Title:
ROLLER OR BALL IN BEARING HAVING EXCELLENT ROLLING FATIGUE PROPERTY AND CRUSHING STRENGTH, AND BEARING
Document Type and Number:
Japanese Patent JP2008088482
Kind Code:
A
Abstract:
To provide a roller or a ball having an improved rolling fatigue life, and further, having improved crushing strength, and to provide a bearing using the same.
In the roller or ball of a bearing using a bearing steel as the stock, the retained austenite grain size of the steel structure from the surface at least to a depth position of 1.5 mm is controlled to 3.5 m. For obtaining the steel structure in a transferring section, treatment where the stock is heated to a two phase region of austenite and spheroidized carbides, is thereafter rapidly cooled, and is quenched is performed for two or more times.
Inventors:
HIRAI YASUMASA
HINO YOSHIMICHI
TOYOOKA TAKAAKI
HINO YOSHIMICHI
TOYOOKA TAKAAKI
Application Number:
JP2006268720A
Publication Date:
April 17, 2008
Filing Date:
September 29, 2006
Export Citation:
Assignee:
JFE STEEL KK
International Classes:
C22C38/00; C21D9/36; C21D9/40; F16C33/32; F16C33/34; C21D8/06; C22C38/60
Attorney, Agent or Firm:
Kosaku Sugimura
Shiro Fujitani
Kiyoshi Kuruma
Shiro Fujitani
Kiyoshi Kuruma
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