| 摘要 |
PURPOSE:To manufacture soft surface treating sheet efficient in workability, by continuously annealing the cold steel sheet of low carbon aluminum killed steel having fixed amounts of N and P at a specific temperature. CONSTITUTION:The slab of low carbon aluminum killed steel having the composition of under 0.05% S under 0.40% Mn, 0.010-0.08% Al, under 0.0020% N, under 0.010% P, under 0.0040% O and not more than 0.018% P+5N is hot-rolled to sheet material. Then, it is cold-rolled by a draft of 80% min and further treated with recrystallization annealing for a short time of 5 sec to 3min at a temperature of recrystallization temperature -850 deg.C by continuous annealing method. The soft surface treating steel sheet having efficient workability, especially to T-1 in temper degree, can be obtained. |
