7A04 T6 T651 aluminum extruded bar belongs to the Al-Zn-Mg-Cu series of ultra-high-strength aluminum alloys, also known as super-duralumin, which is an alloy that wants to be mature. It is used for a long time and is widely used. High strength, good heat treatment strengthening effect, moderate plasticity in annealing and newly quenched states; different from duralumin, the corrosion resistance in artificial aging state is better than that in natural aging state, and the natural aging process is slower, and it needs to go through 3 The peak of age hardening can only be reached after months, so 7A04 is used in the quenched artificial aging state. Its disadvantage is that the stability of the organization is not high, the low frequency fatigue strength is low, and there is a tendency to stress corrosion cracking. Alloy spot welding has good weldability, poor gas welding, good machinability after heat treatment, but poor machinability after annealing.
7A04 T6 T651 aluminum extruded bar is widely used in aircraft skins, screws, and stressed structures such as girder stringers, bulkheads, wing ribs, landing gears and other aerospace, military equipment, chemical and other fields.
| Chonioal composition | |||||||||||||
| Alloy | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Others | AL | |||
| every | tol | ||||||||||||
| 7A04 | 0.5 | 0.5 | 1.4-2.0 | 0.2-0.6 | 1.8-2.8 | 0.1-0.25 | 5.0-7.0 | 0.1 | 0.05 | 0.1 | |||
| Mechanical properties | |||||||||||||
|
Aluminium alloy & temper |
Rm/Mpa Tensile Strength |
Rp0.2/Mpa Proof Strength |
A/% Percentage elongation after fracture |
HB Hardness |
|||||||||
| 7A04-T6/T651 | 490 | 410 | 4 | 150 | |||||||||
