Title:
NITRIDED STEEL MEMBER, AND METHOD AND APPARATUS FOR PRODUCING NITRIDED STEEL MEMBER
Document Type and Number:
WIPO Patent Application WO/2019/131602
Kind Code:
A1
Abstract:
This nitrided steel member contains a carbon steel or a low alloy steel as a matrix phase, and is characterized by having a hardened layer having a martensite structure containing 0.8% or more of nitrogen at the surface of the member, having a diffusion layer, in which nitrogen diffuses into the matrix phase, below the hardened layer, and 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 at least 100 HV more than the hardness at a depth of 2 mm from the surface of the nitrided steel member.
Inventors:
WATANABE YOUICHI (JP)
HIRAOKA YASUSHI (JP)
HIRAOKA YASUSHI (JP)
Application Number:
PCT/JP2018/047505
Publication Date:
July 04, 2019
Filing Date:
December 25, 2018
Export Citation:
Assignee:
PARKER NETSUSHORI KOGYO CO LTD (JP)
International Classes:
C23C8/26; C21D1/06; C21D1/76; F27B5/04; F27B5/16; F27B5/18
Foreign References:
| JP2014047410A | 2014-03-17 | |||
| JP2013221203A | 2013-10-28 | |||
| JP2010007128A | 2010-01-14 | |||
| JP2007046088A | 2007-02-22 | |||
| JP2011219851A | 2011-11-04 | |||
| JP2017171951A | 2017-09-28 |
Attorney, Agent or Firm:
TANAKA Shinichiro et al. (JP)
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