... , Alloy Steel 5:Marking as Customer design. Carbon Steel Swivel Ring Flange Type Weld Neck,Slip-On,Blind,Socket Weld,Lap Joint ... BLIND FLANGE, SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE JOINT FLANGE.Pressure Class : 150, 300, 400 , 600 , 900, 1500 ... , 2500* ASME/ANSI B16.47(SERIES A & B) : WELDING NECK FLANGE, BLIND FLANGE. Pressure Class : 75, 150 ...