Cobalt is used in applications requiring extreme wear and temperature particularly where lubrication is marginal. Cobalt is highly resistant to corrosion. Please note that larger Cobalt alloy balls (1.5” and up) will have a lower hardness than smaller balls.
Material Analysis
| Carbon | 2.2/2.7% |
| Manganese | 1.00% max. |
| Silicon | 1.00% max. |
| Tungsten | 16/19% |
| Chromium | 31/34% |
| Iron | 3.00% max. |
| Nickel | 2.50% max. |
| Other | 2.00% max. |
| Molybdenum | ———– |
| Beryllium | ———– |
| Cobalt | Balance |
Mechanical Properties
| Tensile strength | 40 Kpsi |
| Yield strength | 60 Kpsi |
| Elongation | Nil |
| Rockwell Hardness | Rc 55-59 min. |
| Density | 0.317 lbs/cubic inch |