NITRIDED STEEL MEMBER, AND METHOD AND DEVICE FOR PRODUCING NITRIDED STEEL MEMBER

WIPO Patent Application WO/2019/208534

A1

The present invention is a nitrided steel member in which a carbon steel having a carbon content of 0.10% by mass or more or a low alloy steel makes up a parent phase and an iron nitride compound layer is formed on the surface of the parent phase, the nitrided steel member being characterized in that the thickness of the iron nitride compound layer is 13 μm or more, the Vaγ'/(Vaε+Vaγ') value is 0.5 or more wherein Vaγ' and Vaε respectively represent the volume ratio of a γ' phase and the volume ratio of an ε phase in the entire region of the iron nitride compound layer, and the Vbγ'/(Vbε+Vbγ') value is 0.2 or more wherein Vbγ' and Vbε respectively represent the volume ratio of the γ' phase and the volume ratio of the ε phase in a lowermost region of the iron nitride compound layer when the iron nitride compound layer is divided into four regions in the depth direction.

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HIRAOKA YASUSHI (JP)
WATANABE YOUICHI (JP)

PCT/JP2019/017127

October 31, 2019

April 23, 2019

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PARKER NETSUSHORI KOGYO CO LTD (JP)

C21D1/06; C23C8/26; C21D1/76; C22C38/00; F27B5/04; F27B5/16; F27B5/18; C21D9/30; C21D9/32

JP2016194111A

2016-11-17

30 August 2011, article DIETER LIEDTKE ET AL: "Passages, NITRIDING AND NITROCARBURIZING ON IRON MATERIALS", pages: 37-39 131-133 - 136-137, XP008185009

TANAKA Shinichiro et al. (JP)

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