Abstract This second edition cancels and replaces the first edition (1975). Specifies the technical conditions for tubes. Tabulates the chemical composition (table 2) and mechanical properties (tables 3 to 6) as well as dimensions (table 9) ranging from 4 mm up to and including 260 mm (outside diameter) and tests (tables 7 and 8). For use in hydraulic piping equipment they shall be used only in the annealed or normalized condition.