| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment method of a metal product, by which the fatigue strength of a metal product, subjected to a carbonitriding treatment, is enhanced. SOLUTION: The surface treatment method includes a step (S1) for performing a carbonitriding treatment to a machined metal product and a step (S2) for heating the metal product after the carbonitriding treatment at 300-400°C for two or more hours. COPYRIGHT: (C)2011,JPO&INPIT |
