105中间包控流装置对铸坯洁净度的影响.docVIP

中间包控流装置对铸坯洁净度的影响 唐海燕1, 李京社1, 高锦国1, 宁建成2, 左著2, 田汉蒲2 (1.北京科技大学冶金与生态工程学院，北京 100083；2.华菱集团湖南衡阳钢管有限公司, 湖南 衡阳 421002) 摘要：通过中间包水模型实验对4流圆坯中间包两种挡墙形式下包内流场进行了模拟研究，通过工业试验研究了原挡墙中间包和改进型挡墙中间包对铸坯洁净度的影响。结果表明：改进型挡墙中间包能增加钢液在中间包内的停留时间，减小中间包的死区比例，提高夹杂物的去除率。与原型挡墙中间包相比，从中间包到铸坯过程钢中总氧去除率显著提高，铸坯中大型夹杂物含量降低51.9%，10.81%；同时改进型挡墙中间包内各流总氧和夹杂物分布更加均匀。 关键词：中间包，洁净度，夹杂物，控流装置 The Effect of Flow Control Devices of Tundish on Cleanliness of Billets TANG Hai-yan1, LI Jing-she1, GAO Jin-guo1, NING Jian-cheng2, ZUO Zhu2, TIAN Han-pu2 (1.School of metallurgical and ecological engineering, Univercity of Science and Technology Beijing,,Beijing 100083,China；2.Hunan Hengyang Steeltube Corp., HuaLing Group, Hengyang 421002, Hunan, China) Abstract: The fluid flow of four-strand tundish of round billet under two different weirs has been studied by water model experiments.The effect of tundishes controlled by original and improved weirs on cleanliness of billet has been studied by industrial trial. The results show that the improved weir can increase residence time of molten steel in tundish and removal rate of inclusion and decrease dead volume fractions of tundish.Compared with the original weir, the removal percent of the total oxygen from tundish to billet is obviously increased, and the macroinclusion content and the microinclusion number in billet are decreased by 51.9% and 10.81%, respectively. Also,the total oxygen and inclusion distribution at different strands of improved tundish are more homogeneous. Key words: tundish, cleanliness, inclusion, flow control device 1引言 随着中间包冶金技术的发展与完善，中间包不仅是把钢水均匀分配给各个结晶器和实现多炉连浇的中间容器，而且承担着去除夹杂物、合金微调、控制过热等冶金功能 [1~3]。中间包内合理控流元件的设置以及合理的钢水流动状态对延长钢水在中间包内的停留时间、均匀钢水温度和成分、减少卷渣和促进夹杂物上浮有重要作用。不合理的中间包控流装置会导致夹杂物上浮不充分或局部聚集，从而影响钢的质量和性能。国内某钢厂生产的大断面连铸坯全部用来轧制石油套管、高压气瓶管、管线管等无缝钢管，这些产品使用的特殊性决定了其不仅要有高强度、低脆性、良好的韧塑性和焊接性，还要有高的耐压、耐应力腐蚀和抗氢脆等特性。尽管该公司生产的产品受到国内外用户的好评，但由于钢管质量问题引起的经济损失仍不小。影响钢管质量的因素是多方面的，但检测表明钢中非金属夹杂物是影响其性能的重要因素之一。Ginzburg和Ballas论述了连铸板坯和热轧产品的缺陷，其中很多都与夹杂物有关。钢的机械性能很大程度上