Description
Co25 is resistant to oxidation and carburization up to 1900 ºF. The alloy resists wet chlorine at ambient temperatures and is resistant to nitric and hydrochloric acids under certain conditions. Exposure testing is recommended to verify performance.
Co25 forms a protective oxide film during hot metal-on-metal wear which prevents metal transfer and damage due to adhesion. The alloy is resistant to thermal cracking and surface fatigue. Since the microstructure is relatively free of carbide reinforcement, it is not recommended for low stress or low angle particle erosion service.
Carbide tools allow a variety of conventional machining operations. Use positive rake angle to avoid burnishing since the alloy work hardens readily. Sharp tools and coolant are recommended for drilling.
Chemical & Physical Properties
| Co | Cr | W | C | Ni | Mo | Others | Hardness | Density | Melting Range |
| Bal. | 20 | 15 | 0.1 | 10 | < 1.0 | Fe, Si, Mn | 20 – 45 HRC | 8.31 g/cm3 | 1329 – 1410 ºC |
Deposit Characteristics
| Magnetic | No |
| Deposit Layers | 2 Max |
| Thermal Conductivity | 65 Btu-in/hr/ft2/°F |
| Electrical Resistivity | 34.9 µ-ohm.cm |
Applications
- Piercing points
- Forming tools
- Extrusion dies
- Furnace hardware
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