Is superior in heat treatment productivity and delay quality of the microstructure change due to repeated stress load the bearing steel

摘要

PURPOSE: To reduce working load at the time of heat treatment, to retard the change in microstructure due to repetitive stress load, and to improve heavy load rolling fatigue life by specifying respective contents of C, Nb, Sb, 0, Si, Mn, Mo, Cr, Ni, etc. ;CONSTITUTION: This bearing steel has a composition consisting of, by weight, 0.5-1.5% C, 0.05-1% Nb, 0.001-0.015% Sb, ≤0.002% O, and the balance Fe or further containing, besides the above, one of more kinds selected from among 0.05-0.5% Si, 0.05-2% Mn, 0.05-0.5% Mo, 0.05-2.5% Cr, 0.05-i% Ni, 0.05-1% Cu, etc. Working load at the time of heat treatment is reduced in this bearing steel and the change in microstructure resulting from repetitive stress load can be retarded, and service life can be prolonged.;COPYRIGHT: (C)1994,JPO