T1 Cooled from an elevated temperature shaping process and naturally aged to a substantially stable condition. Usually associated with extruded products and limited to certain of the 6xxx series alloys.
T2 Cooled from an elevated temperature shaping process, cold worked, and naturally aged to a substantially stable condition. Usually associated with cast products.
T3 Solution heat-treated, cold worked, and naturally aged to a substantially stable condition. The working serves to increase the strength. (T4+cold work)
T4 Solution heat-treated and naturally aged to a substantially stable condition.
T5 Cooled from an elevated temperature shaping process and artificially aged. Usually associated with extruded products in certain of the 6xxx series alloys. (T1+artificial age)
T6 Solution heat-treated and artificially aged. A stable temper. (T4+artificial age)
T7 Solution heat-treated and overaged/stabilized. Applies to alloy products which are thermally over-aged after solution heat-treatment to carry them beyond the point of maximum strength to provide control of some special characteristic. A stable temper.
T8 Solution heat-treated, cold worked, and artificially aged. A stable temper. (T3+artificial age)
T9 Solution heat- treated, artificially aged, and cold worked. A stable temper. (T6+cold work)
T10 Cooled from an elevated temperature shaping process, cold worked, and artificially aged. Usually associated with cast products. A stable temper. (T2+artificial age)
Additional digits, the first of which shall not be zero, may be added to the basic designations to indicate a variation in treatment which significantly alters the characteristics of the product.
The following specific additional digits have been assigned for stress-relieved tempers of wrought products:
T-51 Applies to certain products when stress-relieved by stretching the indicated amount. Stretching is performed after solution heat treatment or after cooling from an elevated temperature shaping process. No straightening takes place after stretching.
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Plate |
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permanent set 1.5 to 3% |
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Rolled or cold finished rod or bar |
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permanent set 1 to 3% |
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Die or ring forgings |
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permanent set 1 to 5% |
T-510 Applies to extruded products and to drawn tube when stress-relieved by stretching the indicated amount. Stretching is performed after solution heat treatment or after cooling from an elevated temperature shaping process. No straightening takes place after stretching.
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Rod, bar, shapes and tube |
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permanent set 1 to 3% |
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Drawn tube |
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permanent set 0.5 to 3% |
T-511 Applies to extruded products, and to drawn tube when stress-relieved by stretching the indicated amount. Stretching is performed after solution heat treatment or after cooling from an elevated temperature shaping process. These products may receive minor straightening after stretching to comply with standard tolerances.
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Bar, shapes and tube |
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permanent set 1 to 3% |
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Drawn tube |
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permanent set 0.5 to 3% |
T-52 Applies to products stress-relieved by compressing.
T-54 Applies to die forgings stress-relieved by restriking cold.
The following temper designations have been assigned for wrought test material heat-treated from annealed (0, 01, etc.) or F temper, or to wrought products heat-treated from any temper by the user. The former demonstrates a response to heat-treatment.
T42 Solution heat-treated and naturally aged to a
substantially stable condition.
T62 Solution heat-treated and artificially aged to a
substantially stable condition.
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