Title:
BEARING MEMBER EXCELLENT IN CHARACTERISTIC OF RETARDING MICROSTRUCTURAL CHANGE DUE TO REPEATED STRESS LOAD AS WELL AS HEAT TREATMENT PRODUCTIVITY
Document Type and Number:
Japanese Patent JP3243372
Kind Code:
B2
Abstract:
PURPOSE: To provide a bearing member, in which heat treatment decarburized layer is inhibited and rolling fatigue life is improved, by specifying the chemical composition of a steel material and controlling the amount of retained austenite in a structure.
CONSTITUTION: This steel material consists of, by weight, 0.5-1.5% C, >0.5-2.5% Si, 0.001-0.015% Sb, 0.005-0.07% Al, ≤0.0020% O, and the balance Fe with inevitable impurities and can further contain one or ≥2 kinds selected from 0.05-2.0% Mn, 0.05-2.5% Cr, 0.05-1.0% Ni, 0.05-0.5% Mo, 0.05-1.0% Cu, 0.0005-0.01% B, and 0.0005-0.012% N. Moreover, a steel structure in which the amount of retained austenite in the steel is regulated, by volume ratio, to 10-35% is formed. By this method, heat treatment decarburized layer can be inhibited by the effect of Sb addition and a microstructural change due to repeated stress load in a bearing member can be retarded by the effects of the combined addition of Si and Sb and the retained austenite, and rolling fatigue life can be improved.
Inventors:
Satoshi Yasumoto
Toshiyuki Hoshino
Akihiro Matsuzaki
Kenichi Amano
Toshiyuki Hoshino
Akihiro Matsuzaki
Kenichi Amano
Application Number:
JP11488994A
Publication Date:
January 07, 2002
Filing Date:
May 27, 1994
Export Citation:
Assignee:
Kawasaki Steel Co., Ltd.
International Classes:
F16C33/62; C22C38/00; C22C38/60; (IPC1-7): C22C38/00; C22C38/60
Domestic Patent References:
| JP6357749A | ||||
| JP3122255A | ||||
| JP4947212A | ||||
| JP356640A | ||||
| JP426752A | ||||
| JP230733A | ||||
| JP6271977A |
Attorney, Agent or Firm:
Junzo Ogawa (1 person outside)
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