Abstract: Based on the analysis of carbon sleeve nodulation theory and on-site process practice, this paper summarized the mechanism and control elements of carbon sleeve roller nodulation evolution in non-oriented silicon steel continuous annealing furnace. Through equipment modification of the annealing furnace, reducing the carbon content of the base material before annealing, controlling the dew point and atmosphere inside the furnace, enhancing the surface control of the base material before annealing and the cleaning quality of the alkali washing process, and regulating the material management regulations, the occurrence of carbon sleeve roller nodulation has been effectively reduced. By using the speed compensation method to quickly locate the range of nodules and reduce the preparation time for the positioning of nodule rollers, the goal to improve the high quality, continuity, and periodicity of continuous annealing furnace production has been achieved.

Key words: continuous annealing furnace, carbon sleeve roller, nodulation