Internal Defects of Continuous Casting Slabs Caused by Asymmetric Unbalanced Steel Flow in Mold

Miki, Yuji; Takeuchi, Shuji

doi:10.2355/isijinternational.43.1548

Cited by 98 publications

(65 citation statements)

References 7 publications

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“…It usually enters the continuous casting mold after injection into the submerged entry nozzle (SEN), and a lot of large bubbles will be safely escape from the top surface, but some smaller bubbles (surrounded by inclusions) either be harmfully entrapped in the shell, at the solid/liquid interface of the solidifying metal, [1][2][3][4] causing pinhole defects, as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the argon bubbles on the steel flow pattern was neglected, so the results only apply to low argon flow rates. Miki et al 1,8) used the dispersed phase model (DPM) to study the mechanism of bubbles entrapment and influence of gas bubbles on the steel flow, and the large eddy simulation was used to simulate the transient flow. Li et al 9,10) employed a homogeneous fluid model with variable density to tackle the molten steelargon gas flow, considering the static magnetic-field application in the continuous casting process.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Transient Two-Phase Flow in a Continuous Casting Mold Using Euler-Euler Large Eddy Simulation Scheme

Liu

Jiang

et al. 2013

ISIJ Int.

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Euler-Euler Large Eddy Simulation (EELES) scheme has been developed to simulate the two-phase flow of argon gas and molten steel in slab continuous casting mold. The Euler-Euler approach is used to describe the equations of motion of the two-phase flow. The drag force, lift force and virtual mass force are incorporated in this model. Both turbulence of argon gas and molten steel are simulated using large eddy simulation (LES). Simulation results agree acceptably well with the water model experimental measurements of instantaneous flow structures. The flow pattern in the lower recirculation zone is expected to be asymmetrical between the left and right sides of the mold. The flow pattern is changeover; the direction of flow deviation is different from time to time. The time intervals for changeover appeared to vary randomly. The long-term asymmetry in the lower roll is due to the turbulent nature instead of the variation of other operating parameters. The turbulent flow in the mold includes multiple vortices. Those vortexes make the flow field to be more complex. Two typical transient flow structures, consisting of clockwise or counterclockwise rotational direction vortices, are found in the upper roll.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Transient Two-Phase Flow in a Continuous Casting Mold Using Euler-Euler Large Eddy Simulation Scheme

Liu

Jiang

et al. 2013

ISIJ Int.

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“…An example of a bubble with attached inclusions is shown in Figure 22. [92,93] Zhang and Taniguchi published an extensive literature review [94,95] and water model study [96] on the interaction between inclusions and bubbles in molten steel.…”

Section: Defects In Ingot Steel Productsmentioning

confidence: 99%

“…22-Inclusions outlining the former surface of bubbles captured in ingot steel (left) [93] and in continuous cast steel (right). [92] Air is the most common source of reoxidation, which can enter ingot steel in many ways. (1) Molten steel mixes with air during teeming due to the strong turbulence.…”

Section: A Reoxidation Mechanismsmentioning

confidence: 99%

State of the art in the control of inclusions during steel ingot casting

Zhang

Thomas

2006

Metall Mater Trans B

241

129

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This article extensively reviews published research on inclusions in ingot steel and defects on ingot products, methods to measure and detect inclusions in steel, the causes of exogenous inclusions, and the transport and entrapment of inclusions during fluid flow, segregation, and solidification of steel cast in ingot molds. Exogenous inclusions in ingots originate mainly from reoxidation of the molten steel, slag entrapment, and lining erosion, which are detailed in this article. The measures to prevent the formation of exogenous inclusions and improve their removal are provided, which are very useful for the clean steel production of ingot industries.

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“…But blowing argon gas also affected flow characteristic of liquid steel in mold especially when a asymmetric unbalanced flow happened. 1,2) Argon bubble captured by solidified shell were key sources of defects after rolling, such as pencil blister and sliver; inclusions often accompanied with the bubbles during the continuous casting process and also some inclusions attached on the bubbles can remove by bubble floatation. [3][4][5] Abbel et al reported that large argon bubbles (diameter >0.5 mm) had a nonhomogeneous distribution in slab in respect width and depth based on radiographic method.…”

Section: Introductionmentioning

confidence: 99%

Distribution and Detriment of Bubbles in Continuous Casting Interstitial Free Steel Slab

et al. 2015

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The distribution and detriment of bubbles in ultra low carbon interstitial free steel were studied by X-ray radiographic and cold-rolled experiment; a total of 24 pieces samples with size 230 mm × 65 mm × 2 mm were detection and 150 bubbles were counted; the results showed that: (1) Two bubbles bands formed in continuous casing slab; bubbles distributed asymmetrically in thickness direction of the slab; small bubbles mainly concentrated in inner art side 1/8 to 1/4 in thickness direction; large bubbles were main in center of the slab in thickness direction; (2) Hundreds of inclusions with sizes 2 μm to 10 μm accumulated in cone-shape region after bubbles. Inclusions or Fe and FeO particles often attached or mixed with the bubbles. (3) Small bubbles entered into down-flow easily and rushed out the mould, bubbles and inclusions accumulative band formed in inner art side of the slab. (4) The bubbles, inclusions around the bubbles or large Fe and FeO particles mixing with bubbles became source of the sliver defect.

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Internal Defects of Continuous Casting Slabs Caused by Asymmetric Unbalanced Steel Flow in Mold

Cited by 98 publications

References 7 publications

Modeling of Transient Two-Phase Flow in a Continuous Casting Mold Using Euler-Euler Large Eddy Simulation Scheme

Modeling of Transient Two-Phase Flow in a Continuous Casting Mold Using Euler-Euler Large Eddy Simulation Scheme

State of the art in the control of inclusions during steel ingot casting

Distribution and Detriment of Bubbles in Continuous Casting Interstitial Free Steel Slab

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