidated Net Income up to the aggregate
  amount of cash actually distributed by the Non-Recourse Subsidiary during
  that period to AK Steel as a dividend or other distribution; and

    (6) the cumulative effect of a change in accounting principles.

  "Consolidated Net Tangible Assets" of any person means the total assets of
that person and its consolidated subsidiaries after deducting

    (1) intangible assets,

    (2) current liabilities, excluding any current liabilities that are by
         their terms extendible or renewable at the option of the obligor to
         a time more than 12 months after the time as of which the amount of
         current liabilities is being computed and

    (3) minority interests, if any, in any assets of that person's
         subsidiaries.

  "Consolidated Net Worth" of any person means the total of the amounts shown
on the balance sheet of that person and its consolidated subsidiaries,
determined on a consolidated basis in accordance with generally accepted
accounting principles, as of the end of the most recent fiscal quarter of that
person ending at least 45 days prior to the taking of any action for the
purpose of which the determination is being made, as:

    (1) the par or stated value of all outstanding Equity Interests of that
  person; plus

    (2) paid-in capital or capital surplus relating to those Equity
  Interests; plus

    (3) any retained earnings or earned surplus; less (x) any accumulated
  deficit, (y) any amounts attributable to Redeemable Equity Interests and
  (z) any amounts attributable to Exchangeable Equity Interests.

                                       48
<PAGE>

  "Debt" of any person means, without duplication,

    (1) the principal of and premium, if any, in respect of

      (a) indebtedness of that person for money borrowed and

      (b) indebtedness evidenced by notes, debentures, bonds or other
    similar instruments for the payment of which that person is responsible
    or liable;

    (2) all Capital Lease Obligations of that person;

    (3) all obligations of that person issued or assumed as the deferred
  purchase price of property, all conditional sale obligations of that person
  and all obligations of that person under any title retention agreement, but
  excluding trade accounts payable arising in the ordinary course of
  business;

    (4) all obligations of that person for the reimbursement of any obligor
  on any letter of credit, banker's acceptance or similar credit transaction,
  excluding obligations with respect to letters of credit securing
  obligations, other than obligations described in clauses (1) through (3)
  above, entered into in the ordinary course of business of that person to
  the extent the letters of credit are not drawn upon or, if and to the
  extent drawn upon, that drawing is reimbursed no later than the third
  business day following receipt by that person of a demand for reimbursement
  following payment on the letter of credit;

    (5) the amount of all obligations of that person with respect to the
  redemption, repayment or other repurchase of any Redeemable Equity
  Interests, but excluding any accrued dividends;

    (6) all obligations of that person under interest rate swap or similar
  agreements, or foreign currency or commodity hedge, exchange or similar
  agreements of that person;

    (7) all obligations of the type referred to in clauses (1) through (6) of
  other persons and all dividends of other persons for the payment of which,
  in either case, that person is responsible or liable, directly or
  indirectly, as obligor, guarantor or otherwise, including by means of any
  guarantee; and

    (8) all obligations of the type referred to in clauses (1) through (7) of
  other persons secured by any lien on any property or asset of that person,
  whether or not such obligation is assumed by that person, the amount of
  that obligation being deemed to be the lesser of the value of the property
  or assets or the amount of the obligation so secured.

  "Defaulting Subsidiary" means any subsidiary of AK Steel, other than a Non-
Recourse Subsidiary, with respect to which a default or event of default has
occurred.

  "EBITDA" for any period means the Consolidated Net Income of AK Holding for
that period, but without giving effect to adjustments, accruals, deductions or
entries resulting from purchase accounting, extraordinary losses or gains and
any gains or losses from any Asset Dispositions, plus

    (1) the following to the extent deducted in calculating Consolidated Net
  Income for that period:

      (a) income tax expense,

      (b) Consolidated Interest Expense,

      (c) depreciation expense,

      (d) amortization expense,


                                       49
<PAGE>

      (e) the non-cash portion of postretirement benefits other than
    pensions and

      (f) special charges taken after December 31, 1996 in respect of which
    AK Holding has delivered to the trustee

             (x) an officers' certificate setting forth estimates, made in
           good faith by a responsible financial or accounting officer of AK
           Holding, of the cash costs estimated, at the time those special
           charges are recorded, to be paid during any period for those
           special charges and containing an undertaking of AK Holding to
           deliver to the trustee, as soon as practicable after AK Holding
           determines that those estimates are not appropriate, a supplemental
           officers' certificate setting forth appropriate adjustments to
           those estimates and

             (y) together with any officers' certificate or supplemental
           officers' certificate referred to in clause (x), a report prepared
           by AK Holding's independent auditors setting forth the procedures
           performed by the auditors in connection with those special charges
           and the related cash costs estimated to be paid during any period
           for those charges

  minus

    (2) to the extent not deducted in calculating Consolidated Net Income for
  that period, cash costs estimated to be paid during that period for special
  charges taken during any period as set forth in the officers' certificate
  most recently delivered to the trustee in respect of those special charges
  pursuant to clause (1)(f) of this definition.

  "Equity Interests" means any and all shares, interests, rights to purchase,
warrants, options, participations or other equivalents of or interests in
corporate stock or other equity participations, however designated, including
partnership interests, whether general or limited, including any Preferred
Equity Interests.

  "Exchangeable Equity Interests" of any person means any Equity Interest that
is exchangeable for or convertible into another security, other than any Equity
Interest of that person which is neither an Exchangeable Equity Interest nor a
Redeemable Equity Interest.

  "Guarantor Subsidiary" means any subsidiary of AK Steel, other than a Non-
Recourse Subsidiary, that executes a supplement to the indenture pursuant to
which the subsidiary jointly and severally unconditionally guarantees the due
and punctual payment and performance of the Obligations and assumes the other
obligations of a Guarantor Subsidiary pursuant to the indenture, in the manner
provided by the indenture.

  "Interest Rate Protection Agreement" means any interest rate swap agreement,
interest rate cap agreement or other financial agreement or arrangement
designed to protect AK Steel or any subsidiary of AK Steel against fluctuations
in interest rates.

  "Inventory" of any person means any and all inventory of any kind of that
person, including any or all of the following: inventory, merchandise, goods
and other tangible personal property that are held for sale or lease by that
person; all materials used or consumed in the business of that person, but
excluding from the foregoing equipment of that person; all trademarks,
servicemarks, trade names and similar intangible property owned or used by that
person in its business, together with the goodwill of the business symbolized
thereby and all rights relating thereto ("Intangible Property"); and all books
and records relating to the foregoing and the proceeds thereof.

                                       50
<PAGE>

  "Investment" in any person means any loan or advance to, any acquisition of
Equity Interests, equity interest, obligation or other security of, or capital
contribution or other investment in, that person.

  "Issue" means issue, assume, guarantee, incur or otherwise become liable for;
provided that any Debt or Equity Interests of a person existing at the time the
person becomes a subsidiary of AK Steel, whether by merger, consolidation,
acquisition or otherwise, shall be deemed to be issued by the subsidiary at the
time it becomes a subsidiary of AK Steel.

  "JV Subsidiary" means a Guarantor Subsidiary which (1) was created or became
a subsidiary of AK Steel after the date on which the old notes were originally
issued and (2) has not acquired any assets directly or indirectly from AK Steel
or any subsidiary of AK Steel, other than (a) cash constituting a Restricted
Payment or (b) assets, in an Asset Disposition, which were acquired by AK Steel
and its subsidiaries within one year prior to that Asset Disposition.

  "Net Available Cash" from an Asset Disposition means cash payments received
from the Asset Disposition, including any cash payments received by way of
deferred payment of principal pursuant to a note or installment receivable or
otherwise, but only as and when received, but excluding any other consideration
received in the form of assumption by the acquiring person of Debt or other
obligations relating to those properties or assets or received in any other
noncash form. In each case, the amount of Net Available Cash shall be net of
the following:

    (1) all legal, title and recording tax expenses, commissions and other
  fees and expenses incurred,

    (2) all Federal, state, provincial, foreign and local taxes required to
  be accrued as a liability under generally accepted accounting principles,
  as a consequence of the Asset Disposition,

    (3) all payments made on any Debt that is secured by any assets subject
  to the Asset Disposition, in accordance with the terms of any lien upon or
  other security agreement of any kind with respect to those assets, or which
  must by its terms, or in order to obtain a necessary consent to the Asset
  Disposition, or by applicable law be repaid out of the proceeds from the
  Asset Disposition, and

    (4) of all distributions and other payments required to be made to
  minority interest holders in subsidiaries or joint ventures as a result of
  the Asset Disposition.

  "Net Cash Proceeds" with respect to any issuance or sale of Equity Interests
means the cash proceeds of that issuance or sale net of attorneys' fees,
accountants' fees, underwriters' or placement agents' fees, discounts or
commissions and brokerage, consultant and other fees actually incurred in
connection with that issuance or sale and net of taxes paid or payable as a
result of that issuance or sale.

  "Non-Convertible Equity Interests" means, with respect to any person, any
non-convertible Equity Interests of that person and any Equity Interests of
that person convertible solely into non-convertible Equity Interests of that
person; provided that Non-Convertible Equity Interests shall not include any
Redeemable Equity Interests or Exchangeable Equity Interests.

  "Non-Recourse Debt" means Debt or that portion of Debt

    (1) issued to a person other than AK Holding, AK Steel or any subsidiary
  of AK Steel, other than a Non-Recourse Subsidiary and

                                       51
<PAGE>

    (2) no default with respect to which, including any rights which the
  holders thereof may have to take enforcement action against a Non-Recourse
  Subsidiary, would permit, upon notice, lapse of time or both, any holder of
  any other Debt of AK Holding, AK Steel or any subsidiary of AK Steel, other
  than a Non-Recourse Subsidiary, to declare a default on that other Debt or
  cause the payment of that other Debt to be accelerated or payable prior to
  its stated maturity.

  "Non-Recourse Subsidiary" means a subsidiary of AK Steel in respect of any
obligation of which neither AK Holding, AK Steel nor any subsidiary of AK
Steel, other than another Non-Recourse Subsidiary, has issued a Guarantee, and
which

    (1) has not acquired any assets directly or indirectly from AK Holding,
  AK Steel or any subsidiary of AK Steel, other than

      (a) cash constituting a Restricted Payment and

      (b) Accounts Receivable that have been sold or otherwise transferred
    to that subsidiary in an Accounts Receivable financing for AK Steel or
    another subsidiary of AK Steel,

    (2) only owns properties acquired after the date on which the notes were
  originally issued and

    (3) has no Debt other than Non-Recourse Debt and Debt issued to AK Steel
  or a Significant Subsidiary which constitutes a Permitted Investment under
  clause (5) of the definition of Permitted Investment.

  "Normal Replacement Assets" means any assets other than Special Assets.

  "Obligations" means:

    (1) the principal of, premium, if any, and interest on the notes,

    (2) all other amounts due and payable under the indenture and the notes,
  and

    (3) all other obligations and liabilities of AK Steel whether direct or
  indirect, absolute or contingent, due or to become due, now existing or
  subsequently issued, which may arise under, out of or in connection with
  the indenture and the notes or any other documents made, delivered or given
  in connection therewith, (a) whether on account of principal, premium, if
  any, interest, reimbursement obligations, fees, indemnities, costs,
  expenses (including all fees and disbursements of counsel to the trustee or
  the holders for which AK Steel has become obligated pursuant to the terms
  of the indenture) or otherwise and (b) whether or not an allowable claim
  against AK Steel under the Bankruptcy Law or otherwise enforceable against
  AK Steel, and including, in any event, interest and other liabilities
  accruing or arising after the filing by or against AK Steel of a petition
  under the Bankruptcy Law or that would have so accrued or arisen but for
  the filing of such a petition.

  "Permitted Credit Facility" or "Facilities" means any agreement or agreements
providing for

    (1) the making of a loan or loans or the advancing of credit,

    (2) the sale of accounts receivable of AK Steel or any Significant
  Subsidiary under any asset securitization facility or other financing
  facility for the financing of accounts receivable of AK Steel or any
  Significant Subsidiary or

    (3) the issuance of letters of credit and/or the creation of bankers'
  acceptances,

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<PAGE>

  under which the aggregate amount that may be issued or otherwise obtained,
  in the case of clauses (1), (2) and (3), is based upon eligible accounts
  receivable and eligible Inventory and the aggregate principal amount of
  Debt, or (in the case of clause (2)) aggregate Investments outstanding,
  excluding Permitted Investments under clause (5) or (6) of the definition
  of "Permitted Investments" in respect of the asset securitization facility,
  shall not at any time exceed the greater of (a) $75.0 million and (b) an
  amount equal to

      (w) 100% of the book value of the consolidated accounts receivable of
    AK Steel and its Significant Subsidiaries that are Guarantor
    Subsidiaries or Non-Recourse Subsidiaries, plus

      (x) 100% of the book value, excluding last-in-first-out reserves, of
    the consolidated Inventory of AK Steel and its Subsidiaries that are
    Guarantor Subsidiaries, minus

      (y) the aggregate principal amount of outstanding Debt secured by any
    accounts receivable or Inventory of AK Steel or any of its
    subsidiaries, other than Debt outstanding under any Permitted Credit
    Facility, minus

      (z) other outstanding Investments under any asset securitization or
    similar facility in respect of accounts receivable or Inventory of AK
    Steel or any of its subsidiaries, other than

             (A) Debt under a Permitted Credit Facility or Debt described in
           clause (y) above or

             (B) Permitted Investments under clause (5) and (6) of the
           definition of "Permitted Investments."

