Abstract
A 10%Cr martensitic steel for rotor applications, COST FB2, was used in 620°C steam turbines for about four years in China. In order to increase the unit efficiency to 50% of the coal-fired power plant, an advanced 630°C steam turbine developed by DongFang Turbine Co., Ltd will be put into operation in 2021. A three-ton 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 for the prototype rotor, including homogeneity of chemical composition, ultrasonic tests, mechanical properties, and long-term creep behaviors, and microstructure, are presented and discussed.
