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Title:
NITRIDED STEEL MEMBER, AND METHOD AND DEVICE FOR PRODUCING NITRIDED STEEL MEMBER
Document Type and Number:
WIPO Patent Application WO/2019/208534
Kind Code:
A1
Abstract:
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.

Inventors:
HIRAOKA Yasushi (2-16-8, Nihonbashi, Chuo-k, Tokyo 27, 〒1030027, JP)
WATANABE Youichi (2-16-8, Nihonbashi, Chuo-k, Tokyo 27, 〒1030027, JP)
Application Number:
JP2019/017127
Publication Date:
October 31, 2019
Filing Date:
April 23, 2019
Export Citation:
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Assignee:
PARKER NETSUSHORI KOGYO CO., LTD. (2-16-8, Nihonbashi Chuo-k, Tokyo 27, 〒1030027, JP)
International Classes:
C23C8/26; C21D1/06; C21D1/76; C22C38/00; F27B5/04; F27B5/16; F27B5/18; C21D9/30; C21D9/32
Foreign References:
JP2016194111A2016-11-17
Other References:
30 August 2011, article DIETER LIEDTKE ET AL: "Passages, NITRIDING AND NITROCARBURIZING ON IRON MATERIALS", pages: 37-39 131-133 - 136-137, XP008185009
Attorney, Agent or Firm:
TANAKA Shinichiro et al. (NAKAMURA & PARTNERS, Shin-Tokyo Bldg. 3-1, Marunouchi 3-chome, Chiyoda-k, Tokyo 55, 〒1008355, JP)
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