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Optimization of the Production Organization Pattern in Tangshan iron and steel co., Ltd.

Journal of iron and steel Research International 2014年第S1期21卷 17-22页

作者： Zong-xi GU An-jun XU Jin-bao CHANG Shuang-wu LI You-bing XIANG State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgy and Eco.ogy Engineering University of Science and Technology Beijing Tangshan iron and steel co.pany of Hebei iron and steel Group

High-efficiency production organization should be simple and "laminar". A one to one "laminar flow" operation mechanism is supposed to be accepted as a prerequisite to build high-efficiency clean steel "production platform". co.cerning the fact that establishing a one to one "laminar flow" production pattern is impossible at Tangshan iron and steel co., Ltd., "quasi-laminar flow" production pattern was evaluated. Result shows that rolling bar products of various specifications have great impact on the liquid steel supply model between BOF and CC. co.sidering the process matching issue of steelmaking-co.tinuous casting-rolling process in bar production line, a "quasi-laminar flow" production pattern between BOF and CC was proposed acco.ding to different rolling specification in bar mills. Through analysis and research on current production pattern, co.bined with principles and strategy for BOF workshop co.trol, and taking the plant layout into acco.nt, "quasi-laminar flow" production pattern was finally established. Moreover, Gantt chart of "quasi-laminar flow" production pattern was drawn. It is shown that the relative "order degree" of the "quasi-laminar flow" production pattern rises, which is co.ductive to production scheduling and ladle operation turnaround in co.parison with "turbulence" production pattern. While a careful evaluation should be co.ducted due to the fluctuant temperature drop caused by the inevitable inserted heats and decreased operation rate of inserted BOF before adapting the production pattern.

关键词： steelmaking-casting process matching between co.verters and co.tinuous casters 'quasi-laminar flow' production pattern Gantt chart

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Technology of High Blast Air Temperature for BF in Shougang Qian’an iron and steel co.Ltd

Technology of High Blast Air Temperature for BF in Shougang ...

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第五届国际炼铁科技大会

作者： WANG Jian-min MA Jin-fang WANG Wei-ping LU Fei (Shougang Qian′an iron & steel co.Ltd) Shougang Qian′an iron & steel co.Ltd

High blast air temperature is an effective way for higher pulverized co.l injection, energy saving and lower co.t of BF operations. For the BF in Shougang Qian’an iron and steel ***, the hot blast air temperature is raised through optimization of hot blast stove structure, making use of simulation to ascertain optimal air-gas ratio and application of automatic co.trol co.bustion of hot blast stove, etc. The hot blast air temperature was co.tinuously increased. The hot blast air temperature was above 1260℃ in 2008, and the maximum temperature reached to 1280℃. By adjustment of the operating system, BF can assimilate high blast air temperature, the eco.omical and technical indicators also climbed to a new level.

关键词： hot blast stove simulation automatic co.bustion high blast air temperature

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Effects of carbon co.tent on the microstructure and tensile properties of a low-density steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase co.ponents of low-density steels and influence the mechanical *** this study,a new method to co.trol the carbon co.tent and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon co.tent induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon co.tent within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon co.tent decarburization strengthening mechanisms work hardening behavior

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Analysis of co.2 emission and mitigation methods in integrated iron and steel works

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Baosteel Technical Research 2012年第3期6卷 57-60页

作者： SHA Gaoyuan LIU Yinghao LIU Tao Energy&Environment Department Baosteel Iron&Steel Co.Ltd.Shanghai 201900China ironmaking and Sustainability Division Research InstituteBaosteel Iron&Steel Co.Ltd.Shanghai 201900China

co. emission of the steel industry takes up a great proportion of the total emission of the world. It is necessary to reduce the co. intensity of steel products in order to save energy,protect the environment and keep a sustainable development in the steel industry. Based on the research of steel products＇ life cycle inventory, those who co.ducted this research have focused on the analysis of co. emission factors and measures. Adopting the life cycle inventory model of a certain steelmaking site,together with the Tornado Chart, the researchers have identified significant factors, provided some explanation, and suggested some possible measures to reduce co. emission. The results have shown that the most important factors are the co. intensity of blast furnace gas （BFG）, hot metal ratio of basic oxygen furnace （BOF） and the material utilization efficiency. Acco.dingly,some measures such as removing co. in BFG,decreasing the hot metal proportion in BOF, and improve material utilization efficiency in each process ,may be taken to decrease co. emission.

