Rectangular tube is a hollow long steel material, also known as flat tube, flat square tube or square flat tube (as the name suggests). When the bending and torsional strength are the same, the weight is relatively light, so it is widely used in the manufacturing of mechanical parts and engineering structures. Rectangular tube is a hollow square cross-section lightweight thin-walled steel tube, also known as steel refrigerated profile. It is a square cross-sectional shape and size made of Q235 hot-rolled or cold-rolled strip or coil as the base material, and then made of cold bending and molding, and then high-frequency welding. Except for the thickening of the wall thickness of the hot-rolled extra-thick wall square tube, its corner size and edge straightness both reach or even exceed the level of resistance welding cold-formed square tube. Classification of rectangular pipes: Steel pipes are divided into Seamless Steel Pipes and welded steel pipes (slit tubes), hot-rolled seamless Square Pipes, cold-drawn seamless square pipes, extruded seamless square pipes, and welded square pipes. Among them, welded square pipes are divided into: 1. According to the process, arc welding square pipes, resistance welding square pipes (high frequency, low frequency), gas welding square pipes, and furnace welding square pipes; 2. According to the welds, straight sea welding square pipes and spiral welding square pipes. Construction, machinery manufacturing, steel construction projects, shipbuilding, solar power stents, steel structure engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.
