Aluminum alloys
7020
Spécifications
EU
Al Zn4,5Mg1
USA
UNS: A97020
ISO Symbol
Al Zn4,5Mg1
Composition
Cr
0.22
Mn
0.25
Al
Base
Mg
1.20
Zn
4.5
Applications
• Closed-die forgings and forged bars for nuclear, space and defence industries.
Characteristics
• Good weldability.
• Average mechanical strength.
• Good balance between toughness and stress corrosion resistance.
• This alloy is similar to Grade 7005.
Mechanical properties
Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
---|---|---|---|
T 6 condition thickness < 100 mm | > 350 | > 280 | > 10 |
T 652 condition thickness 100/200 mm | > 340 | > 275 | > 10 |
Key to heat treatment symbols
Solution treated | H | Annealed | R |
---|---|---|---|
Thermo-mechanical treatment | TM | Quenched and tempered | T+RV |
Sub-zero treatment | F | Solution treated and aged | H+V |