| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a rolling bearing excellent in wear resistance and seizure resistance and having a long life even when used in a severe condition such as a high-speed rotation condition and lubrication environment with foreign matter mixed therein. <P>SOLUTION: A rolling element 3 for a deep groove ball bearing is formed of steel containing silicon and manganese, in which the content of silicon in the steel is 0.4 mass% or more, the content of manganese is 0.4 mass% or more and the sum of the silicon content and the manganese content is 1 mass% or more. Nitriding or carbonitriding processing, quenching, tempering and shot peening are sequentially performed. In the rolling element 3 thus manufactured, Si-Mn system nitrides having the maximum diameter of 1μm or less separate out in a surface layer portion from the surface to a depth of 0.05 mm and has an amount of 1% or more but not exceeding 10% in area ratio. The amount of residual austenite in the surface layer portion exceeds 0 vol% but does not exceed 30 vol% and residual compressive stress in the surface layer portion is 500 MPa or more but does not exceed 1,500 MPa. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
