
总第257期 2017年第5期
河北冶金 HEBEIMETALLURGY
冷轧板表面黄斑缺陷原因分析及预防
石建强,杨西鹏,陈文超,蒋建朋,李震(河钢集团邯钢公司技术中心,河北邯郸056015)
Total No. 257 2017,Number5
摘要:通过扫描电镜及能谱分析、工艺调查等手段,分析了冷轧板黄斑缺陷形成的原因。认为酸轧冷硬卷表面乳化液残留较多,在清洗不彻底情况下,残存乳化液在高温还原性气体作用下在炉内裂解,形成碳元素富集;同时酸洗后残留在带钢表面的C1',在连退炉水槽与水发生一系列化学反应形成了铁的化合物,导致黄斑缺陷的产生。通过降低酸轧乳化液浓度,提高冷硬卷反射率和清洗效果,控制水淬槽
水温等一系列措施,根除了冷轧板表面的黄斑缺陷关键词:冷轧板;黄斑;原因;预防
中图分类号:TG142.1
文献标识码:A
doi:10. 13630/j. cnki. 13 1172.2017.0507
文章编号:10065008(2017)05002904
CAUSEANALYSISANDPREVENTIVEMEASURESOF MACULARDEFECTONCOLDROLLEDPLATESURFACE
Shi Jianqiang,Yang Xipeng,Chen Wenchao,Jiang Jianpeng,Li Zhen
(Technology Center, HBIS Group Hansteel,Handan,Hebei, 056015)
Abstract: The causes of macular defect on cold rolled sheet are analyzed by scanning and process investigation. It is believed that there is much residual emulsion on the surface of acid chilled rolls; in the case of incomplete cleaning, residual emulsion is cracked in the fumace under the action of high temperature reducing gas, which forms carbon enrichment. At the same time, iron compounds are formed by a series of chemical reactions occured between the residual Cl- on the surface of strip after pickling and water in water quenching tank of continuous annealing fumace, which leads to macular.The macular defect on cold rolled plate surface are eliminated through a series of measures such as reducing acid emulsion concentration, impraving the reflectivity and cleaning effect of chill rolls and controlling water quenching tank temperature Key Words : cold rolled plate; macular; cause; prevention
0
引言
邯钢汽车板冷轧板产品某终端用户反馈其表面存在黄斑缺陷,缺陷为淡黄色,呈云片状分布,通板上下表面均存在,有光感无手感,并在磷化工序后,黄斑缺陷处会出现表面光感不均勾的问题。
本文利用扫描电镜对黄斑样品进行表面形貌检测,同时结合现场实际工艺参数,分析确认了黄斑产生的原因。同时有针对性地采取了措施,彻底解决
收稿日期;2017-02-23
作者简介:石建强(1982-),男,工程师,2006年毕业于河北理工大学轧钢专业,现在河钢集团邯郸公司技术中心从事汽车用钢研究, Email:sjq327@163.com
万方数据
了黄斑缺陷问题。
缺陷样品检测
1
用户反映的呈淡黄色,云片状分布,通板上下表面均存在,有光感无手感的黄斑缺陷如图1所示,从用户磷化工序现场分别取回正常磷化件和有黄斑磷化件,进行表面扫描检测,分析表面形貌的差异,其磷化膜分析结果如图2、图3所示。
29