Hot dip galvanized steel pipe

Hot dip galvanized pipe is the reaction of molten metal with iron matrix to produce alloy layer, so that the matrix and the coating are combined. Hot dip galvanizing is to first pickling the steel pipe, in order to remove the iron oxide on the surface of the steel pipe, after pickling, through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank for cleaning, and then into the hot dip plating tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complex physical and chemical reactions occur between the steel tube substrate and the molten bath to form a tight zinc-iron alloy layer with corrosion resistance. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, its corrosion resistance is strong.

1, the uniformity of the galvanized layer: the steel pipe sample in the copper sulfate solution continuous impregnation 5 times shall not turn red (copper plating color)

2, surface quality: the surface of galvanized steel pipe should have a complete galvanized layer, no unplated black spots and bubbles exist, allowing a small rough surface and local zinc tumor.

use

Widely used in fire water supply, gas, air, oil, heating steam and other low pressure fluid transport and mechanical structure.

Product standard

GB/T3091-2015 standard

GB/T3091-2015 standard for water, sewage, gas, air, heating steam and other low-pressure fluid transport and some other structures with straight welded pipes.