Corrosion resistance process based on control of oxide scale in whole process of hot rolling
LI Cheng-gang1, SHAN Wen-chao1, LIU Yi-si2, YANG Ming1, WANG Hao1, CAO Guang-ming1
1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China; 2. Technology Center, Hunan Valin Lianyuan Iron and Steel Co., Ltd., Loudi 417000, Hunan, China
Abstract:According to the actual working conditions of hot rolling production process,the evolution law of triple oxide iron sheet in hot rolling and coiling stage is systematically studied,aiming at improving the corrosion resistance of steel by adjusting the hot rolling production process to control the structure of oxide iron sheet and using the oxide iron sheet generated after hot rolling as protective barrier without increasing the production cost. The experimental results show that at different rolling temperatures,the structure of tri-oxide iron sheet is Fe2O3,Fe3O4 and FeO from the outside to the inside,and the proportion of FeO is the largest due to the high density of cation vacancy in FeO. With the increase of rolling temperature,the thickness of FeO layer in the iron sheet is gradually thickened,and the proportion is also gradually increased. By simulating the continuous cooling experiment,it is found that the transformation relationship of the oxide sheet structure is in the form of "C" curve. In the temperature range of 450-550 ℃,the eutectoid reaction degree of FeO reaches the peak,and it can be seen that the eutectoid transformation can be effectively inhibited by coiling at high temperature. A large number of experimental studies have shown that obtaining the structure type of complete oxide sheet with pro-eutectoid Fe3O4 is the main control direction to improve the corrosion resistance of hot-rolled steel effectively. So this article in a domestic steel strip production line based on the corrosion resistance of iron oxide control process to try rolling test and salt spray test,the results show that full dense iron oxide,and its structure type is mainly pro-eutectoid Fe3O4,so use of rolling technology to adjust the changing structure of the steel plate surface scale,steel corrosion resistant performance is improved significantly
李成刚, 单文超, 刘怡私, 杨名, 王皓, 曹光明. 基于热轧全流程氧化铁皮控制的耐蚀性工艺[J]. 钢铁, 2021, 56(9): 129-135.
LI Cheng-gang, SHAN Wen-chao, LIU Yi-si, YANG Ming, WANG Hao, CAO Guang-ming. Corrosion resistance process based on control of oxide scale in whole process of hot rolling[J]. Iron and Steel, 2021, 56(9): 129-135.
[1] 刘振宇,李志峰. 新一代热轧板带材表面氧化铁皮控制技术的现状与进展[J]. 轧钢,2020,37(1):1.(LIU Zhen-yu,LI Zhi-feng. State of the art development on technology for new generation to controlling oxide scale of hot rolled plate and strip[J]. Steel Rolling,2020,37(1):1.) [2] 张华,钱余海,齐慧滨,等. 汽车热轧钢板的锈蚀行为及预防措施[J]. 腐蚀与防护,2008,29(6):316.(ZHANG Hua,QIAN Yu-hai,QI Hui-bin et al. Rusting behavior and preventing measures of hot-rolled steel plates for automobile[J]. Corrosion and Protection,2008,29(6):316.) [3] 李美栓. 金属的高温腐蚀[M]. 北京:冶金工业出版社,2001.(LI Mei-shuan. High Temperature Corrosion of Metals[M]. Beijing:Metallurgical Industry Press,2001.) [4] Chen R Y,Yuen W Y D. Review of the high-temperature oxidation of iron and carbon steels in air or oxygen[J]. Oxidation of Metals,2003,59(5/6):433. [5] Collazo A,Nóvoa X R,Pérez C,et al. EIS study of the rust converter effectiveness under different conditions[J]. Electrochemica Acta,2008,53(25):7565. [6] Pérez F J,Martínez L,Hierro M P,et al.Corrosion behaviour of different hot rolled steels[J]. Corrosion Science,2005,48(2):472. [7] 孙彬,曹光明,贾涛,等. 热轧高强钢氧化铁皮演变规律的研究[J]. 钢铁,2010,45(11):53. (SUN Bin,CAO Guang-ming,JIA Tao,et al. Study on evolution law of oxide scale of hot-rolled high strength steel[J]. Iron and Steel,2010,45(11):53.) [8] 李鑫磊,董占斌,张跃飞,等. 轧制温度及二次除鳞对船板表面质量的影响[J]. 热加工工艺,2012,41(17):100.(LI Xin-lei,DONG Zhan-bin,ZHANG Yue-fei,et al.Influence of rolling temperature and secondary descaling on surface quality of ship plate[J]. Hot Working Technology,2012,41(17):100.) [9] Sun W H,Tieu A K,Jiang Z Y,et al. Oxide scales growth of low-carbon steel at high temperatures[J]. Journal of Materials Processing Technology,2004,155/156:1300. [10] Chen R Y,Yuen W Y D. Oxide-scale structures formed on commercial hot-rolled steel strip and their formation mechanisms[J]. Oxidation of Metals,2001,56(1/2):89. [11] Chen R Y,Yuen W Y D. A study of scale structure of hot rolled steel strip by simulated coiling and cooling[J]. Oxidation of Metals,2000,53:539. [12] Wriedt H. The Fe-O (iron-oxygen) system[J]. Journal of Phase Equilibria,1991,12(2):170. [13] Birks N,Meier G H,Pettit F S. Introduction to the High Temperature Oxidation of Metals[M]. London:Cambridge University Press,2006. [14] 杨名. 热轧流程氧化铁皮演变规律及耐蚀性能研究[D]. 沈阳:东北大学,2014.(YANG Ming. Study on the Evolution Law during Hot-rollling and Corrosion Properties of Oxide Scale on Hot-rolled Steel Plates[D]. Shenyang:Northeastern University,2014.) [15] Hidaka Y,Anraku T,Otsuka N. Deformation of iron oxides upon tensile tests at 600-1 250 ℃[J]. Oxidation of Metals,2003,59(1/2):97. [16] 顾其德,董超芳,李小刚,等. 卷曲后供氧差异对热轧带钢氧化皮组织及耐蚀性的影响[J]. 工程科学学报,2009,31(12):1564.(GU Qi-de,DONG Chao-fang,LI Xiao-gang,et al. Corrosion behavior and structure of oxide scales formed on hot rolled strips after coiling with different oxygen supplies[J]. Chinese Journal of Engineering,2009,31(12):1564.)