工程科学学报，第37卷，第12期：1630-1636,2015年12月 Chinese Journal of Engineering,Vol.37,No.12:1630-1636,December 2015 D0l:10.13374/j.issn2095-9389.2015.12.015;http://journals..ustb.edu.cn 中厚板边部折叠模拟实验及机理研究 马忠伟12四，张慧》，胡鹏2，赵沛》，宋波” 1)北京科技大学治金与生态工程学院，北京1000832)钢铁研究总院连铸技术国家工程研究中心，北京100081 ☒通信作者，E-mail:shiliushuma@126.com 摘要通过对中厚板边部折叠试样的检测分析，对其产生机理和影响因素进行研究.结果显示，中厚板边部折叠现象是板 材横轧宽展过程中侧面材料在轧制中受轧辊作用而翻转到板材表面的结果.折叠缺陷处所观察到的微观组织结构，是轧制 前板材表面在高温下形成的氧化铁及脱碳层形成的.建立了轧制有限元数值模型，证实折叠缺陷是在轧制过程中由侧面的 折叠翻转所造成的.通过实验室实验，得到铸坯边部质量、轧制制度、宽展道次及轧制压下量对中厚板折叠缺陷的影响.实验 结果表明横轧宽展导致折叠缺陷的出现，铸坯边部质量对其没有影响，轧制过程中铸坯侧边的折叠经翻平形成表面折叠缺 陷，随着横轧展宽的道次及压下量增加，折叠缺陷距边部距离变大. 关键词板材：轧制：边部折叠：形成机理：模拟实验 分类号TG335.5 Simulation experiments and mechanism of medium plate edge folding MA Zhong-ce,ZHANG Hui,HU Peng,ZHAO Pei,SONG Bo 1)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)National Engineering Research Center of Continuous Casting Technology,Central Iron and Steel Research Institute,Beijing 100081,China Corresponding author,E-mail:shiliushuma@126.com ABSTRACT The formation mechanism and influencing factors of fold defects at the medium plate edge were studied by detecting and analyzing edge folding samples.It is found that the plate edge folding phenomenon results from the transformation of slab lateral side to plate surface during the broadside rolling process.The microstructure observed at the fold defects is composed of iron oxide and a de- carburization layer formed at high temperature in the plate surface before rolling.Finite element numerical simulation of the rolling process confirms that the folding defects are mainly caused by the transformation of lateral side.The influences of slab defects,rolling procedures,broadening passes and reduction on the plate fold defects were obtained by rolling experiments.Experimental results show that rolling spread leads to the fold edge defects,which do not depend on the quality of the slab.In the process of rolling,the folding of lateral side transfers to the plate surface and changes to be edge seam defects.The distance of folding to the edge increases with the increment of broadside rolling passes and reduction. KEY WORDS steel plates:rolling;edge folding;formation mechanisms:simulation experiments 中厚板因其广泛应用于众多领域，如建筑结构、工 陷可，严重影响后续加工使用，因此实际生产中对中厚 程机械、海洋平台和石油化工，而成为整个钢铁生 板边部折叠缺陷的处理主要通过大切边和表面修磨完 产水平的重要标志.然而，中厚板生产过程中经常会 成.这种缺陷使得中厚板产品质量下降，生产效率降 出现边部折叠缺陷，即从加热炉出来的铸坯进行热轧 低，成本效益受损日.因此，研究中厚板折叠缺陷对指 后，会在钢板表面靠近边部处形成一条或多条直线状 导实际生产具有重要意义. 缺陷，成为热轧微合金化钢板中常见的表面质量缺 对于热轧中厚板边部折叠的形成机理较多，如非 收稿日期：201508-13工程科学学报，第 37 卷，第 12 期: 1630--1636，2015 年 12 月 Chinese Journal of Engineering，Vol． 37，No． 12: 1630--1636，December 2015 DOI: 10． 13374 /j． issn2095--9389． 2015． 12． 015; http: / /journals． ustb． edu． cn 中厚板边部折叠模拟实验及机理研究 马忠伟1，2) ，张 慧2) ，胡 鹏2) ，赵 沛2) ，宋 波1) 1) 北京科技大学冶金与生态工程学院，北京 100083 2) 钢铁研究总院连铸技术国家工程研究中心，北京 100081  通信作者，E-mail: shiliushuma@ 126． com 摘 要 通过对中厚板边部折叠试样的检测分析，对其产生机理和影响因素进行研究． 结果显示，中厚板边部折叠现象是板 材横轧宽展过程中侧面材料在轧制中受轧辊作用而翻转到板材表面的结果． 折叠缺陷处所观察到的微观组织结构，是轧制 前板材表面在高温下形成的氧化铁及脱碳层形成的． 建立了轧制有限元数值模型，证实折叠缺陷是在轧制过程中由侧面的 折叠翻转所造成的． 通过实验室实验，得到铸坯边部质量、轧制制度、宽展道次及轧制压下量对中厚板折叠缺陷的影响． 实验 结果表明横轧宽展导致折叠缺陷的出现，铸坯边部质量对其没有影响，轧制过程中铸坯侧边的折叠经翻平形成表面折叠缺 陷，随着横轧展宽的道次及压下量增加，折叠缺陷距边部距离变大． 关键词 板材; 轧制; 边部折叠; 形成机理; 模拟实验 分类号 TG335. 5 Simulation experiments and mechanism of medium plate edge folding MA Zhong-wei1，2)  ，ZHANG Hui2) ，HU Peng2) ，ZHAO Pei2) ，SONG Bo1) 1) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) National Engineering Ｒesearch Center of Continuous Casting Technology，Central Iron and Steel Ｒesearch Institute，Beijing 100081，China  Corresponding author，E-mail: shiliushuma@ 126． com ABSTＲACT The formation mechanism and influencing factors of fold defects at the medium plate edge were studied by detecting and analyzing edge folding samples． It is found that the plate edge folding phenomenon results from the transformation of slab lateral side to plate surface during the broadside rolling process． The microstructure observed at the fold defects is composed of iron oxide and a de￾carburization layer formed at high temperature in the plate surface before rolling． Finite element numerical simulation of the rolling process confirms that the folding defects are mainly caused by the transformation of lateral side． The influences of slab defects，rolling procedures，broadening passes and reduction on the plate fold defects were obtained by rolling experiments． Experimental results show that rolling spread leads to the fold edge defects，which do not depend on the quality of the slab． In the process of rolling，the folding of lateral side transfers to the plate surface and changes to be edge seam defects． The distance of folding to the edge increases with the increment of broadside rolling passes and reduction． KEY WOＲDS steel plates; rolling; edge folding; formation mechanisms; simulation experiments 收稿日期: 2015--08--13 中厚板因其广泛应用于众多领域，如建筑结构、工 程机械、海洋平台和石油化工［1--2］，而成为整个钢铁生 产水平的重要标志． 然而，中厚板生产过程中经常会 出现边部折叠缺陷，即从加热炉出来的铸坯进行热轧 后，会在钢板表面靠近边部处形成一条或多条直线状 缺陷，成为热轧微合金化钢板中常见的表面质量缺 陷［3］，严重影响后续加工使用，因此实际生产中对中厚 板边部折叠缺陷的处理主要通过大切边和表面修磨完 成． 这种缺陷使得中厚板产品质量下降，生产效率降 低，成本效益受损［4］． 因此，研究中厚板折叠缺陷对指 导实际生产具有重要意义． 对于热轧中厚板边部折叠的形成机理较多，如非