7A04
7A04 belongs to the Al-Zn-Mg-Cu series super aluminum alloy, also known as super duralumin. It is quite mature among super duralumin. It has been used for a long time and is widely used. of an alloy. High strength, good heat treatment strengthening effect, medium plasticity in annealed and newly quenched states; unlike duralumin, human 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 takes 3 months.
It can reach the age hardening peak, so 7A04 is used in the quenching artificial aging state. Its disadvantages are low tissue stability and low frequency.Low fatigue strength and tendency to stress corrosion cracking. The alloy has good point properties and good machinability after gas welding heat treatment, but after annealing The machinability is poor.
Content
Chemical composition of 7A04 (%)
| Chemicai composition | |
|---|---|
| Si | 0.5 |
| Fe | 0.5 |
| Cu | 1.4-2 |
| Mn | 0.2-0.6 |
| Mg | 1.8-2.8 |
| Cr | 0.1-0.25 |
| Zn | 5.7-7 |
| Ti | 0.1 |
| other impurity（singleness） | 0.05 |
| other impurity（sum） | 0.1 |
| AL | remainder |
Physical properties of 7A04
| Aluminum alloy grades and status | 7A04-T6 |
|---|---|
| Tensile Strength Rm/Mpa | 490 |
| Yield Strength Rp0.2/Mpa | 410 |
| Elongation % | 7 |
| Hardness/HBWα | 150 |
| Density（20℃)（g/cm3） | 2.9 |
Applications of 7A04
7A04 is widely used in mold processing, mechanical equipment, tooling fixtures, aerospace industry, blow molding (mold, ultrasonic plastic elding molds, golf heads, shoe molds, paper molds, foam molds, dewaxing molds, mechanical equipment, etc.
