HIGH-STRENGTH SPRING
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United States of America Patent
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Issued Date -
May 23, 2013
app pub date -
Jun 21, 2011
filing date -
Aug 3, 2010
priority date (Note) -
Abandoned
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Abstract
The present specification provides a spring of greater strength. A spring 2 disclosed in the present specification comprises a steel material layer 12 and a compound layer 14 containing nitride and formed on a surface of the steel material layer 12. The steel material layer 12 contains, in mass percent, C: 0.55 to 0.75, Si: 1.50 to 2.50, Mn: 0.30 to 1.00, Cr: 0.80 to 2.00, W: 0.05 to 0.30, and iron and inevitable impurities as remainders. Carbide precipitated in the steel. material layer has an average length of 0.12 μm or less and an average width of 0.04 μm or less.
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