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Aluminium tempers and conditions

Aluminium Tempers and Conditions

The hardness and strength of a finished grade of aluminium can be determined by the final heat treatment process. The temper / condition is usually defined by a series of letters and numbers immediately after the grade, for example 6082 T6.

Extrusion tempers are defined by their thermally treated designation beginning with ‘T’ and flat products are either ‘O’ or begin with ‘H’.

  • O - Annealed (fully soft)
  • H - Strain Hardened / Cold Worked

Flat Products

  • HXxx
    • 1 = Cold Work Hardened Only
    • 2 = Cold Work Hardened and partially annealed
    • 3 = Cold Work hardened and stabalised by heat treatment
  • HxXx
    • 8 = Fully Hard
    • 6 = 3/4 Hard
    • 4 = 1/2 Hard
    • 2 = 1/4 Hard
    • 1 = Just harder than 'O'

Long Products

  • T - Thermally Treated
    • T4 = Naturally aged (soft)
    • T5 = Cooled and artifically aged
    • T6 = Artifically aged

You can find more specific grade realted information by referring to our datasheets.

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