High strength spring steel having excellent hydrogen embrittlement resistance
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United States of America Patent
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Oct 21, 2008
Grant Date -
Aug 3, 2006
app pub date -
Jan 27, 2006
filing date -
Jan 28, 2005
priority date (Note) -
Expired
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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; and 10% 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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