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Hastelloy X is widely used in aero space applications. In this research work, the investigation of Hastelloy x has been carried out at low temperature, that is, cryogenic temperature (−196 °C). The effects have been studied when the material was treated under 12 and 24 h of cryogenic temperature respectively. The mechanical behavior of the material relating to hardness, tensile strength and metallurgical property were studied using Optical Microscope (OM), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDAX) and X-ray diffraction (XRD) after it was cryo treated and a comparison was made with the raw material. The results indicated the cryo treated Hastelloy X had retained the mechanical and metallurgical properties at sub zero temperature. Hence, the results of this study can be used in aerospace industries where the components are subjected to cryogenic temperatures. Keywords: Hastelloy X, Cryogenic treatment, SEM, XRD