Title:
転動疲労寿命特性に優れた軸受鋼、軸受用造塊材並びにそれらの製造方法
Document Type and Number:
Japanese Patent JP5400089
Kind Code:
B2
Abstract:
The present invention provides bearing steel, comprising a chemical composition including by mass %, C: 0.56 % ¤ [%C] ¤ 0.70 %, Si: 0.15 % ¤ [%Si] < 0.50 %, Mn: 0.60 % ¤ [%Mn] ¤ 1.50 %, Cr: 0.50 % ¤ [%Cr] ¤ 1.10 %, Mo: 0.05 % ¤ [%Mo] ¤ 0.5 %, P: [%P] ¤ 0.025 %, S: [%S] ¤ 0.025 %, Al: 0.005 % ¤ [%Al] ¤ 0.500 %, O: [%O] ¤ 0.0015 %, N: 0.0030 % ¤ [%N] ¤ 0.015 %, and remainder as Fe and incidental impurities, wherein "[%M]" represents content (mass %) of component M, "eutectic carbide formation index Ec" represented by following formula (1) is in the range of 0 < Ec ¤ 0.25, and "degree of segregation" represented by following formula (2) is equal to or less than 2.8 in the bearing steel.
In formula (2), C Mo(max) represents the maximum value of Mo intensity value and C Mo(ave) represents the average value of Mo intensity value.
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Inventors:
Honjo 稔
Kazukuni Nagatani
Tatsuki Kimura
3 Shinji Tao
Kazukuni Nagatani
Tatsuki Kimura
3 Shinji Tao
Application Number:
JP2011098664A
Publication Date:
January 29, 2014
Filing Date:
April 26, 2011
Export Citation:
Assignee:
JFE Steel Corporation
NTN Corp.
NTN Corp.
International Classes:
C22C38/00; C21D8/06; C21D9/00; C22C38/22; C22C38/54
Attorney, Agent or Firm:
Kenji Sugimura
Yusuke Yamaguchi
Keisuke Kawahara
Yusuke Yamaguchi
Keisuke Kawahara