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

Steel Research International(2021)SCI 2区SCI 3区

Yanshan Univ | Shougang Grp Co Ltd

Cited 8|Views12
Abstract
The spatial distribution of argon bubbles in an 1800 mm × 230 mm continuous casting strand under different casting speeds and argon flow rates are studied through the numerical simulation using the Euler–Euler‐multiple‐size‐group approach. The calculated fluid flow is validated with water modeling and nail board measurements of industrial trials. Argon bubbles with diameter of 2 mm are injected into the submerged entry nozzle (SEN). The speed of the molten steel near the SEN decreased with the casting speed increasing and increased with the argon flow rate increasing. Most of argon bubbles are larger than 4.5 mm inside the mold at the casting speed of 0.6 m min−1 and the argon flow rate of 18 NL min−1. The breakup rate of bubbles inside the mold increased with the increasing of the casting speed and the coalescence rate increased with the increasing of the argon flow rate. The coalescence and breakage of argon bubbles inside the mold mainly occurred during the rising of bubbles to the top surface and the moving of bubbles with the steel jet to the narrow face. The average diameter of bubbles decreased when the casting speed increased and the diameter increased when the argon flow rate increased.
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argon bubbles,multiple-size-group model,nail board measurement,water modeling
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要点】:本研究通过数值模拟探讨了不同铸造速度和氩气流量下,氩气泡在钢坯连续铸造中的空间分布,发现铸造速度和氩气流量对氩气泡的大小和分布有显著影响。

方法】:采用欧拉-欧拉多尺寸组方法进行数值模拟,并通过水模型实验和工业试验的钉板测量验证计算的流体流动。

实验】:在潜水入口喷嘴(SEN)处注入直径为2mm的氩气泡。结果显示,在铸造速度为0.6 m/min和氩气流量为18 NL/min时,模具内部大部分氩气泡大于4.5mm。随着铸造速度的增加,靠近SEN的熔融钢速度降低;随着氩气流量的增加,氩气泡的破碎率增加,而合并率也随之增加。在模具内部,氩气泡的合并和破裂主要发生在气泡上升到顶部表面和随钢流移动到窄面时。随着铸造速度的增加,气泡平均直径降低;而随着氩气流量的增加,气泡直径升高。