The molten metal reacts with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot dip galvanized steel pipe is first pickling, in order to remove 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 steel pipe has the advantages of uniform coating, strong adhesion and long service life. Most of the processes in north China are zinc plating with direct coil pipe.

Material Standard: ASTM, ASME and API 5L PSL2;
Size: 1/2 inch to 12 inch, 14 inch, 16 inch, 18 inch, 20 inch, and 24 inch for seamless;
Wall thickness: SCH 10, SCH 20, SCH 30, SCH 40, STD, XS, SCH 60, SCH 80, SCH 100, SCH120, SCH160, XXS;
Length Range: 20 FT (6 meter), 40FT (12 meter)or customized;
Form: Round, Square, Rectangular Etc
Ends Type: Beveled ends, Plain ends;
End Protection: plastic Caps or iron Caps;
Surface Coatings: Natural, Varnished, Black painting, 3PP, FBE and 3PE, Cladding and Lined etc.