  "Permitted Investments" means:

    (1) Cash Equivalents;

    (2) Investments in AK Steel, any Wholly Owned Guarantor Subsidiary or any
  person which will become a Wholly Owned Guarantor Subsidiary as a result of
  that Investment;

    (3) loans and reasonable advances to employees of AK Steel or its
  subsidiaries for travel, entertainment and relocation expenses in the
  ordinary course of business;

    (4) Investments in obligations the interest on which is excluded from
  income for Federal or state income tax purposes and that have been issued
  or guaranteed by any state of the United States of America, the District of
  Columbia or the Commonwealth of Puerto Rico or any political subdivision,
  agency, authority or instrumentality of any of the foregoing, provided that
  at the date of acquisition of that obligation

      (a) its remaining life to maturity shall be less than one year and

      (b) the issuer or guarantor of the obligation shall have one of the
    two highest short-term debt ratings obtainable from each of Standard &
    Poor's and Moody's Investors Service, Inc.;

    (5) Investments resulting from the transfer of accounts receivable of AK
  Steel or its Significant Subsidiaries that are Guarantor Subsidiaries to a
  Non-Recourse Subsidiary, the only business of which is the acquisition and
  financing of Accounts Receivable under a Permitted Credit Facility;


                                       53
<PAGE>

    (6) Investments resulting from the transfer of accounts receivable of AK
  Steel or its Significant Subsidiaries that are Guarantor Subsidiaries or
  Non-Recourse Subsidiaries to a trust, the only purpose of which is the
  acquisition and financing of those accounts receivable, provided that the
  aggregate amount of outstanding Debt issued by that trust to, and
  outstanding Investments in such trust made by, persons other than AK Steel
  and its Significant Subsidiaries that are Guarantor Subsidiaries or Non-
  Recourse Subsidiaries shall not at any time exceed the greater of $75.0
  million and an amount equal to

      (w) 85% of the book value of the consolidated accounts receivable of
    AK Steel and its Significant Subsidiaries that are Guarantor
    Subsidiaries or Non-Recourse Subsidiaries, plus

      (x) 100% of the book value, excluding last-in-first-out reserves, of
    the consolidated Inventory of AK Steel and its subsidiaries that are
    Guarantor Subsidiaries, minus

      (y) the aggregate principal amount of outstanding Debt secured by any
    accounts receivable or Inventory of AK Steel or any of its
    subsidiaries, other than to the extent included in clause (z) below,
    minus

      (z) other outstanding Investments, excluding Investments in that
    trust, under any asset securitization or similar facility in respect of
    accounts receivable or Inventory of AK Steel or any of its
    subsidiaries; and

    (7) until December 31, 1999, Investments, not to exceed $200.0 million at
  any time, in publicly traded debt obligations issued or guaranteed by a
  corporation other than AK Steel that is organized under the laws of any
  state of the United States of America and subject to the reporting
  requirements of Section 13 or 15(d) of the Exchange Act, provided that

      (a) the debt obligations are acquired by AK Steel in the open market
    and not directly from the issuer or underwriter of those obligations or
    an affiliate of the issuer.

      (b) the debt obligations, at the date of acquisition thereof by AK
    Steel, shall have a remaining life to maturity of not more than five
    years, shall provide for payments of principal and interest solely in
    cash and shall be rated at least BB by Standard & Poor's and Ba2 by
    Moody's Investors Service, Inc. and

      (c) not more than $15.0 million of those Investments at any time
    shall consist of debt obligations issued or guaranteed by the same
    corporation and not more than 20% of those Investments at any time
    shall consist of debt obligations issued or guaranteed by corporations
    within the same industry, as determined by Primary Standard Industrial
    Classification Code.

  "Permitted Liens" means, with respect to any person:

    (1) pledges or deposits incurred in the ordinary course of business by
  that person that are:

      (a) made under workers' compensation laws, unemployment insurance
          laws or similar legislation,

      (b) made in good faith in connection with bids, tenders, contracts
          (other than for the payment of Debt) or leases to which that
          person is a party,

      (c) given to secure public or statutory obligations of that person,

      (d) in the form of property, cash or United States government bonds
          given to secure surety or appeal bonds to which that person is a
          party, or

                                       54
<PAGE>

      (e) given as security for contested taxes or import duties or for the
          payment of rent;

    (2) liens imposed by law, such as carriers', warehousemen's and
  mechanics' liens, in each case for sums not yet due or being contested in
  good faith by appropriate proceedings; or other liens arising out of
  judgments or awards against that person with respect to which that person
  shall then be proceeding with an appeal or other proceedings for review or
  time for appeal has not yet expired;

    (3) liens for property taxes not yet subject to penalties for non-payment
  or which are being contested in good faith by appropriate proceedings;

    (4) liens in favor of issuers of surety bonds or letters of credit issued
  pursuant to the request of and for the account of that person in the
  ordinary course of its business; provided that the letters of credit do not
  constitute Debt;

    (5) survey exceptions, encumbrances, easements or reservations of, or
  rights of others for, licenses, rights of way, sewers, electric lines,
  telegraph and telephone lines and other similar purposes, or zoning or
  other restrictions as to the use of real properties or liens incidental to
  the conduct of the business of that person or to the ownership of its
  properties which were not incurred in connection with Debt and which do not
  in the aggregate materially adversely affect the value of those properties
  or materially impair their use in the operation of the business of that
  person;

    (6) liens securing an Interest Rate Protection Agreement if the related
  Debt is, and is permitted to be under the indenture, secured by a Lien on
  the same property securing the Interest Rate Protection Agreement; and

    (7) leases and subleases of real property which do not interfere with the
  ordinary conduct of the business of AK Steel or any of its subsidiaries,
  and which are made on customary and usual terms applicable to similar
  properties.

  "Preferred Equity Interests" as applied to the Equity Interests of any person
means Equity Interests of any class or classes, however designated, which is
preferred as to the payment of dividends or distributions, or as to the
distribution of assets upon any voluntary or involuntary liquidation or
dissolution of that person, over Equity Interests of any other class of that
person.

  "Public Equity Offering" means an underwritten primary public offering of
common stock of AK Holding pursuant to an effective registration statement
under the Securities Act.

  "Redeemable Equity Interests" means any Equity Interest that by its terms or
otherwise is required to be redeemed on or prior to the first anniversary of
the stated maturity of the notes or is redeemable at the option of the holder
of that Equity Interest at any time on or prior to the first anniversary of the
stated maturity of the notes.

  "Refinancing Debt" means Debt issued by AK Steel to refinance any Debt of AK
Steel, including Debt that is issued by AK Steel to refinance any Refinancing
Debt; provided that

    (1) the principal amount of the Debt that is issued shall not exceed the
  principal amount of, and premiums, if any, and accrued interest with
  respect to, the refinanced Debt and reasonable fees, expenses, commissions
  and costs incurred in connection with the issuance of the Debt and

    (2) the Debt that is issued

      (a) shall not mature prior to the Stated Maturity of the refinanced
    Debt and


                                       55
<PAGE>

      (b) shall have an Average Life equal to or greater than the remaining
    Average Life of the refinanced Debt.

  "Significant Subsidiary" means

    (1) any domestic subsidiary, other than a Non-Recourse Subsidiary, of AK
  Steel that at the time of determination either

      (a) had assets that, as of the date of the Holding's most recent
    quarterly consolidated balance sheet, constituted at least 5% of AK
    Holding's total assets on a consolidated basis as of that date, or

      (b) had revenues for the 12-month period ending on the date of AK
    Holding's most recent quarterly consolidated statement of income which
    constituted at least 5% of AK Holding's total revenues on a
    consolidated basis for that period,

    (2) any foreign subsidiary, other than a Non-Recourse Subsidiary, of AK
  Steel that at the time of determination either

      (a) had assets which, as of the date of AK Holding's most recent
    quarterly consolidated balance sheet, constituted at least 5% of AK
    Holding's total assets on a consolidated basis as of that date,
    determined in accordance with generally accepted accounting principles
    or

      (b) had revenues for the 12-month period ending on the date of AK
    Holding's most recent quarterly consolidated statement of income which
    constituted at least 5% of Holding's total revenues on a consolidated
    basis for that period, or

    (3) any subsidiary, other than a Non-Recourse Subsidiary, of AK Steel
  that, if merged with all Defaulting Subsidiaries of AK Steel, would at the
  time of determination either

      (a) have had assets which, as of the date of AK Holding's most recent
    quarterly consolidated balance sheet, would have constituted at least
    10% of AK Holding's total assets on a consolidated basis as of that
    date or

      (b) have had revenues for the 12-month period ending on the date of
    AK Holding's most recent quarterly consolidated statement of income
    which would have constituted at least 10% of AK Holding's total
    revenues on a consolidated basis for that period.

  The determination whether a subsidiary constitutes a "Significant Subsidiary"
for purposes of this definition must be made in accordance with generally
accepted accounting principles.

  "Special Assets" means a capital asset, or series of related capital assets,
with an aggregate purchase price in excess of $20.0 million that enhances the
competitiveness or productivity of the business of AK Steel and its
subsidiaries or is required so that AK Steel and its subsidiaries will be able
to remain in compliance with all material requirements of applicable law.

  "Voting Equity Interests" of a corporation or other entity means all classes
of Equity Interests of a corporation or other entity then outstanding and
normally entitled to vote in the election of directors or other governing body
of that corporation or other entity.

  "Wholly Owned Guarantor Subsidiary" means any Wholly Owned Subsidiary that is
a Guarantor Subsidiary.

  "Wholly Owned Subsidiary" of a person means a subsidiary, other than a Non-
Recourse Subsidiary, of that person all of whose Equity Interests, other than
non-voting, money market

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<PAGE>

preferred shares and directors' qualifying shares, are owned by that person or
another Wholly Owned Subsidiary of that person. Unless otherwise qualified, all
references to a "Wholly Owned Subsidiary" or to "Wholly Owned Subsidiaries"
shall refer to a Wholly Owned Subsidiary or Wholly Owned Subsidiaries of AK
Steel.

Events of Default

   An event of default will occur under the indenture if:

    (1) we fail to pay interest on any note when that interest becomes due
  and payable, and the failure continues for a period of 30 days;

    (2) we fail to pay the principal of any note when the note becomes due
  and payable at its stated maturity, upon redemption, upon declaration or
  otherwise;

    (3) we fail to redeem or purchase notes when required pursuant to the
  indenture and the notes;

    (4) we fail to

      (a) comply with the covenant described under "--When AK Steel or Any
    of Its Subsidiaries May Merge or Transfer Assets,"

      (b) make or consummate an Offer in accordance with the provisions of
    "--Material Covenants--Limitation on Sales of Assets and Equity
    Interests of Subsidiaries" or

      (c) make or consummate a Change in Control Offer in accordance with
    the provisions of "--Change in Control Offer";

    (5) we fail to observe or comply with any of the agreements in the notes
  or the indenture, other than those referred to in clauses (1), (2), (3) or
  (4) above, which failure continues for 60 days after there has been given
  to us by the trustee or to us and the trustee by the holders of at least
  25% in principal amount of notes then outstanding a written notice
  specifying the failure;

    (6) Debt of our company or any Significant Subsidiary is not paid within
  any applicable grace period after final maturity or is accelerated by the
  holders of that Debt because of a default, and the total amount of the Debt
  unpaid or accelerated exceeds $10.0 million or its foreign currency
  equivalent;

    (7) any guarantee of the notes issued by AK Holding or any Significant
  Subsidiary ceases to be in full force and effect other than in accordance
  with its terms, or AK Holding or any Significant Subsidiary or any person
  acting on behalf of AK Holding or that Significant Subsidiary denies or
  disaffirms its obligations under its guarantee of the notes;

    (8) specified events of bankruptcy, insolvency or reorganization occur
  with respect to our company, AK Holding or any Significant Subsidiary; and

    (9) any judgment or decree for the payment of money in excess of $10.0
  million is rendered against our company, AK Holding or any Significant
  Subsidiary and is not discharged and either

      (a) an enforcement proceeding has been commenced by any creditor upon
    that judgment or decree or

      (b) there is a period of 60 days following that judgment or decree
    during which the judgment or decree is not discharged or waived or its
    execution stayed.


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<PAGE>

  If an event of default shall occur and be continuing, either the trustee or
the holders of at least 25% in principal amount of the notes then outstanding
may accelerate the maturity of all notes and, if accelerated, the principal of,
premium, if any, and any accrued and unpaid interest on the notes shall become
due and payable immediately; provided that in the case of any bankruptcy,
insolvency or reorganization event of default, the amount shall become
immediately due and payable without any declaration or other act on the part of
the trustee or any holder. The holders of at least a majority in principal
amount of the then outstanding notes may, under specified circumstances,
rescind the acceleration and its consequences if the rescission would not
conflict with any judgment or decree and if all events of default, other than
the nonpayment of accelerated principal of, premium, if any, and interest on
notes, have been cured or waived as provided in the indenture. The holders of
at least a majority in principal amount of the then outstanding notes may waive
any past default under the indenture, except a default in the payment of
principal, premium or interest on a note or default with respect to specified
covenants under the indenture.

  Subject to provisions for the indemnification of the trustee, the holders of
at least a majority in principal amount of the notes will have the right to
direct the time, method and place of conducting any proceeding for any remedy
available to the trustee or exercising any trust or power conferred on the
trustee, subject to specified limitations contained in the indenture.

  No holder of any note will have any right to pursue any remedy with respect
to the indenture or the notes unless:

    (1) that holder shall have previously given to the trustee written notice
  of a continuing event of default;

    (2) the holders of at least 25% in principal amount of the notes shall
  have made written request to the trustee to pursue the remedy;

    (3) that holder shall have offered the trustee reasonable indemnity
  against any liability;

    (4) the trustee shall have failed to comply with the request within 60
  days after the receipt of that request and the offer of indemnity; and

    (5) no written direction inconsistent with that request shall have been
  given to the trustee during that 60-day period by the holders of at least a
  majority in principal amount of the notes.

  We, AK Holding as guarantor and any other guarantor of the notes will be
required to furnish to the trustee annually a statement as to the performance
by us and the guarantors of certain of the obligations under the indenture and
as to any default in that performance. Upon becoming aware of any default, we
and each guarantor of the notes will be required to deliver an officers'
certificate to the trustee setting forth the details of that default and the
action which we, AK Holding or any other guarantor proposes to take with
respect to the default.

Modification and Waiver

  Amendments of the indenture or the notes may be made by us, the guarantors of
the notes and the trustee with the consent of the holders of at least a
majority in principal amount of the notes; provided that no modification or
amendment may, without the consent of the holder of each note affected by the
amendment:

    (1) reduce the amount of notes whose holders must consent to an
  amendment;

    (2) reduce the rate or extend the interest payment time of any note;

    (3) reduce the principal amount of or extend the stated maturity of any
  note;

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<PAGE>

    (4) reduce the premium payable upon redemption or change the time at
  which any note may be redeemed;

    (5) change the currency of payment of any note;

    (6) make any change in the provisions concerning waiver of defaults by
  holders of the notes or the rights of holders to receive payments of
  principal or interest;

    (7) make any change in provisions regarding Change in Control; or

    (8) make any change in this provision.

  Without the consent of any holder of the notes, we, the guarantors of the
notes and the trustee may amend the indenture or the notes:

    (1) to cure any ambiguity, omission, defect or inconsistency;

    (2) to comply with, among other things, the provisions discussed under
  "--When AK Steel or Any of Its Subsidiaries May Merge or Transfer Assets";

    (3) to provide for uncertificated notes in addition to or in place of
  certificated notes as provided in the indenture;

    (4) to add guarantees with respect to the notes;

    (5) to add to the covenants of our company or the guarantors for the
  benefit of the holders or to surrender any right or power conferred upon us
  or the guarantors in the indenture;

    (6) to reflect the release or addition of a guarantor pursuant to the
  terms of the indenture;

    (7) to comply with any requirements of the SEC in connection with
  qualifying the indenture under the Trust Indenture Act; or

    (8) to make any change that does not adversely affect the rights of any
  holder of the notes.

