... site inspection report Hot dip galvanized scaffolding pipes/steel scaffolding tubes/scaffolding steel tubesO.DO.D toleranceW.TThickness Tolerance21.3-508mm ... /400/500,S235JR/S235JQ/S235J2,STK290,STK400,STK490,STK500,STK540InspectionWith Hydraulic Testing, Eddy Current , Infrared TestTechnique:Welded:Cold drawn,Hot ... of order:20MT4)Delivery period :15 to 30 Days High Quality Galvanized steel pipe/tube