Postalloy® 2501-MCG

Postalloy® 2501-MCG conforms to AWS CoCr-C. Contains a higher percentage of chromium carbides than 2506-MCG and 2512-MCG weld deposits, and is harder and more wear resistant, but its impact resistance is somewhat lower and is tougher to machine. Higher tungsten content improves the hot hardness properties and matrix toughness at higher temperatures. Weld deposits also have a greater tendency to relief check if welding procedures are not closely monitored.

Specifications

Product Type

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

Applications

  • Pump sleeves
  • Rotary seal rings
  • Wear pads
  • Expeller screws
  • Bearing sleeves

Weld Deposit Properties

Room Temperature Hardness:
50-55Rc
Hardness at 1500 °F (816 °C):
40Rc
Deposits:
2 maximum
Machinable:
Grind only

Welding Parameters

Current Type : DC Electrode Positive

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

Welding Procedure:

These wires operate 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. CO2 gives the best control, but the most dilution and lowest hardness on first pass. Argon/CO2 (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
1/16" (1.6mm) 5 lb (2.27kgs) spool, 25 lb (11.30kgs) spool