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Model control technologies of dynamic secondary cooling and soft reduction for slab continuous casting

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Baosteel Technical Research 2012年第3期6卷 61-64页

作者： ZHANG Qunliang GUO Zhaohui Automation Division Research InstituteBaoshan Iron&Steel Co.Ltd.Shanghai 201900China

Dynamic model control technologies of secondary cooling and soft reduction of Baosteel are introduced. Model principle and control system architecture are summarized, as well as functions and features. Finally, applications of model technologies are discussed. The self-developed dynamic secondary cooling model and the dynamic soft reduction model have been applied on several casting machines inside and outside Baosteel, desired control effects were achieved with good stability and reliability. Temperature measurement results verified the correctness of model.

关键词： slab casting secondary cooling soft reduction dynamic model control

Effect of Asynchronous Adjustments of Clamping Cylinders on Triangular Crack of slab castings Under Application of Soft Reduction

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Journal of Iron and Steel Research International 2013年第2期20卷 38-47页

作者： LIU Ke CHANG Yun-he HAN Zhan-guang ZHANG Jia-quan State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing

Soft reduction is known to be one of the best ways to improve the internal quality of slab castings such as center segregation, center porosity, centerline or triangular zone cracks, which is based on a proper adoption of the amount of reduction upon the given final solidification zone through roll gap adjustments. The synchronization of the clamping cylinders for roll gap adjustments should be very important to the application of soft reduction, including the synchronization of the clamping cylinders adjustments in the same and different segments. The synchronization of clamping cylinders adjustments is mainly affected by the adjustable accuracy of the four position-controlled clamping cylinders mounted in the upper frames of the segments according to a predetermined transformation relationship between the signals of displacement sensors and aimed roll gap, which, however, is also influenced by the installation accuracy, the precision of displacement sensors, the deformation of the segment frames and/or its bearing pedestals. Due to the actual asynchronous adjustments of the four clamping cylinders, the dynamic soft reduction operation is normally applied at non-ideal mechanical conditions. Here 7 possible situations of asynchronous adjustments of the local segments which may induce gap deviation have been presented. The roll gap deviation in the soft reduction region of a slab casting has been studied by a 3-D visco-elastic plastic FEM model, through which the additional inter-roll bulging, the related triangular cracks induced by one kind of the possible asynchronous adjustment situation and the effectiveness of soft reduction have been analyzed. A critical tolerance for the gap adjustments has been proposed for better contribution of soft reduction to the internal quality of slabs.

关键词： slab casting soft reduction clamping cylinder asynchronous adiustment

Numerical Simulation of Linear Electromagnetic Stirring in Secondary Cooling Region of slab Caster

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Journal of Iron and Steel Research International 2003年第3期10卷 16-21页

作者： HUANGJun-tao WANGEn-gang HEJi-eheng FudanUniversity Shanghai200433China NortheasternUniversity Shenyang110004China

According to the theory of alternating magnetohydrodynamics and magnetic boundary renewal method,mathematical models were proposed for electromagnetic stirring in secondary cooling region( SEMS) of slab caster. The magnetic fields and flow fields of melt were simulated with SEMS. It's shown that the electromagnetic forces with inward and sidelong components produced by travel magnetic field at the wide faces of slab make the melt whirling in horizontal section,and the convection of the melt is strengthened obviously there. In addition,magnetic flux density attenuates from the edge to the center of slab,and the profile of the melt velocity along slab thickness in the center of the horizontal section takes a two-opposite-peak configuration. Ultimately,the stirring intensity and features are determined by the electromagnetic parameters,coil arrangement and stirring types.

关键词： slab casting secondary cooling region linear electromagnetic stirring numerical simulation

Full-scale Water Modeling on Flow Field of Continuous casting Mold

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China's Refractories 2021年第2期30卷 51-54页

作者： Hang YE Tianfei MA Gernot HACKL Jianhua LUO Gongjie TAO RHI Magnesita Dalian 116600China RHI Magnesita Leoben 8700Austria Ansteel Group Anshan 114001China

In the continuous casting process of aluminum killed steel grades,nozzle clogging is a common *** is usually injected into the casting channel through stoppers or nozzles to minimize clogs;however,complex two-phase flow regimes appear,and the flow in the mold might *** could result in a higher defect rate in the cast product and should be avoided as much as ***,it is important to understand the interaction between process conditions and the refractory products used and their impact on the flow pattern in the *** this study,a full-scale water model was established to simulate the slab casting *** nozzle shapes and three immersion depths were applied to investigate the flow behavior and liquid level fluctuations by the full-scale water *** relationship between the flow behavior and continuous casting parameters was *** results provide guidance for the design and production of the refractory nozzle and the operation of the continuous casting plant.

关键词： slab casting full-scale water model argon blowing level fluctuations

Anchor-Shaped Design of a Submerged Entry Nozzle for the Continuous casting of Steel

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Open Journal of Applied Sciences 2016年第9期6卷 593-600页

作者： Carlos A. Hernandez Miguel A. Barron Raul Miranda Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico Departamento de Electronica Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

An anchor-shaped geometrical design for a Submerged Entry Nozzle for the slab continuous casting of steel is presented in this work. To evaluate its performance, transient 3D multiphase numerical simulations were carried out using the Computational Fluid Dynamics technique. The performance of the proposed nozzle is numerically compared with that of a conventional cylindrical nozzle. Computer results show that the chance of formation of Karman’s vortexes and powder entrapment becomes small for the anchor-shaped SEN.

关键词： Anchor-Shaped SEN Computational Fluid Dynamics Continuous casting Numerical Simulations slab casting Submerged Entry Nozzle

High-productivity Plants and Innovative Technologies Meet Market Demands and Future Trends

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High-productivity Plants and Innovative Technologies Meet Ma...