CASE-HARDENING STEEL AND CASE-HARDENED STEEL MEMBER

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United States of America Patent

APP PUB NO 20160060744A1
SERIAL NO

14783292

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Abstract

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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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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL & SUMITOMO METAL CORPORATIONTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
KOZAWA, Shuji Hokkaido, JP 21 69
KUBOTA, Manabu Amagasaki-shi, JP 67 131

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