High strength steel plate and method for manufacturing same

Details High strength steel plate and method for manufacturing same High strength steel plate and method for manufacturing same

1981-10-15

1985-02-26

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 12F, C21D 948, C21D 804

Patent

active

045016267

ABSTRACT:
There are described a high strength steel plate having a low yield ratio and improved strength-elongation balance and stretch flangeability, and a method for producing same, the steel plate containing 0.01-0.2% of C, 0.3-2.5% of Mn and 0.01-1.8% of Si and having a tripple phase of polygonal ferrite, bainite and martensite, the area ratios of the bainite and martensite phases being 4-45% and 1-15%, respectively, and the area ratio of the bainite phase being greater than that of the martensite phase.

REFERENCES:
patent: 4072543 (1978-02-01), Coldren et al.
patent: 4314862 (1982-02-01), Sudo et al.
patent: 4316753 (1982-02-01), Kaneko et al.
patent: 4388122 (1983-06-01), Sudo et al.

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