Effects of operating parameters on the flow field in slab continuous casting molds with narrow widths

Zhang, Tao; Yang, Jian; Xu, Gang-jun; Liu, Hongjun; Zhou, Jiahui; Qin, Wei

doi:10.1007/s12613-020-1988-1

Cited by 21 publications

(12 citation statements)

References 22 publications

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“…For the ultra low carbon steel used for producing automobile exposed panels, a high temperature velocity measurement was conducted. In order to measure the velocity near the mold surface more accurately and simply, the rod deflection method was put forward in our previous research [24][25][26][27]. In Figure 1, the velocity measuring device of the rod deflection method is composed of a balance block, deflection bearing, deflection angle indicator and detecting rod.…”

Section: High Temperature Velocity Measurement Methodsmentioning

confidence: 99%

“…The velocities near the mold surface can be quantitatively measured at high temperatures by using this method. For a detailed description of the measuring method of the rod deflection method refer to our previous papers [24][25][26][27]. When the three forces of gravity, buoyancy force and impact force acting on the detecting rod reach a balanced state, the detecting rod leans to a certain deflection angle (θ), the relationship of three forces can be described by the following equation:…”

Section: High Temperature Velocity Measurement Methodsmentioning

confidence: 99%

“…In our previous research studies, the rod deflection method [24] was proposed as a technique to obtain the velocity near the mold surface by measuring the deflection angle of a detecting rod inserted into the liquid steel. With the combination of the measurement of velocity near the mold surface and mathematical modelling, the flow fields in the mold with the narrow width [25] and the medium width [26] were also investigated under the different CC parameters. In this paper, under the different CC parameters of the casting speed, argon gas flow rate, SEN immersion depth and bottom shape, the rod deflection method was used to quantitatively measure the velocity near the surface of the mold at a high temperature.…”

Section: Introductionmentioning

confidence: 99%

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Flow Field in Slab Continuous Casting Mold with Large Width Optimized with High Temperature Quantitative Measurement and Numerical Calculation

Qiao

et al. 2021

Metals

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In this paper, the rod deflection method was applied to quantitatively measure velocity near the mold surface at high temperatures and the k-ε model coupled with a discrete phase model (DPM) was adopted to simulate the flow field in the mold. The calculated results match very well with the measured results under all the present conditions. Under the conditions of the large mold width of 1800 mm, 1.1 m/min casting speed and 140 mm submerged entry nozzle (SEN) immersion depth, the velocity near the mold surface decreases with increasing the argon gas flow rate. When the argon gas flow rate is 6 L/min, the flow pattern is the double roll flow (DRF). When the argon gas flow rate is increased to 10 L/min and 14 L/min, the flow pattern is the single roll flow (SRF), and the risk of slag entrainment increases. With an argon gas flow rate of 10 L/min, and an immersion depth of 160 mm, the velocity near the mold surface sensitively increases with increasing the casting speed. When the casting speed is 1.1 m/min, an intermediate flow (IF) is formed with the intensified mold surface fluctuation, which can easily result in slag entrainment defects. When the casting speed is only increased to 1.2 m/min, the velocity near the mold surface changes drastically and is close to the upper limit velocity of 0.4 m/s. When the casting speed is 1.1 m/min, and the argon gas flow rate is 10 L/min, the velocity near the mold surface is obviously increased with increasing the immersion depth. When the immersion depth of the nozzle increases from 140 mm and 160 mm to 180 mm, the flow pattern changes from SRF or IF to DRF. When the bottom shape of the SEN changes from mountain to well, the velocity near the mold surface decreases. We suggest adopting the well-bottom nozzle to reduce the risk of slag entrainment.

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Section: High Temperature Velocity Measurement Methodsmentioning

confidence: 99%

Section: High Temperature Velocity Measurement Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow Field in Slab Continuous Casting Mold with Large Width Optimized with High Temperature Quantitative Measurement and Numerical Calculation

Qiao

et al. 2021

Metals

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“…Generally, since the width of the slab mold used for different widths of automobile exposed panels is also different, it is necessary to optimize the mold flow fields of different widths to improve the surface quality of automobile exposed panels with various widths. In view of the characteristics of the flow fields in the mold with different widths, in our recent works [18][19][20], the flow fields of slab molds with narrow, medium, and wide widths have been studied through rod deflection high-temperature measurement combined with numerical simulation. For the narrow width [18], increasing casting speed increases the subsurface velocity of molten steel and shifts down the position of the vortex core in the downward circulation zone.…”

