VCR and ASR technology for profile and flatness control in hot strip mills

  • Jian-guo Cao (닜붨맺)Email author
  • Gang-cheng Wei (캺룖돇)
  • Jie Zhang (헅뷜)
  • Xian-lin Chen (돂쿈쇘)
  • Yi-zhong Zhou (훜튻훐)


The roll contour pattern and variety of work and backup rolls in service and its effect on profile and flatness control performance in 1 700 mm hot strip mill at Wuhan Iron and Steel (Group) Corporation were tested and analyzed by the developed finite element models of different typical roll contours configurations. A rather smooth local work roll contour near strip edges and an increase in rolled length can be obtained by application of long stroke work roll shifting system with conventional work roll contours that is incapable of the crown control. In comparison with the conventional backup and work roll contours configuration, the crown control range by the roll bending force enhances by 12.79% and the roll gap stiffness increases by 25.26% with the developed asymmetry self-compensating work rolls(ASR) and varying contact backup rolls(VCR). A better strip profile and flatness quality, an increase in coil numbers within the rolling campaign and a significant alleviated effect of severe work roll wear contours on performance of edge drop control are achieved by the application of ASR with crown control and wear control ability in downstream stand F5 and VCR in all stands of 1 700 mm hot strip mill.

Key words

hot rolling mill strip profile and flatness control wear finite element analysis 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    CHEN Xian-lin. Flatness control in new generation high-tech mills for wide strip rolling [J]. Journal of University of Science and Technology Beijing, 1997, 19(S1): 1–4. (in Chinese)MathSciNetGoogle Scholar
  2. [2]
    SHIMIZU Y, IWATANI J, YAMASAKI Y, TAKEGUCHI T, KAMETANI A. Development of new hot rolling process for thin strip rolling [J]. Technical Review-Mitsubishi Heavy Industries, 2000, 37(2): 45–47.Google Scholar
  3. [3]
    SEILINGER A, MAYRHOFER A, KAINZ A. SmartCroum—A new system for improved profile and flatness control [J]. Aluminium International Today, 2003, 15(2): 26–28.Google Scholar
  4. [4]
    CAO Jian-guo, CHEN Xian-lin, ZHANG Qing-dong, HE An-rui. Roll wear pattern and appraisal of roll contour in hot wide strip mill [J]. Journal of University of Science and Technology Beijing, 1999, 21(2): 188–190, 194. (in Chinese).Google Scholar
  5. [5]
    ZHANG Xiao-ming, JIANG Zheng-yi, TIEU A K, LIU Xiang-hua, WANG Guo-dong. Numerical modeling of the thermal deformation of CVC roll in hot strip rolling [J]. Journal of Materials Processing Technology, 2002(130/131): 219–223.Google Scholar
  6. [6]
    GINZBURG V B. High-quality steel rolling: Theory and practice [M]. New York: Marcel Dekker Inc, 1993.CrossRefGoogle Scholar
  7. [7]
    DEREK A S, PATRICK J M, CARLOS J M, ROBCRT J A, RODNEY R A. Control strategies for high production and quality: US steel Gary 84-in. hot strip mill [J]. Iron and Steel Engineer, 1998, 75(6): 31–39.Google Scholar
  8. [8]
    JOHN S, SIKDAR S, MUKHOPADHYAY A, PANDIT A. Roll wear prediction model for finishing stands of hot strip mill [J]. Ironmaking and Steelmaking, 2006, 33(2): 169–175.CrossRefGoogle Scholar
  9. [9]
    CAO Jian-guo, ZHANG Jie, GAN Jian-bin, SU Yi, TANG Ben-li, YAN Tan-li. Work roll wear prediction model of non-oriented electrical steel sheets in hot strip mills [J]. Journal of University of Science and Technology Beijing, 2006, 28(3): 286–289. (in Chinese)Google Scholar
