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Influence of submerged entry nozzle clogging on the behavior of molten steel in continuously cast slab molds 被引量:4
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作者 Huixiang Yu Guosen Zhu Xinhua Wang Jiongming Zhang Wanjun Wang 《Journal of University of Science and Technology Beijing》 CSCD 2005年第4期303-307,共5页
The influence of submerged entry nozzle clogging on the behavior of molten steel in continuously cast slab molds was studied using commercial code CFX4.3. The results indicate that clogging at the top part of the nozz... The influence of submerged entry nozzle clogging on the behavior of molten steel in continuously cast slab molds was studied using commercial code CFX4.3. The results indicate that clogging at the top part of the nozzle port not only increases the velocity of molten steel, but also enhances the wall shear stress, F number and heat flux. This clogging has the greatest effect on the behavior of molten steel. However, clogging at the top 1/3 of the nozzle only increases the velocity of molten steel and has little influence. Clogging at the bottom of the nozzle almost has no influence. 展开更多
关键词 CLOGGING submerged entry nozzle MOLD continuously cast slab numerical simulation
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Formation mechanism of internal cracks in continuously cast slab 被引量:4
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作者 GuosenZhu XinhuaWang HuixiangYu JiongmingZhang WanjunWang 《Journal of University of Science and Technology Beijing》 CSCD 2004年第5期398-402,共5页
In order to make clear the formation mechanism of centerline cracks incontinuously cast slabs, the form, distribution and other characteristics of the cracks wereanalyzed. The final solidification point, surface tempe... In order to make clear the formation mechanism of centerline cracks incontinuously cast slabs, the form, distribution and other characteristics of the cracks wereanalyzed. The final solidification point, surface temperature of the slabs and strain in solidifyingshell were investigated. The results were that: (1) Five relatively low temperature zones exist onslab surface below the three water spraying nozzles and near the two edges, respectively, whichcorresponds to the places of centerline cracks and triangle-zone cracks. (2) Centerline cracks andtriangle-zone cracks occur because of weak secondary cooling, uneven cooling along slab width, andlarge variation of roll gap. (3) After minimizing the variation of roll gap and applying the newsecondary cooling pattern, the occurring frequency of centerline and triangle-zone cracks minimizesto zero. 展开更多
关键词 internal crack continuously cast slab secondary cooling SOLIDIFICATION STRAIN
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Quality Control for Continuously Cast Slab of High Strength Weathering Steel Q450NQR1 被引量:3
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作者 CHEN Yong,PAN Hong,WU Guo-rong (Material Research Department of PanGang Group Research Institute Co.Ltd.,Chengdu 611731,Sichuan,China) 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第S1期557-562,共6页
In order to reduce the transverse corner cracks of high strength weathering steel Q450NQR1,the factors influencing transverse corner cracks on continuously cast slab,such as level fluctuation of molten steel in mold,m... In order to reduce the transverse corner cracks of high strength weathering steel Q450NQR1,the factors influencing transverse corner cracks on continuously cast slab,such as level fluctuation of molten steel in mold,mold taper,primary cooling,mold powder,secondary cooling,nitrogen content in steel,spray nozzle structure,processing parameters and equipment of CC,etc.,were analyzed.Based on this,a series of comprehensive countermeasures have been proposed.The operation shows by the use of key technologies,including stabilizing steel level,optimizing the mold taper,weakening the primary cooling and the secondary cooling,reforming the mold powder,and adjusting spray nozzle structure,the transverse corner cracks on continuously cast slab have been significantly reduced,and the edge cracks on hot rolled sheet have been eliminated due to the transverse corner cracks.The qualified slabs are delivered to produce weathering cold forming sectional steel,whose yield strength is greater than 450MPa. 展开更多
关键词 weathering steel cold forming sectional steel HSLA slab continuous casting processing parameters
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Morphology and Precipitation Kinetics of MnS in Low-Carbon Steel During Thin Slab Continuous Casting Process 被引量:11
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作者 YU Hao KANG Yong-lin +1 位作者 ZHAO Zheng-zhi SUN Hao 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2006年第5期30-36,共7页
