Method for producing a high-strength cold rolled steel sheet hav

Details Method for producing a high-strength cold rolled steel sheet hav Method for producing a high-strength cold rolled steel sheet hav

1974-08-08

1976-04-20

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12C, 148 12F, C21D 702, C21D 946

Patent

active

039516962

ABSTRACT:
A method for producing a cold rolled steel sheet having high strength and stretchability which comprises hot rolling a steel containing 0.03 to 0.30% C, less than 0.7% Si, 0.6 to 2.5% Mn, 0.01 to 0.20% sol.Al, not more than 0.015% O with the balance being Fe and unavoidable impurities, cold rolling with a reduction not less than 30%, heating with an average heating rate not less than 3.degree.C/sec. annealing in a temperature range from 650.degree.C to A.sub.3 transformation point for 1 to 15 minutes, and cooling with an average cooling rate of 0.5.degree. to 30.degree.C/sec. down to 500.degree.C.

REFERENCES:
patent: 3178318 (1965-04-01), Shimizu et al.
patent: 3357822 (1967-12-01), Miyoshi et al.
patent: 3830669 (1974-08-01), Matsuoka
patent: 3857740 (1974-12-01), Gondo et al.

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