Physical Modeling of the Steel Sheet Topography in Skin Pass Rolling and Its Influence on Susceptibility of Sheets to Deep Drawing

Abstract

This work is focused on the formation of sheet surface topography and its influence on drawability of sheets. 3D roughness measurements is used to study surface topography and cupping tests by Erichsen and by Swift – to establish and to compare drawability of steel sheets with and without surface treatment. In addition, statistical analysis is presented to determine parameters characterizing the surface topography which has a decisive influence on the susceptibility to sheet‐metal forming. The research shows that a change in surface topography in steel sheets with high plasticity (grades DC03, DC04, and DC05) does not significantly affect their drawability measured in Erichsen test, but it can significantly affect the susceptibility of sheets to deep drawing. In case of stainless steel X6Cr17, a clear impact of surface topography on the technological properties is ascertained – both the Erichsen's value and the limit drawing ratio depend strongly on the type of abrasive used for vapor blasting.