Title:
BEARING COMPONENT AND ROLLING BEARING
Document Type and Number:
WIPO Patent Application WO/2014/196428
Kind Code:
A1
Abstract:
These bearing components (11, 12, 13) comprise steel containing carbon in the amount of 0.95-1.1 mass%, inclusive, silicon in an amount less than 0.3 mass%, manganese in an amount less than 0.5 mass%, sulfur in an amount less than 0.008 mass%, chromium in an amount no less than 1.4 mass% and less than 1.6 mass%, with iron and impurities constituting the remainder thereof, and have a carbonitrided layer formed on the surface-layer section including contact surfaces (11A, 12A, 13A) which are the surfaces which contact other components. The average nitrogen concentration in the surface-layer section is 0.3-0.6 mass%, inclusive, and the variation in nitrogen concentration in the surface-layer section is 0.1 mass% or less. The amount of remaining austenite in the surface-layer section is 8 vol% or less. The area ratio of the precipitate in the interior where the carbonitrided layer is not formed is 11% or more.
Inventors:
OHKI CHIKARA (JP)
MATSUBARA YUKIO (JP)
SATO DAISUKE (JP)
MATSUBARA YUKIO (JP)
SATO DAISUKE (JP)
Application Number:
PCT/JP2014/064113
Publication Date:
December 11, 2014
Filing Date:
May 28, 2014
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
OHKI CHIKARA (JP)
MATSUBARA YUKIO (JP)
SATO DAISUKE (JP)
OHKI CHIKARA (JP)
MATSUBARA YUKIO (JP)
SATO DAISUKE (JP)
International Classes:
F16C33/62; C22C38/00; C22C38/18; C23C8/32; F16C19/02; F16C33/32; F16C33/34; C21D1/06; C21D1/76; C21D9/40
Foreign References:
| JP2009185943A | 2009-08-20 | |||
| JPH0867962A | 1996-03-12 | |||
| JP2006200003A | 2006-08-03 | |||
| JP2007277648A | 2007-10-25 | |||
| JP2008267402A | 2008-11-06 |
Other References:
CHIKARA OKI: "Evaluation of Scratched Contact Fatigue Life with Artificial Dent of Carbonitrided SUJ2 Steel Whose Surface Nitrogen Content is Controlled", NTN TECHNICAL REVIEW, no. 78, October 2010 (2010-10-01), pages 20 - 28, XP055252005
CHIKARA OKI: "Estimation of Nitrogen Concentration Distribution for Carbonitrided SUJ2 Steel", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 93, no. 3, 1 March 2007 (2007-03-01), pages 220 - 227, XP055252322, DOI: doi:10.2355/tetsutohagane.93.220
CHIKARA OKI: "Estimation of Nitrogen Concentration Distribution for Carbonitrided SUJ2 Steel", JOURNAL OF THE IRON & STEEL INSTITUTE OF JAPAN, vol. 93, no. 3, 1 March 2007 (2007-03-01), pages 220 - 227, XP055252322, DOI: doi:10.2355/tetsutohagane.93.220
Attorney, Agent or Firm:
Fukami Patent Office, p. c. (JP)
Patent business corporation Fukami patent firm (JP)
Patent business corporation Fukami patent firm (JP)
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