7022 aluminium alloy is an alloy in the wrought aluminium-zinc family (7000 or 7xxx series). It is one of the more complex grades in the 7000 series, with at least 87.85% aluminium by weight.

Like most other highly alloyed alloys, 7022 is a high strength alloy, with yield strength of 370 MPa. Designed to be resistant to stress corrosion cracking, it has decent corrosion and oxidation resistance comparable to 7075 aluminium alloy[1] but worse than 7039 aluminium alloy. Good machinability, thermal conductivity and dimensional stability make 7022 alloy a material of choice for plastic injection molds.[2]

7022 alloy can be heat treated to increase tensile strength in expense of workability, with most common grade been T651.

Notes: Alternative names for 7022 alloy are A7022 and AA7022.

Chemical Composition

1. Aluminium: 88.35 to 92.4%

2. Zinc: 4.3 to 5.2%

3. Magnesium: 2.6 to 3.7%

4. Copper: 0.5 to 1.0%

5. Manganese: 0.1 to 0.4%

6. Chromium: 0.1 to 0.3%

7. Silicon: 0.5% max

8. Iron: 0.5% max[3]

9. Titanium: 0.2% max

10. Zirconium: 0.2% max

11. Other: 0.15% max

Features

very low corrosion resistance

suitable for protective anodizing and coating

not solderable

not weldable, except resistance welding

not suitable for cold forming