Galvanized seamless tubes are produced by causing a reaction between molten metal and the iron substrate to form an alloy layer, thereby combining the substrate and the coating. Hot-dip galvanizing involves first pickling the steel pipe to remove iron oxide from the surface. After pickling, the pipe is cleaned in a bath of ammonium chloride or zinc chloride solution, or a mixture of both. It is then immersed in a hot-dip galvanizing bath. Hot-dip galvanizing offers advantages such as even coating, strong adhesion, and long service life. The steel pipe substrate undergoes complex physical and chemical reactions with the molten coating to form a tightly structured, corrosion-resistant zinc-iron alloy layer. This alloy layer merges with the pure zinc layer and the steel pipe substrate, enhancing its corrosion resistance.