在对钢管中频加热过程进行理论分析的基础上,从麦克斯韦方程组和导热微分方程出发,考虑了材料物理性能随温度变化对加热过程的影响,使用Ansys软件建立了钢管电磁-热耦合分析的有限元模型,对钢管中频感应加热问题进行了数值模拟计算.计算结果中工件外表面温度与实测温度相差5.19%,吻合较好.提出了感应透热深度的概念,并以此区分钢管内感应加热区域和热传导区域.根据模拟结果讨论了钢管感应透热深度及温度分布的影响因素,并证明了双线圈感应加热工艺在工件温度分布、热效率及频率分配方面的合理性. Based on the theoretical analysis of medium frequency heating process of steel tube, from the Maxwell’s equations and the differential thermal conductivity equation, the influences of the physical properties of the material on the heating process with the change of temperature were considered. By using Ansys software, the finite element analysis of electromagnetic-thermal coupling Element model, the numerical simulation of the medium frequency induction heating of the steel tube was carried out. The calculated results show that the temperature of the outer surface of the workpiece differs from the measured temperature by 5.19%, which is in good agreement with each other. The concept of induction depth is proposed, Region and heat conduction area.According to the simulation results, the influencing factors of induction depth and temperature distribution of steel pipe are discussed, and the rationality of dual-coil induction heating process on workpiece temperature distribution, thermal efficiency and frequency distribution is proved.