Numerical Simulation of Molten Steel Flow, Heat Transfer and Solidification in Slab Mold Under Composite Magnetic Field

doi:10.12068/j.issn.1005-3026.2024.04.008

Abstract

Abstract:

In view of the merits and the insurmountable technical defects of the electromagnetic stirring （EMS） process and electromagnetic braking （EMBr） process， a split type composite magnetic field combining EMS and EMBr is applied in this paper to control the flow field and temperature field in slab continuous casting mold. In this process， a ruler structure of EMBr is proposed. A three‐dimensional numerical simulation model of the molten steel flow and heat transfer with coupled solidification in slab mold under magnetic field is established. The effect of the composite magnetic field on the molten steel flow， heat transfer and solidification in mold is analyzed. The results show that， after applying the composite magnetic field， the velocities of the upward flow and the downward flow in the mold decrease obviously， the impact depth of the main stream of molten steel on the narrow surface rises， the upward flow moves down slightly as a whole， and the molten steel on the meniscus forms a clockwise circulation flow. The overall temperature distribution in the mold becomes more homogeneous， and the temperature on the meniscus is almost the same as that without magnetic field. The solidified shell at the outlet of the mold is more uniform， and its thickness is increased compared with that without magnetic field. The washing intensity of molten steel jet on the primary solidification shell near the narrow surface is reduced.

Key words: slab continuous casting mold, electromagnetic stirring （EMS）, electromagnetic braking （EMBr）, heat transfer, numerical simulation

CLC Number:

TF 777.1

Ren WEI, Zhi-jian SU, Yi-da DU, Yan-bin WANG. Numerical Simulation of Molten Steel Flow, Heat Transfer and Solidification in Slab Mold Under Composite Magnetic Field[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 514-522.

Figures/Tables 11

Fig.1 Calculation model of the composite magnetic field

Fig.2 Schematic diagram of computing domain grid division and nozzle grids

Table 1 Main calculation parameters

参数	数值
钢液电导率/（S·m^-1）	7.14×10⁵
线圈电导率/（S·m^-1）	6.25×10⁷
拉坯速度/（m·min^-1）	1.6
钢液密度/（kg·m^-3）	7 020
钢液黏度系数/（kg·（m?s）^-1）	0.006 2
电磁搅拌电流/A	400
电磁制动电流/A	400
电磁搅拌频率/Hz	2
钢液凝固潜热/（J·kg^-1）	272 000
钢液比热容/（J·（kg?K）^-1）	720
钢液导热系数/（W·（m·K）^-1）	温度函数
钢液固相线温度/K	1 728
钢液液相线温度/K	1 788

Fig.3 Verification of magnetic field numerical simulation results with experimental measurements

Fig.4 Velocity distribution on wide central vertical section of the mold

Fig.5 Velocity distribution on cross section 10 mm under the meniscus

Fig.6 The temperature distribution contour on the central wide cross section of mold with

Fig.7 Temperature distribution on cross section 10 mm under the meniscus

Fig.8 Change of the shell thickness on narrow face of slab in the mold

Fig.9 The liquid volume fraction at the cross sections 400 mm under the meniscus and outlet of the mold

Fig.10 Thickness of solidified shell at mold outlet with and without composite magnetic field

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