High tensile strength steel sheets having high press-formability

Details High tensile strength steel sheets having high press-formability High tensile strength steel sheets having high press-formability

1979-08-20

1981-09-29

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 124, 148 36, C21D 804, C21D 704

Patent

active

042920973

ABSTRACT:
High tensile strength steel sheets having high press formability and excellent shape-fixability in which an average roughness in surface Ha is 0.4-1.8 .mu.m, PPI value is more than 80 at a cut off level of 0.5 .mu.m, the proportional limit stress is less than 20 kg/mm.sup.2 and the microstructure consists of ferrite grains dispersed with fine martensite islands, are produced by cold rolling a hot rolled steel sheet containing 0.005-0.15% of carbon, and manganese, if necessary boron, molybdenum, chromium, silicon, nickel and copper within a range of 0.27-3% of Mneq. shown by the following formula (1)

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patent: 4067756 (1978-01-01), Koo et al.
patent: 4072543 (1978-02-01), Coldren et al.
patent: 4129461 (1978-12-01), Rashid
patent: 4159218 (1979-06-01), Chatfield et al.
patent: 4196025 (1980-04-01), Davies

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