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Aluminium 5251 vs 6082T – What’s the Difference

Aluminium 5251 vs 6082T

If you are looking for a lightweight, durable, and versatile material, Aluminium is always a top choice. Nevertheless, it’s important to understand the different types of Aluminium available in the market. Two of the popular types are Aluminium 5251 and 6082T. In this blog post, we will discuss the differences between these two types so you can decide which one best suits your needs.

Difference Between Aluminium 5251 and 6082T

Composition and Properties

Aluminium 5251 and 6082T have different alloy compositions and properties. 5251 is an alloy with a magnesium content of 2.2-2.8%, while 6082T has a magnesium content of 0.6-1.2%. This difference in magnesium content gives 5251 higher corrosion resistance than 6082T. Additionally, 6082T has higher tensile strength and good machinability, making it ideal for structural applications such as bridges and buildings.


Welding is an important consideration when choosing Aluminium. Both 5251 and 6082T can be welded, but 6082T has better weldability due to its lower magnesium content. 5251, conversely, can be prone to cracking during the welding process and requires extra care.

Surface finish and Anodizing

5251 and 6082T have a good surface finish and can be easily anodized. However, 5251 has a matte finish, while 6082T has a shiny finish. If you require a matte finish, then 5251 is the better choice.

Availability and Cost

The availability and cost of Aluminium 5251 and 6082T may differ depending on your location and supplier. In some countries, 5251 may be more readily available and cost less than 6082T. However, 6082T may be more common and economical in other areas. It is best to consult your supplier to determine which alloy suits your application.


In summary, Aluminium 5251 and 6082T are excellent materials with unique strengths and properties. Choosing between them will depend entirely on your specific requirements and budget. While 5251 offers better corrosion resistance and a matte finish, 6082T offers better tensile strength and weldability. Understanding these differences will help you make an informed decision that will ultimately result in the success of your project. Always work with a trusted and experienced Aluminium supplier regardless of your choice.

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