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

1985-09-16

1986-12-09

Stallard, Wayland

Metal treatment

Compositions

Heat treating

148 12D, 420128, C21D 702, C21D 713, C21D 714

Patent

active

046278818

ABSTRACT:
A cold rolled steel sheet having excellent stretchability, deep drawability, and secondary workability, and a method for producing the same, which comprises the steps of hot rolling an Al-killed steel containing not more than 0.0025%N by weight, not more than 0.010%P by weight, and not more than 0.07% C by weight, and wherein P and N have the relation of P+5N.ltoreq.0.02% 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.

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