|
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 |