EP3725430A1 - Verarbeitungsvorrichtung für geschmolzenes material - Google Patents

Verarbeitungsvorrichtung für geschmolzenes material Download PDF

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Publication number
EP3725430A1
EP3725430A1 EP18888361.5A EP18888361A EP3725430A1 EP 3725430 A1 EP3725430 A1 EP 3725430A1 EP 18888361 A EP18888361 A EP 18888361A EP 3725430 A1 EP3725430 A1 EP 3725430A1
Authority
EP
European Patent Office
Prior art keywords
molten material
dam
inlet part
processing device
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18888361.5A
Other languages
English (en)
French (fr)
Other versions
EP3725430A4 (de
Inventor
Sung Jool Kim
Jeong Do Seo
Chong Tae Ahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP3725430A1 publication Critical patent/EP3725430A1/de
Publication of EP3725430A4 publication Critical patent/EP3725430A4/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/003—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with impact pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/118—Refining the metal by circulating the metal under, over or around weirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like

Definitions

  • the present invention relates to a molten material processing device and, more particularly, to a molten material processing device in which a dead volume is reduced to improve inclusion removal capacity.
  • Continuous casting apparatuses generally include a ladle for conveying molten steel, a tundish for receiving the molten steel from the ladle and temporarily storing the molten steel, a mold for primarily solidifying the molten steel into a slab while continuously receiving the molten steel from the tundish, and a cooling zone for secondarily cooling the slab continuously drawn from the mold and performing a series of forming operations.
  • Patent Document 1 proposes a method for constructing a plurality of refractory dams such as a dam, an auxiliary dam, and an induction dam within a tundish and then injecting an argon gas into molten steel through the auxiliary dam, thereby actively inducing an upward flow, rather than using a method for controlling a flow of molten steel utilizing a dam and a weir.
  • Patent Document 2 proposes a method for mounting an impact pad and a separation wall on a lower side of a shroud nozzle and allowing the molten steel to collide with the impact pad and to pass through a space between the separation wall and the impact pad, thereby actively inducing an upward flow of the molten steel.
  • the dead volume of the molten steel within the tundish increases, the degree to which the molten steel is retained within the dead volume becomes inappropriate, and the residence time of the molten steel may become excessively long. That is, when the dead volume of the molten steel within the tundish increases, the appropriate residence time of the molten steel within the tundish is not ensured. Also, when inclusions enter the dead volume, the inclusions are retained in a center of the dead volume due to a low flow rate of the molten steel, which prevents the inclusions from being floated and separated from the molten steel. The inclusions flow in a mold and cause inclusion-related quality failure in the slab.
  • the occurrence of the dead volume has to be minimized while actively inducing the upward flow of the molten steel within the tundish.
  • the present invention provides a molten material processing device capable of ensuring a sufficient and appropriate residence time of a molten material accommodated in a container.
  • the present invention provides a molten material processing device capable of reducing a dead volume of a molten material to improve inclusion removal capacity.
  • the present invention provides a molten material processing device capable of widely distributing an upward flow that reaches a top surface of a molten material.
  • a molten material processing device includes: a container which includes a molten material accommodation space formed therein, a molten material inlet part disposed at one side thereof, and a molten material outlet formed at the other side thereof; and a dam which is positioned between the molten material inlet part and the molten material outlet so that one surface thereof directly faces the molten material inlet part, and which is mounted on a bottom of the container and connected to two longitudinal direction side walls, wherein the dam is mounted on a drop area of a molten material formed below the molten material inlet part and has a top surface positioned in an upper portion of the molten material.
  • the dam may be mounted on an edge portion of the drop area.
  • the other surface of the dam directly may face a width direction side wall on the molten material outlet side.
  • a size of the drop area may be proportional to an inner diameter of the molten material inlet part, and a distance between the one surface of the dam and the molten material inlet part may be proportional to the size of the drop area.
  • a distance between the one surface of the dam and the molten material inlet part may be in a range of 2.5 to 5 times an inner diameter of the molten material inlet part.
