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Precision tube. Scaffolding tube. Guardrail tube

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. Classification of galvanized pipes
. Galvanized steel pipes are divided into cold-plated pipes and hot-dip pipes. The former has been banned, and the latter has been promoted by the country to be temporarily available
. Hot-dip galvanized pipe
. The molten metal reacts with the iron matrix to produce an alloy layer, thereby combining the matrix and the coating. Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned in an aqueous solution of ammonium chloride or zinc chloride or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to in a hot dip plating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life.
. Cold galvanized pipe
. Cold galvanizing is electro-galvanizing. The amount of galvanizing is very small, only -/. Its corrosion resistance is better than that of hot-dip galvanizing. Zinc pipes are very different. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanizing (cold plating). Only small businesses with small scale and old equipment use electro-galvanizing, and of course their prices are relatively cheaper. At present, the Ministry of Construction has officially issued a notice to eliminate cold-galvanized pipes with backward technology. In the future, cold-galvanized pipes are not allowed to be used as water and gas pipes.
. Hot-dip galvanized steel pipe
. The steel pipe matrix undergoes complex physical and chemical reactions with the molten plating bath to form a corrosion-resistant zinc-iron alloy layer with a tight structure . The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, it has strong corrosion resistance.
. Cold-dip galvanized steel pipe
. The zinc layer is an electroplated layer, and the zinc layer is layered independently from the steel pipe matrix. The zinc layer is thin, and the zinc layer simply adheres to the steel pipe matrix and falls off easily. Therefore, its corrosion resistance is poor. In new residential buildings, it is prohibited to use cold-dip galvanized steel pipes as water supply pipes.
, .

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Precision tube. Scaffolding tube. Guardrail tube

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