Modelling of oxide scale surface roughness in hot metal forming

Oxide scale formed in hot metal forming and its surface roughness characteristics are very important for the quality of the finished product. In this paper, the oxide scale and steel surface roughness changes in hot strip rolling are analysed using the finite element software MSC-MARC package. A model generating a surface roughness profile which reproduces the random characteristics of surface roughness and asperity shape was applied in this study. Surface roughness deformation characteristics of the oxide scale are obtained from the finite element simulation. The features of the oxide scale surfaces with and without oil lubrication in the roll bite are investigated. Simulation results are compared to the measured values. The rolling temperature effect is also discussed.