WO2017078336A1 - Appareil et procédé de traitement d'acier fondu - Google Patents

Appareil et procédé de traitement d'acier fondu Download PDF

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Publication number
WO2017078336A1
WO2017078336A1 PCT/KR2016/012307 KR2016012307W WO2017078336A1 WO 2017078336 A1 WO2017078336 A1 WO 2017078336A1 KR 2016012307 W KR2016012307 W KR 2016012307W WO 2017078336 A1 WO2017078336 A1 WO 2017078336A1
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WIPO (PCT)
Prior art keywords
molten steel
main body
supply
dam
zone
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PCT/KR2016/012307
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English (en)
Korean (ko)
Inventor
김성줄
Original Assignee
주식회사 포스코
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.)
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Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to CN201680063977.5A priority Critical patent/CN108348996B/zh
Priority to JP2018521579A priority patent/JP6608052B2/ja
Priority to EP16862352.8A priority patent/EP3372326B1/fr
Publication of WO2017078336A1 publication Critical patent/WO2017078336A1/fr

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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
    • 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 steel processing apparatus and method, and more particularly, to a molten steel processing apparatus and method that can control the level of the molten steel contained in the main body at the beginning, middle and end of the process for each region.
  • the inclusions can be separated from the molten steel in the tundish only while the molten steel level in the tundish is secured at a predetermined level.
  • Patent Document 1 KR10-2014-0085127 A
  • Patent Document 3 KR10-2013-0127247 A
  • Patent Document 4 KR10-2013-0047136 A
  • the present invention provides a molten steel processing apparatus and method that can control the level of molten steel contained in the interior of the main body for each region.
  • the present invention provides a molten steel treatment apparatus and method capable of locally raising the level of molten steel at the beginning, middle, and end of a process.
  • the present invention provides a molten steel processing apparatus and method capable of securing the amount of residual water in the vicinity of the tapping hole by moving the remaining molten steel to the tapping side in the middle and end of the process.
  • the present invention provides a molten steel treatment apparatus and method capable of reducing the inclusion index of cast steel produced at the beginning, middle and end of the process.
  • a molten steel processing apparatus the body is open to the upper side, the main body is formed with a tap hole in the bottom portion;
  • a fixed dam extending in the width direction of the main body and installed in contact with the bottom of the main body and both side walls in the longitudinal direction;
  • a control dam extending in the width direction of the main body; It includes; a drive unit for supporting the control dam rotatably and rotatably.
  • the control dam may have a width in the width direction so as to be spaced apart from both side walls in the longitudinal direction of the stopper at the installation position.
  • the control dam may have a width in the width direction so as to contact the bottom portion of the main body and both side walls in the longitudinal direction at the position where the fixed dam is installed.
  • the control dam may have a width in a width direction such that both edges in the width direction contact or overlap the stopper in a position where the stopper is installed.
  • Protruding portion is formed in the lower portion of the one side surface of the control dam, the projection portion having a loading surface on the upper; may further include a.
  • the stopper may extend in the height direction of the main body and protrude in the width direction.
  • the fixed dam may be spaced apart from each other in the longitudinal direction at the center of the main body so as to face each other, the discharge area is formed on the exit side with the fixed dam as the center, and the supply area may be formed on the opposite side of the exit port. .
  • the supply region may be provided with a plurality of the control dam and the stopper facing each other.
  • the molten steel treatment method is a method for treating steel, the interior of which is opened upwards, the tapping hole is formed in the bottom portion, a plurality of dams for dividing the interior into the supply area and the discharge area is provided Preparing a main body; Isolating the supply zone from the discharge zone using the plurality of dams; Supplying molten steel to the supply region; Connecting the supply zone and the discharge zone using the plurality of dams; And controlling the molten steel level of the discharge area by isolating the discharge area from the supply area by using the plurality of dams.
