CASE-HARDENING STEEL AND CASE-HARDENED STEEL MEMBER
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United States of America Patent
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Issued Date -
Mar 3, 2016
app pub date -
Apr 16, 2014
filing date -
Apr 18, 2013
priority date (Note) -
Abandoned
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Abstract
There is provided a case-hardening steel in which in inclusion evaluation using an extreme value statistical method, when an estimated area S is 30,000 mm2, an estimated value of the maximum size (√area)S of sulfide-based inclusions present in the estimated area S is 49 μm or less and an estimated value of the maximum size (√area)Ox of oxide-based inclusions present in the estimated area S is 80 μm or less, and the number of sulfide-based inclusions having a length of more than 20 μm and a thickness of more than 2 μm per 1 mm2 is limited to 200 or less,
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