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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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