... STD, SCH40, SCH80, SCH160. XS,XXS and so on.StandardsANSI B16.9 / 16.28, ASTM A53/A106 ... A106,A53GRB,A53-A,A106-A,A192,A226,A315-B,A106-B,A178-C,A210-A-1,A210-C,A333 ... advance , the balance against with the copy of B/L) Equipment Quality Control: Our products :carbon steel ... SCH120, SCH140, SCH160, XXSFlangeType:welding neck flange, slip-on flange, blind flange,socket weld flange.lap-joint flange ...