Title:
BEARING STEEL
Document Type and Number:
Japanese Patent JP2883460
Kind Code:
B2
Abstract:
PURPOSE: To provide a bearing steel having a long service life for which the coarsening of austenitic crystalline grains is prevented.
CONSTITUTION: This steel contains, by weight, 0.65 to 0.90% C, 0.15 to 0.50% Si, 0.15 to 1.00% Mn, 2.0 to 5.0% Cr and 0.0090 to 0.0200% N and furthermore contains one or two kinds of 0.010 to 0.050% Al and 0.005 to 0.50% Nb, and the balance Fe with inevitable impurities. As necessary, one or ≥ two kinds among 0.20 to 0.50% Ni, 0.10 to 2.00% Mo and 0.05 to 1.00% V may be incorporated. In such a manner, the content of C is reduced and, furthermore, the formation of harmful white layers is prevented by the effect of suppressing the diffusion of carbon atoms mainly by the incorporation of Cr to prolong its rolling service life and the coarsening of austenitic crystalline grains is prevented by Al, Nb and N.
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Inventors:
TAKADA YATSUKA
MUROGA HIROSHI
GOTO MASAO
KAWAGUCHI TOSHIHIRO
HOSHINO TERUO
KITAMURA MASAYUKI
NATSUME YOSHITAKA
MIZUTANI TERUHIRO
MUROGA HIROSHI
GOTO MASAO
KAWAGUCHI TOSHIHIRO
HOSHINO TERUO
KITAMURA MASAYUKI
NATSUME YOSHITAKA
MIZUTANI TERUHIRO
Application Number:
JP6564491A
Publication Date:
April 19, 1999
Filing Date:
March 05, 1991
Export Citation:
Assignee:
KOYO SEIKO KK
DENSOO KK
DENSOO KK
International Classes:
C22C38/00; C22C38/18; (IPC1-7): C22C38/00; C22C38/18
Attorney, Agent or Firm:
Ryohei Kobayashi