• Title/Summary/Keyword: Thin slab casting

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The Analysis of Deformation Behavior in Thin Slab Caster (박슬라브 연주주편 변형 거동해석)

  • 배원병;박해두;이호국
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1996.03a
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    • pp.165-171
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    • 1996
  • Recently, to improve the productivity in the continuous casting process, thin slab continuous caster which is one of the new steelmaking technologies by a high speed casting has been introduced. In the process of the thin slab continuous cast, there is more possibility than convnetional one that the deformation be occurred by the bulging of solidified shell, since the thickness of soliidfied shell is very thin as much as 60mm after the casting is finished. In some cases of severe bulging, there might be more breakout. In this paper, using finite difference method , solification analysis of slab is made as well as the thicknessof solidified shell and temperature are calculated. Also, based on the data of the calculated temperature, the deformed behavior of solidified narrow face is anlayzed with the MARC which is a package program for finite element analysis.

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A Deformation Behavior Analysis of Dynamic Bulging in the Mini-Mill Continuous Casting System (Mini-Mill 연속주고기의 동적 Bulging해석 Model(I) -주편의 변형거동을 중심으로-)

  • 한성욱;정영진;강충길
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1998.03a
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    • pp.138-143
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    • 1998
  • The continuous casting process has been adopted increasingly in recent years to save both energy and labor. It has experienced a rapid development in the production of semi-finished steel products, replacing the conventional route of ingot casting plus rolling. To achieve this good merit, however, more studies about a heat transfer mechanism between roll and slab are needed. So this paper shows the results of the deformation behavior of steel cast slabs, which are about the solidification and heat transfer. This study is used to prevent internal cracks of a slab in a bending and unbending zone. The value of moving strand shell bulging between two supporting rollers under ferrostatic pressure and slab-self weight has been computed in terms of creep and elastic-plasticity. The high strand distributions in solidified shell undergoes a series of bulging are calculated with boundary condition a very closed to continuous steel cast slabs productions.

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Degradation of ZrO$_2$-C Material for Submerged Entry Nozzle in Thin Slab Casting (박슬라브 연주용 침지노즐 슬래그 라인부의 조직열화 거동)

  • 하창수
    • Journal of the Korean Ceramic Society
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    • v.35 no.3
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    • pp.251-258
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    • 1998
  • Behaviro of ZrO2-C mateial used for submerged entry nozzle in thin slab casting was investigated. De-gradation of the material has been found to result from breakup of zirconia aggregate refered to as "destabilization" Destabilization is almost completed during preheating procedure and shows an increasing tendency as the purity of zirconia aggregate decreases and as the content of metallic Si used in ZrO2-C aggregate during preheating. Such concentrated components make grain boundary wider but do not cause any additional destabilization of zirconiaf zirconia.

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Analysis of Mixed Grade Transition in Continuous Thin Slab Casting with EMBR

  • J.H. Ahn;J.K. Yoon;이정의
    • Transactions of Materials Processing
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    • v.8 no.3
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    • pp.271-271
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    • 1999
  • A concentration change during grade transition operation in thin slab casting is investigated through computer simulation and the results are compared with experimental measurements. Fluid flow and mixing patterns in various tundish levers and flow rates were analysed by a three-dimensional mathematical model. Based on the contained results, a simple, efficient and accurate computational model is suggested to predict the concentration profile at the outlet of the tundish. Based on the model, mixing in and below the mold was analyzed considering electromagnetic braking force. The predicted concentration profiles show good agreements with the measured values. It is found that the lower vortices in the mold are suppressed by the electromagnetic field and a plug-like flow region develops, which decreases the intermixing of two different grades of steel and shortens the length of transition region.

Dynamic Bulging Behavior Analysis by Finite Difference Method in High Speed Continuous Casting of Thin Slab (유한 차분법에 의한 Thin Slab 고속 연속주조의 동적벌징 거동해석)

  • Jeong, Yeong-Jin;Sin, Geon;Jo, Gi-Hyeon;Gang, Chung-Gil
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.7 s.178
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    • pp.1650-1660
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    • 2000
  • Continuous casting process has been adopted increasingly in recent years to save both energy and labor. It has experienced a rapid development in the production of semi-finished steel products, rep lacing the conventional route of ingot casting and rolling. In order to achieve this merit, however, more studies about the mechanism between roll and slab are needed. In this paper, a dynamic bulging in steel cast slabs was simulated by considering the solidification and heat transfer. This study is to prevent internal cracks of a slab in a bending and unbending zone. The value of moving strand shell bulging between two supporting rollers under the ferrostatic pressure and slab-self weight has been calculated in terms of creep and elasto-plasticity. The strain and strain rate distributions in solidified shell undergoing a series of bulging are calculated with working boundary conditions.

