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Physical Modelling of Metal Bath Flow in the Tundish and Importance of Validation Experiments

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Accuracy and thus the applicability of physical modelling results in the field of metallurgical processes must respect the basic rules of similarity theory and practice between the two systems. The choice of model geometry (length) scale is one of the basic factors which must be very carefully determined. This paper deals with the assessment of the impact of the geometric scale of the physical model of a tundish on the coincidence of the simulation results. Two models of an identical operating tundish designed on the scales 0.2 and 0.25 (1:5 and 1:4) were used for the experimental study. Different boundary conditions, including changes in the geometry of the bottom without any kind of impact pad (e.g. “Turbostop") were used to study the correctness of the similarity theory betwe[...]

Modification of Slag in the Ladle by the Help of Briquetted Fluxing Agents

  The paper presents results of influence of thinner additions into the steelmaking slag on steel desulphurization in the ladle. Compa- rison of effectivity of two developed briquetted thinners based on Al2O3 with the thinner in common used at the steelworks Třinecké železárny, a.s. was made. W artykule przedstawiono wyniki badań wpływu dodatków upłynniacza żużla na odsiarczanie stali w kadzi stalowniczej. Przeprowadzono porównanie skuteczności dwóch rodzajów badanego, brykietowanego upłynniacza żużla na bazie Al2O3 z upłynniaczem powszechnie stosowanym w stalowni Třinecké železárny, a.s. Key words: fluxing agent, fluorspar, corundum, steel, secondary metallurgy Słowa kluczowe: upłynniacz żużla, fluoryt, korund, stal, rafinacja pozapiecowa Table 1. Chemical composition of the steel grade S355J Tablica 1. Skład chemiczny stali S355J Element C MnSi P S Cu CrNiAl Min. content (wt. %) Max. content (wt. %) 0.201.450.550.0300.0300. 2011 r. HUTNIK-WIADOMOŚCI HUTNICZE S. 773 EN 10025-2). Chemical composition of this steel is given in Table 1. After processing of the heat in oxygen converter a slagless tapping into a ladle was performed. The ladle contained prepared slag mixture, comprised of the tested fluxing agent and lime in proportion 1 : 4. During tapping steel was deoxidi[...]

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