Patent ID: 9206490
Filing Date: 2015-12-08
Classification: C21D,C22C,C23C,F16C

Abstract:
1. A bearing part, wherein the bearing part is made of a quench-hardened steel containing not less than 0.90 mass % and not more than 1.05 mass % of carbon, not less than 0.15 mass % and not more than 0.35 mass % of silicon, not less than 0.01 mass % and not more than 0.50 mass % of manganese, and not less than 1.30 mass % and not more than 1.65 mass % of chromium with the rest consisting of an impurity, the bearing part has a contact surface, which is a surface that makes contact with another part and has a nitrogen concentration of not less than 0.25 mass %, and a remaining austenite amount in said contact surface is not less than 6 volume % and not more than 12 volume %.