Patent ID: 7156929

Claim:
A cast iron alloy for a cast iron product characterized by high thermal stability, the alloy consisting essentially of, as nonferrous constituents, positive additions of C, Si, Mo, Al, Ni, Mg, Zr, wherein C is present in an amount of less than 2.5to 2.8% by weight, the Si content is 4.7 to 5.2% by weight, the Mo content is 0.5 to 0.9% by weight, the Al content is 0.5 to 0.9% by weight, the Ni content is 0.1 to 1.0% by weight, the Mg content is up to 0.05% by weight and wherein the Zr content is 0.1 to 0.4% by weight, wherein graphite in the as cast iron alloy comprises spheroidal graphite.