spiral steel pipe (1) Outside Diameter: 219 mm to ... Thickness: 6 to 18mm ( 0.236-0.708 inch) Spiral Steel Pipe(1) Outside Diameter: 219 mm to 2220mm (8 ... X42, X46, X52, X56, X60, X65, J55, (4)Type of Spiral Steel Pipe coating: 2PE, 3PE, Epoxy powder. (5) Application: structure ... Spiral Steel Pipe, piling pipe. Sewage and clear water transpotation. ...