FCW 21-G
Cobalt base refill grade 21
Product description
Cobalt-based flux-cored wire offering exceptional resistance to metal-on-metal wear in corrosive environments at high temperatures. The deposited metal work-hardens to hardnesses in excess of 45 HRC. FCW 21-G is less susceptible to cracking than other cobalt-based alloys, making it ideal for use on parts subjected to repeated thermal cycling and impact.
It is recommended for hardfacing most iron- and nickel-based materials.
Used for seats and guides of large valve bodies for water and high pressure, stamping dies, pump shafts, sleeves etc…
Product application instructions
Wear resistance
Metal-Metal
Corrosion
Temperature
Impact
Abrasion
Classification
| EN 14700 | AWS A 5.21 |
|---|---|
| T Co1 | ERCCoCr-C |
Chemical analysis (%)
| C | Mn | If | Cr | Ni | Mo | Fe | Co |
|---|---|---|---|---|---|---|---|
| 0.25 | 1.0 | 1.0 | 28.5 | 3.0 | 5.5 | 4.0 | Bal. |
Mechanical characteristics
| Hardness - As welded | Hardness - Work hardened |
|---|---|
| 33 HRc | 47 HRc |
Why choose this cored wire?
- Very good resistance to soft-friction wear
FCW 21-G is slightly softer than FCW 6-G or FCW 12-G, but offers excellent resistance to metal-to-metal friction, with excellent dimensional stability.
- High toughness and low susceptibility to cracking
Thanks to its austenitic microstructure, Grade 21 is less brittle than other cobalt alloys. It absorbs mechanical shocks and vibrations more effectively, making it an excellent choice for moving parts and cyclical service.
- Good resistance to heat and thermal shock
It retains its properties up to 700-800°C, and is highly resistant to rapid temperature variations, which is essential in certain industrial applications (valves, molds, turbines, etc.).
- Exceptional resistance to chemical corrosion
FCW 21-G is renowned for its excellent resistance to acids, salt water and aggressive environments, making it an ideal choice for the chemical, petrochemical and marine industries.
