Galvanized square steel pipe is a kind of hollow square section steel pipe with square section shape and size made of hot rolled or cold rolled galvanized strip steel or galvanized coil steel after cold bending and forming, and then high-frequency welding, or galvanized square steel pipe made in advance of cold bent hollow steel pipe and then processed by Hot-dip galvanization.Galvanized square pipes are divided into hot dip galvanized square pipes and cold dip galvanized square pipes in terms of production technology. It is precisely because the processing of these two types of galvanized square pipes is different that they have many different physical and chemical properties.