METHOD FOR MANUFACTURING STEEL PLATE FOR CAN-MAKING

摘要

In a method for manufacturing a steel plate for cans, when steal, the component composition of which is comprised of, in terms of mass%, C: 0.005% or less, Mn: 0.05-0.5%; Al: 0.01-0.10%, N: 0.0010-0.0070%, B: 0.15 × N-0.75 × N (0.15-0.75 in terms of B/N), one kind or two kinds selected from Nb: 4 × C-20 × C (4-20 in terms of Nb/C) and Ti: 2 × C-10 × C (2-10 in terms of Ti/C), and Fe and inevitable impure elements for the rest, is turned into a slab by means of continuous casting and applied with finishing rolling after rough rolling, the steel undergoes hot rolling which is 5% or greater and less than 50% of the total reduction amount in the finishing rolling at a temperature lower than the Ar3 transformation point, is next winded at a winding temperature of 640-750°C, is applied with cold rolling at a reduction rate of 88-96% after pickling, and is annealed in the temperature range from greater than 400°C to (recrystallization temperature -20)°C. With this manufacturing method, variations of plate thickness in the length direction of a steel plate coil can be controlled, and a high-strength steel plate for cans with ductility required for can-making can be obtained.