Item name:Socket Welding Flange(welding flange,flanges factory ) Material:Carbon Steel ASTM A105, ASTM A350 LF1, LF2 CL1/ ... CL2, Item name:Socket Welding Flange(welding flange,flanges factory )Material:Carbon SteelASTM A105, ASTM A350 LF1, LF2 CL1/CL2 ... , F11, F12, F22, F91 Socket Welding Flange(welding flange,flanges factory )