Hot Dip Galvanized Steel Pipe 1) W.T.:1.2-16mm 2) O.D.: 21. ... ,STK400,STK490,STK500,STK540InspectionWith Hydraulic Testing, Eddy Current , Infrared TestTechnique:Welded:Cold drawn,Hot rolled,heat extrusionPackingIn bundles or according to ... quantity of order:20MT4)Delivery period :15 to 30 Days High Quality Galvanized steel pipe/tube