| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas carburizing method and gas carburizing system for shortening carburization time and reducing equipment expenses in subjecting a material to be treated to gas carburization. SOLUTION: A gas carburizing system 60 comprises: a vacuum carburizing section 20 which carburizes the material 50 to be treated with the carburizing gas under and at prescribed pressure and temperature; and a gas carburizing/diffusing section 25 which carburizes and diffuses the carburizing gas under the pressure higher than the prescribed pressure in the vacuum carburizing section and at the temperature equal to or lower than the prescribed temperature. As a result, the CP value of the material is rapidly raised in the section 20 in the initial period of carburization and the carburizing time can be made shorter. Also, the section 20 has a small structure and can suppress the increase of the equipment expenses. COPYRIGHT: (C)2004,JPO
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