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Optimization of multi-process parameters in secondary cooling solidification process of S30432 continuous casting billet 认领 引用
1
作者 Zhi-qiang Li Ying-xuan Shan +2 位作者 Li Wu Hua Hou Yu-hong Zhao 《China Foundry》 SCIE EI CAS CSCD 2026年第3期407-420,共14页
The synergistic mechanism of multiple process parameters on the solidification structure of niobium containing austenitic stainless steel during continuous casting is complex,which seriously affects the quality of con... The synergistic mechanism of multiple process parameters on the solidification structure of niobium containing austenitic stainless steel during continuous casting is complex,which seriously affects the quality of continuous casting billets and seamless pipes.In order to optimize the quality of continuous casting billet,a finite element model of solidification and heat transfer in continuous casting process was established for the secondary cooling process of continuous casting billet.The control variable method was used to explore the influence of casting speed and superheat on the solidification process.At the same time,an orthogonal scheme was designed to study the coupling effect of multiple process parameters on the heat transfer and solidification state of continuous casting billets,and optimized process parameters were selected.The optimization results of process parameters were verified through production experiments,and it is found that the enrichment of coarse niobium compounds directly causes the initiation and propagation of inner wall cracks during the large deformation hot piercing of S30432 seamless tubes.Process parameter optimization,especially the synergistic effect of the decrease of superheat and increase of specific water flow promotes the grain refinement and expension of equiaxed crystal zone,thereby mitigating the segregation of Nb elements and improving the distribution of niobium compounds. 展开更多
关键词 continuous casting solidification process process parameter optimization niobium compounds crack
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Characterization of the formation of slag rims of mold powder during hypo-peritectic steel continuous casting based on full-sectional microstructures 认领 引用
2
作者 Zhiqiang Peng Zibing Hou +2 位作者 Shuxian Xu Ping Tang Guanghua Wen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第2期567-578,共12页
A full-sectional microstructure characterization method was developed to investigate the formation of coarse slag rims during the continuous casting of hypo-peritectic steel.The cross-sectional microstructural analysi... A full-sectional microstructure characterization method was developed to investigate the formation of coarse slag rims during the continuous casting of hypo-peritectic steel.The cross-sectional microstructural analysis of typical slag rims for two highly crystalline powders revealed that their formation was primarily driven by the solidification of the liquid slag.Distinct differences were observed in the microstructures of slag rims from the two powders.Powder A(characterized by a higher breaking temperature and viscosity)displayed alternating lamellar microstructures of coarse and fine phases,with the coarse phases composed of akermanite-gehlenite transition phases.In contrast,powder B(with a lower breaking temperature and viscosity)predominantly comprised regular akermanite-gehlenite crystals interspersed with a certain amount of glassy phases.Numerical simulations of a three-phase fluid flow coupled with heat transfer indicate that slag rim formation correlates with mold oscillation.Solidification of the liquid slag at the slag rim front predominantly occurs during the negative stroke of the mold oscillation.The average heating rate during the ascending stage of the mold reaches approximately 100 K·s−1,whereas the average cooling rate during the descending stage attains 400 K·s−1.This temperature variation leads to the formation of lamellar microstructures,whereas the ascending stage promotes the formation of coarse structures and thicker slag rims.Based on the powder properties,two distinct formation pathways exist for highly crystalline mold powders.For the powders with a higher breaking temperature,higher viscosity,and narrower solidification range(powder A),coarse microstructures and thicker slag rims were preferentially formed.For powders with lower breaking temperature and viscosity and wider solidification ranges(powder B),the liquid slag resisted rapid solidification,and the extended mushy zone allowed the partial liquid slag to persist at the slag rim front,promoting the formation of a thin slag rim.This study enhances the understanding of slag rim formation in highly crystalline mold powders and provides critical insights into the control of longitudinal surface cracks in hypo-peritectic steel. 展开更多
关键词 hypo-peritectic steel longitudinal surface crack continuous casting slag rim full-sectional microstructures mold powder
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Effect of ladle shroud immersion depth on unsteady three-phase flow in continuous casting tundish during ladle change-over process 认领 引用
3
作者 Yu-Chao Yao Zhong-Qiu Liu +3 位作者 Yu-Ze Wei Ning Wang Jun Yang Bao-Kuan Li 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期443-457,共15页
