Aluminium balls are characterized by good corrosion and wear resistance, as well as low weight. Excellent surface finish. The 2xxx series alloys provide better mechanical features. The balls are delivered to passivity.
Chemical composition of the aluminium alloy ball series 2XXX
| Element | type | If | Fe | Mn | Cr | Cu | Ti | Al | Mg | Zn |
|---|---|---|---|---|---|---|---|---|---|---|
| % | 2017 | 0,20-0,80 | 0,70 max | 0,40-1,00 | max 0.10 | 3,50-4,50 | 0.15 max | balance | 0,40-0,80 | 0.25 max |
Physical characteristics of the aluminium alloy ball series 2XXX
| Ownership | Value | Unit |
|---|---|---|
| Density | 2.78 | g/cm3 |
| Young Module | 73 | GPA |
| Thermal expansion coefficient | 22.9 (DT=0-100°C) | × 10−6 /°C |
| Thermal conductivity | 136 | W/m·K |
| Electrical resistivity | 43 | × 10 - 9 D·m |
| Specific heat | 795 | J/kg·K |
| Relative magnetic permeability | 1,004 | — |
| Magnetic behaviour | Paramagnetic | — |
Hardness and mechanical strength of 2XXX series aluminium alloy ball
| Ownership | Value | Unit |
|---|---|---|
| Hardness | 125-185 | HV |
| Tensile failure load | 400-500 | MPa |
| Tensile failure load | 58-72 | psix10^3 |
| Exercise temperatures | -196/200 | ° C |
| Exercise temperatures | -320,8/392 | °F |
Available diameters and grades for aluminium alloy ball 2XXX series
| Parameter | Value |
|---|---|
| Minimum diameter | 0.8 mm — 1/32′′′ |
| Maximum diameter | 150 mm — 6′′′ |
| Grades available | G100-200-500-1000 |
| Precision standards | ISO 3290 / AFBMA |
Corrosion resistance of aluminium alloy ball series 2XXX
The 2xxx series alloys are less resistant than those of the 1xxx series due to the presence of copper, a possible starting element of galvanic cells. Subject to corrosion in industrial and marine atmosphere. All aluminium alloys may be subject to pitting corrosion in the presence of chlorides.
Applications of aluminium alloy ball series 2XXX
Ball bearings, valves. Use as a closing element of an orifice (flattened ball). Employees in the automotive industry (safety devices), aeronautics and aerospace, electronics, welding processes.
