Steel wire rod for hard drawn spring, drawn wire rod for hard drawn spring and hard drawn spring, and method for producing hard drawn spring
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United States of America Patent
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Jul 11, 2006
Grant Date -
Feb 6, 2003
app pub date -
Dec 19, 2001
filing date -
Dec 20, 2000
priority date (Note) -
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Abstract
Disclosed is a steel wire rod for hard-drawn springs capable of exhibiting fatigue strength and sag resistance equivalent to or higher than springs made of an oil-tempered wire. The steel wire rod contains carbon in a range from 0.5 to less than 0.7 mass %, silicon in a range from 1.4 to 2.5 mass %, manganese in a range from 0.5 to 1.5 mass %, chromium in a range from 0.05 to 2.0 mass %, and vanadium in a range from 0.05 to 0.40 mass %, and has an area ratio Rp with respect to pearlite which satisfies the mathematical expression (1): Rp(area %).gtoreq.55.times.[C]+61 (1) where [C] denotes the content (mass %) of carbon.
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