The Chinese Academy of Sciences recently announced that using the metal construction forming technology developed by the Institute of Metal Research, Chinese Academy of Sciences, the world's largest weldless stainless steel ring forging has been successfully rolled.
It is understood that the ring has a diameter of 15.6 meters and a weight of 150 tons. For the first time, a 100-ton metal billet has been graded and formed. This is also the largest forged stainless steel ring in the world with the largest diameter and the largest weight.
Entrusted and supported by China National Nuclear Corporation where the Chinese Academy of Sciences is located, an industry-university-research team was formed to apply TISCO's high-purity continuous casting slabs to a circular forging with a diameter of 15.6 meters at Shandong Elite Heavy Industry Co., Ltd. High degree of transformation and good organization uniformity. The giant ring will be used in China's fourth-generation nuclear power unit, and its successful development will effectively guarantee the implementation of major equipment in China's nuclear industry.
As the supporting ring for the core components of China's fourth-generation nuclear power generating units, it is not only the pressure vessel boundary and safety barrier, but also structurally bears a weight of 7,000 tons, which is the "spine" of the entire stack container. In the past, such giant forgings were manufactured by multi-stage small billet assembly welding abroad. Not only the processing cycle is long and the cost is high, but also the material organization performance of the weld seam is weak, which lays hidden safety hazards for the operation of the nuclear power unit.
After more than ten years of hard work, the researchers of the Institute of Metal Research of the Chinese Academy of Sciences have developed the original metal structure forming technology and revealed the healing mechanism and organization evolution mechanism of the structure interface. It has broken through the limitation of the "forge large" concept of large forgings and developed The series of key technologies such as surface activation, vacuum packaging, multi-directional forging, graded construction, and integral rolling ring completely eliminate the interface between multiple layers of metal, so that the position of the construction interface of the supporting ring forging is completely consistent with the base metal in composition, organization, and performance , Achieved a new type of "manufacturing from small to large" manufacturing, greatly improved quality while reducing manufacturing costs.
According to industry insiders, this technology has been evaluated by many academicians and experts as a transformative innovation in the field of large component manufacturing, and has been applied in important fields such as hydropower, wind power, nuclear power, etc., which guarantees the rapid development of high-end equipment in China. The independent and controllable core materials of major equipment have played a very important role.
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