When AK Steel or Any of Its Subsidiaries May Merge or Transfer Assets

  The indenture provides that we shall not

    (1) consolidate with or merge with or into any other person,

    (2) permit any other person to consolidate with or merge into (a) our
  company or (b) any subsidiary of our company in a transaction in which the
  subsidiary or successor person remains or becomes a subsidiary of our
  company,

    (3) directly or indirectly, transfer, convey, sell, lease or otherwise
  dispose of all or substantially all of its properties and assets,

    (4) directly or indirectly, (a) acquire Equity Interests or other
  ownership interests of any other person, other than as a Permitted
  Investment as defined in clause (5) of the definition of Permitted
  Investments, such that the person becomes a subsidiary of our company or
  (b) purchase, lease or otherwise acquire all or substantially all of the
  property and assets of any person or any existing business of any person,
  whether existing as a separate entity, subsidiary, division, unit or
  otherwise, or

    (5) permit any subsidiaries of our company to enter into any transaction
  described above unless:

      (a) We or our subsidiary will be the continuing entity or the
    resulting, surviving or transferee person, if not our company or a
    subsidiary of our company, will be a person organized and existing
    under the laws of the United States of America, any State thereof or

                                       59
<PAGE>

    the District of Columbia and that person shall expressly assume, by an
    indenture supplemental to the indenture, executed and delivered to the
    trustee, all the obligations of our company or its subsidiary under the
    notes and the indenture;

      (b) Immediately after giving effect to the transaction and treating
    any Debt that becomes an obligation of the resulting, surviving or
    transferee person or any of our subsidiaries as a result of that
    transaction as having been issued by that person or the subsidiary at
    the time of that transaction, no default under the indenture shall have
    occurred and be continuing;

      (c) Immediately after giving effect to the transaction, on a pro
    forma basis, we (or the resulting, surviving or transferee person, if
    not our company) would be able to issue at least $1.00 of Debt pursuant
    to the Consolidated EBITDA Coverage Ratio set forth in the first
    paragraph of the "Limitation on Debt" covenant;

      (d) Immediately after giving effect to the transaction, AK Holding
    shall have Consolidated Net Worth that is not less than the
    Consolidated Net Worth of AK Holding immediately prior to the
    transaction;

      (e) Each guarantor, unless it is the other party to the transactions
    described above, shall expressly confirm, by an indenture supplemental
    to the indenture, executed and delivered to the trustee, that its
    guarantee shall apply to the resulting, surviving or transferee
    person's obligations under the notes; and

      (f) We shall have delivered to the trustee an officers' certificate
    and an opinion of counsel, each stating that the consolidation, merger
    or transfer and the supplemental indentures, if any, comply with the
    indenture;

  provided, that clauses (c) and (d) shall not apply to

      (x) the consolidation or merger of any Wholly Owned Subsidiary with
    or into any other Wholly Owned Subsidiary or our company,

      (y) the transfer, conveyance, sale, lease or other disposal of all or
    substantially all of the properties or assets of a Non-Recourse
    Subsidiary or a subsidiary that is not a Significant Subsidiary,
    including any disposition by means of a merger, consolidation or
    similar transaction, or

      (z) the merger of AK Holding into our company.

  If after the date on which the old notes were originally issued any person
shall become our subsidiary, other than a Non-Recourse Subsidiary, that person
shall

    (1) unconditionally guarantee, by an indenture supplemental to the
  indenture, executed and delivered to the trustee, all of our obligations
  under the notes on the terms set forth in the indenture and

    (2) deliver to the trustee an opinion of counsel stating that the
  supplemental indenture has been duly authorized and constitutes the
  enforceable obligations of that person.

Defeasance

  We may terminate at any time all our obligations under the notes and the
indenture, except for specified obligations, including those relating to the
defeasance trust and obligations to register the transfer or exchange of the
notes, to replace mutilated, destroyed, lost or stolen notes and to maintain

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<PAGE>

a registrar and paying agent in respect of the notes. This is known as "legal
defeasance." At any time we may terminate our obligations under the covenants
described under "--Material Covenants" and "--Change in Control Offer" above.
We may exercise the legal defeasance option notwithstanding the prior exercise
of the covenant defeasance option. If we exercise the legal defeasance option,
payment of the notes may not be accelerated because of an event of default. If
we exercise the covenant defeasance option, payment of the notes may not be
accelerated because of those events of default by AK Steel specified in clause
(4) or (5) of the first paragraph of "--Events of Default" above.

  In order to exercise our defeasance options, we must irrevocably deposit in
trust with the trustee money or U.S. Government Obligations for the payment of
principal of, premium, if any, and interest on the notes to maturity or
redemption and must comply with other conditions, including delivery to the
trustee of an opinion of counsel to the effect that holders of the notes will
not recognize income, gain or loss for federal income tax purposes as a result
of the defeasance and will be subject to federal income tax on the same
amounts, in the same manner and at the same times as would have been the case
if the defeasance had not occurred. In addition, in the case of legal
defeasance only, the opinion of counsel must be based on a ruling of the
Internal Revenue Service or other change in applicable federal income tax law.

CONCERNING THE TRUSTEE

  The trustee may become owner or pledgee of notes and may otherwise deal with
either AK Holding or affiliates of AK Holding with the same rights it would
have if it were not trustee.

  The indenture provides that in case an event of default shall occur and be
continuing, the trustee will exercise the rights and powers vested in it by the
indenture and use the same degree of care and skill in their exercise as a
prudent person would exercise or use under the circumstances in the conduct of
that person's own affairs.

  Fifth Third Bank also serves as trustee under the indenture governing AK
Steel's 9 1/8% Senior Notes Due 2006, and as transfer agent for AK Holding's
common stock.

GOVERNING LAW

  The indenture, the notes and AK Holding's guarantee of the notes are governed
by the laws of the State of New York.

THE PROPOSED AMENDMENTS

  If consented to by the holders of a majority in principal amount of the
notes, the proposed amendments will become effective upon consummation of the
merger.

  The proposed amendments, which will be contained in a supplemental indenture,
will principally affect the following provisions of the indenture:

  .  the definition of Consolidated Net Income and, as a consequence, the
     Limitation on Restricted Payments covenant,

  .  the definitions of Non-Recourse Subsidiary and Guarantor Subsidiary, and

  .  the "Lines of Business" covenant.


                                       61
<PAGE>

  Definition of Consolidated Net Income.

  AK Steel expects to record pre-tax charges in connection with the Armco
merger. Because the merger is being accounted for as a pooling of interests,
these charges are required by generally accepted accounting principles to be
expensed at one time, instead of being capitalized and amortized over future
periods as would be permitted if the merger were accounted for as a purchase.
The resulting reduction in Consolidated Net Income will reduce the amount
available under the "Limitation on Restricted Payments" covenant for the
payment of dividends and would adversely affect AK Holding's ability to
continue to pay regular dividends to its stockholders until late 2000.

  The proposed amendments will permit these charges, as well as similar charges
associated with future business combination transactions, to be excluded from
the calculation of Consolidated Net Income under the indenture solely for
purposes of the "Limitation on Restricted Payments" covenant. This exclusion
would be permitted only to the extent that the charges are not permitted by
generally accepted accounting principles to be capitalized and amortized over
future periods.

  Definition of Non-Recourse Subsidiary and Guarantor Subsidiary.

  The indenture currently provides that any subsidiary of AK Steel that
conducts operations, other than a Non-Recourse Subsidiary, must guarantee AK
Steel's Obligations in respect of the notes on the same terms as AK Holding's
guarantee. At present, none of AK Steel's operations is conducted through
subsidiaries and, therefore, none of AK Steel's existing subsidiaries is a
guarantor of the notes.

  Armco conducts various operations through subsidiaries. Upon consummation of
the merger, Armco's subsidiaries will become subsidiaries of AK Steel and,
unless classified as Non-Recourse Subsidiaries, would be required to guarantee
the notes. Only one of Armco's domestic subsidiaries, Douglas Dynamics, has
operations that would be material to the pro forma results of the combined
companies following the merger. In addition, Armco has a number of foreign
subsidiaries, none of which would be deemed a Significant Subsidiary as defined
in the indenture.

  Under the indenture as currently in effect, the determination of whether a
subsidiary is a Non-Recourse Subsidiary is purely factual and not within AK
Steel's control. The proposed amendment would permit AK Steel to designate one
or more subsidiaries, including those to be acquired as a result of the Armco
merger, as Non-Recourse Subsidiaries. A subsidiary that is so designated would
not be subject to most of the restrictive covenants in the indenture and would
not be obligated to guarantee the notes. However, its financial results must be
excluded from the calculation of Consolidated Net Income and any further
investments in and loans to that subsidiary by AK Steel would be subject to the
"Limitation on Restricted Payments" covenant. It is anticipated that all of
Armco's domestic subsidiaries, other than Douglas Dynamics, will be designated
as Non-Recourse Subsidiaries.

  The proposed amendments also will modify the definition of Guarantor
Subsidiary to exclude from that definition, and, as a consequence, from the
obligation to guarantee the notes, any foreign subsidiary that is not more than
80% owned by AK Steel or that is not a Significant Subsidiary. Because none of
Armco's foreign subsidiaries would be a Significant Subsidiary, none of those
subsidiaries will be required to guarantee the notes. This will avoid potential
adverse tax consequences that can result from a guarantee by a foreign entity
of the debt obligations of a domestic obligor.


                                       62
<PAGE>

  As a result of the foregoing amendments, it is expected that Douglas Dynamics
will be the only subsidiary of Armco that will become a guarantor of the notes.

 Lines of Business Covenant

  Under the indenture as currently in effect, AK Steel and its subsidiaries may
engage only in those lines of business in which they were engaged at the date
of issuance of the old notes and businesses reasonably related thereto.
Although Armco is principally engaged in the manufacture of stainless and
electrical steels, which are the same as or closely related to AK Steel's
existing business, it also has unrelated businesses, such as the operation of
an industrial park.

  To accommodate these non-core operations following consummation of the
merger, the proposed amendments would modify the "Lines of Business" covenant
to permit AK Steel and its subsidiaries to engage in any business so long as
they remain principally engaged in the businesses in which they were engaged
prior to the merger and businesses reasonably related thereto.

                                       63
<PAGE>

                        FEDERAL INCOME TAX CONSEQUENCES

  The following is a summary of the material United States federal income tax
consequences generally applicable to the exchange offer. The statements of
United States tax law set forth below are based on the laws, regulations and
administrative and judicial decisions applicable as of the date of this
prospectus, and are subject to any changes in relevant United States
authorities occurring after that date. Any of those changes, which could be
retroactive, could affect the continuing validity of this discussion.

  The exchange of old notes for new notes in the exchange offer will not be a
taxable exchange for U.S. federal income tax purposes. As a result, there will
be no federal income tax consequences to a holder exchanging an old
unregistered note for a new registered note in the exchange offer. A holder
should have the same adjusted basis and holding period in the new note as it
had in the old note immediately before the exchange.

  The preceding paragraph summarizes the material U.S. federal income tax
consequences associated with the exchange of the old notes for new notes in the
exchange offer. This summary applies only to those persons who are the initial
holders of old notes, who acquired old notes for cash and who hold old notes as
capital assets, and assumes that the old notes were not issued with "original
issue discount," as defined in the Internal Revenue Code of 1986. This summary
also does not address the U.S. federal income tax consequences of the exchange
of notes not held as capital assets within the meaning of Section 1221 of the
Code, or the U.S. federal income tax consequences to investors subject to
special treatment under the U.S. federal income tax laws, such as dealers in
securities or foreign currency, tax-exempt entities, banks, thrifts, insurance
companies, persons that hold the notes as part of a "straddle," a "hedge"
against currency risk or a "conversion transaction," persons that have a
"functional currency" other than the U.S. dollar and investors in pass-through
entities. It also does not address any consequences arising under U.S. federal
gift and estate taxes or under the tax laws of any state, local or foreign
jurisdiction.

  Persons considering the exchange of old notes for new notes in the exchange
offer should consult their own tax advisors concerning the application of
United States federal income tax laws, as well as the laws of any state, local,
or other taxing jurisdiction applicable to their particular situations.

                                       64
<PAGE>

                              PLAN OF DISTRIBUTION

  Each broker-dealer that receives new notes for its own account pursuant to
the exchange offer must acknowledge that it will deliver a prospectus meeting
the requirements of the Securities Act in connection with any resale of new
notes. This prospectus, as it may be amended or supplemented from time to time,
may be used by a broker-dealer in connection with resales of new notes received
in exchange for old notes that had been acquired as a result of market-making
or other trading activities. We have agreed that, for a period of 180 days
after the expiration date of the exchange offer, we will make this prospectus,
as it may be amended or supplemented, available to any broker-dealer for use in
connection with those resales.

  We will not receive any proceeds from any sales of new notes by broker-
dealers. Registered notes received by broker-dealers for their own account
pursuant to the exchange offer may be sold from time to time in one or more
transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on those notes or a combination of those
methods, at market prices prevailing at the time of resale, at prices related
to prevailing market prices or at negotiated prices. Those resales may be made
directly to purchasers or to or through brokers or dealers who may receive
compensation in the form of commissions or concessions from the selling broker-
dealer or the purchasers of those notes. Any broker-dealer that resells new
notes that it received for its own account pursuant to the exchange offer and
any broker or dealer that participates in a distribution of those notes may be
deemed to be an "underwriter" within the meaning of the Securities Act and any
profit on any such resale of those notes and any commission or concessions
received by any participating broker or dealer may be deemed to be underwriting
compensation under the Securities Act. The letter of transmittal states that,
by acknowledging that it will deliver and by delivering a prospectus, a broker-
dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act.

                                 LEGAL MATTERS

  The validity of the notes offered hereby is being passed upon for us by Weil,
Gotshal & Manges LLP, New York, New York.

                                    EXPERTS

  The financial statements incorporated in this prospectus by reference from AK
Steel Holding Corporation's Annual Report on Form 10-K for the year ended
December 31, 1998 have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their report, which also is incorporated herein by
reference, and have been incorporated in reliance upon the report of that firm
given upon their authority as experts in accounting and auditing.

  The Armco consolidated financial statements incorporated in this prospectus
by reference from Armco's Annual Report on Form 10-K for the year ended
December 31, 1998 have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their report, which is incorporated herein by reference,
and have been so incorporated in reliance upon the report of such firm given
upon their authority as experts in accounting and auditing.