  • the controlling of the molten steel level of the discharge zone may include casting a cast steel to the remaining molten steel of the discharge zone isolated from the supply zone.
  • the controlling of the molten steel level of the discharge zone may include casting a slab to the remaining molten steel of the discharge zone isolated from the supply zone and supplying subsequent molten steel to the supply zone.
  • Supplying the subsequent molten steel to the discharge zone by connecting the supply zone and the discharge zone using the plurality of dams after supplying the subsequent molten steel to the supply zone; Controlling the molten steel level of the discharge area by isolating the discharge area from the supply area by using the plurality of dams; And casting the cast steel to the remaining molten steel in the discharge zone isolated from the supply zone.
  • the level of molten steel contained in the interior of the main body can be controlled for each region. It is also possible to locally increase the level of molten steel at the beginning, middle and end of the process. In other words, the molten steel level on the shroud nozzle side can be raised quickly at the beginning of the process to accelerate the introduction of flux, and the remaining molten steel is moved to the exit side at the middle and end of the process to reduce the amount of residual water near the exit. It can be secured.
  • the inside of the main body is divided into a supply zone and a discharge zone, and the supply zone is isolated from the discharge zone using a fixed dam and a control dam, or the molten steel of the supply zone is discharged.
  • the remaining molten steel can be moved, and the amount of residual water near the tap hole can be secured above the minimum amount of residual water.
  • FIG. 1 is a view showing a molten steel treatment apparatus according to an embodiment of the present invention.
  • FIG. 5 is a view for explaining the main part of the molten steel processing apparatus according to an embodiment of the present invention.
  • FIG. 6 is a view for explaining the operation of the molten steel treatment apparatus according to an embodiment of the present invention.
  • FIG. 8 is a graph for explaining the casting result of the continuous casting process to which the molten steel treatment method according to the embodiment and comparative example of the present invention is applied.
  • FIG. 1 is a schematic view of a molten steel processing apparatus according to an embodiment of the present invention
  • Figure 2 (a) is an enlarged schematic view of the main body of the molten steel processing apparatus according to an embodiment of the present invention
  • Figure 2 (b) is An enlarged plan view of a main body of a molten steel processing apparatus according to an embodiment of the present invention
  • 3 is an enlarged schematic view of a main body of a molten steel processing apparatus according to a modification of the present invention.
  • FIG. 5 (a) to 5 (c) are plan views showing the inside of the main body of the molten steel processing apparatus according to the embodiment of the present invention.
  • Figure 5 (a) is a plan view showing the main body in the position without the stopper
  • Figure 4 (b) is a plan view showing the main body in the position where the stopper is installed
  • Figure 4 (c) is controlled to the position where the stopper is installed It is a top view which shows the main body of the position in which the stopper was installed in the state which moved a dam.
  • the transport container 10 In the molten steel treatment apparatus according to the embodiment of the present invention, the transport container 10, the first nozzle 20, the main body 30, the second nozzle 40, the mold 50, the dam unit 60, the driving unit 70 ) And the controller 80.
  • This molten steel treatment device is a continuous casting process or two kinds of continuous casting of cast steel by supplying the subsequent molten steel having the same or different components as the previous molten steel into the interior of the main body 30 containing the molten steel while exchanging the transport container 10, for example It can be applied to various processes such as continuous casting process.
  • the transport container 10 may include a ladle.
  • the transport container 10 is, for example, a cylindrical container having an open side upward, and refractory is built therein so that the molten steel M can be contained therein.
  • the transport container 10 is provided to be movable above the main body 30 and serves to supply the molten steel M contained therein to the main body 20.
  • a collector nozzle (not shown) may be mounted to penetrate the lower side of the transport container 10, and the first nozzle 20 may be connected to the lower part of the collector nozzle.
  • the first nozzle 20 may include a shroud nozzle.
  • the first nozzle 20 is movably supported by a manipulator (not shown) provided at an outer side of the main body 30, and is coupled to the collector nozzle at the lower side of the transport container 10 to be connected to the transport container 10. have.
