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Study and Application of Bottom Blowing Technique of Combined Blowing Converter

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Journal of Iron and Steel Research International 2014年第1期21卷 41-45页

作者： Li-bin YANG Liu LIU Xing-li JIAO Pu-qiao TONG Central Iron and Steel Research Institute No.4steelmaking and rolling General Plant Masteel

The water modelling experiments of 300 t converter concerning combined blowing parameters, the number, and configuration of bottom nozzles are carried out. The results show that the arrangement of 16 bottom nozzles at 0. 40D and 0. 45D （hearth diameter） concentric circles is the reasonable solution. The combined blowing steel- making technique of 300 t converter has been developed through experiments and studies relating to optimizing the top-bottom combined blowing pattern, the number and configuration of the bottom nozzles, the type selection of bot- tom nozzle, and bottom nozzle maintenance techniques. The results show that the product of w[c] ＂ w[o] at endpoint is reduced from 0. 002 62 to 0. 002 43, average TFe content is decreased by %, phosphorus distribution is raised from 70.85 to 78.95, sulfur distribution is raised from 3.43 to 4.32 and manganese content is raised by 0.02%.

关键词： combined blowing bottom nozzle maintenance technique water model product of carbon and oxygen

Optimal design of hot rolling process for C-Mn steel by combining industrial data-driven model and multi-objective optimization algorithm

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Journal of Iron and Steel Research International 2018年第7期25卷 700-705页

作者： Si-wei Wu Xiao-guang Zhou Jia-kuang Ren Guang-ming Cao Zhen-yu Liu Nai-an Shi State Key Laboratory of rolling and Automation Northeastern University Shenyang 110819 Liaoning China Continuous rolling Plant of No. 3 steelmaking of Angang Co. Ltd. Anshan 114021 Liaoning China

A successful mechanical property data-driven prediction model is the core of the optimal design of hot rolling process for hot-rolled strips. However, the original industrial data, usually unbalanced, are inevitably mixed with fluctuant and abnormal values. Models established on the basis of the data without data processing can cause misleading results, which cannot be used for the optimal design of hot rolling process. Thus, a method of industrial data processing of C-Mn steel was proposed based on the data analysis. The Bayesian neural network was employed to establish the reliable mechanical property prediction models for the optimal design of hot rolling process. By using the multi-objective optimization algorithm and considering the individual requirements of costumers and the constraints of the equipment, the optimal design of hot rolling process was successfully applied to the rolling process design for Q345B steel with 0.017% Nb and 0.046% Ti content removed. The optimal process design results were in good agreement with the industrial trials results, which verify the effectiveness of the optimal design of hot rolling process.

关键词： Industrial data Data processing - Mechanical property Optimal design Hot rolling process C-Mn steel

Monitor automatic gauge control strategy with a Smith predictor for steel strip rolling

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Journal of University of Science and Technology Beijing 2008年第6期15卷 827-832页

作者： Dianhua Zhang Hao Zhang Tao Sun Xu Li State Key Lab of rolling Technology and Automation Northeastern University Shenyang 10004 China Cold rolling factory Tangshan Iron ＆ Steel Group Co. Ltd. Tangshan 063016 China

The simplified transfer function diagram block for a monitor automatic gauge control （Mon-AGC） system of strip steel rolling process was investigated. The new notion of strip sample length was given. In this way, the delay time varying with the rolling speed was evaded. After a Smith predictor was used to monitor the AGC system, the control laws were deduced for both proportional and integral regulators. The control strategies showed that by choosing the controller parameter P=∞ for both control algo- rithms each regulator could compensate the whole strip gage error in the first control step. The result shows that the integral algo- rithm is more controllable for the system regulating process and has a better steady-state precision than the proportional regulator. Compared with the traditional control strategy, the new control laws have a faster response speed and a hieher steadv-state precision.

