Hot rolled steel sheet with high strength and distinguished form

Details Hot rolled steel sheet with high strength and distinguished form Hot rolled steel sheet with high strength and distinguished form

1989-11-27

1991-05-21

Yee, Deborah

Metal treatment

Stock

Ferrous

420 84, C22C 3804, C22C 3802

Patent

active

050172484

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 in 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 productiviity and without requiring special alloy elements.

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