  • the body 30 may include a tundish.
  • the main body 30 is a container of a predetermined shape that receives molten steel M from the transport container 10 at the lower side of the transport container 10 and temporarily stores it, and forms an outer wall of the main body 30 to maintain the shape of the steel bar 31.
  • a refractory portion 32 that is built up inside the shell 31.
  • the main body 30 may be symmetrical with respect to the center of the longitudinal direction (x-axis direction), and the width in the longitudinal direction may be larger than the width in the width direction.
  • the main body 30 may have a shape in which the central portion in the longitudinal direction protrudes to one side in the width direction (y-axis direction).
  • the main body 30 may have a smaller width in the width direction from the central portion in the longitudinal direction toward both edge portions in the longitudinal direction. That is, the main body 30 may be narrower in width from the central portion to the end portion in the longitudinal direction.
  • the main body 30 may be opened at an upper side thereof, and a cover (not shown) may be mounted at an upper portion thereof.
  • An injection hole may be formed in the central portion of the cover, and the first nozzle 20 may be inserted into the injection hole and connected to the inside of the main body 30.
  • a tap hole 35 is formed in the bottom portion 33 of the main body 30, and is spaced apart from both sides of the longitudinal direction on the basis of the central portion of the main body 30 in the longitudinal direction (x-axis direction) and symmetrically plural. Each may be formed at the position of.
  • the second nozzle 40 may include a submerged entry nozzle.
  • the second nozzle 40 is a hollow tube through which the molten steel M passes.
  • the second nozzle 40 extends in the height direction (z-axis direction), opens up and down, and may be protected by a refractory.
  • the second nozzle 40 may be mounted to penetrate through the tap hole 35 from the lower side of the main body 30 to supply the molten steel M contained in the main body 30 to the mold 50.
  • One side of the second nozzle 40 may be provided with a gate of a slide structure (not shown), the gate can adjust the amount of exit of the molten steel (M) by adjusting the opening degree of the second nozzle (40).
  • the mold 50 is spaced apart in the longitudinal direction (x-axis direction) and a pair of first plates facing each other and spaced in the width direction (y-axis direction) to connect both edges of the first plate at positions facing each other, respectively It may be a rectangular or square hollow block in which side surfaces are formed by a pair of second plates, and upper and lower portions are opened to form a space in which molten steel M is first solidified.
  • the mold 50 is positioned to surround the lower part of the second nozzle 40, and receives molten steel M from the main body 30 to solidify the cast steel and draw continuously.
  • a cooling stand (not shown) may be provided below the mold 50.
  • the cooling stand cools the slab drawn from the mold 50 and performs a series of molding operations.
  • the cooling stand is provided with a plurality of segments, and the plurality of segments are continuously arranged in a predetermined direction to form a cooling stand of a curved type or a vertical curved type.
  • Each segment is provided with a plurality of rolls to guide the drawing of the cast steel.
  • a nozzle is provided between each roll, and a nozzle injects coolant into a cast steel, and secondary-cools a cast steel.
  • the dam unit 60 may be installed in the main body 30 to control the flow of the steel, for example, molten steel M, contained in the main body 30.
  • the dam unit 60 may be provided on both left and right sides with respect to the center of the longitudinal direction (x-axis direction) of the main body 30 and may have a symmetrical shape and structure.
  • the fixed dam 61 is a dam made of refractory, and may be formed in the shape of a plate extending in the width direction of the main body 30 and having a predetermined thickness in the longitudinal direction and a predetermined area in the width direction and the height direction. 64 may be spaced apart from the tap hole 35 toward the lower portion of the main body 30.
  • the fixed dam 61 may upwardly flow the molten steel M guided into the lower side of the main body 30 by the control dam 63.
