The structures of standard heat treatment of the alloy have the phases of gamma, gamma prime, MC,M6C and M3B2.The first temperature rang of grain growth is about 1150-1170℃. The second is 1210℃. The maximum precipitation peak of main carbide phase M6C is about 1000℃, and two kinds of M6C differentiated between in compositions has been found in the tested alloys.The standard heat trearment of the alloy do not get two kinds of gamma prime phase in size, but the isothermal treatment can get two kinds of gamma ...