Numerical Prediction of Phase Change within the Molten Steel with Thin Slab Casting (박슬라브 주형에 따른 용강내의 상변화현상에 대한 수치적 해석)

  • 최원록;유홍선;최영기
    • Journal of the Korean Society of Safety
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    • v.15 no.3
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    • pp.14-22
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    • 2000
  • A numerical analysis has been performed on the two-dimensional rectangular gallium melting problem using the enthalpy method. The major advantage of this method is that the physical domain is discretized with fixed grids without transforming variables and the interface conditions of phase change are accounted for the definition of suitable source terms in the governing equations. But in the fixed method, there is some ambiguity in defining the porosity constant which has no physical interpretation. If the velocity correction is included in the momentum equation, for the appropriate range of porosity constant, the realistic predictions are obtained. The object of the present work is to predict the phase change within the molten steel with thin riser slab using the modified enthalpy-porosity method. The computational procedures for predicting velocity and temperature are based on the finite volume method and the non-staggered grid system. The influence of natural convection on the melting process is considered. A comparison with the experimental results shows that the modified method is better than the previous one.

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Recent Trends in Flat Hot Rolling of Steel (열간 압연판재 제조기술의 최신동향)

  • 이준정
    • Transactions of Materials Processing
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    • v.11 no.1
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    • pp.24-35
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    • 2002
  • Recent trend and future prospect of flat rolling of steel has been summarized based on the earlier reports. Key technology in the plate rolling is to have ultra fine microstructure having high resistance against crack propagation during application. Heavy accelerated cooling facility and high power rolling mill will be helpful to develope the high toughness steel. Precise modeling of properly prediction based on deformation and transformation imposed on microstructure of steel during processing is highly anticipated. For the hot strip rolling process, new trend is lies on the production of ultra-thin gauged hot strip to substitute cold rolled strip. For the substitution of cold rolled strip into hot rolled strip widely, high formable property of hot strip is highly required. For the formabilit, the ferritic rolling of extra low carbon steel under high lubricated condition is essential. Recently introduced semi-continuous thin slab and rolling mill line is very plausible to develope those kinds of products easily In the view groin facility combination. New idea to modify the existing continuous hot strip mill line to produce the ultra thin-gauged hot strip in an economic way is suggested in this report.

The Analysis of Width Deformation Behavior in Thin Slab Casting and Rolling Process (박슬라브 열간압연공정에서 폭거동해석)

  • 박해두;김형전;송길호
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1997.03a
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    • pp.249-252
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    • 1997
  • Mini-mill process which is one of the new steel making process to be able to produce the hot rolled strip by thin slab caster, was completed in the kwangyang steel work. The new process was constructed liquid core deduction, tandem reduction unit, induction heater, coil box and finishing mill to be varied width. Therefore, in oder to make sure of target strip width, analysis of actual plant data was done to fine out amount of width deviation. Finally, the predication system of width in the mini-mill process was developed to included temperature caculation model.

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Mechanism of Surface Corrosion in the Continuous Casting Guide Rolls

  • Fazlollah Sadeghi;Tahereh Zargar;Yoon-Uk Heo;Jae Sang Lee;Dong-Yong Park;NamKyu Park;Dae Geun Hong;Chang Hee Yim
    • Journal of Korea Foundry Society
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    • v.43 no.2
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    • pp.55-63
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    • 2023
  • Due to the importance of the surface on the final slab quality, it is essential to maintain a smooth segment roll surface that is in touch with the thin solid shell during solidification. In this paper, the surface of the used continuous casting guide roll was analyzed to realize the mechanism of its surface deterioration. Surface analysis has revealed severe corrosion at two distinct areas leading to deep roughness occurring on the guide roll. Firstly, the severe corrosion follows prior austenite grain boundary due to exposure with acidic environment. Also, in heat affected zone (HAZ) where two cladding beads overlap, more severe corrosion takes place. The overheat input results in local ferritization without full melting which increases retained δ-ferrite content almost 10 times higher than surrounding area. Corrosion was observed to happen at the δ-γ interface where Cr depletion takes place.