... and with the most competitive price. --Welded Square Steel Pipe/Welded Square Steel Tube-- Material of Welded Square Pipe: 1) Q195, Q215, Q235 ... T of Welded Square Pipe: 0.6mm~25m Section Shape: Suqare Product Type: Square tubes, ERW tubes, Welded steel pipe, Galvanized steel pipe etc ... of other non-round steel tube, it has light weight, high intensity, big anti-curved section modulus, saving metal, ...