The transient phenomena of re-oxidation and slag entrapment occurring in the tundish during the ladle change-over process have been proven detrimental to clean steel production.Therefore,an unsteady three-phase turbul... The transient phenomena of re-oxidation and slag entrapment occurring in the tundish during the ladle change-over process have been proven detrimental to clean steel production.Therefore,an unsteady three-phase turbulence model,coupling velocity,temperature,and phase field was established to study the effect of the ladle shroud immersion depth on the slag eye formation,slag entrainment,slag dragging,air dragging,and flow characteristics during the ladle change-over process of a two-strand tundish.The results showed that reducing the immersion depth decreases the high-velocity region area under the slag layer in the quasi-steady process.During the emptying stage,as the molten bath level gradually decreases,the outlet temperature exhibits a trend of initially decreasing and subsequently increasing across all three shroud immersion depths.However,under a 210 mm shroud immersion depth,molten slag and air are dragged into the shroud,forming slag droplets and causing significant fluctuations,with a maximum scalar velocity of 0.0764 m/s at the monitoring point.In the filling stage,air and molten slag are dragged into the molten bath,forming bubbles and slag droplets at an immersion depth of 210 mm.Bubbles are observed within the molten slag layer,which can readily cause an emulsification phenomenon,making it easier to be dragged as slag droplets.Additionally,the slag eye area measured under 210 mm immersion depth at 45 s is 0.303 m2,while the maximum scalar velocity of 2.4259 m/s is detected at 12 s.At an immersion depth of 360 mm,the average area of the slag eye is minimized to 0.06268 m2,with corresponding variances of 0.006753,representing the optimal immersion depth. 展开更多
关键词 Continuous casting tundish Ladle change-over Ladle shroud Immersion depth Three-phase flow Unsteady state
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Quantitative correlation between solidification front steel speed and solidified shell surface temperature in a slab continuous casting mold 认领 引用
4
作者 Wen-Jie Rong Yan Jiang +3 位作者 Xin-Yi Li Zhong-Qiu Liu Bao-Kuan Li Cheng-Jun Liu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期29-42,共14页
The flow of molten steel at the solidification front in a continuous casting mold has a significant impact on slab quality.However,due to the high temperature and opacity of the mold,direct velocity measurements are e... The flow of molten steel at the solidification front in a continuous casting mold has a significant impact on slab quality.However,due to the high temperature and opacity of the mold,direct velocity measurements are extremely challenging.The functional relationship between flow speed at the solidification front and the temperature of the outer surface of the solidified shell is derived heat conduction equations.Subsequently,a coupled flow-heat transfer-solidification model for the mold is developed to numerically determine the flow speed and temperature distribution.Based on thermocouple installation positions and the impingement point location of the molten steel jet on the narrow face of the mold,33 sampling points are selected along both the narrow/wide face centerline and corresponding heights at the solidification front.Finally,the flow speed at the solidification front is fitted as a function of the outer surface temperature of solidified shell and the distance from the meniscus,with detailed analysis of its distribution characteristics. 展开更多
关键词 Continuous casting mold Solidification front steel velocity Solidified shell surface temperature Heat transfer Quantitative correlation
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Asymmetric flow in multi-mode continuous casting and rolling mold under electromagnetic braking 认领 引用
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作者 Jing-Pei Shi Xiao-Xian Shang +3 位作者 Xin-Yue Shi Zhan-Long Piao Cai-Jun Zhang Li-Guang Zhu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期159-179,共21页
The flow behavior of molten steel in the thin slab mold under high casting speed conditions was investigated,with a focus on the multi-mode continuous casting and rolling mold.A steel-slag two-phase flow model was est... The flow behavior of molten steel in the thin slab mold under high casting speed conditions was investigated,with a focus on the multi-mode continuous casting and rolling mold.A steel-slag two-phase flow model was established using large eddy simulation,the volume of fluid,and magnetohydrodynamics methods through numerical simulation.The maximum flow velocity and wave height at the steel-slag interface within the mold are critical evaluation criteria for analyzing asymmetric flow under varying casting speeds and electromagnetic braking.The results indicate that the asymmetric flows within the mold do not occur synchronously.The severity of the asymmetric flow correlates with the velocity difference across the steel-slag interface.A greater biased flow prolongs the time required to revert to a steady state.When the magnetic field intensity is set to 0.24 T and the magnetic pole position is at 390 mm from the steel-slag interface,this configuration can reduce the velocity of the steel-slag interface,thereby mitigating the asymmetric flow.Additionally,it can diminish the velocity,impact depth,and impact intensity on the narrow face of the jet,thus improving the distribution of velocity and turbulent kinetic energy within the mold.This configuration prolongs the time required for the steel-slag interface to transition from a stable state to its maximum velocity and shortens the time for the interface to return to stability from an unstable state.Moreover,it ensures the positional stability of the steel-slag interface,confining its position within−3 mm. 展开更多
