scholarly journals Physical Modelling of Tundish Slag Entrainment under Various Technological Conditions

2017 ◽  
Vol 62 (3) ◽  
pp. 1467-1471 ◽  
Author(s):  
K. Michalek ◽  
K. Gryc ◽  
L. Socha ◽  
M. Tkadlečková ◽  
M. Saternus ◽  
...  
Keyword(s):  
Physical Model ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Physical Modelling ◽  
Critical Periods ◽  
Operational Conditions ◽  
Modelling Methodology ◽  
Slag Entrainment ◽  
The Individual

AbstractThis paper deals with the issue of physical modelling of vortexes creation and tundish slag entrainment over the mouth of the nozzle into the individual casting strands. Proper physical model is equivalent to the operational continuous casting machine No. 2 in TŘINECKÉ ŽELEZÁRNY, a.s. Physical modelling methodology and simulated operational conditions are shortly described. Physical modelling was used for the evaluation of current conditions of steel casting at the application of different impact pads in the tundish. Further, laboratory measurement on the physical model aiming the determination of exact critical periods of vortexes creation and study of the slag entrainment as a consequence of changes in surface level during the tundish refilling to standard level were realised. The obtained results were analysed and discussed.

scholarly journals Study of Tundish Slag Entrainment Using Physical Modelling

2016 ◽  
Vol 61 (1) ◽  
pp. 257-260 ◽  
Author(s):  
K. Michalek ◽  
K. Gryc ◽  
L. Socha ◽  
M. Tkadlečková ◽  
M. Saternus ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Physical Model ◽  
Critical Level ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Physical Modelling ◽  
Operational Conditions ◽  
Modelling Methodology ◽  
Slag Entrainment

This paper deals with the possibilities of using physical modelling to study the slag entrainment in the tundish. A level of steel in the tundish is changing during sequential continuous casting. The most significant decrease in the steel level occurs when replacing ladles. It is generally known that if the height of steel level in the tundish drops below a certain critical level, it may generate vortexes over the nozzles and as a consequence entrainment of tundish slag into individual casting strands can occur. Thus, it is necessary to identify the critical level of steel for specific operational conditions. In this paper, the development of physical modelling methodology is described as well as physical model corresponding to operational continuous casting machine No. 2 in Třinecké železárny, a.s. The obtained results are discussed.

Designing of a Novel Shroud for Improving the Quality of Steel in Tundish

2012 ◽  
Vol 585 ◽  
pp. 359-363 ◽  
Author(s):  
Debasish Chatterjee
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Steel Production ◽  
Metal Bath ◽  
Ladle Slag ◽  
Exchange Operation ◽  
Slag Entrainment ◽  
Steel Flow

In present 92.8% of world steel production is casted on continuous casting machine. The key phase of continuous casting is tundish. Beside of refining effect of slag phase also steel flow in tundish is very important factor. The main causes for inclusion formation and contamination of the melt include reoxidation of the melt by air and carried over oxidizing ladle slag, entrainment of tundish and ladle slag, and emulsification of these slags into the melt. These causes are due to generation of turbulence in the melt. Although turbo stop lowers the turbulence in some extent. But it is not capable of totally decrease of turbulence specially during lowering of metal bath at the time of ladle exchange operation, cause contamination of the steel melt in tundish. So in the present work it has been focused to develop a novel shroud which have significant role to supply of steel from ladle to tundish at slow rate to avoid turbulence, emulsification and formation of slag eye in tundish to produce quality steel in a sustained manner.

scholarly journals Computational experiment on determination of load on the rollers of continuous casting machine

2020 ◽  
Vol 178 ◽  
pp. 01032
Author(s):  
Navak Bashirov ◽  
Daniya Zaripova ◽  
Irina Bashirova
Keyword(s):  
Continuous Casting ◽  
Computational Experiment ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Cooling Water ◽  
Cooling Zone ◽  
Secondary Cooling ◽  
Secondary Cooling Zone ◽  
Required Quality

The article is devoted to calculations of load on rollers of a curvilinear continuous casting machine during bending of the ingot in the levelling section. The calculation takes into account the elastic and plastic characteristics of metal and the flexibility of the roller apparatus. Determination of load on rollers together with meeting other requirements such as reducing the cooling water consumption, minimizing the energy consumption enables optimizing the technology of slab cooling in the secondary cooling zone (SCZ) and obtaining metal of the required quality.

Estimation of minimal slab reduction to eliminate of axial porosity

2021 ◽  
pp. 34-38
Author(s):  
A.G. Kolesnikov ◽  
A.V. Aldunin ◽  
M.N. Sukhostavsky
Keyword(s):  
Hot Rolling ◽  
Continuous Casting Machine ◽  
Reduction Rate ◽  
Casting Machine ◽  
Cast Slab ◽  
Axial Porosity ◽  
Continuously Cast ◽  
Minimal Reduction ◽  
Axial Defect

In the production of the continuous cast slabs using continuous-casting machine, the formation of axial porosity is observed. Method for determination of the minimal reduction of the workpiece during hot rolling in order to eliminate the axial defect is presented. The theoretical dependences for transformation of the axial porosity on drawing and the reduction rate of continuously cast slab during hot rolling are obtained based on assumptions.

scholarly journals A Comparison of Models Describing Heat Transfer in the Primary Cooling Zone of a Continuous Casting Machine

2015 ◽  
Vol 60 (1) ◽  
pp. 239-244 ◽  
Author(s):  
K. Miłkowska-Piszczek ◽  
M. Rywotycki ◽  
J. Falkus ◽  
K. Konopka
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Casting Process ◽  
Research Problem ◽  
Cooling Zone ◽  
The Finite Element Method ◽  
Cast Slab ◽  
Thermal Boundary Conditions

Abstract This paper presents the findings of research conducted concerning the determination of thermal boundary conditions for the steel continuous casting process within the primary cooling zone. A cast slab - with dimensions of 1100 mm×220 mm - was analysed, and models described in references were compared with the authors’ model. The presented models were verified on the basis of an industrial database. The research problem was solved with the finite element method using the ProCAST software package.

