The square pipe material is generally carbon steel square pipe and low alloy square pipe material. Most square pipes are made of steel tubes, which form round pipes through unpacking, flattening, crimping and welding processes, round pipes are rolled into square pipes, and then cut into the required length, square pipes are divided into decorative square pipes, mechanical square pipes and architectural square pipes, square pipes are used in construction, machinery manufacturing, steel structure and other engineering use, the performance of different environmental use of square pipes will be different, Pay attention to differentiation when buying.