关键词 Multi-mode continuous casting and rolling mold Asymmetric flow Steel-slag interface Turbulent kinetic energy Electromagnetic braking
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An unsupervised deep learning-based online anomaly detection model for mold level in continuous casting process 认领 引用
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作者 Meng-Ying Geng Zheng-Yi Li +3 位作者 Yu-Han Xu Shuang-Li Liu Yi-Bo Ai Wei-Dong Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期318-331,共14页
Maintaining constant mold level variations during the continuous casting process is essential to guarantee the effectiveness and quality of steel production. An unsupervised deep learning-based mold level anomaly dete... Maintaining constant mold level variations during the continuous casting process is essential to guarantee the effectiveness and quality of steel production. An unsupervised deep learning-based mold level anomaly detection (MLAD) model for real-time monitoring of mold level fluctuations under varying operating conditions was proposed. The MLAD framework employs a two-stage encoder-decoder structure with adversarial training to accurately reconstruct time-series mold level data. In the first stage, the model learns long-term trends by reconstructing input windows, while in the second stage, it employs reconstruction errors as focus scores to capture short-term anomaly patterns. A transformer-based architecture, incorporating multi-head attention mechanisms and positional encoding, enables MLAD to capture both local and global temporal dependencies. In addition, a novel multi-threshold strategy, based on extreme value theory, is implemented to enhance the model’s ability and to adapt to varying operating conditions, including startup, steady-state, and shutdown phases. The model was validated with over 240-h real data from a steel factory. The results demonstrate its superior performance in anomaly detection compared to popular methods, with a precision of 0.9937, recall of 0.9932, and a low false alarm rate of 0.0038. MLAD represents a significant advancement in the detection of nonlinear and nonstationary anomalies in industrial processes, offering an efficient solution for smart manufacturing systems. Therefore, the established model could be used for online anomaly detection of mold level with real-time data. 展开更多
关键词 Continuous casting Unsupervised learning Time series Anomaly detection Mold level abnormal fluctuation
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Inhibiting surface crack propagation of S32654 by feeding strip into continuous casting mold 认领 引用
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作者 Rui Zhang Hong-Chun Zhu +6 位作者 Hua-Bing Li Zhou-Hua Jiang Zhi-Yu He Zhuo-Wen Ni Yu-Jie Zheng Hao Feng Shu-Cai Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期341-354,共14页
A coupled numerical model integrating molten steel flow,solidification behavior,matrix deformation behavior,and surface crack tip extension was developed.Following validation of temperature evolution and strain-stress... A coupled numerical model integrating molten steel flow,solidification behavior,matrix deformation behavior,and surface crack tip extension was developed.Following validation of temperature evolution and strain-stress curve,the model was used to investigate slab crack propagation with various strip feeding ratios during continuous casting,accounting for variations in crack positions and types.The results show that the“double roll”flow is formed under the limitations of the mold narrow surface,meniscus,and submerged entry nozzle,inducing an easier propagation of crack at the slab narrow surface where the S32654 matrix exhibits higher temperature and lower yield strength.The feeding strip prevents the jet from washing on the slab narrow surface,significantly reducing the temperature and increasing the yield strength there.As the strip feeding ratio increases,crack propagation becomes more difficult,while surface crack area gradually decreases.Moreover,longitudinal crack propagation occurs most easily,followed by 45°oblique crack propagation,while transverse crack propagation is the most difficult,due to the increasing angle between the directions of stress release and slab casting.The optimal strip feeding ratio should be around 0.75%,stopping the propagation of transversal cracks and 45°oblique cracks,and avoiding adhesion between the solidified shell and the steel strip simultaneously. 展开更多
关键词 Feeding strip technology Slab continuous casting Numerical simulation Crack propagation Super austenitic stainless steel