关键词： time delay system Smith predictor (SP) automatic gauge control steel strip rollling

Process Analysis and Practice of Clean IF Steel Production

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Journal of Iron and Steel Research International 2011年第S2期18卷 399-405页

作者： TIAN Yong, AN Lian-qi, JIAN Long, MAO Zhi-yong, GUO Meng, WANG Peng, LI Zhen, WEN Tie-guang ( No.3 steelmaking and Continuous rolling Plant, Angang Steel Co Ltd, Anshan, 114021,Liaoning,China ) Angang Steel Co Ltd Steelmaking & Continuous Rolling Plant 3 Anshan 114021 Liaoning Peoples R China

Based on the current process and equipment conditions of No.3 steelmaking and continuous rolling plant, which consists of desulphurization and slag skimming of hot metal, 260t combined blown BOF, rimmed steel tapping with slag stopping process, RH-TB vacuum treatment process and medium thin slab continuous casting, the methods for improving cleanliness of IF steel in BOF smelting, RH vacuum treatment and continuous casting were investigated. According to results of theoretical analysis and experiments, a series of quality controlling schemes were proposed for improving cleanliness of IF steel via controlling chemical composition, T[O] content, tapping temperature, shrouded casting and controlling stability of continuous casting.

关键词： IF steel clean steel steelmaking secondary refining continuous casting

Multi-objective collaborative optimization of metallurgical properties of iron carbon agglomerates using response surface methodology

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International Journal of Minerals,Metallurgy and Materials 2021年第12期28卷 1917-1928页

作者： Ji-wei Bao Zheng-gen Liu Man-sheng Chu Dong Han Lai-geng Cao Jun Guo Zi-chuan Zhao School of Metallurgy Northeastern UniversityShenyang 110819China Institute for Frontier Technologies of Low-carbon steelmaking Northeastern UniversityShenyang 110819China Liaoning Province Engineering Research Center for Technologies of Low-Carbon steelmaking Northeastern UniversityShenyang 110819China State Key Laboratory of rolling and Automation Northeastern UniversityShenyang 110819China

Iron carbon agglomerates(ICA)are used to realize low-carbon blast furnace *** this study,the central composite design based on response surface methodology was used to synergistically optimize the compressive strength,reactivity,and post-reaction strength of *** show that the iron ore addition ratio significantly influences the compressive strength,reactivity,and post-reaction strength of *** iron ore addition ratio and carbonization temperature or the iron ore addition ratio and carbonization time exert significant interaction effects on the compressive strength and reactivity of ICA,but it has no interaction effects on the post-reaction strength of *** addition,the optimal process parameters are as follows:iron ore addition ratio of 15.30 wt%,carbonization temperature of 1000℃,and carbonization time of 4.27 *** model prediction results of compressive strength,reactivity,and post-reaction strength are 4026 N,55.03%,and 38.24%,respectively,which are close to the experimental results and further verify the accuracy and reliability of the models.

关键词： strength carbon surface

Numerical simulation of slag layer and its distribution on hot surface of copper stave based on ANSYS birth-death element technology

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Journal of Iron and Steel Research International 2021年第5期28卷 507-519页

作者： Quan Shi Jue Tang Man-sheng Chu School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Institute for Frontier Technologies of Low-Carbon steelmaking Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The core of the long-life copper stave was to ensure the stability of the slag layer,and the uniform distribution of the slag layer was beneficial to restrict the generation of the overthick slag layer.A novel model for calculating the thickness and distribution of the slag layer in the part of copper stave was established based on the finite element theory through the ANSYS birth-death element *** distribution and thickness of the slag layer on the hot surface of copper stave were calculated and analyzed when the gas temperature and slag properties tended to be changed,which was applied to characterize the slag-hanging capability of copper stave with the changes of furnace *** was shown that the thickness of hot surface slag layer in the part of copper stave decreased obviously while the temperature of stave body raised rapidly with increasing gas *** the gas temperature was 1400℃,the inlaid slag layer was gradually melted,and the maximum temperature of the stave body was closed to 120℃.The change of gas temperature was very sensitive to the adherent dross capability of copper stave which would be enhanced by the promotion of slag-hanging ***,when the slag-hanging temperature was 1150℃and the gas temperature was lower than 1250℃,the overlhick slag layer was easily formed on the hot surface of the copper stave,and its stability was *** improvement in the thermal conductivity of slag could be conducive to the formation of the uniform and stable slag layer on the hot surface of copper stave,especially in the dovetail *** the thermal conductivity of the slag was greater than 1.8 W m^(-2)℃^(-1),the inlaid slag layer in the dovetail groove was not melted,although the gas temperature reached 1500℃.

