Effect of Mold Electromagnetic Stirring and Final Electromagnetic Stirring on the Solidification Structure and Macrosegregation in Bloom Continuous Casting

Wang, Yadong; Zhang, Lifeng; Yang, Wen; Ji, Sha; Ren, Ying

doi:10.1002/srin.202000661

Cited by 38 publications

(22 citation statements)

References 27 publications

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“…Electromagnetic stirring at solidification end [23] Increases the number of equiaxed crystals in liquid cavities ensures the composition uniformity of liquid steel and decreases the macro-segregation.…”

Section: Advantage Shortcomingmentioning

confidence: 99%

Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Nian

Zhang

et al. 2022

Processes

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Continuous casting is a dominant steelmaking process due to its steady-state nature, enhanced yield of steel production, and low consumption of energy and manpower. However, the production of defect-free cast products is still a big challenge, as the internal defects, including macro-segregation of alloying elements, cracks, and pores, can be easily formed during the solidification process, which seriously deteriorates the microstructure and mechanical properties of the cast products. Therefore, this paper puts forward the common solutions to overcome these problematic issues. The reduction technology can effectively improve the center segregation of the billet, bloom, and slab. The history of the development of the reduction technology is summarized and classified according to the variations in research trend. Furthermore, the basic principles and parameters of reduction technology are described to implement them in the actual production process. This paper compares the similarities and differences between soft reduction (SR) and heavy reduction (HR) technologies with a particular focus on the theoretical research of HR technology and further elaborates the key parameter and equipment problems during implementation of HR. Moreover, this paper also considers the HR technology adopted by Baosteel as a case study, which helped to put forward some viewpoints for the future development of reduction technology.

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Section: Advantage Shortcomingmentioning

confidence: 99%

Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Nian

Zhang

et al. 2022

Processes

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“…To decrease these internal defects, various methods have been proposed for the continuous casting of high‐carbon steels. Low superheat with controlled casting speed, [ 11 ] electromagnetic stirring (EMS), [ 5,12–14 ] thermal soft reduction (TSR), [ 15 ] and mechanical soft reduction (MSR) [ 14,16–18 ] are the most widely used ones. Among these methods, low superheat with controlled casting speed, which favors a structure with high proportion of equiaxed dendrites and low possibility of miniingotism, provides a simple low‐cost solution to controlling the internal quality of the strand, especially segregation in a macroscopic center area of the cast section.…”

Section: Introductionmentioning

confidence: 99%

Development of a Novel Strand Reduction Technology for the Continuous Casting of Homogeneous High‐Carbon Steel Billet

Gao

Bao

Wang³

et al. 2023

steel research int.

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Internal quality issues concerning center segregation, porosity, and internal crack are the major problems with respect to the production of high‐carbon steels billet with a continuous casting process. Herein, a heat transfer calculation model is developed, verified, and applied to calculate the appropriate casting speed and secondary cooling intensity of the continuous casting billet with a section size of 160 mm square during mechanical reduction processes. The mechanical reduction on the homogeneity of the billet is investigated by several field trails to improve the internal quality of the high‐carbon 82 A steel billet. Consequently, a superoptimum crack‐free high‐carbon steel billet with high homogeneity both in segregation and in compactness is successfully achieved through a novel strand reduction pattern, combined with consecutive multiroll soft reduction and single‐roll heavy reduction.

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“…The formation mechanisms of center segregation have been investigated by many researchers. [3][4][5][6][7] The low superheat casting, [8][9][10] electromagnetic stirring, [11][12][13][14] and mechanical reduction [15][16][17][18] were proposed to reduce the center segregation defect in the continuous casting. However, the influence of RGD [19,20] on solute redistribution is less studied, even though it is commonly observed in the continuous caster.…”

Section: Introductionmentioning

confidence: 99%

Roll‐Gap Deviation on Centerline Segregation Evolution in Continuous Casting Slab

Jiang

Zhu

Zhang

2023

steel research int.

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Roll‐gap deviation (RGD) is commonly observed in the slab continuous caster, which means the thicknesses of the right and left sides are different. The RGD amounts and positions on the solute redistribution are investigated. In the RGD zone, slab thickness decreases from the left to the right side. Dynamic grid technology is used to consider the mesh deformation in the model. When RGD is set before the solidification end of the slab middle part, the center segregation in the right‐edge part decreases but that in the left‐edge part increases. That is because the solute‐enriched liquid moves from the right to the left side with solid compression. When RGD is set after the slab middle part is solidified, the center segregation in the right‐edge part is deteriorated, while that in the left‐edge part is reduced. This is because the slab right‐edge part is fully solidified in the RGD zone, and the segregation cannot be reduced in the later stage. With the RGD position moving from 15.5 to 18.0 m from the meniscus, the center segregation in the right‐edge part decreases first and then increases, while that in the left‐edge part increases slightly and then declines.

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Effect of Mold Electromagnetic Stirring and Final Electromagnetic Stirring on the Solidification Structure and Macrosegregation in Bloom Continuous Casting

Cited by 38 publications

References 27 publications

Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Development of a Novel Strand Reduction Technology for the Continuous Casting of Homogeneous High‐Carbon Steel Billet

Roll‐Gap Deviation on Centerline Segregation Evolution in Continuous Casting Slab

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