China’s Taiyuan Iron & Steel Group (TISCO) announced Tuesday that it has produced a huge seamless circular forging with high-purity stainless steel, which will be used in a 4th-generation nuclear power unit. According to the company, the piece, 15.6 meters in diameter and 150 tonnes in weight, is the world’s largest in terms of size and weight. It will be used as the support ring for the core component of the pilot reactor for a 60 million kilowatts fast neutron reactor in Xiapu, Fujian Province. The forging is required to be able to bear a weight of 7,000 tonnes and a temperature of 650 degrees Celsius, and operate for four decades continuously. TISCO, located in Taiyuan of Shanxi Province, has supplied more than 50,000 tonnes of steel for nuclear power projects, including 45,000 tonnes of stainless stee
JINAN — A Chinese steel mill rolled off the world’s largest seamless ring forging piece, which was developed especially as the key part of a nuclear power unit. The loop-shape stainless steel piece, produced by the Shandong Iraeta Heavy Industry Co Ltd based in east China’s Shandong Province, weighs 150 tonnes and is 15.6 meters in diameter, breaking both the world records of its kind.The product was developed by the Institute of Metal Research under the Chinese Academy of Sciences and ordered by the China National Nuclear Corporation.It is expected to play the supporting function in a nuclear reactor vessel to withstand pressure up to 7,000 tonnes.The giant steel structure used to be forged by segmented welding assembly. However, the welding joints are vulnerable to high pressure, which poses safety concerns in nuclear power generation.Large seamless steel forging pieces are in high demand in China’s hydro-power, wind-power and nuclear-power generation industry.