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QUICK FACT GUIDES FOR MACHINISTS
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GUIDES |
TYPES OF ALUMINUM
The
1XXX group is at least 99% pure aluminum The
2XXX group is alloyed primarily with Copper, which is added for higher strength
but reduces the corrosion resistance The
3XXX group is alloyed primarily with Manganese, for moderate strength The
4XXX group is alloyed primarily with some Silicon to lower the melting point and
increase fluidity for casting The
5XXX group is alloyed primarily with Magnesium to make a moderate strength alloy
The
6XXX group is alloyed primarily with both Magnesium and Silicon to make a
moderate strength alloy The
7XXX group is alloyed primarily with Zinc to make a high strength alloy. The
8XXX group is used to indicate an alloy whose primary alloy element is other
than those above The 9XXX group has not so far been used or assigned. In
the alloys designated from the 2XXX to the 7XXX group, the last two digits
identify the uniquely different alloys in the series. As new alloys become
commercially available, the last two digits are assigned consecutively beginning
with XX01, (wouldn't you think they would be running short on these by now?).
The two digits bring with them a specific chemical composition range, which must
be adhered to. The
second digit indicates any modifications in the composition of the original
alloy used. If the second digit is "0", zero, there have been no
modifications made to the original assigned and designated alloy. If
modifications are made to the original alloy, integers 1 to 9, which are
assigned consecutively, are used to indicate the modification, and note commonly
its existence. New, experimental aluminum alloys are grouped with the
appropriate 1XXX to 9XXX series above but are prefixed with an "X".
The "X" is discontinued when the alloy becomes standard. |
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Copyright © 2002 QUICK FACT GUIDES FOR MACHINISTS
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