| 摘要 |
PROBLEM TO BE SOLVED: To provide a carburizing method by which the generation of an excessively carburized structure in a carburized member comprising steel containing Cr in a content of≥3.5 mass%, especially in a corner part of the carburized member can be suppressed. SOLUTION: The carburizing method comprises a formed member preparing process for preparing a formed member comprising steel containing Cr in a content of≥3.5 mass%, and a vacuum carburizing process for reducing the pressure in a furnace to reduce the amount of oxygen in the atmosphere in the furnace, then allowing a carburizing gas to flow in the furnace to make the inside of the furnace into an atmosphere in which the carburizing treatment can be performed, and subjecting the formed member to a carburizing treatment in the chamber. The vacuum carburizing process comprises a temperature-raising step for raising the temperature of the formed member to a temperature at which the formed member can be carburized and a carburizing step for executing carburizing of the formed member whose temperature is raised to the temperature at which the formed member is carburized in the temperature-raising step. In the carburizing step, the carburizing is carried out at 850-940°C. COPYRIGHT: (C)2007,JPO&INPIT
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