The Carbon square tube (Carbon Welded Square pipe ) is a hollow square cross-section light-weight thin-walled steel tube, also known as steel cold-formed profile. It is a steel pipe with a square cross-section shape and size made of  hot-rolled or cold-rolled strip or coil as the base material, which is formed by cold bending and then high-frequency welding.

Carbon Square tubes are used in construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar power generation brackets, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, boiler construction, highway railings, Housing construction, pressure vessels, oil storage tanks, bridges, power station equipment, lifting and transportation machinery and other high-load welded structural parts, etc.