The Development Of The Middle Scale Prototype For The Rotor Used In The 630 Degrees C Steam Turbine

The 10%Cr martensitic steel for rotor application like COST rB2 was used in 620 degrees C steam turbines for about four years in China. In order to increase the unit efficient to 50% of the coal-fired power plant, an advanced 630 degrees C steam turbine developed by DongFang Turbine Co.,Ltd will be put into operation in 2021. A 3tons of middle-scale prototype turbine rotor forging(3387FC1) was developed and evaluated through the collaborative work of DongFang Turbine and The Japan Steel Works (JSW) using JMATR, a high-performance heat resistant steel developed by JSW. Test results include homogeneity of chemical composition, ultrasonic test, mechanical properties, and long-term creep behaviors and microstructure of prototype rotor are presented and discussed.