TY - JOUR

T1 - Significance of an inclined plane test for mould slag assessment

AU - Marschall, Irmtraud

AU - Harmuth, Harald

AU - Kircher, Volkmar

PY - 2022/1

Y1 - 2022/1

N2 - The viscosity of mould slags is one key parameter in the continuous casting process of steel. Its measurement using aviscometer is costly and time and consuming. Therefore, beside viscosity modelling, an inclined plane test to determineviscosity was proposed by several authors. The task of this study was to find out, whether this method is suitable for qualitycontrol of mould slags, or not. Therefore, an inclined plane test device (IPT) was constructed and operated. At the sametime, the slags were investigated by a viscometer. In total, 80 different slag compositions were investigated. Several optionsto represent the viscosity as a function of the ribbon length have been studied, and a suitable relation is proposed. It servesfor detailed statistical studies to assess the error of IPT. While the relation between viscosity and length shows a satisfactorydegree of determination (e.g.>0.97) in this study, this still does not ensure sufficient accuracy of individual applications ofIPT. As the slag undergoes cooling during the test, also the viscosity change in dependence of the temperature contributesto the result, not only the viscosity of the initial impact temperature. This raises the unexplained variance of the result.

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

KW - mould flux

KW - Viscosity

KW - Inclined Plane Test (IPT)

KW - ribbon lenghth

M3 - Article

VL - 2022

SP - 14

EP - 22

JO - Metallurgia Italiana

JF - Metallurgia Italiana

SN - 0026-0843

IS - 1

ER -