Method of manufacturing cold-rolled steel sheets

Details Method of manufacturing cold-rolled steel sheets Method of manufacturing cold-rolled steel sheets

1987-11-27

1989-04-04

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12C, 148 12F, C22C 804

Patent

active

048182990

ABSTRACT:
A cold-rolled steel sheet for deep drawing having an improved bake hardenability is disclosed, which comprises 0.005-0.015 wt% of C, not more than 1.0 wt% of Si, not more than 1.0 wt% of Mn, not more than 0.15 wt% of P, 0.0005-0.10 wt% of Al, not more than 0.003 wt% of S and not more than 0.004 wt% of N provided that S+N is not more than 0.005 wt%, and Ti satisfying 1.ltoreq.Ti*/C.ltoreq.20, in which Ti* (%)=Ti(%)-48/14N(%)-48/32S(%). Such a cold-rolled steel sheet is obtained by continuously annealing the steel sheet after the cold rolling, provided that a residence time over a temperature region above recrystallization temperature is within 300 seconds.

REFERENCES:
patent: 4504326 (1985-03-01), Tokunaga et al.
patent: 4517031 (1985-05-01), Takasaki et al.

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