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F
As fabricated
O
Annealed
H
Strain Hardened (Non-heat treatable products only)
W
Solution Heat Treated
T
Heat treated to produce stable tempers other than F, O, or H
H1
Strain hardened produced by cold working the metal to the desired dimension.
H2
Strain hardened, then partially annealed to remove some of the hardness.
H3
Strain hardened, then stabilized.
2
The ¼ degree of hardening is indicated by
4
The 1/2 degree of hardening is indicated by
6
The 3/4 degree of hardening is indicated by
8
The full hard degree of hardening is indicated by
9
The extra hard degree of hardening is indicated by