| 摘要 |
PROBLEM TO BE SOLVED: To make a high-quality surface-treated cast iron article which need not to be rustproofed by densifying the oxide film formed on the surface of the article by inhibiting the formation of a dispersion in the oxide film and inhibiting violent oxidation. SOLUTION: An electric furnace 1 equipped with a furnace chamber 2 in which a cast article S is held and an electric heater 4 that heats the inside of the chamber 2 is used. The article S is held in the chamber 2, the inside of the chamber 2 is filled with inert gas, and the article S is heat-treated at a temperature of 700 to 930°C at the chamber 2 in an oxygen concentration of 0.1 to 5%, desirably, 0.5 to 1.5%, for 5 to 30 min, desirably, 12 to 15 min. COPYRIGHT: (C)2004,JPO&NCIPI
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