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Mathematical modeling of flow field in slab continuous casting mold considering mold powder and solidified shell with high temperature quantitative measurement

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Journal of Iron and Steel Research International 2022年第3期29卷 445-461页

作者： Yi-bo Liu Jian Yang Chao Ma Tao Zhang Fu-bin Gao Tai-quan Li Jun-li Chen State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai200444China Technology Center HBIS Handan Iron and Steel Group Co.Ltd.Handan56015HebeiChina

Optimization of mathematical model of flow field in slab continuous casting mold was performed by means of industrial measurement and mathematical *** rod deflection method was used to quantitatively measure the velocities near the mold surface at high *** measurement results were compared with the simulation results of three mathematical models at different argon gas flow rates of 6,10 and 14 L min^(−1).The model 1 neglects the mold powder layer,thermal effect and solidified *** model 2 only considers the influence of mold powder *** model 3 considers the influence of mold powder layer,thermal effect and solidified shell on the flow *** all three models,the diameter of argon bubbles obeys Rosin-Rammler distribution fitted according to the experimental data of others’previous *** increasing the argon gas flow rate,the velocity of liquid steel near the mold surface *** model 1 seriously underestimates the shear stress of liquid steel near the mold surface,and its calculation results show higher velocity near the mold surface,lower turbulent kinetic energy and wider distribution of argon gas bubbles in the *** simulation results of model 2 only considering the viscous resistance of the mold powder layer to liquid steel makes the velocity near the surface lower than the measurement results *** calculated velocities near the mold surface with model 3 are in best agreement with the measured results,showing the reasonable spatial distribution range of argon bubbles in the mold and the moderate turbulent kinetic *** the present conditions,the best argon gas flow rate is 10 L min^(−1) due to the moderate velocity near the mold surface,the appropriate distribution of argon gas bubbles in the mold and the smallest fluctuation amplitude on the mold surface.

关键词： Flow field Mold powder layer solidified shell Rosin-Rammler distribution Mathematical modeling Rod deflection method

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Growth of solidified shell in bloom continuous 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 Ecological 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 continuous 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 cooling 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 corners of the inner and outer sides,respectively,i.e.,the of-corners.

关键词： Continuous casting Mold Hypo-peritectic steel solidified shell Sulfur print

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Numerical Simulation on Inclusion and Bubble Entrapment in solidified shell in Model Experiment and in Mold of Continuous Caster With DC Magnetic Field

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Journal of Iron and Steel Research International 2012年第S2期19卷 853-857页

作者： Yuji Miki Hiroyuki Ohno Yasuo Kishimoto Kohei Furumai Shinya Tanaka Steel Research Labs JFE Steel Corp JFE Systems Corp

A model experiment investigating entrapment of inclusions and bubbles on the solidified shell was performed using molten steel,and the conditions for inclusion and bubble entrapment and mechanism of entrapment were studied. The results were applied to the flow behavior in the casting mold of a continuous *** the solid-liquid interface, entrapment of inclusions is greatly reduced by the existence of a low velocity flow,e.g.,0.05m/*** above-mentioned interfacial flow velocity dependency of inclusion entrapment is considered to be largely influenced by changes in the thickness of the concentration boundary layer,which depend on the interfacial flow ***,bubbles and inclusions which enter the concentration boundary layer are drawn to the solid-liquid interface by a suction force which is several orders larger than the Saffman's *** addition to the above-mentioned suction force,the so-called cleaning effect is determined by fluid-dynamic forces such as drag force,*** act on particles,and furthermore,by resident time of particles at the solid-liquid interface,which depends on the solidification *** a FC mold with a 2-stage electromagnetic brake,flotation of bubbles entrained in the jet flow from the nozzle is accelerated with the large DC magnetic *** is attributed to the braking effect of the DC field on the nozzle jet and the upward flow by the buoyancy of the *** a result,the interfacial flow velocity can be normalized by increasing the strength of the magnetic field,and entrapment of large bubbles and inclusions can be reduced.

关键词： continuous casting mold molten steel numerical simulation flow solidified shell surface defect inclusion bubble entrapment interfacial tension electromagnetic field

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Numerical simulation of EMS position on flow, solidification and inclusion capture in slab continuous casting

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Journal of Iron and Steel Research International 2022年第11期29卷 1807-1822页

作者： Hai-biao Lu Yun-bo Zhong Zhong-ming Ren Wei-li Ren Chang-gui Cheng Zuo-sheng Lei State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081HubeiChina

Electromagnetic stirring(EMS)is a well-known and widely used technology for controlling the fluid flow in continuous casting mold,and therein the selection of stirrer position is closely related to final *** investigate the effect of stirrer position on initial solidification and inclusion capturing,a mathematical model coupling with electromagnetic field,turbulence flow,solidification,and inclusion movement was *** comparing the magnetic flux density,flow field and solidified shell thickness with measured data,the reliability of the mathematical model was *** uniform index has been introduced to judge the uniformity of solidified shell,and the washing effects of EMS on the numbers and distribution of captured inclusions were *** results show that a diagonal jet flow toward the mold wide face has generated when EMS is applied,and upper EMS position can effectively improve the uniformity of temperature and the solidified shell within the ***,due to the washing effect of EMS,the number of inclusions inside the solidified shell decreases,and the distribution of captured inclusions along the mold width changes *** the stirrer position,the uniform index decreases firstly and then increases,and the probability of inclusion capture by solidified shell ***,the upper stirrer position is suggested,with which the uniformity of solidified shell and cleanliness of slab are rational.

关键词： Slab continuous casting EMS position Flow Heat transfer Uniform index solidified shell Inclusion capture

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