| 摘要 |
PURPOSE:To manufacture a cold rolled steel sheet for deep drawing causing no secondary working crack by carrying out heating and cooling under specified conditions when a cold rolled dead soft steel sheet is continuously annealed. CONSTITUTION:A dead soft steel sheet is cold rolled and heated to a temp. above the recrystallization temp. to carry out continuous annealing. At this time, the cold rolled steel sheet is heated at >=1 deg.C/sec heating rate, and cooling is started within 5sec after finishing the heating. Thus, the fear that P is segregated is reduced, and secondary working crack is prevented. |