The morphology of manganese sulfide formed during thin slab continuous casting process in low-carbon steel produced by compact strip production (CSP) technique was investigated. Using transmission electron microscop... The morphology of manganese sulfide formed during thin slab continuous casting process in low-carbon steel produced by compact strip production (CSP) technique was investigated. Using transmission electron microscopy analysis, it was seen that a majority of manganese sulfides precipitated at austenite grain boundaries, the morphologies of which were spherical or close to the spherical shape and the size of MnS precipitates ranged from 30 nm to 100 nm. A mathematical model of the manganese sulfide precipitation in this process was developed based on classical nucleation theory. Under the given conditions, the starting and finishing precipitation temperatures of MnS in the continuous casting thin slab of the studied low-carbon steel are 1 189 ℃ and 1 171 ℃, respectively, and the average diameter of MnS precipitates is about 48 nm within this precipitation temperature range. The influences of chemical components and thermo-mechanical processing conditions on the precipitation behavior of MnS in the same process were also discussed. 展开更多
关键词 MORPHOLOGY thin slab continuous casting precipitation kinetics compact strip production TEM
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Longitudinal crack on slab surface at straightening stage during continuous casting using finite element method 被引量:5
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作者 喻海良 刘相华 《Journal of Central South University》 SCIE EI CAS 2010年第2期235-238,共4页
Deformation behavior of slab at the straightening stage during continuous casting was simulated by the explicit dynamic finite element method,and the stress distribution along the width direction of the slab and its c... Deformation behavior of slab at the straightening stage during continuous casting was simulated by the explicit dynamic finite element method,and the stress distribution along the width direction of the slab and its change regularity at slab center during continuous casting were obtained.The influence of distribution and change of stress on the propagation of longitudinal cracks on slab surface was discussed.The results show that the tensional stress appears on slab surface at the inner arc side and the compressive stress appears on slab surface at the outer arc side at stages 6-8 in straightening zone during continuous casting.Longitudinal cracks generally appear on slab top surface and do not appear on slab bottom surface,which are also observed in industry. 展开更多
关键词 continuous casting slab STRAIGHTENING longitudinal crack finite element method
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INVESTIGATION ON HOT DUCTILITY AND STRENGTH OF CONTINUOUS CASTING SLAB FOR AH32 STEEL 被引量:2
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作者 G. Y. Li X.F. Li L.G. Ao 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2006年第1期75-78,共4页
By means of Gleeble-1500 testing machine, the simulation of continuous casting process forAH32 steel was carried out and hot ductility and strength were determined. The cracking sensitivity was studied under the diffe... By means of Gleeble-1500 testing machine, the simulation of continuous casting process forAH32 steel was carried out and hot ductility and strength were determined. The cracking sensitivity was studied under the different temperatures and strain rates. The Precipitations of AIN at different temperatures and the fractures of high-temperature tensile samples were observed by using TEM (transmission electron microscope) and SEM (scanning electron microscope). The factors affecting the brittle temperature zone were discussed. 展开更多
关键词 continuous casting slab brittle temperature zone tensile strength ductility SIMULATION
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Strain in solidifying shell of continuous casting slabs 被引量:3
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作者 Guosen Zhu, Xinhua Wang, Huixiang Yu, and Wanjun WangMetallurgical Engineering School, University of Science and Technology Beijing, Beijing 100083, China 《Journal of University of Science and Technology Beijing》 CSCD 2003年第6期26-29,共4页
Two-dimension unsteady heat transfer model was applied to obtain the surfacetemperature and the shell thickness of continuous casting slabs during the process ofsolidification. On the basis of which, the mathematical ... Two-dimension unsteady heat transfer model was applied to obtain the surfacetemperature and the shell thickness of continuous casting slabs during the process ofsolidification. On the basis of which, the mathematical model of strain at the interface of solidand liquid steel was set up. Through which, the strain in the solidifying shell under normal andabnormal operation conditions was gained. The results indicate that the strain is small under thenormal operation conditions and the internal crack never happens. However, when the variation of theroll gap is above 2 mm, the strain caused by which is greater than that caused by bulging.Furthermore, the total strain exceeds the critical one and the internal crack is the result. So itis of great importance to maintain the fine state of continuous casting machine to avoid theappearance of internal crack. 展开更多
