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EN AW-7020 · AlZn4.5Mg1

The weldable 7000: a copper-free composition that re-ages naturally after welding, recovering most of its strength in the heat-affected zone without post-weld treatment — unique among high-strength aluminums.

2.78g/cm³
Density
370MPa
Typical tensile strength (T6)
70GPa
Elastic modulus
7000
Series — Al-Zn maximum strength

Material Data

Composition and physical properties

Chemical composition (% by mass)
ElementLimit / range
Si≤ 0.35
Fe≤ 0.40
Cu≤ 0.20
Mn0.05 – 0.50
Mg1.0 – 1.4
Zn4.0 – 5.0
Cr0.10 – 0.35
Zr0.08 – 0.20
Albalance

Limits per EN 573-3 / applicable registration. The governing specification on your order prevails.

Physical properties (typical, room temperature)
PropertyValue
Density2.78 g/cm³
Melting range604 – 645 °C
Thermal expansion (20–100 °C)23.3 µm/m·K
Elastic modulus70 GPa
Thermal conductivity140 W/m·K
Electrical conductivity36 % 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.

Typical mechanical properties — EN AW-7020 (AlZn4.5Mg1)
TemperYield strength (MPa)Tensile strength (MPa)Elongation (%)Hardness (HB)
T42103201490
T629037012105
T73512703401295

Designations & Standards

How this alloy appears on drawings

Cross-reference designations
SystemDesignation
ISO / EN designationAlZn4.5Mg1
EN numericEN AW-7020
UNSA97020
Werkstoff-Nr.3.4335
Common product standardsASTM B209, B221, B241 · EN 485 / EN 755 · WNr 3.4335

Supply Program

Available from Lipol as

Catalog entries for EN AW-7020
Product formStandardAlloyTemperCategory
PlateASTM B2097020T7351Aerospace & Defense
Bar / FlatASTM B2417020T6Aerospace & Defense
Tube / Profile / ExtrusionASTM B2217020T4Aerospace & Defense

Additional tempers, forms and specifications available on request — the table shows the standard program.

Applications

Where EN AW-7020 is the right answer

  • Welded military bridges and vehicles
  • Bicycle frames
  • Crane and gantry structures
  • Armor and ballistic panels

Specifying EN AW-7020?

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.

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Material Engineering

Not sure EN AW-7020 is the right alloy?

Describe the application — load, environment, joining, finishing — and our engineers will confirm the choice or propose a better-value alternative.

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