                                       65
<PAGE>

                           FORWARD-LOOKING STATEMENTS

  This prospectus includes "forward-looking statements" within the meaning of
Section 27A of the Securities Act and Section 21E of the Exchange Act. All
statements in this prospectus, including statements in the 1998 Annual Report
on Form 10-K of AK Steel Holding Corporation that we have incorporated in this
prospectus by reference, other than statements of historical fact, including,
without limitation, the statements in the 1998 Annual Report on Form 10-K under
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources," regarding AK Steel's
profitability, financial position, liquidity and capital requirements, as well
as the anticipated product mix, costs, tonnage capabilities, performance
characteristics and benefits of Rockport Works, are forward-looking statements.
The words "estimate," "project," "believe," "anticipate," "intend," "expect"
and similar expressions used in this prospectus and the 1998 Annual Report on
Form 10-K are intended to identify forward-looking statements. Although we
believe that the expectations reflected in those forward-looking statements are
reasonable, we cannot assure you that those expectations will prove to have
been correct. Important factors that could cause actual results to differ
materially from management's expectations are disclosed in this prospectus,
including, without limitation, under "Risk Factors." These factors include, but
are not necessarily limited to, the following:

  . the effect of unplanned outages with respect to our operations;

  . the highly cyclical nature of the domestic steel industry and many of the
markets supplied by us and the effect of that cyclicality on prices and volume;

  . the potential impact of strikes or work stoppages at facilities of our
customers and suppliers;

  . the sensitivity of our results to changes in the prices obtained by us for
our products;

  . intense competition due to world steel overcapacity, new domestic capacity
over the next several years and imports;

  . the high capital requirements associated with integrated steel facilities;

  . the significant costs associated with environmental controls and
remediation expenditures and the uncertainty of future environmental control
requirements;

  . employment matters, including costs and uncertainties associated with our
collective bargaining agreements, and employee postretirement obligations;

  . our highly leveraged capital structure;

  . the effect of our customers and suppliers not becoming Year 2000 compliant
in a timely manner;

  . the effect of existing and possible future lawsuits filed against us; and

  . general economic and business conditions, including changes in the
condition of the capital markets and equity markets.

All subsequent written and oral forward-looking statements by or attributable
to us or persons acting on our behalf are expressly qualified in their entirety
by these factors.


                                       66
<PAGE>

          UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL INFORMATION

  The proposed merger of Armco into AK Steel is to be accounted for in
accordance with the pooling of interests method of accounting pursuant to APB
Opinion No. 16. Accordingly, the accompanying unaudited pro forma combined
condensed financial information gives effect to the transaction in accordance
with the pooling of interests method of accounting. Pursuant to Rule 11-02 of
Regulation S-X~ the unaudited pro forma combined condensed financial
information excludes the results of discontinued operations, extraordinary
items and cumulative effects of a change in accounting.

  The unaudited pro forma combined condensed financial information should be
read in conjunction with AK Holding's and Armco's audited consolidated
financial statements and accompanying notes included in their respective annual
reports on Form 10-K for the years ended December 31, 1996, 1997 and 1998 and
AK Holding's and Armco's unaudited condensed consolidated financial statements
and accompanying notes included in their respective quarterly reports on Form
10-Q for the three months ended March 31, 1998 and 1999.

  The unaudited pro forma combined condensed financial information has been
prepared in accordance with generally accepted accounting principles. These
principles require management to make extensive use of estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the consolidated
financial statements and the reported amounts of revenues and expenses during
the reporting period. Actual results could differ from those estimates. The
unaudited pro forma combined condensed results of operations are not indicative
of the operating results that would have been achieved if the merger had been
consummated on January 1, 1996, nor are they necessarily indicative of future
operating results.

  The unaudited pro forma combined condensed balance sheet gives effect to the
merger as if it had occurred on March 31, 1999 by combining the balance sheets
of each of AK Holding and Armco at March 31, 1999. The unaudited pro forma
combined condensed statements of continuing operations give effect to the
merger as if it had occurred on January 1, 1996.

                                       67
<PAGE>

               UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS
                            OF CONTINUING OPERATIONS

                      For the Year Ended December 31, 1996
                (dollars in millions, except per share amounts)

<TABLE>
<CAPTION>
                         AK Holding   Armco     Combined     Total      Pro Forma
                         Historical Historical Historical Adjustments   Combined
                         ---------- ---------- ---------- -----------   ---------
<S>                      <C>        <C>        <C>        <C>           <C>
Net sales...............  $2,301.8   $1,724.0   $4,025.8    $(29.3)(1)  $3,996.5
Operating costs:
  Cost of products
   sold.................   1,846.5    1,548.4    3,394.9     (56.3)(2)   3,314.3
                                                             (24.3)(1)
  Selling and
   administrative
   expenses.............     114.7       92.1      206.8      (2.4)(2)     204.4
  Depreciation..........      76.1                  76.1      58.7 (2)     134.8
  Special charges.......                  8.8        8.8                     8.8
                          --------   --------   --------                --------
    Total Operating
     costs..............   2,037.5    1,649.3    3,686.6                 3,662.3
Operating profit........     264.5       74.7      339.2                   334.2
Interest income.........                 10.1       10.1     (10.1)(3)
Interest expense........      39.8       36.3       76.1                    76.1
Other income............      12.3                  12.3      10.1 (3)      22.4
Sundry other, net.......                (21.1)     (21.1)                  (21.1)
                          --------   --------   --------                --------
Income before income
 taxes..................     237.0       27.4      264.4                   259.4
Income tax provision....      91.1        1.4       92.5      72.2 (4)     162.7
                                                              (2.0)(1)
Minority interest.......                                       8.1 (5)       8.1
                          --------   --------   --------                --------
Income from continuing
 operations.............  $  145.9   $   26.0   $  171.9                $   88.6
                          ========   ========   ========                ========
Income per share of
 common stock from
 continuing operations:*
  Basic**...............  $   2.57   $   0.08                           $   0.82 (6)
                          ========   ========                           ========
  Diluted...............  $   2.35   $   0.08                           $   0.90 (6)
                          ========   ========                           ========
Weighted average number
 of shares of common
 stock (in thousands):*
  Basic.................    52,400    106,600                             82,497 (6)
                          ========   ========                           ========
  Diluted...............    62,100    106,600                             98,295 (6)
                          ========   ========                           ========
</TABLE>
- --------
* AK Holding Historical restated for a two-for-one common stock split effective
November 17, 1997.

**$20.9 million of preferred dividends were excluded from the basic earnings
per share calculation.

   See accompanying notes to unaudited pro forma combined condensed financial
                                  information.

                                       68
<PAGE>

               UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS
                            OF CONTINUING OPERATIONS

                      For the Year Ended December 31, 1997
                (dollars in millions, except per share amounts)

<TABLE>
<CAPTION>
                         AK Holding   Armco     Combined     Total      Pro Forma
                         Historical Historical Historical Adjustments   Combined
                         ---------- ---------- ---------- -----------   ---------
<S>                      <C>        <C>        <C>        <C>           <C>
Net sales...............  $2,440.5   $1,829.3   $4,269.8    $(32.4)(1)  $4,237.4
Operating costs:
  Cost of products
   sold.................   1,964.5    1,623.9    3,588.4     (59.0)(2)   3,499.7
                                                             (29.7)(1)
  Selling and adminis-
   trative expenses.....     114.8      100.0      214.8      (2.3)(2)     212.5
  Depreciation..........      79.8                  79.8      61.3 (2)     141.1
  Special charges.......
                          --------   --------   --------                --------
    Total Operating
     costs..............   2,159.1    1,723.9    3,883.0                 3,853.3

Operating profit........     281.4      105.4      386.8                   384.1

Interest income.........                 10.6       10.6     (10.6)(3)
Interest expense........      76.3       35.5      111.8                   111.8
Other income............      36.4                  36.4      10.6 (3)      47.0
Sundry other, net.......                 (1.1)      (1.1)                   (1.1)
                          --------   --------   --------                --------

Income before income
 taxes..................     241.5       79.4      320.9                   318.2

Income tax provision....      90.6        2.3       92.9      41.7 (4)     133.5
                                                              (1.1)(1)
Minority interest.......                                       8.1 (5)       8.1
                          --------   --------   --------                --------

Income from continuing
 operations.............  $  150.9   $   77.1   $  228.0                $  176.6
                          ========   ========   ========                ========
Income per share of
 common stock from
 continuing operations:
  Basic*................  $   2.59   $   0.55                           $   1.86 (6)
                          ========   ========                           ========
  Diluted...............  $   2.43   $   0.55                           $   1.79 (6)
                          ========   ========                           ========

Weighted average number
 of shares of common
 stock (in thousands):
  Basic.................    55,200    107,000                             85,398 (6)
                          ========   ========                           ========
  Diluted...............    62,000    125,300                             98,393 (6)
                          ========   ========                           ========
</TABLE>
- --------
* $17.5 million of preferred dividends were excluded from the basic earnings
  per share calculation.

   See accompanying notes to unaudited pro forma combined condensed financial
                                  information.

                                       69
<PAGE>

               UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS
                            OF CONTINUING OPERATIONS

                      FOR THE YEAR ENDED DECEMBER 31, 1998

                (DOLLARS IN MILLIONS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                          AK HOLDING   ARMCO     COMBINED     TOTAL      PRO FORMA
                          HISTORICAL HISTORICAL HISTORICAL ADJUSTMENTS   COMBINED
                          ---------- ---------- ---------- -----------   ---------
<S>                       <C>        <C>        <C>        <C>           <C>
Net sales...............   $2,393.6   $1,706.5   $4,100.1    $(23.2) (1) $4,076.9
Operating costs:
  Cost of products
   sold.................    1,963.4    1,503.1    3,466.5     (60.7) (2)  3,340.2
                                                              (26.8) (1)
                                                              (38.8) (7)
  Selling and adminis-
   trative expenses.....      118.8       95.8      214.6      (2.6) (2)    212.0
  Depreciation..........       97.8                  97.8      63.3  (2)    161.1
  Special charges.......
                           --------   --------   --------                --------
    Total Operating
     costs..............    2,180.0    1,598.9    3,778.9                 3,713.3
Operating profit........      213.6      107.6      321.2                   363.6
Interest income.........                   9.0        9.0      (9.0) (3)
Interest expense........       56.0       28.9       84.9                    84.9
Other income............       18.6                  18.6       9.0  (3)     27.6
Sundry other, net.......                             27.7                    27.7
                           --------   --------   --------                --------
Income before income
 taxes..................      176.2      115.4      291.6                   334.0
Income tax provision....       61.7        5.8       67.5      36.0  (4)    120.0
                                                               15.1  (7)
                                                                1.4  (1)
Minority interest.......                                        8.1  (5)      8.1
                           --------   --------   --------                --------
Income from continuing
 operations.............   $  114.5   $  109.6   $  224.1                $  205.9
                           ========   ========   ========                ========
Income per share of com-
 mon stock from continu-
 ing operations:
  Basic*................   $   1.93   $   0.85                           $   2.19 (6)
                           ========   ========                           ========
  Diluted...............   $   1.92   $   0.81                           $   2.14 (6)
                           ========   ========                           ========
Weighted average number
 of shares of common
 stock (in thousands):
  Basic.................     59,300    107,800                             89,688 (6)
                           ========   ========                           ========
  Diluted...............     59,600    126,200                             96,178 (6)
                           ========   ========                           ========
</TABLE>
- --------
* $9.8 million of preferred dividends were excluded from the basic earnings per
  share calculation.

   See accompanying notes to unaudited pro forma combined condensed financial
                                  information.


                                       70
<PAGE>

               UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS
                            OF CONTINUING OPERATIONS

                For the Three Month Period Ended March 31, 1998
                (dollars in millions, except per share amounts)

<TABLE>
<CAPTION>
                         AK Holding   Armco     Combined     Total      Pro Forma
                         Historical Historical Historical Adjustments   Combined
                         ---------- ---------- ---------- -----------   ---------
<S>                      <C>        <C>        <C>        <C>           <C>
Net sales...............   $588.2    $ 447.7    $1,035.9    $ (9.2)(1)  $1,026.7
Operating costs:
  Cost of products
   sold.................    483.6      404.4       888.0     (15.5)(2)     857.7
                                                              (5.0)(1)
                                                              (9.8)(7)
  Selling and
   administrative
   expenses.............     29.2       22.0        51.2      (0.6)(2)      50.6
  Depreciation..........     21.2                   21.2      16.1 (2)      37.3
  Special charges.......
                           ------    -------    --------                --------
    Total Operating
     costs..............    534.0      426.4       960.4                   945.6
Operating profit........     54.2       21.3        75.5                    81.1
Interest income.........                 2.5         2.5      (2.5)(3)
Interest expense........     15.7        7.6        23.3                    23.3
Other income............      6.9                    6.9       2.5 (3)       9.4
Sundry other, net.......                 5.9         5.9                     5.9
                           ------    -------    --------                --------
Income before income
 taxes..................     45.4       22.1        67.5                    73.1
Income tax provision....     17.0        1.8        18.8       6.2 (4)      27.2
                                                               3.8 (7)
                                                              (1.6)(1)
Minority interest.......                                       2.0 (5)       2.0
                           ------    -------    --------                --------
Income from continuing
 operations.............   $ 28.4    $  20.3    $   48.7                $   43.9
                           ======    =======    ========                ========
Income per share of
 common stock from
 continuing operations:
  Basic*................   $ 0.47    $  0.15                            $   0.46 (6)
                           ======    =======                            ========
  Diluted...............   $ 0.47    $  0.15                            $   0.45 (6)
                           ======    =======                            ========
Weighted average number
 of shares of common
 stock (in thousands):
  Basic.................   59,900    107,400                              90,288 (6)
                           ======    =======                            ========
  Diluted...............   60,200    125,700                              96,776 (6)
                           ======    =======                            ========
</TABLE>
- --------
* $2.5 million of preferred dividends were excluded from the basic earnings per
share calculation.

   See accompanying notes to unaudited pro forma combined condensed financial
                                  information.

                                       71
<PAGE>

               UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS
                            OF CONTINUING OPERATIONS

                For the Three Month Period Ended March 31, 1999
                (dollars in millions, except per share amounts)

<TABLE>
<CAPTION>
                         AK Holding   Armco     Combined     Total      Pro Forma
                         Historical Historical Historical Adjustments   Combined
                         ---------- ---------- ---------- -----------   ---------
<S>                      <C>        <C>        <C>        <C>           <C>
Net sales...............   $632.2    $ 407.9    $1,040.1    $ (5.2)(1)  $1,034.9
Operating costs:
  Cost of products
   sold.................    521.5      353.7       875.2     (16.1)(2)     852.0
                                                              (7.7)(1)
                                                               0.6 (7)
  Selling and
   administrative
   expenses.............     30.2       25.9        56.1      (0.8)(2)      55.3
  Depreciation..........     33.2                   33.2      16.9 (2)      50.1
  Special charges.......
                           ------    -------    --------                --------
    Total Operating
     costs..............    584.9      379.6       964.5                   957.4
Operating profit........     47.3       28.3        75.6                    77.5
Interest income.........                 2.4         2.4      (2.4)(3)
Interest expense........     24.7        5.8        30.5                    30.5
Other income............      3.2                    3.2       2.4 (3)       5.6
Sundry other, net.......                 4.7         4.7                     4.7
                           ------    -------    --------                --------
Income before income
 taxes..................     25.8       29.6        55.4                    57.3
Income tax provision....     (1.8)       4.4         2.6       6.9 (4)      10.3
                                                               1.0 (1)
                                                              (0.2)(7)
Minority interest.......                                       2.0 (5)       2.0
                           ------    -------    --------                --------
Income from continuing
 operations.............   $ 27.6    $  25.2    $   52.8                $   45.0
                           ======    =======    ========                ========
Income per share of
 common stock from
 continuing operations:
  Basic*................   $ 0.47    $  0.19                            $   0.47(6)
                           ======    =======                            ========
  Diluted...............   $ 0.46    $  0.18                            $   0.47(6)
                           ======    =======                            ========
Weighted average number
 of shares of common
 stock (in thousands):
  Basic.................   59,200    108,400                              89,809(6)
                           ======    =======                            ========
  Diluted...............   59,700    126,800                              96,733(6)
                           ======    =======                            ========
</TABLE>
- --------
* $2.5 million of preferred dividends were excluded from the basic earnings per
share calculation.