关键词 internal crack STRAIN BULGING unbending continuous casting slab
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Effect of cooling structure on thermal behavior of copper plates of slab continuous casting mold 被引量:2
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作者 孟祥宁 朱苗勇 《Journal of Central South University》 SCIE EI CAS 2013年第2期318-325,共8页
A three-dimensional finite-element model of slab continuous casting mold was conducted to clarify the effect of cooling structure on thermal behavior of copper plates. The results show that temperature distribution of... A three-dimensional finite-element model of slab continuous casting mold was conducted to clarify the effect of cooling structure on thermal behavior of copper plates. The results show that temperature distribution of hot surface is mainly governed by cooling structure and heat-transfer conditions. For hot surface centricity, maximum surface temperature promotions are 30 ℃and 15 ℃ with thickness increments of copper plates of 5 mm and nickel layers of 1 ram, respectively. The surface temperature without nickel layers is depressed by 10 ℃ when the depth increment of water slots is 2 mm and that with nickel layers adjacent to and away from mold outlet is depressed by 7℃ and 5 ℃, respectively. The specific trend of temperature distribution of transverse sections of copper plates is nearly free of cooling structure, but temperature is changed and its law is similar to the corresponding surface temperature. 展开更多
关键词 slab continuous casting MOLD copper plate cooling structure thermal behavior finite element analysis
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Numerical Simulation of Fluid Flow and Heat Transfer in Funnel Shaped Mold of Thin Slab Continuous Caster 被引量:2
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作者 ZHU Miao-yong WANG Jun ZHANG Ying 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2005年第6期14-19,共6页
Thin slab casting is used widely in the world. The control of molten steel flow and solidification in the mold is difficult due to the high casting speed and complicated configuration of the mold. Numerical simulation... Thin slab casting is used widely in the world. The control of molten steel flow and solidification in the mold is difficult due to the high casting speed and complicated configuration of the mold. Numerical simulation was carried out to study the fluid flow and heat transfer in the funnel shaped mold. The influence of nozzle design, casting speed and nozzle submersion depth on the flow and temperature fields in the mold was investigated, and guidance for selecting configurations of submerged nozzle was obtained. 展开更多
关键词 thin slab continuous casting fluid flow heat transfer numerical simulation
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Flow and Temperature Fields in Slab Continuous Casting Molds 被引量:1
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作者 Yin Zhang Liguo Cao +2 位作者 Youduo He Shiqi Li Yishen Shen(Institute of Metallurgical Engineering, Baotou University of Iron & Steel Technology Baotou 014010, China)(Metallurgy School, University of Science and Technology Beijing, Beijing 100083, China) 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2000年第2期103-106,共4页
In order to develop super-board and super-thick slabs, the flow and temperatur fields were studied in slab continuous casting molds under different practical conditions, such as slab dimensions, with-drawing slab spee... In order to develop super-board and super-thick slabs, the flow and temperatur fields were studied in slab continuous casting molds under different practical conditions, such as slab dimensions, with-drawing slab speed, design of nozzles, and superheat tempera-ture. The results showed that it is preferred to incline nozzle bores downwards and the submerged depth of the nozzles is best kept be-tween 250-300 mm. In addition, the solidified shell is thicker at the wide face than that at the narrow face, while the thin points alongthe wide face ekist both in the center and in the some area toward each respective end. 展开更多
关键词 slab continuous casting mold flow field temperature field mathematical model
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Modeling of unsteadiness of fluid flows and level fluctuations in thin slab continuous casting moulds 被引量:1
