Heat-resistant Cr-Mo steels
FERVEO CMO 12WV TIG
TIG rodCatalogue only
also as: solid wire
AWS class
EN ISO 21952-A G CrMoWV12Si
EN ISO class
G/W CrMoWV12Si
Tensile strength (Rm)
700 MPa
Classification
| AWS class | EN ISO 21952-A G CrMoWV12Si |
|---|---|
| EN ISO class | G/W CrMoWV12Si |
Purpose
- TIG rod, 12% Cr martensitic steel (11% Cr–1% Mo–V–W, EN ISO G/W CrMoWV12Si) — joining and surfacing of turbine parts in 12Cr steel (X20CrMoV12-1 and equivalents), resistant to hot scaling up to 600°C.
Why it works
At 11% chromium, this alloy belongs to the 12Cr martensitic steel family used for turbines — a different family from the 9Cr-1Mo boiler ladder (FERVEO CMO 9/91). The TIG rod format gives the finest weld-pool control, useful for precision surfacing of blades and other delicate-geometry parts.
Fields of application
- Precision joining and surfacing of turbine rotors, blades, and casings in 12Cr martensitic steel.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.2 |
| V | 0.3 |
| W | 0.5 |
| Cr | 11 |
| Mn | 0.6 |
| Mo | 1 |
| Ni | 0.4 |
| Si | 0.3 |
Mechanical properties
| Tensile strength (Rm) | 700 MPa |
|---|---|
| Elongation (A5) | 15 % |
| Impact energy (KV) | 35 J |
Process
| Polarity | DC− |
|---|---|
| Shielding gas | I1 |
Sizes and part numbers
| Ø | Request |
|---|---|
| 1 mm | |
| 1.6 mm | |
| 2.4 mm | |
| 3.2 mm |
Supply programme
boxes 25 kg
Base metals
1.49221.4937
Advantages
- TIG rod format — finer weld-pool control than MIG or a covered electrode, useful for precision blade surfacing.
- Suited to both joining and surfacing worn turbine parts.
Limitations
- Not interchangeable with the 9Cr-1Mo boiler-ladder grades (FERVEO CMO 9/91) — different steel families despite the similar service temperature.