关键词： Copper stave Heat transfer Birth-death element Numerical simulation Slag-hanging capability

Research and Application of Tundish Casting Auto-Start Technology on Slab Casters

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Journal of Iron and Steel Research International 2011年第S2期18卷 251-255页

作者： YANG Zhi-zheng1,2, WANG Yan-feng2, RAO Jiang-ping2, SUN Yun-hu2, YANG Dong-ming2 (1. R&D WISCO, Wuhan 430081, Hubei, China 2. General steelmaking factory of WISCO, Wuhan 430083, Hubei, China) R&D WISCO Wuhan 430081 Hubei Peoples R China Gen steelmaking factory WISCO Wuhan 430083 Hubei Peoples R China

Based on introducing equipments and technology conditions of continuous casting plant of the 4th sub-factory of general steelmaking factory of WISCO, the operation of tundish casting auto-start, control of withdrawal straightening device drive start and control of mould level are analyzed, the critical effect of liquid level control is emphasized in this part. Through comprehensive industrial scale experiments, several relevant problems were solved in application process, which promoted the rate of auto-casting of the factory to beyond 98 percent stably from 39 at the beginning.

关键词： casting auto-start stopper, mould level control system

Evolution behavior and mechanism of iron carbon agglomerates under simulated blast furnace smelting conditions

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Journal of Iron and Steel Research International 2023年第9期30卷 1714-1731页

作者： Ji-wei Bao Man-sheng Chu Zheng-gen Liu Wei Lv Dong Han Li-feng Zhang School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Institute for Frontier Technologies of Low-Carbon steelmaking Northeastern UniversityShenyang 110819LiaoningChina Liaoning Province Engineering Research Center for Technologies of Low-Carbon steelmaking Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

Iron carbon agglomerates(ICA)are the composite burden for low-carbon blast furnace(BF)*** order to optimize the reactivity of ICA according to the evolution characteristics of ICA in the BF smelting process,the evolution behavior and mechanism of different reactive ICA under simulated BF smelting conditions were *** results show that the existence of more sillimanite and aluminosilicate and less active sites of metallic iron will weaken gasification reaction and carburization ability of ICA-1(containing 10%iron ore).It weakens the promoting effect of ICA-1 on the reduction,softening,and melting of ferrous burdens and the dripping of *** aluminosilicate with a high melting point decreases,the low melting point slag phase and Fe–Si alloy increase,and many active sites of metallic iron exist,which strengthen the gasification reaction and carburization ability of ICA-2(containing 30%iron ore).The promoting effect of ICA-2 on the reduction,softening,and melting of ferrous burdens and the dripping of slag-iron is significantly *** gasification reaction capacity of ICA-3(containing 35%iron ore)is reduced,and the improvement in ICA-3 on the softening–melting performance of mixed burdens is *** appropriate proportion of iron ore in ICA is about 30%.

关键词： Iron carbon agglomerate Reactivity Evolution behavior Evolution mechanism Blast furnace Softening–melting–dripping property

Development on Technique of Tube Reducing in Double 3-Roll Dies

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International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 55-57页

作者： Baolong Zheng Li Sun Ruichen An , Lianshi Li Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China No. 1 Steel rolling factory, Tangshan Iron and Steel Corporation, Tangshan 063000, China Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China No.1 Steel rolling factory Tangshan Iron and Steel Corporation Tangshan 063000 China

Based on the experiments, a new technique of reducing tube with two linked 3-roll roller dies was developed. The external friction conditions, velocity and the non-uniform deformation of metal were distinctly improved, and the friction between metal and tool was decreased. Corrosion strip layers and photo-elastic coatings methods were adopted in the experiment for measuring residual stress, and the residual stresses in the drawn tube with 3-roll dies are reduced.

关键词： reducing tube roller dies drawing deformation