Large Diameter Spiral Welded Steel Pipe1,Website:http://www.sinosteelpipes.com,Specification: ... . Outsize: Φ2020-3500mm; Thickness: 6~28mm. 2, Special Characteristic: Max Diameter: 3500mmMax Thickness: 28mm3,Main Manufacturer Process: Uncoiling - Rolling - leveling - butt ... : As one of the biggest manufactures of China, we exported large quantity to American, Europe, Asia and Africa countries, due to ...