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Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and Materials Science Hubei Engineering UniversityXiaogan 432000China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

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Determination of Interfacial Heat Flux of Stainless Steel Solidification on Copper Substrate During the First 0.2 s

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Journal of Shanghai Jiaotong university(Science) 2011年第1期16卷 65-70页

作者：张卫于艳方园李建国 School of Materials Science and Engineering Shanghai Jiaotong University baosteel Research institute Baosteel Co. Ltd

Interfacial heat transfer is a key issue in many solidification *** the paper,a novel experimental apparatus has been designed and on this basis,the instantaneous interfacial heat transfer between molten steel or solidified shell and copper substrate during the first 0.2 s has been *** investigated parameters include melt superheat,substrate temperature and surface *** results show that the peak value of the interfacial heat flux in the first stage of liquid/solid contact increases with melt superheat and changes slightly with substrate temperature and surface *** interfacial heat flux in the stage of solid/solid contact has a similar trend of slow decrease in most conditions.

关键词： rapid solidification interfacial heat transfer heat flux

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Effect of Coating on Instantaneous Interfacial Heat Transfer During Near-Rapid Solidification

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Journal of Iron and Steel Research International 2011年第11期18卷 67-73页

作者： ZHANG Wei YU Yan FANG Yuan LI Jian-guo School of Materials Science and Engineering Shanghai Jiaotong University Shanghai 200240 China baosteel Research institute Baosteel Co Ltd Shanghai 201900 China

For many rapid or near-rapid solidification processes, the interracial heat transfer between the melt and the substrate is a key issue on the cooling and solidification rate of castings. For the purpose of controlling and adjusting of the interfacial thermal resistance, the effects of C/BN, Zn and organic coatings on the instantaneous interracial heat flux and the solidified structure of AISI304 stainless steel solidification on copper substrate have been investiga- ted by using an experimental simulator. The results show that C/BN coatings can improve the uniformity of heat flux and solidified structure; Zn coating can increase the heat flux and solidification rate in the growth stage of the solidified shell; organic coating will decrease the heat flux and the solidification rate and make re-melted structure on the surface of the solidified shell.

关键词： near rapid solidification interracial heat transfer coating

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High-temperature fatigue behavior of 15CrNbTi ferritic stainless steel

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Journal of Iron and Steel Research International 2019年第3期26卷 285-291页

作者： Tian-long Liu Li-jia Chen Hong-yun Bi Xin Che School of Materials Science and Engineering Shenyang University of Tech no logy Shenyang 110870 Liaoning. China baosteel Central Research institute Baosteel Co..Ltd.Shanghai 201900China

In order to investigate the high-temperature fatigue and fatigue-creep behavior of 15CrNbTi ferritic stainless steel at 800°C,fatigue tests without holding time in laboratory air and with 10 s holding time induced at maximum cyclic stress under argon atmosphere were conducted on an electrohydraulic servo fatigue testing *** addition,the morphologies of fatigue fracture surfaces were observed,and the precipitates and dislocation substructures were *** experimental results show that the fatigue limit of 15CrNbTi ferritic stainless steel is 30 MPa at 800°*** fatigue life of the experimental steel obviously decreases if holding time of 10 s is introduced at maximum cyclic *** two test conditions,the fatigue cracks transgranularly initiate at the free surface of fatigue specimens and then propagate in a transgranular *** is dem on strated that three kinds of precipitates inclu ding(Nb,Ti)C phase,Fe2Nb phase and Fe3Nb3C phase can be observed in 15CrNbTi ferritic stainless steel,and the Fe2Nb and Fe3Nb3C phases are mainly precipitated during the fatigue *** the fatigue deformation area,both dislocation tangles and dislocation arrays are ***,the sub-grains which form during the cycling deformation with holding time of 10 s are also ***,the formation of sub-grains leads to the deterioration of the fatigue life of 15CrNbTi steel.

关键词： Ferritic stainless steel-High-temperature fatigue Holding time Fatigue fracture Precipitate Dislocation substructure

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Effects of Alloy Elements on Oxidation Resistance and Stress-Rupture Property of P92 Steel

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Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 129-138页

作者： Gang Liu Yu-Lai Xu Cai-Xiong Yang Xue-Shan Xiao Xi-Min Chen Xiao-Ke Zhang Xiang-Jun Meng Laboratory for Microstructures Institute of Materials Shanghai University baosteel Special Materials Co. Ltd

Effects of alloy elements Cr, W, Ce, and Si on oxidation behavior at 750℃ in air and stress-rupture properties of P92 steel have been investigated. The proper increase in elements Cr, W, and Ce improved to varying degrees both oxidation resistance by either facilitating more protective Cr2O3 or modifying surface morphologies and stress-rupture life largely attributed to the formation of fine Laves phase. The excessive addition of Si significantly improved oxidation resistance of P92 steel, but dramatically impaired the stress-rupture life due to the formation and coarsening of Laves phase. The results indicate that proper additions of Cr, W, and Ce are beneficial for the comprehensive property of P92 steel.

