Steel carbides MC (HfC, NbC, ZrC, TaC and TiC) that had been uncovered to air beneath the ambient temperature situation for a time period had been characterised by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), excessive decision transmission electron microscopy (HRTEM) and Raman. Contemporary MC samples uncovered to the air for various time (recent, at some point, one week and one quarter) illustrated surprising oxidation diploma of the surfaces. XRD assessments offered very restricted data, because the oxidation course of occurred from the floor on the nanometer scale. Nevertheless, the XPS assessments offered extra complete data for the MOx (HfO2, ZrO2, Nb2O5, Ta2O5 and TiO2) movie and MC (HfC, NbC, ZrC, TaC and TiC) interlayer. In the meantime, the HRTEM and Raman assessments might give some further or supporting data for XPS assessments, when the samples had been uncovered to the air for longer time (one week or one quarter). In the meantime, this analysis is the primary to indicate that the oxidation progress of the metallic surfaces of HfC, NbC, ZrC, TaC and TiC can happen in air beneath the ambient temperature situation and the oxidation movie is about 2–5 nm. In the meantime, a brand new oxidation mechanism of metallic carbides MC (HfC, NbC, ZrC, TaC and TiC) uncovered to air beneath the ambient temperature situation can also be proposed, contemplating the obtained Raman, TEM and XPS outcomes that would clearly verify the formation of HfO2 and free carbon.