Hollow seamless pipe for high-strength spring
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United States of America Patent
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Aug 30, 2016
Grant Date -
Oct 8, 2015
app pub date -
Apr 2, 2013
filing date -
Apr 2, 2012
priority date (Note) -
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Abstract
A hollow seamless pipe for a high-strength spring in the present invention includes a steel material in which chemical component compositions are properly adjusted, wherein a depth of a whole decarburized layer in an inner surface layer part is 100 μm or less, a depth of a flaw which is present in an inner surface is 40 μm or less, a width of the flaw is 60 μm or less, and a number density of a carbide which has a circle equivalent diameter of 500 nm or more and is present in the inner surface layer part is 1.8×10−2 particles/μm2 or less.
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