Galvanized steel pipes are divided into cold galvanized steel pipes and hot galvanized steel pipes. Cold galvanized steel pipes have been banned, and the latter has been advocated by the state to be used temporarily. In the 1960s and 1970s, developed countries in the world began to develop new pipes and gradually banned galvanized pipes. China Ministry of Construction and other four ministries and commissions have also issued a document stating that galvanized pipes have been banned as water supply pipes since 2000. Galvanized pipes are rarely used for cold water pipes in new residential areas, and galvanized pipes are used for hot water pipes in some residential areas. Hot-dip galvanized steel pipes are widely used in fire fighting, electric power and highways.