Spalling Prevention and Wear Improvement of Rolls in Steel Strip Hot-Rolling Process

Rolls are key components in hot strip mill. Roll wear and fatigue are inevitable phenomena during hot-rolling process. Finite element (FE) analysis shows that roll profiles, especially work roll wear profile, have significant effects on contact stress distributions. Long-term effect of huge contact stress peaks in roll sides is the main factor for roll spallings. In order to solve serious roll spallings, a design process of backup roll profile is proposed to homogenize contact stress distributions. FE calculation demonstrates the superiority of the new profile in eliminating stress peaks. Industry application also manifests its good performance in preventing roll spalling and improving roll wear.