... Steel Flange long neck flange(1) Flanges Type: Plate Flange, Flat Flange, Slip on Flange, Welding Neck Flange, Long Welding Neck Flange, Blind Flange, Socket Welding Flange, Thread Flange, Screwed Flange ... F304/304L, F316/316L, F316H, F310, F321 F44 (UNS S31254) Alloy Steel flanges ASTM A182 F1, F5a, F9, F11, F12, F22 ...