Where used, the temper designation follows the alloy designation and is separated from it by a dash. The temper designation consists of a letter that indicated the basic temper that can be more specifically defined by the addition of one or more digits.


Nonheat-Treatable Alloys

Temper designation

Nonheat-Treatable Alloys

Definition

Heat-Treatable Alloys

Temper designation

Heat-Treatable Alloys

Definition

-O
Annealed recrystallized (wrought products only) applies to softest temper of wrought products.
-T42
Solution heat-treated by the user regardless of prior temper (applicable only to 2014 and 2024 alloys).
-H12
Strain-hardened one-quarter-hand temper.
-T5
Artificially aged only (castings only).
-H14
Strain-hardened half-hand temper.
-T6
Solution heat-treated and artificially aged.
-H16
Strain-hardened three-quarters-hard temper.
-T62
Solution heat-treated and aged by user regardless of prior temper (applicable only to 2014 and 2024 alloys).
-H18
Strain-hardened full-hard temper.

-T351, -T451

T3510, -T3511,

-T4510, -T4511

Solution heat-treated and stress relived by stretching to produce a permanent set of 1 to 3 percent, depending on the product.
-H22
Strain-hardened and partially annealed to one-quarter-hard temper.

-T651, -T851

-T6510, -T8510,

-T6511, -T8511

Solution heat-treated, stress relieved by stretching to produce a permanent set of 1 to 3 percent, and artificially aged.
-H24
Strain-hardened and partially annealed to half-hard temper.
-T652
Solution heat-treated, compressed to produce a permanent set and then artificially aged.
-H26
Strain-hardened and partially annealed to three-quarters-hard temper.
-T81
Solution heat-treated, cold-worked by flattening or straightening operation, and then artificially aged.
-H28
Strain-hardened and partially annealed to full-hard temper.
-T86
Solution heat-treated, cold-worked by reduction of 6 percent, and then artificially aged.


Characteristics of Aluminum Alloys
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