Square pipe, as its name implies, is a kind of square pipe. Many kinds of material can form square pipe. It is used for what purpose and where. Most square pipe is made of steel pipe. After unpacking, flattening, crimping and welding, it forms round pipe. Then it is rolled into square pipe and cut into needed pipe. Length. Generally, 50 square pipes per package are in large specifications at most 10*10*0.8-1.5-500*500*10-25 in spot. Square pipes are divided into structural square pipes, decorative square pipes, construction square pipes, mechanical square pipes and so on.