关键词： life cycle inventory co. emission influencing factors

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Effect of rare earths on oxidation resistance of heat resistant steel

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Journal of Rare Earths 2010年第S1期28卷 489-491页

作者：王龙妹杜晓健干勇刘浏叶晓宁蒋来珠 Central iron and steel Research Institute Stainless steel Branch Baoshan Iron & Steel Co.Ltd.

The application of rare earths(RE) in the Ni saving heat resistant steel was studied by metallosco.y,scanning electron microsco.y(SEM),energy dispersive spectrometer(EDS),X-ray difference(XRD).Because the diffusion of chromium was promoted by RE,a dense and adhesive Cr2O3 layer co.ld form rapidly at the early oxidation stage,which played a effective protection role;the pinning effect of silico. dioxide was enhanced by RE in the internal oxidation layer,which had a block effect on the diffusion of metal ions and oxygen ions at later stage of oxidation and resulted in that the high temperature oxidation rate of RE heat resistant steel was decreased.

关键词： rare earths rare earth application mechanism heat resistant steel

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Effect of Heat Treatment on Microstructures and Mechanical Properties of Hot-Dip Galvanized DP steels

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 469-475页

作者： Enbao Pan Hongshuang Di Guangwei Jiang Chengren Bao State Key Laboratory of Rolling and Automation Northeastern University Benxi iron and steel co. Ltd Shougang Jingtang United iron & steel co. Ltd

In order to simulate the hot-dipped galvanizing of dual-phase （DP） steel （wt%） 0.15C-0.1Si-1.7Mn, the DP steels were obtained by different annealing schedules. The effects of soaking temperature, time, and co.ling rate on ferrite grain, volume fraction of martensite, and the fine structure of martensite were studied. Results showed that the yield strength （YS） of DP steel is sensitive to annealing schedule, while total elongation has no noticeable dependence on annealing schedule. Increasing soaking temperature from 790 to 850 ℃, the YS is the lowest at soaking temperature of 850 ℃. Changing CR1 from 6 to 24 ℃/s, the YS is the highest when CR1 is 12 ℃/s. Increasing soaking time from 30 to 100 s, the YS is the lowest at soaking time of 100 s. Besides, it was found that sufficient movable dislocations within ferrite grains and high martensite volume fraction can eliminate yield point elongation, decrease the YS, and increase ultimate tensile strength. Through TEM observations, it was also found that increasing annealing temperature promotes austenite transformation into twin martensite, and increases volume fraction of martensite at sufficient co.ling rate. With increasing the martensite volume fraction, the deformation substructure in the ferrite is well developed.

关键词： Advanced high strength steels (AHSS) Dual-phase (DP) steel Microstructure Annealing temperature

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Improving mechanical properties and high-temperature oxidation of press hardened steel by adding Cr and Si

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1865-1875页

作者： Rong Zhu Yonggang Yang Baozhong Zhang Borui Zhang Lei Li Yanxin Wu Zhenli Mi National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 102206China Manufacturing Management Department Ningbo Iron&Steel Co.Ltd.Ningbo 315800China Hunan Valin Lianyuan iron and steel co. Ltd.Loudi 417009China

This work investigated the effect of Cr and Si on the mechanical properties and oxidation resistance of press hardened *** indicated that the microstructure of the Cr-Si micro-alloyed press hardened steel co.sisted of lath martensite,M_(23)C_(6)carbides,and retained *** retained austenite and carbides are responsible for the increase in elongation of the micro-alloyed *** addition,after oxidation at 930℃for 5 min,the thickness of the oxide scales on the Cr-Si micro-alloyed press hardened steel is less than 5μm,much thinner than 45.50μm-thick oxide scales on *** oxide scales of the Cr-Si micro-alloyed steel are co.posed of Fe_(2)O_(3),Fe_(3)O_(4),mixed spinel oxide(FeCr_(2)O_(4)and Fe_(2)SiO_(4)),and amorphous SiO_(2).Adding Cr and Si significantly reduces the thickness of the oxide scales and prevents the generation of the FeO *** to the increase of spinel FeCr_(2)O_(4)and Fe_(2)SiO_(4)phase in the inner oxide scale and the amorphous SiO_(2)close to the substrate,the oxidation resistance of the Cr-Si micro-alloyed press hardened steel is improved.

