摘要
为了研究热镀铝锌带钢表面锌渣与锌灰缺陷的形成机理,进一步通过工艺优化提高带钢表面质量。在初步确定热镀铝锌机组热镀工艺段带钢规格与工艺参数波动对锌锅锌渣与炉鼻子锌灰产生的影响的基础上,结合热镀铝锌机组的热镀机理、设备结构特点与生产工艺参数,分析了锌渣与锌灰对热镀工艺段沉没辊系运行状态的影响,以及在热镀段不同工艺位置带钢表面形成的转印锌渣、锌渣划伤、点状锌渣与锌灰漏镀类型。同时,通过对带钢表面质量缺陷处采用扫描电子显微镜与能谱仪进行了形貌与缺陷成分分析,确定了锌渣与锌灰缺陷的主要成分为氧化锌、铁铝与铁锌化合物。在此基础上,结合热镀工艺与设备对锌渣与锌灰的形成机理展开分析,发现带钢出炉温度与入锌锅温度波动是导致锌渣与锌灰缺陷加速形成的主要因素,并利用热镀铝锌机组验证了带钢出炉温度与入锌锅温度波动是锌渣与锌灰形成原因的正确性。此外,根据锌锅沉没辊系结构参数,充分考虑沉没辊系、带钢规格、热镀工艺参数及温度影响因素建立了锌鼻子与锌锅温度场模型。在表面缺陷现场验证与温度模型建立的基础上,结合连退冷却炉能力对带钢出炉温度进行优化,有效降低了带钢表面锌渣与锌灰缺陷的改判量。为从工艺角度进一步治理锌渣与锌灰缺陷奠定研究基础,同时为热镀工艺段锌锅与锌鼻子设备升级提供了温度控制模型。
In order to research the formation mechanism of zinc slag and zinc ash defects on the surface of hot-dip aluminized zinc strip steel,as well as,improve the surface quality of strip steel through process optimization,the fluctuation of strip steel specifications and process parameters was initially determined in the hot-dip galvanizing process.Which was the main factor for the generation of zinc slag in the zinc pot and zinc ash in the furnace nose.The hot-dipping mechanism,equipment parameters and production process were combined,in the further,analyzed the effect of both defects on the running state of the submerged roll system.and the surface's type of strip steel on the different positions in the hot-dip process section.Such as transfer slag,slag scratches,spot slag and zinc ash leakage plating.At the same time,the SEM(Scanning Electron Microscope)and EDS(Energy Dispersive Spectrometer)experimental methods were used to observation of defect morphology and ensure the composition about zinc dross and zinc ash defects,which probably was zinc-oxide,iron-aluminum and iron-zinc compounds.Besides,the formation mechanism of zinc dross and zinc ash was analyzed at the help of combining with hot dip technology and equipment.The results showed that temperature fluctuation was the main factor of zinc dross and zinc ash defects.It was verified that the fluctuation of the strip temperature at the out of cooling furnace and entering zinc pot as the mechanism of the defects was correctness in the hot-dip galvanizing unit.Meanwhile,the submerged roll system,strip steel specifications,thermal process parameters and temperature influencing factors were considered when the temperature field models of zinc nose and zinc pot were established.Based on theoretical research and practice,combined with the capacity of the continuous cooling furnace,the strip temperature was optimized which effectively reduces the amount of zinc slag and zinc ash defects on the strip surface.The results laid the foundation for further treatment of zinc slag and zinc ash defects from the view of production process.It also provided a temperature control model for the upgrading of zinc pot and zinc nose equipment in the hot-dip galvanizing unit.
作者
张文军
刘格非
王孝建
钱胜
张冀
白振华
ZHANG Wen-jun;LIU Ge-fei;WANG Xiao-jian;QIAN Sheng;ZHANG Ji;BAI Zhen-hua(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China;Meigang Technology Center,Center Research Institute,Baosteel Co.,Ltd.,Nanjing 210008,Jiangsu,China;College of Mechanical and Electrical Engineering,Huangshan University,Huangshan 245011,Anhui,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2023年第4期87-95,共9页
Iron and Steel
基金
河北省重大科技成果转化专项资助项目(22281001Z)。
关键词
热镀铝锌
表面质量
锌灰
锌渣
温度
hot dip galvanized
surface quality
zinc ash
zinc dross
temperature
