Reducing the edge deformation of thin electrical steel sheet

Abstract

The edge deformation of cold-rolled electrical-steel sheet in finishing is studied, as well as the change in flatness of the sheet in rolling and heat treatment. The influence of these processes on the edge deformation is determined. The edge deformation is largely due to thermal deformation occurring when coils of strip are heated in cupola furnaces. Quantitative analysis indicates that the thermal deformation is due to the temperature gradients in the coils. Cold-rolling conditions that minimize edge deformation are proposed and tested.