eFunda: Temper Designations of Aluminum Alloys
engineering fundamentals Temper Designations of Aluminum Alloys
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Temper Designations
F  As fabricated. Applies to products in which no thermal treatments or strain-hardening methods are used to shaped the product.
H  Strain-hardened (wrought products only). Applies to products which have their strength increased by strain-hardening, with or without additional thermal treatments to produce a reduction in strength.
H1  Strain-hardened only. Applies to products which are strain-hardened to achieve the strength desired without additional thermal treatment.
H1x,H2x,H3x  The second digit (x) following the designations H1, H2, H3 indicates the final degree of strain hardening and can range from 0 to 8. The number 8 has been assigned to tempers having a final degree of strain-hardening equivalent to that resulting from approxiamtely 75% reduction in area. Tempers between 0 (annealed) and 8 (full-hard) are designated by the numbers 1 through 7. A number 4 (which is halfway between 0 and 8) designation is considered half-hard; number 2 is considered quarter-hard; and the number 6 is three-quarter hard. When the number is odd, the limits of ultimate strength are exactly halfway between those of the even numbered tempers.
Hxxx  The third digit indicates a variation of the two digit H temper. It is used when the degree of temper is close to the 2 digit H temper.
H111  Applies to alloys which are strain-hardened less than the amount required for a controlled H11 temper.
H112  Applies to alloys that acquire some temper from shaping processes which do not have special control over the amount of strain-hardening or thermal treatment, but for which there are mechanical property limits.
H2  Strain-hardened and partially annealed. Applies to alloys which are strain-hardened more than the desired final amount and then reduced in strength to the desired level by partial annealing. For alloys that soften with age at room temperature, the H2 tempers have the same minimum tensile strength as the corresponding H3 tempers. For other alloys, the H2 tempers have the same minimum tensile strength as the corresponding H1 tempers and slightly higher elongation.
H3  Strain-hardened and stabilized. Applies to alloys that are strain-hardened and whose mechanical properties are stabilized by a low temperature thermal treatment that results in slightly lowered tensile strength and improved ductility. This designation is applicable only to those alloys that unless they are stabilized, will gradually soften with age at room temperature.
H311  Applies to alloys which are strain-hardened less than the amount required for a controlled H31 temper.
H321  Applies to alloys which are strain-hardened less than the amount required for a controlled H32 temper.
H323  Applies to products which are fabricated to have good resistance to stress corrosion cracking.
H343  Applies to products which are fabricated to have good resistance to stress corrosion cracking.
O  Annealed, recrystallized (wrought products only). Applies to wrought alloys which are annealed to obtain the softest temper, and to cast alloys which are annealed to improve ductility and dimensional stability.
T  Thermally treated to produce stable tempers other than F, O or H. Applies to products which are thermally treated, with or without additional strain-hardening, to produce stable tempers.
T1  Naturally aged to a substantially stable condition. Applies to alloys which are not cold worked after cooling from a high temperature shaping process, or in which the effect of cold working in flattening or straightening may not be significant in mechanical property limits.
T2  Annealed (cast products only). Applies to alloys which 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 significant in mechanical property limits.
T3  Solution heat-treated and then cold worked. Applies to alloys which are cold worked to improve strength after solution heat treatment, or in which the effect of cold work in flattening or straightening is significant in mechanical property limits.
T4  Solution heat-treated and naturally aged to a substantially stable condition. Applies to alloys which are not cold worked after solution heat treatment, or in which the effect of cold work in flattening or straightening may not be significant in mechanical property limits. T42 indicates material is solution heat treated from the O or F temper to demonstrate response to heat-treatment, and naturally aged to a substantially stable condition.
T5  Artificially aged only. Applies to alloys which 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 significant in mechanical property limits.
T51  Stress relieved by stretching. Applies to the following products when stretched the indicated amounts after solution heat-treatment or cooled from a high temperature shaping process: Plate—1.5-3% permanent set; Rod, bar, shapes, and extruded tubes—1-3% permanent set; Drawn tubes— 1.5-3% permanent set. Applies directly to plate, and rolled or cold finished rod and bar which receive no further straightening after stretching. Applies to extruded rod, bar, shapes, tubing, and to drawn tubing when designated as follows: T510 Products that receive no further straight ending after stretching; T511 Products that may receive minor straightening after stretching to comply with standard tolerances.
T52  Stress-relieved by compressing. Applies to alloys which are stress-relieved by compressing after solution heat-treatment, or cooled from a high temperature shaping process to produce a permanent set of 1 to 5%.
T54  Stress-relieved by combined stretching and compressing. Applicable to die forging which are stress-relieved by restriking cold in the finish die.
T6  Solution heat-treated and then artificially aged. Applies to alloys which are not cold worked after solution heat-treatment, or in which the effect of cold work in flattening or straightening may not be significant in mechanical property limits. T62 indicates material is solution heat-treated from the O or F temper to demonstrate response to heat-treatment, and artificially aged.
T7  Solution heat-treated and then stabilized. Applies to products which are stabilized after solution heat-treatment to carry them beyond the point of maximum strength to provide control of some special property.
T8  Solution heat-treated, cold worked, and then artificially aged. Applies to products which are cold worked to improve strength, or in which the effect of cold work in flattening or straightening is significant in mechanical property limits.
T9  Solution heat-treated, artificially aged, and then cold worked. Applies to alloys which are cold worked to improve strength.
T10  Artificially aged and then cold worked. Applies to products which are cold worked to improve strength, or in which the effect of cold work in flattening or straightening is significant in mechanical property limits.
T42  (Wrought products only). Applicable to products solution heat-treated and naturally aged which have mechanical properties different from those of the T4 temper.
T62  (Wrought products only). Applicable to products solution heat-treated and artificially aged which have mechanical properties different from those of the T6 temper.
W  Solution heat treated. An unstable temper applied only to alloys which spontaneously age at room temperature after solution heat-treatment.
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