Patent ID: 6866726
Filing Date: 2005-03-15
Classification: C21D,C22C

Abstract:
1. A non-austemper-treated spheroidal graphite cast iron obtainable without being subjected to an austemper treatment, characterized in that the non-austemper-treated spheroidal graphite cast iron has a tensile strength of 650-850 MPa and an elongation of 7.0-14.5%, wherein the spheroidal graphite cast iron consists essentially of 0.05 to 0.45% by mass Mn, 2.0 to 4.0% by mass Ni, 3.1 to 4.0% by mass C, 1.8 to 3.0% by mass Si, up to 0.05% by mass P, up to 0.02% by mass S, 0.02 to 0.06% by mass Mg, and the balance Fe.