Galvanized steel pipe

Hot dipped galvanized pipe

Hot dip galvanized pipe is the molten metal and iron substrate reaction and produce alloy layer, so that the substrate and coating combination of both. Is hot dip galvanized steel pipes to pickling, in order to remove iron oxide on the surface of the steel tube after acid cleaning, by ammonium chloride or zinc chloride or ammonium chloride and zinc chloride mixed aqueous solution tank cleaning, and then sent to the hot dip plating tank. Hot dip galvanized with uniform coating, strong adhesion, long service life, etc. Hot dip galvanized steel substrate with molten electrolyte solution in complex physical and chemical reaction, form a corrosion resistant structure compact zinc alloy layer. Pure zinc alloy layer and layer and steel substrate. So the corrosion resistant ability.

Cold galvanized pipe

Cold galvanized pipe is galvanized, galvanized quantity is little, only 10 to 50 g/m2, its corrosion resistance than galvanized pipe vary a lot. Normal galvanized pipe manufacturers, in order to guarantee the quality, most do not use electric galvanized (cold) plating. Only those small and old equipment of small businesses use electric galvanized, of course, their price is relatively cheaper. At present, the ministry of construction has officially below, eliminating backward technology of cold galvanized pipe, the future not be allowed to use cold galvanized pipe for water and gas pipe. Cold galvanized steel pipe is electric galvanized layer coating, zinc layer and steel substrate layered independently. The zinc layer is thinner, zinc layer attached on the steel substrate, simple easy to fall off. So the poor corrosion resistance. In the new residence, it is prohibited to use cold galvanization steel tube as a feed pipe.
If you would like to know more about carbon steel pipe,pls contact:hunan great steel pipe co.,ltd