This work presents the new comparative results of Co–Cr alloys, including the surface hardness, mechanical and electrochemical corrosion properties. Two types of samples were prepared by conventional casting (CST) and selective laser melting (SLM) methods. The specimens were made in rectangular sheet shape with dimensions of 20 × 10 × 1 mm, and cylindrical rod of 25 “high” and 5 mm of diameter. Scanning electron microscopy supplied with energy-dispersive X-ray spectroscopy (SEM/EDX) analysis, chemical analyses and surface hardness tests was performed to study the microstructure and surface observation properties of the prepared specimens. Regarding, the elemental composition, our obtained results have shown no statistically significant differences between the test groups. However, the SLM samples have shown better surface hardness value than the CST samples. Moreover, no significant differences were found relating to the electrochemical corrosion test that was confirmed by EDX technique. It has been concluded that the fabrication method can affect the surface hardness properties of Co–Cr alloys.