When it comes to structural metal fabrication, perhaps only one metal gets anywhere near the attention given to steel, and that is aluminium. It’s roughly a third of the weight of steel while still having exceptional mechanical properties. However, not all aluminium grades are created equal, so it is critical to understand the differences among aluminium alloy grades during the material selection process. Two of the most popular aluminium alloy grades for structural applications are 6082 and 7075. While similar in some ways, there are also large differences worth noting.
The main differences between 6082 and 7075 aluminium are the following attributes:
Alloy Series & Chemical Composition
Both 6082 and 7075 are heat-treatable, therefore, in order to make a direct comparison of the two, they must be evaluated under the same type of heat treatment. When looking at both alloys in the -T6 condition (meaning solution heat-treated then artificially aged), several noticeable differences are observed. First off is that the tensile strength of 7075-T6 is nearly double that of 6082-T6. The shear strength of 7075-T6 is roughly 1.5 times that of 6082-T6. 6082-T6 is quite soft when compared with 7075-T6 as well.