本文用独立组元法对吸热式氮基气氛与碳钢间的多元反应复杂平衡体系在前人简单反应的工作基础上进行了热力学计算,得到了有关的方程式。对体系中各组分在不同温度下的平衡组成和碳势,以及不同氮含量时气氛的碳势进行了计算。计算结果表明,在一定温度下,气氛的碳势随CO_2浓度的增加而减少;在一定CO_2含量时,炉温越高,则气氛的碳势越低。 In this paper, thermodynamic calculations were carried out on the complex reaction system of endothermic nitrogen-based atmosphere and carbon steel with simple reaction based on the independent component method, and the related equations were obtained. The equilibrium composition and carbon potential of each component in the system at different temperatures and the carbon potential of the atmosphere at different nitrogen contents were calculated. The calculated results show that at a certain temperature, the carbon potential of the atmosphere decreases with the increase of CO 2 concentration. At a certain CO 2 content, the higher the furnace temperature, the lower the carbon potential of the atmosphere.