一、电站转子锻件对材料性能的要求高、中压汽轮机转子在高温(400～560℃)、高压(≥90大气压)、高速旋转(3000～3600rpm,超速20％时达3600～4320rpm)的条件下工作。因此,要求材料必须具有优越的高温强度和室温机械性能,印高温和室温的抗拉强度高,塑性和韧性好,蠕变强度高,与旋转破坏强度有密切关系的脆性转变温度(FATT)低。为了保证获得具有最佳的蠕变强度和 First, the requirements of the rotor forging material on the performance of the high pressure turbine rotor in the high temperature (400 ~ 560 ℃), high pressure (≥ 90 atm), high-speed rotation (3000 ~ 3600rpm, over speed 20% up to 3600 ~ 4320rpm) conditions Work Therefore, it is required that the material must have excellent high temperature strength and room temperature mechanical properties, high tensile strength at high temperature and room temperature, good ductility and toughness, high creep strength, and low brittle transition temperature (FATT) which is closely related to the rotational breaking strength . In order to ensure that the best creep strength is obtained