High-strength steel sheet for forming and production thereof

Details High-strength steel sheet for forming and production thereof High-strength steel sheet for forming and production thereof

C - Chemistry, Metallurgy

22

C

C22C 38/14 (2006.01) C21D 9/48 (2006.01) C22C 38/58 (2006.01) C23C 2/06 (2006.01) C25D 5/26 (2006.01) C21D 8/04 (2006.01)

Patent

CA 2082807

-41- ABSTRACT This invention provides a high-strength steel sheet having a small plane anisotropy, a low yield ratio, a complete non-aging property and a high r-value and hardly causing the softening in high temperature heating which is obtained by heating a slab of steel having a composition by weight of C: 0.01-0.1%, Si: 0.1-1.2%, Mn: not more than 3.0%, Ti: value of (Ti%-1.5S%-3.43N%)/C% of 4-12, B: 0.0005-0.005%, Al: not more than 0.1%, P: not more than 0.1%, S: not more than 0.02% and N: not more than 0.05% at a temperature of 1100-1280°C and hot rolling and if necessary cold rolling - annealing.

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