Effect of Coiling Operation on Strip Quality of 4.5 Si Steel in Twin-roll Casting Process

摘要

Rapid solidification in the twin-roll casting process allows the production of thin strip with a unique combination of properties, directly form the melt. However, the production of the thin strip without any intermediated technological processing, is accompanied by strong demands on quality of the as-cast strip and requires full understanding of all aspects of twin-roll casting technology. The present study was aimed at an experimental analysis of the influence of ocntinuous coiling in the twin-roll casting process on structure, properties and the shape of as-cast high silicon electrical steel strip. It was found that solidification, cooling and plastic deformation produce high stress heterogeneity in the as-cast strip which exists in a non-equilibrium state. When the compressive residual stress, attains a critical value the strip loses its flatness and waviness of a sinusoidal shape appears on the surface in the casting direction. When the tensile residual stress reaches the yield strength of the casting materials, cracks may be appear in the strip.