  • the upper end of the fixed dam 61 may have a predetermined height from the bottom portion 33 of the main body 30 so that the upward flow of the molten steel M is easy and the flow rate of the molten steel M may be formed at a desired flow rate.
  • the fixed dam 61 as the height increases, the rising flow of the molten steel M is relatively suppressed, and as the height decreases, the flow velocity of the molten steel M is relatively increased.
  • the fixed dam 61 may be provided in plural, for example, two so as to face each other spaced apart from each other in the longitudinal direction at the center of the main body 30, the installation structure of the fixed dam 61 such as the supply area (A) and the discharge area
  • the installation structure that partitions (B) the inside of the main body 30 can be divided into a supply region (A) and a discharge region (B).
  • the supply region (A) may be formed inside the fixed dam (61), and the discharge region (B) may be formed outside.
  • the inner side of the fixed dam 61 in which the supply region A is formed may be an area opposite to the tap hole 35 with the fixed dam 61 as the center.
  • the outer side of the fixed dam 61 in which the discharge area B is formed may be an area on the exit hole 35 side with the fixed dam 61 as the center.
  • Residual hole 62 is formed to penetrate the lower portion of the fixed dam 61 in the longitudinal direction, the inside thereof may be connected to the bottom portion 33 of the main body 30.
  • the molten steel M in the lower side of the main body 30 may be moved from the supply region A to the discharge region B side through the residing hole 62.
  • the control dam 63 is a dam made of refractory, and may be formed in the shape of a plate extending in the width direction of the main body 30 and having a thickness in the longitudinal direction and a width in the width direction and the height direction.
  • the control dam 63 is disposed in the supply region A of the main body 30 and is supported by the driving unit 70 and can be moved in the longitudinal direction, the width direction, and the height direction, respectively, and is rotated about the axis in the height direction. Can be.
  • the control dam 63 has both longitudinal sidewalls 34b of the main body 30 in order to prevent structural interference with the main body 30 during movement and rotation in the position where the stopper 64 is installed or in the supply area A.
  • FIG. A width in the width direction is formed so as to be spaced apart from the width), but in the position where the fixed dam 61 is installed, the width in the width direction is formed so as to contact both the bottom portion 33 of the main body 30 and both side walls 34b in the longitudinal direction. Can be.
  • control dam 63 can be freely moved and rotated in the supply region A of the main body 30 without colliding with the main body 30, and the installation position of the fixed dam 61 on the supply region A side.
  • the fixed dam 61 and the bottom 33 of the main body 30 and both side walls 34b in the longitudinal direction may be in close contact with each other to isolate the supply area A from the discharge area B.
  • control dam 63 has a width in the width direction so as to be spaced apart from both side walls 34b in the longitudinal direction of the main body 30, and both edges in the width direction at the stopper 64 are installed at the stopper 64.
  • the width in the width direction may be formed to contact or overlap.
  • the control dam 63 moves from the upper side of the main body 30 to the position where the stopper 64 is installed, and both edges of the width direction are in close contact with the stopper 64, the upper end thereof is formed of the molten steel M.
  • the width in the height direction may be formed so as to be positioned higher than the bath surface and spaced apart from the bottom portion 33 of the main body 30.
  • control dam 63 is in close contact with the stopper 64, for example, serves as a weir and falls down to the main body 30 to flow the molten steel M guided to the discharge area B side. It can be guided to the inner lower side of the main body 30 to reduce the strength of the initial flow of the molten steel (M) to the desired strength.
  • the stoppers 64 are respectively installed on both of the longitudinal side walls 34b of the main body 30 at positions spaced apart from the fixed dam 61 to the longitudinal center side of the main body 30, and extend in the height direction of the main body 30. It may protrude in the width direction.
  • the stopper 64 serves to seal between the control dam 63 and both longitudinal sidewalls 34b of the main body 30 when the control dam 63 is moved to and close to the position where the stopper 64 is installed.
  • the stopper 64 may be made of refractory material.
