UNS R31233

Highly weldable material UNS R31233(ULTIMET) provides a unique blend of properties. From a wear standpoint, it behaves like the STELLITE alloys with lower carbon contents. From a corrosion standpoint, it possesses many of the attributes of the C-type and G-type HASTELLOY materials, in particular outstanding resistance to chloride-induced pitting and crevice corrosion. Its mechanical and welding characteristics are much closer to those of the HASTELLOY alloys than those of the STELLITE alloys, whose low ductilities can be problematic. While ULTIMET alloy has been used successfully in the form of wrought products, its largest applications have involved weld overlays, made with solid wire consumables and arc welding processes such as GMAW (MIG) and GTAW (TIG).

UNS R31233 is a cobalt-based alloy with excellent resistance to galling, cavitation erosion, slurry erosion, liquid droplet impact. Ideal welding material with exceptional ductility and resistance to weld cracking, very easy to apply as an overlay, multiple layers applicable with little to no preheat.

Products Details

ULTIMET UNS R31233 standards:








NACE MR0175/MR0103 ISO 15156

  UNS R31233 Chemical Composition:
Co Cr Ni Mo Fe W Mn Si N C P S B
Bal. 23.5 -27.5 7.0 -11.0 4.0 -6.0 1.0 -5.0 1.0 -3.0 0.10 -1.5 0.05 -1.0 0.03 -0.12 0.02 -0.10 < 0.030 < 0.020 < 0.015
  UNS R31233 Mechanical Properties:  
Heat treatment RP0,2 (N/mm2) Rm (N/mm2) A5 (%) Hardness HRc / HV
AW   >917 >10  
  UNS R31233 Application:

 Valve component overlay

★ Make/breakseal welds in thread unions

 Weld overlays to marine riser tensioners, shafts, and larger hydraulic systems pistons

 Weld overlay to u-bends, piping and valves used in conveying sour crudes containing abrasives

 Slurry, rock, and acid tumblers & mixers


 Fiberglass manufacturing

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