Identification of the Boundary Conditions in the Continuous Casting of Steel

Abstract

The results of investigations relating the determination of thermal boundary conditions for continuous casting of steel were presented in the paper. The slab of dimensions 1100 mm x 220 mm was analyzed. In numerical calculations two models were compared. The first was the simple one and it used average heat transfer coefficient in both cooling zones. The second one used complex models in primary and secondary cooling zones. The presented models were verified on basing on an industrial data base. The problem was solved by the finite element method and the commercial numerical packet ProCAST.Keywords: continuous, casting of steel, boundary conditions, numerical modeling W pracy przedstawiono wyniki badań dotyczących wyznaczenia termicznych warunków brzegowych dla procesu ciągłego odlewania stali. Analizie poddano wlewek płaski o wymiarach 1100 mm × 220 mm. W obliczeniach porównano modele uproszczone, wykorzystujące średni współczynnik wymiany ciepła w strefie chłodzenia pierwotnego i wtórnego oraz modele rozbudowane. Zaprezentowane modele zweryfikowano na podstawie przemysłowej bazy danych. Zadanie zostało rozwiązane metodą elementów skończonych z zastosowaniem pakietu numerycznego ProCAST.

Comparison of Four Models of Radiative Heat Transfer Between Flat Surface to Evaluate the Temperature Field Based on Example of the Continuous Casting Mould

“…The overall heat transfer coefficient h sm4 has been supplemented by conduction according to equation (7). The determined heat transfer coefficients -as functions of mould length are presented in the graph (Fig.…”

“…Modelling of the temperature distribution in the process of cast strand solidification has been analysed by several authors. The commercial software and own developed numerical formulations have been applied [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The correct implementation of the boundary conditions of heat transfer is an important factor in obtaining the correct computer simulation with the finite element method.…”

Developing continuous-casting-process control based on advanced mathematical modelling

“…Radiation is the prevailing mechanism of heat transfer; however, the heat is partly transported from the strand surface with free or forced convection. 3 Even an abbreviated description of the heat-transfer mechanisms in the steel continuous-casting process indicates two basic difficulties accompanying the mathematical modelling of the process. First, it is impossible to identify every component of the model.…”

“…To illustrate the scale of the problem, the values of the heat-transfer coefficients (HTC) for 12 various models describing the heat transfer in a mould were collected in Table 2. 3,[13][14][15][16][17][18][19][20][21][22][23][24][25] Next, calculations with the specified HTC values were performed, maintaining the constant value of the other process parameters. The obtained calculation results are presented in Table 3.…”

“…The description of the heat-transfer model for the steel continuous-casting process is a complex task as all three heat-transfer mechanisms occur -conduction, radiation and convection [2][3][4] . The following processes impact the heat transfer in the primary zone:…”