The table below provides a general comparison of key characteristics of various aluminum alloys.
For each characteristic, we have provided ratings, with A the best and, depending on the characteristic, C, D or E the least attractive.
Notes below the table provide additional information about the way the ratings were developed.
Click on any alloy number for a list of products made from that alloy.
Ratings reflect merit. Alloys rated A have the best characteristics.
Corrosion resistance: Ratings A and B indicate alloys that can be used in industrial and seacoast atmosphere without protection. Alloys rated C, D and E should be protected on faying surfaces.
Stress corrosion cracking: Based on experience and lab tests, alloys rated A show no known instance of failure, alloys rated B have not failed in service but were observed to suffer limited failures in lab tests, while alloys rated C suffered service failures under sustained stress transfers to grain as well as lab failures.
Weldability and brazability: An A rating designates alloys that are generally weldable by all commercial procedures and methods. B designates alloys that are weldable with special techniques; we recommend you test the alloy before committing to a process. C designates alloys with limited weldability because of increased susceptibility to cracking, loss of resistance to corrosion and other undesirable mechanical changes. D designates alloys for which there are no widely used techniques to produce successful welds.