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Application of machine learning models in continuous casting process 认领 引用
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作者 Yi Ji Jia-Xi Chen +7 位作者 Le-Jun Zhou Wan-Lin Wang Si-Bao Zeng Li-Wu Zhang Hong-Liang Lin Xiao-Kang Liu Jiang-Hua Qi Kui Chen 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期259-276,共18页
The continuous casting process plays a pivotal role in modern steel production,directly influencing product quality and economic benefits.In recent years,machine learning has been increasingly applied to address compl... The continuous casting process plays a pivotal role in modern steel production,directly influencing product quality and economic benefits.In recent years,machine learning has been increasingly applied to address complex and nonlinear metallurgical issues,enabling data-driven prediction,detection,and optimization.The latest progress in applying machine learning to continuous casting was systematically summarized,with a focus on three key areas:abnormal condition prediction,slab quality detection,and process optimization.For abnormal events such as sticking breakout,submerged entry nozzle clogging,and mold level fluctuation,machine learning models exhibit more accurate and adaptive prediction capabilities than traditional threshold-based methods.In defect detection,various defects can be captured by trained models based on computer vision and production process data.In terms of optimization,offline approaches leverage interpretability tools to visualize the decision-making behavior of the model using historical data,whereas online optimization enables real-time decisions and closed-loop control.Importantly,considering the specificity of metallurgical mechanisms,feature selection,model design,and result interpretation need to be guided by domain knowledge,thereby bridging the gap between theoretical algorithms and industrial applicability.This work aims to provide a comprehensive reference for designers,facilitating the development of more efficient and reliable machine learning solutions in the continuous casting process. 展开更多
关键词 Continuous casting Machine learning Abnormal condition prediction Slab quality detection Process optimization
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Rapid velocity magnitude flow field prediction in electromagnetically stirred continuous casting via a proper orthogonal decomposition-based reduced-order model 认领 引用
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作者 Qi Jia Zi-Wen Zhao +4 位作者 Chang Liu Zhu He Guang-Qiang Li Wen Yan Qiang Wang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期353-368,共16页
A reduced-order model(ROM)based on proper orthogonal decomposition(POD)is proposed,integrating POD methodology with regression techniques to predict velocity magnitude flow field morphology in continuous casting elect... A reduced-order model(ROM)based on proper orthogonal decomposition(POD)is proposed,integrating POD methodology with regression techniques to predict velocity magnitude flow field morphology in continuous casting electromagnetic stirring processes under varying operational parameters.Computational fluid dynamics(CFD)simulations were performed to calculate flow fields at various casting speeds and applied currents,resulting in a comprehensive sample database.The velocity matrix was decomposed via POD,and regression models were subsequently trained to correlate operational parameters with mode coefficients.Validation against CFD simulations proved the ROM’s effectiveness in predicting velocity magnitude flow fields under electromagnetic stirring,with maximum relative errors of 6.5%in the mold region and 8.4%in the turbulent stirring zone.Notably,the POD-based ROM achieved a computational efficiency three orders of magnitude higher than conventional CFD simulations(prediction time of about 1/1000 of CFD). 展开更多
关键词 Reduced-order model Proper orthogonal decomposition Electromagnetic stirring Slab continuous casting Velocity magnitude flow field prediction
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Microstructure,mechanical properties,and formability of 1030B Al strip manufactured by ultrasound-assisted continuous casting direct rolling 认领 引用 被引量：2
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作者 Li ZHANG Xiao-qian LI +4 位作者 Shang GE Guan HUANG Ri-peng JIANG Jing-pei XIE Shao-kang GUAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第5期1381-1393,共13页
The microstructure and properties of a 1030B Al strip were improved by applying ultrasonic melt treatment(UMT)in a Hazelett continuous casting direct rolling production line.The microstructure and properties of the 10... The microstructure and properties of a 1030B Al strip were improved by applying ultrasonic melt treatment(UMT)in a Hazelett continuous casting direct rolling production line.The microstructure and properties of the 1030B Al strip were investigated by scanning electron microscopy,electron backscatter diffraction,and tensile testing.Applying UMT reduced the average grain size of the as-cast sheet by more than 28.0%with respect to that of the normal samples without UMT.When UMT was applied,the rolled strip inherited the refined grains from the as-cast sheet with an average grain size smaller than 63.0μm.Meanwhile,the dislocation density was increased by the grain refinement,dynamic recovery,and recrystallization during rolling.Accordingly,the strain-hardening rates of the rolled samples after UMT were generally higher than those of the normal samples,and the strength of the rolled strip was also improved.Furthermore,the rolled strip exhibited better formability with higher strain-hardening exponents and Erichsen index values. 展开更多