  • a height of the top surface of the dam may be in a range of 0.5 to 0.75 times a melt height of the molten material.
  • the molten material processing device may further include a through-hole formed in the dam.
  • the through-hole may be formed in a lower portion of the dam, defined in a direction from the one side toward the other side, and have an inner wall directly connected to the bottom.
  • the dam is mounted on the bottom of the container so as to be positioned on the edge of the pouring zone of the molten material, and the height of the top surface of the dam may be optimized, thereby optimizing the flow field of the molten material.
  • the sufficient and appropriate residence time of the molten material accommodated in the container may be ensured, and the dead volume of the molten material may be reduced to improve the inclusion removal capacity.
  • the strong flow of the molten steel within the pouring zone is directed to the top surface of the molten material to form the upward flow, thereby widely distributing the upward flow that reaches the top surface of the molten material and further improving the inclusion removal capacity.
  • the inclusion in the molten material may be smoothly floated and separated to improve the cleanness of molten material, thereby improving the quality of the product made of the molten material.
  • the additional structure for reducing the flow rate of the molten material within the container may not be necessarily mounted, and the size and the number of the refractory structures mounted within the container may be minimized and optimized to simplify the structure. Therefore, the manufacturing costs may be reduced.
  • a molten material processing device provides a technical feature of reducing a dead volume of a molten material while increasing an area that an upward flow reaches in a top surface of the molten material, thereby improving inclusion removal capacity.
  • the molten material processing device is used in a continuous casting process of a steel mill, and may also be used in diverse casting processes using various molten materials. The embodiment of the present invention will be described with reference to the continuous casting process.
  • FIGS. 7 and 8 are schematic views illustrating a molten material processing device according to the embodiment of the present invention.
  • FIG. 7 is a cross-sectional view of the molten material processing device
  • FIG. 8 is a perspective view of the molten material processing device.
  • one direction is referred to as a direction in which one width direction side wall 1a is spaced apart from the other width direction side wall 1b
  • a vertical direction is referred to as a direction in which a molten material inlet part 2 extends.
  • the other direction is referred to as a direction perpendicular to both the one direction and a height direction.
  • the other direction is a direction in which a dam 3 of FIG. 8 extends.
  • the one direction may be referred to as a longitudinal direction
  • the other direction may be referred to as a width direction
  • the vertical direction may be referred to as the height direction.
  • the molten material processing device includes a container 1 including a molten material accommodation space formed therein, a molten material inlet part 2 disposed at one side thereof, and a molten material outlet 1c formed at the other side thereof.
  • the molten material processing device includes a dam 3 which is positioned between the molten material inlet part 2 and the molten material outlet 1c so that one surface thereof directly faces the molten material inlet part 2, and which is mounted on a bottom of the container 1 and connected to two longitudinal direction side walls 1d.
  • the dam 3 is mounted on a drop area of a molten material formed below the molten material inlet part 2 and has a top surface positioned in an upper portion of the molten material.
  • the molten material may include molten steel.
  • the molten material is stored in a conveyance container, for example, a ladle (not shown) and conveyed to the molten material processing device.
  • the molten material may be positioned above the container 1 and connected to the molten material inlet part 2.
  • the molten material may be injected into the container 1 via the molten material inlet part 2.
  • the molten material may include various materials in addition to the molten steel.
  • a lower portion of the molten material is a section ranging from the bottom of the container 1 to a height that is less than 0.5 times the height of a melt height of the molten material.
  • an upper portion of the molten material is a section ranging from a height, which is 0.5 times the melt height of the molten material, to the melt height of the molten material. For example, when the height of the bottom of the container 1 is zero, and the melt height of the molten material is 1, the height from 0 to a height that is less than 0.5 corresponds to the lower portion of the molten material, and the height from 0.5 to 1 corresponds to the upper portion of the molten material.
  • the melt height of the molten material is referred to as the height of the molten material that has the constant height within the container 1 in a steady state during the continuous casting process.
