<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM AK STEEL
HOLDING CORPORATION'S QUARTERLY REPORT AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000,000
<CURRENCY> U.S. DOLLAR
<S> <C>
<PERIOD-TYPE> 6-MOS
<PERIOD-START> JAN-01-2000
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<EXCHANGE-RATE> 1
<CASH> 142
<SECURITIES> 0
<RECEIVABLES> 592
<ALLOWANCES> 0
<INVENTORY> 776
<CURRENT-ASSETS> 1,585
<PP&E> 4,633
<DEPRECIATION> 1,702
<TOTAL-ASSETS> 5,260
<CURRENT-LIABILITIES> 883
<BONDS> 1,451
0
13
<COMMON> 1
<OTHER-SE> 1,297
<TOTAL-LIABILITY-AND-EQUITY> 5,260
<SALES> 2,366
<TOTAL-REVENUES> 2,366
<CGS> 1,919
<TOTAL-COSTS> 2,172
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 68
<INCOME-PRETAX> 127
<INCOME-TAX> 52
<INCOME-CONTINUING> 76
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 76
<EPS-BASIC> 0.68
<EPS-DILUTED> 0.68
</TABLE>