Title:
鋼の熱処理方法および軸受部品の製造方法
Document Type and Number:
Japanese Patent JP4540351
Kind Code:
B2
Abstract:
There is provided a rolling bearing which has long life against rolling fatigue and exhibits no decrease in fracture strength and no increase in rate of dimensional change over time, even if the part size thereof is large, and which can obtain higher strength by crystal grains being further refined, if it has a size equal to or smaller than a prescribed size. The rolling bearing according to the present invention includes a race and a rolling element. At least one member of the race and the rolling element has a nitrogen-enriched layer in its surface layer, and a surface layer portion contains austenite crystal grains having a grain size number of at least 11. The member has hardenability allowing a position exhibiting HRC50 in a hardenability test method for steel to be apart from a quenched end by a distance of at least 12.7 mm (8/16 inch).
Inventors:
Riki Oki
Kohei Fujita
Kohei Fujita
Application Number:
JP2004007568A
Publication Date:
September 08, 2010
Filing Date:
January 15, 2004
Export Citation:
Assignee:
ntn corporation
International Classes:
F16C33/62; C21D1/06; C21D9/40; C22C38/00; C22C38/18; C23C8/26; F16C33/30; F16C33/32; F16C33/34; F16C33/64; C21D1/18; C21D1/78; C21D9/36
Domestic Patent References:
| JP2003226919A | ||||
| JP2001123244A | ||||
| JP11303874A |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Seiichi Watanabe
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Seiichi Watanabe