  • the melt height of the molten material may be referred to as a molten steel level or a melt level.
  • the steady state means that a flow of the molten material within the container 1 is in a steady state.
  • the molten material inlet part 2 is a refractory nozzle through which the molten material is able to pass, and may be a shroud nozzle.
  • the molten material inlet part 2 is mounted on a manipulator (not shown), and as the manipulator rises, an opening of an upper end thereof may be coupled to a collector nozzle (not shown) of a conveyance container.
  • the molten material inlet part 2 may be disposed at one side of the container 1 and spaced apart from the bottom of the container 1. Also, an opening of an lower end thereof may be positioned within the container 1, and at least a portion thereof may be immersed in the molten material.
  • a molten material-dropping area (hereinafter, referred to as a drop area) is defined below the molten material inlet part 2.
  • the drop area is an area through which the molten material, which has passes through the molten material inlet part 2 and then has been injected into the container 1, passes first.
  • the molten material having relatively high energy after falling from the molten material inlet part 2 and colliding with the bottom of the container 1, may flow along the bottom at a predetermined flow rate. Subsequently, as moving away from the drop area, the flow rate of the molten material gradually decreases, and the molten material having relatively low energy may flow at a normal flow rate.
  • the drop area is formed on the bottom of the container 1, and a center c thereof is vertically aligned with a vertical central axis (not shown) passing through a center of the molten material inlet part 2.
  • the size of the drop area for example, the width in the one direction is proportional to the inner diameter of the molten material inlet part 2. As the inner diameter of the molten material inlet part 2 increases, the size of the drop area also increases in proportion to the inner diameter of the molten material inlet part 2.
  • the inner diameter of the molten material inlet part 2 may be an inner diameter with respect to the opening of the lower end of the molten material inlet part 2, and the one direction may be a direction from the molten material inlet part 2 toward the molten material outlet 1c, as a direction in which the container 1 extends.
  • a distance between an edge end of the drop area in the one direction and the center c may be 2.5 to 5 times an inner diameter d of the molten material inlet part 2.
  • the molten material may actively flow within a predetermined range of flow rates.
  • the molten material in the drop area has a meaningful flow rate.
  • the molten material has the meaningful flow rate means that the molten material has a flow rate enough to form an upward flow instead of descending after colliding with the dam 3 and flooding.
  • the flow of the molten material in the drop area may affect the entire flow of the molten material within the container 1, and thus the drop area may be significantly meaningful area.
  • the drop area may be referred to as a pouring zone.
  • the container 1 includes the accommodation space formed therein, the molten material inlet part 2 disposed at the one side thereof, and the molten material outlet 1c formed at the other side thereof.
  • the container 1 may include, for example, a tundish.
  • the tundish may be a rectangular tundish that lengthily extending in the one direction.
  • the container 1 may include a rectangular bottom extending in the one direction and the other direction perpendicular to the one direction, two longitudinal direction side walls 1d which respectively extend along two long sides of edges of the bottom in the one direction and protrude vertically, and one width direction side wall 1a and the other width direction side wall 1b which respectively extend along two short sides of the edges of the bottom in the other direction and protrude vertically.
  • the molten material inlet part 2 may be disposed relatively close to the one width direction side wall 1a, and the molten material outlet 1c may be disposed relatively close to the other side wall 1b.
  • the bottom of the container 1 may have a stepped portion in which the height at the other side is lower than the height at the one side.
  • a molten material accommodation space may be formed by the bottom, the two longitudinal direction side walls Id, the one width direction side wall 1a, and the other width direction side wall 1b.
  • the two longitudinal direction side walls 1d face each other in the other direction, and the one width direction side wall 1a and the other width direction side wall 1b face each other in the one direction.
  • the molten material inlet part 2 is disposed at one side of the bottom, and the molten material inlet part 2 may be vertically spaced apart from the one side of the bottom and disposed in the upper portion of the container 1. Also, the molten material outlet 1c may be formed by vertically passing through the other side of the bottom.
