Designation
- Grade
- Co-Cr-W Alloy 6
- UNS
- R30006
- Standard
- Nominal composition; supplier and AMS specifications vary
- Family
- Cobalt-based alloys
- Density
- ≈ 8.44 g/cm³
- Usual delivery condition
- As cast
Chemical composition
| Element | Mass fraction, % |
|---|---|
| Cr | 27–32 |
| W | 4–6 |
| C | 0.9–1.4 |
| Ni | ≤ 3 |
| Fe | ≤ 3 |
| Si | ≤ 2 |
| Co | bal. |
Main elements only. Phosphorus, sulphur and residual-element limits are specified in the standard and are not reproduced here.
Mechanical properties
Mechanical properties depend on the heat-treatment condition and the ordering specification and are therefore not listed as single values. They are agreed per project.
Characteristics
- Corrosion and oxidation behaviour
- Good general corrosion resistance
- Weldability
- Limited; crack-sensitive, welding only by agreement
- Machinability
- Difficult; rigid set-ups, low cutting speeds or grinding
- Typical applications
- Wear parts Valves Pumps High-temperature service
International cross-reference
Casting and processing considerations
Design the casting so that functional surfaces need grinding only. Carbide-containing wear grades have limited ductility and are sensitive to thermal shock during cooling and finishing. Where a specification for implant alloys is referenced, its additional requirements for melting, testing and documentation apply in full and must be agreed explicitly.
Reference data compiled from the cited standards for orientation. Always work from the current edition of the governing specification; values are not a guaranteed LOSTWAX delivery specification.