Galvanized steel pipe is the carbon steel pipe that are coated with a protective layer of zinc. The zinc layer served as a sacrificial layer, it will get rust before the carbon steel under neath it. Galvanized steel pipe is divided into cold galvanized steel pipe, hot dipped galvanized steel pipe. Galvanized layer will strengthen the anti-corrosion performances of steel pipe. 5.Galvanized steel pipe have long lifetime. But in different conditions the lifetime of use are different. Generally speaking, 13 years in heavy industrial district, 50 years for ocean environment, 104 years in suburbs, 30 years in city. In fact galvanizing have played a role of anti- rusty, it is no need other rust treatment. Product name: galvanized carbon steel pipe, hot dipped galvanized steel pipe, cold galvanized steel pipe; Standard: ASTM, ASME and API; Grades: ASTM A106 Gr. B/C, API 5L Gr. B, ASTM A53 Gr. B.API 5L Gr. X42/X46/X52/X56/X60/X65/X70/X80and higher. PSL-1/PSL-2; 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; 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.