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Aluminum

Aluminum Processing Capabilities:

  • Solutionize; capacity 500lbs; 32" x 48" x 30".
  • Annealing; Age Hardening; up to 50" x 150" x 50".
  • Thermal Cycle/Stress Relieve; 32" x 48" 30" (-140°F); 24" x 36" x 24" (-320°F).

The general types of heat treatments applied to aluminum and its alloys are:

  • Preheating or homogenizing, to reduce chemical segregation of cast structures and to improve their workability. Annealing, to soften strain-hardened (work-hardened) and heat treated alloy structures, to relieve stresses, and to stabilize properties and dimensions. Solution heat treatments, to effect solid solution of alloying constituents and improve mechanical properties; usually followed by Age Hardening. Syracuse Heat Treating has a Cryo Temper unit capable of thermal cycling aluminum parts to stress relieve for stability of part size and shape.

Basic Aluminum Heat Treatment Designations

  • F As Fabricated – No special control has been performed to the heat treatment or strain hardening after the shaping process such as casting, hot working, or cold working.
  • Annealed – This is the lowest strength, highest ductility temper.
  • H Strain Hardened – (applied to wrought products only) Used for products that has been strengthened by strain hardening, with or without subsequent heat treatment. The designation is followed by two or more numbers as discussed below.
  • W Solution Heat Treated – This is seldom encountered because it is an unstable temper that applies only to alloys that spontaneously age at ambient temperature after heat treatment.
  • T Solution Heat Treated – Used for products that has been strengthened by heat treatment, with or without subsequent strain hardening. The designation is followed by one or more numbers as discussed below.

Heat Treating T Temper Codes

  • T1 – Cooled from an elevated temperature shaping process and naturally aged to a substantially stable condition.
  • T2 – Cooled from an elevated temperature shaping process, cold worked, and naturally aged to a substantially stable condition.
  • T3 – Solution heat treated, cold worked, and naturally aged to a substantially stable condition.
  • T4 – Solution heat treated, and naturally aged to a substantially stable condition.
  • T5 – Cooled from an elevated temperature shaping process then artificially aged.
  • T6 – Solution heat treated then artificially aged.
  • T7 – Solution heat treated then overaged/stabilized.
  • T8 – Solution heat treated, cold worked, and then artificially aged.
  • T9 – Solution heat treated artificially aged, and then cold worked.
  • T10 – Cooled from an elevated temperature shaping process, cold worked, then artificially aged.

Additional digits may be used after the first T temper digit to indicate subsequent stress relieving by processes such as stretching, compressing, or a combination.