前言 H型钢是平行腿的工字钢。因为它有良好的力学性能,用在建筑上可使构件重量减轻30％用在桥梁上可减轻重量15％,并且便于机械加工和安装。所以现在许多国家都用H型钢代替了腿内侧有斜度的工字钢。六十年代以后,轧制H型钢的万能轧机在世界各国得到迅速发展。现在世界上约有14个国家拥有53套以上H型钢轧机, H-beam is a parallel leg I-beam. Because of its good mechanical properties, it can be used in construction to reduce the weight of components by 30% on bridges to reduce the weight by 15% and to facilitate machining and installation. So now many countries have used H-beam instead of the slope of the inner side of the leg I-beam. Since the 1960s, the universal mill for rolling H-beam has been rapidly developed in various countries in the world. Now about 14 countries in the world have more than 53 sets of H-beam mills,