China seamless carbon steel butt weld pipe fittings supplierConnection methods:Socket weld pipe fittings threaded pipe fittings, flange pipe fittings, hutt weld pipe fittingMaterial: ASTM A105, ASTM A350 LF1, A350LF2, Q235B, 20#, 16Mn, Standard :ASMEANSI B16.9, ASMEANSI B16.11, ASMEANSI B16.28, ASME B16.5, MSS SP-43 , MSS SP-83, MSS SP-97 Pressure:Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS;Sch80, SCH100, Sch120, Sch140, Sch160, XXS .