Section: Introductionmentioning

confidence: 99%

“…In view of the characteristics of the flow fields in the mold with different widths, in our recent works [18][19][20], the flow fields of slab molds with narrow, medium, and wide widths have been studied through rod deflection high-temperature measurement combined with numerical simulation. For the narrow width [18], increasing casting speed increases the subsurface velocity of molten steel and shifts down the position of the vortex core in the downward circulation zone. For the medium width [19], when the casting speed is increased from 1.0 to 1.3, 1.5, and 2.0 m/min, the flow pattern in the mold changes from SRF to unstable flow (UF) and then to DRF.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mold Width on the Flow Field in a Slab Continuous-Casting Mold with High-Temperature Velocity Measurement and Numerical Simulation

Liu

Yang

et al. 2021

Metals

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In this paper, the effects of the width of the mold on the surface velocity, flow field pattern, turbulent kinetic energy distribution, and surface-level fluctuation in the mold were studied with measurement of the flow velocity near the surface of the mold at high temperature with the rod deflection method and numerical calculation with the standard k-ε model coupled with the discrete-phase model (DPM) model for automobile exposed panel production. Under the conditions of low fixed steel throughput of 2.2 ton/min, a nozzle immersion depth of 140 mm, and an argon gas flow rate of 4 L/min, as the width of the mold increases from 880 mm to 1050 mm and 1300 mm, the flow velocity near the surface of the mold decreases. The flow direction changes from the positive velocity with the mold widths of 880 mm and 1050 mm to the unstable velocity with the mold width of 1300 mm. The calculated results are in good agreement with the measured results. The turbulent kinetic energy near the submerged entry nozzle (SEN) gradually increases, and the risk of slag entrainment increases. Under the conditions of high fixed steel throughput of 3.5 ton/min, the SEN immersion depth of 160 mm, and the argon gas flow rate of 10 L/min, as the width of the mold increases from 1600 mm to 1800 mm and 2000 mm, the velocity near the mold surface decreases. The flow velocity at 1/4 of the surface of the mold is positive with the mold width of 1600 mm, while the velocities are negative with the widths of 1800 mm and 2000 mm. The calculated results are basically consistent with the measured results. The high turbulent kinetic energy area near the nozzle expands to a narrow wall, and the risk of slag entrainment is significantly increased. In both cases of low and high fixed steel throughput, the change rules of the flow field in the mold with the width are basically the same. The argon gas flow rate and the immersion depth of SEN should be adjusted reasonably to optimize the flow field in the mold with different widths under the same fixed steel throughput in the practical production.

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Optimization of Port Angle for Narrow‐Width Mold Flow Field under High Casting Speed Based on Large Eddy Simulation and High‐Temperature Measurement of Velocity

Guo,

Yang,

Liu

2023

steel research int.

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This article studies the flow field of the mold through numerical simulation and high‐temperature measurement, and discusses the effects of casting speed and port angle on the flow field of the 880 mm wide mold. The velocities near the mold surface of the numerical simulation are in good agreement with those of the high‐temperature measurement. As the casting speed continues to increase, the surface flow velocity of the mold also increases. When the casting speed increases to 1.8 m/min, the flow pattern of the mold exhibits a strong Double‐Roll Flow (DRF), the strong jet increases the risk of argon bubbles being captured by the solidification front inside the mold. As the port angle of the submerged entry nozzle (SEN) gradually increases, the surface flow velocity of the mold gradually decreases. By appropriately increasing the port angle of the SEN to 20°, the surface flow velocity of the mold decreases, and the stability of the molten steel‐slag interface improves. At the same time, there is no significant change in the distribution of argon bubbles, and the removal rate of inclusions is the highest.This article is protected by copyright. All rights reserved.

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Effects of operating parameters on the flow field in slab continuous casting molds with narrow widths

Cited by 21 publications

References 22 publications

Flow Field in Slab Continuous Casting Mold with Large Width Optimized with High Temperature Quantitative Measurement and Numerical Calculation

Flow Field in Slab Continuous Casting Mold with Large Width Optimized with High Temperature Quantitative Measurement and Numerical Calculation

Effect of Mold Width on the Flow Field in a Slab Continuous-Casting Mold with High-Temperature Velocity Measurement and Numerical Simulation

Optimization of Port Angle for Narrow‐Width Mold Flow Field under High Casting Speed Based on Large Eddy Simulation and High‐Temperature Measurement of Velocity

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