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.

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.

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 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.

scholarly journals Investigation of internal defects formation reasons in copper billet obtained at rotary continuous casting machine (CCM)

2020 ◽  
Vol 28 (1) ◽  
pp. 48-54
Author(s):  
A.N. Smirnov ◽  
◽  
V.E. Ukhin ◽  
A.P. Verzilov ◽  
Ali Naseri ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Internal Defects

Sensorless electric drive of the mixture supply system in the mold of the continuous steel casting installation

2021 ◽  
pp. 16-21
Author(s):  
K. V. Litsin ◽  
D. M. Utyamishev
Keyword(s):  
Continuous Casting ◽  
Electric Drive ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Steel Production ◽  
Angular Speed ◽  
Quality Level ◽  
Actual Direction ◽  
Vector Control System ◽  
The Cost

The system of automatic feeding of the slag-forming mixture into the mold of the continuous casting machine was investigated in this article. The necessity of using a slag-forming mixture in the process of steel production has been substantiated. The proofs are given that the consumption of the slag-forming mixture significantly affects the cost of the final product. The quality level of the final product depends on the uniformity and consistency of the mixture supply to the crystallizer. Therefore, the actual direction is the automation of the process of feeding the slag-forming mixture into the mold of the continuous casting machine. The description of the developed automatic installation, which implements the supply of slag-forming mixture, is presented. The necessity of using a sensorless electric drive for moving the trolley has been substantiated. A simulation model of a bogie electric drive with a vector control system based on sensorless determination of the angular speed of the engine has been developed. The description of the method for determining the angular speed of the motor based on the known values of phase voltages is given. The simulation of the developed electric drive system in the Matlab Simulink program, confirming the adequacy of the developed system. The introduction of a sensorless electric drive into the system for feeding the mixture into the mold of the continuous casting machine will increase the reliability of the entire system and reduce its weight and dimensions.

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