Rectangular tube is a  kind of hollow steel, also known as flat tubes, flat square tube or square flat tube .

 A large number of pipelines used for transporting fluids , such as oil, natural gas , water, gas , steam , etc.

 In addition , with bending and torsional strength , lighter weight , so it is widely used in the manufacture of mechanical parts and engineering structures .

Rectangular tube is used for Construction, machinery manufacturing, steel construction projects, shipbuilding , solar bracket , steel engineering, electrical engineering , power plants, agricultural and chemical machinery , glass walls, car chassis , airports and so on.

1 . Executable GB6728-2002 cold-formed structural hollow sections standards.

2 . Executable JISG3466-88 Japanese general construction Rectangular Pipe adapt the scope of the standard .