Division I sold to Hebei, Tianjin, Beijing, thin-walled galvanized pipe, greenhouses, hot galvanized steel pipe. Galvanized pipe specification is complete, multi-brand, as YHI galvanized pipe, Lida hot galvanized pipe, Dongsheng galvanized pipe. Step of hot dip galvanized steel: galvanized first steel pipe for pickling, in order to remove the iron oxide of the steel pipe surface after pickling, through an aqueous solution or ammonium chloride, ammonium chloride or zinc chloride and zinc chloride, a mixed aqueous solution tank cleaning, and then fed to the hot-dip plating bath. Hot galvanized coating uniformity, strong adhesion, long service life. Regular galvanized pipe manufacturers, in order to ensure the quality, they use a method of hot-dip galvanizing. The melt the plating bath of hot dip galvanized steel substrate complex physical, chemical reaction occurs to form a corrosion-resistant the structure closely zinc ferroalloy layer. Alloy layer of pure zinc layer, integrated steel matrix. Due to their corrosion resistance. The hot dip galvanized pipe for the molten metal and iron base reaction generating alloy layer, so that the substrate and coating combination of both. The galvanized pipe National Institute of Standards and size standard: GB/T3091-2008 low pressure fluid transfer welded steel pipe the GB/T13793-2008 straight seam welding steel pipe GB/T21835-2008 welded steel pipe dimensions and unit length weight