High strength hot rolled steel sheet with excellent press...

Details High strength hot rolled steel sheet with excellent press... High strength hot rolled steel sheet with excellent press...

2008-02-26

2011-11-08

King, Roy (Department: 1733)

Metal treatment

Stock

Ferrous

C148S330000, C148S601000, C148S602000, C420S120000

Reexamination Certificate

active

08052808

ABSTRACT:
Disclosed is a hot rolled steel sheet which contains C, Si, Mn, Al, Ti, N, and S. The C, Ti, N, and sulfur contents satisfy the following condition (1), and the Si and Mn contents satisfy the following condition (2):in-line-formulae description="In-line Formulae" end="lead"?[C]−{[Ti]−(48/14)×[N]−(48/32)×[S]}/4≦0.01  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.20≦([Si]/[Mn])≦0.85  (2)in-line-formulae description="In-line Formulae" end="tail"?in which the symbol [X] represents the content (percent by mass) of the element X, and the steel sheet has a microstructure having an area percentage of bainitic ferrite of 90% or more, an area percentage of martensite of 5% or less, and an area percentage of bainite of 5% or less, based on the area of an observed field. This steel sheet excels in properties demanded in press working, such as shape freezing ability, hole-expandability, and bendability, even though it has a high tensile strength of 980 MPa or more.

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