Cold rolled, ductile, high strength steel strip and method...

Details Cold rolled, ductile, high strength steel strip and method... Cold rolled, ductile, high strength steel strip and method...

C - Chemistry, Metallurgy

21

D

13/12, 75/147, 1

C21D 7/02 (2006.01) C21D 8/02 (2006.01) C22C 38/12 (2006.01)

Patent

CA 1072865

ABSTRACT OF THE DISCLOSURE 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 prefer- ably vacuum degassed, and 0.02% to 0.18% columbium is added. The casting is hot rolled, coiled not higher than 1300°F. cold reduced 40% to 70%, and annealed at low temperature for a time sufficient to restore desired ductility without substantially decreasing yield strength.

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