EN AW-7021 · AlZn5.5Mg1.5
A copper-free Zn-Mg alloy a step stronger than 7020, sharing its good weldability and natural re-aging — used where welded strength matters more than peak hardness.
Material Data
Composition and physical properties
| Element | Limit / range |
|---|---|
| Si | ≤ 0.25 |
| Fe | ≤ 0.40 |
| Cu | ≤ 0.25 |
| Mn | ≤ 0.10 |
| Mg | 1.2 – 1.8 |
| Zn | 5.0 – 6.0 |
| Zr | 0.08 – 0.18 |
| Al | balance |
Limits per EN 573-3 / applicable registration. The governing specification on your order prevails.
| Property | Value |
|---|---|
| Density | 2.78 g/cm³ |
| Melting range | 600 – 645 °C |
| Thermal expansion (20–100 °C) | 23.5 µm/m·K |
| Elastic modulus | 70 GPa |
| Thermal conductivity | 140 W/m·K |
| Electrical conductivity | 36 % IACS |
Strength Data
Mechanical properties by temper
Typical room-temperature values for orientation. Design minimums depend on product form, thickness and the governing specification — request the applicable table with your inquiry.
| Temper | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| T6 | 320 | 400 | 10 | 110 |
Designations & Standards
How this alloy appears on drawings
| System | Designation |
|---|---|
| ISO / EN designation | AlZn5.5Mg1.5 |
| EN numeric | EN AW-7021 |
| UNS | A97021 |
| Werkstoff-Nr. | — |
| Common product standards | ASTM B209 · EN 573-3 |
Supply Program
Available from Lipol as
| Product form | Standard | Alloy | Temper | Category |
|---|---|---|---|---|
| Plate | ASTM B209 | 7021 | T6 | Aerospace & Defense |
Additional tempers, forms and specifications available on request — the table shows the standard program.
Applications
Where EN AW-7021 is the right answer
- Welded structural plate
- Transport and lifting equipment
- Sporting goods
Specifying EN AW-7021?
State the temper, product form, dimensions and governing standard from the tables above, and we will confirm availability with a firm price and delivery date — typically within one business day.
Request a QuoteMaterial Engineering
Not sure EN AW-7021 is the right alloy?
Describe the application — load, environment, joining, finishing — and our engineers will confirm the choice or propose a better-value alternative.