Q345qD连铸板坯中心偏析的影响因素及改进措施  

Influencing factors and improvement measures of Q345qD continuous casting slab center segregation

作　　者：张菊根 郭文波 张海波 万勇 冯孔孔 ZHANG Jugen;GUO Wenbo;ZHANG Haibo;WAN Yong;FENG Kongkong(Heavy Plate Special Steel Division,Xinyu Iron and Steel Co.,Ltd.,Xinyu 338001,China;Zhongda National Engineering and Research Center of Continuous Casting Technology Co.,Ltd.,Beijing 100081,China;School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,China)

机构地区：[1]新余钢铁股份有限公司厚板特钢事业部,新余338001 [2]中达连铸技术国家工程研究中心有限责任公司,北京100081 [3]安徽工业大学冶金工程学院,马鞍山243002

出　　处：《江西冶金》2024年第6期436-442,共7页Jiangxi Metallurgy

摘　　要：轻压下技术可有效改善铸坯中心偏析、疏松、缩孔等缺陷。为了改善Q345qD钢2270mm×250 mm断面的连铸板坯在生产过程中出现的中心偏析等问题,本研究通过建立凝固传热模型,研究拉速、过热度、比水量对Q345qD铸坯凝固过程的影响,并通过射钉试验验证此模型的准确性。在原有工艺的基础上,采用动态轻压下技术改变铸坯凝固过程。结果表明,采用动态轻压下技术后,铸坯内部质量显著提高,铸坯低于1.0级偏析比例由51.21%提高至62.11%。The soft reduction technique can effectively improve the defects such as center segregation,loosening,and shrinkage of cast slabs.In order to improve the problems such as center segregation in the production process of continuous casting slabs of Q345qD steel with 2270 mm×250 mm section,this study establishes a solidification heat transfer model,investigates the influence laws of casting speed,superheat,and specific water volume on the solidification process of Q345qD cast billets,and verifies the accuracy of the model through shot peg tests.dynamic soft reduction technology is used to improve the internal quality of cast billet.The results show that the proportion of cast billets with less than 1.0 grade segregation is increased from 51.21%to 62.11%after adopting the dynamic soft reduction technology.

关 键 词：动态轻压下 三维温度场 拉速 过热度 比水量 

分 类 号：TF777.1[冶金工程—钢铁冶金]