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A New Route for Identification of Precipitates on Austenite Grain Boundary in an Nb-V-Ti Microalloyed steel

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Journal of Iron and steel Research International 2011年第8期18卷 53-57页

作者： SHA Qing-yun HUANG Guo-jian GUAN Ju MA Xiao-jun LI Da-hang technology Center Angang Steel Company Limited Anshan 114009 Liaoning China

The precipitates on austenite grain boundaries in an Nb-V-Ti microalloyed steel have been investigated by transmission electron microscope （TEM） examination of carbon extraction replica. The replica was prepared from specimen etched with saturated picric solution rather than Nital which is conventionally used. Then particles on both grain boundaries and triple point of grain [aoundaries were clearly observed and identified as （Nb,Ti）（C, N） parti- cles. In case of conventional way, it is difficult to determine the location of particles with respect to austenite grain boundaries. The number of particles observed in new way developed was greatly reduced compared with that found in replica prepared by the conventional way, which may be caused by the dissolution of partial precipitates during the etching with longer time and at higher temperature involved in new way. Despite this, the new way developed pro- vides an effective way to determine the precipitate particles on austenite urain boundaries_

关键词： precipitate austenite grain boundary replica etch

Individual Grain Orientation and Heterogeneous Deformation in Cold-deformed Interstitial-Free Sheet steel

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Journal of Materials Science & technology 2007年第5期23卷 689-692页

作者： Yandong LIU Chungang WANG Qiwu JIANG Tong HE Liang ZUO School of Materials and Metallurgy Northeastern University Shenyang 110004 China Production Manufacture Department Angang Steel Company Limited Anshan 114001 China Factory of Cold Rolling Silicon steel Angang Steel Company Limited Anshan 114001 China

The cold rolling deformation textural evolution of an interstitial-free （IF） steel sheet is investigated by experiment and simulation. The microstructure of the IF steel is observed by transmission electron microscopy （TEM）. The relationship between the deformation behavior of individual grain and the grain orientation are connected by Taylor factor M. The results show that the grains with higher Taylor factor are deformed slighter than those with lower ones. By considering the heterogeneous deformation, the texture simulation result can be greatly improved.

关键词： IF steel Texture Heterogeneous deformation Taylor factor

Texture Evolution of Columnar Grains in Electrical steel During Hot Rolling

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Journal of Iron and steel Research International 2013年第10期20卷 99-106页

作者： SHAO Yuan-yuan YANG Ping FU Yong-jun MAO Wei-min School of Materials Science and Engineering University of Science and Technology Beijing Cold Rolling Silicon steel Division Angang Steel Company Limited

Columnar grains in cast slabs of electrical steel show strong anisotropy in grain orientation and morphology and thus influence the subsequent microstructure and texture after hot rolling significantly. The texture evolution of hot rolled sheets containing initial columnar grains with their 〈100〉 directions approximately parallel to the rolling direction （RD）, transverse direction （TD） and normal direction （ND） of the hot rolled sheets was investigated by using EBSD technique. The results indicated that, whatever the initial texture of the columnar grains was, typical Goss, brass-type and copper-type shear texture component could develop in shear-deformed surface region. The copper-type texture formed under the maximum shearing force with the fine, sheared or dynamically recrystallized grains, and Goss grains were mainly elongated and deformed grains, while brass grains behaved between them. Ad- ditionally, the rotating relationship of the three types of shear textures was different due to the restriction of grain boundaries. In homogenously deformed center region, the RD sample contained more {112}〈110^-〉 grains, and TD sample was covered by {100} textures such as {100}〈011〉 and {100}〈021〉 with coarse grains, while the ND sample developed many {100}〈001〉 grains which were attributed to more {100} grains in the initial sample. Re- markable texture transition occurred on both sides of grain boundaries when {110} grains were adjacent to mfiber texture grains. It was found that significant texture gradient and preferred distribution of rotating axis existed in the soft orientation grains on the α- fiber when the grains neighbored hard grains on γ-fiber.

关键词： electrical steel columnar grain hot rolling texture orientation

Cooling Water Flow Rate Calculation for Hearth of Large Blast Furnaces

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China's Refractories 2015年第2期24卷 16-20页

作者： LI Hengxu CHE Yiunan ZHOU Zhe WANG Qi WANG Hongtao angang steel company limited

The cooling water flow rate for hearth of large blast furnaces was calculated by simulation. The results show that the cooling water flow rate shall be above 4 200m3/ h for hearth of large blast furnaces; to meet requirements of the increasing smelting intensity and to ensure the safety at the end of the first campaign,the designed maximum cooling water flow rate should be 5 900m3/ h; according to the flow distribution stability and the calculated resistance loss,hearth cooling stave pipes with the specification of 76 mm × 6 mm shall be adopted to assure the flow velocity in pipes of hearth cooling stave in the range of 1. 9- 2. 3 m / s.

