... #, 600#, 900#, 1500#, 2500#SpecificationStainless Steel ASTM A182 F304/304L/316/316LAlloy Steel ASTM A182 F1/F5/F9/F11/F22 ... /F91/etc.Duplex stainless steel ASTM A182 F51/F53/F55/F60Nicke alloys Nickel 200 ... 625, Incoloy 825/800Cu-Ni 90/10, 70/30Forged Steel Flanges:* ASME/ANSI B16.5: WELDING NECK FLANGE, ... , 5000Psi, 10000Psi, 15000Psi, 20000Psi, 25000Psi API Flange 316 Carbon Steel