   See accompanying notes to unaudited pro forma combined condensed financial
                                  information.

                                       72
<PAGE>

             UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEETS
                               At March 31, 1999
                             (dollars in millions)
<TABLE>
<CAPTION>
                          AK Holding   Armco     Combined   Pro Forma       Pro Forma
         ASSETS           Historical Historical Historical Adjustments      Combined
         ------           ---------- ---------- ---------- ------------     ---------
<S>                       <C>        <C>        <C>        <C>              <C>
Current Assets:
  Cash and cash
   equivalents..........   $  498.2   $  145.5   $  643.7    $(119.0) (8)   $   504.7
                                                               (20.0) (9)
  Short-term
   investments..........                  10.7       10.7                        10.7
  Accounts receivable,
   net..................      314.5      190.9      505.4                       505.4
  Inventories, net......      390.6      264.3      654.9       (5.2) (10)      649.7
  Other.................       17.0       12.2       29.2       (9.2) (11)       20.0
                           --------   --------   --------                   ---------
    Total Current
     Assets.............    1,220.3      623.6    1,843.9                     1,690.5
                           --------   --------   --------                   ---------
Property, plant and
 equipment..............    3,016.6    1,341.7    4,358.3                     4,358.3
Less accumulated
 depreciation...........     (714.8)    (730.9)  (1,445.7)                   (1,445.7)
                           --------   --------   --------                   ---------
  Property, plant and
   equipment, net.......    2,301.8      610.8    2,912.6                     2,912.6
                           --------   --------   --------                   ---------
Investment in AFSG......                  85.6       85.6                        85.6
Other investments, net..                  26.3       26.3      (26.3) (13)
Prepaid pension.........      168.8                 168.8      (38.2) (11)      130.6
Deferred taxes..........                 312.8      312.8      (65.1) (11)      497.7
                                                               250.8  (4)
                                                                 0.2  (7)
                                                                (1.0) (10)
Goodwill................                 127.1      127.1                       127.1
Other...................       80.5       21.6      102.1       26.3  (13)      128.4
                           --------   --------   --------                   ---------
    Total Assets........   $3,771.4   $1,807.8   $5,579.2                    $5,572.5
                           ========   ========   ========                   =========
    LIABILITIES AND
  STOCKHOLDERS' EQUITY
Current Liabilities:
  Accounts and notes
   payable..............   $  279.4   $  130.5   $  409.9                   $   409.9
  Accrued salaries and
   wages................                                     $  67.5  (12)       67.5
  Employment related
   liabilities..........                 119.9      119.9     (119.9) (12)
  Other accruals........      208.8       53.2      262.0      (13.0) (12)      249.0
  Current portion of
   deferred taxes.......       20.4                  20.4       (9.2) (11)       11.2
  Current potion of
   long-term debt.......      325.0        5.9      330.9                       330.9
  Current portion of
   pension obligation...                                         1.5  (12)        1.5
  Current portion of
   postretirement
   benefit obligation...                                        63.9  (12)       63.9
                           --------   --------   --------                   ---------
    Total Current
     Liabilities........      833.6      309.5    1,143.1                     1,133.9
                           --------   --------   --------                   ---------
Noncurrent Liabilities:
  Long-term debt........    1,280.0      250.5    1,530.5                     1,530.5
  Long-term pension
   obligation...........                                        37.6  (12)
                                                               (38.2) (11)
                                                                 0.6  (7)
  Long-term
   postretirement
   benefit obligation...      578.2                 578.2      833.4  (12)    1,411.6
  Long-term employee
   benefit liabilities..                 889.7      889.7     (889.7) (12)
  Deferred taxes........       65.1                  65.1      (65.1) (11)
  Other liabilities.....       61.6      158.9      220.5       18.7  (12)      239.2
  Commitments and
   contingencies........
                           --------   --------   --------                   ---------
    Total Noncurrent
     Liabilities........    1,984.9    1,299.1    3,284.0                     3,181.3
                           --------   --------   --------                   ---------
    Total Liabilities...    2,818.5    1,608.6    4,427.1                     4,315.2
                           --------   --------   --------                   ---------
Stockholders Equity:
  Preferred stock, Class
   A....................                 137.6      137.6       (7.2) (8)       130.4
                                                              (130.4) (8)
                                                               130.4  (8)
  Preferred stock, Class
   B ...................                  48.3       48.3      (48.3) (8)
  Common stock..........        0.6        1.1        1.7       (1.1) (8)         0.9
                                                                 0.3  (8)
  Additional paid-in-
   capital..............      725.9      975.9    1,701.8     (975.9) (8)     1,636.6
                                                               914.3  (8)
                                                                (3.6) (14)
  Treasury stock........      (88.2)                (88.2)                      (88.2)
  Retained
   earnings/(deficit)...      313.3     (957.9)    (644.6)      (1.1) (8)      (421.5)
                                                               250.8  (4)
                                                                (6.2) (10)
                                                                (0.4) (7)
                                                               (20.0) (9)
  Accumulated other
   comprehensive income
   (loss)...............        1.3                   1.3       (2.2) (14)       (0.9)
  Other.................                  (5.8)      (5.8)       5.8  (14)
                           --------   --------   --------                   ---------
  Total Stockholders'
   Equity...............      952.9      199.2    1,152.1                     1,257.3
                           --------   --------   --------                   ---------
  Total Liabilities and
   Stockholders'
   Equity...............   $3,771.4   $1,807.8   $5,579.2                    $5,572.5
                           ========   ========   ========                   =========
</TABLE>
   See accompanying notes to unaudited pro forma combined condensed financial
                                  information.

                                       73
<PAGE>

                          NOTES TO UNAUDITED PRO FORMA
                    COMBINED CONDENSED FINANCIAL INFORMATION

 (1) Represents the elimination of sales between AK Holding and Armco.
 (2) Represents a reclassification of depreciation expense to conform the
     presentation of Armco results to that of AK Holding.
 (3) Represents a reclassification of interest income to conform the
     presentation of Armco results to that of AK Holding.
 (4) Represents an adjustment to the deferred tax asset and income tax
     provision as a result of the merger. Deferred tax assets have been
     adjusted based upon a revised assessment of the expected realization of
     future tax benefits. The income tax provision has been adjusted to reflect
     the operations of the combined company.
 (5) Represents a reclassification of Armco's dividends on preferred stock to a
     component of income from continuing operations to conform the presentation
     of Armco results to that of AK Holding.
 (6) The pro forma combined per share amounts are based upon the combined
     weighted average of AK Holding and Armco common stock outstanding for all
     periods presented based upon Armco stockholders receiving 0.2836 of a
     share of AK Holding common stock for each share of Armco common stock
     held.
 (7) Represents an adjustment necessary to conform the results of AK Holding's
     method of accounting for pension and postretirement benefits to that of
     Armco as a result of Armco's change in accounting in 1998. Prior to 1998,
     AK Steel and Armco were both amortizing unrecognized gains and losses on
     pensions and postretirement benefits using the minimum amortization
     approach under SFAS 87 and SFAS 106. In 1998, Armco changed its
     amortization method to provide for immediate recognition into income of
     all gains and losses in excess of the 10 percent corridor. Gains and
     losses that fall within the 10 percent corridor are amortized over the
     remaining service life of active participants. We believe that the
     amortization method used by Armco is the preferable method because it will
     accelerate the recognition into income of events that have occurred. This
     change will have a continuing impact on the combined company and may
     increase the sensitivity of its results of operations in periods of market
     volatility.
 (8) Represents the redemption of the Armco $2.10 Class A series and Class B
     series of preferred stock, the conversion of the Armco $3.625 Class A
     series of preferred stock to an identical series of AK Holding preferred
     stock, and the conversion of Armco common stock into AK Holding common
     stock and reflects the impact of pro forma adjustments.

 (9) AK Holding estimates it will incur direct transaction costs of
     approximately $20.0 million associated with the merger. Those costs
     consist primarily of investment banking, legal, accounting, printing, and
     regulatory filing fees. The unaudited pro forma combined condensed balance
     sheet reflects such expenses as if they had been paid as of March 31,
     1999. Pro forma net income and earnings per share do not reflect these
     one-time transaction costs. In addition, as a result of the merger, AK
     Holding estimates it will incur additional one-time charges to the results
     of operations of the combined company that could range from $230.0 million
     to $275.0 million. These special charges were not included in the
     unaudited pro forma combined condensed statements of operations and
     balance sheet and are estimated as follows:

<TABLE>
<CAPTION>
                                                                     Range
                                                               -----------------
     <S>                                                       <C>    <C> <C>
     Facilities............................................... $ 70.0 --  $ 85.0
     Employee related.........................................  120.0 --   140.0
     Change in control........................................   40.0 --    50.0
                                                               ------     ------
         Total................................................ $230.0 --  $275.0
</TABLE>

      AK Holding is still developing the details of these estimated one-time
      special charges. Once the appropriate accounting criteria are met, these
      charges will recorded in AK Holding's results of operations.
(10)  Represents the elimination of the profit on sales between AK Holding and
      Armco included in ending inventory.
(11)  Represents a reclassification necessary to net the deferred tax and
      pension assets and liabilities.

                                       74
<PAGE>

(12) Represents the reclassification of employment-related liabilities and
     long-term employee benefit liabilities to conform the presentation of
     Armco results to that of AK Holding.
(13) Represents a reclassification of other investments, net to conform the
     presentation of Armco results to that of AK Holding.
(14) Represents a reclassification of other stockholders' equity to conform the
     presentation of Armco results to those of AK Holding.

                                       75
<PAGE>





                                     [LOGO]

                              AK Steel Corporation





<PAGE>

                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

Item 20. Indemnification of Directors and Officers

  AK Steel Corporation and AK Steel Holding Corporation ("Holding") are each
Delaware corporations. Subsection (b)(7) of Section 102 of the Delaware
General Corporation Law (the "DGCL"), enables a corporation in its original
certificate of incorporation or an amendment thereto to eliminate or limit the
personal liability of a director to the corporation or its stockholders for
monetary damages for violations of the director's fiduciary duty, except (i)
for any breach of the director's duty of loyalty to the corporation or its
stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) pursuant to
Section 174 of the DGCL (providing for liability of directors for unlawful
payment of dividends or unlawful stock purchases or redemptions) or (iv) for
any transaction from which a director derived an improper personal benefit.
The Certificate of Incorporation of each of AK Steel and Holding has
eliminated the personal liability of its directors to the fullest extent
permitted by law.

  Subsection (a) of Section 145 of the DGCL empowers a corporation to
indemnify any director or officer, or former director or officer, who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative
or investigative (other than an action by or in the right of the corporation)
by reason of the fact that such person is or was a director or officer of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise, against expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred in connection with such action, suit or proceeding
provided that such director or officer acted in good faith in a manner
reasonably believed to be in, or not opposed to, the best interests of the
corporation, and, with respect to any criminal action or proceeding, provided
further that such director or officer had no reasonable cause to believe his
conduct was unlawful.

  Subsection (b) of Section 145 empowers a corporation to indemnify any
director or officer, or former director or officer, who was or is a party or
is threatened to be made a party to any threatened, pending or completed
action or suit by or in the right of the corporation to procure a judgment in
its favor by reason of the fact that such person acted in any of the
capacities set forth above, against expenses (including attorneys' fees)
actually and reasonably incurred in connection with the defense or settlement
of such action or suit provided that such director or officer acted in good
faith and in a manner he reasonably believed to be in, or not opposed to, the
best interests of the corporation, except that no indemnification may be made
in respect of any claim, issue or matter as to which such director or officer
shall have been adjudged to be liable to the corporation unless and only to
the extent that the Court of Chancery or the court in which such action or
suit was brought shall determine upon application that, despite the
adjudication of liability but in view of all of the circumstances of the case,
such director or officer is fairly and reasonably entitled to indemnity for
such expenses which the Court of Chancery or such other court shall deem
proper.

  Section 145 further provides that to the extent a director or officer of a
corporation has been successful in the defense of any action, suit or
proceeding referred to in subsections (a) or (b) or in the defense of any
claim, issue or matter therein, he shall be indemnified against expenses
(including attorneys' fees) actually and reasonably incurred by him in
connection therewith; that indemnification and advancement of expenses
provided for, by, or granted pursuant to, Section 145 shall not be deemed
exclusive of any other rights to which the indemnified party may be entitled;
and empowers the corporation to purchase and maintain insurance on behalf of
any person who is or was a director or officer of the corporation, or is or
was serving at the request of the corporation as a director, officer, employee
or agent of another corporation, partnership, joint venture, trust or other
enterprise against any liability asserted against him or incurred by him in
any such capacity, or arising out of his status as such, whether or not the
corporation would have the power to indemnify him against such liabilities
under Section 145.

                                     II-1
<PAGE>

  Article Seven of the Certificate of Incorporation of each of AK Steel and
Holding states that the corporation shall indemnify any person who was or is a
party or is threatened to be made a party to, or testifies in, any threatened,
pending, or completed action, suit or proceeding, whether civil, criminal,
administrative or investigative in nature, by reason of the fact that such
person is or was a director, officer or employee of the corporation, or is or
was serving at the request of the corporation as a director, officer or
employee of another corporation, partnership, joint venture, trust or other
enterprise, against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by him in
connection with such action, suit or proceeding to the full extent permitted
by law, and the corporation may adopt by-laws or enter into agreements with
any such person for the purpose of providing such indemnification.

Item 21. Exhibits and Financial Statement Schedules.