关键词 grain refinement mechanical properties formability continuous casting direct rolling ultrasonic melt treatment 1030B Al
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Effect of Ti carbonitride on hot ductility of Ti microalloy steel during continuous casting 认领 引用 被引量：1
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作者 Tian-ci Chen Cheng Ji Miao-yong Zhu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第10期3355-3369,共15页
High temperature tensile were performed by using a thermo-mechanical GW1600 to simulate the deformation of Ti microalloy steels at high temperatures and low deformation rates similar to those during continuous casting... High temperature tensile were performed by using a thermo-mechanical GW1600 to simulate the deformation of Ti microalloy steels at high temperatures and low deformation rates similar to those during continuous casting.An equivalent austenite diameter was proposed,taking into account the weakening effects of proeutectoid ferrite films and Ti carbonitride precipitation.Based on this,a hot ductility prediction model for the slab was established to investigated hot ductility.The results show that as Ti content increases,the hot ductility of Ti microalloy steel initially increases and then decreases.At low Ti content,the pinning effect of Ti carbonitrides increases with the increase in Ti content,which inhibits grain coarsening for improving hot ductility.As Ti content increases,the size of carbonitrides grows,weakening the pinning effect and leading to austenite grain coarsening.Simultaneously,the formation of Ti carbonitrides inhibits proeutectoid ferrite film formation,leading to a reduction in its thickness.These combined factors reduce the hot ductility of the continuous casting steel.According to the hot ductility prediction model,in order of severity,the factors affecting hot ductility are:proeutectoid ferrite film,chain-like nanoscale Ti carbonitrides,austenite grain size,and dispersed nanoscale Ti carbonitrides.An accuracy error of less than 10%is shown by the model. 展开更多
关键词 Ti microalloy steel Ti carbonitride High temperature tension Hot ductility prediction Continuous casting
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Cracking tendency induced by precipitated phases in S32654 continuous casting slab 认领 引用
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作者 Hong-chun Zhu Rui Zhang +6 位作者 Hua-bing Li Yu-jie Zheng Zhou-hua Jiang Zhuo-wen Ni Zhi-yu He Hao Feng Shu-cai Zhang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第11期3847-3859,共13页
A mathematical model coupling flow,solidification,strain-stress,and interface failure was developed.Following identification of crack source type through thermal tensile experiment and validation by strain-stress comp... A mathematical model coupling flow,solidification,strain-stress,and interface failure was developed.Following identification of crack source type through thermal tensile experiment and validation by strain-stress comparison,the model was used to investigate slab cracking tendency near precipitated phases,considering various locations,sizes and shapes of them.The results show that the jet from submerged entry nozzle creates a“double roll”flow pattern during continuous casting,resulting in more uniform temperature distributions at slab corner and wide surface center compared with narrow surface center.Consequently,precipitated phases,particularly those located on the narrow surface,readily induce stress concentration and thus increase cracking tendency.A smaller precipitated phase size can reduce the stress concentration zone,while a more spherical shape can distribute surrounding stress along its surface and lower the internal stress within it,thereby decreasing the risk of slab cracking during continuous casting.The optimal precipitated phase exhibits a spherical or ellipsoidal shape with a major axis of less than 5µm,minimizing its potential to initiate cracks. 展开更多
关键词 Cracking tendency Solidification Slab continuous casting Numerical simulation Precipitated phase
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Soft reduction control investigation of spot segregation in continuous casting bloom for 42CrMoA crankshaft steel 认领 引用
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作者 Hai-jie Wang Ze Zhang +4 位作者 De-guo Fan Chuan-hui Jiang Bin-bin Zhang Pu Wang Jia-quan Zhang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第3期695-706,共12页
