Socket welding flange socket welding flange is welded steel pipe flange at one end and the other end connected with bolts. Socket Welding Flange sealing surface forms: raised face (RF), convex surface (MFM), tongue and groove (TG), ring joint face (RJ) Manufacturing standards: ANSI B16.5, HG20619-1997, GB / T9117.1- 2000-GB / T9117.4-200, HG20597-1997 connection: flange nuts, bolts connecting the production process: Professional overall forging, forging manufacturing, processing methods: high-precision CNC lathe turning, fine turning lathe, welding and other processing applications: boiler and pressure vessel, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, food and other industries stamping elbow