  • An outlet nozzle (not shown), for example, an immersion nozzle is installed to pass through the molten material outlet 1c from below the container 1, and a mold (not shown) surrounding a lower portion of the immersion nozzle is disposed.
  • An opening degree of the molten material outlet 1c is adjusted by a slide gate (not shown) and may discharge the molten material into the mold. In the mold, the molten material may be solidified into a slab.
  • a cooling zone (not shown) may be provided below the mold.
  • a series of forming operations is performed by cooling and pushing down the slab continuously drawn from the mold.
  • the slab that has passes through the cooling zone is cut by a cutting part, and then may be conveyed to rolling equipment or various post-processing equipment according to purposes.
  • the container 1 has functions of adjusting and distributing a supply of the molten material to a mold (not shown), reducing pressure due to weight of the molten material, for example, ferrostatic pressure, and removing an inclusion through a flow control of the molten material to improve the cleanness.
  • a dam 4 is mounted on the bottom of the container 1 so as to remove the inclusion.
  • the dam 4 has a function of controlling the flow of the molten material to increase a residence time of the molten material, thereby floating the slag and the inclusion, contained in the molten material, to the top surface of the molten material, for example, to a melt surface. As the slag and inclusion floating to the top surface are separated from the molten material, the mixing of the inclusion and the slag into the mold may be minimized.
  • the dam 3 is positioned between the molten material inlet part 2 and the molten material outlet 1c so that one surface thereof directly faces the molten material inlet part 2, and is mounted on the bottom of the container 1, extends in the other direction, and is connected to the facing surfaces of the two longitudinal direction side walls 1d.
  • the dam 3 may raise the flow of the molten material, which is supplied from the molten material inlet part 2 to the container 1 and flows along the bottom, toward the upper portion of the container 1.
  • the one surface of the dam 3 is a surface which faces the molten material inlet part 2 and one width direction side wall 1a among two side surfaces of the dam 3 extending in the width direction and the vertical direction.
  • the other surface of the dam 3 is a surface which faces the molten material outlet 1c and the other width direction side wall 1b among the two side surfaces of the dam 3 described above.
  • the one surface of the dam 3 may be referred to as a front surface
  • the other surface of the dam 3 may be referred to as a rear surface.
  • the feature, in which the dam 3 is positioned between the molten material inlet part 2 and the molten material outlet 1c so that one surface thereof directly faces the molten material inlet part 2, means that there are no separate structures between the dam 3 and the molten material inlet part 1.
  • the separate structures may include various wall bodies such as weirs and auxiliary dams, containers such as impact pads, and other various structures having diverse shapes. That is, since a separate structure is not mounted between the dam 3 and the molten material inlet part 2, the one surface of the dam 3 may directly face the molten material inlet part 2.
  • the dam 3 is mounted to directly face the molten material inlet part 2 and, the flow of the molten material supplied to the drop area may be controlled by being affected directly by the dam 3 without interference. That is, after dropping to the bottom, the molten material collides with the dam 3 first, and thus the upward flow may be formed.
  • the dam 3 may be mounted on the drop area so as to effectively induce the upward flow of the molten material.
  • the dam 3 in order to avoid direct collision with the molten material that is being dropping, the dam 3 is mounted on an edge portion of the drop area in the other direction, facing the molten material within the drop area.
  • the dam 3 may first come into contact with the molten material that flows along the bottom of the container 1 in a direction from the one side toward the other side of the container 1. That is, at the edge portion of the drop area, the dam 3 may be directly exposed to the molten material within the drop area and may come into direct contact with the same.
  • coming into direct contact with means that, for example, the molten material first comes into contact with the dam 3 before the flow of the molten material is controlled due to the collision with a separate structure.
  • the dam 3 since only the dam 3 is provided within the drop area, the molten material within the drop area may come into contact only with the dam 3 except for the bottom and the side walls of the container 1.