The crankshaft is subjected to complex rotational centrifugal force,periodic gas inertia force,and reciprocating inertia force during its working process.Consequently,the homogeneity requirement for crankshaft steel i... The crankshaft is subjected to complex rotational centrifugal force,periodic gas inertia force,and reciprocating inertia force during its working process.Consequently,the homogeneity requirement for crankshaft steel is exceptionally high.The distribution characteristics of center segregation and spot segregation of continuous casting bloom 42CrMoA crankshaft steel were analyzed by experiments,and the control mechanism of spot segregation by soft reduction zone and reduction amount was discussed.When the center solid fraction is between 0.61 and 1.00,an 8-mm soft reduction has a negligible impact on the flow of liquid steel at the end of solidification.Although it effectively improves center segregation,the improvement of spot segregation is limited.On the other hand,when the center solid fraction is between 0.31 and 1.00,a reduction of 10–12 mm,along with an expanded reduction zone and increased reduction amount,significantly promotes the flow of liquid steel at the end of solidification,reduces the size of equiaxed grains,mitigates the center negative segregation,and decreases the maximum size of spot segregation from 2954.29 to 1354.07μm.The number of spot segregations and the solutes enrichment degree of C,Cr,and Mn have also been significantly improved.An appropriate soft reduction zone and reduction amount can markedly ameliorate the semi-macro spot segregation of crankshaft steel blooms,thereby providing high-quality raw materials for subsequent products and enhancing the competitiveness of crankshaft products. 展开更多
关键词 Continuous casting Soft reduction Spot segregation Solute distribution Improvement mechanism
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Precipitation behavior and its effect on surface transverse cracks during continuous casting 认领 引用
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作者 Peng Lan Yi-fan Lu +2 位作者 Ying-chun Wang Li-rui Zhang Jia-quan Zhang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第3期519-535,共17页
Precipitation of carbides, nitrides, and carbonitrides is an important factor influencing the formation of surface transverse cracks in the continuous casting of microalloyed steel, affecting the quality and yield of ... Precipitation of carbides, nitrides, and carbonitrides is an important factor influencing the formation of surface transverse cracks in the continuous casting of microalloyed steel, affecting the quality and yield of the final product. Based on previous investigation, the precipitation sequence and temperature, position and mode, as well as the size, morphology, and number of different types of precipitates were reviewed. The effects of C, N, Nb, Ti, and V on the precipitation behavior and surface transverse cracks in continuous casting slabs were summarized, with a particular emphasis on the new achievements concerning Ti addition. The critical amounts of different elements to avoid serious surface cracks during continuous casting were proposed. The control mechanisms and industrial effects of composition optimization, cooling design, and chamfered mold configuration to improve surface transverse cracks in continuous casting slabs were also illustrated, and the recent application of surface microstructure control technology was emphasized. The characteristics, advantages, and shortcomings of existing theoretical and experimental methods in investigating continuous casting surface cracks regarding precipitation are finally discussed, and a new setup with advanced functions is introduced. 展开更多
关键词 Microalloyed steel Surface transverse crack Precipitation Hot ductility Continuous casting
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Electromagnetic swirling flow control in nozzle in slab continuous casting 认领 引用
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作者 Xiao-wei Zhu Xian-cun Liu +5 位作者 Li-jia Zhao De-wei Li Chen Tian Kai Wang Bai-gang Jin Qiang Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第4期935-949,共15页
The electromagnetic swirling flow in nozzle(EMSFN)technique is designed to mitigate the adverse effects of unstable and uneven flow within the submerged entry nozzle in continuous casting.Utilizing electromagnetic for... The electromagnetic swirling flow in nozzle(EMSFN)technique is designed to mitigate the adverse effects of unstable and uneven flow within the submerged entry nozzle in continuous casting.Utilizing electromagnetic forces,EMSFN stabilizes the flow within the nozzle,leading to a more controlled flow in the mold.Numerical simulations were used to quantitatively analyze the magnetic and flow fields in a slab continuous casting system under EMSFN.Results indicate that EMSFN significantly stabilizes the outflow from the nozzle,with stability increasing with higher current intensity.At 10,000 Ampere-turns(At)of the coil,meniscus fluctuations were unstable.They stabilized at 13,000 At,with minimal changes observed beyond this point.The optimal current intensity for stable mold flow,at a casting speed of 1.56 m/min,is 13,000 At.These findings confirm the effectiveness of EMSFN in stabilizing the internal flow field of the slab mold and determining optimal operational current intensity. 展开更多
关键词 Electromagnetic swirling flow Submerged entry nozzle Continuous casting Flow stabilization Meniscus fluctuation Impact depth Flow symmetry
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Optimizing cooling approach of spiral coil for an electromagnetic steel teeming system of ladle in continuous casting production 认领 引用
