Impact of casting speed on temperature field of continuously cast steel billets

abstrakt

angličtina

In continuous casting the casting speed is one of the most important parameters that influence the entire process of steel production. From the physical point of view, the casting speed affects the temperature field formation along the cast steel blank, e.g. the surface and corner temperatures, as well as the solidification of steel, e.g. the shell thickness, isosolidus and isoliquidus curves, the metallurgical length and the width of mushy zone1. Moreover, the casting speed is also considerably related to the productivity of steel. In order to achieve a desired steel structure, temperature ranges in particular positions (e.g. due to the straightening), and to minimize the occurrence of surface defects or even cracks it is very important to pay attention to a proper determination of casting speed according to a particular steel grade being cast. The aim of the paper is to investigate the impact of casting speed and its change on the temperature field formation of continuously cast steel billets, and on aforementioned parameters, mainly on surface and corner temperatures and the solidification through the cast billet. For the analysis the originally implemented numerical model of transient temperature field2 of continuously cast billets, which has been experimentally verified on a real caster in Zeleziarne Podbrezova in Slovakia, is utilized and several commonly cast steel grades are considered. The results prove a significant influence of casting speed on the temperature field of cast billets and on related parameters. Conclusions may be utilized, e.g., for the setup of the caster.

continuous casting, casting speed, temperature field, solidification

KLIMEŠ, L.; ŠTĚTINA, J.; BUČEK, P.

17. 10. 2012

Institute of Metals and Technology

Ljubljana, Slovenia

978-961-92518-5-0

Program and book of abstracts, 20th Conference on Materials and Technology

178

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