HEAT RESISTANT SPHEROIDAL GRAPHITE CAST IRON WITH EXCELLENT CREEP RESISTANCE

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Heat resistant spheroidal graphite cast iron with excellent creep resistance that contains, in mass%, C : 3.0%-4.3%, Si : 1.5% to less than 3.0%, Mn : 0.4% or less, a graphite spheroidizing agent made of at least one of Mg, mischmetal, Ce and Ca : 0.010-0.15%, P : 0.20% or less, S : 0.050% or less, Ni : 0.50-1.5%, Cu : 0.20% to less than 0.8%, and Mo : 0.50-1.5%, the balance being made of Fe and unavoidable impurities.