| INDIA
or
U.K. |
U.S.A.
or
CANADA |
DESCRIPTION
OF
DESIGNATION |
| O |
O |
Annealed |
| M |
F |
As
fabricated
or
Manufactured
or
cast |
| -- |
T3 |
Solution
heat
–
treated,
and
Cold
worked |
| W |
T4 |
Solution
heat
–
treated,
naturally
aged
and
amenable
to
artificial
ageing |
| P |
T5 |
Artificially
aged
or
precipitation
heat
–
treated |
| WP |
T6 |
Solution
heat
–
treated
and
precipitation
heat
-
treated |