Aluminium Extrusion Alloy Selection Guide


Selection of the most suitable aluminium alloy will be dictated by several factors such as:

  • How it will be used
  • Machining requirements
  • Surface finish and overall finish
  • Operating conditions including environment, loading etc

Aluminium Extrusion Alloys

The following section provide brief descriptions of some extrudable aluminium alloys that Metalweb supply.

Aluminium 1050/1200

Aluminium 1050 and 1200 are soft workable alloys that exhibit excellent resistance to corrosion.

Aluminium 2014

Aluminium 2014 can be readily machined and large amounts of material can be removed in a single pass to produce a surface finish similar to aluminium 6082. Machining is easier in the solution heat treated state as compared to the fully heat treated state. Its durability is lower however, and it is recommended that a surface coating be applied to ensure a long service life. 2014 is the most common aerospace aluminium extrusion alloy.

Aluminium 3003/3103

These aluminium alloys contain 1% magnesium and are generally stocked in solid bar rather then extruded sections and profiles. Aluminium 3003 and 3103 are suited to welding and operation in cryogenic conditions.

Aluminium 5056A/5083/5251

These 5000 series aluminium alloys contain magnesium as the primary alloying element. They are ductile in the soft condition but readily work harden. They are suited to marine and transport applications possessing good corrosion resistance to marine environments as well as good weldability. They are harder to extrude to produce hollow shapes which can require longer lead times and higher prices.

Aluminium 6061

This is a standard structural alloy that can be easily joined by welding or brazing and possesses good corrosion resistance. It can be used to produce parts with a fine finish. It is similar to aluminium 6082 but had improved formability, but is harder to extrude and has lower strength. It is typically used for coupling, hardware, hydraulic pistons etc.

Aluminium 6063

Aluminium 6063 is a low to medium strength aluminium alloy, but can be used to create more complex shapes and sections. It exhibits good corrosion resistance and a high surface finish and can be anodised to produce different surface finishes. It is the most common alloy for stock shapes and is typically used in transport and architecture.

Aluminium 6082

This is the most versatile of the medium strength aluminium alloys. Aluminium 6082 exhibits good mechanical properties, corrosion resistance, weldability and machinability and is commonly available in rod and bar stock.

Aluminium 7075

Aluminium 7075 is the highest strength bar typically stocked. When machined it produces curled or easily broken chips but results in a good surface finish. It displays high hardness and strength but poor weldability and corrosion resistance. It in commonly used in the aerospace industry and typically available in rounds and rectangles.

About Metalweb

Metalweb is a leading UK aluminium stockholder and aims to provide a 100% on-time delivery and quality product both for day-to-day requirements and long term contracts. They have one of the largest ranges of aluminium products in all alloys (including plate, sheet, bar, tube and other extruded products) carried in stock.

Source: Metalweb

For more information on this source, please visit Metalweb.

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