Optimisation of Electromagnetic Stirring in Steel Billet Caster by Using Image Processing Technique for Improvement in Billet Quality

Sahoo, P. P.; Kumar, Ashutosh; Halder, J; Raj, Manish

doi:10.2355/isijinternational.49.521

Cited by 42 publications

(29 citation statements)

References 7 publications

(7 reference statements)

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“…[2,4,5,10,[17][18][19][20][21][22] However, only one previous research reported data on the deflection angle under the influence of M-EMS. In that work, [23] it is indicated that the deflection angle is effected by the solute and temperature gradients induced by fluid flow not by the EM force directly and 60 pct of the imposed electromagnetic force disappears due to the interaction of 3D flow, for example, from the submerged entry nozzle.…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Deflection Angle of Columnar Dendrites of Continuous Casting Steel Billets Under the Influence of Mold Electromagnetic Stirring

Wang

Zhang

et al. 2016

Metall Mater Trans A

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In the current study, the deflection angle of columnar dendrites on the cross section of steel billets under mold electromagnetic stirring (M-EMS) was observed. A mathematical model was developed to define the effect of M-EMS on fluid flow and then to analyze the relationship between flow velocities and deflection angle. The model was validated using experimental data that was measured with a Tesla meter on magnetic intensity. By coupling the numerical results with the experimental data, it was possible to define a relationship between the velocities of the fluid with the deflection angle of high-carbon steel. The deflection angle of high-carbon steel reached maximum values from 18 to 23 deg for a velocity from 0.35 to 0.40 m/s. The deflection angles of low-carbon steel under different EM parameters were discussed. The deflection angle of low-carbon steel was increased as the magnetic intensity, EM force, and velocity of molten steel increased.

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Section: Introductionmentioning

confidence: 99%

Analysis on the Deflection Angle of Columnar Dendrites of Continuous Casting Steel Billets Under the Influence of Mold Electromagnetic Stirring

Wang

Zhang

et al. 2016

Metall Mater Trans A

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“…There are many inspection systems, but machine visionbased surface defect detection has been applied widely in steel production 2) because this approach is advantageous in terms of its repeatability, consistency, and costs. A number of machine vision-based methods have been proposed to improve steel quality and the efficiency of manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Detection of Scarfing Faults on the Edges of Slabs

et al. 2014

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At present, quality control is becoming a major issue in steel production. Thus we developed an algorithm that uses machine vision to detect scarfing faults on slabs, which impairs the steel quality of subsequent products such as steel plates. Scarfing faults typically occur in three locations: the top, middle, and edge of the slab. Our proposed algorithm is focused on detecting scarfing faults on the edge of slab, which is tiny and sometimes indistinct. A machine vision system with a line scan camera was designed, which facilitates the detection of brightness differences and texture differences between well-scarfed and poorly-scarfed slab surface. Scarfing faults are tiny on the edges, so we propose a new segmentation method that takes advantage of capabilities of the line scan camera. A segmented image is filtered using Gabor filters, which were designed to focus on the boundary with scarfing faults to identify specific regions with defect, referred to as defect candidates. Each defect candidate is classified using a Support Vector Machine (SVM) classifier based on its extracted features. Our proposed algorithm was effective according to the experimental trials using 2 061 frame images acquired from real samples, where the true detection rate was 97.26% and the false detection rate was 1.66%. Our proposed system and algorithm based on machine vision technology facilitates scarfing faults detection, which can be detected before rolling process, resulting in improved steel quality.

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“…The relation between the maximum electromagnetic force and the imposed current is plotted in Figure 3(a). According to the electromagnetic theory, 1) the Lorentz force F is directly proportional to B 2 , and BϰI (stirring current). Therefore, the Lorentz force is proportional to I 2 , i.e., FϰI 2 .…”

Section: Numerical Investigationmentioning

confidence: 99%

“…By controlling the M-EMS current and frequency, stirring intensity in the liquid pool can be controlled. A number of researchers [1][2][3][4][5][6][7][8][9] found that M-EMS reduces center porosity, shrinkage cavity and macro-segregation, and that it removes non-metallic inclusions in the mold owing to centripetal force.…”

Section: Introductionmentioning

confidence: 99%

Shield for Improving Wavy Meniscus in the Billet Continuous Casting Mold with Electromagnetic Stirring

2010

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An electromagnetic shield was developed to improve the wavy meniscus profile in billet continuous casting with in-mold electromagnetic stirring (M-EMS). The characteristics of this shield were investigated through coupled simulation of the electromagnetic and the flow field. These numerical studies found that the designed shield decreases the electromagnetic force near the meniscus to 50 % whereas that in the M-EMS core region is reduced about 18 %. The designed shield was applied in the real billet caster with M-EMS. The imposed current was increased to compensate the reduced electromagnetic force near the M-EMS core. A close inspection of the produced billets found that the proposed shield greatly reduces the meniscus height even in the case of a stronger rotation flow in the mold.KEY WORDS: electromagnetic stirring; EMS; billet; continuous casting; shield; mold level fluctuation. Fig. 1. M-EMS system for the billet continuous caster.

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Optimisation of Electromagnetic Stirring in Steel Billet Caster by Using Image Processing Technique for Improvement in Billet Quality

Abstract: Fig. 1. Schematic diagram of billet sample (cross section 130ϫ130) collected for ultrasonic C scan testing.

Cited by 42 publications

References 7 publications

Analysis on the Deflection Angle of Columnar Dendrites of Continuous Casting Steel Billets Under the Influence of Mold Electromagnetic Stirring

Analysis on the Deflection Angle of Columnar Dendrites of Continuous Casting Steel Billets Under the Influence of Mold Electromagnetic Stirring

Detection of Scarfing Faults on the Edges of Slabs

Shield for Improving Wavy Meniscus in the Billet Continuous Casting Mold with Electromagnetic Stirring

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