China’s Shandong Iraeta Heavy Industry Co. recently rolled off a huge seamless stainless steel forged ring, which it claims is the world’s largest. The ring, which weighs 150 tons and measures 51 feet (15.6 meters) in diameter, was manufactured as the key part of a nuclear power unit. 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 of up to 7,000 tons. The giant steel structure was produced by welding segmented sections into an assembly.