| 摘要 |
PROBLEM TO BE SOLVED: To provide a cast iron material which maintains high strength sufficiently corresponding to the request for the increase in strength in the cast iron material by eliminating the defects of the conventional cast iron material, and also has sufficiently excellent workability, and to provide its production method. SOLUTION: Cast iron converted into white cast iron is subjected to a heat treatment so as to be held at 700 to 900°C for 5 to 60 min, and thereafter to be rapidly cooled, and is next subjected to a heat treatment so as to be held at 850 to 1,000°C for 20 to 60 min. Further, the cast iron converted into white cast iron is produced by a half-melt molding method. The cast iron has a composition containing, by weight, 1.8 to 2.5% C and 1.4 to 3.0% Si, and the balance substantially Fe. COPYRIGHT: (C)2006,JPO&NCIPI
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