ductile iron k9 tube OD:6-1000mm WT:1-1200mm Series:200/300/400 Seamless.welded,hot rolled,cold drawn,ERW ductile iron k9 ... , construction and decorations, railroad vehicles.Some seamless stainless steel pipe/tube which has excellent corrosion resistant, mechanical properties are suitable to ... is supplied with shipment, Third Part Inspection is acceptable. ductile iron k9 tube