NBN EN 515 : 1993

Foreword
1 Scope
2 Definitions
2.1 Cold-working
2.2 Strain-hardening
2.3 Solution heat-treating
2.4 Ageing
2.5 Annealing
3 Basis of codification
4 Basic temper designations
4.1 F - As fabricated
4.2 O - Annealed
4.3 H - Strain-hardened
4.4 W - Solution heat-treated
4.5 T - Thermally treated to produce stable tempers
       other than F, O or H
5 Subdivisions of O (annealed) temper designations
5.1 O1 - High temperature annealed and slow cooled
5.2 O2 - Thermo-mechanically processed
5.3 O3 - Homogenized
6 Subdivisions of H (strain hardened) temper
       designations
6.1 First digit after H
6.2 Second digit after H
6.3 Third digit after H
6.4 Other digits after H
7 Subdivisions of T (thermally treated to produce
       tempers other than F, O or H) temper designations
7.1 First digit after T
7.2 Additional digits after T
7.3 Assigned additional digits for T tempers
7.3.1 Stress-relieved tempers
7.3.2 Numeral 2 as a second digit after T4 or T6
7.3.3 Variations of T7 type tempers
7.4 Recommendations for further T temper extensions
7.4.1 Numeral 1 as a second digit after T
7.4.2 Numerals 1 and 3 to 9 as a second digit after T3,
       T8 or T9
7.4.3 Numerals 1 and 3 to 5 as a second digit after T5
       or T6
7.4.4 Numeral 6 as a second digit after T5 or T6
7.4.5 Summary of possible uses of a second digit after
       T
8 Summary