Galvanized steel pipes are divided into cold-galvanized steel pipes and hot-dip galvanized steel pipes, and cold-galvanized steel pipes have been banned. The latter has also been promoted by the state for temporary use. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and banned galvanized pipes. The Ministry of Construction and other four ministries also issued a document clarifying that galvanized pipes should be banned as water supply pipes from 2000. The chilled pipes in newly built communities have rarely used galvanized pipes, and some districts use galvanized pipes for hot water pipes. Hot-dip galvanized steel pipes are widely used in fire protection, electric power and highways.