发明申请
US20070169850A1 Rolling bearing and heat treatment method for steel 失效
钢的滚动轴承和热处理方法

  • 专利标题: Rolling bearing and heat treatment method for steel
  • 专利标题(中): 钢的滚动轴承和热处理方法
  • 申请号: US10586299
    申请日: 2005-01-11
  • 公开(公告)号: US20070169850A1
    公开(公告)日: 2007-07-26
  • 发明人: Chikara OhkiKohei Fujita
  • 申请人: Chikara OhkiKohei Fujita
  • 优先权: JP2004-007568(P) 20040115
  • 国际申请: PCT/JP05/00170 WO 20050111
  • 主分类号: C23C8/00
  • IPC分类号: C23C8/00 C23C22/00
Rolling bearing and heat treatment method for steel
摘要:
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).
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