METHOD FOR PRODUCING SPHEROIDAL GRAPHITE CAST IRON AND VEHICLE COMPONENT USING SAID SPHEROIDAL GRAPHITE CAST IRON

摘要

An object of the present invention is to provide spheroidal graphite cast iron having high properties using a spheroidizing agent containing no rare-earth element. The present invention relates to a method for producing spheroidal graphite cast iron having a specific final composition by subjecting a molten iron to a spheroidization treatment using a spheroidizing agent of an Fe-Si-Mg-Ca-based alloy containing no rare earth element and conducting an inoculation treatment using a first Fe-Si-based inoculant, and then conducting a pouring inoculation treatment with a given amount of a second Fe-Si-based inoculant containing 45 to 75% of Si, 1 to 3% of Ca, and 15 ppm or less of Ba.