FCW 21-O
Hardfacing Cobalt base
Description & applications
• Cobalt base cored wire for self shielded metal arc hardsurfacing
• Co-Cr-Ni-Mo alloy deposit
• Excellent metal-to-metal wear resistance combined with good corrosion resistance
APPLICATIONS
• FCW 21-O is used for hardsurfacing parts subjected to a combination of impact, abrasion, compression, corrosion and high temperatures up to 900°C
• The toughness of the deposit allows excellent resistance to thermal cycles and shocks
• Less crack sensitive than other cobalt base alloys, FCW 21-G is used for building up large-scale sections
• Used for integral seats and guides of large water and high-pressure valve bodies, drop forging dies, pump shafts and sleeves, hot punches etc.
Classification
| EN 14700 | AWS A 5.21 | DIN 8555 |
|---|---|---|
| TCo1 | ERCCoCr-E | MF20-GF-350/50-CKTZ |
Typical weld metal composition (%)
| C | Mn | Si | Cr | Ni | Mo | Fe | Co |
|---|---|---|---|---|---|---|---|
| 0.25 | 1.0 | 1.0 | 28.5 | 3.0 | 5.5 | 4.0 | Bal. |
All weld metal mechanical properties
| Hardness - As welded | Hardness - Work hardened |
|---|---|
| 33 HRc | 47 HRc |
Shielding gas
| Current type/Polarity | DC (+) |
|---|---|
| Protection | self shielded (open arc) |
| Recovery | 90% |
Operating conditions
| Diameter [mm] | Amperage [A] - Range | Amperage [A] - Optimum | Voltage [V] - Range | Voltage [V] - Optimum | Stick-out [mm] - Range | Stick-out [mm] - Optimum |
|---|---|---|---|---|---|---|
| 1.6 | 150-350 | 270 | 24-35 | 28 | 25-50 | 25 |
| 2.4 | 250-450 | 350 | 26-35 | 28 | 25-50 | 30 |
Welding positions
Flat, half up, half down
Packings & Diameters
| Diameters [mm] | < 2.4 mm | > 2.4 mm | > 2.4 mm |
|---|---|---|---|
| Packing(s) | Spool : BS 300 | Metal basket rim EN ISO 544: B450 | Drum |
| Weight [Kg] | 15 | 25 | Up to 330 |
| Description | - | - | - |