Galvanized pipe, also known as galvanized steel pipe, is divided into hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing has a thick galvanized layer, uniform coating, strong adhesion, and long service life. Electro-galvanizing has low cost, but the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipe.