F (as Fabricated) - no particular control over thermal conditions or strain-hardening has been exercised.

Q (as Annealed) - Has been processed to obtain the lowest tensile strength.  For wire, this temper is achieved by fully annealing the product after the last strain-hardening process.  For Continuous cast rod, this temper is achieved by controlling the process parameters during the continuous casting and rolling operations.

H (Strain Hardened) - Tensile strength has been increased by strain-hardening, possibly followed by a thermal treatment to reduce the tensile strength to a desired level.

The first digit following the H indicates whether the material received a thermal treatment:

The second digit indicates the hardening of the material measured in 1/8s. For example:

T (Thermally Treated) - Has been thermally treated to produce a stable temper other than F, O or H.

Numbers following the T indicate specific sequence of operations:

A second digit indicates a variation in treatment that significaantly affects the material properties that otherwise would be obtained using the basic treatment.

 

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Temper Information

Temper Information

F (as Fabricated) - no particular control over thermal conditions or strain-hardening has been exercised.

Q (as Annealed) - Has been processed to obtain the lowest tensile strength.  For wire, this temper is achieved by fully annealing the product after the last strain-hardening process.  For Continuous cast rod, this temper is achieved by controlling the process parameters during the continuous casting and rolling operations.

H (Strain Hardened) - Tensile strength has been increased by strain-hardening, possibly followed by a thermal treatment to reduce the tensile strength to a desired level.

The first digit following the H indicates whether the material received a thermal treatment:

  • H1 indicates no thermal treatment
  • H2 indicates a partial-anneal
  • H3 indicates a stabilizing thermal treatment for alloysthat age-soften

The second digit indicates the hardening of the material measured in 1/8s. For example:

  • H14 indicates the material is for 1/8s or 1/2 hard
  • H18 is eight 1/8s or full-hard
  • H19 is nine 1/8s or extra-hard

T (Thermally Treated) - Has been thermally treated to produce a stable temper other than F, O or H.

Numbers following the T indicate specific sequence of operations:

  • T4 indicates solution heat-treated and naturally aged
  • T6 indicates solution heat-treated and artificially aged
  • T8 indicates solution heat-treated, cold worked and artifically aged

A second digit indicates a variation in treatment that significaantly affects the material properties that otherwise would be obtained using the basic treatment.