Method of manufacturing a thin-walled spherical graphite cast iron and automotive parts, as well as thin-walled spheroidal graphite cast iron using this

摘要

PURPOSE: To produce a thin-walled spheroidal graphite cast iron minimal in the occurrence of chill and also to produce automobile parts by using this material. ;CONSTITUTION: The thin-walled spheroidal graphite cast iron has a composition consisting of, by mass ratio, 3.0-4.0% C, 1.5-2.4% Si, 0.3% Mn, 0.05% P, 0.009-0.016% S, 0.02-0.06% Mg, 5-60ppm Bi, and the balance Fe with inevitable impurities and further has a chilled carbon equivalent (CEc) represented by equation, CEc=C%+αSi%, where 1α≤2 is satisfied. By this method, the sound thin-walled spheroidal graphite cast iron, in which the occurrence of chill in the thin-walled part of ≤3mm thickness in an as-cast state is controlled to ≤2%, can be obtained.;COPYRIGHT: (C)1996,JPO