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Tempers

Mechanical properties of aluminium semi-finished products are determined not only by alloy (i.e. chemical composition) but by material treatment as well.

Note that tempers and alloys, which are not supplied by KUMZ, are not mentioned here.

There are four main groups of temper designation for aluminium alloys

  • F – Fabricated.
  • O – Annealed (the softest temper).
  • H – Strain hardened.
  • T – Thermally treated.

Strain hardening is applied to 5000 series alloys.

H1 - strain-hardened only. Products are strain-hardened to achieve the strength desired without additional thermal treatment.
Second digit is designated by the numbers 1 through 8 to define temper between that of annealed (O temper) and full hard.

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, but for which there are mechanical property limits.

Heat treatable series of alloys are 2000, 6000, 7000.

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.
T6 - Solution heat-treated and then 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.

Tx51 – Stress relieved by stretching (for aluminium sheet and plate).
Tx52 – Stress relieved by compressive deformation (for aluminium forged products)
Tx511 - Stress relieved by stretching and additional straightening (for aluminium bar, rod, tube).