NODULAR GRAPHITE CAST IRON WITH HIGH STRENGTH AND HIGH TOUGHNESS AND PARTS OF AN AUTOMOBILE MANUFACTURED FROM THE SAME

摘要

The present invention provides a spheroidal graphite cast iron which comprises 3.2-3.8 wt% of carbon (C), 2.6-3.3 wt% of silicon (Si), 0.1-0.5 wt% of manganese (Mn), 0.4-0.8 wt% of copper 0.001-0.03 wt.% Of Sn, 0.001-0.03 wt.% Of bismuth, and iron (Fe) of unavoidable impurities and residual amount, and an automobile part made of the same.