It IS UNDERSTOOD THAT the diameter of the ring is 15.6 meters and the weight is 150 tons. It is the first time to realize the grading construction and forming of the 100-ton metal billet. It is also the largest whole forged stainless steel ring with the largest diameter and the largest weight in the world.
With the commission and support of CNNC, Institute of Metals of Chinese Academy of Sciences has formed an industry-university-research team to develop a ring forging with a diameter of 15.6 meters in Shandong Iraite Heavy Industry Co., LTD., which is characterized by no weld, high degree of homogenization and good uniformity of organization. The GIANT RING will be APPLIED TO THE FOURTH GENERATION OF nuclear power units in China. Its successful development will effectively guarantee the implementation of major equipment in the field of nuclear industry.
As the supporting ring of the core component of the fourth generation nuclear power unit, it is not only the boundary and safety barrier of the pressure vessel, but also the "backbone" of the whole reactor vessel, bearing 7000 tons of weight in structure. In the past, such giant forgings were manufactured by multi-segment billet welding abroad, which not only has a long processing cycle and high cost, but also has weak material structure and performance at the weld position, which has hidden safety risks for the operation of nuclear power units.
Cas metal by scientific research personnel after 10 years of hard efforts, has developed the original metal building forming technology and reveals the healing mechanism and evolution mechanism of the interface, break through the large forgings the limits of the "big system" concept, developed the surface activation, vacuum packaging, multidirectional forging and classification, the whole rolling ring series of key technologies, such as The interface between the multi-layer metals is completely eliminated, so that the interface position of the supporting ring forgings is completely consistent with the matrix metal in composition, structure and performance, realizing the new processing and manufacturing of "small and large", greatly improving the quality and reducing the manufacturing cost.
According to the personage inside course of study introduces, this technology has been a number of academicians expert evaluation for a revolutionary innovation in the field of large components manufacture, has been in the field of hydropower, wind power, nuclear power and other important application implementation, to promote the rapid development of high-end equipment, the security of major equipment of the core material independently controllable played a very important role.