| abstract |
A method of manufacturing a machine component includes the steps of preparing a member made of steel containing 0.1 mass % or more of vanadium (S10), forming a film containing vanadium at a surface of the member (S20), and forming a nitrogen-enriched layer by heating the member having the film formed in a heat treatment gas atmosphere containing nitrogen gas and absent of ammonia gas (S30). In the step of forming a film (S20), the member is heated to and oxidized in a temperature range not lower than 500°C and lower than A 1 transformation point of steel. |