Galvanized steel pipes are divided into cold- galvanized steel pipes and hot- dip galvanized steel pipes , so they are the same kind of steel, but the galvanized layer is different. The galvanized steel pipe has a welded steel pipe with a hot-dip galvanized or electro-galvanized layer on the surface. Galvanizing can increase the corrosion resistance of the steel pipe and prolong the service life. Cold- galvanized steel pipes have been banned, and the latter is also advocated by the state to be used temporarily. Specifically, you can look at the difference between this hot- dip galvanized steel pipe and cold- galvanized steel pipe