Temper designations
O Annealed
H Strain hardened
F Fabricated (as cast)
T Thermally treated to produce stable tempers other than F, O or H
T1 Cooled from an elevated temperature shaping process and naturally aged
T2 Cooled from an elevated temperature shaping process, cold worked and naturally aged
T3 Solution heat treated, cold worked and naturally aged
T4 Solution heat treated and naturally aged
T5 Cooled from an elevated temperature shaping process and then artificially aged
T6 Solution heat treated and then artificially aged
T7 Solution heat treated and then artificially overaged (stabilised)
T8 Solution heat treated, cold worked and then artificially aged
T9 Solution heat treated, artificially aged and then cold worked
W Solution heat treated (unstable temper)
EN 515:1993 Aluminium and aluminium alloys. Wrought products. Temper designations