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    Sub-zero (Cryogenic) Treatment  
 
Heat Treatment Processes
Vacuum Hardening
Nitriding
Sub-zero (Cryogenic) Treatment
Oxidation
Carburizing
Austempering
Stress Relieving
Induction
Aluminum Heat Treatment

Sub zero also called as cryonegic treatment is modified cooling application and performed for tools which need high wear resistance.After conventional quenching there is retained austenite in microstructure of steel part in high quantity.The best effective solution of preventing retained austenite is sub zero treatment after classical hardening process. In subzero treatment pieces are cooled down to -140°C with vapour of liquid nitrogen and gained martensitic microstructure.