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摘要

PROBLEM TO BE SOLVED: To improve both deformation resistance and can formability of a container manufactured using an extra thin steel sheet for a container, without sacrificing either of the two.;SOLUTION: Steel having a composition consisting of, by mass, ≤0.0800% C, ≤0.600% N, ≤2.0% Si, ≤2.0% Mn, ≤0.10% P, ≤0.05% S, ≤2.0% Al and the balance mainly Fe is cold rolled. Then, atmosphere, temperature, time, etc., in recrystallization annealing or subsequent heat treatment are regulated and also proper surface treatment is carried out prior to the heat treatment, by which changes in N content in the steel, particularly the size and number density of nitrides with respect to a surface layer part and a central layer part, are controlled to values within proper different ranges, respectively. By this method, both the deformation resistance and can formability of the container manufactured using the extra thin steel sheet of ≤0.400 mm sheet thickness can be improved without sacrificing either of them.;COPYRIGHT: (C)2005,JPO&NCIPI