Subdivision of T Temper:  Thermally Treated

These T- tempers indicate what stage the alloy is in when starting any type of processing. The different T numbers tell you what can be done with the many different aluminum alloys.

 

  1. Cooled from an elevated temperature shaping process and naturally aged to a substantially stable condition. Applies to products that are not cold worked after cooling from an elevated temperature shaping process, or in which the effect of cold work in flattening or straightening may not be recognized in mechanical property limits.
  2. Cooled from an elevated temperature shaping process, cold worked, and naturally aged to a substantially stable condition. Applies to products that 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 recognized in mechanical property limits.
  3. Solution heat-treated®, cold worked, and naturally aged to a substantially stable condition. Applies to products that are cold worked to improve strength after solution heat-treatment, or in which the effect of cold work in flattening or straightening is recognized in mechanical property limits.
  4. Solution heat-treated® and naturally aged to a substantially stable condition. Applies to products that 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.
  5. Cooled from an elevated temperature shaping process and then artificially aged. Applies to products that are not cold worked after cooling from an elevated temperature shaping process, or in which the effect of co!d work in flattening or straightening straightening may not be recognized in mechanical property limits.
  6. Solution heat-treated® and then artificially aged. Applies to products that 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.
  7. Solution heat-treated® and overaged/stabilized. Applies to wrought products that are artificially aged after solution heat-treatment to carry them beyond a point of maximum strength to provide control of some significant characteristics. Applies to cast products that are artificially aged after solution heat-treatment to provide dimensional and strength stability.
  8. Solution heat-treated®, cold worked, and then artificially aged. Applies to products that are cold worked to improve strength, or in which the effect of cold work in flattening or straightening is recognized in mechanical property limits.
  9. Solution heat-treated®, artificially aged, and then cold worked. Applies to products that are cold worked to improve strength.
  10. Cooled from an elevated temperature shaping process, cold worked, and then artificially aged. Applies to products that are cold worked to improve strength, or in which the effect of cold work in flattening or straightening is recognized in mechanical property limits.

 

Examples of T Tempers for Alloys

  • The 6061 alloy for example starts off with a T-0 condition or is annealed and very soft. It can then be taken to a T-4 condition which is starting the hardening process. This material can then be age to a full T-6 condition.
  • 2024 material starts out in a T-0 annealed condition, then quickly solution to a T-42 condition and this material will then age harden to a full T-6 condition over the next 3 to 4 days. If this material is in a T3 or T35 condition, then it needs to be age to get this material to a T8 or T851 condition.
  • 7075 material can also start out in a T-0 condition, be formed is sheet metal, then processed to a T-4 condition, then aged to a T6 or a T73 condition which is an overage condition for this material.