... GS ASME DIN GB Rectangular hollow section pipe 1.Technique: ERW, hot rolled, cold rolled, cold drawn, extrusion.2.Standard: ... widely used in many industries. NameRectangular hollow section pipe Size400*400-1420*1420mmThickness2-60mmLength4000mm-12000mmPipe ... 45#,Q345,16mn,Q390,ST52TechniqueERW,extrusion, hot rolled, cold rolled, cold drawnSurface TreatmentPainting, Coating, Galvanizing,PackagePipe cap, ...