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Temper designation



The temper designation follows the cast or wrought designation number with a dash, a letter, and potentially a one to three digit number, e.g. 6061-T6. The definitions for the tempers are:

-F 

As fabricated

-H 

Strain hardened (cold worked) with or without thermal treatment

-H1 

Strain hardened without thermal treatment

-H2 

Strain hardened and partially annealed

-H3 

Strain hardened and stabilized by low temperature heating

Second digit 

A second digit denotes the degree of hardness

-HX2 = 1/4 hard

-HX4 = 1/2 hard

-HX6 = 3/4 hard

-HX8 = full hard

-HX9 = extra hard

-O 

Full soft (annealed)

-T 

Heat treated to produce stable tempers

-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 and cold worked

-T4 

Solution heat treated and naturally aged

-T5 

Cooled from hot working and artificially aged (at elevated temperature)

-T51 

Stress relieved by stretching

-T510 

No further straightening after stretching

-T511 

Minor straightening after stretching

-T52 

Stress relieved by thermal treatment

-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

-T10 

Cooled from hot working, cold-worked, and artificially aged

-W 

Solution heat treated only.

Note: -W is a relatively soft intermediary designation that applies after heat treat and before aging is completed. The -W condition can be extended at extremely low temperatures but not indefinitely and depending on the material will typically last no longer than 15 minutes at ambient temperatures.

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