Process for producing a hot rolled steel sheet with high strengt

Details Process for producing a hot rolled steel sheet with high strengt Process for producing a hot rolled steel sheet with high strengt

1990-08-23

1991-07-09

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12C, C21D 802

Patent

active

050302981

ABSTRACT:
A hot rolled steel sheet with a high strength and a distinguished formability, and a process for producing the same are disclosed. The steel sheet comprises 0.15 to 0.4% by weight of C, 0.5 to 2.0% by weight of Si, and 0.5 to 2.0% by weight of Mn, the balance being iron and inevitable impurities, and has a microstructure composed of ferrite, bainite and retained austenite phases with the ferrite phase being a ratio (V.sub.PF /d.sub.PF) of polygonal ferrite volume fraction V.sub.PF (%) to polygonal ferrite average grain size d.sub.PF (.mu.m) of 7 or more and the retained austenite phase being contained in an amount of 5% by volume or more on the basis of the total phases. The steel sheet can be produced with a high productivity and without requiring special alloy elements.

REFERENCES:
patent: 4184898 (1980-01-01), Ouchi et al.
patent: 4285741 (1981-08-01), Furukawa et al.
patent: 4397698 (1983-08-01), Davenport et al.
patent: 4501626 (1985-02-01), Sudo et al.

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