关键词： P92 Oxidation resistance Stress-rupture property Microstructure

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INDIRECT ACCELERATED ADAPTIVE FUZZY CONTROLLER

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Chinese Journal of Mechanical Engineering 2008年第1期21卷 91-93页

作者： ZHU Liye FANG Yuan ZHANG Weidong baosteel Research institute Shanghai 201900 China Department of Automation Shanghai Jiaotong University Shanghai 200240 China

According to a type of normal nonlinear system, an indirect adaptive fuzzy （IAF） controller has been applied to those systems where no accurate mathematical models of the systems under control are available. To satisfy with system performance, an indirect accelerated adaptive fuzzy （IAAF） controller is proposed, and its general form is presented. The general form IAAF controller ensures necessary control criteria and system＇s global stability using Lyapunov Theorem. It has been proved that the close-loop system error converges to a small neighborhood of equilibrium point. The optimal IAAF controller is derived to guarantee the process＇s shortest settling time. Simulation results indicate the IAAF controller make the system more stable, accurate, and fast.

关键词： Indirect adaptive fuzzy controller Accelerated controller Stability System error Settling time

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Definition and Verification of Shape Meter Method

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Journal of Iron and Steel Research International 2002年第2期9卷 53-57页

作者： ZHANG Jin-zhi DUAN Chun-hua ZHU Jian-qin Central Iron&Steel Research institute Shanghai baosteel Group Co

Based on quantitative microscopic examinations of welds and welding rate for different steels (40Cr and T10A) joint, which possess the ultra fine microstructure after high frequency hardening (HFH) and salt bath cyclic quenching (SCQ), the suitable defect grey scale threshold value was determined, and the welding rate of superplastic solid state welding of different steels (40Cr and T10A steel) was systematically inspected and analyzed by means of self made ultrasonic imaging inspection system. The experimental results showed that the superplastic solid state weld of different steels can be inspected more accurately, reliably and quickly by this system, and the results were in good accordance with that of metallographic observation. The welding rate of superplastic welding is in linear relation with tensile strength of joint.

关键词： superplastic solid state welding welding rate ultrasonic nondestructive testing

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Hot-dip Galvanizing of Carbon Steel after Cold Rolling with Oxide Scale and Hydrogen Descaling

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Journal of Iron and Steel Research International 2014年第2期21卷 222-226页

作者： Yong-quan HE Tao JIA Xiao-jiang LIU Guang-ming CAO Zhen-yu LIU Jun LI State Key Laboratory of Rolling and Automation Northeastern University baosteel Research institute

A new processing method for producing hot dip galvanized steel is designed and tested, in which pickling is skipped. Hot-rolled low carbon steel sheets are roiled with oxide scale in an experimental mill at room temperature, prior to annealing under a 20% hydrogen reducing atmosphere and galvanizing on a hot-dip galvanizing simulator. Micro-cracks formed in the oxide scale during cold rolling roughen the steel surface and enlarge the specific surface. Through-thickness cracks provide transport channels for hydrogen, and hence the reduction of oxide scale is en- hanced. When the sheet is dipped in the zinc bath, cracks are submerged by liquated zinc and the defects are not dis- tinct after hot-dip galvanizing. The overlay coating occludes with rough surface of the sheet, whereby a superior coat- ing adherence is realized.

关键词： oxide scale acid free cleaning cold rolling reducing annealing hot-dip galvanizing

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Nanocrystallization of Cementite in 0.4C-1Cr Steel During High-Power Surface Processing

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Journal of Wuhan University of Technology(Materials Science) 2005年第3期20卷 60-63页

作者：赵新奇 School of Materials Science and Engineering Tongji University Shanghai baosteel Research institute Shanghai 201900China

The microstructures of the nanocrystalline surface layer of a quenched and high temperature tempered 0. 4C- 1Cr steel induced by high-power surface processing （HPSP） technique were characterized by scan- ning eleetron microscopy and transmission electron microscopy. The results indicate that a nanocrystalline layer was fabricated on the surface of the steel 19 using HPSP treatment. The mean grain size in the surface layer is about 11 nm. The nanocrystallization of cementite is prior to that of the matrix phase, ferrite.

关键词： cementite high-power surface processing surface nanocrystallization

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Simulation-based multi-objective optimization for roll shifting strategy in hot strip mill

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Journal of Central South University 2013年第5期20卷 1226-1234页

作者：李维刚 College of Information Science and Engineering Northeastern University Automation Division Central Research InstituteBaosteel Group Corporation

A simulation-based multi-objective optimization approach for roll shifting strategy in hot strip mills was presented. Firstly, the effect of roll shifting strategy on wear contour was investigated by mtmerical simulation, and two evaluation indexes including edge smoothness and body smoothness of wear contours were introduced. Secondly, the edge smoothness average and body smoothness average of all the strips in a rolling campaign were selected as objective functions, and shifting control parameters as decision variables, the multi-objective method of MODE/D as the optimizer, and then a simulation-based multi-objective optimization model for roll shifting strategy was built. The experimental result shows that MODE/D can obtain a good Pareto-optimal front, which suggests a series of alternative solutions to roll shifting strategy. Moreover, the conflicting relationship between two objectives can also be found, which indicates another advantage of multi-objective optimization. Finally, industrial test confirms the feasibility of the multi-objective approach for roll shifting strategy, and it can improve strip profile and extend same width rolling miles of a rolling campaign from 35 km to 70 km.

关键词： hot rolling roll shifting strategy roll wear multi-objective optimization Pareto-optimal front

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