Galvanized steel pipe, steel type, galvanized steel pipe is divided into cold-dip galvanized steel pipe and hot-dip galvanized steel pipe. Cold-dip galvanized steel pipe has been banned, and the latter is temporarily recommended by the state. In the 1960s and 1970s, developed countries in the world began to develop new pipes and banned galvanized pipes one after another. China's Ministry of Construction and other four ministries also issued a document to ban the use of galvanized pipes as water supply pipes from 2000. Galvanized pipes are rarely used for cold water pipes in newly built communities, and some communities use galvanized pipes for hot water pipes. Hot-dip galvanized steel pipes are widely used in fire protection, electricity and highways.