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Postalloy®
2501-MCG (formerly part 2501-SPL)
Description
POSTALLOY® 2501-MCG: Conforms to AWS CoCr-C. A high hardness cobalt base hardfacing alloy with outstanding resistance to abrasion, oxidation, erosion and corrosion. Deposits are harder than 2506-MCG and 2512-MCG, and is especially recommended for metal-to-metal wear. Deposits are highly resistant to galling, retain their high hardness at red heat, and recover full hardness after exposure to temperatures as high as 1500°F (816°C). The higher hardness also means a greater tendency to relief check upon cooling.
Specifications
Product Type

Wire: Metal-cored, gas-shielded cobalt base hardfacing alloy


Weld Deposit Properties
Hardness (2 layers)  
48-59Rc
Excellent sliding, metal-to-metal wear resistance with unusually good resistance to galling  
Excellent heat resistance - deposits recover full hardness after exposure to temperatures as high as 1500┬░F (816┬░C)  
Deposits are non-machinable  

Applications

Pump sleeves, Rotary seal rings, Wear pads, Expeller screws and bearing sleeves.


POSTALLOY® 2501-MCG    Welding Parameters
 
Current: Use DC Reverse Polarity
Short Arc Amps Volts Gas Stick Out
1/16" (1.6mm)80-22516-24Ar/CO21"(25mm)
Spray Arc Amps Volts Gas Stick Out
1/16" (1.6mm)220-30026-31Ar/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. 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.