  • the other surface of the dam 3 may directly face the width direction side wall 1b at the molten material outlet 1c. That is, there are also no separate structures between the dam 3 and the molten material outlet 1c. As described above, only one dam 3 is mounted within the container 1, and the flow of the molten material may be controlled by the one dam 3.
  • the distance between the one surface of the dam 3 and the molten material inlet part 2 may be proportional to the size of the drop area. As the size of the drop area increases, a distance L between the one surface of the dam 3 and the molten material inlet part 2 may increase. Here, the distance between the one surface of the dam 3 and the molten material inlet part 2 may be in a range of 2.5 to 5 times an inner diameter d of the molten material inlet part. Accordingly, at least one surface of the dam 3 may be positioned on the edge portion of the drop area. The top surface of the dam 3 may be positioned in the upper portion of the molten material.
  • the height H of the top surface of the dam 3 may be in a range of 0.5 to 0.75 times the melt height of the molten material.
  • the height of the top surface of the dam 3 is less than 0.5 times the melt height of the molten material, a smooth upward flow may not be formed, and it is difficult for the molten material to widely rise to the melt surface.
  • the dam 3 may prevent the molten material from being widely spread to the melt surface.
  • the height of the top surface of the dam 3 exceeds 0.75 times the melt height of the molten material, the molten material rises over the current melt level and overflows. Thus, the molten material may flow to the outside of the container 1.
  • the molten material processing device described above is referred to as a molten material processing device according to a first embodiment.
  • a molten material processing device according to a second embodiment of the present invention will be described.
  • the molten material processing device according to the second embodiment of the present invention includes the components described in the molten material processing device according to the first embodiment, and further include a through-hole (not shown) to be formed in the dam 3.
  • the through-hole may be formed in a lower portion of the dam 3, defined in a direction from the one side toward the other side of the container 1, and have an inner wall directly connected to the bottom of the container 1.
  • the dam 3 is mounted within the container 1. Also, the mounting position thereof is set to be the edge portion of the drop area, and the top surface thereof is positioned in the upper portion of the molten material.
  • the inner profile of the container 1 is designed as described above, and the flow of the molten material is controlled. Thus, the upward flow may be generated from the drop area, and the flow of the molten material may be induced so that the dead volume within the container 1 is less than 10%. Through this, the inclusion removal efficiency may be improved by 50% or more when compared to the related art. In addition, manufacturing costs for refractories may be reduced due to the non-use of the weir, and manufacturing costs for molten steel may be reduced.
  • the dam structure of the molten material processing device according to the embodiments of the present invention described above may be referred to as, for example, a tundish dam structure having the dead volume of 10% or less for manufacturing ultra clean steel.
  • the molten material processing device may widely distribute the upward flow that reaches the top surface of the molten material while reducing the dead volume of the molten material to improve the inclusion removal capacity.
  • FIG. 1 is a view illustrating modeling structures for flow evaluation of molten material processing devices according to an embodiment of the present invention and comparative examples.
  • FIG. 2 is a view showing flow evaluation results of the molten material processing devices according to the embodiment of the present invention and the comparative examples.
  • FIG. 3 is a view showing quantitative numerical values of flow characteristics of the molten material derived from the flow evaluation results according to the embodiment of the present invention and the comparative examples.
  • the molten material processing device is a device for ultimately reducing an inclusion in a molten material according to shapes and design parameters of a dam in a continuous casting process.
  • various types of structures are constructed within a container 1, and then the flow characteristics are analyzed.
  • the inner shape within the container 1, for example, the shape and design parameters of a dam 3 are designed with an optimal profile.
  • a height of a top surface of a dam 3 is 2/3 of a melt height of a molten material, for example, 600 mm.
  • a modeling structure of a molten material processing device according to a comparative example 2 in which an impact pad 4 is mounted right below a molten material inlet part 2
  • a modeling structure of a molten material processing device according to a comparative example 3 in which an auxiliary dam 5 having a height of a top surface as low as 40 mm is mounted in a drop area, and a dam including a through-hole is mounted behind the auxiliary dam.
