For the improvement of production planning in a block heating line, a cross-model simulation approach of a block heating line was developed. For this purpose, CFD calculations were carried out for different operating conditions of pit furnace and rotary plate furnace. The relevant result variables can be imported as boundary conditions into a 3D heat conduction model, in which a fast calculation of the reheating takes place, and interpolated if necessary. From the heat conduction model, which can be controlled via a simple program interface, the block heating is calculated over time, so that it can be used to optimize process times depending on furnace mode and material used.