Role of Solidification in Submerged Entry Nozzle Clogging During Continuous Casting of Steel,Steel Research International

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Role of Solidification in Submerged Entry Nozzle Clogging During Continuous Casting of Steel
Steel Research International ( IF 1.9 ) Pub Date : 2020-07-16 , DOI: 10.1002/srin.202000230
Hadi Barati _{1,

2} , Menghuai Wu ₂ , Abdellah Kharicha ₂ , Andreas Ludwig ₂

Affiliation

Metallurgists are embroiled in a debate on the role of solidification in submerged entry nozzle (SEN) clogging during continuous casting of steel: does clogging originate from solidification, or does clogging cause the solidification? This study tries to clarify this debate. An enthalpy‐based mixture continuum model is used to simulate solidification in a clog structure. The 3D structure of the clog is reconstructed using X‐ray tomography images of an as‐clogged piece in an SEN, and is directly used in the numerical model. The flow and solidification in the open pores/channels of the clog structure are then calculated. The modeling results demonstrate that although solidification does occur deep in the clog structure as the melt flow is stopped, a gap remains between the solidification and clog fronts. This gap signifies an open‐channel clog region, and the clog structure in this region needs to be mechanically strong to withstand the impact of the melt flow; otherwise, fragmentation occurs. The study verifies that the solidification cannot occur before clogging if the molten steel has sufficient superheat and the SEN is properly preheated. A SEN made of an isolating refractory material can postpone the clogging, thereby extending its service life.

中文翻译：

钢水连铸过程中凝固在浸入式水口堵塞中的作用

冶金学家卷入了一场辩论，讨论了凝固在连续浇铸钢时浸入式水口（SEN）堵塞中的作用：堵塞是由凝固引起的还是由凝固引起的？这项研究试图澄清这一辩论。基于焓的混合物连续体模型用于模拟木log结构中的凝固。堵塞的3D结构是使用SEN中被堵塞的零件的X射线断层扫描图像重建的，并直接用于数值模型中。然后计算堵塞结构的开放孔/通道中的流动和凝固。建模结果表明，尽管随着熔体流动的停止，凝固确实发生在堵塞结构的深处，但在凝固和堵塞前沿之间仍然存在间隙。该间隙表示明渠堵塞区域，该区域的堵塞结构必须在机械上坚固，以承受熔体流动的影响。否则会产生碎片。研究证明，如果钢水具有足够的过热度并且对SEN进行了适当的预热，则凝固不会在堵塞之前发生。由绝缘耐火材料制成的SEN可以推迟堵塞，从而延长其使用寿命。

更新日期：2020-07-16

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