The difference between galvanized pipe and seamless pipe
Seamless steel pipes have hollow sections and are used in large quantities as pipes for transporting fluids, such as pipes for transporting petroleum, natural gas, gas, water and certain solid materials. Hot-dip galvanized seamless steel pipes have a small amount of galvanizing compared with galvanized pipes, so they are easily corroded and easily fall off. What is the difference between galvanized pipe and seamless pipe?
Hot dip galvanized steel:
The molten metal is reacted with an iron matrix to produce an alloy layer, thereby combining the matrix and the plating. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. galvanized steel pipe has the advantages of uniform plating, strong adhesion and long service life. The complex physical and chemical anti-galvanized steel pipe of the hot-dip galvanized steel pipe base and the molten plating solution shall form a zinc-iron alloy layer with a corrosion-resistant structure. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.
Hot-dip galvanized seamless steel pipe:
The amount of galvanizing is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipe. Regular galvanized pipe manufacturers use quenched galvanized pipes as water and gas pipes. The galvanized layer of the cold-galvanized steel pipe is an electroplated layer, and the zinc layer and the steel pipe base are separately layered. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe base and is easy to fall off. Therefore, its corrosion resistance is poor. In new homes, the use of cold-galvanized steel pipes as water supply pipes is prohibited.