  • the dam including the through-hole is not mounted to directly face a molten material inlet part 2.
  • a top surface of the dam including the through-hole is 1/2 of a melt height of a molten material, for example, 450 mm, and the mounting position is outside a drop area.
  • the dam including the through-hole is designated by a reference numeral 3' to be distinguished from the dam 3 of the embodiment 1.
  • a modeling structure of a molten material processing device according to a comparative example 4 of the present invention Only an auxiliary dam 5 is mounted within a drop area.
  • a modeling structure of a molten material processing device according to a comparative example 5 of the present invention An auxiliary dam 5 is mounted away from a drop area and closer to a molten material outlet 1c than a molten material inlet part 2, for example, at a position where the distance from a center of the drop area is 1500 mm.
  • inner diameters of molten material inlets in the modeling structures of FIG. 1 are set to 160 mm.
  • the structure of the dam 3 of the molten material processing device has an optimized profile to increase a plug volume within the molten material and reduce a dead volume.
  • the inclusion removal capacity in the molten material may be evaluated through a residence time distribution graph.
  • FIG. 3 shows quantitative numerical values with which flow characteristics of the molten material may be analyzed through the residence time distribution graph for modeling shapes of the embodiment and the comparative examples shown in FIG. 1 .
  • a continuous casting apparatus for a numerical model experiment is configured, the numerical model experiment for a continuous casting process is performed, a certain amount of an experimental solution (a dye) is injected for 2 to 3 seconds, and the concentration of the solution is detected at the outlet over a time.
  • the results are plotted on a dimensionless time axis, and thus the residence time distribution curve is made.
  • the residence time distribution curve may be a standard concentration graph over a dimensionless time measured at an outlet when a dye is input to an inlet of the flow.
  • the curve may be derived using numerical analysis not the numerical model experiment. Using the residence time distribution curve, a mixing degree of the molten steel and an inclusion floating/separating effect, for example, according to changes in capacity and inner shape of the tundish may be determined.
  • a Min. Time is a time when the concentration of experimental solution is detected first.
  • a peak time is a time when the concentration of experimental solution is highest.
  • a mean time is a value obtained by dividing the inner volume of the container 1 by the input flow rate of the molten material int the molten material inlet part 2. The input flow rates of the molten material are equal to each other in the embodiment and comparative examples, but the inner volumes of the containers 1 are different from each other according to the inner profiles of the containers 1.
  • An active mean residence time is a value obtained by dividing an area of the curve by an average residence time when a dimensionless value of a measured average time is 2 or higher.
  • An active region fraction or an active volume fraction is a fraction of regions in which the molten steel is mixed, and includes a plug volume fraction and a mixed volume fraction.
  • a dead region fraction or a dead volume fraction is a fraction of regions in which the molten material very slowly flows for a time twice as long as the average residence time of the molten material within the container.
  • the molten steel volume within the tundish is divided into an active volume and a dead volume.
  • the active volume is a region in which the molten steel is mixed, but the dead volume is a region in which the mixing does not occur.
  • the active volume is divided into a plug volume and a mixed volume.
  • the plug volume the molten steel flows at a constant flow rate in a pipe flow, and mixing in the flow direction, that is, in the horizontal direction occurs over the entire regions without interlayer mixing.
  • the mixed volume is a region in which the mixing is highest, and mechanical agitation occurs.
  • the dead volume is referred to as a stagnation region, and is a region where a fluid moves very slowly within the container and stays for a time twice as long as the average residence time.
  • Vp is referred to as the plug volume fraction
  • Vd is referred to as the dead volume fraction
  • Vm the mixed volume fraction.
  • the peak time is related to the plug volume, and it may be confirmed that the highest value is shown in the embodiment. That is, embodiment 1 shows the best result.
  • Referring to a ratio of the dead volume it may be confirmed that embodiment 1 and comparative example 2 show a value of less than 10%. It may be confirmed that other comparative examples have greater than 10%.
