Title:
METHOD FOR NITRIDING STEEL MEMBER
Document Type and Number:
WIPO Patent Application WO/2016/159235
Kind Code:
A1
Abstract:
This method for nitriding a steel member comprises the step of nitriding a steel member in a nitriding gas atmosphere having a nitriding potential at which a ɣ'-phase or ɛ-phase iron nitride compound layer can be formed on the surface of the steel member, and the passing step of subsequently passing the steel member through an atmosphere of 425ºC to 600ºC in which the iron nitride compound layer does not grow over five minutes or more. The iron nitride compound layer has a ɣ'-phase outermost layer and the proportion of the ɣ' phase precipitated in the iron nitride compound layer is 40% or more.
Inventors:
SHIMIZU YUICHIRO (JP)
SHIMIZU KATSUSHIGE (JP)
AKIMOTO KIYOTAKA (JP)
SHIMIZU KATSUSHIGE (JP)
AKIMOTO KIYOTAKA (JP)
Application Number:
PCT/JP2016/060657
Publication Date:
October 06, 2016
Filing Date:
March 31, 2016
Export Citation:
Assignee:
DOWA THERMOTECH CO LTD (JP)
International Classes:
C23C8/80; C21D1/06; C23C8/26; C21D9/32; C22C38/00
Foreign References:
| JP2002241922A | 2002-08-28 | |||
| JPS531142A | 1978-01-07 | |||
| JPH11124653A | 1999-05-11 | |||
| JP5669979B1 | 2015-02-18 |
Other References:
DIETER LIEDTKE ET AL., NITRIDING AND NITROCARBURIZING ON IRON MATERIALS, vol. 11, no. 1st edition, 30 August 2011 (2011-08-30), pages 37 - 39 , 131 to 133, 136, 137
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)
Yasushi Hagiwara (JP)
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