Duralumin CNC Machining For Beginners: A2017, A2024, and A7075 Explained
2025/11/6
Duralumin refers to aluminum alloys strengthened with copper (Cu) and magnesium (Mg). The most common grades are A2017 (Duralumin), A2024 (Super Duralumin), and A7075 (Ultra-Super Duralumin).
Because of their high copper content, Duralumin alloys have low corrosion resistance. When machining parts for corrosive environments, surface treatments or protective coatings are essential. Common applications include screws, aerospace equipment, gears, rivets, hydraulic components, and marine parts.
Super Duralumin (A2024)
Super Duralumin (A2024) contains more copper and magnesium than standard A2017, giving it greater strength while maintaining good machinability.
Because it has low corrosion resistance, surface treatments such as anodizing are necessary. To improve durability, a composite plate called A2024PC is used, which bonds a pure aluminum layer (A1230) to the surface.
Ultra-Super Duralumin
Ultra-Super Duralumin (A7075) is one of the strongest aluminum alloys available. It contains 1.2–2.0% copper, 2.1–2.9% magnesium, and 5.1–6.1% zinc. The addition of zinc distinguishes it from A2017 and A2024.
The name “Extra Super Duralumin” (ESD alloy) originated from earlier material development, where Duralumin (D alloy), Sander alloy (S alloy), and Zinc Duralumin (E alloy) were combined into what became known as “Extra Super Duralumin,” now commonly known as Ultra-Super Duralumin.
A7075 is valued for its steel-like strength, making it a preferred material for aircraft structures. On the Brinell hardness scale, it measures around 160 HB, compared to 58–63 HB for tool steel SKD11 and about 187 HB for stainless steels SUS303 and SUS304. While stainless steel is harder in absolute terms, A7075 delivers nearly twice the specific strength.
Like other types of Duralumin, A7075 has poor corrosion resistance and is prone to stress corrosion cracking, so careful material selection is critical. Composite versions, such as those bonded with an A7072 surface layer, improve durability.
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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.
