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Temper descriptions

All aluminum alloys, regardless of product form, are classified as either heat-treatable or nonheat-treatable, depending upon the method used to attain their maximum strength.

  • Nonheat-treatable alloys: 1xxx, 3xxx, and 5xxx series develop strength characteristics through cold work after extruding, if the section shape permits.
  • Heat-treatable alloys: 2xxx, 6xxx, and 7xxx series, which have the highest strength of all aluminum alloys, attain their maximum strength through controlled heat treatment, sometimes at the extrusion press and sometimes in a separate furnace.

The modification methods applied to heat- and nonheat-treatable alloys are listed in the Temper Designation System below.

A complete alloy-temper designation reads like this: 6063-T5. This designation indicates a particular alloy of the 6xxx series (Mg and Si), which is thermally treated by being cooled from an elevated temperature and artificially aged. 

Typical Tempers for Extrusions