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作者 Ming He Qing-wei Wang +3 位作者 Li-jia Zhao Wang-zhong Mu Xing-an Liu Qiang Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第1期85-94,共10页
To address the current issues with the conventional slide gate system utilized in the steel teeming process,a unique electromagnetic induction controlled automated steel teeming(EICAST)technology has been developed.Co... To address the current issues with the conventional slide gate system utilized in the steel teeming process,a unique electromagnetic induction controlled automated steel teeming(EICAST)technology has been developed.Cooling means of spiral coil in this technology is directly related to its service life.Firstly,heat transfer processes of air cooling and spray cooling were compared and analyzed.Secondly,the impacts of water temperature,water flow rate and air flow rate were examined in order to maximize the spray cooling effect.To maintain coil temperature at a low value consistently throughout the entire thermal cycle process of the ladle,a combined cooling mode was finally employed.Numerical simulation was applied to examine the coil temperature variation with different cooling systems and characteristics.Before coil operation,spray cooling is said to be more effective.By controlling the water flow rate and air flow rate,the spray cooling effect is enhanced.However,water temperature has little or no impact when using spray cooling.Air cooling during the secondary refining process and spray cooling prior to coil operation are combined to further lower coil temperature.When the direction of the spray cooling is from bottom to top,the coil temperature is lowered below 165℃.A practical induction coil cooling plan was provided for the EICAST technology’s production process. 展开更多
关键词 Electromagnetic induction controlled automated steel teeming technology Spiral coil Spray cooling Heat transfer Continuous casting
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A kinetic model for austenite grain growth during continuous casting considering massive type peritectic transformation 认领 引用
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作者 Peng Lan Hua-song Liu Jia-quan Zhang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第4期920-934,共15页
The continuous growth behavior of austenite grain in 20Cr peritectic steel was analyzed by experiment and theoretical modeling.The peculiar casting experiment with different cooling rates was achieved by multigradient... The continuous growth behavior of austenite grain in 20Cr peritectic steel was analyzed by experiment and theoretical modeling.The peculiar casting experiment with different cooling rates was achieved by multigradient operation scheme,and different morphologies in austenite grain were observed at the target location.The increase in austenite grain size with increasing cooling rate was firstly revealed in steels.The anomalous grain growth theoretically results from the mechanism of peritectic transformation transiting from the diffusional to massive type,and the additional energy storage stimulates the grain boundary migration.A new kinetic model to predict the growth behavior of austenite grain during continuous cooling process was developed,and the energy storage induced by massive type peritectic transformation was novelly taken into account.The parameters in the model were fitted by multiphase field modeling and experimental results.The kinetic model was finally verified by austenite grain size in laboratory test as well as the trial data at different locations in continuously cast bloom.The coarsening behavior of austenite grain during continuous casting was predicted based on the simulated temperature history.It is found that the grain coarsening occurs generally in the mold zone at high temperature for 20Cr steel and then almost levels off in the following process.The austenite finish transformation temperature Tγand primary cooling intensity show great influence on the grain coarsening.As Tγdecreases by 1℃,the austenite grain size decreases by 4μm linearly.However,the variation of Tγagainst heat flux is in a nonlinear relationship,suggesting that low cooling rate is much more harmful for austenite grain coarsening in continuous casting. 展开更多
关键词 Austenite grain growth Continuous casting Massive type transformation Kinetic model Peritectic steel
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Melt flow, heat transfer and solidification in bloom continuous casting with combined vertical linear electromagnetic stirring and rotary electromagnetic stirring 认领 引用
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作者 Ze-peng Wang En-gang Wang Zhong-xin Zhai 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第4期950-960,共11页
