Hardening is one of the oldest metallurgical processes known to man, originally in the form of heating a sword in the fire and then throwing it into the lake to make it harder. The more modern approach is to heat components in an atmosphere furnace followed by quenching, generally in heated oil.
The expression “conventional hardening” is used here to differentiate the process from vacuum hardening. It should also be noted that “hardening” is usually referred to as “quenching”.
A more refined version of this process is Vacuum Hardening.
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