... ;BS;DIN;ISO ProductBland Flange ,Steel flange,Carbon steelSize15mm~600mmMaterialCarbon steel(20#,35#,45# etc),Stainless steel,Alloy steel,etcTypeblank flange(blind flange)Pressure150lb ... surface of flat welding flange FF, RF2. Flange productive material:Stainess Steel: 201,202,301,304,304L,316,316L