METALS RECAP: ALUMINIUM ALLOY NUMBERING SYSTEM

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Aluminum alloys are designated using a four-digit numbering system

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18 Terms

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ALUMINIUM ALLOY NUMBERING SYSTEM

Aluminum alloys are designated using a four-digit numbering system

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Main Alloying Element

1st Digit Meaning?

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1xxx

99% Aluminum Alloy

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2xxx

Copper

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3xxx

Manganese

6
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4xxx

Silicon

7
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5xxx

Magnesium

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6xxx

Magnesium + Silicon

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7xxx

Zinc

10
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8xxx

Other Elements

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Modification done on the Alloy

2nd Digit Meaning?

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Alloy Identifier

Last 2 Digits?

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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.

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F

As Fabricated

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O

Annealed

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H

Strain Hardened

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W

Solution Heat-Treated

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T

Thermally Treated