On-Line Correction Strategy for Processing Temperature in Ultra-fast Cooling System Under Variable Velocity Rolling

doi:10.12068/j.issn.1005-3026.2019.01.008

Abstract

Abstract: Based on the ultra-fast cooling system of a certain plant， the effect of various velocity of hot-rolled strip on the transfer coefficient and cooling time was analyzed. According to the velocity mechanism during producing， on-line corrected control strategy of velocity was developed and the calculated velocity is accurately matched the measured value. Based on the above strategies above， an on-line correction strategy for processing temperature was developed to eliminate the influence of velocity fluctuation on temperature deviation so that the accuracy to control processing temperature was improved. By proposing such on-line correction strategy to an on-site operation， the ultra-fast cooling delivery temperature and coil temperature can be well controlled， the temperature deviation affected by velocity fluctuation is effectively eliminated， and the hit rate of process temperature is more than 96%， which lays solid foundation for new product development and mass industrialized production.

Key words: hot-rolled strip, ultra-fast cooling, temperature control, on-line velocity correction, on-line temperature correction

CLC Number:

TG335.42

LI Zhen-lei， CHEN Dong， YUAN Guo， WANG Guo-dong. On-Line Correction Strategy for Processing Temperature in Ultra-fast Cooling System Under Variable Velocity Rolling[J]. Journal of Northeastern University Natural Science, 2019, 40(1): 37-42.

References

[1]王国栋.新一代控制轧制和控制冷却技术与创新的热轧过程［J］.东北大学学报(自然科学版)，2009，30(7):913-922.(Wang Guo-dong.New generation TMCP and innovative hot rolling process ［J］.Journal of Northeastern University(Natural Science)，2009，30(7):913-922.)
[2]Li Z L，Li H J，Yuan G，et al.Research and application of ultra-fast cooling system and velocity controlled strategy for hot rolled strip ［J］.Steel Research International，2015，86(5):478-488.
[3]Li Z L，Yuan G，Han Y，et al.Research on radial direction temperature change law of coil and control strategy for ultra-fast cooling ［J］.Metallurgical Research and Technology，2015，112(1):1-12.
[4]Zheng Y，Li S Y，Wang X B.Distributed model predictive control for plant-wide hot-rolled strip laminar cooling process ［J］.Journal of Process Control，2009，19(1):1427-1437.
[5]Lawrence W J，MacAlister A F，Reeve R J.Online modeling and control of strip cooling ［J］.Ironmaking and Steelmaking，1996，23(1):74-78.
[6]Wang J，Wang G D，Liu X H.Hot strip laminar cooling control model ［J］.Journal of Iron and Steel Research，International，2004，11(5):13-17.
[7]李振垒.基于超快速冷却的热轧带钢轧后冷却系统与策略研究［D］.沈阳:东北大学，2015.(Li Zhen-lei.Research of cooling control system and control strategy after rolling based on UFC for hot rolled strip［D］.Shenyang:Northeastern University，2015.)
[8]Xing G，Ding J，Chai T，et al.Hybrid intelligent parameter estimation based on grey case-based reasoning for laminar cooling process ［J］.Engineering Applications of Artificial Intelligence，2012，25(2):418-429.
[9]Wang B X，Chen X L，Tian Y，et al.Calculation method of optimal speed profile for hot plate during controlled cooling process ［J］.Journal of Iron and Steel Research，International，2011，18(5):38-41.
[10]Guo R M.Modeling and simulation of run-out table cooling control using feedforward-feedback and element tracking system ［J］.IEEE Transactions on Industry Applications，1997，33(2):304-311.
[11]Edalatpour S，Saboonchi A，Hassanpour S.Effect of phase transformation latent heat on prediction accuracy of strip laminar cooling ［J］.Journal of Materials Processing Technology，2011，211(11):1776-1782.
[12]Li H J，Li Z L，Guo Y，et al.Development of new generation cooling control system after rolling in hot rolled strip based on UFC ［J］.Journal of Iron and Steel Research，International，2013，20(7):29-34.(上接第36页)
[3]Feng Q X，Li L F，Yang W Y，et al.Microstructures and mechanical properties of hot-rolled Nb-microalloyed TRIP steels by different thermo-mechanical processes［J］.Materials Science and Engineering:A，2014，605:14-21.
[4]Fu B，Yang W Y，Lu M Y，et al.Microstructure and mechanical properties of hot-rolled C-Mn-Al-Si TRIP steels with and without Nb based on dynamic transformation［J］.Materials Science and Engineering:A，2012，536:265-268.
[5]Jun H J，Park S H，Choi S D，et al.Decomposition of retained austenite during coiling process of hot rolled TRIP-aided steels［J］.Materials Science and Engineering:A，2004，379:204-209.
[6]Park H S，Seol J B，Lim N S，et al.Study of the decomposition behavior of retained austenite and the partitioning of alloying elements during tempering in CMnSiAl TRIP steels［J］.Materials and Design，2015，82:173-180.
[7]Sugimoto K I，Usui N，Kobayashi M，et al.Effect of volume fraction and stability of retained austenite on ductility of TRIP-aided dual-phase steels［J］.ISIJ International，1992，32(12):1311-1318.
[8]Dijk N H，Butt A M，Zhao L，et al.Thermal stability of retained austenite in TRIP steels studied by synchrotron X-ray diffraction during cooling［J］.Acta Materialia，2005，53:5439-5447.
[9]Godet S，Jacques P J.Beneficial influence of an intercritically rolled recovered ferritic matrix on the mechanical properties of TRIP-assisted multiphase steels［J］.Materials Science and Engineering:A，2015，645:20-27.
[10]Hosseini S M K，Abbass Z H，Steve Y.Effect of austenite deformation in non-recrystallization region on microstructure development in low-silicon content TRIP-assisted steels［J］.Materials Science and Engineering:A，2014，618:63-70.