| 摘要 |
PROBLEM TO BE SOLVED: To provide a nitrosulphurizing method to generate nitrides and sulfides of the surface of steel parts without using any toxic cyanic compound or hydrogen sulfide. SOLUTION: Gas nitriding of gas soft nitriding is applied on steel parts W in a reaction furnace 1 using gaseous ammonium, and then, the reaction furnace 1 is evacuated to discharge the residual gas after nitriding. Then, the gas containing sulfur compounds (CS2) but containing no sulfur gas (S) or hydrogen component is supplied into the reaction furnace 1 to apply the gas sulphurizing on the steel parts W of a work, but H2S is not used. Even if ammonia is decomposed in the nitriding treatment to generate H2, H2 is discharged through evacuation, and no H2S is generated through the reaction with sulfur during the sulphurizing treatment.
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