7475 T7351 is an Al-Zn-Mg-Cu (Aluminum-Zinc-Magnesium-Copper) alloy developed for applications requiring high strength and good corrosion resistance. Its chemical composition typically consists of 5.2–6.2% Zinc, 1.9–2.6% Magnesium, 1.2–1.9% Copper, and 0.18–0.25% Chromium, with small additions of Silicon, Iron, Titanium, and Manganese. This special composition and the T7351 heat treatment provide the alloy with high strength and durability in thick components, while also offering resistance to stress-corrosion cracking.

In terms of mechanical properties, 7475 T7351 stands out with high tensile and yield strength. In the T7351 temper, the alloy provides approximately 12% elongation, balancing toughness and strength. These characteristics make it particularly suitable for large structural components in aerospace applications, such as aircraft fuselage and wing parts. Its stable performance in thick sections makes it a preferred choice among 7000 series aluminum alloys.

Regarding machinability, 7475 T7351 performs well with milling, turning, and other mechanical operations. However, due to its high alloy content, weldability is limited and there is a risk of cracking during welding. Formability is moderate; it is more suitable for thick and flat plates rather than complex geometries. Therefore, the alloy is better suited for precision machine parts and large structural components.

In terms of corrosion resistance, 7475 T7351 is highly resistant to stress-corrosion cracking, especially in the T7351 temper. It maintains stable performance even in humid and saline environments, though surface treatments or protective coatings are recommended for additional protection. Considering all these properties, 7475 T7351 is widely used in aerospace, space, and defense industries for applications requiring high strength, good hardness, and reliable corrosion resistance.