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Hardening and Tempering
A hardening cycle refers to the heating and cooling treatment process that is used to harden and toughen the metal. A further tempering process reduces the hardness but toughens the part. These processes if done in vacuum will produce bright and clean part surfaces.
Vacuum Annealing
Also known as bright annealing, this vacuum heat treatment process softens metals, delivering required micro-structure changes. This process improves machinability, dimensional stability amongst other properties.