... Specifications 1)welding neck , slip - on ,socket welding , blind. 2)ASTM A105,DIN ST37.2,ASTM A182-F304 F304L 3)ANSI B16.5 ... ,BA105,DIN ST37.2, ASTM A182- F304 F304L, F316,F316L,F321 ,ASTM A350 ,ASTM A181, Q235, 20#, 20Mn3)Rating : ANSI ... , JG, BS.7)All the flanges are according to the ASTM, BS, DIN, JIS, EN, GB and customer's request. socket welding stainless ...