Process of making a high strength cold reduced steel sheet havin

Details Process of making a high strength cold reduced steel sheet havin Process of making a high strength cold reduced steel sheet havin

1975-11-14

1977-09-27

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

148 12F, 148 124, C21D 946

Patent

active

040509591

ABSTRACT:
When a cold reduced steel of which chemical composition is substantially controlled within the range of 10x[S]% to 2.00% [Mn], 0.003 to 0.02% [N] and (<5.times.10.sup.31 4)/[N]% [Al] is subjected to a full continuous annealing process comprising a heating-up step of Ac.sub.1 to 900.degree. C .times. 5 to 180 sec., a rapid cooling step of the heating-up temperature to about room temperature by water-spray, reheating step of the room temperature to 150.degree. C to 450.degree. C .times. 5 to 300 sec., and then final cooling- and coiling step, high bake-hardenability and excellent non-aging property are given to the above steel with ease.

REFERENCES:
patent: 3806376 (1974-04-01), Toda et al.
patent: 3839095 (1974-10-01), Kubotera et al.
patent: 3853639 (1974-12-01), Hughes
patent: 3865645 (1975-02-01), Takahashi et al.
patent: 3904446 (1975-09-01), Uchida et al.
patent: 3920487 (1975-11-01), Gondo et al.
patent: 3947293 (1976-03-01), Takechi et al.

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