... Malleable Iron 1.ISO,SGS 2.1/8"-6" 3.Connection:NPT threads 5.Standard,Heavy series Elbow 90 ... degree 3/8 inch, NPT, Galvanized Malleable Iron Shijiazhuang Jizhong ... American StandardMaterials: ANSI/ASME/A197-79Dimensions: ANSI/ASME B16.3-85Threads: ANSI/ASME B1.20.1Mechanical properties:Tensile Strength≥33kg ... ~2.9 %Si:1.2~1.7 %Mn:0.3~0.55 %P:0.12 %S:0.1 %