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Aluminum alloys are designated using a four-digit numbering system
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ALUMINIUM ALLOY NUMBERING SYSTEM
Aluminum alloys are designated using a four-digit numbering system
Main Alloying Element
1st Digit Meaning?
1xxx
99% Aluminum Alloy
2xxx
Copper
3xxx
Manganese
4xxx
Silicon
5xxx
Magnesium
6xxx
Magnesium + Silicon
7xxx
Zinc
8xxx
Other Elements
Modification done on the Alloy
2nd Digit Meaning?
Alloy Identifier
Last 2 Digits?
Temper Designation
Extra digits?
The “T6” designation indicates that the alloy has been solution heat-treated and artificially aged. H and T designations have specific subdivisions.
F
As Fabricated
O
Annealed
H
Strain Hardened
W
Solution Heat-Treated
T
Thermally Treated