Salzgitter Flachstahl GmbH (Salzgitter, Germany):

M. Schäperkötter

P. Müller

S. Roβius

VDEh Institute of Industrial Researches (Düsseldorf, Germany):

T. Lamp, e-mail: torsten.lamp@bfi.de

Well controlled strand solidification inside the secondary cooling area is an essential requirement for a good inner quality and avoiding of cracks. Therefore, temperature measurement at several locations between the rolls of the first segment was performed. The used innovative surface temperature measurement system developed by BFI Institute has proved to be well suited for measuring at this difficult location in the severe conditions of secondary cooling area. A comparison with the numerical 3D dynamical on-line solidification model resulted in a good agreement at the top of the first segment. It is shown that dynamical behavior of the dual-component cooling system in the conditions of increased lowering of casting rate seems to be overestimated, because the measured data are characterized by more harsh decrease of a strand surface temperature, compared with calculated parameters. It is concluded that more slow varying of casting rate resulted in practical coincidence of measured and calculated values of surface temperature lowering at one level.

1. Schäperkötter, M.; Müller, P.; Geerkens, C.; Becker, M.; Kerp, U.: Iron & Steel review 57 (2013) Nr. 6, S. 100/106.
2. Lamp, T.; Köchner, H.: stahl u. eisen 129 (2009) Nr. 7, S. 69/72 .