Galvanized steel pipe EMT is divided into cold galvanized steel pipe, hot-dip galvanized steel pipe, cold galvanized steel pipe has been banned, and the difference between pig iron pipe JDG is as follows:
1. The hot-dip galvanizing pipe reacts the molten metal with the iron matrix to produce an alloy layer, thereby combining the matrix and the plating layer. Hot-dip galvanizing is performed by first pickling the steel pipe. In order to remove the iron oxide on the surface of the steel pipe, after pickling, cleaning is performed by an aqueous solution of ammonium chloride or zinc chloride or an aqueous solution of ammonium chloride and zinc chloride, followed by feeding. Hot dip plating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. The galvanized steel pipe substrate and the molten plating solution undergo complex physical and chemical reactions to form a corrosion-resistant and compact zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base body. Therefore, its corrosion resistance is strong.
2, cold galvanized pipe is electroplated zinc, galvanizing is very small, only 10-50g/m2, its own corrosion resistance is much worse than hot galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, mostly do not use electroplating zinc (cold plating). Only those small businesses with small scale and outdated equipment adopt electro-galvanizing, and of course their prices are relatively cheap. The Ministry of Construction has formally announced that cold galvanized pipes that are outdated in technology are not allowed to use cold galvanized pipes as water and gas pipes. Cold galvanized steel pipe galvanized layer is a plating layer, and the zinc layer and the steel pipe substrate are layered independently. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe substrate and it is easy to fall off. Therefore, its poor corrosion resistance. In new residential buildings, the use of cold galvanized steel pipes as water supply pipes is prohibited.
3, JDG steel pipe is to replace the PVC pipe and SC pipe and other traditional wire and cable replacement products, is the use of new materials, new breakthroughs in the field of construction electrical innovation. JDG steel pipe uses galvanized steel pipe and thin-walled steel pipe to cross the grounding line, which overcomes the disadvantages of common metal conduit construction complexity and large construction loss, and also solves the problems of poor fire resistance and difficult grounding of PVC pipe. As the cost of JDG steel pipe increases compared with ordinary pipe, it is mostly used for construction such as integrated wiring and fire-fighting wiring.
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