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What national standards are implemented for hot-dip galvanized steel pipes

Release date:2018-06-28 author: click:

Current national standard for galvanized steel pipes:

GB/T3091-2008

GB/T13793-2008


GB/T21835-2008


Galvanized steel pipe production process standards:

The molten metal is reacted with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. 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 washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. The complex physical and chemical anti-galvanized steel pipe of the hot-dip galvanized steel pipe base and the molten plating solution shall form a zinc-iron alloy layer with a corrosion-resistant structure. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.