The temper designation follows
the alloy
designation and is separated from it by a hyphen.
The basic temper designations and
subdivisions are as follows:
1-0 Annealed, recrystallized
(wrought products only): Applies to
(he softest temper of wrought products.
2-H Strain-hardened (wrought products only): Applies to products which
have their strength increased by strain-hardening with or without
supplementary thermal treatments to produce
Subdivisions of H Temper: Strain-Hardened
The -H is always followed by two or more
digits. The first digit indicated the specific combination of basic operations,
as follows:
H-1 Strain-hardened only:
Applies to products which are strain-hardened to obtain the desired mechanical
properties without supplementary thermal treatment. The number following this
designation indicates the degree of stain-hardening.
H-2 Strain-hardened and then partially
annealed: Applies to products which are
stain-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 approximately the same ultimate strength as
the corresponding -H3 tempers. For other alloys, the -H2 tempers have
approximately the same ultimate strength as the corresponding -HI tempers and
slightly higher elongations. The number following this designation indicted the
degree of stain-hardening remaining after the product has been partially
annealed.
H-3 Strain-hardened and then stabilized:
Applies to products which are strain-hardened and then stabilized by a low
temperature heating to slightly lower their strength and increase ductility.
This designation applies only to the magnesium-containing alloys which, unless
stabilized, gradually age-soften at room temperature. The number following this
designation indicates the degree of strain-hardening remaining after the product
has been strain-hardened a specific amount and then stabilized.
The second digit
indicates stain hardening to the following degrees:
2 = 1/4 hard, 4 = 1/2 hard, 6 - 3/4
hard,
8 - fall hard, 9 - extra hard
The third digit
when used, indicates a variation of two-digit temper. It is used when the degree
of control of temper or the mechanical properties are different from but close
to those for the two-digit H temper designation to which it is added or when
some other characteristic is significantly affected.
3-T Thermally treated
Subdivisions of Т Temper: Thermally
Treated
Numerals 3 through 7 following the Т indicate specific sequences of basic
treatments, as follows:
T3 Solution heat-treated 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 recognized in mechanical property limits.
T4 Solution heat-treated and naturally aged to
a substantially stable condition.
Applies to products which 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 which are cooled from an
elevated temperature.
T6 Solution heat-treated and then artificially
aged. Applies to products which 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 then
stabilized. Applies to products which
are stabilized to carry them beyond the point of maximum strength
to provide control of some special characteristics.
Additional Digits for Т Tempers
The following specific additional digits have
been assigned for stress-relieved tempers of wrought products.
Txx51
Stress relieved by stretching. Applies to the following products when
stretched the indicated amounts after solution heat-treatment or cooling from
an elevated temperature shaping process.
Txx52 Stress-relieved by compressing.
Applies to products which are stress-relieved by compressing after solution
heat-treatment,or cooling from an elevated temperature shaping process to
produce a permanent set of 1 to 5 percent.