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作者 ZHANG Huanxin WANG Lei LIU Baicheng 《Baosteel Technical Research》 CAS 2010年第3期49-52,共4页
Unsteady fluid flows and level fluctuations in a thin slab continuous casting mould have significant influence on product quality. In this study, the phenomena concerning transient flow features and free surface motio... Unsteady fluid flows and level fluctuations in a thin slab continuous casting mould have significant influence on product quality. In this study, the phenomena concerning transient flow features and free surface motions were analyzed by means of the large eddy simulation (LES) software with the smagorinsky SGS model--VisualCast (VCast) II, where the Simpler algorithm on a body-fitted mesh was used to resolve governing equations. A series of water analog experiments on the fluid flow and the surface wave in the moulds of thin slab continuous casting were also performed. The results of fluid regions, middle of vortex and level fluctuation from digital simulations were identical with the results of the water analog experiments. 展开更多
关键词 thin slab continuous casting mould flow level fluctuation mathematical simulation water analog experiment
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Study Segregation of Alloying Elements in Continuous Casting Slab with Valence Electron Structure
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作者 YahLIU ZhilinLIU +1 位作者 ChengweiZHANG YingguangZHU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第4期421-425,共5页
By calculating the electron structures of the phases that phosphor, sulfur and alloying elements dissolving inγ-Fe, the reason why alloying elements can bring centerline segregation in continuous casting slab (CCS) w... By calculating the electron structures of the phases that phosphor, sulfur and alloying elements dissolving inγ-Fe, the reason why alloying elements can bring centerline segregation in continuous casting slab (CCS) with nA, the number of electrons on the strongest covalent bonds, and the structure formation factor S were investigated, and an electron structural criterion to control and to eliminate the centerline segregation was advanced. Basing on this, the electron structures of a part of rare earth phosphides and sulfides are calculated, the physical mechanism that rare earth elements can control the segregation of phosphor and sulfur is analyzed, and the criterion is well verified. 展开更多
关键词 Valence electron structure Continuous casting slab Centerline segregation Rare-earth elements.
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Research on the trajectory of non-metal inclusions with the flow in the mold during the solidification of continuous casting slabs
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作者 LIU Xufeng ZHENG Hongguang WANG Yan 《Baosteel Technical Research》 CAS 2011年第1期51-55,共5页
By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the sim... By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the simulation results, the main zones for inclusion particles accumulation were found and many factors that affected floating-up probability of inclusion particles were identified. These factors include the inclusion particle size, the casting speed and the slab width, etc. It is believed that the inclusion particle size is the key one among these factors. 展开更多
关键词 stainless steel continuous casting slab INCLUSION flow field numerical simulation
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Technological Investigation on the Continuous Casting of Mid-Width Thin Slabs
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作者 AN Yong ZHAMG Bai Ting +1 位作者 ZHANG Hui NI Man Sen and JI Xiu Qin 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 1994年第1期13-18,共6页
Continuous casting of thin slabs is a key state project for 7th and sth five -year plans. On thebasis of foundamental works , CISRI condueted the tests of 102 heats in Lanzhou Steel Works in the periodof January 1991-... Continuous casting of thin slabs is a key state project for 7th and sth five -year plans. On thebasis of foundamental works , CISRI condueted the tests of 102 heats in Lanzhou Steel Works in the periodof January 1991- June 1992. Three slab assortments of 50× 900 mm . 70 × 900 mm , 70 × 500 mm were ex-amined. In June of 1992, 412 t steel of 46 heats were cast with the efficiency of 91. 3 %. This. result meetsthe requiremeni of the state in this period. The mould, hedt transfer . casting technology and factors influ-encing slab’s qualities are investigated as well. 展开更多
关键词 niould continuous casting of thin slab technological properties
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The optimization of mold fluxes used for casting the peritectic steel of heavy slabs at Baosteel
