结晶器圆角对160 mm×160 mm连铸坯轧制质量的影响  

Influence of crystallizer fillet on rolling quality of 160 mm×160 mm continuous casting billets

作　　者：林鹏 李立刚 张龙 郑亚旭 万敏 Lin Peng;Li Ligang;Zhang Long;Zheng Yaxu;Wan Min(Department of Materials and Building Engineering,Hebei Institue of Mechanical and Electrical Technology,Xingtai 054000,China;Xingtai Technology Innovation Center for Mold Material,Xingtai 054000,China;Steelmaking Plant,Xingtai Iron and Steel Co.,Ltd.,Xingtai 054027,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050091,China;Yancheng Lianxin Stel Co.,Ltd.,Yancheng 224100,China)

机构地区：[1]河北机电职业技术学院材料与建筑工程系,河北邢台054000 [2]邢台市模具材料技术创新中心,河北邢台054000 [3]邢台钢铁有限责任公司炼钢厂,河北邢台054027 [4]河北科技大学材料科学与工程学院,河北石家庄050091 [5]盐城市联鑫钢铁有限公司,江苏盐城224100

出　　处：《锻压技术》2024年第9期99-107,共9页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52204341);中国博士后科学基金资助项目(2023M740415);河北省高等学校科学技术研究项目(ZC2024141)。

摘　　要：以160 mm×160 mm连铸坯为研究对象,利用数值仿真模拟分析粗轧过程中不同圆角连铸坯角部区域的应力、应变分布规律,通过工艺试验研究不同圆角连铸坯的内部和表面质量以及轧制线材裂纹比例。结果表明,连铸坯圆角半径增大,角部区域的等效应变和应力减小。工艺试验中,圆角半径为8 mm时连铸坯的表面振痕深,显微组织存在多条细条状先共析铁素体,轧制大规格线材裂纹比例高;圆角半径为15和20 mm时连铸坯的表面振痕深度降低,显微组织由块状铁素体和少量珠光体组成,轧制大规格线材裂纹比例低;圆角半径为20 mm的结晶器与连铸坯角部摩擦力增加,易导致漏钢、拉断等生产事故。160 mm×160 mm连铸坯结晶器的圆角半径以15 mm为宜。Taking the 160 mm × 160 mm continuous casting billet as the research object,the numerical simulation was used to analyze the stress-strain distribution in the corner area of continuous casting billets with different fillets during rough rolling process.The internal and surface quality of different rounded continuous casting billets and the proportion of rolling wire cracks were studied through process experiments.The results indicate that as the fillet radius of cast billet increases,the equivalent strain and stress in the corner area decrease.In the process experiment,the surface vibration marks of continuous cast billet with the fillet radius of 8 mm were deep,and there were multiple fine strip-shaped pro-eutectoid ferrite in the microstructure.The proportion of cracks in the rolled large-sized wire rod was high.The depth of surface vibration marks of continuous casting billet with fillet radius of 15 and 20 mm is reduced,and the microstructure is composed of blocky ferrite and a small amount of pearlite.The proportion of cracks in rolled large-sized wire rods is low.The friction force between crystallizer with the fillet radius of 20 mm and the corner of continuous casting billet increases,which can easily lead to production accidents such as steel leakage and breakage.The fillet radius of the 160 mm × 160 mm continuous casting billet crystallizer should be 15 mm.

关 键 词：连铸坯 结晶器 圆角半径 轧制质量 裂纹比例 

分 类 号：TG335.15[金属学及工艺—金属压力加工]