Forged Carbon Steel Flange: Welding Neck, Slip-on, Blind, Plate ANSI B16.5, BS4504, DIN2633, ISO 7005-1 ISO TUV Certificate Forged WN Carbon Steel Flange:Welding Neck Flanges ... , Slip-on Flanges, Blind , Plate Flanges, Socket Weld Flanges,Threaded ... ,PN16,PN25,PN40,PN50,PN110,PN150, PN260,PN420 Forged Carbon Steel Flange