An opposite combined vertical linear electromagnetic stirring(CV-LEMS)was proposed,which is applied in the final solidification zone of bloom continuous casting.The melt flow,heat transfer,and solidification under CV-... An opposite combined vertical linear electromagnetic stirring(CV-LEMS)was proposed,which is applied in the final solidification zone of bloom continuous casting.The melt flow,heat transfer,and solidification under CV-LEMS were investigated by establishing a three-dimensional numerical simulation model and a pilot continuous casting simulation experiment and compared with the conventional rotary electromagnetic stirring(REMS).The results show that a longitudinally symmetric linear magnetic field is formed in the liquid core of the bloom by applying CV-LEMS,which induces a strong longitudinal circulation flow both on the inner arc side and the outer arc side in the liquid core of the bloom.The height of the melt longitudinal effective mixing range under CV-LEMS reaches 0.9 m,which is greater than that of the REMS and makes up for the deficiency of REMS sensitivity to the position of the final solidification zone.CV-LEMS strongly promotes the mixing of upper melt with high temperature and the lower part melt with low temperature in the liquid core,improves the uniformity of melt temperature distribution and significantly increases the melt temperature near the solidification front,and the width of the liquid core increases by 4.2 mm at maximum.This shows that the appliction of CV-LEMS is more helpful to strengthen the feeding effect of the upper melt to the solidification shrinkage of the lower melt than the conventional REMS and inhibits the formation of porosity,shrinkage cavity and crack defects in the center of the bloom. 展开更多
关键词 Combined vertical linear electromagnetic stirring Final rotary electromagnetic stirring Longitudinal circulation flow Feeding ability Bloom continuous casting
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Numerical simulation of the deformation risk in thin slab continuous casting process with liquid core reduction 认领 引用 被引量：4
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作者 Zhida Zhang Jize Chen +3 位作者 Cheng Ji Yutang Ma Miaoyong Zhu Wenxue Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第5期1114-1127,共14页
The application of liquid core reduction(LCR)technology in thin slab continuous casting can refine the internal microstruc-tures of slabs and improve their production efficiency.To avoid crack risks caused by large de... The application of liquid core reduction(LCR)technology in thin slab continuous casting can refine the internal microstruc-tures of slabs and improve their production efficiency.To avoid crack risks caused by large deformation during the LCR process and to minimize the thickness of the slab in bending segments,the maximum theoretical reduction amount and the corresponding reduction scheme for the LCR process must be determined.With SPA-H weathering steel as a specific research steel grade,the distributions of tem-perature and deformation fields of a slab with the LCR process were analyzed using a three-dimensional thermal-mechanical finite ele-ment model.High-temperature tensile tests were designed to determine the critical strain of corner crack propagation and intermediate crack initiation with various strain rates and temperatures,and a prediction model of the critical strain for two typical cracks,combining the effects of strain rate and temperature,was proposed by incorporating the Zener-Hollomon parameter.The crack risks with different LCR schemes were calculated using the crack risk prediction model,and the maximum theoretical reduction amount for the SPA-H slab with a transverse section of 145 mm×1600 mm was 41.8 mm,with corresponding reduction amounts for Segment 0 to Segment 4 of 15.8,7.3,6.5,6.4,and 5.8 mm,respectively. 展开更多
关键词 thin slab continuous casting liquid core reduction three-dimensional thermal-mechanical critical strain crack risk maxim-um theoretical reduction amount
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Grain growth kinetics model of high-temperature ferrite and austenite in Ti microalloyed steel during continuous casting 认领 引用 被引量：3
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作者 Tianci Chen Cheng Ji +2 位作者 Jianhua Yang Yunguang Chi Miaoyong Zhu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第6期1390-1403,共14页
The microstructural characteristics of austenite in Ti microalloyed steel during continuous casting significantly influence thethermoplasticity,thereby affecting the quality of the slab.In this work,a prediction model... The microstructural characteristics of austenite in Ti microalloyed steel during continuous casting significantly influence thethermoplasticity,thereby affecting the quality of the slab.In this work,a prediction model for two-stage austenite growth under varyingcooling rates was established by incorporating the effect of second-phase pinning and high-temperature ferrite-austenite phase transform-ation and growth theory.The results indicate that with 0.02wt%Ti,the high-temperature ferrite growth exhibits typical parabolic growthcharacteristics.When the Ti content increases to 0.04wt%,the high-temperature ferrite grain boundary migration rate significantly slowsduring the initial solidification stage.The predicted austenite grain sizes for 0.02wt%Ti microalloyed steel at the center,quarter,and sur-face of the slab are 5592,3529,and 1524μm,respectively.For 0.04wt%Ti microalloyed steel,the austenite grain sizes are 4074,2942,and 1179μm at the same positions.The average error is within 5%.As the Ti content increases from 0.02wt% to 0.04wt%,the austenitegrain refinement at the center is most significant,with an average grain size reduction of 27.14%. 展开更多
关键词 Ti microalloyed steel slab continuous casting phase transfer Ti carbonitrides austenite growth kinetics
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