Socket welding flange is welded steel pipe flange at one end and the other end connected with bolts. Sealing surface forms: raised face (RF), convex surface (MFM), tongue and groove (TG), ring joint face (RJ) Material: Carbon Steel (Carbon Steel): ASTM A105,20 #, Q235,16Mn, ASTM A350 LF1, LF2, CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70; stainless steel (Stainess Steel): ASTM A182 F304,304L, F316,316L, 1Cr18Ni9Ti , 0Cr18Ni9Ti, 321,18-8; alloy (Alloy Steel): ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11,16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45. 8 / Ⅲ; manufacturing standards: ANSI B16.5, HG20619-1997, GB / T9117.1-2000-GB / T9117.4-200, HG20597-1997 connection: flange nut, bolt connection. Production process: Professional overall forging, forging manufacturing. Processing methods: high-precision CNC lathe turning, fine turning lathe, welding and other processing. Applications: boilers, pressure vessels, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, food and other industries stamping elbow.