On March 20th, TGJT made high-purity stainless steel materials to produce the world's largest and largest welded stainless steel ring-free forgings with the largest diameter in the world. It will be used to make China's first fourth-generation nuclear power unit-Fujian Xiapu 600,000 kilowatts. Support ring for core components of fast neutron demonstration reactor.
The fast reactor is the second step in the "three steps" of China's nuclear energy development "thermal reactor-fast reactor-fusion reactor" strategic line. It belongs to the preferred reactor type of the fourth-generation advanced nuclear energy system in the world and can greatly improve the use of nuclear fuel resources. rate. As the "spine" of the whole stack container, the giant ring forging has a diameter of 15.6 meters and weighs 150 tons. It is required to withstand a weight of 7,000 tons in structure, withstand high temperatures of 650 ° C, and run continuously for forty years.
In the past, such giant forgings at home and abroad were manufactured by multi-section billet assembly welding, and the material organization and performance of the weld seam location was weak, which posed a hidden safety hazard to the operation of nuclear power units. The Institute of Metals of the Chinese Academy of Sciences pioneered the process of "making small by large", using 58 high-purity stainless steel continuous casting slabs to superimpose and forge the 100-ton-level original blank required for the ring, which solved the solidification of steel ingots in the traditional "big by large" process. Problems inherent in metallurgical processes.
Harsh use conditions and new processing techniques have presented unprecedented challenges to the chemical composition and uniformity of the required continuous casting slabs. TGJT cooperates with the Chinese Academy of Atomic Energy Research Institute and the Institute of Metal Research of the Chinese Academy of Sciences to carry out comprehensive technical research. Through breakthroughs in smelting and continuous casting processes, the material has high temperature and corrosion resistance, steel purity, and uniform internal organization. Indicators such as performance, dimensional accuracy, etc. have reached new heights. They have mastered the manufacturing technology of a series of products such as stainless steel plates, continuous casting slabs, and electroslag ingots for key equipment of fast reactors, and have mass production capabilities, which strongly supports this "world of The most successful development.