| 摘要 |
(A) A continuously annealed steel sheet, having excellent stretching flange formability and suitable for prodn. of drawn and ironed cans, has the compsn. 0.004-0.060% C, 0.05-0.60% Mn, max. 0.020% P, 0.05-0.100% acid-soluble Al, max. 0.007% N, balance Fe and impurities and has a tensile strength of max. 42 kgf/sq.mm. and a JIS grain size number of 8.5-11.5. - (B) Prodn. of the steel sheet involves hot rolling a low carbon Al-killed steel slab of compsn. given in (A), coiling the resulting strip at 600-710 deg. C, cold rolling, recrystallisation annealing at max. 850 deg. C for 5 secs. to 3 mins., cooling at 5-250 deg. C/sec. and overaging at 300-500 deg. C for 30-180 secs.
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