 (a) Exhibits

<TABLE>
<CAPTION>
      Exhibit
      Number                                  Description
      -------                                 -----------
      <C>     <S>
      4.1     --Indenture, dated as of December 17, 1996 (the "1996 Indenture"),
               relating to AK Steel's 9 1/8% Senior Notes Due 2006 (including form of
               notes) (incorporated herein by reference to Exhibit 4.1 to AK Steel's
               Registration Statement on Form S-4, No. 333-19781 ("Registration No. 333-
               19781")).
      4.2     --Indenture, dated as of February 10, 1999, relating to AK Steel's 7 7/8%
               Senior Notes Due 2009 (incorporated herein by reference to Exhibit 1 to
               Holding's Current Report on Form 8-K dated February 17, 1999.
      4.3     --Form of Note Purchase Agreement, dated as of December 17, 1996, with
               respect to AK Steel's Senior Secured Notes Due 2004 (incorporated herein
               by reference to Exhibit 4.5 to Registration No. 333-19781).
</TABLE>

<TABLE>
      <S>   <C>
      4.4   --Form of First Supplemental Indenture to Indenture dated as of December
             17, 1996, relating to AK Steel's 9 1/8% Senior Notes Due 2006.**
      4.5   --Form of First Supplemental Indenture to Indenture dated as of February
             10, 1999, relating to AK Steel's 7 7/8% Senior Notes Due 2009.**
       5    --Opinion of Weil, Gotshal & Manges LLP.*
      12    --Ratio of Earnings to Combined Fixed Charges.*
      23.1  --Consent of Deloitte & Touche LLP (auditors for AK Steel).**
      23.2  --Consent of Weil, Gotshal & Manges LLP (included in Exhibit 5).*
      23.3  --Consent of Deloitte & Touche LLP (auditors for Armco Inc.)**
      24    --Power of Attorney (included on signature pages).
      25    --Statement of Eligibility on Form T-1 of Fifth Third Bank.*
      99.1  --Form of Letter of Transmittal.*
      99.2  --Form of Notice of Guaranteed Delivery.*
</TABLE>
- --------
 * Previously filed.
** Filed herewith.

 (b) Schedules

  All schedules are omitted as the required information is presented in
Holding's consolidated financial statements or related notes or such schedules
are not applicable.

Item 22. Undertakings.

  (a) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the registrants pursuant to the foregoing provisions, or otherwise, the
registrants have been advised that in the opinion of the Securities and
Exchange Commission such

                                     II-2
<PAGE>

indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by a registrant of expenses
incurred or paid by a director, officer or controlling person of that
registrant in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with
the securities being registered, the registrants will, unless in the opinion
of their counsel the matter has been settled by controlling precedent, submit
to a court of appropriate jurisdiction the question whether such
indemnification is against public policy as expressed in the Act and will be
governed by the final adjudication of such issue.

  (b) Each of the undersigned registrants hereby undertakes to respond to
requests for information that is incorporated by reference into the Prospectus
pursuant to Item 4, 10(b), 11 or 13 of this form, within one business day of
receipt of such request, and to send the incorporated documents by first class
mail or other equally prompt means. This includes information contained in
documents filed subsequent to the effective date of the Registration Statement
through the date of responding to the request.

  (c) Each of the undersigned registrants hereby undertakes to supply by means
of a post-effective amendment all information concerning a transaction, and
the company being acquired involved therein, that was not the subject of and
included in the Registration Statement when it became effective.

  (d) Each of the undersigned registrants hereby undertakes:

    (1) To file, during any period in which offers or sales are being made, a
  post-effective amendment to this registration statement:

      (i) To include any prospectus inquired by Section 10(a)(3) of the
    Securities Act of 1933;

      (ii) To reflect in the prospectus any facts or events arising after
    the effective date of the registration statement (or the most recent
    post-effective amendment thereof) which, individually or in the
    aggregate, represent a fundamental change in the information set forth
    in the registration statement. Notwithstanding the foregoing, any
    increase or decrease in volume of securities offered (if the total
    dollar value of securities offered would not exceed that which was
    registered) and any deviation from the low or high end of the estimated
    maximum offering range may be reflected in the form of prospectus filed
    with the Commission pursuant to Rule 424(b) if, in the aggregate, the
    changes in volume and price represent no more than a 20 percent change
    in the maximum aggregate offering price set forth in the "Calculation
    of Registration Fee" table in the effective registration statement;

      (iii) To include any material information with respect to the plan of
    distribution not previously disclosed in the registration statement or
    any material change to such information in the registration statement;

  provided, however, that paragraphs (d)(l)(i) and (d)(l)(ii) do not apply if
  the registration statement is on Form S-3, Form S-8 or Form F-3, and the
  information required to be included in a post-effective amendment by those
  paragraphs is contained in periodic reports filed with or furnished to the
  Commission by the registrant pursuant to Section 13 or 15(d) of the
  Securities Exchange Act of 1934 that are incorporated by reference in the
  registration statement.

    (2) That for purposes of determining any liability under the Securities
  Act of 1933, each such post-effective amendment shall be deemed to be a new
  registration statement relating to the securities offered therein, and the
  offering of such securities at that time shall be deemed to be the initial
  bona fide offering thereof.

    (3) To remove from registration by means of a post-effective amendment
  any of the securities being registered which remain unsold at the
  termination of the offering.


                                     II-3
<PAGE>

                                   SIGNATURES

  Pursuant to the requirements of the Securities Act of 1933, as amended, AK
Steel Corporation has duly caused this Registration Statement to be signed on
its behalf by the undersigned, thereunto duly authorized, in the City of
Middletown, State of Ohio.

                                          AK STEEL CORPORATION
Date: August 2, 1999

                                               /s/ James L. Wainscott
                                          By: _________________________________
                                                    James L. Wainscott
                                                 Vice President, Treasurer
                                                and Chief Financial Officer

              Signature                         Title                Date

                  *                     Chairman and Chief      August 2, 1999
- -------------------------------------    Executive Officer
       Richard M. Wardrop, Jr.           (Principal
                                         Executive Officer)

                  *                     Vice President,
- -------------------------------------    Treasurer and Chief    August 2, 1999
         James L. Wainscott              Financial Officer
                                         (Principal
                                         Financial Officer)

                  *                     Controller
- -------------------------------------    (Principal             August 2, 1999
          Donald B. Korade               Accounting Officer)

                                              Director
- -------------------------------------
             Allen Born

                  *                           Director
- -------------------------------------                           August 2, 1999
           John A. Georges

                  *                           Director
- -------------------------------------                           August 2, 1999
         Dr. Bonnie G. Hill

                  *                           Director
- -------------------------------------                           August 2, 1999
          Robert H. Jenkins

                  *                           Director
- -------------------------------------                           August 2, 1999
          Lawrence A. Leser

     /s/ James L. Wainscott
*By: ________________________________
         James L. Wainscott
          Attorney-in-fact

                                      II-4
<PAGE>

              Signature                         Title                Date

                                              Director
- -------------------------------------
          Robert E. Northam

                  *                           Director
- -------------------------------------                           August 2, 1999
             Cyrus Tang

                  *                           Director
- -------------------------------------                           August 2, 1999
       James A. Thomson, Ph.D.

     /s/ James L. Wainscott
*By: ________________________________
         James L. Wainscott
          Attorney-in-fact


                                      II-5
<PAGE>

                                  SIGNATURES

  Pursuant to the requirements of the Securities Act of 1933, as amended, AK
Steel Holding Corporation has duly caused this Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Middletown, State of Ohio.

Date: August 2, 1999                      AK STEEL HOLDING CORPORATION

                                               /s/ James L. Wainscott
                                          By: _________________________________
                                                    James L. Wainscott
                                               Vice President, Treasurer and
                                                  Chief Financial Officer

              Signature                        Title                 Date

                  *                    Chairman and
- -------------------------------------   ChiefExecutive          August 2, 1999
       Richard M. Wardrop, Jr.          Officer (Principal
                                        Executive Officer)

                  *                    Vice President,
- -------------------------------------   Treasurer and Chief     August 2, 1999
         James L. Wainscott             Financial Officer
                                        (Principal
                                        Financial Officer)

                  *                    Controller
- -------------------------------------   (Principal              August 2, 1999
          Donald B. Korade              Accounting Officer)

                                             Director
- -------------------------------------
             Allen Born

                  *                          Director
- -------------------------------------                           August 2, 1999
           John A. Georges

                  *                          Director
- -------------------------------------                           August 2, 1999
         Dr. Bonnie G. Hill

                  *                          Director
- -------------------------------------                           August 2, 1999
          Robert H. Jenkins

                  *                          Director
- -------------------------------------                           August 2, 1999
          Lawrence A. Leser

                                             Director
- -------------------------------------
          Robert E. Northam

                  *                          Director
- -------------------------------------                           August 2, 1999
             Cyrus Tang

                  *                          Director
- -------------------------------------                           August 2, 1999
       James A. Thomson, Ph.D.

     /s/ James L. Wainscott
*By: ________________________________
         James L. Wainscott
          Attorney-in-fact


                                     II-6
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 Exhibit
 Number                                  Description
 -------                                 -----------
 <C>     <S>
 4.1     --Indenture, dated as of December 17, 1996 (the "1996 Indenture"),
          relating to AK Steel's 9 1/8% Senior Notes Due 2006 (including form of
          notes) (incorporated herein by reference to Exhibit 4.1 to AK Steel's
          Registration Statement on Form S-4, No. 333-19781 ("Registration No. 333-
          19781")).
 4.2     --Indenture, dated as of February 10, 1999, relating to AK Steel's 7 7/8%
          Senior Notes Due 2009 (incorporated herein by reference to Exhibit 1 to
          Holding's Current Report on Form 8-K dated February 17, 1999.
 4.3     --Form of Note Purchase Agreement, dated as of December 17, 1996, with
          respect to AK Steel's Senior Secured Notes Due 2004 (incorporated herein
          by reference to Exhibit 4.5 to Registration No. 333-19781).
 4.4     --Form of First Supplemental Indenture to Indenture dated as of December
          17, 1996, relating to AK Steel's 9 1/8% Senior Notes Due 2006.**
 4.5     --Form of First Supplemental Indenture to Indenture dated as of February
          10, 1999, relating to AK Steel's 7 7/8% Senior Notes Due 2009.**
  5      --Opinion of Weil, Gotshal & Manges LLP.*
 12      --Ratio of Earnings to Combined Fixed Charges.*
 23.1    --Consent of Deloitte & Touche LLP (auditors for AK Steel).**
 23.2    --Consent of Weil, Gotshal & Manges LLP (included in Exhibit 5).*
 23.3    --Consent of Deloitte & Touche LLP (auditors for Armco Inc.).**
 24      --Power of Attorney (included on signature pages).
 25      --Statement of Eligibility on Form T-1 of Fifth Third Bank.*
 99.1    --Form of Letter of Transmittal.*
 99.2    --Form of Notice of Guaranteed Delivery.*
</TABLE>
- --------
 *Previously filed.
**Filed herewith.

<PAGE>

                                                 DRAFT OF SUPPLEMENTAL INDENTURE

                                                                     EXHIBIT 4.4





                          FIRST SUPPLEMENTAL INDENTURE

                             Dated as of _____, 1999

         THIS FIRST SUPPLEMENTAL INDENTURE to the Indenture referred to below is
dated as of _____, 1999 (this "First Supplemental Indenture") among AK Steel
Corporation, a Delaware corporation ("AK Steel"), AK Steel Holding CORPORATION,
a Delaware corporation ("Holding"), and Fifth Third Bank, as successor trustee
to The Bank of New York (the "Trustee").

         AK Steel, Holding and the Trustee are parties to an Indenture, dated as
of December 17, 1996 (the "Indenture"), providing, among other things, for the
authentication, delivery and administration of AK Steel's 9-1/8% Senior Notes
due 2006 (the "Notes").

         AK Steel has solicited consents from Holders (as defined below) of the
Notes to certain amendments to the Indenture described in Article II hereof (the
"Proposed Amendments").

         Pursuant to Section 9.02 of the Indenture, the Holders of at least a
majority in principal amount of the outstanding Notes have consented in writing
to the Proposed Amendments.

         AK Steel has directed the Trustee to execute and deliver this First
Supplemental Indenture in accordance with the terms of the Indenture.

         In consideration of the foregoing premises, the parties mutually agree
as follows for the benefit of each other and for the equal and ratable benefit
of the Holders of the Notes:


                                   ARTICLE I

                         DEFINITIONS AND EFFECTIVENESS
                         -----------------------------

         Section 1.1 Definitions. Except as otherwise defined herein,
                     -----------
capitalized terms defined in the Indenture are used herein as therein defined.

         Section 1.2 Condition to Effectiveness. The Proposed Amendments will
                     --------------------------
become effective upon (the "Effective Time") the consummation of the merger
contemplated by the Agreement and Plan of Merger, dated as of May 20, 1999, as
it may be amended, among Holding, AK Steel and Armco Inc.


                                  ARTICLE II

                            AMENDMENTS TO INDENTURE
                            -----------------------

         Section 2.1 Amendments to Indenture. On and after the Effective Time,
                     -----------------------
the Indenture shall be amended as follows:

                  (a) Section 1.1 of the Indenture shall be amended to add the
         following definitions in proper alphabetical order:
<PAGE>

                           (i) "'domestic' means, with respect to any Person,
                  that such Person is organized and existing under the laws of
                  the United States, any State thereof or the District of
                  Columbia."; and

                           (ii) "'Restricted Subsidiary' means any Subsidiary of
                  AK Steel that AK Steel has not designated as a Non-Recourse
                  Subsidiary (or, if AK Steel has so designated such Subsidiary,
                  has thereafter removed such designation) pursuant to Section
                  4.22(a) hereof. For the avoidance of ambiguity, a Restricted
                  Subsidiary is any Subsidiary other than a Non-Recourse
                  Subsidiary."

                  (b) The definition of "Consolidated Net Income" contained in
         Section 1.1 of the Indenture shall be amended as follows:

                           (i) the word "Restricted" shall be inserted
                  immediately before the first reference to the word
                  "Subsidiary" in clause (a) thereof;

                           (ii) the parenthetical clause "(other than a
                  Non-Recourse Subsidiary)" shall be deleted in clause (a)
                  thereof;

                           (iii) the word "and" at the end of clause (e) thereof
                  shall be deleted;

                           (iv) the text "; and" shall replace the "." at the
                  end of clause (f) thereof; and

                           (v) a new clause (g) shall be inserted after clause
                  (f) thereof as follows:

                                    "(g) solely for purposes of Section 4.7
                           hereof, special charges, costs and other expenses
                           (including restructuring charges and associated
                           investment banking, legal, accounting, printing and
                           related fees and expenses) recorded by Holding, AK
                           Steel or any Restricted Subsidiary (and related tax
                           effects) in connection with the merger of Armco Inc.
                           with and into AK Steel pursuant to an Agreement and
                           Plan of Merger dated as of May 20, 1999, as it may be
                           amended, among Holding, AK Steel and Armco Inc. and
                           any other merger or other business combination
                           transaction involving Holding, AK Steel or any
                           Restricted Subsidiary, to the extent that such
                           charges, costs and other expenses are not permitted
                           under generally accepted accounting principles to be
                           capitalized and amortized over future periods, in
                           each case in respect of which Holding has delivered
                           to the Trustee an Officers' Certificate, made in good
                           faith by responsible financial or accounting Officers
                           of Holding, at the time such special charges, costs
                           and other expenses are recorded, setting forth in
                           reasonable detail such special charges, costs and
                           other expenses."

