Hot-Dip galvanized steel pipe is hot-dip galvanizing process, steel pipe inside and outside the wall have zinc layer.
Hot-dip Galvanized steel pipe use: Mainly used for conveying gas, heating.
In gas, large shed, heating the kind of iron pipe is galvanized pipe, galvanized pipe as a pipe, the pipe produced a large number of rust, the outflow of yellow water not only pollute the sanitary ware, Hot-dipped Galvanzied Steel Pipe but also mixed with a smooth wall breeding bacteria, rust caused by heavy metal content in water, serious harm to the health of the human body. In the 670 's, Hot-dipped Galvanzied Steel Pipe the developed countries began to develop new tubes and galvanized tubes. China's Ministry of Construction and other four ministries also issued a clear ban on galvanized pipe from 2000, the current new residential area of the cold water pipe has been very little use of galvanized pipe, some residential hot water pipes are galvanized pipe.
Hot-Dip Galvanized steel pipe: In order to improve the corrosion resistance of steel pipe, Hot-dipped Galvanzied Steel Pipe the general steel pipe galvanized. Galvanized steel Pipe Hot-dip galvanized and galvanized two, hot-dip galvanized coating thickness, zinc plating costs low, the surface is not very smooth.
Hot-Dip Galvanized steel pipe is the reaction of molten metal and iron-based body to produce alloy layer, so that the matrix and the coating are combined together. Hot Dip Galvanizing is the first steel pipe pickling, in order to remove iron oxide on the surface of steel pipe, after pickling, Hot-dipped Galvanzied Steel Pipe through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed water solution tank in the cleaning, and then into the hot dip bath. Hot-Dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. The complex physical and chemical reaction of the steel tube substrate and the molten plating solution forms the corrosion-resistant structure of the zinc-iron alloy layer. Hot-dipped Galvanzied Steel Pipe The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. So its corrosion resistance is strong.
1, the uniformity of galvanized layer: steel tube specimens in copper sulfate solution continuous impregnation 5 times shall not become red (copper color)
2. Surface quality: Galvanized steel pipe should have a complete galvanized layer, Hot-dipped Galvanzied Steel Pipe no plating on the black spots and bubbles exist, allowing a small rough surface and the presence of local zinc tumors.
3, Galvanized layer Weight: According to demand, galvanized steel pipe can be used for the determination of the weight of zinc, Hot-dipped Galvanzied Steel Pipe the average value should not be less than pckage square meters, of which any sample shall not be less than 480g/square meters.