|
Aluminum
Temper Designations
|
| F |
As
fabricated. No control over the amount
of strain hardening. |
| H |
Strain-hardened
(wrought products only) to increase
strength. |
| H1 |
Strain-hardened
only. Products are strain-hardened to
achieve the strength desired without
additional thermal treatment. |
| H1x,H2x,H3x |
The
second digit following the designations
H1, H2, H3 indicate the final degree
of strain hardening. The number 8 has
been assigned to tempers having a final
degree of strain-hardening equivalen
to that resulting from approxiamtely
75 % reduction in area. Tempers between
that of the 0 Temper (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. |
| T1 |
Naturally
aged. Product is cooled from an elevated
temperature shaping process and naturally
aged to a substantially stable condition.
|
| 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, cold worked and naturally
aged to a substantially stable condition
to improve strength. |
| T4 |
Solution
heat-treated and naturally aged to a
substantially stable condition. |
| T5 |
Cooled
from an elevated temperature shaping
process and the artificially aged.
|
| 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 restring cold in
the finish die. |
| T6 |
Solution
heat-treated and then artificially aged.
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 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. |
| T9 |
Solution
heat-treated, artificially aged, and
then cold worked. |
| T10 |
Artificially
aged and then cold worked. |
| 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. |
