Cobalt (Stellite)
FERVEO COB 1
covered electrode · stick electrodeCatalogue only
also as: TIG rodflux-cored wire (FCW)
AWS class
E CoCr C/E 20-UM-55 CTZ
EN ISO class
E Co 3
Hardness
48–52 HRC
Classification
| AWS class | E CoCr C/E 20-UM-55 CTZ |
|---|---|
| EN ISO class | E Co 3 |
| DIN 8555 / EN 14700 | E 20-UM-50 CTZ |
Purpose
- The highest-alloyed Co-Cr-W cobalt hardfacing electrode in the family (AWS E CoCr-C, EN ISO E Co 3), 50–57 HRC — for valve and fitting seats and surfaces under high temperature, pressure, corrosion, and metal-to-metal sliding.
Why it works
The highest carbon and tungsten content in the whole FERVEO COB family (2.1% C · 13% W) gives the highest density of hard carbides — maximum hardness and abrasion resistance, but the most brittle deposit in the family.
Fields of application
- Hardfacing valve and fitting seats and surfaces exposed to high temperature, pressure, and corrosion.
- Cutting tools, screw conveyors, wear rings, and guide rails subject to metal-to-metal sliding.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 1.4 |
| W | 8 |
| Co | balance |
| Cr | 29 |
Mechanical properties
| Hardness | 48–52 HRC |
|---|
Process
| Polarity | DC+/AC |
|---|
Sizes and part numbers
| Ø | Length | Current | Packaging | Request |
|---|---|---|---|---|
| 3.2 mm | 350 mm | 90–120 A | 5 kg | |
| 4 mm | 350 mm | 130–160 A | 5 kg |
Cross-reference
| Replaces EH 801 (Magmaweld) | Direct replacement |
| Replaces Stoodite 1 (Stoody) | Direct replacement |
Equivalence refers to the classification (AWS / EN ISO), not to product identity. In applications with a qualified procedure (WPS), validate the substitution before use.
Advantages
- The highest hardness and abrasion resistance in the FERVEO COB family.
- Good resistance to temperature, pressure, and corrosion in service — manufacturer-validated for valves and fittings.
Limitations
- The most brittle in the FERVEO COB family — higher cracking risk than COB 6/COB 12; requires preheating and controlled cooling, especially on rigid or thick-section parts.
- As with any cobalt-based hardfacing, the first pass dilutes with the base metal — full hardness and resistance are only reached from the second layer on.