Aluminium balls are characterized by good corrosion and wear resistance combined with low weight. Excellent surface finish. The 6xxx series alloys, thanks to the addition of Si and Mg, are heat-treatable. They have mechanical properties slightly lower than the 2xxx and 7xxx series.
Chemical composition of 6XXX series aluminium alloy ball
| Element | type | If | Fe | Mn | Cr | Cu | Al | Mg | Zn | Ti |
|---|---|---|---|---|---|---|---|---|---|---|
| % | 6061 | 0,40-0,80 | 0,70 max | 0.15 max | 0,04-0,35 | 0,15-0,40 | balance | 0,80-1,20 | 0.25 max | 0.15 max |
Physical characteristics of 6XXX series aluminium alloy ball
| Ownership | Value | Unit |
|---|---|---|
| Density | 2.7 | g/cm3 |
| Young Module | 69 | GPA |
| Thermal expansion coefficient | 23.8 (DT=0-100°C) | × 10−6 /°C |
| Thermal conductivity | 168 | W/m·K |
| Electrical resistivity | 40 | × 10 - 9 D·m |
| Specific heat | 898 | J/kg·K |
| Relative magnetic permeability | 1,004 | — |
| Magnetic behaviour | Paramagnetic | — |
Hardness and mechanical resistance of 6XXX series aluminium alloy ball
| Ownership | Value | Unit |
|---|---|---|
| Hardness | 85-105 | HV0.5 |
| Tensile failure load | 280-340 | MPa |
| Tensile failure load | 41-49 | psix10^3 |
| Exercise temperatures | -196/200 | ° C |
| Exercise temperatures | -320,8/392 | °F |
Available diameters and grades for 6XXX series aluminium alloy ball
| Parameter | Value |
|---|---|
| Minimum diameter | 1 mm — 3/64′′′ |
| Maximum diameter | 150 mm — 6′′′ |
| Grades available | G100-200-500-1000 |
| Precision standards | ISO 3290 / AFBMA |
Corrosion resistance of 6XXX series aluminium alloy ball
Good resistance to atmospheric corrosion and in water, even in marine environments. Corrosion resistance is slightly lower than that of the 1xxx and 5xxx series alloys. Intercrystalline corrosion in aggressive environments due to the permitted copper content is reduced with appropriate thermal treatments. Subject to corrosion by stinging in the presence of chlorides.
Applications of 6XXX series aluminium alloy ball
Ball bearings, valves. Used in the automotive industry (safety devices), naval, aeronautical and aerospace sectors, electronics, in welding processes.
