Aluminium alloy 6061 is a medium to high strength heat-treatable alloy and the most widely used of the 6000 series. It combines good mechanical strength with excellent corrosion resistance, very good weldability and good machinability, which is why it appears in everything from structural work to marine fittings. Magnesium and silicon are its principal alloying elements. 6061-T6 is solution heat treated and then artificially aged. The closely related T651 temper adds stress relief by stretching, which lowers residual stress and gives a flatter, more stable plate for heavy machining; both tempers share the same specified strength minima. Where higher strength is needed in the same series, alloy 6082 has largely superseded 6061 in structural applications.
| Element | Composition % |
|---|---|
| Silicon (Si) | 0.40 - 0.8 |
| Iron (Fe) | 0.7 Max |
| Copper (Cu) | 0.15 - 0.40 |
| Manganese (Mn) | 0.15 Max |
| Magnesium (Mg) | 0.8 - 1.2 |
| Chromium (Cr) | 0.04 - 0.35 |
| Zinc (Zn) | 0.25 Max |
| Titanium (Ti) | 0.15 Max |
| Other (Each) | 0.05 Max |
| Others (Total) | 0.15 Max |
| Aluminium (Al) | Remainder |
| Thickness (mm) | Tensile Strength Rm (MPa) | Proof Stress Rp0,2 (MPa min) | Elongation A50 (% min) | Hardness HBW |
|---|---|---|---|---|
| 0.4 – 1.5 | 290 min | 240 | 6 | 88 |
| over 1.5 – 3.0 | 290 min | 240 | 7 | 88 |
| over 3.0 – 6.0 | 290 min | 240 | 10 | 88 |
| Mechanical properties are those specified by EN 485-2:2016 for alloy 6061 in T6 temper — solution heat treated and artificially aged — for the sheet thicknesses we stock. Hardness is given in the standard for information only and is not a guaranteed minimum. Certificates to EN 10204-3.1 are available on request. | ||||
| Property | Value |
|---|---|
| Density | 2.70 g/cm3 |
| Melting Point | 582°C |
| Thermal Expansion | 23.6 ×10−6 /K |
| Modulus of Elasticity | 69 GPa |
| Thermal Conductivity | 167 W/m.K |
| Electrical Resistivity | 0.040 ×10−6Ω.m |
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