Square steel pipe is also known as square and rectangular cold bending hollow steel,referred to as square pipe and rectangular pipe. It is a kind of joint name of square pipe and rectangular pipe,that is,the steel pipe with equal and unequal side length,it is made of strip steel processed by technology.
Generally,strip steel after unpacked,flattened,crimped,welded round pipe,then rolled into square pipe, and then cut into the required length.