Designation
- Grade
- CF8C
- UNS
- J92710
- EN designation
- ≈ 1.4552 (GX5CrNiNb19-11)
- Commonly associated designations
- 347 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 A351/A351M, A743/A743M
- Density
- ≈ 7.75 g/cm³
- Usual delivery condition
- Solution annealed and quenched
Chemical composition
| Element | Mass fraction, % |
|---|---|
| C | ≤ 0.08 |
| Mn | ≤ 1.50 |
| Si | ≤ 2.00 |
| Cr | 18.0–21.0 |
| Ni | 9.0–12.0 |
| Nb | 8 × C – 1.00 |
| 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 | 485 | 205 | 30 |
Minimum values (or ranges) for separately cast test bars as specified in ASTM A351/A351M, A743/A743M.
Characteristics
- Corrosion and oxidation behaviour
- Good general corrosion resistance
- Weldability
- Good with matching filler and standard procedures
- Machinability
- Moderate; work hardening or built-up edge to be considered
- Typical applications
- Valves Pumps Food processing Chemical processing General engineering
International cross-reference
| System | Designation | Relationship |
|---|---|---|
| EN | 1.4552 (GX5CrNiNb19-11), EN 10283 | Similar composition |
| AISI | 347 (wrought) | Comparable properties |
Casting and processing considerations
Castings are normally solution annealed and rapidly cooled to dissolve carbides and restore corrosion resistance. Low-carbon grades are preferred where castings will be welded without subsequent heat treatment. High shrinkage requires adequate feeding of heavy sections; surface finish and pickling or passivation requirements should be agreed in advance.
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
CF8 GX5CrNi19-10 (1.4308) CF3 GX2CrNi19-11 (1.4309) CF8M GX5CrNiMo19-11-2 (1.4408) CF3M GX2CrNiMo19-11-2 (1.4409) CG8M CN7M CK3MCuN CN3MN GX2NiCrMoCu25-20-5 (1.4584)