... ProductQ235 SPIRAL STEEL PIPES USED FOR DREDGING PROJECTSpecificationSection shape: roundThickness: 4mm-16mmOuter diameter: 219mm-2020mmStandardASTM A252,Website: ... , steel stamp, drilling, diameter reducing pipe etc.Surface Treatment1.3PE2.PVC, black and color painting3.Transparent oil, anti-rust oil4.According ...