BEARING STEEL OF EXCELLENT ROLLING SERVICE LIFE UNDER ENVIRONMENT WITH FOREIGN MATTERS MIXED THEREIN

摘要

PROBLEM TO BE SOLVED: To provide inexpensive bearing steel having excellent rolling service life characteristic under the environment with foreign matters mixed therein only by applying hardening and annealing thereto without carbo-nitriding.;SOLUTION: The bearing steel has a composition consisting of, by weight, 0.8-1.2% C, 1.0% Si, 1.5-3.5% Mn, 0.03% P, 0.03% S, 0.3-2.5% Cr, 0.005-0.050% Al, 0.003% Ti, 0.0015% O and 0.015% N, and further, one or two or more kinds of 0.1-3.0% Ni, 0.05-1.00% Mo and 0.05-1.0% V as necessary, and the balance Fe with inevitable impurities. The surface hardness after the hardening and annealing becomes 58 HRC, and the residual austenite is 20-45%.;COPYRIGHT: (C)2004,JPO