Aluminium balls are characterized by good corrosion and wear resistance, as well as low weight. Excellent surface finish. 7xxx series alloys are heat-treated and have the best mechanical characteristics among aluminium alloys. The balls are delivered to passivity.
Chemical composition of 7XXX series aluminium alloy ball
| Element | type | If | Fe | Mn | Cr | Cu | Ti | Al | Mg | Zn | other each | other total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % | 7A03 | 0.20 max | 0.20 max | max 0.10 | 0.05 max | 1,80-2,40 | 0,02-0,08 | balance | 1,20-1,60 | 6,00-6,70 | 0.05 max | max 0.10 |
Physical characteristics of 7XXX series aluminium alloy ball
| Ownership | Value | Unit |
|---|---|---|
| Density | 2.81 | g/cm3 |
| Young Module | 71 | GPA |
| Thermal expansion coefficient | 23.9 (DT=0-100°C) | × 10−6 /°C |
| Thermal conductivity | 156 | W/m·K |
| Electrical resistivity | 45 | × 10 - 9 D·m |
| Specific heat | 888 | J/kg·K |
| Relative magnetic permeability | 1,004 | — |
| Magnetic behaviour | Paramagnetic | — |
Hardness and mechanical resistance of 7XXX series aluminium alloy ball
| Ownership | Value | Unit |
|---|---|---|
| Hardness | 160-180 | HV |
| Tensile failure load | 450-550 | MPa |
| Tensile failure load | 66-79 | psix10^3 |
| Exercise temperatures | -196/200 | ° C |
| Exercise temperatures | -320,8/392 | °F |
Available diameters and grades for 7XXX 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 7XXX series aluminium alloy ball
The 7xxx series alloys have a slightly better corrosion resistance than the 2xxx series alloys, but lower than the 1xxx and 3xxx series. May be subject to corrosion by pitting and under loading in aggressive atmospheres.
Applications of 7XXX series aluminium alloy ball
Ball bearings, valves. Employees in the aerospace, aerospace, military and welding sectors.
