Method of producing high strength cold rolled steel sheet

Details Method of producing high strength cold rolled steel sheet Method of producing high strength cold rolled steel sheet

1976-12-27

1978-05-30

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12F, 148 36, C21D 710, C21D 714, C21D 946

Patent

active

040921794

ABSTRACT:
A high-strength, cold rolled steel sheet product characterized by a rimmed surface and an aluminum killed, columbium-containing core is produced by hot rolling at a finishing temperature above its Ar.sub.3 temperature and coiling at a temperature between 1000.degree. F. and 1200.degree. F., cold rolling between 50% and 90% reduction, batch annealing to recrystallize the coil, and temper rolling between 0.75% and 2.0% temper elongation. The product is non-aging, has a 50,000 p.s.i. minimum yield strength in the temper rolled condition, good formability, and a surface quality equivalent to that of Drawing Quality Rimmed Steel.

REFERENCES:
patent: 2387919 (1945-10-01), Lose
patent: 3556866 (1971-01-01), Gibbs et al.
patent: 3615278 (1971-10-01), Yamamoto et al.
patent: 3666570 (1972-05-01), Korchynsky et al.
patent: 3668016 (1972-06-01), Shimizu et al.
patent: 3754591 (1973-08-01), Bales et al.
patent: 3926686 (1975-12-01), Creswick et al.
patent: 3928083 (1975-12-01), Gondo et al.
patent: 3947293 (1976-03-01), Takechi et al.
patent: 3976514 (1976-08-01), Matsukura et al.

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