Welded steel pipes with hot-dip or electroplated galvanized coating on the surface of galvanized steel pipes. Galvanization can increase the corrosion resistance of steel pipes and extend their service life. Galvanized pipes have a wide range of applications. In addition to being used as pipeline pipes for general low-pressure fluids such as water, gas, and oil, they are also used as oil well pipes and oil delivery pipes in the petroleum industry, especially in offshore oil fields. They are also used as oil heaters, condensate coolers, coal distillation and washing oil exchangers in chemical coking equipment, as well as support pipes for bridge piles and mining tunnels.