Together with Ebner Industrieofenbau, ENRAG developed a fully transient plant model for continuous annealing lines. The model is directly connected to the plants automation system. It takes inputs like fuel flow and blower speeds and calculates the temperature distribution in the annealing line including the temperature of the steel strip in each point of the line. This information is then returned to the automation system and delivers this information to the operators desk. Based on new developed algorithms the digital twin optimizes the transition phase between different strips and delivers immediate instructions to the operator in case of partial plant failure (e.g. heating zone failure) to optimize strip quality in every phase of operation.