Abstract: For non-oriented medium and low grade silicon steel products, strip stamping defects caused by annealing furnace roll nodules are common defects in the quality control process of silicon steel. Generally, the higher the silicon content, the higher the probability of nodules occurring in blast furnace rolls. According to production experience, after the occurrence of furnace roll nodding, it is necessary to take measures such as online grinding of rolls, alkaline waste discharge, and increasing the current of brush rolls to slow down nodding, but the above methods can only make up for the negative impact of nodding to a certain extent, and cannot fundamentally eliminate nodding, which makes the production fall into a vicious cycle, not only can't meet the conditions of batch continuous production, but also can't. At the same time, it will affect the quality delivery of highend customer orders and reduce the market competitiveness of silicon steel brands. A series of comparison and verification experiments were carried out to control roll tumbler defects of annealing furnace, and effective measures were taken to control roll tumbler through the matching control of partial pressure ratio of annealing furnace and annealing process, ensuring good strip surface cleaning quality, and reasonably controlling roll speed and strip speed difference.

Key words: non-oriented silicon steel, annealing furnace, furnace roller, nodulation