Designation
- Grade
- CU5MCuC
- UNS
- N08826
- EN designation
- —
- Commonly associated designations
- Incoloy® 825 type
Type designations and trade names are given for orientation only. Trade names are trademarks of their respective owners; the cast grade and its standard remain the specification. - 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 | ≤ 0.050 |
| Mn | ≤ 1.0 |
| Si | ≤ 1.0 |
| Cr | 19.5–23.5 |
| Ni | 38.0–44.0 |
| Mo | 2.5–3.5 |
| Cu | 1.5–3.5 |
| Nb | 0.60–1.20 |
| Fe | 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 | 520 | 240 | 20 |
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) | N08825 | 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 TR delivery specification.
Other grades in this family
CW-12MW CW-2M CX2MW CW-6M N-7M CW-6MC M-35-1 CY-40 CZ-100 Alloy 718