冷轧MR T-5钢镀锡原板表面条状色差的产生原因与控制  

Cause and Control for Linear Chromatism on Cold-rolled MR T-5 Steel Uncoated Tinplate Base

作　　者：刘云峰[1] 彭兴东[2] LIU Yunfeng;PENG Xingdong(Cold Rolled Strip Steel Plant,Shanghai Meishan Iron&Steel Co.,Ltd.,Nanjing Jiangsu 210039,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan Liaoning 114051,China)

机构地区：[1]上海梅山钢铁股份有限公司冷轧厂,江苏南京210039 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051

出　　处：《上海金属》2021年第4期27-33,共7页Shanghai Metals

摘　　要：某企业冷轧的MR T-5钢镀锡原板表面呈现出条状色差,会影响镀层的均匀性和生产节奏。为查明条状色差的产生原因,采用表面粗糙度检查仪、三维轮廓显微镜和扫描电子显微镜研究了条状色差的微观形貌、轧机工作辊面和酸洗后板面的粗糙度分布及乳化液润滑均匀性。结果表明:条状色差是镀锡原板表面微观形貌差异所致,而原板表面微观形貌差异主要是冷轧时板面摩擦润滑不均匀造成的。采用接触角为49.6°的乳化液有利于改善冷轧时乳化液润滑均匀性,从而改善冷轧时板面摩擦润滑的均匀性。改进的乳化液的技术参数为:浓度(质量分数)1号槽(2.2±0.2)%、3号槽(4.2±0.2)%;温度56~60℃;铁粉含量(200~380)×10^(-6);D50粒径11.5~13.5μm;稳定性指数30%~38%。采用优化的乳化液后,MR T-5钢镀锡原板表面的条状色差明显减少。In one enterprise,cold-rolled uncoated tinplate base of MR T-5 steel exhibited linear chromatism which will have an influence on both tin coating uniformity and production rhythm.To find out the reason why the linear chromatism formed,its microscopic pattern,roughness distribution of the mill working roll surfaces and the uncoated tinplate base surface after pickling and homogeneity of the emulsion lubricating were investigated by using surface roughness tester,threedimensional profile microscope and scanning electronic microscope.The results showed that the linear chromatism stemmed from difference in microscopic patterns of the uncoated tinplate base surface which was mainly traced to nonuniform friction and lubrication of its surface during cold-rolling.The use of an emulsion whose contact angle was 49.6°was beneficial to improvements in its lubricating homogeneity thereby in homogeneity of friction and lubrication of the uncoated tinplate base surface during cold-rolling.Technical parameters of a modified emulsion were as follows:concentration(mass fraction)of(2.2±0.2)% for tank No.1 and(4.2±0.2)% for tank No.3;temperature of 56 to 60℃;iron powder content of 200×10^(-6) to 380×10^(-6);graininess(D50)of 11.5 to 13.5μm;stability index of 30% to 38%.The linear chromatisms on the cold-rolled uncoated tinplate base of MR T-5 steel have been reduced obviously due to the use of the optimized emulsion.

关 键 词：冷轧 镀锡原板 条状色差 润滑 

分 类 号：TQ153.13[化学工程—电化学工业]