carbon steel reducing pipe flange 1.We have our own factory 2.Size: ... ;BS;DIN;ISO ProductFlange ,Steel flange,Carbon steel,carbon steel reducing pipe flangeSize15mm~600mmMaterialCarbon steel(20#,35#,45# etc),Stainless steel ... different materialsCould be combined with other items in one order.Reducing pipe flange is widely used in water conservancy, electricity, power ...