• Harmuth, Harald
• Kircher, Volkmar
• Marschall, Irmtraud

Abstract

The viscosity of mould slags is one key parameter in the continuous casting process of steel. Its measurement using a<br/>viscometer is costly and time and consuming. Therefore, beside viscosity modelling, an inclined plane test to determine<br/>viscosity was proposed by several authors. The task of this study was to find out, whether this method is suitable for quality<br/>control of mould slags, or not. Therefore, an inclined plane test device (IPT) was constructed and operated. At the same<br/>time, the slags were investigated by a viscometer. In total, 80 different slag compositions were investigated. Several options<br/>to represent the viscosity as a function of the ribbon length have been studied, and a suitable relation is proposed. It serves<br/>for detailed statistical studies to assess the error of IPT. While the relation between viscosity and length shows a satisfactory<br/>degree of determination (e.g.&gt;0.97) in this study, this still does not ensure sufficient accuracy of individual applications of<br/>IPT. As the slag undergoes cooling during the test, also the viscosity change in dependence of the temperature contributes<br/>to the result, not only the viscosity of the initial impact temperature. This raises the unexplained variance of the result.

Topics

• impedance spectroscopy
• steel
• viscosity
• continuous casting