热轧低碳DC04钢表面色差产生机理及控制  

Formation Mechanics and Control Strategy of Surface Color Difference for Hot-rolled Low Carbon DC04 Steel

作　　者：曹光明[1] 汤军舰 林飞 李志峰[1] 徐蓉[1] 刘振宇[1] CAO Guangming;TANG Junjian;LIN Fei;LI Zhifeng;XU Rong;LIU Zhenyu(The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《湖南大学学报（自然科学版）》2018年第12期59-65,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51204047;U1660117)~~

摘　　要：针对钢铁企业生产中热轧低碳DC04钢出现的色差问题,通过对现场取样分析,明确了造成热轧带钢表面色差缺陷的主要原因是中部和边部的氧化铁皮的厚度和结构存在差异.为解决这一问题,利用高温差热分析仪(TGA)和场发射电子探针(EPMA),模拟研究了在连续冷却过程中氧化铁皮微观结构的转变规律.结果表明,先共析Fe3O4优先在原始的Fe3O4层处形核生长,随着温度的降低,开始生成片层状的共析组织Fe3O4+α-Fe,但当冷却速率达到25℃/min时,共析反应被阻止.依据实验结果在生产现场进行工业试制,通过合理的设定卷取温度和冷却速率有效地控制氧化铁皮微观组织结构和厚度,基本消除了表面色差缺陷.On-site samples about color difference defect on the surface of hot-rolled low carbon DC04from steel enterprises were analyzed,and it was determined that the difference of the thickness and the structure of oxide scale between the surfaces in the middle and in the edge was the main reason for the color difference on the surface of hot-rolled strip.The transformation law of microstructure of oxide scale in continuous cooling was simulated and investigated by means of thermogravimetric analysis(TGA)and electron probe microanalysis(EPMA)in order to solve this problem.The results showed that pro-eutectoid Fe3O4was prior to nucleate at the original Fe3O4layer.The lamellar eutectoid structure was obtained as the cooling temperature decreased.However,when the cooling rate reached25℃/min,the eutectoid reaction was suppressed in the oxide scale.Industrial trial production was implemented based on the results of laboratory research,the microstructure and thickness of oxide scale were effectively controlled by adjustment of coiling temperature and cooling rate,and the cooling temperature was reduced to the temperature range of eutectoid transformation,and then the color difference defect was basically eliminated.

关 键 词：热轧带钢 色差缺陷 氧化铁皮 厚度控制 结构转变 

分 类 号：TG335.1[金属学及工艺—金属压力加工]