A ROLL’S WEAR DURING HOT ROLLING OF HIGH-SILICONSTEEL AND ITS IMPACT ON THE QUALITY OF A STRIP’SPROFILE

Abstract

Hot rolling of grain-oriented high silicon steel is related to technical problems such as high temperature andlong rolling campaigns with strips of the same width. Numerous methods may be carried out as a solutionto these problems. Before the rolling campaign, all rolls of finishing stands are exchanged. The campaign isscheduled with additional exchanges of rolls on two last stands in two stages. A roll’s wear increases with thequantity of rolled material and may lead to strip profile deformation. Exchanging the rolls ensures the requiredsteel quality and prevents losses caused by quality defects. This work identifies factors affecting the workroll's wear and refers to the material from which rolls are made. This work aimed to determine the wear ofwork rolls of the finishing group rolling mills during the rolling of high-silicon steel. The work presents wearanalyses of 30 rolls. It was analysed depending on roll type and high silicon steel rolled material quantity.Compared wear of rolls after rolling high-silicon steel and black sheet. By analysing the distribution of rollwear along the length of the roll, it was found that the wear of working rolls directly affects the geometry ofthe rolled sheet, which may affect the quality of the strip profile of the rolled sheet.