Cold rolled, ductile, high strength steel strip and sheet and me

Details Cold rolled, ductile, high strength steel strip and sheet and me Cold rolled, ductile, high strength steel strip and sheet and me

1981-05-06

1983-07-12

Stallard, W.

Metal treatment

Compositions

Heat treating

C21D 702, C21D 714

Patent

active

RE0313068

ABSTRACT:
Cold reduced, annealed steel strip and sheet stock having 0.2% yield strength of 45 to 65 ksi with an elongation of at least 25%, or having a yield strength of at least 90 ksi with an elongation of at least 10%. A low carbon steel (0.02-0.10% C) typical of rimmed or drawing steel analysis is preferably vacuum degassed, and 0.02% to 0.18% columbium is added. The casting is hot rolled, coiled not higher than 1300.degree. F., cold reduced 40% to 70%, and annealed at low temperature for a time sufficient to restore desired ductility without substantially decreasing yield strength.

REFERENCES:
patent: 3264144 (1966-08-01), Frazier et al.
patent: 3772091 (1973-11-01), Mayer et al.
patent: 3814636 (1974-06-01), Mould et al.
patent: 3843417 (1974-10-01), Ohbu et al.
patent: 3843423 (1974-10-01), Asano et al.
patent: 3897280 (1975-07-01), Gondo et al.
patent: 3950190 (1976-04-01), Lake

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