Systematical Innovation of Heat Resistant Materials Used for 630∼700 °C Advanced Ultra-Supercritical (A-USC) Fossil Fired Boilers

To date, the 600 degrees C ultra-supercritical (USC) fossil fired power plant is the most advanced in the world. The research and development of 630 similar to 700 degrees C advanced ultra-supercritical (A-USC) fossil fired power plant will lay the thermal power technology in China in the international leading position, which is of important strategic significance to realize the national energy conservation and emissions reduction targets. Heat resistant material is the technical necking to further increase the steam parameter of thermal power plants. This paper briefed the-state-of-the-art of heat resistant materials used for 630 similar to 700 degrees C A-USC fossil fired power plant worldwide and clarified the critical candidate materials which are on the top priority to develop in China. The selective metallurgical processing design and selective strengthening mechanism, concluded by the author to design and improve heat resistant materials, was introduced. Under the guidance of the selective strengthening mechanism, G115 (R) martensitic steel used for 630 similar to 650 , C-HRA-2 (R) and C-HRA-3 (R) alloy used for 650 similar to 700 , and C-HRA-(R) alloy used for 700 similar to 750 degrees C have been successfully developed, which built a complete heat resistant material system to cover 630 similar to 700 degrees C A-USC fossil fired power plant. The boiler tubing and piping of these novel heat resistant materials have been industrially manufactured.