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The Benefits of Aluminum

Aluminum

Aluminum Alloy Designations

Alloy Designation System for Wrought Sheet Products

Aluminum alloys for sheet products are identified by a four-digit numerical system which is administered by the Aluminum Association. The alloys are conveniently divided into eight groups based on their principal alloying element. The first digit identifies the alloy group as follows:

ALLOY GROUPPRINCIPAL ALLOYING ELEMENT 
1xxx Unalloyed Aluminum  Purity of 99.0% or Greater
2xxx Copper  Heat Treatable Alloys
3xxx Manganese  
4xxx Silicon  Low Melting Point Alloys
5xxx Magnesium  
6xxx Magnesium and Silicon  Heat Treatable Alloys
7xxx Zinc  Heat Treatable Alloys
8xxx Other Elements  

The last two digits in the 1xxx group correspond with the two digits after the decimal which indicate the minimum aluminum content. For example the aluminum content of 1060 is 99.60% minimum, 1100 is 99.00% minimum, 1350 is 99.50% minimum and so on.

The last two digits of the other groups are sequential numbers issued by the Aluminum Association to ensure each alloy is uniquely identified.

The second digit in all the groups indicates a minor modification of the basic alloy. For instance, 5252 is the second modification of 5052 alloy.

This technical information has been contributed by
United Aluminum

Click on Company Name for a Detailed Profile

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