直通型水口浸入深度对220mm×260mm方坯结晶器流场影响

Influence of insertion depth of straight nozzleon flow field for 220mm×260mm billet continuous casting mold

结晶器内钢液流动状态会直接影响铸坯的质量,不合理的流场会导致液面流速过大,弯月面波动过大,造成卷渣。采用几何相似1:1水模型和Fluent流体力学软件研究了220 mm×260 mm方坯结晶器直通型水口浇注下,不同浸入深度对结晶器液面波动、表面流速、流场分布、冲击深度、保护渣覆盖的影响。结果表明:直通型水口流股集中,冲击深度较大,液面波动均匀,波动受浸入深度和拉速的影响较小。保护渣渣层覆盖良好,渣层均匀,出现卷渣的可能性较小。综合考虑冲击深度,保护渣活跃程度,结晶器电磁搅拌的影响,现场合适的浸入深度为80~100 mm。

The flow state of the molten steel will directly affect the quality of the final casting. The unreasonable flow field can lead to relatively largesurface flow velocity and comparatively large fluctuation of the meniscus, which will cause the slag entrapment.The effects of different insertion depthsonsurface fluctuation, surfaceflow velocity, flow field distribution, impact depth, and surface mold powder covering of 220 mm × 260 mm billet mold were studied by the geometric similarity 1 ： 1 water model and Fluent fluid mechanics software. The results show that the flow of the straight nozzle is concentrated; the impact depth is comparatively large; the fluctuation of the liquid surface is uniform; the fluctuation is less affected by the immersion depth and the casting speed. The slag layer is well covered and the slag layer is uniform and the possibility of slag entrapment is comparatively small. Comprehensively considering the influence of the impact depth, the active degree of mold powderand mold electromagnetic stirring, the appropriate nozzle insertion depthis 80 to 100 mm.