  • the embodiment 1 with comparative example 1 it may be confirmed that there is an effect of reduction in dead volume of 4.7% to 5.8%.
  • the inclusion removal capacity there is an effect of the inclusion removal of 41% to 50%.
  • Embodiment 1 and comparative example 2 show the best results.
  • FIG. 4 is a view illustrating modeling structures for flow evaluation of molten material processing devices according to embodiments of the present invention and comparative examples.
  • FIG. 5 is a view showing quantitative numerical values of flow characteristics of the molten material derived from the flow evaluation results according to the embodiments of the present invention and the comparative examples.
  • FIG. 6 is a view showing flow evaluation results according to the embodiments of the present invention.
  • PI is a mounting position of the dam 3 according to embodiment 1
  • P2 is a position spaced L from PI in a rearward direction
  • P3 is a position spaced 2L from PI in the rearward direction.
  • L is set to 500 mm, and the flow evaluation was performed.
  • a position in FIG. 5 is a mounting position of the dam 3.
  • P1+P2 in comparative example 10 and comparative example 11 means that dams 3 are mounted at both PI position and P2 position. Similarly, others represent mounting positions.
  • a hole existence means that whether there is a through-hole or not.
  • embodiment 1 and embodiment 2 have very small values. That is, when the dam is constructed as in embodiment 1, and the through-hole is provided, it may be confirmed that the inclusion removal capacity is further improved. On the other hand, referring to comparative examples 6 to 17, it may be confirmed that, when a dam is mounted farther, or several dams are mounted in places in addition to the drop area, the inclusion removal capacity is adversely affected.
  • the distance between the center c of the drop area and the one width direction side wall 1a has to be greater than the distance between the center c of the drop area and the one surface of the dam 3 and smaller than the distance between the center c of the drop area and the other surface of the dam 3.
  • the width of the dam 3 in the one direction for example, the thickness has to be 50 mm to 200 mm.
  • the height of the top surface of the dam 3 has to be lager than 1/2 and smaller than 3/4 of the melt height of the molten material.
  • the distance between the one surface of the dam 3 and the molten material inlet part 2 may be in a range of 2.5 to 5 times the inner diameter of the molten material inlet part 2, and the height of the top surface of the dam 3 is in a range of 0.5 to 0.7 times the melt height of the molten material. Therefore, before turbulent flow energy of the molten material that flows in the pouring zone is dissipated, the turbulent flow of the molten material within the pouring zone is controlled using the dam 3. Accordingly, the molten material may overflow the upper portion of the dam 3, and the sufficient upward flow may be stably formed. Thus, the size of the dead volume of the molten material may be reduced to a half level when compared to the related art, and in the continuous casting process in which the molten material processing device is used, the inclusion removal capacity may be improved when compared to the related art.
  • the molten material processing device was used in the continuous casting process, and a continuous casting process for a plurality of charges was performed to cast slabs.
  • the cast slabs were sampled, and inclusions were inspected.
  • the total number of inclusions was reduced by approximately 40% on average compared to the related art, and the large scale inclusions having a size exceeding 20 ⁇ m were reduced by approximately 51% compared to the related art.
  • the inclusions having a size of 10 ⁇ m to 15 ⁇ m were reduced by approximately 35% compared to the related art, and the inclusions having a size of 15 ⁇ m to 20 ⁇ m were reduced by approximately 40% compared to the related art. That is, there is also an effect of reducing fine inclusions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP18888361.5A 2017-12-11 2018-12-07 Verarbeitungsvorrichtung für geschmolzenes material Withdrawn EP3725430A4 (de)

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PCT/KR2018/015563 WO2019117553A1 (ko) 2017-12-11 2018-12-07 용융물 처리 장치

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EP3725430A4 (de) 2020-12-30
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KR20190069093A (ko) 2019-06-19
KR102033642B1 (ko) 2019-11-08
WO2019117553A1 (ko) 2019-06-20

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