| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-carbon spheroidal graphite cast iron which can be used for a refractory casting, and has a stable matrix with little variations of mechanical properties such as tensile strength, dilation, and hardness. SOLUTION: The high carbon spheroidal graphite cast iron includes, by weight ratio, 4-4.8% C, 1.7% or less Si, 0.5-1.0% Mn, 0.035-0.1% Mg, and the balance substantially Fe, and has a spheroidal graphite rate of 60% or higher.
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