COLD ROLLED SHEET OF LOW CARBON ALUMINUM KILLED STEEL FOR DEEP DRAWING AND ITS PRODUCTION

摘要

PURPOSE: To produce a cold rolled sheet of Al killed steel, excellent in deep drawability. ;CONSTITUTION: (1) A cold rolled sheet of aluminum killed steel excellent in deep drawability, which has a composition containing 0.010-0.100% C, 0-10.% Si, 0.05-2.0% Mn, ≤0.1% P, 0.0050% S, 0.0005-0.0050% N, 0.005-0.15 sol.Al, and 0-0.0050% B is produced. (2) A slab of a steel as material, having a composition containing 0.010-0.100% C, 0-1.0% Si, 0.05-2.0% Mn, ≤0.1% P, 0.0040% S, 0 0005-0.0050% N, and 0.005-0.1% sol.Al, is used. Hot rolling is finished at ≥850°C, and the resultant steel plate is coiled at 600°C, descaled, cold-rolled at 60-95% draft, and box-annealed at a temp. between the recrystallization temp. and the A_c3 point. By this method, the cold rolled sheet of aluminum killed steel, excellent in deep drawability, can be produced. Furthermore in this method, cooling can be done at 600-700°C after hot rolling and annealing can be done by continuous annealing.;COPYRIGHT: (C)1995,JPO