Metal treatment – Stock – Ferrous
Reexamination Certificate
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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Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd).
Kiechle Caitlin
King Roy
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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