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 for temporary use. In the 1960s and 1970s, developed countries began to develop new types of pipes, and have banned galvanized pipes. China's Ministry of Construction and other four ministries and commissions also issued a document explicitly banning galvanized pipes as water supply pipes from 2000. Galvanized pipes are rarely used in cold water pipes of new residential areas, and some residential hot water pipes use galvanized pipes. Hot dip galvanized steel pipe has a wide range of applications in fire, electric power and highway.

The material of carbon steel plate is plain carbon steel or carbon steel, which is a steel with a carbon content of less than 2.11% and no metal elements intentionally added. In addition to carbon, it also contains a small amount of sulfur, silicon, phosphorus, manganese and other elements . Carbon steel plates can be divided into low carbon, medium carbon and high carbon according to the carbon content; according to the application, they can be divided into tools, structures, and free-cutting structural steel; according to the deoxidation method, they can be divided into boiling steel, semi-killed steel, killed steel, and special killed steel; According to the way of smelting, it can be divided into converter steel, open hearth furnace steel and electric furnace steel.