Designation
- Grade
- CW-12MW
- UNS
- N30002
- Standard
- ASTM A494/A494M
- Family
- Nickel-based alloys
- Density
- ≈ 8.90 g/cm³
- Usual delivery condition
- Solution annealed and quenched
Chemical composition
| Element | Mass fraction, % |
|---|---|
| C | ≤ 0.12 |
| Mn | ≤ 1.00 |
| Si | ≤ 1.00 |
| Cr | 15.5–17.5 |
| Mo | 16.0–18.0 |
| W | 3.75–5.25 |
| Fe | 4.5–7.5 |
| V | 0.20–0.40 |
| 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 | 495 | 275 | 4 |
Minimum values (or ranges) for separately cast test bars as specified in ASTM A494/A494M.
Characteristics
- Corrosion and oxidation behaviour
- Selected for acids and aggressive chemical process media
- Weldability
- Possible with qualified procedure; preheat and/or post-weld heat treatment as specified
- Machinability
- Difficult; rigid set-ups, low cutting speeds or grinding
- Typical applications
- Valves Pumps Chemical processing
International cross-reference
| System | Designation | Relationship |
|---|---|---|
| EN / W.-Nr. | 2.4686 (G-NiMo17Cr) | Comparable properties |
| UNS (wrought) | N10276 (Alloy C-276) | Functional alternative |
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.