                  (c) The definition of "Guarantor Subsidiary" contained in
         Section 1.1 of the Indenture shall be amended in its entirety and
         replaced with the following:

                           "'Guarantor Subsidiary' means (a) any domestic
                             --------------------
                  Restricted Subsidiary or (b) any other Restricted Subsidiary
                  that is a Significant Subsidiary of which 80% or more of the
                  total voting power of Equity

                                       2
<PAGE>

                  Interests or other interests (including partnership interests)
                  entitled (without regard to the occurrence of any contingency)
                  to vote in the election of directors, managers or trustees
                  thereof is at the time owned or controlled, directly or
                  indirectly, through one or more intermediaries, or both, by AK
                  Steel, which in each case executes a supplement to this
                  Indenture pursuant to which such Restricted Subsidiary jointly
                  and severally unconditionally guarantees the due and punctual
                  payment and performance of the Obligations and assumes the
                  other obligations of a Guarantor Subsidiary pursuant to this
                  Indenture, in the manner provided by this Indenture."

                  (d) The definition of "Non-Recourse Subsidiary" in Section 1.1
         of the Indenture shall be amended in its entirety and replaced with the
         following:

                           "'Non-Recourse Subsidiary' means a Subsidiary of AK
                             -----------------------
                  Steel that is not a Restricted Subsidiary."

                  (e) The definition of "Permitted Credit Facility" or
         "Facilities" in Section 1.1 of the Indenture shall be amended by
         replacing the two references to the word "Guarantor" with the word
         "Restricted" therein.

                  (f) The definition of "Permitted Investments" contained in
         Section 1.1 of the Indenture shall be amended as follows:

                           (i) a ";" shall be inserted at the end of clause (d)
                  thereof;
                           (ii) each of the five references to the word
                  "Guarantor" in clauses (e) and (f) thereof shall be replaced
                  with the word "Restricted";

                           (iii) the word "and" at the end of clause (e) thereof
                  shall be deleted; and

                           (iv) the text "; and" shall be inserted at the end of
                  clause (f) thereof.

                  (g) The definition of "Wholly Owned Guarantor Subsidiary" in
         Section 1.1 of the Indenture shall be amended in its entirety and
         replaced with the following:

                           "'Wholly Owned Guarantor Subsidiary' means any Wholly
                             ---------------------------------
                  Owned Subsidiary that is a Restricted Subsidiary (whether or
                  not a Guarantor Subsidiary). For the avoidance of doubt, not
                  all Wholly Owned Guarantor Subsidiaries are required to be
                  Guarantor Subsidiaries."

                  (h) Section 4.5 of the Indenture shall be amended as follows:

                           (i) the reference to "(d)" in clause (c) thereof
                  shall be replaced by "(c)"; and

                           (ii) the words "in the ordinary course of business"
                  shall be deleted from clause (d) thereof.

                  (i) Section 4.7 of the Indenture shall be amended by inserting
         the word "Restricted" immediately before the first reference to the
         word "Subsidiary" therein.

                  (j) Section 4.11 of the Indenture shall be amended by
         inserting the word "Restricted" immediately before the first reference
         to the word "Subsidiary" therein.

                                       3
<PAGE>

                  (k) Section 4.12 of the Indenture shall be amended as follows:

                           (i) the words "in the ordinary course of business"
                  shall be deleted from clause (c) thereof; and

                           (ii) the word "Guarantor" shall be replaced by the
                  word "Restricted" in clause (e) thereof.

                  (l) Section 4.14 of the Indenture shall be amended by
         replacing the word "Guarantor" with the word "Restricted" therein.

                  (m) Section 4.15 of the Indenture shall be amended in its
         entirety and replaced with the following:

                           "SECTION 4.15. Lines of Business. AK Steel shall be
                  permitted to engage in any business, either directly or
                  through any Subsidiary, provided that AK Steel and its
                  Subsidiaries, taken as a whole, remain principally engaged in
                  the same business, or any business reasonably related thereto,
                  in which they were engaged on the date on which the Initial
                  Securities were originally issued."

                  (n) Section 4.18 of the Indenture shall be amended by
         replacing the word "Guarantor" with the word "Restricted" and by
         replacing each of the two references to the words "any Guarantor
         Subsidiary" with the words "such Restricted Subsidiary" therein.

                  (o) Section 4.19 of the Indenture shall be amended by
         replacing the word "Guarantor" with the word "Restricted" therein.

                  (p) Article 4 of the Indenture shall be amended by inserting
         after Section 4.21 thereof a new Section 4.22 as follows:

                           "SECTION 4.22. Designation of Non-Recourse
                                          ---------------------------
                  Subsidiaries and Restricted Subsidiaries. (a) AK Steel may
                  ----------------------------------------
                  designate any of its Subsidiaries (including an existing or
                  newly formed or acquired Subsidiary) as a Non-Recourse
                  Subsidiary if (i) such Subsidiary has total assets of $1,000
                  or less or (ii) such designation is effective immediately upon
                  such Person becoming a Subsidiary of either AK Steel or any of
                  its Restricted Subsidiaries. Unless so designated as a
                  Non-Recourse Subsidiary, any Person that becomes a Subsidiary
                  of AK Steel shall be classified as a Restricted Subsidiary.
                  Subject to Section 4.22(b) hereof, the designation as a
                  Non-Recourse Subsidiary may be removed. The designation of a
                  Non-Recourse Subsidiary or the removal of such designation in
                  compliance with Section 4.22(b) hereof shall be made by the
                  Board of Directors pursuant to a resolution delivered to the
                  Trustee and shall be effective as of the date specified in the
                  applicable resolution, which shall not be prior to the date
                  such resolution is delivered to the Trustee.

                           (b) AK Steel shall not, and shall not permit any of
                  its Restricted Subsidiaries to, take any action or enter into
                  any transaction or series of transactions that would result in
                  a Person becoming a Restricted Subsidiary (whether through an
                  acquisition, the removal of the designation

                                       4
<PAGE>

                  as a Non-Recourse Subsidiary or otherwise) unless, after
                  giving effect to such action, transaction or series of
                  transactions:

                                    (i) on a pro forma basis, AK Steel could
                           issue at least $1.00 of additional Debt pursuant to
                           the Consolidated EBITDA Coverage Ratio as set forth
                           in the first paragraph of Section 4.5 hereof;

                                    (ii) such Restricted Subsidiary could then
                           issue, pursuant to Section 4.6 hereof, all Debt as to
                           which it is obligated at such time;

                                    (iii) no Default or Event of Default would
                           occur or be continuing; and

                                    (iv) there exist no Liens with respect to
                           the property or assets of such Restricted Subsidiary
                           other than Liens permitted to be incurred under
                           Section 4.12 hereof.

                           (c) AK Steel shall not, and shall not permit any of
                  its Restricted Subsidiaries to, take any action or enter into
                  any transaction or series of transactions that would result in
                  any such Restricted Subsidiary ceasing to be a Subsidiary
                  (other than a merger or consolidation with AK Steel or another
                  Restricted Subsidiary) unless, after giving effect to such
                  action, transaction or series of transactions, either:

                                    (i) (A) neither AK Steel nor any of its
                           Affiliates (other than a Person that is an Affiliate
                           by virtue of its ownership of Equity Interests or
                           control of AK Steel) shall own any Equity Interests
                           of such former Restricted Subsidiary or any successor
                           in interest to the business thereof, and (B) there
                           shall not exist any Debt of such former Restricted
                           Subsidiary or any successor in interest to the
                           business thereof in favor of AK Steel or any of its
                           Restricted Subsidiaries; or

                                    (ii) AK Steel and its Restricted
                           Subsidiaries would be permitted to make a Restricted
                           Payment in the amount of the aggregate Investment
                           (excluding (A) any Investment to the extent of cash
                           or the Fair Market Value of property or assets other
                           than cash received by AK Steel or its Restricted
                           Subsidiary, as the case may be, in respect of or as a
                           repayment of such Investment, and (B) the amount of
                           Debt of such former Restricted Subsidiary received by
                           AK Steel or its Restricted Subsidiaries as part of
                           the consideration for the acquisition of the Equity
                           Interests or assets of such former Restricted
                           Subsidiary), if any, made in such former Restricted
                           Subsidiary after October 1, 1996."

                           (q) Section 5.1 of the Indenture shall be amended by
                  (i) inserting the word "Guarantor" immediately before the word
                  "Subsidiary" and (ii) deleting the parenthetical clause
                  "(other than a Non-Recourse Subsidiary)", in each case, in the
                  last paragraph thereof.

                           (r) Clause (a) of Section 10.4 of the Indenture shall
                  be amended as follows:

                                       5
<PAGE>

                                    (i) the word "Guarantor" shall be inserted
                           immediately before the first reference to the word
                           "Subsidiary" therein;

                                    (ii) the parenthetical clause "(other than a
                           Non-Recourse Subsidiary)" shall be deleted; and

                                    (iii) the words "become a Guarantor
                           Subsidiary with respect to the Securities by
                           executing and delivering" shall be deleted and
                           replaced with the words "execute and deliver"
                           therein.

         Section 2.2 Notification to Holders. AK Steel shall notify the Holders
                     -----------------------
in accordance with Section 9.02 of the Indenture of the execution of this First
Supplemental Indenture. Any failure of AK Steel to give such notice to all
Holders, or any defect therein, shall not impair or affect the validity of this
First Supplemental Indenture.

         Section 2.3 Receipt by Trustee. In accordance with Sections 9.6 and
                     ------------------
11.4 of the Indenture, the parties acknowledge that the Trustee has received an
Officers' Certificate and an Opinion of Counsel as conclusive evidence that this
First Supplemental Indenture complies with the applicable requirements of the
Indenture, including that the Proposed Amendments are authorized or permitted by
the Indenture.


                                  ARTICLE III

                                 MISCELLANEOUS
                                 -------------

         Section 3.1 Parties. Nothing expressed or mentioned herein is intended
                     -------
or shall be construed to give any Person, other than the Holders and the
Trustee, any legal or equitable right, remedy or claim under or in respect of
this First Supplemental Indenture or the Indenture or any provision herein or
therein contained.

         Section 3.2 Governing Law. The rights and duties of AK Steel, Holding
                     -------------
and the Trustee under this First Supplemental Indenture shall, pursuant to New
York General Obligations Law Section 5-1401, be governed by the laws of the
State of New York.

         Section 3.3 Separability Clause. In case any provision in this First
                     -------------------
Supplemental Indenture shall be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any way be
affected or impaired thereby.

         Section 3.4 Ratification of Indenture; First Supplemental Indenture
                     -------------------------------------------------------
Part of Indenture. Except as expressly supplemented hereby, the Indenture is in
- -----------------
all respects ratified and confirmed and all the terms, conditions, and
provisions thereof shall remain in full force and effect. This First
Supplemental Indenture shall form a part of the Indenture for all purposes, and
every Holder of Notes heretofore or hereafter authenticated and delivered shall
be bound hereby. The Trustee makes no representation or warranty as to the
validity or sufficiency of this First Supplemental Indenture.

         Section 3.5 Multiple Originals. The parties may sign any number of
                     ------------------
copies of this First Supplemental Indenture. Each signed copy shall be an
original, but all of them shall represent the same agreement. One signed copy is
enough to prove this First Supplemental Indenture.

                                       6
<PAGE>

         Section 3.6 Headings. The headings of the Articles and Sections of this
                     --------
First Supplemental Indenture have been inserted for convenience of reference
only, are not intended to be considered a part hereof and shall not modify or
restrict any of the terms or provisions hereof.

                                       7
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this First
Supplemental Indenture to be duly executed as of the date first written above.


                                         AK STEEL CORPORATION



                                         By:
                                             ---------------------------
                                         Name:
                                         Title:


                                         AK STEEL HOLDING CORPORATION,
                                         as Guarantor



                                         By:
                                             ---------------------------
                                         Name:
                                         Title:


                                         FIFTH THIRD BANK,
                                         as Trustee



                                         By:
                                             ---------------------------
                                         Name:
                                         Title:

                                       8

<PAGE>

                                                 DRAFT OF SUPPLEMENTAL INDENTURE

                                                                     EXHIBIT 4.5



                          FIRST SUPPLEMENTAL INDENTURE

                             Dated as of _____, 1999

         THIS FIRST SUPPLEMENTAL INDENTURE to the Indenture referred to below is
dated as of _____, 1999 (this "First Supplemental Indenture") among AK Steel
Corporation, a Delaware corporation ("AK Steel"), AK Steel Holding Corporation,
a Delaware corporation ("Holding") and Fifth Third Bank, as trustee (the
"Trustee").

         AK Steel, Holding and the Trustee are parties to an Indenture, dated as
of February 10, 1999 (the "Indenture"), providing among other things, for the
authentication, delivery and administration of AK Steel's 7-7/8% Senior Notes
due 2009 (the "Notes").

         AK Steel has solicited consents from Holders (as defined below) of the
Notes to certain amendments to the Indenture described in Article II hereof (the
"Proposed Amendments").

         Pursuant to Section 9.02 of the Indenture, the Holders of at least a
majority in principal amount of the outstanding Notes have consented in writing
to the Proposed Amendments.

         AK Steel has directed the Trustee to execute and deliver this First
Supplemental Indenture in accordance with the terms of the Indenture.

         In consideration of the foregoing premises, the parties mutually agree
as follows for the benefit of each other and for the equal and ratable benefit
of the Holders of the Notes:

                                    ARTICLE I

                          DEFINITIONS AND EFFECTIVENESS
                          -----------------------------

         Section 1.1 Definitions.  Except as otherwise  defined herein,
                     -----------
capitalized terms defined in the Indenture are used herein as therein defined.

         Section 1.2 Condition to Effectiveness. The Proposed Amendments will
                     --------------------------
become effective upon (the "Effective Time") the consummation of the merger
contemplated by the Agreement and Plan of Merger, dated as of May 20, 1999, as
it may be amended, among Holding, AK Steel and Armco Inc.


                                  ARTICLE II

                            AMENDMENTS TO INDENTURE
                            -----------------------

         Section 2.1 Amendments to Indenture. On and after the Effective Time,
                     -----------------------
the Indenture shall be amended as follows:

                  (a) Section 1.1 of the Indenture shall be amended to add the
         following definitions in proper alphabetical order:

                           (i) "'domestic' means, with respect to any Person,
                  that such Person is organized and existing under the laws of
                  the United States, any State thereof or the District of
                  Columbia."; and
<PAGE>

                           (ii) "'Restricted Subsidiary' means any Subsidiary of
                  AK Steel that AK Steel has not designated as a Non-Recourse
                  Subsidiary (or, if AK Steel has so designated such Subsidiary,
                  has thereafter removed such designation) pursuant to Section
                  4.22(a) hereof. For the avoidance of ambiguity, a Restricted
                  Subsidiary is any Subsidiary other than a Non-Recourse
                  Subsidiary."