MEST of Round Blooms with Different Foot Roll Pitch Designing for Peritectic Steel Casting

2011 ◽  
Vol 402 ◽  
pp. 147-150
Author(s):  
Li Gen Sun ◽  
Hui Rong Li ◽  
Li Guang Zhu
Keyword(s):  
Elevated Temperatures ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Mathematic Model ◽  
Key Factors ◽  
Cross Point ◽  
Peritectic Steel ◽  
Support Roller ◽  
The Cross

The minimum mould exit shell thickness (MEST) is one of key factors to consider for continuous casting machine design. Based on the shell strength at elevated temperatures, a concept of shell integral average strength, from its very top surface to the solidus frontier, has been introduced to judge its bulging tendency under ferrostatic pressure. Considering the contribution for the foot roller designing, a mathematic model for the determination of the minimum MEST has been brought forward. It is shown that, when the minimal foot roll pitch is fixed, the minimum MEST is steady. But at the same time, when the MEST does not exceed the minimum value, the round bloom off-round would happen, it is worse for the round bloom than the bulging for the normal strand. And there is the cross point with the curve of the minimum MEST by the minimum roll pitch and the minimum MEST by the fluting include angle of the support roller and the lateral support roller against the cross section.

Influence of Submerged Entry Nozzle on Intermixed Zone in Round Blooms with a Diameter of 525 mm / Wpływ Wylewu Zanurzeniowego Na Strefe Przejsciowa W Okragłych Wlewkach Ciagłych O Srednicy 525 mm

2013 ◽  
Vol 58 (1) ◽  
pp. 187-191
Author(s):  
K. Michalek ◽  
K. Gryc ◽  
M. Tkadlečková ◽  
J. Morávka ◽  
T. Huczala ◽  
...  
Keyword(s):  
Cross Section ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Submerged Entry Nozzle ◽  
Small Radius ◽  
Nickel Concentration ◽  
Proposed Model ◽  
Continuously Cast ◽  
The Right

This work compares the experimental results of nickel concentration measurements in the intermixed zone of the continuously cast round blooms with a diameter of 525 mm using two types of submerged entry nozzles (SEN) - a straight-through nozzle and one with 5-ports. Based on determination of the system and optical interface in the blooms a detailed study of concentration profiles on the bloom surface in a small radius area, on the right side and then also on a cross-section of the blooms, was carried out. The results were further analysed using approximation models, and were to be used to verify the proposed model for predicting intermixed zones for a continuous casting machine, developed based on the results of physical and numerical modelling.

scholarly journals IMPACT OF CAST SPEED ON THE OCCURRENCE OF THE NON-METALLIC INCLUSIONS IN STEEL

2016 ◽  
Vol 22 (1) ◽  
pp. 4
Author(s):  
Vladimír Rega ◽  
Marek Molnár ◽  
Martin Jusko ◽  
Branislav Buľko ◽  
Jozef Kijac ◽  
...  
Keyword(s):  
Continuous Casting Machine ◽  
Casting Machine ◽  
Atomic Emission ◽  
Light Emitting ◽  
Metallic Inclusions ◽  
Steel Cast ◽  
The Individual ◽  
The Impact ◽  
Inclusions In Steel ◽  
The Given

<p>This paper deals with the examination of the impact of steel cast speed on the occurrence of the non-metallic inclusions due to the investigation of the individual samples taken at different steel cast speeds. The aim of this paper was to identify and describe the relation between the non-metallic inclusions occurring in the metal and the cast speed variations at the continuous casting machine. The non-metallic inclusions within this investigation were identified by the method (AES) based on the atomic emission spectroscopy that evaluates the occurrence of the determined elements in the metal. This method applies the principle of the light emitting acquired by the high-voltage spark supply. The investigation of the impact of both the technological production parameters, and the casting on the cleanliness of the given absorption quality of steel leads to their optimization, as well as, to total minimization of occurrence of the non-metallic inclusions in the steel volume were studied.</p>

scholarly journals Scheme of stressed-deformed condition of continuous-casted slab in technological casting lines

2018 ◽  
pp. 290-299
Author(s):  
V.M. Poleshchuk ◽  
V.L. Brovkin
Keyword(s):  
Continuous Casting ◽  
Physical Model ◽  
Tensile Strain ◽  
Strain State ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Cast Billet ◽  
Continuous Cast ◽  
Bending Process ◽  
Deformed State

The aim of the work is to develop a model of the deformation-stressed state of a continuous-cast billet, taking into account its behavior in the continuous casting machine line. A new physical model of the ingot crust bending process in the inter-roller gap has been proposed. The model is based on the regularities of the change in the deformed state of the surface of the crust under the action of ferrostatic pressure. It is established that the crust undergoes a cyclic alternating deformation in the process of moving it across the inter-roller gap. It is shown that the surface of the crust comes into contact with the surface of the roller before approaching the inter-roller gap. This causes the appearance of an anomalous area with a constant curvature of the crust at the final stage of its buckling. The second anomalous deformation zone of the ingot crust is the junction zone of the previous crust and the subsequent inter-roller gap, where the crust instantly changes its curvature. In combination with the flat scheme of the stress-strain state, a physical model is presented, which makes it possible to identify in each of the inter-roller gaps the zone of maximum values of the tensile strain rate. Identifying the zone of maximum values of the tensile strain indicator and comparing it with the maximum allowable one allows determining and correcting the length of the inter-roller gaps of the continuous casting machine.

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