Steel Pipe, Steel Tube, Welded Steel Pipe manufacturer / supplier in China, offering ASTM A500 Hollow Structural Steel Tube 100X100X3mm Square Tube A36 Ms Tube Price, Grooved Pipe ASTM A795 Sch10 A53 Sch40 Sprinkler Pipe for Fire Fighting Protection System, En39 Scaffold Tube 48.3 3.2mm Galvanized Tube for Scaffolding Building and so on.