KOBE HF-600

Composition(%)
C 0.48
Si 0.77
Mn 2.58
Cr 2.50
Mo –
V –
W –
Diameter and length (mm)
Dia. 2.6 3.2 4.0 5.0 6.0
HF-600 300 350 400 400 450
Common to individual welding processes
Preparation of base metal:
– Rust, oil and soil attached on the base metal may cause blowholes.
Preheat and interpass temperature:
– In order to minimize cracking, control of preheat and interpass temperature is a key technique
Immediate postweld heating:
– Heating the weldment at 300-350oC for 10-30 Minutes. Control the temperature carefully, or the hardness of the weld will be decreased.
Postweld heat treatment:
– Postweld heat treatment(PWHT) at 550-750oC is effective to prevent cld cracking and distortion in service.
Underlaying:
– Underlaying is effective to prevent cracking in weld here low-alloy steel having high hardenability is hardfaced or where high-hardness weld metal is deposited on carbon steel.
Penetration:
– In hardfacing, the properties of the weld metal will considerably be affected by welding penetration into the base metal.
Welding distortion:
– Intermittent and symmetrical welding sequences are effective to minimize welding distortion.