Aluminium temper designations and Classifications.

There are several aluminium heat treatment classifications are defined. These designations are defined as per the different needs and applications of the customers .

Temper	Definition
F	As fabricated (no mechanical property limits specified)  No special control has been performed to the heat treatment or strain hardening after the shaping process such as casting, hot working, or cold working
O	Annealed.This is the lowest strength, highest ductility temper.
H12	Stain Hardened, 1/4 Hard
H14	Stain Hardened, 1/2 Hard
H16	Stain Hardened, 3/4 Hard
H18	Stain Hardened, Full Hard
H19	Stain Hardened, Extra Hard
H111	Annealed and slightly strain hardened (less than H11)
H112	Slightly strain harden from working at an elevated temperature or from limited amount of cold work
H116	Applies to alloys in the 5xxx series with a magnesium content of 3% or more, slightly strain harden at last operation, exfoliation and intergranular corrosion resistance are specified
H22	Stain Hardened and Partially Annealed, 1/4 Hard
H24	Stain Hardened and Partially Annealed, 1/2 Hard
H26	Stain Hardened and Partially Annealed, 3/4 Hard
H28	Stain Hardened and Partially Annealed, Full Hard
H32	Stain Hardened and stabilized, 1/4 Hard
H34	Stain Hardened and stabilized, 1/2 Hard
H36	Stain Hardened and stabilized, 3/4 Hard
H38	Stain Hardened and stabilized, Full Hard
H321	Applies to alloys in the 5xxx series with a magnesium content of 3% or more, strain hardened and stabilized at last operation, exfoliation and intergranular corrosion resistance are specified
H42	Stain Hardened and painted or lacquered, 1/4 Hard
H44	Stain Hardened and painted or lacquered, 1/2 Hard
H46	Stain Hardened and painted or lacquered, 3/4 Hard
H48	Stain Hardened and painted or lacquered, Full Hard
T351	Solution heat-treated, cold worked, stress relived by stretching, and naturally aged
T4	Solution heat-treated and naturally aged
T451	Solution heat-treated , stress relived by stretching, and naturally aged
T6	Solution heat-treated and then artificially aged
T651	Solution heat-treated, stress relived by stretching, and artificially aged
T1	Cooled from an elevated temperature shaping process and naturally aged to a substantially stable condition.
T2	Cooled from an elevated temperature shaping process, cold worked, and naturally aged to a substantially stable condition.
T3	Solution heat treated, cold worked, and naturally aged to a substantially stable condition.
T4	Solution heat treated, and naturally aged to a substantially stable condition.
T5	Cooled from an elevated temperature shaping process then artificially aged.
T6	Solution heat treated then artificially aged.
T7	Solution heat treated then overaged/stabilized.
T8	Solution heat treated, cold worked, then artificially aged.
T9	Solution heat treated, artificially aged, then cold worked.
T10	Cooled from an elevated temperature shaping process, cold worked, then artificially aged.