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Material Designations

Aluminum Temper Designations by swertel
Posted: 27 Jun 02 (Edited 1 Jul 02)

From The Science and Engineering of Materials by Donald R. Askeland

Aluminum alloys can be divided into two major groups: wrought and casting alloys.  These groups can be divided into two sub-groups: heat-treatable and nonheat-treatable alloys.

The temper designation (T or H) refers to heat-Treated or strain-Hardened.  Other designations include annealed (O), solution-treated (W), or as-fabricated (F).  The numbers following the T or H refer to the type of heat treatment or amount of strain hardening.

F: AS-FABRICATED (hot-worked, forged, cast, etc.)
O: ANNEALED (in the softest possible condition)
H: COLD-WORKED
  H1x--cold-worked only (x refers to the amount of cold work and strengthening.)
  H12--cold work that gives a tensile strength midway between O and H14 tempers.
  H14--cold work that gives a tensile strength midway between O and H18 tempers.
  H16--cold work that gives a tensile strength midway between H14 and H18 tempers.
  H18--cold work that gives about 75% reduction.
  H19--cold work that gives a tensile strength greater than 2000 psi of that obtained by the H18 temper.
  H2x--cold-worked and partially annealed.
  H3x--cold-worked and stabilized at a low temperature to prevent age hardening of the structure.
W: SOLUTION-TREATED
T: AGE-HARDENED
  T1--cooled from the fabrication temperature and naturally aged.
  T2--cooled from the fabrication temperature, cold-worked, and naturally aged.
  T3--solution-treated, cold-worked, and naturally aged.
  T4--solution-treated and naturally aged.
  T5--cooled from the fabrication temperature and artificially aged.
  T6--solution-treated and artificially aged.
  T7--solution-treated and stabilized by overaging.
  T8--solution-treated, cold-worked, and artificially aged.
  T9--solution-treated, artificially aged, and cold-worked.
  T10--cooled from the fabrication temperature, cold-worked, and artificially aged.

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