A Comparison of Models Describing Heat Transfer in the Primary Cooling Zone of a Continuous Casting Machine

Abstract

This paper presents the findings of research conducted concerning the determination of thermal boundary conditions for the steel continuous casting process within the primary cooling zone. A cast slab -with dimensions of 1100 mm×220 mmwas analysed, and models described in references were compared with the authors' model. The presented models were verified on the basis of an industrial database. The research problem was solved with the finite element method using the ProCAST software package.Keywords: continuous casting of steel, heat transfer coefficient, numerical modelling, ProCAST W pracy przedstawiono wyniki badań dotyczących wyznaczenia termicznych warunków brzegowych dla procesu ciągłego odlewania stali w obszarze strefy pierwotnego chłodzenia. Analizie poddano wlewek płaski o wymiarach 1100×220 mm. W obliczeniach porównano modele opisane w literaturze wraz z modelem własnym. Zaprezentowane modele zweryfikowano na podstawie przemysłowej bazy danych. Zadanie zostało rozwiązane metodą elementów skończonych z zastosowaniem pakietu oprogramowania ProCAST.

Effect of Nozzle Parameters on the Temperature Field, Flow Field and Stress Field in the Continuous Casting of Steel Billet

“…L is characteristic length.  Secondary cooling zone(under the mould) , the empirical equation [13,14] can be expressed as …”

Strategy of Cooling Parameters Selection in the Continuous Casting of Steel

“…Figure 3 presents a diagram of thermal resistances in the formulated model. [12][13][14] Fig. 1 Diagram of the thermal resistances [12][13][14] In the model of the heat transfer in the gaseous gap, two basic heat transfer mechanisms -by radiation and by conductivity [14] were assumed.…”

“…[12][13][14] Fig. 1 Diagram of the thermal resistances [12][13][14] In the model of the heat transfer in the gaseous gap, two basic heat transfer mechanisms -by radiation and by conductivity [14] were assumed. The heat transfer coefficient between the strand surface and the mould h is: (1) where:…”

“…This paper assumes a maximum value of the heat transfer coefficient of 1600 w m -2 K -1 . [5,13,14] a change in the heat transfer coefficient is related to the assumed point of the air gap formation. The value of the heat transfer coefficient was implemented as the function of solidifying cast strand surface temperature.…”

“…The value of the heat transfer coefficient on the outer mould walls was assumed at 24000 w m -2 K -1 . [5,13,14] It is a value corresponding to the heat absorption directly effected by the cooling water flowing in the mould channels. This value is related to the shape and volume of the mould channels in relation to the total volume of the mould.…”