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Title:
STEEL MATERIAL
Document Type and Number:
Japanese Patent JP2009161854
Kind Code:
A
Abstract:

To impart an extremely long fatigue life, e.g. an L10 life of 100106 cycles, to a steel material used in a machine part such as a bearing.

The steel comprises, by mass%, 0.95-1.10% C, 0.15-0.35% Si, 0.30-0.50% Mn and 1.30-1.60% Cr. The steel contains inclusions having major axes of 30 m in the number of 35 pieces/kg with roundness of 1.0 but 1.4 and 90 pieces/kg with roundness of 1.4. The steel material is produced using a vacuum high-frequency induction furnace (VIF), an LF device or an RH device.


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Inventors:
MATSUMOTO HIROAKI
MIMURA TAKESHI
KIMURA SEII
Application Number:
JP2008309003A
Publication Date:
July 23, 2009
Filing Date:
December 03, 2008
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
C22C38/00; C21C7/10; C22C38/18
Domestic Patent References:
JP2001342513A2001-12-14
JP2008121035A2008-05-29
JP2002340885A2002-11-27
Attorney, Agent or Firm:
Toshio Yasuda
Mikio Yasuda



 
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