... SO, PL, BL, THRD, LAP-JOINT, SW carbon steel ANSI flangeThe welding neck flange is normally referred to ... expensive because of the design.Threaded (Screwed) Flanges:The threaded flange is similar to the slip-on ... Free Forging, Mould Forging, Upset Forging.Main Material:Carbon Steel,ASTM A 105, ASTM A 350 LF1, ... 347, 347H, 347LN, 348, 348H, 904, 904L etc.Alloy Steel,ASTM A182 F1, F5a, F9, F11, F12, F22, ...