INOCULANT FOR SPHEROIDAL GRAPHITE CAST IRON AND PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To restrain the brittleness of a cast iron product by suppressing the increase of silicon content in a spheroidal graphite cast iron caused by the increase of consumption of Fe-Si base inoculant and to promote ferritizaiton as-cast, keeping the same silicon content in the cast iron as the conventional method, and effectively utilizing the graphitization performance of SiC. SOLUTION: This inoculant for spheroidal graphite cast iron in contact with molten iron at the treatment into the molten spheroidal graphite cast iron, is obtained by complexing SiC powder and at least Fe-Si base alloy. The inoculant can uniformly be dispersed in the molten metal without deviation in the molten iron surface caused by float-up the same with SiC powder. Therefore, the inoculating effect (graphitization promoting performance) can effectively be attained.