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

摘要

PURPOSE: To produce bearing steel high in heat treating productivity and small in the change of the microstructure casued by repeated stress loads under severe using conditions. ;CONSTITUTION: The bearing steel contg., by weight, 0.001 to 0.015% Sb for improving heat treating productivity and contg., particularly, 1.0 to 3.0% Ni and one or two kinds selected from 0.5 to 2.5% Si, 0.02 to 0.5% Zr, 0.02 to 0.5% Ta, 0.02 to 0.5% Hf, 0.05 to 1.5% Co and 0.012 to 0.050% N as B₅₀ high load rolling fatigue life improving components for promoting the delay in the change of the microstructure caused by repeated stress loads is produced.;COPYRIGHT: (C)1994,JPO