High strength dual-phase steel

Details High strength dual-phase steel High strength dual-phase steel

1979-02-05

1980-09-16

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 124, 148144, C21D 714

Patent

active

042227968

ABSTRACT:
A method of making, and the resulting product, of a dual-phase steel having increased tensile strength and a favorable ductility level is disclosed. The method comprises adding 0.1-0.2 Mo to 0.3-0.5 Cr and/or 0.7-0.2 V, to constitute a combined additive to a manganese-carbon-base steel. Upon heating to the insensitive portion of the intercritical annealing range (740.degree.-830.degree. C.) for 8 minutes and cooling at a rate less than 100.degree. C./sec., a dual-phase steel is produced having about 30% volume fraction martensite and a tensile strength level of about 150 ksi with a 12% elongation value.

REFERENCES:
patent: 4033789 (1977-07-01), Hamburg et al.
patent: 4062700 (1977-12-01), Hayami et al.
patent: 4067756 (1978-01-01), Koo et al.
patent: 4072543 (1978-02-01), Coldren et al.
patent: 4159218 (1979-06-01), Chatfield et al.

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