方坯单辊重压下技术实践及工艺控制探讨  

Practice and process control of single roll heavy reduction technology for billets

作　　者：钱亮 黄雁 高文星 左小坦 李泽林 谢长川 韩占光 QIAN Liang;HUANG Yan;GAO Wenxing;ZUO Xiaotan;LI Zelin;XIE Changchuan;HAN Zhanguang(CCTEC Engineering Co.,Ltd.,Wuhan 430076,Hubei,China;Wuhu Xinxing Ductile Iron Pipes Co.,Ltd.,Wuhu 241000,Anhui,China;Center for Advanced Solidification Technology,Shanghai University,Shanghai 200044,China;General Steelmaking Plant,Ansteel Co.,Ltd.,Anshan 114021,Liaoning,China)

机构地区：[1]中冶南方连铸技术工程有限责任公司,湖北武汉430076 [2]芜湖新兴铸管有限责任公司,安徽芜湖241000 [3]上海大学先进凝固技术中心,上海200044 [4]鞍山股份有限公司炼钢总厂,辽宁鞍山114021

出　　处：《中国冶金》2025年第1期77-86,共10页China Metallurgy

摘　　要：单辊重压下作为重压下技术的实施方式之一,不是仅将重压下技术作为轻压下技术的补充或优化,而是作为区别于轻压下的独立压下技术来应用,很有必要对其工艺有效性进行验证,以及基于实践对其进行系统阐述。基于180 mm×180 mm方坯82B钢种单辊重压下的实践结果,在可靠的中心缩孔和中心偏析评价方法基础上,通过对不同压下位置进行单辊重压下改善效果分析,验证单辊重压下工艺独立改善铸坯质量的有效性,并结合实践给出单辊重压下工艺控制的机理方法及指导原则,最后说明单辊重压下工艺带来压下设备方案简化的优势。单辊重压下的实践及研究分析结果表明,连铸重压下改善中心缩孔最优的压下位置为补缩通道未关闭、缩孔未形成之前,而非在缩孔形成之后再进行焊合;重压下改善中心偏析最优位置也为补缩通道未关闭、缩孔未形成之前;中心疏松、缩孔和中心偏析的形成在机理上相互关联,通过在补缩通道未关闭、缩孔未形成的合适区域进行单辊重压下,可以同时改善中心缩孔和中心偏析,达到全面改善铸坯质量的效果;随着单辊压下量的增大,疏松、缩孔缺陷有向中心聚集的趋势,而伴随的中心偏析未见有明显增大趋势;82B钢种补缩通道结束的临界位置在中心固相率0.73左右。单辊重压下工艺会带来方坯压下设备的简化,大大降低方坯投用压下的成本。As one of the implementation methods of heavy reduction technology,single roll heavy reduction is different from only using heavy reduction technology as a supplement or optimization of soft reduction technology.Instead,it is applied as an independent reduction technology different from soft reduction.It is necessary to verify the effectiveness of its process,and even systematically explain it based on practice.Based on the practical results of single roll heavy reduction of 82B steel grade with 180 mm×180 mm billets,and on the basis of reliable evaluation of center shrinkage and center segregation methods,the improvement effect of center shrinkage and center segregation after single roll heavy reduction at different pressing positions is analyzed to verify the effectiveness of single roll heavy reduction technology in independently improving the quality of casting billets.Combined with practice,the mechanism,method,and guiding principles of single roll heavy reduction process control are proposed.Finally,the advantages of single roll heavy reduction technology in simplifying equipment schemes are presented.The results of practice and research analysis under single roll heavy reduction show that the optimal reduction position for improving center shrinkage under continuous casting heavy reduction is before the filling and shrinking channels are closed and the shrinkage holes are formed,rather than welding after the shrinkage holes are formed.The optimal location for improving center segregation under heavy reduction is also before the filling and shrinking channels are closed and shrinkage holes are formed.The formation of center porosity,shrinkage,and center segregation are interrelated in mechanism.By applying single roll heavy reduction in suitable areas where the filling and shrinking channels are not closed and shrinkage holes are not formed,both center shrinkage and center segregation can be effectively controlled simultaneously,achieving the effect of improving the quality of the casting billet.As the amo

关 键 词：连铸 方坯 单辊重压下 缩孔 偏析 轻压下 铸坯 疏松 

分 类 号：TF777[冶金工程—钢铁冶金]