What’s up guys? This is Michael with Michael Talks Metal back for another talk on Aluminum. Before we get into it – if you find these videos useful and haven’t subscribed, please do. If not, drop a like below. Thank you and let’s jump in!

Today we are talking about the heat treatable aluminum alloys in the 2xxx series…..Alloys where the primary alloying element is copper and typically age hardened either at room temperature…the  naturally aged tempers or by heating….the artificially aged tempers. Products are normally heat treated by the producing mill.

For a review of the heat treated temper designations or if you did not see the prior video click here now.

The Aluminum Association, the American industry organization that has established standards also uses a comparative rating system for various properties of aluminum alloys.

An A rating is the most favorable and E is the least.  Again, these are comparisons within aluminum alloys. An alloy and temper rated “A” is superior to one rated “B” and so on.

In general, the 2xxx series machines well but is not highly rated for general or stress corrosion applications as compared to other alloys.

Most popular wrought alloys in this series are  2011, 2014, 2017 and 2024.

Aluminum chemistry requirements contain a restriction of .point 05% maximum each for any unspecified elements and a total of point 15% maximum which applies to all these alloys.

2011 UNS  A92011

An alloy of 5 point 0 to 6 point 0 %copper, point 40 % .max Silicon, point 7% max iron.   point 2 to point 6 % each of lead and bismuth are added for machinability.  With lead restricted  for many applications, low lead versions are used for compliance where feasible.

Used for screw machine products where the A machinability is much more important than the D  rating for general corrosion performance.

Tempers T 3, T4, and T8 are the most common and the T8 temper has better stress corrosion rating

2014 UNS A92014

Copper content is 3 point 9 to 5 point 0 % with point 5 to 1 point 2% silicon,  point 7% maximum iron, point 40 to 1 point 2% manganese, point 4 to point 8 % magnesium., point 10 % maximum chromium, point 25 maximum zinc, and point 15 maximum titanium.

Common tempers are T4 and T6 and their variations.  Used in truck frames and aircraft structures.

Rated D for general corrosion and B for machinability

2017 UNS A92017

An alloy of 3point five to 4 point 5% copper with point 2 to point 8 % silicon, point 7%  maximum iron, point 4 to 1 % manganese, point 4 to point 8 % magnesium, point 10 % maximum chromium, p0int 25% maximum zinc, and point 15% maximum titanium.

Common tempers are  T4 and T451 rated B for machining applications..  D rating for general corrosion resistance. Used in fittings

2024  UNS A92024

An alloy of 3 point 8 to 4 point 9 % copper with point 5 % maximum each of silicon and iron, point 3 to point 9 % manganese, 1point 2 to 1 point 8 % magnesium, point 10% maximum chromium, point  25 % maximum zinc, and point 15 % maximum titanium.

Common tempers are T3, T4, and T6 and their variants. General corrosion rating is D and machining is rated B.

Applications include aircraft structures, truck components, and fittings

Commercial applications generally specify ASTM standards. Aerospace applications utilize AMS standards or government  defense and federal standards.

As always, there are detailed requirements within  the full temper designation and any specifications that can require specific products and processing so we caution you to carefully check the specs !!!!!!!!!

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