Mould Powder Development for Continuous Casting of Steel

Kromhout, J. A.

doi:10.1007/s12666-013-0296-0

Cited by 17 publications

(10 citation statements)

References 15 publications

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“…Then, the temperature and heat flux measured by the embed thermocouples would jump, which indicates the breakout in the mold occurring. While, if the jet impinging on the shell is cold in the vicinity of meniscus, it would cause the meniscus freezing, and results in a larger slag rim and deeper hooks …”

Section: Fluid Flow Versus Heat Transfermentioning

confidence: 99%

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Wang

Zhu

Zhou

2017

steel research int.

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The initial solidification of molten steel in the mold is very important, as it is the origin of the final slab, which associates with the surface defects and determines the final quality of casting slab. In this article, six main topics, including the initial solidification study method, molten steel solidification, mold flux structure, fluid flow, oscillation marks formation, and breakout are reviewed with the purpose to explore the intrinsic mechanism of the complex initial solidification process and its related multi-phase heat transfer phenomena. The results summarized here can provide a foundational understanding of the initial solidification and heat transfer phenomena occurring in the continuous casting mold.

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Section: Fluid Flow Versus Heat Transfermentioning

confidence: 99%

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Wang

Zhu

Zhou

2017

steel research int.

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“…[13] As for which idea is suitable for HNSS, it needs to match the hightemperature solidification characteristics of steel to achieve a good use effect. [14][15][16] However, the high-temperature solidification characteristics of HNSS have yet to be reported, and there need to be more references regarding the design of mold powder. The hightemperature solidification characteristics of steel grades can be understood in two ways.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Mold Powders for High‐Nitrogen Stainless Steel Based on Mold Thermocouple Temperature Variation

Chen

Wen

Tang

et al. 2023

steel research int.

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High‐nitrogen stainless steel (HNSS) is prone to surface depression during continuous casting; however, its high‐temperature solidification characteristics and mold powder design have not been reported. Based on the analysis of mold thermocouple temperature variation, this study clarifies the high‐temperature solidification characteristics of HNSS and the cause of surface depression. It optimizes the mold powder for HNSS continuous casting according to factory and laboratory research. The factory trials indicate that the mold thermocouple temperature at the corresponding location decreases by 6.0–20.9 °C when the slab surface is depressed. The analysis shows that the high initial solidification strength of HNSS causes its slab surface depressions. Owing to this characteristic, the mold powder for HNSS should have a suitable melting rate, low basicity, and proper Al2O3. This low‐basicity Al2O3‐containing slag has a crystal slag film near the mold side and a thick liquid slag film near the slab. It can both provide good lubrication and control horizontal heat transfer.

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“…Further, with the increase in casting speed and the special funnel shape of the mould, the heat transfer and solidification conditions of the thin slab in the mould are greatly affected, including the thinning and deformation of the shell, an increase in thermal shock caused by the increase in heat flow, the difficulty of liquid slag inflow and a decrease in mould flux consumption, and the thinning and uneven distribution of slag film thickness [7][8][9]. These changes increase the friction between the mould and the slab, and the shell grows unevenly, which may eventually lead to sticking breakout and surface cracks [10,11]. In summary, if there is a type of mould flux that can reduce the viscosity with the increase in shear rate to ensure rapid melting, it can maintain relatively high viscosity in the area of the steel surface with low shear rate (10-40 s −1 ) to reduce the risk of slag entrapment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al₂O₃ on shear-thinning property of mould flux for high-speed thin slab continuous casting and its study on the mechanism

Yuan

Zhu

2021

Ironmaking & Steelmaking

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To solve the problems of slag entrapment risk and frequent bond alarm in the field application of mould flux for high-speed thin slab continuous casting, the idea of 'non-Newtonian fluid mould flux with shear-thinning property' is introduced. It was found that with an increase in the Al 2 O 3 content, the shear-thinning behaviour of the mould flux first increased and then decreased. The sample with 8.61% Al 2 O 3 content had the strongest shear-thinning property and the lowest fluidity index, which reached 0.75. With the addition of Al 2 O 3 , the degree of polymerization of the mould flux molecules increased, and the relative strength of the Si-O-Al bond increased. It was found that the Al 2 O 3 content has a significant influence on the IV Al complexes. The XPS results showed that Q 3 (1Al) was the structural unit most easily affected by shear stress, and the higher the content of Q 3 (1Al), the stronger the shear-thinning property of the mould flux.

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Mould Powder Development for Continuous Casting of Steel

Cited by 17 publications

References 15 publications

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Optimization of Mold Powders for High‐Nitrogen Stainless Steel Based on Mold Thermocouple Temperature Variation

Effect of Al₂O₃ on shear-thinning property of mould flux for high-speed thin slab continuous casting and its study on the mechanism

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Mould Powder Development for Continuous Casting of Steel

Cited by 17 publications

References 15 publications

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Optimization of Mold Powders for High‐Nitrogen Stainless Steel Based on Mold Thermocouple Temperature Variation

Effect of Al2O3 on shear-thinning property of mould flux for high-speed thin slab continuous casting and its study on the mechanism

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Effect of Al₂O₃ on shear-thinning property of mould flux for high-speed thin slab continuous casting and its study on the mechanism