... ''-24'' thickness: SCH20, STD, SCH40, XS, SCH80, XXS (for ANSI) carbon steel pipe fittings1) Carbon steel fitting, alloy steel tee, stainless steel ... : SGP, DIN, GOST, STD, SCH20,SCH40, SCH80, SCH160 etc.4) Standard: ANSI B16.9 / 16.28, ASTM A53/A106, API 5L, ASME ... process are made according to ISO9001:2008 asme B16.5 pipe fittings