7A04 Aluminum Bars

Aviation super duralumin alloy, high strength, good wear resistance

7A04 belongs to the Al-Zn-Mg-Cu series of ultra-high-strength aluminum alloys, also known as super-duralumin, which is quite mature in super-duralumin. Use a longer and wider alloy. High strength, good heat treatment strengthening effect, moderate plasticity under annealing and new quenching; Different from duralumin, the corrosion resistance in the artificial aging state is better than that in the natural aging state, and the natural aging process is slow, and it takes 3 months to reach the peak of aging hardening, so 7A04 is used in the quenching artificial aging state. Its disadvantages are that the tissue stability is not high, the fatigue strength of the low frequency is low, and there is a tendency to stress corrosion and rupture. Alloy spot welding is good, gas welding is poor, and the machinability is good after heat treatment, but the machinability after annealing is not good.

Typical uses

7A04 is mainly used for the manufacture of aircraft structures and other high stress structural parts that require high strength and corrosion resistance, such as aircraft, lower wing wall panels, trusses, etc. Good plasticity after solid solution treatment, good heat treatment strengthening effect, good strength below 150 degrees, and particularly good low temperature strength, poor welding performance, stress corrosion cracking tendency. It is also widely used in mold processing, machinery and equipment, tooling fixtures, aerospace industry, blow molding (bottle) mold, ultrasonic plastic welding mold, golf head, shoe mold, paper mold, foam molding mold, wax removal mold, mechanical equipment, used to make high-end aluminum alloy bicycle frame. In 2014, it will be used for the first time as the body material of the smartphone OPPO N3.