Heat resistant steel casting is a nickel, iron, or cobalt as matrix element, into a variety of alloy elements and become stable face-centered cubic austenite structure of high temperature alloy.Nickel-based superalloy matrix elements are nickel, iron base of high temperature alloy matrix elements is iron, cobalt base superalloy matrix element is cobalt.Nickel without allotropic structure, normal temperature and high temperature is face-centered cubic structure, namely austenitic structure, and at the time of the high temperature iron, cobalt with face-centered cubic structure, body centered cubic respectively at room temperature, and close the six-party structure.Therefore, to get a relatively stable iron base, high temperature alloys cobalt-based austenite structure, usually need to add a certain amount of nickel and chromium, in order to obtain high chemical stability and oxidation resistance, corrosion resistance, add a small amount of cobalt in high temperature iron base alloy, also can make alloy has better resistance to corrosion.