Control of Surface Quality of 0.08%&lt;C&lt;0.12% Steel Slabs in Continuous Casting.

Guyot, Vincent; Martin, J.D.; Ruelle, Alain; d'Anselme, Amaury; Radot, J.P.; Bobadilla, Manuel; Lamant, J.Y.; Pontoire, J. N.

doi:10.2355/isijinternational.36.suppl_s227

Cited by 18 publications

(9 citation statements)

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“…Specifically, various aspects of liquid steel flow control in molds are well related with design of the discharging ports. As reported for different authors, unsuitable fluid flow patterns induce various superficial defects on slabs like pencil pipes, longitudinal and subsurface cracks, [1][2][3][4][5][6] flux infiltration problems, etc. The severity of those problems can affect considerably the caster productivity due to downgraded steel, product rejection and customer claims.…”

Section: Introductionmentioning

confidence: 85%

Numerical Optimization of Nozzle Ports to Improve the Fluidynamics by Controlling Backflow in a Continuous Casting Slab Mold

et al. 2013

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In order to improve the fluid flow patterns inside the mold, a better understanding of the backflow phenomenon and its controlling parameters is necessary; then a mathematical simulation of the fluidynamics in the mold and the submerge entry nozzle (SEN) are carried out considering two typical nozzle designs and different modifications applied to the outlet ports. The numerical model considers isothermal three dimensional continuity and the Navier-Stokes equations in Cartesian co-ordinates, which are solved together with the k-ε standard turbulence and the Volume of Fluid (VOF) models through the volume finite method. The results show that the backflow phenomenon emerges from an inadequate SEN port design, when a boundary layer separation is generated before the steel is delivered to the mold. This separation occurs at the upper internal side of the port inducing a low pressure zone with high levels of kinetic energy dissipation, producing the backflow phenomenon. From the analysis, it is concluded that the implementation of a radius at the internal upper side of the port avoids the separation of the boundary layer, eliminating the backflow phenomenon which allows the use of the complete effective exit area of the port; this is reflected in a velocity decrease of the jets and consequently a velocity decrement of the bulk flow. Furthermore, the size of the radius controls the penetration angle of the jets, the impact point position and the meniscus deformation; which avoids the need of the inclination angle of the port.

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Section: Introductionmentioning

confidence: 85%

Numerical Optimization of Nozzle Ports to Improve the Fluidynamics by Controlling Backflow in a Continuous Casting Slab Mold

et al. 2013

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“…Longitudinal cracks on the slab surface are one of the most serious defects that can occur during continuous casting [1][2][3]. These cracks reduce not only the surface quality of a slab but also productivity [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of mould level instability on the unevenness of solidified shell deformations during continuous casting

Furumai¹,

Zurob

Phillion

et al. 2023

Ironmaking & Steelmaking

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The influence of mould level instability during continuous casting on the unevenness of the initial solidified shell in hypo-peritectic steels has been investigated. Water model experiments and inplant casting experiments revealed that mould level instability, which increases with increasing casting speed, is related to longitudinal cracking resulting from the unevenness of the solidification shell. A numerical model which considers the effect of mould level instability was developed and used to simulate the formation of the unevenness of the solidification shell and solidified shell deflections. The calculation results show that an increase in the non-uniform infiltration of mould flux increases the unevenness of the solidified shell. On the other hand, the unevenness of the solidified shell decreases due to mild cooling. Overall, the results of the plant tests and calculations show that non-uniform infiltration of mould flux dramatically affects air gap formation and the unevenness of the solidified shell.

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“…[1] Following are the factor affected on longitudinal cracks. Peritectic reaction leads to rapid shrinkage of the green shell and separation from the mold The separation from the mold of solidification shell occurs because of intensively shrinkage induced by peritectic reaction [1][2][3][4][5][6][7][8][9] . The air gap formed prematurely leads to insufficient cooling of the slab and thin shell thickness A thinner solidification shell occurs by inefficient cooling because of previous air gap, which results in longitudinal crack easily.…”

Section: Introductionmentioning

confidence: 99%

Formation of break-out induced by longitudinal crack of billet

Zhao¹,

Gao²,

Wang³

et al. 2022

J. Phys.: Conf. Ser.

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Due to the characteristics of large shrinkage, peritectic steel is sensitive to longitudinal crack defects. Through the analysis of the breakout shell of a domestic factory, the mechanism of longitudinal crack breakout of peritectic steel is revealed. The following conclusions are obtained: the carbon content of the steel is 0.077%, which is in the peritectic range, but Mn / S = 128, and the ratio of manganese and sulfur is relatively high. Although P + S = 0.0263%, the longitudinal crack defect still occurs when the harmful elements are very low. When breakout occurs, the superheat is 35 °C, the drawing speed is 2.5m/min, which is one of the main causes of longitudinal crack. The longitudinal crack occurs about 200-600mm away from the mold bottom and on the center of the side. After the original shell is formed, intermittent unevenness occurs. This unevenness can sometimes be repaired, but sometimes can’t. Therefore, the longitudinal crack and break-out are easy to occur after the thinner blank shell leaves the mold.

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Control of Surface Quality of 0.08%<C<0.12% Steel Slabs in Continuous Casting.

Cited by 18 publications

References 0 publications

Numerical Optimization of Nozzle Ports to Improve the Fluidynamics by Controlling Backflow in a Continuous Casting Slab Mold

Numerical Optimization of Nozzle Ports to Improve the Fluidynamics by Controlling Backflow in a Continuous Casting Slab Mold

Influence of mould level instability on the unevenness of solidified shell deformations during continuous casting

Formation of break-out induced by longitudinal crack of billet

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