A Comparison of A5000 and A6000 Series Aluminum Alloys

Key Takeaways

• The 5000 and 6000 series aluminum alloys both offer excellent corrosion resistance and machinability, making them popular choices for CNC machining.

• The 5000 series is strengthened with magnesium, while the 6000 series adds silicon for higher strength and heat-treatability.

• Material selection depends on the required balance of strength, corrosion resistance, and manufacturing method.

Overview

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.

CNC Machining at Yumoto Electric

Yumoto Electric delivers high-quality components fast, worldwide. We provide precision machining for a wide range of metals and engineering plastics. We have experience with over 200 materials including metals such as aluminum alloys, stainless steel, molybdenum, and titanium, and engineering plastics including PEEK, PPS, MC Nylon, and POM.

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.