关键词： hearth of blast furnaces cooling water flow rate simulation calculation

Distribution and segregation of dissolved elements in pipeline slab

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Journal of University of Science and technology Beijing 2007年第3期14卷 212-218页

作者： Jianhua Liu Yanping Bao Xian Dong Taiquan Li Yi Ren Shuai Zhang Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijng 100083 China technology Center of ANSC Angang Steel Company Limited Anshan 114001 China

The chemical composition in a cross section of a high grade pipeline slab was measured point by point （in a scale of 1 μm） using original position statistic distribution analysis （OPA）. The result indicated that negative segregation strips of Si, Mn, Mo, Ni, Cr, Nb, Cu, Ti, and V exist in the two sides 24 mm away from the central line, with a width of 8-12 mm, Negative segregation inside the central line is more severe than that outside the central line, and the highest positive segregation of the elements appears closely by the inner sides of the negative segregation strips. No obvious negative segregation strip of S and P is found. Segregation of the elements in the central area is higher than that in the outer and inner arc areas. The segregation of C, Ti, S, and P is high and that of Cr, Cu, Si, and Mn is low in the slab.

关键词： original position statistic distribution analysis (OPA) segregation negative segregation pipeline

Molten steel Breakout Prediction Based on Thermal Friction Measurement

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Journal of Iron and steel Research International 2011年第4期18卷 24-29,35页

作者： QIN Xu ZHU Chao-fu ZHENG Li-wen YIN Yan-rong School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China angang steel company limited Anshan 114021 Liaoning China

By measuring the pressure and piston stroke of hydraulic servo cylinders in the oscillation system of a caster mould,friction between mould and shell can be *** condition of solidified shell can be monitored by thermocouples fixed to the ***,whether caused by shell cracking,shell sticking or entrained impurities,can therefore be predicted and effectively avoided through monitoring the change characteristics of friction and thermocouples temperature during the process.

关键词： thermal friction measurement molten steel breakout prediction technology

Reaction dynamics in the combustion synthesis system of Al-CrO_3-Al_2O_3-NaF-N_2-O_2

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Journal of University of Science and technology Beijing 2007年第3期14卷 261-265页

作者： Dazheng Yang Yue Zhang Degang Li Dianwei Qi Wei Deng Dayong Xun angang steel company limited Anshan 114001 China State Key Lab for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

A new material with heat-resistant and adiabatic characteristics and high strength was prepared using the combustion synthesis method by mixed powders of CrO3, Al, Al2O3, and NaF in atmospheric gas. The reaction dynamic process of the Al-CrO3-NaF-Al2O3-N2-O2 new material system by the combustion synthesis method was discussed based on the observation results by SEM, EDS, and XRD in combination with the combustion front quenching method （CFQM） and the relation curves between reaction free enthalpies and the corresponding temperatures. The combustion synthesis mechanism and the formation reasons of the phase in the combustion product were analyzed.

关键词： combustion front quenching method (CFQM) reaction process combustion synthesis (CS) adiabatic materials

Speed Optimization technology of Process Control in Pickling Line and Tandem Cold Mill

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Speed Optimization Technology of Process Control in Pickling...

Mathematical Model of Hearth and Bottom Erosion in Blast Furnace

第25届中国控制与决策会议

作者： ZHU xiao-yan ZHANG Dian-hua PENG liang-gui WANG kui-yue SONG jun The State Key Laboratory of Rolling and Automation Northeastern University technology Center of angang steel company limited

ISBN: (纸本)9781467355339

The speed optimization （SO） control technology used in the pickling line and tandem cold mill （PL-TCM） is introduced. Based on characteristics of the speed control at each section of the PL-TCM, its optimal speed control was ascertained according to the speed control principle and SO strategy. With the loop capacity control principle and stability strategy, the line’s speed was controlled smoothly, which is helpful for improving strip’s quality and quickening the production rhythm. The production results indicate that the output of cold strip has been increased and its shape quality has been greatly improved with the SO control technology.

关键词： Speed optimization pickling line and tandem cold mill looper control cold rolled sheet

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China's Refractories 2014年第3期23卷 19-26页

作者： LI Hengxu CHE Yuman ZHOU Zhe WANG Qi WANG Hongtao angang Sleel company limited

Furnace lining erosion is closely related to the operation stability and safety. The detection technology for hearth lining thickness of blast furnace was *** using the data of thermocouples installed in the bottom of furnace hearth,a mathematical model of erosion was established; the real state of the hearth and bottom erosion was studied; the erosion condition was followed,serving for the furnace longevity.

关键词： blast furnace hearth erosion mathemat-ical model