Galvanized steel pipe EMT is divided into cold galvanized steel pipe, hot galvanized steel pipe, cold galvanized steel pipe has been banned, and cast iron pipe JDG difference is as follows:
1 、 hot galvanized pipe is to make molten metal and iron matrix reaction and produce alloy layer, so that the substrate and coating two combination. Hot dip galvanizing is the first steel pickling, in order to remove iron, steel pipe surface after pickling, cleaning by ammonium chloride or zinc chloride solution or ammonium chloride and zinc chloride aqueous solution tank, and then into the hot dip tank. Hot galvanizing has the advantages of uniform coating, strong adhesion, long service life and so on. The chemical and chemical reactions between the substrate and the molten bath of the hot galvanized steel pipe are complicated and the corrosion resistant structure is closely alloyed with zinc and iron alloy. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, it has strong corrosion resistance.
2, cold galvanized pipe is galvanized, galvanized very little, only 10 - 50g/m2, its own corrosion resistance, galvanized pipe is quite different. Regular galvanized pipe manufacturer, in order to ensure quality, most do not use electro galvanized (Leng Du). Only small enterprises with small equipment and old equipment use zinc plating, of course, their prices are relatively cheaper. The Ministry of construction has formally eliminated the backward cold galvanized pipe, and shall not use cold galvanized pipes as water and gas pipes. The galvanized layer of the cold galvanized steel pipe is an electroplated layer, and the zinc layer and the steel pipe substrate are independently layered. The zinc layer is thin, and the zinc layer is simply adhered to the steel pipe matrix and is easy to fall off. Therefore, its poor corrosion resistance. Cold galvanized steel pipes are not allowed to be used as water supply pipes in new houses.
3, JDG steel pipe is to replace PVC pipe and SC pipe and other types of traditional wire duct replacement products, is the construction of electrical field using new materials, new technology of a breakthrough innovation. JDG steel pipe is made up of galvanized steel pipe and cross connect ground wire of thin wall steel tube. It overcomes the defects of complicated construction and large construction loss of common metal pipe. At the same time, it also solves the problems of poor fire resistance and difficult grounding of PVC pipe. Because the JDG steel pipe material is more expensive than the ordinary pipe material, it is more used in the construction, such as comprehensive wiring, fire protection wiring and so on.
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