... hot dipped galvanized steel pipe OD:1/2"-18" WT:0.5mm-8.5mm Zinc coating: 300-480g/m2 hot dipped galvanized steel pipeWe have extrem experience in steel ... under the ISO9001:2000 strickly. About Us :TIANJIN FRIEND STEEL PIPE CO.,LTD is located in Tianjin Industrial Park, ... factory area is 6500 square meters. We produce welded pipes, galvanized pipes, spiral pipes, square pipes, . Our company's products ...