Thermal-Fluid Dynamic Behavior on Intermixed Steel Calculation during a Grade Change in a Slab Tundish by Numerical Simulation

Figueroa-Fierros, Aldo Emmanuel; Ramos-Banderas, José Ángel; Hernández-Bocanegra, Constantin Alberto; López-Granados, Nancy Margarita; Solorio-Díaz, Gildardo

doi:10.2355/isijinternational.isijint-2023-328

Cited by 1 publication

(1 citation statement)

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“…This allows the treatment of new a old grades as separate components to study the steel grade transition in the tundish. T numerical simulations of the tundish flow field [19][20][21][22][23][24][25] and numerical simulations of F-EMS electromagnetic field [26][27][28][29][30] have become relatively mature. This paper does delve further into the modeling process for the tundish steel grade transition and F-EM The steel grade transition of a bloom encompasses various intricate physical p nomena, including fluid flow, heat transfer, solidification, an electromagnetic field, a solute transport.…”

Section: Simulation Model 21 Model Description and Assumptionsmentioning

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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