HEAT TREATMENT IDENTIFICATION / HARDNESS DESIGNATION

T

Solution heat treated

T2

Annealed (cast products only)

T3

Solution heat-treated, followed by strain hardening.

T36

Solution heat-treated, followed by strain hardening. Material has been solution heat-treated and has had its thickness reduced 6 percent by cold rolling.

T4

Solution heat-treated, followed by natural aging at room temperature to a stable condition.

T5

Artificially aged after being rapidly cooled during a fabrication process such as extrusion or casting.

T6

Solution heat-treated, followed by artificial aging (precipitation heat-treated).

T7

Solution heat-treated, then stabilized to control its growth and distortion.

T8

Solution heat-treated, strain hardened, and then artificially aged

T9

Solution heat-treated, artificially aged and then strain hardened

T10

Artificially aged and then cold worked.

F

As Fabricated

O

Annealed, recrystallized (wrought materials only).

H

Strain hardened

Hi

Strain Hardened Only

H2

Strain Hardened and PArtially Annealed

H3

Strain Hardened and stabilized

Hx2

Quarter -Hard

Hx4

Hafl-Hard

Hx6

Three-quarter hard

Hx8

Full-hard

Hx9

Extra-hard