                  (b) The definition of "Consolidated Net Income" contained in
         Section 1.1 of the Indenture shall be amended as follows:

                           (i) the word "Restricted" shall be inserted
                  immediately before the first reference to the word
                  "Subsidiary" in clause (a) thereof;

                           (ii) the parenthetical clause "(other than a
                  Non-Recourse Subsidiary)" shall be deleted in clause (a)
                  thereof;

                           (iii) the word "and" at the end of clause (e) thereof
                  shall be deleted;

                           (iv) the text "; and" shall replace the "." at the
                  end of clause (f) thereof; and

                           (v) a new clause (g) shall be inserted after clause
                  (f) thereof as follows:

                                 "(g) solely for purposes of Section 4.7 hereof,
                  special charges, costs and other expenses (including
                  restructuring charges and associated investment banking,
                  legal, accounting, printing and related fees and expenses)
                  recorded by Holding, AK Steel or any Restricted Subsidiary
                  (and related tax effects) in connection with the merger of
                  Armco Inc. with and into AK Steel pursuant to an Agreement and
                  Plan of Merger dated as of May 20, 1999, as it may be amended,
                  among Holding, AK Steel and Armco Inc. and any other merger or
                  other business combination transaction involving Holding, AK
                  Steel or any Restricted Subsidiary, to the extent that such
                  charges, costs and other expenses are not permitted under
                  generally accepted accounting principles to be capitalized and
                  amortized over future periods, in each case in respect of
                  which Holding has delivered to the Trustee an Officers'
                  Certificate, made in good faith by responsible financial or
                  accounting Officers of Holding, at the time such special
                  charges, costs and other expenses are recorded, setting forth
                  in reasonable detail such special charges, costs and other
                  expenses.".

                  (c) The definition of "Guarantor Subsidiary" contained in
         Section 1.1 of the Indenture shall be amended in its entirety and
         replaced with the following:

                           "'Guarantor Subsidiary' means (a) any domestic
                  Restricted Subsidiary or (b) any other Restricted Subsidiary
                  that is a Significant Subsidiary of which 80% or more of the
                  total voting power of Equity Interests or other interests
                  (including partnership interests) entitled (without regard to
                  the occurrence of any contingency) to vote in the election of
                  directors, managers or trustees thereof is at the time owned
                  or controlled, directly or indirectly, through one or more
                  intermediaries, or both, by AK Steel, which in each case
                  executes a supplement to this Indenture pursuant to which such
                  Restricted Subsidiary jointly and

                                       2
<PAGE>

                  severally unconditionally guarantees the due and punctual
                  payment and performance of the Obligations and assumes the
                  other obligations of a Guarantor Subsidiary pursuant to this
                  Indenture, in the manner provided by this Indenture."

                  (d) The definition of "Non-Recourse Subsidiary" in Section 1.1
         of the Indenture shall be amended in its entirety and replaced with the
         following:

                      "'Non-Recourse Subsidiary' means a Subsidiary of AK Steel
                  that is not a Restricted Subsidiary."

                  (e) The definition of "Permitted Credit Facility" or
         "Facilities" in Section 1.1 of the Indenture shall be amended by
         replacing the two references to the word "Guarantor" with the word
         "Restricted" therein.

                  (f) The definition of "Permitted Investments" contained in
         Section 1.1 of the Indenture shall be amended as follows:

                           (i) a ";" shall be inserted at the end of clause (d)
                  thereof;

                           (ii) each of the five references to the word
                  "Guarantor" in clauses (e) and (f) thereof shall be replaced
                  with the word "Restricted";

                           (iii) the word "and" at the end of clause (e) thereof
                  shall be deleted; and

                           (iv) the text "; and" shall be inserted at the end of
                  clause (f) thereof.

                  (g) The definition of "Wholly Owned Guarantor Subsidiary" in
         Section 1.1 of the Indenture shall be amended in its entirety and
         replaced with the following:

                           "'Wholly Owned Guarantor Subsidiary' means any Wholly
                  Owned Subsidiary that is a Restricted Subsidiary (whether or
                  not a Guarantor Subsidiary). For the avoidance of doubt, not
                  all Wholly Owned Guarantor Subsidiaries are required to be
                  Guarantor Subsidiaries."

                  (h) Section 4.7 of the Indenture shall be amended by inserting
         the word "Restricted" immediately before the first reference to the
         word "Subsidiary".

                  (i) Section 4.11 of the Indenture shall be amended by
         inserting the word "Restricted" immediately before the first reference
         to the word "Subsidiary" therein.

                  (j) Section 4.12 of the Indenture shall be amended by
         replacing the word "Guarantor" with the word "Restricted" in clause (e)
         thereof.

                  (k) Section 4.14 of the Indenture shall be amended by
         replacing the word "Guarantor" with the word "Restricted" therein.

                  (l) Section 4.15 of the Indenture shall be amended in its
         entirety and replaced with the following:

                           "SECTION 4.15. Lines of Business. AK Steel shall be
                  permitted to engage in any business, either directly or
                  through any Subsidiary, provided that AK Steel and its
                  Subsidiaries, taken as a whole, remain principally engaged in
                  the same business, or any business reasonably related thereto,
                  in which they were engaged on the date on which the Initial
                  Securities were originally issued."

                                       3
<PAGE>

                  (m) Section 4.18 of the Indenture shall be amended by
         replacing the word "Guarantor" with the word "Restricted" and by
         replacing each of the two references to the words "any Guarantor
         Subsidiary" with the words "such Restricted Subsidiary" therein.

                  (n) Section 4.19 of the Indenture shall be amended by
         replacing the word "Guarantor" with the word "Restricted" therein.

                  (o) Article 4 of the Indenture shall be amended by inserting
         after Section 4.21 thereof a new Section 4.22 as follows:


                           "SECTION 4.22. Designation of Non-Recourse
                                          ---------------------------
                  Subsidiaries and Restricted Subsidiaries. (a) AK Steel may
                  ----------------------------------------
                  designate any of its Subsidiaries (including an existing or
                  newly formed or acquired Subsidiary) as a Non-Recourse
                  Subsidiary if (i) such Subsidiary has total assets of $1,000
                  or less or (ii) such designation is effective immediately upon
                  such Person becoming a Subsidiary of either AK Steel or any of
                  its Restricted Subsidiaries. Unless so designated as a
                  Non-Recourse Subsidiary, any Person that becomes a Subsidiary
                  of AK Steel shall be classified as a Restricted Subsidiary.
                  Subject to Section 4.22(b) hereof, the designation as a
                  Non-Recourse Subsidiary may be removed. The designation of a
                  Non-Recourse Subsidiary or the removal of such designation in
                  compliance with Section 4.22(b) hereof shall be made by the
                  Board of Directors pursuant to a resolution delivered to the
                  Trustee and shall be effective as of the date specified in the
                  applicable resolution, which shall not be prior to the date
                  such resolution is delivered to the Trustee.


                           (b) AK Steel shall not, and shall not permit any of
                  its Restricted Subsidiaries to, take any action or enter into
                  any transaction or series of transactions that would result in
                  a Person becoming a Restricted Subsidiary (whether through an
                  acquisition, the removal of the designation as a Non-Recourse
                  Subsidiary or otherwise) unless, after giving effect to such
                  action, transaction or series of transactions:


                                    (i) on a pro forma basis, AK Steel could
                           issue at least $1.00 of additional Debt pursuant to
                           the Consolidated EBITDA Coverage Ratio as set forth
                           in the first paragraph of Section 4.5 hereof;


                                    (ii) such Restricted Subsidiary could then
                           issue, pursuant to Section 4.6 hereof, all Debt as to
                           which it is obligated at such time;


                                    (iii) no Default or Event of Default would
                           occur or be continuing; and

                                       4
<PAGE>

                                    (iv) there exist no Liens with respect to
                           the property or assets of such Restricted Subsidiary
                           other than Liens permitted to be incurred under
                           Section 4.12 hereof.


                           (c) AK Steel shall not, and shall not permit any of
                  its Restricted Subsidiaries to, take any action or enter into
                  any transaction or series of transactions that would result in
                  any such Restricted Subsidiary ceasing to be a Subsidiary
                  (other than a merger or consolidation with AK Steel or another
                  Restricted Subsidiary) unless, after giving effect to such
                  action, transaction or series of transactions, either:


                                    (i) (A) neither AK Steel nor any of its
                           Affiliates (other than a Person that is an Affiliate
                           by virtue of its ownership of Equity Interests or
                           control of AK Steel) shall own any Equity Interests
                           of such former Restricted Subsidiary or any successor
                           in interest to the business thereof, and (B) there
                           shall not exist any Debt of such former Restricted
                           Subsidiary or any successor in interest to the
                           business thereof in favor of AK Steel or any of its
                           Restricted Subsidiaries; or


                                    (ii) AK Steel and its Restricted
                           Subsidiaries would be permitted to make a Restricted
                           Payment in the amount of the aggregate Investment
                           (excluding (A) any Investment to the extent of cash
                           or the Fair Market Value of property or assets other
                           than cash received by AK Steel or its Restricted
                           Subsidiary, as the case may be, in respect of or as a
                           repayment of such Investment, and (B) the amount of
                           Debt of such former Restricted Subsidiary received by
                           AK Steel or its Restricted Subsidiaries as part of
                           the consideration for the acquisition of the Equity
                           Interests or assets of such former Restricted
                           Subsidiary), if any, made in such former Restricted
                           Subsidiary after October 1, 1996."

                  (p) Section 5.1 of the Indenture shall be amended by (i)
         inserting the word "Guarantor" immediately before the word "Subsidiary"
         and (ii) deleting the parenthetical clause "(other than a Non-Recourse
         Subsidiary)", in each case, in the last paragraph thereof.

                  (q) Clause (a) of Section 10.4 of the Indenture shall be
         amended as follows:

                           (i) the word "Guarantor" shall be inserted
                  immediately before the first reference to the word
                  "Subsidiary" therein;

                           (ii) the parenthetical clause "(other than a
                  Non-Recourse Subsidiary)" shall be deleted; and

                           (iii) the words "become a Guarantor Subsidiary with
                  respect to the Securities by executing and delivering" shall
                  be deleted and replaced with the words "execute and deliver"
                  therein.

                                       5
<PAGE>

         Section 2.2 Notification to Holders. AK Steel shall notify the Holders
                     -----------------------
in accordance with Section 9.02 of the Indenture of the execution of this First
Supplemental Indenture. Any failure of AK Steel to give such notice to all
Holders, or any defect therein, shall not impair or affect the validity of this
First Supplemental Indenture.

         Section 2.3 Receipt by Trustee. In accordance with Sections 9.6 and
                     ------------------
11.4 of the Indenture, the parties acknowledge that the Trustee has received an
Officers' Certificate and an Opinion of Counsel as conclusive evidence that this
First Supplemental Indenture complies with the applicable requirements of the
Indenture, including that the Proposed Amendments are authorized or permitted by
the Indenture.

                                   ARTICLE III

                                  MISCELLANEOUS
                                  -------------

         Section 3.1 Parties. Nothing expressed or mentioned herein is intended
                     -------
or shall be construed to give any Person, other than the Holders and the
Trustee, any legal or equitable right, remedy or claim under or in respect of
this First Supplemental Indenture or the Indenture or any provision herein or
therein contained.

         Section 3.2 Governing Law. The rights and duties of AK Steel, Holding
                     -------------
and the Trustee under this First Supplemental Indenture shall, pursuant to New
York General Obligations Law Section 5-1401, be governed by the laws of the
State of New York.

         Section 3.3 Separability Clause. In case any provision in this First
                     -------------------
Supplemental Indenture shall be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any way be
affected or impaired thereby.

         Section 3.4 Ratification of Indenture; First Supplemental Indenture
                     -------------------------------------------------------
Part of Indenture. Except as expressly supplemented hereby, the Indenture is in
- -----------------
all respects ratified and confirmed and all the terms, conditions, and
provisions thereof shall remain in full force and effect. This First
Supplemental Indenture shall form a part of the Indenture for all purposes, and
every Holder of Notes heretofore or hereafter authenticated and delivered shall
be bound hereby. The Trustee makes no representation or warranty as to the
validity or sufficiency of this First Supplemental Indenture.

         Section 3.5 Multiple Originals. The parties may sign any number of
                     ------------------
copies of this First Supplemental Indenture. Each signed copy shall be an
original, but all of them shall represent the same agreement. One signed copy is
enough to prove this First Supplemental Indenture.

         Section 3.6 Headings. The headings of the Articles and Sections of this
                     --------
First Supplemental Indenture have been inserted for convenience of reference
only, are not intended to be considered a part hereof and shall not modify or
restrict any of the terms or provisions hereof.

                                       6
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this First
Supplemental Indenture to be duly executed as of the date first written above.




                                        AK STEEL CORPORATION


                                        By:
                                            ---------------------------------
                                            Name:
                                            Title:




                                        AK STEEL HOLDING CORPORATION,
                                        as Guarantor


                                        By:
                                            ---------------------------------
                                            Name:
                                            Title:




                                        FIFTH THIRD BANK,
                                        as Trustee


                                        By:
                                            ---------------------------------
                                            Name:
                                            Title:

                                       7

<PAGE>

                                                                   EXHIBIT 23.1

                         INDEPENDENT AUDITORS' CONSENT

  We consent to the incorporation by reference in this Amendment No. 3 to
Registration Statement No. 333-75451 of AK Steel Corporation and No. 333-
75451-01 of AK Steel Holding Corporation on Form S-4 of our report dated
January 20, 1999, appearing in the Annual Report on Form 10-K of AK Steel
Holding Corporation for the year ended December 31, 1998, and to the reference
to us under the heading "Experts" in the Prospectus, which is part of such
Registration Statement.

/s/ Deloitte & Touche LLP

Cincinnati, Ohio

August 2, 1999

<PAGE>

                                                                    Exhibit 23.3

                         INDEPENDENT AUDITORS' CONSENT

  We consent to the incorporation by reference in this Amendment No. 3 to
Registration Statement No. 333-75451 of AK Steel Corporation and Registration
Statement No. 333-75451-01 of AK Steel Holding Corporation on Form S-4 of our
report dated February 5, 1999 on the consolidated financial statements of Armco
Inc. and subsidiaries appearing in and incorporated by reference in the Annual
Report on Form 10-K of Armco Inc. for the year ended December 31, 1998.

  We also consent to the reference to us under the heading "Experts" in the
Prospectus, which is part of such Registration Statement.

/s/ Deloitte & Touche LLP

Pittsburgh, Pennsylvania

August 2, 1999


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