HardCover 420 (HC420) is a high chromium cast iron for hard surfacing components subject to extremely severe abrasive wear and moderate impact. The weld deposit contains a high proportion of hard primary chromium carbides in a tough austenitic matrix. HC420 is used for hardfacing components undergoing wear by earth, sand and abrasives.
Typical Applications:
Gyratory crusher cones and mantles
Catalyst pipes and valves
Slurry pipes and valve bodies
Dredge pump bodies
Sand dredge parts
Extruder screws
Mining and earth moving equipment
Typical Wire Chemisty (As welded):
C/5
Mn/1.5
Si/1.5
Cr/27
Fe/BAL
Hardness, Hv (HRc):
HRC/55 - 60
HB/520 - 578
AWS Classification:
Hardfacing
Welding Current:
DCEN
Shielding Gas:
None
Typical Mechanical Properties (As Welded):
Hardness on 3 layers, Rc 60 - 62
Welding Positions:
F,H
HARDCOVER_420.pdf
