Ultimet (UNS R31233 / W.Nr. 2.4681)

Ultimet alloy (UNS R31233 / W.Nr. 2.4681) provides a unique blend of properties. From a wear stand- point, 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.

Equivalent Grades


Chemical Composition, %


Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B815
Plate, Sheet and StripASTM B818, ASME SB818
Pipe and Tube
Welding Product


  • Particular outstanding resistance to chloride-induced pitting and cretive corrosion
  • Exceptional 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 appliable with little to no preheat.


Ultimet alloy is used in industrial components such as valves, mixers, nozzles, and slurry pumps.