High strength hot rolled steel sheet having excellent...

Details High strength hot rolled steel sheet having excellent... High strength hot rolled steel sheet having excellent...

2007-04-12

2010-12-07

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S334000, C148S602000, C148S654000

Reexamination Certificate

active

07846275

ABSTRACT:
Disclosed is a hot rolled steel sheet in which it includes a steel having a chemical composition of 0.03 to 0.10% (the percent hereinafter representing % by mass) of C, 0.2 to 2.0% of Si, 0.5 to 2.5% of Mn, 0.02 to 0.10% of Al, 0.2 to 1.5% of Cr, 0.1 to 0.5% of Mo, and the residue of iron and inevitable contaminants, and in this steel sheet, at least 80% by area in longitudinal cross section has a martensitic structure. As a consequence, a high strength hot rolled steel sheet having a tensile strength of the level as high as 980 MPa or higher simultaneously with an excellent forming workability, and in particular, excellent stretch flangeability is provided at a relatively low cost.

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Machine-English translation of Korean patent 2003-0054377, Jul. 2, 2003, Hae-Chag Choi.
Machine English translation of Japanese patent 2004-315882, Shigeto Takebayashi et al., Nov. 11, 2004.

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