Corstel 21A
“Grade 21” type base cobalt hardfacing electrode
Description & applications
Hardfacing electrode with a rutile-basic coating. Cobalt base deposit of « stellite grade 21 » type (Co-Cr-Mo-Ni). Deposit characterized by a good metal-metal wear up to 1000°C, even in presence of sulphurous atmosphere- Good behaviour to important thermal and mechanical shocks- Excellent resistance to cracks-Highly resistant to cavitation and erosion- Deposit non magnetic.
Surfacing of motor valves, gas turbine blades, extrusion dies, forging dies, forging tools, mixers, and valves for gas/water/vapour/acids.
*Note: "Stellite" is a trade mark of Deloro Stellite (Haynes International).
Classification
| DIN 8555 |
|---|
| E20-UM-350-CKTZ |
Typical weld metal composition (%)
| C | Si | Mn | Cr | Mo | Ni | Fe | Co |
|---|---|---|---|---|---|---|---|
| 0.3 | 0.8 | 0.5 | 28.0 | 5.0 | 3.0 | 2.0 | Rest |
All weld metal mechanical properties
| Hardness (as welded) + 20°C | Hardness (as welded) +600°C |
|---|---|
| 32-38 HRC | 250-300 HB |
Packaging data
| Dimension | 3.2x350 | 4.0x350 |
|---|---|---|
| Electr. / packet | - | - |
| Electr. / carton | - | - |
| Kg 1000 electr. | - | - |
| Packets / carton | 4 | 4 |
| Kg / packet | 5 | 5 |
| Kg / carton | 20 | 20 |
Amperes
| A | 100 | 140 |
|---|
