6xxx · Magnesium-silicon alloy
6061 aluminium — composition, properties and extrusion notes
The general-purpose structural alloy: strong, weldable, machinable and corrosion resistant.
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) |
|---|---|---|---|---|
| T4 | 260 | 145 | 16 | 65 |
| T6 | 310 | 275 | 12 | 95 |
Typical values for extruded product. Minimum guaranteed values depend on temper and product form — the mill certificate governs.
Composition limits
| Element | Limit (%) |
|---|---|
| Si | 0.40–0.80 |
| Fe | 0.70 |
| Cu | 0.15–0.40 |
| Mn | 0.15 |
| Mg | 0.8–1.2 |
| Cr | 0.04–0.35 |
| Zn | 0.25 |
| Ti | 0.15 |
| Al | remainder |
Single figures are maxima; ranges are the permitted window.
Working with this alloy
- Density
- 2.7 g/cm³
- Common tempers
- T4, T6, T651
Physical properties
| Property | Value |
|---|---|
| Thermal conductivity | 167 W/m·K |
| Melting range | 582–652 °C |
| Electrical conductivity | 43 % IACS |
When to use it
The default choice when a part has to do several jobs at once. 6061-T6 machines far better than 6063, which is why most CNC aluminium parts start here.
Typical applications
- Structural frames and brackets
- Automotive and motorcycle components
- Machined parts and jigs
- Pressure vessels and pipelines
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.