| 摘要 |
PROBLEM TO BE SOLVED: To provide a low thermal expansion cast alloy in which the defects of the conventional low thermal expansion material are solved, and which has a sufficiently low thermal expansion coefficient and satisfactory castability, and whose thermal expansion is extremely reduced by the application of suitable heat treatment after casting. SOLUTION: The low thermal expansion cast alloy has a componential composition containing, by weight, 25.0 to 32.0% Ni, 7.0 to 14.0% Co, 0.3 to <1.0% C, <0.5% Si and <0.3% Mn, and containing 0.01 to 0.06% rare earth elements as well, and the balance substantially Fe. In the cast alloy, on casting, spheroidization treatment of graphite and deoxidation/degassing treatment are performed.
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