6xxx · Magnesium-silicon alloy
6063 aluminium — composition, properties and extrusion notes
The architectural extrusion alloy — the best surface finish and the easiest to extrude.
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) |
|---|---|---|---|---|
| T5 | 150 | 110 | 12 | 60 |
| T6 | 185 | 170 | 10 | 73 |
Typical values for extruded product. Minimum guaranteed values depend on temper and product form — the mill certificate governs.
Composition limits
| Element | Limit (%) |
|---|---|
| Si | 0.20–0.60 |
| Fe | 0.35 |
| Cu | 0.10 |
| Mn | 0.10 |
| Mg | 0.45–0.90 |
| Cr | 0.10 |
| Zn | 0.10 |
| Ti | 0.10 |
| Al | remainder |
Single figures are maxima; ranges are the permitted window.
Working with this alloy
- Density
- 2.7 g/cm³
- Common tempers
- T4, T5, T6
Physical properties
| Property | Value |
|---|---|
| Thermal conductivity | 201 W/m·K |
| Melting range | 615–655 °C |
| Electrical conductivity | 53 % IACS |
When to use it
Extrudes at lower pressure than 6061, so it takes thinner walls and more intricate sections, and it anodises to the most uniform finish. Strength is moderate — use 6061 or 6082 where the part carries real load.
Typical applications
- Windows, doors and curtain walling
- Heat sinks and LED channels
- Furniture and display frames
- General fabrication profiles
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.