AWS A5.21 ERCoCr-B
Cobalt 12
ERCoCr-B electrodes and rods are similar in composition to deposits made using ERCoCr-A (Cobalt 6) electrodes and rods, except for a slightly higher percentage (approximately 16%) of carbides. The alloy also has a slightly higher hardness and better abrasive and metal-to-metal wear resistance. Impact and corrosion resistance are lowered slightly. Deposits can be machined with carbide tools.
ERCoCr-B (Cobalt 12) electrodes and rods are used interchangeably with ERCoCr-A (Cobalt 6) electrodes and rods. Choice will depend on specific application.
| Nominal Chemistry Composition (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| C | Mn | Si | Cr | Ni | Mo | Fe | W | Co | OE |
| 1.2-1.7 | 1.0 max | 2.0 max | 26-32 | 3.0 max | 1.0 max | 3.0 max | 7.0-9.5 | BAL | 0.50 max |
| Minimum Mechanical Properties | |
|---|---|
| Hardness (HRC) | 34-47 |