冷轧MR T-4钢镀锡原板表面划伤的原因和控制  

Cause and Control of Scratch on Cold-rolled Uncoated Tinplate Base of MR T-4 Steel

作　　者：刘云峰[1] 王东[2] 彭兴东[2] LIU Yunfeng;WANG Dong;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6期7-13,共7页Shanghai Metals

摘　　要：冷轧MR T-4钢镀锡原板表面有划伤。采用三维轮廓显微镜和扫描电子显微镜观察了划伤的微观形貌,使用四球极压试验机检测了两种轧制油的油膜高温强度,目的是弄清表面划伤的原因从而采取控制措施。结果表明:MR T-4钢镀锡原板表面划伤是冷轧时辊缝区润滑不充分造成的。采用油膜高温强度大于94 kg的1号轧制油,以及采用第2~5架轧机之间的钢板冷却系统,并使每个系统的乳化液流量达到1629 L/min,已使冷轧MR T-4钢镀锡原板的表面划伤明显减少。现场使用乳化液的技术条件为:1号和3号槽乳化液浓度(质量分数)相应为(2.3±0.2)%和(4.5±0.2)%,乳化液温度为56~58℃,铁粉含量为(200~380)×10^(-6);氯离子含量不大于25×10^(-6);乳化液稳定性指数为30%~38%。Cold-rolled uncoated tinplate base of MR T-4 steel exhibited scratches on its surface.The microscopic pattern of the scratch was observed by means of three-dimensional profile microscope and scanning electronic microscope,and two kinds of rolling oil were tested for high-temperature strength of their film by a four-ball extreme pressure tester,for the purpose of clarifying the cause for the surface scratch thus adopting measure to control it.The results showed that the scratch on uncoated tinplate base of MR T-4 steel was caused by insufficient lubrication in the roll gap area during cold rolling.The scratches on cold-rolled uncoated tinplate base of MR T-4 steel have been considerably reduced by the use of rolling oil No.1 whose high temperature strengths of oil film was greater than 94 kg as well as by using the cooling systems for steel plate between the rolling mills No.2 and No.5 and allowing the emulsion flow rate in every cooling system to reach 1629 L/min.The specifications of the emulsion used in working site were as follows:concentration(mass fraction)of(2.3±0.2)%for tank No.1 and of(4.5±0.2)%for tank No.3,emulsion temperatures ranging from 56 to 58℃,content of iron powder ranging from 200×10^(-6) to 380×10^(-6),chlorion content of 25×10^(-6) or less,and stability index of the emulsion ranging from 30%to 38%.

关 键 词：冷轧 镀锡原板 划伤 润滑 

分 类 号：TG115[金属学及工艺—物理冶金]