<p>The high-temperature oxidation mechanism of press-hardening steel in a CO₂ gas environment was investigated using scanning electron microscopy, energy-dispersive x-ray spectroscopy, and Raman spectroscopy based on an actual heating industrial system. The micro-phase structure and morphological characteristics of the interface between the oxide sheet and the steel matrix under varying heating conditions were characterized. The results showed that as the CO₂ content increased, the oxidation weight gain exhibited a decreasing trend, while the overall oxidation kinetics followed a parabolic pattern. The Si element is enriched at the interface between the iron sheet and the steel matrix, where selective oxidation occurs, resulting in the formation of Fe₂SiO₄ spinel compounds within the interface layer. At heating temperature approaching the melting point of Fe₂SiO₄ (1150&#xa0;°C), the compound mainly adopts a spherical distribution at the interface of the steel matrix. However, at temperatures exceeding 1150&#xa0;°C, Fe₂SiO₄ forms a grid-like pattern near the FeO phase. The existence of these mesh-like Fe₂SiO₄/FeO binary eutectic structures enhances interfacial binding strength, which hinders descaling. Optimizing the heating system provides theoretical guidance for developing on-site steel burning systems.</p>