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Postalloy®
2506-MCG (formerly part 2506-SPL)
Description
POSTALLOY® 2506-MCG: Conforms to AWS CoCr-A. Cobalt base non-cracking hardfacing alloy with excellent resistance to mechanical wear and corrosion over a wide temperature range. It retains an effective hardness even up to 1500°F (816°C). 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.
Specifications
Product Type

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


Weld Deposit Properties
High hardness up to 1500┬░F (816┬░C)  
Crack-free deposits with proper preheat  
Deposit thickness  
2 Layers
Hardness (2 layers)  
35-48Rc
Deposits are machinable  

Applications

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


POSTALLOY® 2506-MCG    Welding Parameters
 
Current: Use DC Reverse Polarity
Short Arc Amps Volts Gas Stick Out
.045" (1.1mm) 80-22516-24Ar/CO23/4"(19mm)
Spray Arc Amps Volts Gas Stick Out
.045" (1.1mm) 220-30026-31Ar/Ox 3/4"(19mm)

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.