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作者 WANG Hongbing ZHI Jianjun +2 位作者 TANG Ping BA Juntao WEN Guanghua 《Baosteel Technical Research》 CAS 2009年第1期46-50,共5页
In order to solve the problem of the high surface longitudinal crack ratio of heavy peritectic steel slabs produced by the No. 3 continuous caster at Baosteel,the physical properties of the original mold flux and the ... In order to solve the problem of the high surface longitudinal crack ratio of heavy peritectic steel slabs produced by the No. 3 continuous caster at Baosteel,the physical properties of the original mold flux and the optimized mold flux were compared in a comprehensive way by using analytical measures, such as a slag film heat-flow simulator, a thermowire molten flux crystallization tester and an X-ray diffractometer in the laboratory. The results reveal that one of the major reasons for the cracks is the poor heat transfer ability of the original mold flux. However, the optimized mold flux with a high basicity features a high crystallizing rate,low crystallization temperature and low heat-flow density. Therefore, the optimized mold flux is more suitable for casting peritectic steel by the heavy slab continuous caster. The test results show that the slabs produced by using the optimized mold flux had no surface longitudinal crack in four test casts, while the surface longitudinal crack ratio of the slabs produced by using the original mold flux was 5%. The optimized mold flux can effectively prevent slab surface longitudinal cracks from occurring. 展开更多
关键词 continuous casting of heavy slab peritectic steel mold flux surface longitudinal crack HEAT-FLOW slag film
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Modeling and control of dynamic soft reduction in continuous slab casting
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作者 GUO Liangliang~(1)),SHEN Houfa~(2)) and YAO Man~(3)) 1) Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 200940,China 2) Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China 3) School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China 《Baosteel Technical Research》 CAS 2010年第S1期27-,共1页
The centerline segregation in continuous casting steel is known to be formed by the interdendritic enriched liquid flow at the solidification end in strand.At present,several methods,such as thermal soft reduction, el... The centerline segregation in continuous casting steel is known to be formed by the interdendritic enriched liquid flow at the solidification end in strand.At present,several methods,such as thermal soft reduction, electromagnetic stirring and dynamic soft reduction,are available to reduce the center segregation and to improve the internal quality.Although some methods could alleviate center segregation to some extent,they can also give rise to new problems.For instance,thermal soft reduction can lead to surface cracking during casting of some steels and electromagnetic stirring can result in white band.Dynamic soft reduction is an effective technology for the improvement of strand quality in continuous slab casting.In this paper,the key parameters of dynamic soft reduction technology,such as soft reduction region,the total reduction amount,for low carbon steel have been studied based on experimental and theoretical analysis.The soft reduction region was related to the segregation of chemical composition,slab bulging of narrow side and avoiding internal crack of slab.The total reduction amount was composed of natural thermal shrinkage and actual reduction amount depending on critical strain.For low carbon steel with slab dimension of(950 - 1 950) mm×170 mm,the solid fraction range in soft reduction region was recommended from 0.4 to 0.8,the total reduction amount was 2.0 -2.8 mm,and the optimized reduction rate was 0.4 - 1.2 mm/min,respectively.Furthermore,a dynamic soft reduction system in continuous slab casting, Visual Cast-Dynamic,has been developed by multithreading method.It demonstrated that the dynamic soft reduction model in this study was correct with the ability of online control. 展开更多
关键词 continuous slab casting dynamic soft reduction soft reduction region total reduction amount
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Simulation of thermal behavior during peritectic steel solidification in slab continuous casting mold
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作者 ZHU Miaoyong and CAI Zhaozhen School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China 《Baosteel Technical Research》 CAS 2010年第S1期26-,共1页
