Steel component, gear component, and producing method for steel component

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United States of America Patent

PATENT NO 10889870
APP PUB NO 20190078171A1
SERIAL NO

16076658

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Abstract

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In this steel component, the concentration of C in a surface layer is 0.85 mass % or more to 1.2 mass % or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remainder of the surface layer is a martensitic structure, the area fraction of grain boundary carbides in the surface layer is lower than 2%, a layer inside the surface layer is higher than the surface layer in a volume ratio of a retained-austenite structure, and in the layer inside the surface layer, the remainder is a martensitic structure.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Koyama, Tatsuya Muroran, JP 127 859
Kubota, Manabu Nishinomiya, JP 82 247
Matsuzaka, Keisuke Okazaki, JP 9 4
Miyanishi, Kei Kitakyushu, JP 35 71
Obayashi, Koji Toyoake, JP 13 127
Okada, Kazuaki Anjo, JP 13 71
Sakakibara, Masashi Handa, JP 3 10

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