Study on the Spatial Distribution of Argon Bubbles in a Steel Slab Continuous Casting Strand

Abstract

Research data are not shared.

Numerical Simulation of Flow and Argon Bubble Distribution in a Continuous Casting Slab Mold under Different Argon Injection Modes

“…Figure 3 shows the bubble distribution within the mold at the casting speed of 0.63 m/min and argon flow rate of 0.638 L/min at the SEN. It can be seen that most of the bubbles floated near the SEN, especially the large bubbles, while the small bubbles moved along with the jet flow to the narrow face because of the effect of buoyancy, which is consistent with the flow characteristics calculated by Zhang [21] and Yang [28]. The bubble diameters within the mold obtained by the current model are shown in Figure 3b, which indicates that both the distribution and penetrating depth of argon bubbles agree well with the experiment.…”

“…The results indicated that the proportion of large bubbles and average bubble diameter in the upper recirculation zone decreased with the increment of water flow rate and increased with the increment of gas flow rate. Meanwhile, similar conclusions were also reached by Zhang [21]: it was confirmed that increasing argon gas flow rate promotes bubble breakage, and increasing casting speed promotes bubble coalescence. The aforementioned study has great significance in understanding the flow pattern and bubble distribution within a mold under argon injection; however, most of these works injected the argon through the top of the SEN inlet.…”

“…The Euler-Euler model was applied and the argon bubble was treated as a continuous phase. In order to investigate the bubble breakage and coalescence behavior, the PBM was adopted, where the bubble size ranged from 0 mm to 6 mm with 11 size groups [21]. The initial bubble diameter entering the calculation domain was 2 mm.…”

Effects of Submerged Entry Nozzle Bottom Shape on the Size Distribution of Argon Bubbles in a Steel Continuous Casting Slab Strand Using Multiple‐Size‐Group Approach

“…[33,34] For the gas injection method, it can also offset the pressure drop in the SEN and reduce the reoxidation of the molten steel caused by the nozzle suction. The behavior of argon bubbles has been widely studied inside the CC mold at different casting parameters, including the casting speed, [35,36] argon flow rate, [37][38][39] and submergence depth of the SEN. [40] Recent studies on the bubbly flow inside the SEN are summarized in Table 1, including investigations performed by the physical modeling, mathematical modeling, and industrial trials. However, the effect of the SEN bottom shape on the size distribution of argon bubbles was rarely studied.…”

Effect of casting speed on solidification and inclusion motions in bloom mold caster under the influence of in-mold electromagnetic stirring

“…Many researchers (Li et al , 2020; Liu and Li, 2018; Zhang et al , 2006) have recognized that metal flow in the mold is a major aspect influencing the quality of continuously cast products. The flow pattern of the mold is influenced by various process parameters such as nozzle shape, nozzle submergence depth (Ma et al , 2021), argon gas injection rate (Liu et al , 2022; Yin and Zhang, 2022) and casting speed. Additionally, it has been found that electromagnetic (EM) forces can instant alter the flow pattern, enhancing the microstructure of material and assisting in removing impurities from molten steel.…”