喷嘴布置方式对中厚板坯连铸二次冷却效果的影响

Influence of nozzle layouts on the secondary cooling effect of medium thickness slabs in continuous casting

摘要: 研究了铸机矫直区现行喷嘴布置对板坯冷却效果的影响,并在喷嘴自动化测试平台上进行一系列喷嘴的组合实验,从喷嘴流量、喷射高度和水压三个方面探讨了相邻喷嘴喷淋水重叠度与水量在板坯宽度方向分布均匀性的关系.在此基础上,对现行的二次冷却系统提出了优化方案.实验结果表明,优化后,铸坯角部横裂基本消除,铸坯中心偏析从B类1.0减轻至C类1.5,其等轴晶比例提高了4.1%,明显地改善了铸坯的内部质量.

Abstract: This research focused on the influence of existing nozzles arrangement at the straightening zones of a caster on the cooling effect of slabs. Through a series of tests for combined nozzles on the nozzle automatic testing platform, the relationship between the spray overlap degree of adjacent nozzles and the uniformity of water distribution in the slab width direction was analyzed from three aspects including nozzle flowrate, injection height and hydraulic pressure. Based on the above research results, an optimization scheme was put forward for the secondary cooling system. Experiment results show that the internal quality of slabs improves significantly after optimization. Transverse corner cracks in slabs are almost eliminated, the center segregation level reduces from B 1.0 to C 1.5, and the ratio of equiaxed grains increases by 4.1%.