Knowledge of
Steel Pipe introduction: galvanized seamless steel pipe galvanizing is very small, only 10-50g/m2, its own corrosion resistance is much worse than hot galvanized pipe. Regular galvanized pipe manufacturers use cold galvanized pipes as water and gas pipes. Cold galvanized steel pipe galvanized layer is a plating layer, and the zinc layer and the steel pipe substrate are layered independently. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe substrate and it is easy to fall off. Therefore, its poor corrosion resistance. In new residential buildings, the use of cold galvanized steel pipes as water supply pipes is prohibited.
After the API seamless steel pipe is pickled, it is washed in an aqueous solution of ammonium chloride or zinc chloride or an aqueous solution of ammonium chloride and zinc chloride. In order to ensure quality, most of electroplated steel (cold plating) is not used. Only those small businesses with small scale and outdated equipment use electro-galvanizing, and of course their prices are relatively cheap. At present, the Ministry of Construction has formally announced that the elimination of cold galvanized pipes with backward technology is not galvanized in the future. The molten metal is reacted with the iron matrix to produce an alloy layer so that both the matrix and the plating are combined. In hot dip galvanizing, the steel pipe is first pickled, and the iron oxide on the surface of the steel pipe is removed and then sent to a hot dip coating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
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