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Cryogenic processing will not in itself harden metal like quenching and tempering. It is not. Classification of Cryogenic Treatment Cryogenic treatment has been Abstract. Cryogenic hardening is a cryogenic heat treating process where the material is cooled to approximately −185 °C (−301 °F), usually using liquid Methods to Produce Low Temperatures : · Cryogenics in fuels : · Cryogenic Rocket Engines : · VULCAIN 2 ROCKET ENGINE : · Cryogenic Heat Treatment : · In alloy steels This paper describes about cryogenic tempering, its working and the changes that occur in metal structure when the treatment of metals is done.