Designation
- Grade
- CW-6MC
- UNS
- N26625
- Standard
- ASTM A494/A494M
- Family
- Nickel-based alloys
- Density
- ≈ 8.44 g/cm³
- Usual delivery condition
- Solution annealed and quenched
Chemical composition
| Element | Mass fraction, % |
|---|---|
| C | ≤ 0.06 |
| Mn | ≤ 1.00 |
| Si | ≤ 1.00 |
| Cr | 20.0–23.0 |
| Mo | 8.0–10.0 |
| Nb | 3.15–4.50 |
| Fe | ≤ 5.0 |
| Ni | bal. |
Main elements only. Phosphorus, sulphur and residual-element limits are specified in the standard and are not reproduced here.
Mechanical properties
| Condition | Tensile strength Rm, min. (MPa) | Yield strength Rp0.2, min. (MPa) | Elongation, min. (%) |
|---|---|---|---|
| Solution annealed and quenched | 485 | 275 | 25 |
Minimum values (or ranges) for separately cast test bars as specified in ASTM A494/A494M.
Characteristics
- Corrosion and oxidation behaviour
- Very good resistance in seawater and chloride-bearing media
- Weldability
- Good with matching filler and standard procedures
- Machinability
- Difficult; rigid set-ups, low cutting speeds or grinding
- Typical applications
- Valves Pumps Marine Offshore Chemical processing
International cross-reference
| System | Designation | Relationship |
|---|---|---|
| UNS (wrought) | N06625 (Alloy 625) | Comparable properties |
Casting and processing considerations
Melting practice has a strong influence on quality: reactive elements such as aluminium and titanium in superalloys normally require vacuum melting and pouring, while corrosion-resistant grades are commonly air melted with careful control of carbon and silicon. Corrosion-resistant grades are solution annealed; weld repair and its heat treatment must follow the material specification.
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.