The heat treatment and coding as applied to aluminium.
|H||Strain hardened by cold working with or without thermal treatment|
|H1X||Strain hardened without cold working|
|H2X||Strain hardened with partial annealed|
|H3X||Strain hardened and stabilized with low temperature heating|
|O||Annealed (Full Soft) or T0|
|T1||Cooled from hot working and naturally aged (at room temperature)|
|T2||Cooled from hot working, cold worked and naturally aged|
|T3||Solution heat treated, cold worked and naturally aged|
|T4||Solution heat treated and naturally aged|
|T5||Cooled from hot working and artificially aged (at elevated temperatures)|
|T6||Solution heat treated and artificially aged|
|T7||Solution heat treated and stabilized|
|T8||Solution heat treated, cold worked and artificially aged|
|T9||Solution heat treated, artificially aged and cold worked|
See also: Aluminium 1000 series, Aluminium 2000 series, Aluminium 3000 series, Aluminium 4000 series, Aluminium 5000 series, Aluminium 6000 series, Aluminium 7000 series, Aluminium 8000 series, Temper.