Postalloy® 2506-MCG

Postalloy® 2506-MCG conforms to AWS A5.21:2011 Class ERCCoCr-A. Cobalt base hardfacing alloy with chromium carbides providing excellent resistance to metal to metal wear and corrosion over a wide temperature range. Offers outstanding self-mating, anti-galling properties and it is effective when abrasion is accompanied by thermal shock or impact. Deposits are machinable. Crack-free deposits can be made with proper preheat, post heat and inter-pass temperature.


Product Type

  • Metal-cored
  • Gas-shielded
  • Cobalt Base Hardfacing Alloy


  • Shear blades, Fluid flow valves, Extrusion screws, Roll bushings, and Valve bearing surface.

Weld Deposit Properties

Crack-free deposits with proper preheat (take off)
Deposit Thickness:
2 layers maximum
35Rc - 48Rc

Welding Parameters

Current Type: DC Electrode Positive

Volts Amps Short Arc Gas Stick Out
16-24 80-225 .045" (1.2mm) Ar/CO2 3/4" (19mm)
16-24 80-225 1/16" (1.6mm) Ar/CO2 1" (25mm)
Volts Amps Spray Arc Gas Stick Out
26-31 220-300 .045" (1.2mm) Ar/Ox 3/4" (19mm)
26-31 80-225 1/16" (1.6mm) Ar/Ox 3/4" (19mm)

Welding Procedure:

This wire operates over a wide range of settings and can be used in short-arc and spray transfer. For short-arc welding, use 16-24 volts, 80-225 amps. CO gives the best control, but the most dilution and lowest hardness on first pass. Argon/CO (75/25) gives good control, a better bead appearance and higher first pass hardness. For spray-arc, use 26-31 volts, 220-300 amps. Argon/Oxygen (98/2) works well. It produces minimal dilution and high first pass hardness. Gas flow rate - 40-45 cfh.

Packaging Options

Diameter Standard Packaging
.045" (1.2mm) 5 lb (2.27kgs) spool, 25 lb (11.30kgs) spool
1/16" (1.6mm) 5 lb (2.27kgs) spool, 25 lb (11.30kgs) spool