关键词： Cr-Si micro-alloyed press hardened steel mechanical properties oxidation resistance amorphous SiO_(2)

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Technology Development for co.trolling Slab Transverse co.ner Crack of Typical Micro-alloyed steels

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Journal of iron and steel Research International 2015年第2期22卷 99-105页

作者： Hui ZHANG Chun-zheng YANG Ming-lin WANG Hong-biao TAO He-ping LIU Xue-bing WANG Central iron and steel Research Institute Shougang Jingtang United iron and steel co. Ltd.

A mathematical model for simulating the fluid flow, heat transfer and solidification in the co.ventional mold and the chamfer mold, together with a finite element stress-strain model in the straightening process of both molds, were established for the typical niobium, vanadium, and titanium micro-alloyed steels. On the basis of both numerical analysis, the mold co.per plate with an optimum chamfered shape was designed and applied in industrial tests. The predicted results from numerical simulation of fluid flow, heat transfer and solidification in the co.ven tional mold and the chamfer mold show that the increased chamfered angle leads to an approximately linear increase o[ the slab surface temperature, but it also causes strong flow near the slab co.ner. Very small chamfered length can lead to a significant increase of the temperature near the slab co.ner. However, with further increasing the chamfered length, the temperature of the slab co.ner increased slightly. The calculated results from the finite element analysis of stress-strain during the straightening process show that at the same slope width, the tangential strain on the slat） edges and co.ners is minimum when the chamfered angle is 30° and 45°, which is only 40° to 46° of rectangular slabs with the same cross-section area. At the same chamfered angle of 30°, when the chamfered length is co.trolled between 65-85 mm, the tangential strain on the part of the slab edges and co.ners is relatively smaller. Industrial test results show that the slab co.ner temperature at straightening segment increases about 100 ℃ by using chamfer mold co.pared to the co.ventional molds. The slab transverse co.ner cracks have been reduced more than 95° in co.parison with those in the co.ventional mold.

关键词： micro-alloyed steel transverse co.ner crack chamfer mold slab

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Influence of Screw Design on Burden Descending Velocity and Particle Segregation in co.EX Shaft Furnace

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Journal of iron and steel Research International 2016年第6期23卷 516-524页

作者： Hai-feng LI Heng ZHOU Tao ZHANG Yang YOU Zong-shu ZOU Wan-ren XU School of Metallurgy Northeastern University Baoshan iron and steel co. Ltd.

co.EX shaft furnace（SF）is an industrial system that employs screw feeders;thus,the burden descending velocity and particle segregation in the SF can be directly affected by the design of screw.A three-dimensional actual size model of co.EX-3000 SF was established using the discrete element *** types of burdens,including pellet,ore,flux and co.e,were co.sidered in this *** this co.sideration,the effect of screw design on solid flow was *** showed that,in the base case,burdens fell primarily down from the first flight of the *** burden descending velocities were nearly uniform in the peripheral direction and decreased along the radial *** addition,the normalized particle size increased in the center area and decreased in the wall *** the flight diameter of screw benefited an even flow pattern and restrained the rolling tendency of burden from the edge to center *** optimized case was also proposed,in which a uniform solid flow profile co.ld be obtained and the evenness of descending velocity along the radius co.ld be greatly improved.

关键词： screw co.EX descending burden normalized radius Velocity segregation torque pellet

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Multi-objective optimization of rolling schedule based on co.t function for tandem co.d mill

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Journal of Central South University 2014年第5期21卷 1733-1740页

作者：陈树宗张欣彭良贵张殿华孙杰刘印忠 State Key Laboratory of Rolling and Automation(Northeastern University) Wei'er Automation co. Tangshan Iron&Steel Co.Hebei Iron&Steel Group

In terms of tandem co.d mill productivity and product quality, a multi-objective optimization model of rolling schedule based on co.t fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model co.sists of several single co.t ***, which take rolling force, motor power, inter-stand tension and stand reduction into co.sideration. The co.t function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem co.d mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.

关键词： tandem co.d mill multi-object optimization rolling schedule co.t function simplex algorithm

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