Structure stability study on fossil power plant advanced heat-resistant steels and alloys in China

This overiew paper summarizes part of structure stability study results in China on advanced heat-resistant steels, nickel-iron and nickel base superalloys such as 12Cr2MoWVTiB(GY102), ferritic steel, Super 304H austenitic steel, GH2984, Nimonic 80A and INCONEL 740 superalloys for fossil power plant, application. China had established first USC power plant with steam parameters of 650 degrees C and 25 MPa in the year of 2006..Austenitic heat-resistant steel Super 304H is mainly used as boiler superheater and reheater material. Ni-Cr-Fe base superalloy GH2984 was used as tube material for marine power application. Ni-Cr-Co type INCONEL 740 has been studied in a joint project with Special Metals Corp., USA for European USC model power plant with the steam temperature of 700 degrees C. Nimonic 80A has been used as several stage USC steam turbine bucket material at 600 degrees C in China. Structure, stability study of Nimonic 80A shows its possibility of 700 degrees C application for USC steam turbine buckets.