  10. [10]
    XU Le-jiang, XU Yao-huan, ZHANG Yong, HUA Jian-xin, CHEN Xian-lin, ZHANG Jie, YANG Quan, ZHANG Qing-dong. CVC technology in China’s largest cold strip mill [J]. Steel Technology International, 1994/1995(yearly): 203–208.Google Scholar
  11. [11]
    CHEN Lian-sheng, HUANG Chuan-qing, LIAN Jia-chuang. Comparative analysis on predicted and measured wears of PFC at finishing rolling train of 2050 hot rolling mill [J]. Research on Iron and Steel, 2000(1): 24–27. (in Chinese)Google Scholar
  12. [12]
    ARATANI H, OZONO R, NAKANO T. Expansion of pair cross (PC) mill applications to hot and cold rolling mills [J]. Iron and Steel Engineer, 1993, 70(3): 32–37.Google Scholar
  13. [13]
    GINZBURG V B, AZZAM M. Selection of optimum strip profile and flatness technology for rolling mills [J]. Iron and Steel Engineer, 1997, 74(7): 30–38.Google Scholar
  14. [14]
    PENG Yan, LIU Hong-min. Study on increasing calculation precision and convergence speed of streamline strip element method [J]. Journal of Central South University of Technology, 2004, 11(1):105–108.CrossRefGoogle Scholar
  15. [15]
    PENG Yan, LIU Hong-min, WANG Dong-cheng. Simulation of type selection for 6-high cold tandem mill based on shape control ability [J]. Journal of Central South University of Technology, 2007, 14(2):278–281.CrossRefGoogle Scholar
  16. [16]
    CHEN Xian-lin, ZOU Jia-xiang. A specialized finite element model for investigating controlling factors affecting behavior of rolls and strip flatness [C]// Proceedings of the 4th International Conference on Steel Rolling. Deauville: 1987, E4.1–E4.7Google Scholar
  17. [17]
    CAO Jian-guo, ZHANG Jie, SONG Ping, SU Yi, YAN Tan-li. ASR technology for controlling profile and flatness of non-oriented electrical steel strip in hot rolling [J]. Iron and Steel, 2006, 41(6):43–46. (in Chinese)Google Scholar
  18. [18]
    CHEN Xian-lin, YANG Quan, ZHANG Qing-dong, ZHANG Jie, CUI Zhen-bin, GUO Lei, LIU He, YANG Da-ke, XU Le-jiang, XU Yao-huan. Varying contact backup roll for improved strip flatness [J]. Steel Technology International, 1994/1995(yearly): 174–178.Google Scholar
  19. [19]
    CHEN Xian-lin, ZHANG Jie, ZHANG Qing-dong, WANG Chang-song, YANG Quan, LIU Ben-ren, WANG Ling, WEI Gang-cheng, HUANG Si-qing, YANG Jin-an. Development in profile and flatness control system of hot strip mills [J]. Iron and Steel, 2000, 35(7): 28–33. (in Chinese)Google Scholar
  20. [20]
    CAO Jian-guo, ZHANG Jie, CHEN Xian-lin, WEI Gang-heng. Control of roll contour for strip profile and flatness in hot rolling [C]// 44th Mechanical Working and Steel Processing Conference Proceedings & 8th International Conference on Steel Rolling Proceedings. Florida, 2002: 1001–1010.Google Scholar
  21. [21]
    WILMS W, VOGTMANN L, KLŌCKNER J, BEISEMANN G, ROHDE W. Profile and flatness control in hot strip mills [J]. Metallurgical Plant Technology, 1985, 8(6): 74–90.Google Scholar

Copyright information

© Central South University 2008

Authors and Affiliations

  • Jian-guo Cao (닜붨맺)
    • 1
    Email author
  • Gang-cheng Wei (캺룖돇)
    • 1
    • 2
  • Jie Zhang (헅뷜)
    • 1
  • Xian-lin Chen (돂쿈쇘)
    • 1
  • Yi-zhong Zhou (훜튻훐)
    • 2
  1. 1.School of Mechanical EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Wuhan Iron and Steel (Group) CorporationWuhanChina

Personalised recommendations