The request for developing more sophisticatedproperties of Spheroidal Graphite Cast Iron resistant to hightemperature are growing storonger year by year. There has howeverbeen no dramatic change in measures for decades under which castiron with a high Si contents would be used as the material resistantto oxidation at high temperatures. For years Mo has thus played amajor role as an additive for the purpose of improving strength athigh temperatures. In previous work, oxidation resistant propertiesat high temperature were studied by using the high Si contents (4.0%) S. G. cast iron specimens (test pieces) with co-composition of0.6 % Ni, 0.2 % Cr, and 0.5 % Cu. 0.2 % Cr of molten iron ofadded solely showed the best improvement in all the datainvestigated throughout our fundamental experiments. The effectsof Si, Cr and RE were studied as additives for improving resistantproperties against high temperature in this work, while co-composition was also studied to meet demands for thedevelopment of high quality S. G. Cast lron.
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