| 摘要 |
PURPOSE:To obtain the titled low carbon steel sheet without passing through a cold rolling-recrystallization annealing stage by warm rolling an Al killed ingot or steel billet having a specified composition after making the ferrite grains fine, and carrying out recrystallization treatment. CONSTITUTION:An Al killed ingot or steel billet contg. <=0.08% C, <=0.40% Mn and >=0.02% sol. Al is treated to precipitate AlN, and the ferrite grain size is regulated to No.10 or above. The billet is rolled at >=70% draft at 400-700 deg.C and subjected to recrystallization treatment. After finishing the treatment, pickling and rolling at about 1-10% draft may be carried out. |
