Numerical modeling of grade mixing and inclusion entrapment in eight strand billet tundish

Song, Sicheng; Sun, Yanhui; An, Hanghang

doi:10.1051/metal/2023006

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…Research indicates that opting for steel grades with a lower density as the new grade can lead to shorter transition blooms [35]. In this paper, it is assumed that the physical properties of the mixed molten steel flowing from the tundish into the mold remain constant, with the specific parameters detailed in Table 3.…”

Section: Materials Parameters and Simulation Schemesmentioning

confidence: 99%

Numerical Simulation of Macro-Segregation Phenomena in Transition Blooms with Various Carbon Contents

Song,

Sun,

Chen

2024

Metals

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This paper presents a numerical simulation of the steel grade transition from the ladle nozzle to the solidification end of the bloom. The simulation is based on models encompassing fluid flow, solidification, heat transfer, an electromagnetic field, and solute transport. To validate the accuracy of the steel grade transition model, transition blooms of high-carbon steel are sampled. Subsequently, the model is applied to investigating the steel grade transition between medium-carbon steel and low-carbon steel. The findings indicate that the regions exhibiting significant differences between their molten steel flow velocity and bloom casting speed in the strand model are primarily concentrated within 1 m below the meniscus. Additionally, the mushy zone in the strand model possesses a substantial volume. Solute elements continuously permeate the liquid phase from the solid phase through the mushy zone. Consequently, the distribution of solute elements in the transition bloom is primarily influenced by the molten steel flow in the tundish and macro-segregation in the casting process. The segregation degree of each solute element varies among grades with different carbon contents. In the austenite phase, the segregation degree of each element follows the order C > Si > Mo > Mn > Cr > Ni, while in the ferrite phase, the segregation degree is ordered as C > Si = Mn. Considering macro-segregation, the transition bloom partition model proves to be more stringent than the original partition method. This results in longer transition blooms when a significant difference exists between the new and old grades. For example, in Scheme 1, the original plan transition bloom length is 8.88 m, whereas the new plan transition bloom length is 10.88 m. Similarly, in Scheme 2, the original plan transition bloom length is 34.64 m, and the new plan transition bloom length is 35.16 m. Conversely, shorter partition intervals occur when there is an overlap in the composition of the new and old grades. In Scheme 3, the original plan partition interval for the new and old grades is 4.08 m, while the new plan partition interval is reduced to 0.94 m.

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Section: Materials Parameters and Simulation Schemesmentioning

confidence: 99%

Numerical Simulation of Macro-Segregation Phenomena in Transition Blooms with Various Carbon Contents

Song,

Sun,

Chen

2024

Metals

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The Effect of Steel Grade Casting Sequence on the Length of Transition Bloom

Song,

Sun,

Zhou

et al. 2024

Metall Mater Trans B

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Control of macrosegregation at the steel gradient transition by submerged entry nozzle and mold electromagnetic stirring

Song,

Sun,

Wei

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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The limited demand for specialty steel grades, which cannot meet the production quantity of a single-casting sequence in the continuous caster, is addressed through steel grade transition. This study aims to reduce the length of transition blooms generated during the steel grade transition by controlling macrosegregation in the bloom. A three-dimensional numerical simulation of the steel grade transition has been established based on models involving fluid flow, solidification, heat transfer, electromagnetic, and mass transfer. This study takes into account macrosegregation phenomena in the transition bloom that were not considered in previous research. The findings indicate that using a four-port submerged entry nozzle (SEN) and deactivating the mold electromagnetic stirring (M-EMS) can mitigate subcutaneous negative segregation, resulting in shorter transition blooms. The optimal configuration reduces the length of transition blooms by 4.3 m compared to the worst-case scenario. While lowering the casting speed can reduce center segregation, it also extends the mixing time of solute elements in the molten steel. These combined effects lead to a slight increase in the length of the transition bloom, from 10.88 m to 12.41 m. Therefore, for steel grade transition, utilizing a four-port SEN and deactivating the M-EMS can minimize the length of transition blooms, without the need to alter casting speed.

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Numerical modeling of grade mixing and inclusion entrapment in eight strand billet tundish

Cited by 4 publications

References 31 publications

Numerical Simulation of Macro-Segregation Phenomena in Transition Blooms with Various Carbon Contents

Numerical Simulation of Macro-Segregation Phenomena in Transition Blooms with Various Carbon Contents

The Effect of Steel Grade Casting Sequence on the Length of Transition Bloom

Control of macrosegregation at the steel gradient transition by submerged entry nozzle and mold electromagnetic stirring

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