| 摘要 |
PURPOSE:To enable production of a thin plate material of an extra low-carbon aluminum killed steel having excellent deep drawability in the stage of producing the aluminum killed steel plate by subjecting the plate to warm rolling in place of cold rolling then to a continuous annealing treatment. CONSTITUTION:A slab of an extra low-carbon aluminum killed steel contg. <0.0040% C, 0.010-0.080% Al, <1.0% Mn, <2.0% Si, <0.15% P, and <=0.040% in total of at least one kind among Ti, Nb, B and W is hot rolled to manufacture a rolled blank material for a steel plate. Said material is warm-rolled at a total draft of at least 30% in a temp. range of 600-300 deg.C without cold rolling. The rolled material is pickled and is then heated quickly at a heating rate of >=1,000 deg.C/min from a room temp. to 700 deg.C and is subjected to a continuous anealing treatment in a temp. range of 750 deg.C- Ar3 point in a continuous annealing line. The thin steel plate having excellent deep drawability is obtd. |