Thermal behavior of the solidifying shell in continuous casting mold is very important to final steel products.In the present work,one two-dimension transient thermal-mechanical finite element model was developed to s... Thermal behavior of the solidifying shell in continuous casting mold is very important to final steel products.In the present work,one two-dimension transient thermal-mechanical finite element model was developed to simulate the thermal behavior of peritectic steel solidifying in slab continuous casting mold by using the sequential coupling method.In this model,the steel physical properties at high temperature was gotten from the micro-segregation model withδ/γtransformation in mushy zone,and the heat flux was obtained according to the displacement between the surface of solidifying shell and the hot face of mold as solidification contraction,the liquid-solid structure and distribution of mold flux,and the temperature distribution of slab surface and mold hot face,in addition,the rate-dependent elastic-viscoplastic constitutive equation was applied to account for the evolution of shell stress in the mold.With this model,the variation characteristics of surface temperature,heat flux, and growth of the solidifying shell corner,as well as the thickness distribution of the liquid flux,solidified flux,air gap and the corresponding thermal resistance were described. 展开更多
关键词 slab continuous casting MOLD peritectic steel thermal behavior
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Numerical simulation of fluid flows in a slab continuous casting mold under electromagnetic stirring
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作者 JIN Xiaoli ZHOU Yueming LEI Zuosheng 《Baosteel Technical Research》 CAS 2016年第1期10-15,共6页
This study established a three-dimensional mathematical model to determine the fluid flow in a slab continuous casting mold under an electromagnetic stirring force. The flow structure and distribution were studied wit... This study established a three-dimensional mathematical model to determine the fluid flow in a slab continuous casting mold under an electromagnetic stirring force. The flow structure and distribution were studied with respect to different continuous casting parameters and stirring current. Based on the calculation results, the mold flux entrapment index in free surface and velocity uniformity index were used to evaluate the flow field in the mold. The theoretical basis for the optimization of the flow field structure was provided. The study also suggested an optimization method for electromagnetic stirring parameters. 展开更多
关键词 slab continuous casting fluid flow electromagnetic stirring continuous casting parameter optimization
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Physical modeling and numerical simulation of electromagnetic stirring in a slab continuous casting mold
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作者 LI Bin LEI Zuosheng +6 位作者 GE Jiangmeng ZHONG Yunbo REN Zhongming ZHOU Yueming WU Cunyou JIN Xiaoli WEI Rujun 《Baosteel Technical Research》 CAS 2016年第1期3-9,共7页
Through physical modeling and numerical simulation,the flow field in a slab continuous casting mold with electromagnetic stirring is measured under different casting parameters and stirring currents. To qualitatively ... Through physical modeling and numerical simulation,the flow field in a slab continuous casting mold with electromagnetic stirring is measured under different casting parameters and stirring currents. To qualitatively evaluate the flow field in the mold, two indexes,i, e., mold flux entrapment and velocity uniformity, are proposed. Based on these two indexes, some optimized stirring parameters under different casting conditions can be determined. 展开更多
关键词 slab continuous casting mold electromagnetic stirring optimized parameters
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Effects of electromagnetic stirring on surface purity of IF steel slabs
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作者 ZHI Jianjun RUAN Xiaoming +1 位作者 ZHANG Jiongming HU Zhaofan 《Baosteel Technical Research》 CAS 2011年第4期36-39,共4页
In order to analyze the effect of electromagnetic stirring on the slab' s surface purity, the continuously cast slab surface inclusions and subsurface blisters have been investigated. The results indicate that the mo... In order to analyze the effect of electromagnetic stirring on the slab' s surface purity, the continuously cast slab surface inclusions and subsurface blisters have been investigated. The results indicate that the mold electromagnetic stirrer (M -EMS) is useful for the improvement of IF steel slabs' surface quality. The continuously cast slab surface inclusions and subsurface blisters have been significantly reduced. The distribution of bubbles in the slab is non-homogeneous in terms of both width and depth. The continuously cast slab surface inclusions tend to miniaturization through M-EMS and most of the inclusions are less than 10 μm in size. 展开更多
关键词 IF steel continuously cast slab EMS subsurface blisters non-metallic inclusions
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