... JIS GS ASME DIN GB Rectangular hollow section pipe 1.Technique: ERW, hot rolled, cold rolled, cold drawn, extrusion.2.Standard: ASME, ... Eastern Asia.We are a professional manufacurer in steel pipe line for many years. Our factory is located ... ,Q390,ST52TechniqueERW,extrusion, hot rolled, cold rolled, cold drawnSurface TreatmentPainting, Coating, Galvanizing,PackagePipe cap, Steel strips bundled, or PVC ...