Flange is an industry often used in the field of fasteners, has extremely extensive application in various industries. As in recent years, with the increase of voltage level to double circuit transmission line tower, the four circuits and so on large-scale development. The traditional Angle steel tower already cannot satisfy the requirement of circuit design. In contrast, steel pipe tower is famous for its big stiffness, clear, and the advantages of small wind power transmission path, has been more and more widely used in the line iron tower.
