<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                           63322
<SECURITIES>                                         0
<RECEIVABLES>                                    87663
<ALLOWANCES>                                         0
<INVENTORY>                                     115989
<CURRENT-ASSETS>                                304637
<PP&E>                                          503320
<DEPRECIATION>                                  260063
<TOTAL-ASSETS>                                  702403
<CURRENT-LIABILITIES>                           123340
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           283
<OTHER-SE>                                      419875
<TOTAL-LIABILITY-AND-EQUITY>                    702403
<SALES>                                         546693
<TOTAL-REVENUES>                                546693
<CGS>                                           412801
<TOTAL-COSTS>                                   412801
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                2379
<INCOME-PRETAX>                                  30788
<INCOME-TAX>                                     12600
<INCOME-CONTINUING>                              18188
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     18188
<EPS-PRIMARY>                                     0.63
<EPS-DILUTED>                                     0.63