Title:
NITRIDED STEEL MEMBER, AND METHOD AND APPARATUS FOR PRODUCING NITRIDED STEEL MEMBER
Document Type and Number:
WIPO Patent Application WO/2020/090999
Kind Code:
A1
Abstract:
A nitrided steel member which has a matrix that is formed of a carbon steel or a low alloy steel, and which is characterized by having a hardened layer in the surface, said hardened layer having an austenite structure that contains 1.0% by mass or more of nitrogen, and by having a diffusion layer below the hardened layer, said diffusion layer being obtained by diffusing nitrogen into the matrix. This nitrided steel member is also characterized in that: the hardened layer has a thickness of 2-50 µm from the surface of the nitrided steel member; the diffusion layer extends to a depth of more than 100 µm from the surface of the nitrided steel member; and the hardness of the diffusion layer at a depth of 100 µm from the surface of the nitrided steel member is higher than the hardness at a depth of 2 mm from the surface of the nitrided steel member by 100 HV or more.
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Inventors:
HIRAOKA YASUSHI (JP)
Application Number:
PCT/JP2019/042887
Publication Date:
May 07, 2020
Filing Date:
October 31, 2019
Export Citation:
Assignee:
PARKER NETSUSHORI KOGYO CO LTD (JP)
International Classes:
C23C8/26; C21D1/06; C21D1/76; C21D9/30; C21D9/32
Domestic Patent References:
| WO2018066667A1 | 2018-04-12 |
Foreign References:
| JP2013053342A | 2013-03-21 | |||
| JP2017036509A | 2017-02-16 | |||
| JP2011026627A | 2011-02-10 | |||
| JP2019014956A | 2019-01-31 |
Attorney, Agent or Firm:
TANAKA Shinichiro et al. (JP)
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