过去热带粗轧机的工作辊一直使用半钢轧辊，但随着轧辊耐磨性和耐粗糙性要求的提高，已改为使用性能更好的高铬铸钢轧辊。最近，由于对轧辊的要求越来越高，希望开发比高铬铸钢辊性能更好的轧馄。为了适应这样的要求，日本日立金属公司若松厂开发了用高速钢作为外层材质的工作 In the past, the work rolls of tropical roughing mills had been using semi-steel rolls, but with the increasing requirements of the roll’s wear resistance and roughening resistance, the use of better-performing high-chromium cast steel rolls has been changed. Recently, due to the increasing demand for rolls, it is hoped to develop rolls that perform better than high chromium cast rolls. In order to meet such a demand, Japan’s Hitachi Metals Company Wakamatsu Factory has developed a high-speed steel as the outer layer of material work