摘要
连退板带生产需经过炼钢、热轧、冷轧、连退多个工序,其表面划伤缺陷形貌多样,需要及时确定划伤缺陷产生的工序才能更有针对性地采用相对应的控制措施。针对连退板带划伤缺陷的形貌特征,可将划伤缺陷划分为4类,并确定了4类划伤的产生工序,即I类划伤缺陷产生于炼钢连铸工序,Ⅱ类划伤缺陷产生于热轧工序,III类划伤缺陷产生于冷轧工序,Ⅳ类划伤缺陷产生于连退工序。为此,在各工序采取了有针对性的控制措施,如加强辊系的检查、清理和维护,保证过渡导台、横梁高度合理,定期辊道、辊系点检检查和电机、润滑油的维护保养,合理设定热轧侧导板的清理和夹持力,保证冷轧乳化液浓度、轧辊粗糙度,合理设定连退炉子段、活套和圆盘剪张力等,划伤缺陷率降低30%以上,大大提高了连退产品的质量。
The production of continuous annealing strip requires multiple processes including steelmaking,hot rolling,cold rolling,and continuous annealing.The surface scratch defect morphology is diverse,and it is necessary to promptly determine the process where the scratch defect occurs in order to adopt more targeted control measures.Based on the morphological characteristics of the scratch defects of the continuous annealing strip,the scratch defects can be divided into four types and the production processes of the four types of scratches have been determined.The typeⅠscratch defect is generated in the continuous casting process of steelmaking,the typeⅡscratch defect is generated in the hot rolling process,the typeⅢscratch defect is generated in the cold rolling process,and the typeⅣscratch defect is generated in the continuous annealing process.To this end,targeted control measures have been taken in each process,such as strengthening the inspection,cleaning,and maintenance of the roller system,ensuring the reasonable height of the transition guide and crossbeam,regular inspection of the roller track and roller system,and maintenance of the motor and lubricating oil,reasonable setting of the cleaning and clamping force of the hot rolling side guide plate,ensuring the concentration of cold rolling emulsion and the roughness of the rolls,and reasonable setting of the tension of the continuous annealing furnace section,loop,and disc shear,etc.The scratch defect rate of sheet and strip has been reduced by more than 30%,greatly improving the quality of continuous annealing products.
作者
马冬凯
陈志桐
MA Dongkai;CHEN Zhitong(Hansteel Co.,Ltd.,HBIS Group,Handan 056003,China)
出处
《轧钢》
2023年第5期124-128,共5页
Steel Rolling
关键词
连退板
划伤缺陷
缺陷形貌
原因分类
控制措施
continuous annealing sheet
scratch defect
defect morphology
cause classification
control measures
