F As fabricated
Applies to the products of shaping processes in which no special control over thermal conditions or strain hardening is employed. For wrought products, there are no mechanical property limits.
O Annealed
Applies to wrought products that are annealed to obtain the lowest strength temper and to cast products that are annealed to improve ductility and dimensional stability. The O may be followed by a digit other than zero.
H Strain-hardened
Applies to products that have their strength increased by strain-hardening, with or without supplementary thermal treatments to produce some reduction in strength. The H is always followed by two or more digits. [Click here to go to the subdivisions of H Temper.}
W Solution heat-treated
An unstable temper applicable only to alloys that spontaneously age at room temperature after solution heat-treatment. This designation is specific only when the period of natural aging is indicated; for example; W 1/2 hr.
T Thermally treated to produce stable tempers other than F, O, or H
Applies to products that are thermally treated, with or without supplementary strain-hardening, to produce stable tempers. The T is always followed by one or more digits. [Click here to go to the subdivisions of T Temper.]
H1 Strain-hardened only applies to products that are strain-hardened to obtain the desired strength without supplementary thermal treatment. The number following this designation indicates the degree of strain-hardening.
H2 Strain-hardened and partially annealed applies to products that are strain-hardened more than the desired final amount and then reduced in strength to the desired level by partial annealing. For alloys that age-soften at room temperature, the H2 tempers have the same minimum ultimate tensile strength as the corresponding H3 tempers. For other alloys, the H2 tempers have the same minimum ultimate tensile strength as the corresponding H1 tempers and slightly higher elongation. The number following this designation indicates the degree of strain-hardening remaining after the product has been partially annealed.
H3 Strain-hardened and stabilized applies to products that are strain-hardened and whose mechanical properties are stabilized either by a low temperature thermal treatment or as a result of heat introduced during fabrication. Stabilization usually improves ductility. This designation is applicable only to those alloys that, unless stabilized, gradually age- soften at room temperature. The number following this designation indicates the degree of strain-hardening remaining after the stabilization treatment.
H4 Strain-hardened and lacquered or painted applies to products that are strain-hardened and subjected to some thermal operation during the subsequent painting or lacquering operation. The number following this designation indicates the degree of strain-hardening remaining after the product has been thermally treated as part of the painting/lacquering cure operation. The corresponding H2X or H3X mechanical property limits apply.
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T1 Cooled from an elevated temperature shaping process and naturally aged to a substantially stable condition
Applies to products that are not cold worked after cooling from an elevated temperature shaping process, or in which the effect of cold work in flattening or straightening may not be recognized in mechanical property limits.
T2 Cooled from an elevated temperature shaping process, cold worked, and naturally aged to a substantially stable condition
Applies to products that are cold worked to improve strength after cooling from an elevated temperature shaping process, or in which the effect of cold work in flattening or straightening is recognized in mechanical property limits.
T3 Solution heat-treated cold worked and naturally aged to a substantially stable condition
Applies to products that are cold worked to improve strength after solution hear-treatment, or in which the effect of cold work in flattening or straightening is recognized in mechanical property limits.
T4 Solution heat-treated and naturally aged to a substantially stable condition
Applies to products that are not cold worked after solution heat-treatment, or in which the effect of cold work in flattening or straightening may not be recognized in mechanical property limits.
T5 Cooled from an elevated temperature shaping process and then artificially aged
Applies to products that are not cold worked after cooling from elevated temperature shaping process, or in which the effect of cold work in flattening or straightening may not be recognized in mechanical property limits.
T6 Solution heat-treated and then artificially aged
Applies to products that are not cold worked after solution heat-treatment, or in which the effect of cold work in flattening or straightening may not be recognized in mechanical property limits.
T7 Solution heat-treated and overaged/stabilized
Applies to wrought products that are artificially aged after solution heat-treatment to carry them beyond a point of maximum strength to provide control of some significant characteristics . Applies to cast products that are artificially aged after solution heat- treatment to provide dimensional and strength stability.
T8 Solution heat-treated , coldworked, and then artificially aged
Applies to products that are cold worked to improve strength, or in which the effect of cold work in flattening or straightening is recognized in mechanical property limits.
T9 Solution heat-treated, artificially aged, and then cold worked
Applies to products that are cold worked to improve strength.
T10 Cooled from an elevated temperature shaping process, cold worked, and then artificially aged
Applies to products that are cold worked to improve strength, or in which the effect of cold work in flattening or straightening is recognized in mechanical property limits.
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