<ARTICLE>                     5
<LEGEND>                      This   schedule    contains   summary    financial
                              information  extracted from  Consolidated  Summary
                              Financial  Statements  and Notes  included in this
                              Form  10-Q and is  qualified  in its  entirety  by
                              reference to such financial statements.
</LEGEND>
<MULTIPLIER>                  1,000
<PERIOD-END>                  MAR-31-1997
<PERIOD-TYPE>                 3-MOS
<FISCAL-YEAR-END>             DEC-31-1997
       
                           
<CASH>                                           7,100
<SECURITIES>                                         0
<RECEIVABLES>                                  121,800
<ALLOWANCES>                                    (1,700)
<INVENTORY>                                    269,100
<CURRENT-ASSETS>                               705,100
<PP&E>                                       2,534,000
<DEPRECIATION>                              (1,244,100)
<TOTAL-ASSETS>                               2,752,400
<CURRENT-LIABILITIES>                          345,500
<BONDS>                                        581,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       117,000
<OTHER-SE>                                   1,353,600
<TOTAL-LIABILITY-AND-EQUITY>                 2,752,400
<SALES>                                        554,600
<TOTAL-REVENUES>                               554,600
<CGS>                                          510,100
<TOTAL-COSTS>                                  467,500
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               8,800
<INCOME-PRETAX>                                 78,300
<INCOME-TAX>                                    37,600
<INCOME-CONTINUING>                             42,000
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    42,000
<EPS-PRIMARY>                                         .39
<EPS-DILUTED>                                        0