PROCESS FOR PRODUCING SPHEROIDAL-GRAPHITE CAST IRON, AND SPHEROIDAL-GRAPHITE CAST IRON MEMBER OBTAI

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The purpose of the present invention is to provide : a process for producing a spheroidal-graphite cast iron having high properties using a spheroidizing agent that contains no rare-earth element; and a spheroidal-graphite cast iron member comprising the spheroidal-graphite cast iron. The invention relates to obtaining a spheroidal-graphite cast iron having high properties and a spheroidal-graphite cast iron member by subjecting an iron melt to a spheroidization treatment with a spheroidizing agent comprising an Fe-Si-Mg-Ca alloy that contains a given amount of barium and contains substantially no rare-earth element, a first inoculation treatment, and a melt-stream inoculation treatment.