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<br /><br />The classification of galvanized steel pipe: cold galvanized pipe, hot galvanized pipe, the former has been disabled, the latter also being able to use state advocates.
Hot dip galvanized pipe
Hot dip galvanized pipe is to make molten metal and iron-based alloy layer body reaction, so that the matrix and coating a combination of both. Steel Pipe Manufacturing Co., Ltd. Liaocheng Jia-bin supply of galvanized pipe. Hot dip galvanized steel pipe is the first to pickling, in order to remove the steel pipe surface of iron oxide, pickling, adopted, or ammonium chloride, ammonium chloride or zinc chloride and zinc chloride mixed aqueous solution tank cleaning, and then send into the hot-dip tank. Hot-dip galvanizing with a coating uniformity, strong adhesion, long service life and so on. Hot dip galvanized steel substrate with the molten bath occurrence of a complex physical, chemical reaction, to form the structure of corrosion-resistant zinc-iron alloy layers close. Alloy layer and the pure zinc coating, steel matrix integration. Therefore, its corrosion resistance ability.
Cold galvanized pipe
Cold galvanized pipe that is galvanized, galvanized a very small number, only 10-50g/m2, its own corrosion resistance than hot dip galvanized pipe far too small. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanized (cold plate). Only those who are small, outdated equipment and small business use of electro-galvanized, of course, their prices are also relatively cheaper. At present the Ministry of Construction has formally below, eliminate backward technology of cold galvanized pipe, galvanized pipe in the future are not allowed to make cold water, gas pipes. Cold galvanized steel pipe galvanized layer is electroplated layer, zinc layer and steel substrate independent layer. Thin layer of zinc, zinc layer simply attached to the steel substrate, easily. Therefore, its poor corrosion resistance. In the new residential, the prohibition of the use of galvanized steel as a cold water pipe.
Galvanized steel pipe weight factor: Nominal thickness mm 2.0 2.5 2.8 3.2 3.5 3.8 4.0 4.5 Coefficient of parameters: c 1.064 1.051 1.045 1.040 1.036 1.034 1.032 1.028
Note mechanical properties of steel is to ensure that steel end-use properties (mechanical properties) is an important indicator, it depends on the steel chemical composition and heat treatment systems. In the steel standards, according to different usage requirements of the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as user requirements of high and low temperature properties. : Steel grades: Q215A; Q215B; Q235A; Q235.
Test pressure value / Mpa: D10.2-168.3mm for 3Mpa; D177.8-323.9mm for 5Mpa