7xxx · Zinc alloy
7075 aluminium — composition, properties and extrusion notes
The highest-strength aluminium in common use — aerospace grade.
How it compares
Relative to the other grades we extrude. This is a selection aid, not a specification.
Mechanical properties
| Temper | Tensile (MPa) | Yield (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| T6 | 540 | 470 | 11 | 150 |
| T73 | 505 | 435 | 13 | 135 |
Typical values for extruded product. Minimum guaranteed values depend on temper and product form — the mill certificate governs.
Composition limits
| Element | Limit (%) |
|---|---|
| Si | 0.40 |
| Fe | 0.50 |
| Cu | 1.2–2.0 |
| Mn | 0.30 |
| Mg | 2.1–2.9 |
| Cr | 0.18–0.28 |
| Zn | 5.1–6.1 |
| Ti | 0.20 |
| Al | remainder |
Single figures are maxima; ranges are the permitted window.
Working with this alloy
- Density
- 2.81 g/cm³
- Common tempers
- T6, T651, T73
Physical properties
| Property | Value |
|---|---|
| Thermal conductivity | 130 W/m·K |
| Melting range | 477–635 °C |
| Electrical conductivity | 33 % IACS |
When to use it
Roughly three times the yield strength of 6063, but it is not weldable by conventional fusion processes, has poorer corrosion resistance and is the hardest of these grades to extrude. Use it only where the strength is genuinely needed.
Typical applications
- Aerospace structures and fittings
- Moulds and tooling
- High-stress machine components
- Competition cycling and motorsport
Other alloys
1060
99.6% pure aluminium for conductivity, ductility and chemical resistance.
1100
99.0% pure aluminium — the workhorse of the commercially pure grades.
3003
Manganese-bearing alloy — about 20% stronger than 1100 with similar workability.
5052
The strongest common non-heat-treatable sheet alloy, and the marine standard.
6005A
A stronger structural alternative to 6063, developed for extruded transport profiles.