Abstract: In order to study the temperature field and heat change of slab in furnace heating process under different charging methods, and to explore the energy saving advantages of hot transport and hot charging rolling, a two-dimensional heat transfer model of slab in furnace heating under cold charging, warm charging and hot charging was established by using finite element method based on the hot delivery and hot charging production line of a steel plant, and the correctness of the model was verified by field temperature measurement. The results show that during the heating process, the temperature distribution of cold charging billets is similar to that of warm charging billets with the highest corner temperature and the lowest core temperature distribution, while the hot charging billets have a process of gradually transferring the low temperature region from the corner to the core. The higher the charging temperature is, the greater the proportion of influence on the heating process. The heat content of hot charging billets before charging is 16.48 times of that of cold charging billets. The heat absorbed by hot charging billets is only 38.22 % of that of cold charging billets and 52.30 % of that of warm charging billets.

Key words: hot transport and hot charging rolling, slab heating, numerical simulation, finite element method, temperature field