... , ISO2531, ISO4179, ISO8179, ISO4633, ISO7186, EN545, EN598, BS4772 Standard. N II-type joint pipe for gas supplyMECHANICAL PROPERTIES: The mechanical properties of ... Pipes shall be as shown in the table: Type of CastMinimumTensile strengthMinimum Elongation Percent After fracture, AHardness Max.(HB ...