... .Certification:ISO9001:2008,TUV 2010, PED20 Weld Neck Carbon Steel Flange:1.Type:Carbon Steel Flange2.Material:Carbon steel3.Certification:ISO9001 ... ,TYPE02,TYPE05, TYPE11,TYPE12,TYPE13GBGB9112~9125-88 GB/T13402-92GOSTGOST 12820-80 12821-80SpecificationClass150#,300#,400#,600#,900#,1500#,2500#,PN0.25 ... 5. Heat Treatment 6.Cutting7. Inspection Weld Neck Carbon Steel Flange