Abstract: During the production of silicon steel,the abnormal state of furnace roll of horizontal annealing furnace such as bending deformation,knot on roll surface will generate a great mount of product defects.If these defects can not be solved by other methods,we have to choose to change the problem rolls. The special tool to change rolls on line developed by Maanshan Iron and Steel Co., Ltd. and its operation measures were introduced in this paper. It can be seen in practice that by using this tool, the changing time and energy consumption were reduced, and the problem of online changing of rolls was basically solved.

Key words: non-oriented silicon steel, horizontal annealing furnace, change rolls online