aluminum alloy temper designation

H1 (non heat treatable alloy)

cold worked only

H2 (non heat treatable alloy)

cold worked and partially annealed

H3 (non heat treatable alloy)

cold worked and stabilized

H4 (non heat treatable alloy)

cold worked and baked

T1 (heat treatment identification)

cooled from an elevated temp. shaping process and naturally aged

T2 (heat treatment identification)

cooled from an elevated temp shaping process, cold worked, and naturally aged

T3 (heat treatment identification)

solution heat treated, cold worked, and naturally aged

T4 (heat treatment identification)

solution heat treated and naturally aged

T5 (heat treatment identification)

cooled from an elevated temp shaping process and artificially aged

T6 (heat treatment identification)

solution heat treated and artificially aged

T7 (heat treatment identification)

solution heat treated and artificially overaged

T8 (heat treatment identification)

solution heat treated, cold worked, and artificially aged

T9 (heat treatment identification)

solution heat treated, artificially aged, and cold worked

T10 (heat treatment identification)

cooled from an elevated temp shaping process, cold worked, and artificially aged

2 (degree of strain hardening)

¼ hard

4 (degree of strain hardening)

½ hard

6 (degree of strain hardening)

¾ hard

8 (degree of strain hardening)

fully hard

9 (degree of strain hardening)

extra hard

F

fabricated

O

annealed

H

cold worked

T

heat treated

W

solution heat treated