Temper designation


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Temper designation - short version

A letter-digit code used to designate the mechanical and/or thermal treatment to which a metal alloy has been subjected.



Temper designation - long version

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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