研究了碳含量（0.13%，0.25%，0.32%，质量分数）对Cr25系高铬铸钢显微组织、高温抗氧化性能及高温耐磨性的影响。结果表明：不同碳含量铸钢的显微组织均由铁素体和（Cr·Fe）₂₃C₆型碳化物组成，随着碳含量增加，碳化物由不连续长杆状转变成连续网状，且由完全沿晶析出逐步转成沿晶和晶内析出；在1200℃高温氧化初期，试验钢快速氧化，氧化40h后，因表面形成致密的铬氧化物保护层，氧化速率趋缓，进入稳定氧化阶段；随着碳含量增加，试验钢的高温抗氧化性降低，耐磨性增强，磨损机制由黏着磨损变为黏着及磨粒磨损共同作用机制。

The effects of carbon content (0.13wt%, 0.25wt% and 0.32wt%) on the microstructure, high-temperature oxidation resistance and high-temperature wear resistance of Cr25 high-chromium cast steel were investigated. The results show that the microstructures of the cast steels with different carbon content are composed of ferrite matrix and (Cr ·Fe)₂₃C₆ carbide. The morphology of carbides changes from discontinuous rod-like to continuous net-like, and the precipitation way changes from intergranular to intergranular and intragranular precipitation. In the early stage of oxidation at 1 200 ℃, the tested steel is oxidizing rapidly. After oxidation for 40 h, the oxidation rate tends to remain stable and the tested steel is in a stable oxidation stage due to the chromium oxide protective layer formed on the surface. With the increase of carbon content, the high-temperature oxidation resistance of the tested steel decreases while the wear resistance increases, and the wear mechanism changes from adhesive wear to the combining of adhesive and abrasive wear.