HPP 221

SEVERE IMPACT HARD-FACING              

JOINING AND BUILD-UP ALLOY FOR SEVERE IMPACT AND COMPRESSION RESISTANCE

GENERAL CHARACTERISTICS

HPP 221 is a tough, high-strength electrode for use where high impact and high compression strength is needed.  Weldable in all positions.  HPP 221 applies easily with minimum spatter loss.  The non-popping slag is easily removed.  Deposits are nonmagnetic and can be flame-cut or forged. 

TYPICAL APPLICATIONS: 

Excellent for manganese or manganese-to-steel applications.  Specially formulated for use on railroad industry.  Additionally, it's good compressive strength makes it ideal as build-up prior to hard-facing.  Also excellent for high impact situations like crusher roll build-up, crusher jaws, hammer mill hammers, bucket teeth, etc.  No limit to deposit thickness

Welding Parameters

Diameter5/32"3/16"1 /4"

Amperage125-170160-225225-390

CurrentAC or DC either polarity (electrode+ or -)

Technical Data:

Tensile Strength...up to 116,000 PSI

Hardness (as welded)....83-91 RB

Hardness (as work hardened)......42-47 RC

Elongation....38%

Machinabilitywith carbide tools

Forgeability..Yes

Procedure:  Remove all dirt, grease and surface scale.  Use suggested amperage to get proper weld shape.  Keep weld interpass temperature as low as possible; do not exceed 5000F (2600C).