Process for producing deep-drawing, non-ageing, cold rolled stee

Details Process for producing deep-drawing, non-ageing, cold rolled stee Process for producing deep-drawing, non-ageing, cold rolled stee

1982-06-07

1983-10-18

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 12D, 148 124, 148144, C21D 804

Patent

active

044103727

ABSTRACT:
Al-killed steels containing 0.001-0.01% C., not larger than 1.5% Mn, 0.005-0.20% Al, not larger than 0.007% N and B in amounts determined by the ratio of B/N ranging from 0.5 to 2.5, and optionally containing not less than 1% Si and 0.04 to 0.12% P are subjected to ordinary hot and cold rolling operations, then soaked in a temperature range of from 730.degree. C. to A.sub.3 point by a continuous annealing process, and rapidly cooled from a temperature between the soaking temperature to 450.degree. C. down to a temperature not higher than 250.degree. C. at an average cooling rate not less than 60.degree. C./second, without subsequent overageing treatments, to obtain deep-drawing, non-ageing cold rolled steel sheets and strips having excellent press formability and paint bake-hardenability.

REFERENCES:
patent: 3725143 (1973-04-01), Alworth et al.
patent: 3950191 (1976-04-01), Ito et al.
patent: 3988173 (1976-10-01), Kawano
patent: 4315783 (1982-02-01), Akisue et al.
patent: 4331488 (1982-05-01), Sudo et al.

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