When it comes to aluminum, 6061 may be used the most, but it’s not the answer to the question of which aluminum is strongest. That distinguished honor goes to 7075. Look no further than the fact the aerospace industry uses 7075 aluminum for structural components. With that in mind, it’s a good bet that it will hold up to the strength test of your application, too.

Let's check the numbers

Part of the 7000 series of aluminum, 7075 contains zinc as its major alloying element. When coupled with a small percentage of magnesium, the result is a heat-treatable alloy with very high strength. Like other grades in the 7000 series of aluminum, 7075 aluminum uses small quantities of copper and chromium as well. This grade conforms to AMS QQ-A-225/9 and ASTM B211.

Various methods of cold working are typically used to reduce the internal residual stress resulting from prior heat treatment. Stretcher level and compressing are two of common cold-working methods used on 7075 aluminum.

What are the differences between 7075 aluminum and 6061 aluminum?

6061, one of the most used aluminum grades in the world, contains magnesium (1.0%) and silicon (0.6%) as its primary alloying elements.

Strength is the primary difference between 6061 and 7075 aluminum.

6061 aluminum is highly resistant to corrosion, whereas 7075 aluminum is a bit more susceptible to corrosion due in part to its copper elements.

Can aluminum 7075 be cast?

In some cases, as-cast 7075 aluminum alloy is directly used as billet in hot-working methods like extrusion. However, as-cast 7075 aluminum alloy can be highly sensitive to deformation temperature and strain rate and can be susceptible to cracking during hot plastic deformation. Therefore, it is important to seek professional advice before casting.

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Check out our inventory of 7075 aluminum round bar.

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