Ningbo square tube supply, low-alloy square tube, Q345B square tube, Shanghai Iron Horse Industry Co., Ltd. is a low-alloy square tube lightweight thin-walled hollow square-section steel, also known as cold-formed steel profiles. It is based on the shape and size of the square cross-Q235 hot rolled or cold-rolled steel strip or coil base material for forming the cold bending back via high-frequency welding steel. 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. Good mechanical properties, weldability, cold, heat processing performance and corrosion resistance are good, with a good low-temperature toughness. Low-alloy square tube 100 * 100 * 4-10 low-alloy square tube 120 * 120 * 4-10 low-alloy square tube 140 * 140 * 4-12 low-alloy square tube 150 * 150 * 4-12 low-alloy square tube 160 * 160 * 4-12 low-alloy square tube 180 * 180 * 4-12 low-alloy square tube 200 * 200 * 4-16 low-alloy square tube 250 * 250 * 5-16 low-alloy square tube 300 * 300 * 5-16 Low alloy square tube 350 * 350 * 6-18 low-alloy square tube 400 * 400 * 8-20 low-alloy square tube 450 * 450 * 12-16 low-alloy square tube 500 * 500 * 16-20 low-alloy square tube 600 * 600 * 16-20