| 摘要 |
PROBLEM TO BE SOLVED: To hardly occur the inner part starting point type breakage without developing a large deformation, even in the case of producing a rolling member in the large bearing, such as the bearing for backup roll. SOLUTION: At least one of rolling member among an inner ring 1, an outer ring 2 and a roller 3, is made by applying a carbonizing or a carbonitriding after processing a blank made of a steel into a prescribed shape and further, by applying a cooling at 15°C/min-300°C/min cooling rate, and a quenching and a tempering in this order, an austenite crystal grain diameter in this core part is made to≤19.2μm of the average value and≤5.5 of the standard deviation. COPYRIGHT: (C)2007,JPO&INPIT
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