Crucible Steel CPM M4 (4.3 x 50 x 915 mm)
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Hot rolled steel bar measuring 4.3x50x915mm.
CPM M4 is a high vanadium Crucible Industries Particle Metallurgy high speed steel with extremely high wear resistance and good toughness. For this reason it is widely used in competition cutting knives. It is very hard to work with in a hardened and tempered state, the majority of shaping and finishing should be done before heat treatment.
Recommended working hardness 62-64HRC.
CPM M4 can be used with or without a cold treatment to deal with retained austenite after quenching. CPM M4 tempered at low temperature after cold treatment may exhibit a slight increase in stain resistance, though it is nowhere close to a stainless steel.
Recommended Heat Treatment
*Seal blade in double crimped high temperature stainless steel tool wrap
*Preheat to 830°C, hold for 5 minutes
*Preheat to 1000°C, hold for 5 minutes
*Austenitise at 1085°C for 30 minutes
*Cold treatment; domestic freezer, dry ice slurry, liquid nitrogen – the colder the better
*Temper at 200-260°C for 2 hours, twice
*Alternatively, if not using cold treatment, temper at 540°C for 2 hours, twice, to take advantage of secondary hardening
|Dimensions||92 × 5 × 4.5 cm|