Pre-galvanised Steel Pipe Hot-dipped Galvanized tube

Hot dip galvanizing is to make the molten metal and iron matrix reaction and produce alloy layer, so that the substrate and coating.Hot dip galvanizing begins with pickling of steel pipes.In order to remove the iron oxide on the surface of the steel pipe, after pickling, ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank cleaning, and then into the hot dip plating tank.Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

Galvanized pipes are welded steel pipes with a hot-dip galvanized or electro-galvanized layer on the surface. Galvanizing can increase the corrosion resistance of the steel pipe and prolong the service life. Galvanized pipes have a wide range of uses. In addition to line pipes for conveying water, gas, oil and other general low-pressure fluids, they are also used as oil well pipes and oil pipes in the petroleum industry, especially offshore oilfields, as well as oil heaters and condensate for chemical coking equipment. Pipes for coolers, coal-distilled wash oil exchangers, pipe piles for trestle bridges, and pipe for support frames in mine tunnels, etc.

Mechanical properties, which depend on the chemical composition and heat treatment system of steel, are important indicators to ensure the final service properties (mechanical properties) of steel.In the steel pipe standard, according to different use requirements, stipulate the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as user requirements of high and low temperature performance.Uniformity test, cold bending test, hydrostatic test or eddy current test of zinc coating as required before delivery.