... :Carbon steel 3.Certification:ISO9001:2008,TUV 2010, PED20 Weld Neck Carbon Steel Flange:1.Type:Carbon Steel Flange2.Material:Carbon steel3.Certification ... inch(DN15 to DN 6000) or as per customers requirement.Face typeFF, RF, LJ, RTJ, TG,T,GCertificateISO9001:2000, TUV ,PEDInspectionin ... 3. Heating 4. Forging 5. Heat Treatment 6.Cutting7. Inspection Weld Neck Carbon Steel Flange