Numbers following T Continued

 

Designations Definition Example
T Thermally treated to achieve properties
T3 51 Solution heat treated and cold worked, stress relieved by stretching 2024-T351
T4 Solution heat treated 2017-T4
T6 51 1 Solution heat treated, artificially aged, stress relieved by stretching and straightened.  Only applies to extruded products. 6061-T6511
6063-T6511

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