TY - JOUR

T1 - Automated break temperature determination of mould slags for the continuous casting of steel based on temperature-dependent viscosity data

AU - Kölbl, Nathalie

AU - Harmuth, Harald

PY - 2019/7/25

Y1 - 2019/7/25

N2 - The continuous casting process of steels is mainly influenced by the infiltration of mould slag into thegap between the strand and the mould and the temperaturedependent solidification behaviour ofthe slag. Thus, measurements of the temperaturedependent viscosity and the determination of the break temperature, TBr, which is related to the formation of the first solids in the liquid slag, based on the recorded viscosity data are essential to characterizing mould slags. To enable automatic, person-independent data analysis method, a procedure must be developed that calculates TBr based on the log η versus 1/T representation. This aim was achieved by detecting the maximum absolute value of the second derivative of log η after regression and relating the associatedtemperature to TBr; comparisons between these values and the manually determined values showed good agreement. Furthermore, the error was assessed by statistical analysis and the effect of sampling frequency was analysed.

AB - The continuous casting process of steels is mainly influenced by the infiltration of mould slag into thegap between the strand and the mould and the temperaturedependent solidification behaviour ofthe slag. Thus, measurements of the temperaturedependent viscosity and the determination of the break temperature, TBr, which is related to the formation of the first solids in the liquid slag, based on the recorded viscosity data are essential to characterizing mould slags. To enable automatic, person-independent data analysis method, a procedure must be developed that calculates TBr based on the log η versus 1/T representation. This aim was achieved by detecting the maximum absolute value of the second derivative of log η after regression and relating the associatedtemperature to TBr; comparisons between these values and the manually determined values showed good agreement. Furthermore, the error was assessed by statistical analysis and the effect of sampling frequency was analysed.

KW - Viscosity; mould fl uxes; break temperature; continuous casting; automatic detection; viscometer; statistic analysis; sampling frequency

U2 - 10.1080/03019233.2019.1639028

DO - 10.1080/03019233.2019.1639028

M3 - Article

VL - 47.2019

SP - 899

EP - 902

JO - Ironmaking and steelmaking

JF - Ironmaking and steelmaking

SN - 0301-9233

IS - 8

ER -