Galvanized pipes, also known as galvanized steel pipes, are divided into hot-dip galvanizing and electro-galvanizing. The hot-dip galvanizing galvanized layer is thick, with uniform plating, strong adhesion and long service life. The cost of electroplating is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized steel pipe supplier.
Classification of galvanized steel pipes:
1.Cold galvanized steel pipe
Cold galvanizing is electrogalvanizing. 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, in order to ensure quality, most do not use electro-galvanizing (cold plating). Only small companies with small equipment and old equipment use electro-galvanized steel, of course, their prices are relatively cheaper. In the future, cold galvanized pipes should not be used as water and gas pipes.
The zinc layer is an electroplated layer, and the zinc layer and the steel pipe matrix are layered independently. 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.
2.Hot dip galvanized steel pipe
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. Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. Most of the northern processes use galvanized strips to directly coil the zinc.
The steel pipe matrix and the molten plating solution undergo complex physical and chemical reactions to form a corrosion-resistant structure of a zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.
Relevant utilization of galvanized steel pipes:
In order to improve the corrosion resistance of the steel pipe, the general steel pipe is galvanized. The galvanized steel pipe is divided into two types: hot-dip galvanizing and electro-galvanizing. The hot-dip galvanizing layer is thick, the cost of electro-galvanizing is low, and the surface is not very smooth. Blowing oxygen welded pipe: used as a steel pipe for oxygen blowing, generally using small diameter welded steel pipe, the specifications are from 8/8-2 inch. Made of steel strips of 08, 10, 15, 20 or 195-Q235, in order to prevent corrosion, some have to be effectively aluminized.
The main purpose of galvanized steel pipe:
The galvanized steel pipe is often used to transport gas and heating. The galvanized steel pipe is used as a water pipe. After a few years of use, a large amount of rust is generated inside the pipe seamless steel pipe supplier. The yellow water that flows out not only pollutes the sanitary ware, but also contains bacteria that grow on the unsmooth inner wall; the rust causes the heavy metal content in the water to be too high, which seriously endangers the health of the human body. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and banned galvanized steel pipe.