Cold rolled steel sheet having excellent press formability and m

Details Cold rolled steel sheet having excellent press formability and m Cold rolled steel sheet having excellent press formability and m

1986-08-07

1987-07-07

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 12D, 420121, 420128, C21D 702, C21D 713

Patent

active

046785221

ABSTRACT:
A cold rolled boron steel sheet having excellent stretchability, deep drawability, and second workability and method for producing the same, which comprises the steps of hot rolling a steel containing not more than 0.05% C by weight and, P and N in the relation of P+5N.ltoreq.0.0175% by weight at a temperature of 850.degree. C. or more, cold rolling the hot rolled steel strip at a reduction of not less than 50%, and subjecting the cold rolled steel strip to continuous annealing at a temperature between the recrystallization temperature and the A.sub.3 point.

REFERENCES:
patent: 3959029 (1976-05-01), Matsudo et al.
patent: 4040873 (1977-08-01), Nakaoka et al.
patent: 4313772 (1982-02-01), Paulus
patent: 4315783 (1982-02-01), Akisue et al.
patent: 4368084 (1983-01-01), Irie et al.
patent: 4410372 (1983-10-01), Takahashi et al.
patent: 4627881 (1986-12-01), Kawano et al.

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