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Classification Characteristics Of Hot Dipped Galvanized Steel Pipe

TF Sources Co.,Limited | Updated: Sep 19, 2018

Galvanized steel pipe, galvanized pipe, hot galvanized pipe, the former has been banned, the latter is also advocated by the State to use.

Hot Dip Galvanized Pipe Hot-Dip galvanized pipe is to make molten metal reacts with iron base to produce alloy layer, so that the matrix and the coating are combined. Hot-Dip Galvanized steel pipe is first pickling, in order to remove the iron oxide on the surface of the steel tube, after pickling, through the ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution trough cleaning, and then fed into the hot dip bath. Hot Dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. A complex physical and chemical reaction is formed between a steel tube substrate and a molten bath to form a zinc-iron alloy layer with a strong corrosion-resistant structure. The alloy layer is integrated with the pure zinc layer and the steel tube matrix.

Therefore, it has strong corrosion resistance ability.

1, the uniformity of the galvanized layer: steel tube specimens in copper sulfate solution continuous impregnation 5 times must not turn red (copper color)

2, Surface quality: Galvanized steel pipe surface should be a complete galvanized layer, no plating on the dark spots and bubbles exist, allow a small rough surface and local zinc tumor presence.

3, Galvanized layer Weight: According to demand-side requirements, galvanized steel pipe can be used for the determination of zinc layer weight, the average should not be less than 500g/square meters, any specimen shall not be less than 480g/square meters.

Cold Galvanized Pipe Cold galvanized is galvanized, zinc plating is very small, only 10-50g/m2, its own corrosion resistance of the specific heat galvanized pipe is a lot of difference. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use galvanized (cold plating). Only small, old-fashioned businesses use galvanized, and of course their prices are relatively inexpensive. At present, the Ministry of Construction has been formally below, the elimination of technology behind the cold galvanized pipe, the future is not allowed to use cold galvanized pipe for water, gas pipe. Zinc layer is electroplated layer, the zinc layer and the steel tube substrate independent stratification. The zinc layer is thinner, the zinc layer is simply attached to the steel tube substrate, easy to fall off. Therefore, the corrosion resistance of the performance is poor. In the new housing, cold galvanized steel pipe is forbidden to be used as water pipe.

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