ALUMINUM
CHARACTERISTICS BY ALLOY
Aluminum casting alloys each exhibit their own characteristics. How they’re used and which applications they fi t best depends on their castability, machinability, fi nishing tendencies and other factors.
I A206 A356.0
A380.0/B380.0 A390.0/B390.0 535 712
AN MCDP STAFF REPORT
nside the aluminum family, the various alloys exhibit marked and unique manufacturing characteristics that distinguish themselves. Generally, cast aluminum should be used for applications that require lower weight and structure without necessariliy needing high strength at elevated temperatures. To help you choose the best fi t, the following breaks down the castability, machinability, fi nishing tendencies, weldability and corrosion resistance of common alumi-
num casting alloys (Table 1).
Alloy A206.0 Alloy 206 is a high strength aluminum alloy often used for structural cast-
Table 1. Manufacturing Characteristics of Aluminum Alloys Alloy
Castability Fair
319.0/A319.0/B319.0/320.0 Good 356
Excellent Excellent Good Good Fair
Fair- Good
Machinability Excellent Good Good Good Good
Good-Excellent Excellent Excellent
42 | METAL CASTING DESIGN & PURCHASING | Jul/Aug 2016 Finishing
Good-Excellent Fair-Good
Good-Excellent Fair- Good
Good-Excellent - -
Good
ing components in automotive and aerospace applications where high tensile and yield strength are required and moderate elongation is acceptable. Typical applications in- clude gear housings, cylinder heads, turbines and impellers, and other applications where high strength at elevated temperatures is necessary for service life. Castability—With low silicon
Weld
Good-Fair Good Good
Excellent Fair Fair
Good Fair
Corrosion Fair
Good
Excellent Good
Poor-Fair
Good-Excellent Excellent Good
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