<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
company's consolidated Balance Sheet and Profit & Loss financial statements and
is qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                           9,906
<SECURITIES>                                         0
<RECEIVABLES>                                  371,265
<ALLOWANCES>                                     7,581
<INVENTORY>                                    425,597
<CURRENT-ASSETS>                               854,494
<PP&E>                                       2,544,059
<DEPRECIATION>                               1,423,980
<TOTAL-ASSETS>                               2,178,645
<CURRENT-LIABILITIES>                          567,245
<BONDS>                                        142,688
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       321,835
<OTHER-SE>                                     663,365
<TOTAL-LIABILITY-AND-EQUITY>                 2,178,645
<SALES>                                      1,316,587
<TOTAL-REVENUES>                             1,316,587
<CGS>                                          995,856
<TOTAL-COSTS>                                  995,856
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              11,053
<INCOME-PRETAX>                                140,993
<INCOME-TAX>                                    54,987
<INCOME-CONTINUING>                             86,006
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    86,006
<EPS-PRIMARY>                                     1.37
<EPS-DILUTED>                                     1.35