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Postalloy® DuraChrome™
2820-MCO (formerly part 2820-SPL)
Description

Postalloy® DuraChrome™ 2820-MCO is a chromium carbide hardfacing alloy that produces a controlled micro-structure of specially sized carbides in a very tough matrix. For applications involving high impact combined with abrasion. Weld metal is tougher than conventional chromium carbide alloys with fewer stress relieving check-cracks. Use on carbon, low alloy, and manganese steels.

Specifications
Product Type

Wire: Metal-cored, open-arc or gas-shielded.
Deposits are slag-free.


Weld Deposit Properties
Hardness  
47-52Rc
Deposit Thickness  
3-5 Layers
Cannot be flame-cut  

Applications

Final overlay on crusher jaws
Impact breaker bars
Cone and roll shells

Pulverizing hammers
Hammer mill hammers


Postalloy® DuraChrome™ 2820-MCO    Welding Parameters
 
Current: DC Electrode Positive
Diameter Amps Volts Stick Out
.045" (1.1mm)100-250 15-26 3/4"-1"(19-25mm)
1/16" (1.6mm)160-300 20-25 1"-1¼"(25-32mm)
3/32" (2.4mm)250-35023-261"-1½"(25-38mm)
7/64" (2.8mm)250-45024-301"-1½"(25-38mm)

Welding Procedure

While all sizes of Postalloy® DuraChrome™ 2820-MCO will easily operate with or without a gas cover, you may find applications for .045" and 1/16" for which you prefer a shielding gas. If a gas cover is used, Argon/CO2 or 100% CO2 is recommended. This will cause amperages to go up by about 10% and the stick-out should be shortened.

When welding out of position, use the lower range of amperages and voltages. In addition, a gas cover may be useful, especially when using a constant current power source and voltage sensing feeder.

Packaging Options
Diameter
Standard Packaging
Special Packaging Available
.045" (1.1mm)
25 lb spool
110 lb drum, 220 lb drum
1/16" (1.6mm)
25 lb spool
110 lb drum, 220 lb drum
3/32" (2.4mm)
55 lb coil
7/64" (2.8mm)
55 lb coil
110 lb drum