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Effect of Annealing Temperature on the Precipitation Behavior and Texture Evolution in a Warm-Rolled P-co.taining Interstitial-Free High Strength steel

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 395-400页

作者： Jiecen Zhang Yu Cao Guangwei Jiang Hongshuang Di State Key Laboratory of Rolling and Automation Northeastern University benxi iron and steel co. Ltd

By using transmission electron microsco.y and electron back-scattered diffraction, the effect of annealing temperature on the precipitation behavior and texture evolution in a warm-rolled interstitial-free high strength steel was studied. The results indicated that fine FeTiP co.ld precipitate at 650 ℃, and the number of those precipitates increased greatly with the increasing annealing temperature until 800 ℃. Furthermore, the nucleation of FeTiP was influenced by the precipitation of TiC and （Ti, Nb） C. The near absence of FeTiP and a large volume fraction of TiC and （Ti, Nb） C in matrix are envisaged to be primarily responsible for the sharp y-fiber texture. As the boundary pinning effect caused by FeTiP is weak and there are less interstitial C atoms in matrix. Thus, annealing at 800 ℃ leads to the highest intensity of y-fiber texture.

关键词： Interstitial-free high strength (IFHS) Annealing temperature Precipitate Texture

co.position and processing of direct-quench hot rolled steels with ultrahigh strength exceeding GPa

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Journal of iron and steel Research International 2021年第6期28卷 703-712页

作者： Qian Zhang Da Ren Zhi-pu Liu Chen-chong Wang Jian Huang Wei Xu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina benxi iron and steel Group co. Ltd.Benxi 117002LiaoningChina

The design of high-strength steel has long been discussed in the field of metal structural *** further increase the strength of co.mon high-strength steel and further decrease the co.t for production,three direct-quench hot rolled steels were designed and *** rolling and co.ling processes were set based on co.tinuous co.ling transformation *** addition,the effect of the co.ling temperature on the tensile properties was discussed to further guide the optimization of the *** was found that co.pared with granular bainite,lower bainite probably has more advantages for both the strength and low temperature impact toughness of direct-quench hot rolled *** a process of tailoring the morphology of bainite and co.trolling the grain boundary precipitation,the newly designed direct-quench hot rolled steels showed greatly improved strength and acceptable ductility/toughness co.pared with traditional quenched and tempered steels.

关键词： High-strength steel Direct-quench hot rolling Bainite morphology Precipitation Mechanical property

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

Development of 600MPa co.d Rolled Dual Phase steel for Automotive Application in BX steel

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Journal of iron and steel Research International 2011年第S1期18卷 987-989页

作者： GAO Hong-gang,CHEN Li-hong,LIU Ming-hui,YU Wen-tao,WANG Ya-fen (Technology Center of benxi iron and steel (Group) co.Ltd.benxi 117000,Liaoning,China) benxi iron & steel Grp co.Ltd Ctr Technol Benxi 117000 Liaoning Peoples R China

BX steel has developed 600MPa co.d rolled dual phase in order to adapt to the market *** paper introduces the design of chemical co.position,hot rolling,co.d rolling and annealing process of experimental *** finished product property meets the technical standard,the microstructure is typical dual phase,F+M(14-16%).This product has been produced co.mercially in BX steel,and has been approved by end users.

关键词： automotive application dual phase microstructure

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

Texture Evolution in Ferritic Rolled Ti-IF steel During co.d Rolling

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Journal of iron and steel Research International 2010年第1期17卷 44-48,58页

作者： ZHANG Peng GUO Yan-hui WANG Zhao-dong WANG Guo-dong LIU Xiang-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China benxi iron and steel (Group) co.Ltd Benxi 117000 Liaoning China

The texture evolution of ferritic hot rolled Ti-IF steel during co.d rolling was investigated in which the reduction was from 15% to 85 %. It was found that α fibre texture was monotonously intensified with the increase in the co.d rolling reduction, while y fibre texture changed in a different way. When the co.d rolling reduction was in the range of 15 % -- 35 % or 45 % -- 75 %, γ fibre texture was strengthened ; however, when the co.d rolling reduction was 35 %- 45 % or 75 %- 85%, the intensity of 7 fibre was reduced. The 7 fibre displayed a maximum intensity for the reduction of 75%, and the highest average plastic strain ratio was simultaneously obtained owing to the favorable recrystallization texture.

关键词： Ti-IF steel ferritic hot rolling co.d rolling texture average plastic strain ratio

Growth of solidified shell in bloom co.tinuous casting mold of hypo-peritectic steel based on a FeS tracer method

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Journal of iron and steel Research International 2020年第7期27卷 782-787页

作者： Da-peng Li Hua-zhang Wu Hai-feng Wang Hong Li State Key Laboratory of Advanced steel Processing and Products Central Iron and Steel Research InstituteBeijing 100081China benxi iron&steel Group co. Ltd.Benxi 117021LiaoningChina State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China

Solidification behavior in the mold region plays an important role in production efficiency and steel *** investigate shell growth within a mold,the sulfur prints of the entire shell thickness profile the meniscus to 100 mm below the mold were obtainedadding FeS tracer into molten steel during bloom co.tinuous casting of hypo-peritectic *** law of shell thickness evolution along mold height and circumference was *** results show that there are three weak regions of solidification,which are in the mold upper part,in the mold lower part,and just below mold exit,possibly resulting periodic fluctuation of air gap between the shell and the mold,the impingement of melt jets on the solidification front,and the decreasing co.ling intensity,*** solidification point along casting direction appears at approximately 35 mm below the ***,the solidified shell thickness in the inner side of the mold is a little larger than that in the outer side,and the former and the latter reach 25.5 and 24.3 mm at the mold exit,*** non-uniform shell growth in the inner side of the bloom is provided,while shell thicknesses in the narrow face and the outer side follow relatively regular *** of the mold,the thinnest shells on the transverse section exist in the regions of 60–90 mm and 40–70 mm the co.ners of the inner and outer sides,respectively,i.e.,the of-co.ners.

关键词： co.tinuous casting Mold Hypo-peritectic steel Solidified shell Sulfur print

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

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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

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