... ,GB,BS special design available size:10~6000mm carbon steel square flangeSTANDARDS:. ANSI B16.5/MSS.SP 44,JIS B2220,DIN ... flange, Socket Welding flange, Threaded flange, Lap Joint flange and Plate flange etc.Material:316L, 316Ti, 304L, 321, 321H, Rst37.2 ... to contact us, I'll reply you in 24 hours Square flange