基于DSCCR生产工艺的终轧温度对轧制过程中低碳钢组织与性能影响分析  

Effect of finish rolling temperature on microstructure and properties of low carbon steel based on DSCCR production process

作　　者：李朝阳 赵志鹏 田鹏 梁晓慧 王书桓 康永林[3] LI Chaoyang;ZHAO Zhipeng;TIAN Peng;LIANG Xiaohui;WANG Shuhuan;KANG Yonglin(School of Metallurgy and Energy,North China University of Scienceand Technology,Tangshan 063210,Hebei,China;CollaborativeInnovation Center of Steel Technology,University of Science andTechnology Beijing,Beijing 100083,China;School of MaterialsScience and Engineering,University of Science and TechnologyBeijing,Beijing 100083,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]北京科技大学钢铁共性技术协同创新中心,北京100083 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2023年第12期113-122,共10页Journal of Materials Engineering

摘　　要：基于东华连铸连轧生产线(Donghua steel continuous casting rolling,DSCCR)分别进行终轧温度为880,820℃和780℃的热轧实验,研究终轧温度对低碳钢组织和性能的影响。采用光学显微镜(optical microscope,OM)、扫描电子显微镜(scanning electron microscope,SEM)、电子背散射衍射(electron backscatter diffraction,EBSD)技术等表征手段观察分析了不同终轧温度下热轧带钢的微观组织,同时对热轧带钢的拉伸力学性能进行测试和分析,对比分析不同终轧温度条件下热轧带钢的屈服强度、抗拉强度和伸长率的变化情况。此外,还对不同终轧温度下热轧带钢的氧化铁皮厚度进行测定。结果表明:随着终轧温度的降低,带钢屈强比及伸长率都降低,屈强比由880℃时的0.8~0.81降低至780℃时的0.75~0.79,伸长率由880℃时的40%下降到780℃时的27%,应变硬化指数n值也从880℃时的0.22下降到780℃时的0.17;同时,对不同终轧温度下热轧带钢氧化铁皮进行观察分析,随着终轧温度的降低,氧化铁皮厚度减小,氧化铁皮厚度由880℃时的10.2μm下降至780℃时的8.8μm,降幅达13.7%,氧化铁皮的降低可提高后续酸洗效率,降低酸洗消耗。Based on Donghua steel continuous casting rolling(DSCCR)production line,hot rolling tests rolled at 880,820℃and 780℃were carried out to study the effect of finish rolling temperature on microstructure and properties of low carbon steel.OM,SEM,EBSD and other characterization methods were used to observe and analyze the microstructure of hot rolled strip at different finish rolling temperatures.Meanwhile,the tensile properties of hot rolled strip were tested and analyzed,and the changes of yield strength,tensile strength and elongation of hot rolled strip at different finish rolling temperatures were compared and analyzed.In addition,the thickness of iron oxide scale of hot rolled strip at different finish rolling temperatures was also measured.The results show that with the decrease of finish rolling temperature,the tensile strength ratio and elongation ratio of the strips decrease from 0.8-0.81 at 880℃to 0.75-0.79 at 780℃,the elongation of the strips decrease from 40%at 880℃to 27%at 780℃,and n value(strain-hardening exponent)decreases from 0.22 at 880℃to 0.17 at 780℃.At the same time,the iron oxide scale of hot rolled strip steel was observed and analyzed.With the decrease of finish rolling temperature,the thickness of the iron oxide scale decreases from 10.2μm at 880℃to 8.8μm at 780℃,and the decrease of the iron oxide scale sheet can improve the subsequent pickling efficiency and reduce the consumption of pickling.

关 键 词：DSCCR 低碳钢 终轧温度 氧化铁皮 微观组织 

分 类 号：TG335.11[金属学及工艺—金属压力加工]