Sticking in Hot Rolled Sheet of Ferritic Stainless Steel

Abstract

In hot rolling of ferritic stainless steel, prevention of sticking is very important from the viewpoint of productivity. However, the formation mechanism of sticking has not been clarified sufficiently. Therefore, in this work, rolling experiments were carried out using a tribo-simulator. The results clarified the following points: Sticking occurs more easily on ferritic stainless steel than on high strength steel. On ferritic stainless steel, the work roll sticks with the hot-rolled sheet at the entrance of roll-bite, and the work roll then moves forward on the hot-rolled sheet. Therefore, it is thought that the surface layer of the hot-rolled sheet is fractured by large shear strain, and the work roll stuck with the fractured layer advances further on the sheet, forming a defect with an accumulated fractured surface layer on the hot-rolled sheet. Applying a lubricant oil is effective for prevention of sticking between the work roll and hot-rolled sheet.