发明申请
US20160178009A1 BEARING PART, ROLLING BEARING, AND METHOD OF MANUFACTURING BEARING PART 有权
轴承部件,滚动轴承及其制造方法

BEARING PART, ROLLING BEARING, AND METHOD OF MANUFACTURING BEARING PART
摘要:
An outer ring, an inner ring, and a ball each serving as a bearing part is made of a steel containing 0.95 mass % or more and 1.10 mass % or less of carbon, 0.05 mass % or more and less than 0.3 mass % of silicon, 0.10 mass % or more and 0.50 mass % or less of manganese, and 1.30 mass % or more and 2.00 mass % or less of chromium, with the rest made up of iron and an impurity. A surface layer region defined as a region extending to a depth of not more than 20 μm from an outer ring raceway surface, an inner ring raceway surface, and a ball rolling surface, which are each a surface where the bearing part is in rolling contact with another part, has an average nitrogen concentration of 0.2 mass % or more and 0.7 mass % or less. Five or more carbides with a diameter of 0.5 μm or less are present per 100 μm2 in the surface layer region.
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