| 摘要 |
PROBLEM TO BE SOLVED: To provide a hypoeutectic spheroidal graphite cast iron without crystallization of a free cementite as cast, small in area percentage of crystallized graphite, high in spheroidal graphite rate and having high Young modulus.SOLUTION: There is provided a hypoeutectic spheroidal graphite cast iron having a component composition containing C:1.5 to 2.7%, Si:1.0 to 3.0%, carbon equivalent:2.2 to 3.4%, Al:0.01 to 0.2%, Mg:0.015 to 0.060% and the balance Fe, spherical graphite rate in a substrate of 80% or more, graphite area percentage of 9% or less and Young modulus of 180 GPa or more.SELECTED DRAWING: None |
