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 generally includes 5.2–6.2% Zinc, 1.9–2.6% Magnesium, 1.2–1.9% Copper, and 0.18–0.25% Chromium; small amounts of Silicon, Iron, Titanium, and Manganese are also present. This special composition and the T7351 heat treatment condition give the alloy high strength and durability in thick sections while enhancing resistance to stress corrosion cracking.

Mechanically, 7475 T7351 stands out with high tensile and yield strength. In the T7351 temper condition, the alloy provides about 12% elongation at break, offering a balance of high toughness and strength. These properties make the alloy particularly suitable for large structural components in the aerospace and aviation industries, such as aircraft fuselage and wing parts. Its stable performance in thick sections makes it a preferred choice among 7000 series aluminum alloys.

In terms of machinability, 7475 T7351 performs well in 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, flat plates rather than complex geometries. Therefore, the alloy is more suitable for precision-machined parts and large structural components.

Regarding corrosion resistance, 7475 T7351, especially in the T7351 temper condition, shows high resistance to stress corrosion cracking. It performs reliably even in humid and salty environments; however, the use of protective surface treatments or coatings is recommended. Considering all these properties, 7475 T7351 is widely preferred in the aerospace, aviation, and defense industries for applications requiring high strength, good toughness, and reliable corrosion resistance.