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Highly weldable material UNS R31233 (ULTIMET) provides a unique blend of properties. From a wear standpoint, it behaves like cobalt alloys with lower carbon contents. From a corrosion standpoint, it possesses many of the attributes of high-performance nickel alloys, in particular outstanding resistance to chloride-induced pitting and crevice corrosion.
UNS R31233 is a cobalt-based alloy with excellent resistance to galling, cavitation erosion, slurry erosion, and liquid droplet impact. It is an ideal welding material with exceptional ductility and resistance to weld cracking, very easy to apply as an overlay, with multiple layers applicable with little to no preheat.
| Product Form | Standard Specification |
|---|---|
| Sheet/Plate/Strip | ASME SB818 / ASTM B818 |
| Bar/Rod/Wire/Pipe | ASME B815 / ASTM B815 |
| DIN | 2.4681 / CoCr26Ni9Mo5W |
| Others | NACE MR0175 / MR0103 ISO 15156 |
| Co | Cr | Ni | Mo | Fe | W | Mn | Si | N | C |
|---|---|---|---|---|---|---|---|---|---|
| Bal. | 23.5-27.5 | 7.0-11.0 | 4.0-6.0 | 1.0-5.0 | 1.0-3.0 | 0.1-1.5 | 0.05-1.0 | 0.03-0.12 | 0.02-0.1 |
ULTIMET alloy is very amenable to Gas Metal Arc (GMA/MIG), Gas Tungsten Arc (GTA/TIG), and Shielded Metal Arc (SMA/Stick) welding processes. It can be hot worked and cold worked, though it is very strong and work-hardens rapidly. Annealing at 1177°C (2150°F) followed by water quenching is advised to restore optimum properties after forming operations.
