Influence of Mold Flux Basicity on Surface Quality of Ultra-low Carbon Steel Slabs

Hanao, Masahito; Kawamoto, Masayuki

doi:10.2355/isijinternational.48.1210

Cited by 10 publications

(9 citation statements)

References 7 publications

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“…Basicity − which in its simplest form is defined as the mass percent ratio of total CaO to SiO 2 (a valid expression for slags containig apreciable quantities of these oxides) − is also given in Table , as an useful indicative of the slag depolymerization degree.…”

Section: Methodsmentioning

confidence: 99%

Solidification Behavior of CaO–SiO₂–Al₂O₃ Mold Fluxes Containing MgO and Low TiO₂ Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis

Silva

Vilela

Heck

et al. 2017

steel research int.

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The effect of MgO and low TiO 2 content on the solidification of CaO-SiO 2 -Al 2 O 3 based mold fluxes is investigated. The crystallization and viscosity behaviors are analyzed using single hot thermocouple technique (SHTT) and rotating viscometer, respectively. Continuous-cooling-transformation (CCT) results point to an increase of critical cooling rate (CCR) with increasing MgO content. Conversely, the presence of TiO 2 seems to mitigate the effect of MgO on the crystallization due to the strong glass former characteristic of titanium dioxide. Viscosity measurements show an increase with increasing MgO content in slags containing TiO 2 . Break temperatures (T br ) are compared to the onset crystallization temperatures from CCT experiments. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis results indicate the presence of melilite (Al 2 Ca 2 Mg 0.5 O 7 Si 1.5 ) for all samples of mold flux containing both MgO and TiO 2 .

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Section: Methodsmentioning

confidence: 99%

Solidification Behavior of CaO–SiO₂–Al₂O₃ Mold Fluxes Containing MgO and Low TiO₂ Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis

Silva

Vilela

Heck

et al. 2017

steel research int.

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“…process (online version in color) Previously, surface defects in cold-rolled ultra-low carbon steel by inclusions aroused great attentions. [28][29][30][31][32][33][34][35][36] From these studies, it was known that large inclusions should be avoided as much as possible. Emi et al and Ikeda et al pointed out that the safe size of an inclusion in slab to avoid surface defect in cold-rolled coils and deep-drawn ironed (DI) cans should be ≤240 μm and ≤50 μm, respectively.…”

Section: (2) Inclusions In As-cast Slabmentioning

confidence: 99%

Optimal Control of Inclusions to Prevent “Sand-Hole” Surface Defects in Deep Cold-Drawn Battery Cups for Electrical Vehicles

et al. 2023

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The present work was conducted to elucidate the influence of inclusionson surface quality of deep cold-drawn battery cups for electrical cars. The obtained results revealed that, to prevent the surface defects of sand-holes in battery cups in deep cold-drawing process, attentions should be paid to steelmaking and casting process for optimal control of inclusions. Because sand-holes were often caused by large Al 2 O 3 clusters and CaO-Al 2 O 3 particles. Most important, a worthy finding was that these inclusions were not safe when they were over 100 μm and bigger than 27 μm, respectively, which was important for process optimization. By reducing (FeO) contents in ladle slag and tundish covering flux to about 5% or lower, together with optimal fluid flow of molten steel in tundish, such large inclusions can be well decreased to prevent the occurrences of sand-holes in battery cups in industrial production.

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“…It is reported that the slag entrapment probability will be minimized by improving the surface tension of molten slag. [100,101] Al 2 O 3 can increase surface tension of molten slags, which is different from SiO 2 . [102,103] Thereupon, there exists a possibility that a CaO-Al 2 O 3based slag system with high surface tension, of which other properties are equivalent to the CaO-SiO 2 system, can be obtained to reduce slag entrapment during continuous casting.…”

Section: Mold Fluxes With Low Sio 2 Contentmentioning

confidence: 99%

“…In addition to investigations on properties of mold fluxes, it is noteworthy that with the increase of casting speed, meniscus fluctuations in the mold easily provoke slag entrapment, which causes surface defects and subsurface inclusions of strands. It is reported that the slag entrapment probability will be minimized by improving the surface tension of molten slag . Al 2 O 3 can increase surface tension of molten slags, which is different from SiO 2 .…”

Section: Development Status Of Mold Fluxes For Continuous Casting Of mentioning

confidence: 99%

Review of Mold Fluxes for Continuous Casting of High‐Alloy (Al, Mn, Ti) Steels

Chen

et al. 2018

steel research int.

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During continuous casting of high‐alloy (Al, Mn, Ti) steels, the operational issues and quality problems caused by interfacial reaction or peritectic features need to be solved by applying suitable mold fluxes. Intensive efforts have been made to optimize properties, and hereby, several types of mold fluxes, including mold fluxes with high basicity and high glassy property (dual‐high mold fluxes), mold fluxes with strong oxidizing components to protect SiO2 from reduction, mold fluxes with high SiO2 content to decrease the viscosity and basicity, mold fluxes with low SiO2 content for the purpose of attenuated reactivity, and molten mold fluxes to increase consumption, have been developed. Significant efforts have been made to study the theoretical basis and practical application of these mold fluxes. To summarize, the most potential solution of mold fluxes for high‐alloy (Al, Mn, Ti) steel continuous casting is to further optimize the nonreactive mold fluxes systematically to achieve a coordinated control of lubrication and heat transfer.

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Influence of Mold Flux Basicity on Surface Quality of Ultra-low Carbon Steel Slabs

Cited by 10 publications

References 7 publications

Solidification Behavior of CaO–SiO₂–Al₂O₃ Mold Fluxes Containing MgO and Low TiO₂ Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis

Solidification Behavior of CaO–SiO₂–Al₂O₃ Mold Fluxes Containing MgO and Low TiO₂ Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis

Optimal Control of Inclusions to Prevent “Sand-Hole” Surface Defects in Deep Cold-Drawn Battery Cups for Electrical Vehicles

Review of Mold Fluxes for Continuous Casting of High‐Alloy (Al, Mn, Ti) Steels

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Influence of Mold Flux Basicity on Surface Quality of Ultra-low Carbon Steel Slabs

Cited by 10 publications

References 7 publications

Solidification Behavior of CaO–SiO2–Al2O3 Mold Fluxes Containing MgO and Low TiO2 Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis

Solidification Behavior of CaO–SiO2–Al2O3 Mold Fluxes Containing MgO and Low TiO2 Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis

Optimal Control of Inclusions to Prevent “Sand-Hole” Surface Defects in Deep Cold-Drawn Battery Cups for Electrical Vehicles

Review of Mold Fluxes for Continuous Casting of High‐Alloy (Al, Mn, Ti) Steels

Contact Info

Product

Resources

About

Solidification Behavior of CaO–SiO₂–Al₂O₃ Mold Fluxes Containing MgO and Low TiO₂ Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis

Solidification Behavior of CaO–SiO₂–Al₂O₃ Mold Fluxes Containing MgO and Low TiO₂ Content Using Single Hot Thermocouple Technique (SHTT): Continuous‐Cooling‐Transformation (CCT) and Viscosity Analysis