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Title:
PROCESS FOR PRODUCTION OF CARBONITRIDED MEMBER
Document Type and Number:
WIPO Patent Application WO/2011/030827
Kind Code:
A1
Abstract:
Disclosed is a process for producing a carbonitrided member using a base steel material comprising (in mass%) 0.10 to 0.35% of C, 0.15 to 1.0% of Si, 0.30 to 1.0% of Mn, 0.40 to 2.0% of Cr, 0.05% or less of S, and optionally 0.50% or less of Mo, with the remainder being Fe and impurities. The process comprises carburizing the base steel material by retaining the base steel material in a carburizing atmosphere at a temperature of 900 to 950˚C, carbonitriding the resulting product by retaining the resulting product in a carbonitriding atmosphere having a nitrogen potential of 0.2 to 0.6% at a temperature of 800 to 900°C, quenching the carbonitrided product, and subjecting the quenched product to a shot peening treatment. The process enables the production of a carbonitided member having excellent abrasion resistance, high pitting strength and excellent flexural fatigue strength even when an inexpensive steel having a low Mo content or containing no Mo is used as a base material. After the quenching, the quenched product may be subjected to the shot peening treatment while heating the quenched product at a temperature of 350°C or lower or immediately after heating the quenched product at a temperature of 350°C or lower. After the quenching, the quenched product may be annealed at a temperature ranging from higher than 250°C and not higher than 350°C and subsequently subjecting the annealed product to the shot peening treatment.

Inventors:
SANO, Naoyuki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
佐野 直幸 (〒41 大阪府大阪市中央区北浜四丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
HORIMOTO, Masayuki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
堀本 雅之 (〒41 大阪府大阪市中央区北浜四丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
OKADA, Yoshinari (4-1, Chuo 1-chome, Wako-sh, Saitama 93, 〒3510193, JP)
Application Number:
JP2010/065532
Publication Date:
March 17, 2011
Filing Date:
September 09, 2010
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目5番33号 Osaka, 〒5410041, JP)
HONDA MOTOR CO., LTD. (1-1 Minami-Aoyama 2-chome, Minato-ku Tokyo, 56, 〒1078556, JP)
本田技研工業株式会社 (〒56 東京都港区南青山二丁目1番1号 Tokyo, 〒1078556, JP)
SANO, Naoyuki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
佐野 直幸 (〒41 大阪府大阪市中央区北浜四丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
HORIMOTO, Masayuki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
International Classes:
C23C8/32; C21D1/06; C21D1/76; C21D7/06; C21D9/32; C22C38/00; C22C38/60; C23C8/80
Foreign References:
JPH05255731A1993-10-05
JP2006281343A2006-10-19
Other References:
SHIGEO OWAKU JIS TEKKO ZAIRYO NYUMON 10 February 1997, page 56
Attorney, Agent or Firm:
SUGIOKA, Kanji et al. (K. SUGIOKA PATENT OFFICE, 2-5-10 Sonezaki, Kita-ku, Osaka-sh, Osaka 57, 〒5300057, JP)
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