Zhejiang hot rolled square tube, low-alloy square tube, square tube spot size, Shanghai Hao iron square tube is a thin-walled hollow square cross-section of the light pipe, also known as cold-formed steel profiles. It is based on the shape and size of the square cross section steel hot-rolled or cold-rolled strip or coil is blank after the cold bending molding made by high-frequency welding. In addition to the hot-rolled special thick-walled square tube wall thickness thickened outer case, the corners of the size and edge flatness meet or exceed the resistance welding cold forming square tube level. Most of the pipe to steel mainly used for machinery and equipment, building square tube, decorative tube, corridor railings. Low-alloy square tube 180-180 (5.0-12) low-alloy square tube 150-150 (3.0-10) low-alloy square tube 140-140 (3.75-10) low-alloy square tube 100-100 (2.0 to 10) low-alloy RHS 130-130 (3.0-8.0) low-alloy square tube 120-120 (3.0-8.0) low-alloy square tube 200-200 (4.0-14.0) low-alloy square tube 250-250 (5.0-16.0) low-alloy square tube 300-300 (6.0-16) low-alloy square tube 450-450 (8.0-16) low-alloy square tube 350-350 (6.0-16.0) low-alloy square tube 400-400 (8.0-16.0)