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Product Reference View detailed information about Postalloy® Hardfacing Products
POSTALLOY®
218HD
Description
Sinter Breaker
Sinter Breaker
POSTALLOY® 218HD is designed for applications involving severe mineral or earth abrasion at temperatures up to 1400°F (760°C). This unique tubular hardface electrode is actually a combination of five types of carbides, uniformly dispersed throughout the weld metal. Several of these carbides have micro-hardness readings that are harder than tungsten carbide. First pass hardness is greater than other hardface electrodes - 63Rc on mild steel. Other outstanding features include:
   • Easy out-of-position weldability with the 1/4" diameter
   • Excellent AC or DC operation, even on a "buzz box"
   • Low amperage and high metal recovery - no slag to chip
   • High deposition rates - up to 3 times faster than ordinary electrodes
   • Moisture resistant coating, even under severe weather or high humidity
POSTALLOY® 218HD hardfacing is a unique concept in hardfacing technology and is over 90% efficient. It is tubular, permitting higher travel speeds and much higher percentages of carbide forming elements contained in the core than with ordinary flux-coated electrodes. The tubular design offers very smooth operational characteristics.
Specifications
Product Type
Flux-coated Tubular Electrode

Weld Deposit Properties
Hardness
63-66Rc
Heat Resistance
Excellent up to 1400°F (760°C)
Deposit Thickness
2 layers
Weld deposits will relief check-crack readily

Applications
Solid waste shredder parts
Agricultural implements
Earth moving and construction equipment
Cement mill parts
Brick making equipment
Cereal grinding equipment and muller plows

POSTALLOY® 218HD    Welding Parameters
Current: AC or DC Reverse Polarity
Diameter
Amps
1/4" (6.0mm)
80-130
3/8" (9.5mm)
130-180
1/2" (12.7mm)
180-220

Welding Procedure
Remove old hardfacing and any fatigued base metal. POSTALLOY® 250 gouging electrode is useful for this purpose. Preheat from 200-400°F (93-204°C) is recommended for steels with a carbon content of .25 to .45. Steels with a higher carbon level should be preheated from 400-700°F (204-371°C). Do not preheat austenitic manganese steel. Use a minimum arc length equal to about the diameter of the electrode. Hold the electrode at 90° to the work surface for proper application. Do not apply more than two layers. On manganese or hardened steel, an intermediate or cushion layer of POSTALLOY® 207 is recommended.


Packaging Options
Diameter
Standard Packaging
1/4" (6.0mm)
Resealable Plastic Box
3/8" (9.5mm)
Resealable Plastic Box
1/2" (12.7mm)
Resealable Plastic Box