The development of ultra supercritical coal-fired thermal power technology is the most realistic, feasible, economical and effective way to reduce CO2 emission of thermal power. High temperature components of advanced ultra supercritical unit need to use nickel based heat resistant alloy. In view of the demand of national key material technology upgrading and industrialization, the research group is led by the general iron and Steel Research Institute and composed of Fushun Special Steel Co., Ltd., Yangzhou Chengde Steel Pipe Co., Ltd., Shanghai Boiler Works Co., Ltd. and Beijing University of science and technology to jointly tackle key problems, and solve the strengthening and toughening mechanism of new type C-HRA-2 / C-HRA-3 nickel based heat resistant alloy for advanced ultra supercritical thermal power units Major scientific issues such as the principle of long-term aging structure and performance stability at service temperature, the control factors of microstructure and performance uniformity of large nickel base heat-resistant alloy forgings, and breakthroughs in key technologies such as composition optimization and narrow composition range precision control technology, low segregation control technology, fine heat processing and heat treatment, A complete set of production technology integration of C-HRA-2 / C-HRA-3 nickel based heat-resistant alloy and forgings was developed to form an independent technological process system with intellectual property rights. Typical demonstration forgings were produced, meeting the requirements of extrapolation ≥ 100MPa for C-HRA-2 alloy at 675 ℃ 100000 hours and extrapolation ≥ 100MPa for C-HRA-3 alloy at 700 ℃ 100000 hours.
