Metal treatment – Stock – Ferrous
Reexamination Certificate
2006-01-27
2008-10-21
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S330000, C148S333000, C148S334000, C148S335000, C148S336000, C148S908000
Reexamination Certificate
active
07438770
ABSTRACT:
The present invention provides a high strength steel used for spring steel that has excellent hydrogen embrittlement resistance.The high strength steel which spring steel having excellent hydrogen embrittlement resistance comprises 0.20 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, higher than 0% and not higher than 1.5% of Al, 0.15% or less P, 0.02% or less S, and balance of iron and inevitable impurities and the structure includes:1% or more residual austenite;80% or more in total of bainitic ferrite and martensite; and10% or less (may be 0%) in total content of ferrite and pearlite in the proportion of area to the entire structure, and also the mean axis ratio (major axis/minor axis) of the residual austenite grains is 5 or higher and the steel tensile strength is 1860 MPa or higher.
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Ikeda Shushi
Saito Kenji
Sugimoto Koichi
Yuse Fumio
(Kobe Steel, Ltd.)
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Shinshu TLO Co., Ltd.
Yee Deborah
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