Heat-resistant Cr-Mo steels
FERVEO CMO 2 TIG
TIG rodCatalogue only
also as: solid wireflux-cored wire (FCW)
AWS class
EN ISO 21952-A G CrMo2Si
EN ISO class
G/W CrMo2Si
Tensile strength (Rm)
550–650 MPa
Classification
| AWS class | EN ISO 21952-A G CrMo2Si |
|---|---|
| EN ISO class | G/W CrMo2Si |
Purpose
- TIG Cr-Mo rod (2.7% Cr–1% Mo, EN ISO G/W CrMo2Si) — TIG welding of heat-resistant Cr-Mo steels up to 600°C, for P22-grade piping and boilers.
Why it works
More chromium than the FERVEO CMO 1 family (2.7% versus 1.2%) steps up creep and hot-oxidation resistance — the same alloying principle as the FERVEO CMO 2B HD P2/2B HD P2 15 electrodes, here in rod form for the TIG process's tighter weld-pool control.
Fields of application
- P22-grade Cr-Mo steel piping and boilers, continuous service up to 600°C, especially high-responsibility root passes.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.05 |
| Cr | 2.7 |
| Mn | 1 |
| Mo | 1 |
| Si | 0.6 |
Mechanical properties
| Tensile strength (Rm) | 550–650 MPa |
|---|---|
| Yield strength (Rp0.2) | 450 MPa |
| Elongation (A5) | 18 % |
| Impact energy (KV) | 90 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
1.72591.72731.72761.72811.73801.8075
Advantages
- TIG rod format — tighter weld-pool and heat-input control than a covered electrode, useful on pipe root passes.
- Same Cr-Mo alloy grade (P22) as the FERVEO CMO 2B HD P2/2B HD P2 15 electrodes — consistent in-service behavior across processes.
Limitations
- For higher temperature or pressure duty, see the higher steps of the FERVEO CMO family (5/9/91).