A Comparison of A5000 and A6000 Series Aluminum Alloys
2025/9/26
Most aluminum used in CNC machining is alloyed with other metals. Pure aluminum, while lightweight and rust-resistant, is too soft, easily scratched, and not strong enough for machining.
To solve this, metals are added to improve strength. The series number of an aluminum alloy indicates its main alloying elements. This article compares the 5000 and 6000 series aluminum alloys.
5000 Series
Contains magnesium as the primary alloying element.
Offers excellent corrosion resistance, good strength, and high machinability.
The most widely used series for CNC machining.
Common applications: architectural exteriors, vehicles, ship materials, and automotive wheels.
6000 Series
Contains magnesium and silicon, giving it higher strength and corrosion resistance than the 5000 series.
Also offers good machinability.
Common applications: ships, vehicles, cranes, building materials, and structural components.
Similarities
Both contain magnesium, providing strength and corrosion resistance.
Both offer good machinability and are widely used in manufacturing.
The 5000 series is more common in CNC machining, but both perform well.
Differences
Alloying Elements
Alloying Elements
5000 series: magnesium
6000 series: magnesium + silicon (higher strength)
Heat Treatment
5000 series: non-heat-treatable, strengthened through cold working (e.g., rolling).
6000 series: heat-treatable, strengthened through quenching and tempering.
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If you’re unsure about material selection or machining methods, we offer complimentary consultations to help optimize your design and production. For any questions, please feel free to contact us.