  • the protruding length in the width direction of the stopper 64 may be formed corresponding to the width in the width direction of the control dam 63, and is spaced between the control dam 63 and both side walls 34b in the longitudinal direction of the main body 30. It may be equal to the interval or greater than the separation interval.
  • the position of the stopper 64 in the longitudinal direction of the main body 30 can maximize the ability to remove inclusions from the molten steel while the molten steel is supplied in a steady state while the control dam 63 is in close contact with the stopper 64. Can be selected as the location.
  • the driving unit 70 may be, for example, a mechanical or hydraulic driving device provided at an external predetermined position of the main body 30.
  • the driving unit 70 may be formed to support the control dam 63 so as to move and rotate. More specifically, the driving unit 70 may be formed to support the control dam 63 so as to be movable along the longitudinal direction of the main body 30.
  • the control dam 63 may be formed to be tiltable or rotatable about an axis in the height direction.
  • the above-described tilting controls the angle of the control dam 63 with respect to the axis in the height direction, but the control dam 63 has a small angle such that the control dam 63 can pass between the stoppers 64. It means to control the attitude of the control dam 63 while changing the angle.
  • the above-described rotation controls the angle of the control dam 63 with respect to the axis in the height direction, but at a relatively large angle rather than a small angle such that the control dam 63 can pass between the stoppers 64. This means controlling the angle of the dam 63 and controlling the attitude of the control dam 63.
  • the driving unit 70 extends in the height direction and is mounted on the upper end of the control dam 63 so as to be aligned with the central portion in the width direction of the control dam 63 at an upper side of the control dam 63.
  • the second driving rod 72 is mounted to one side end of the width direction to be movable in the height direction, the second driving rod 72 is formed to be movable in the longitudinal direction and the second driving rod 72 It may include a third drive rod (73) mounted to the other end of the fourth drive rod (74) connected to the third drive rod (73) to support the movement in the longitudinal direction.
  • the drive unit 70 may be formed in a variety of configurations and methods that can support the control dam 63 to be rotatable and rotatable, and is not particularly limited to the above-described configuration and manner.
  • the control unit 80 may be formed to control the operation of the driving unit 70 in response to the input process pattern.
  • the controller 80 moves the control dam 63 in the longitudinal direction and the height direction of the main body 30 and rotates about an axis in the height direction to fix the fixed dam 61 in the supply region A of the main body 30. ), Or in close contact with the stopper 64, or move from the stopper 64 to the central portion in the longitudinal direction of the main body 30.
  • This operation can be controlled differently for each detailed process of the process.
  • the interior of the main body 30 can be divided into a supply area A and a discharge area B, and isolated from each other, and the molten steel M water surface slag of the supply area A is separated from the main body.
  • the molten steel in the supply region A of the main body 30 can be pushed out to the discharge region B side by moving to the center side of the center 30.
  • the molten steel processing apparatus which concerns on the modified example of this invention with reference to FIG. 1 and FIG. Since the molten steel processing apparatus according to the modified example of the present invention has a similar configuration to the molten steel processing apparatus according to the embodiment of the present invention described above, the description of the components overlapping with the molten steel processing apparatus according to the embodiment of the present invention described above will be omitted. It will be described below with a focus on the configuration parts that are different from the embodiment of the present invention.
  • the dam unit 60 ′ of the molten steel treatment apparatus extends in the width direction of the main body 30 and is spaced apart from the central portion in the longitudinal direction of the main body 30 toward the tap hole 35.
  • the fixed dam 61 which is installed in contact with the bottom 33 of the 30 and both side walls 34b in the longitudinal direction, the residing hole 62 formed through the lower portion of the fixed dam 61 in the longitudinal direction, the main body Stoppers 64 respectively provided on the longitudinal side walls 34b of the main body 30 on opposite sides of the tapping hole 35 around the control dam 63 and the fixed dam 63 extending in the width direction of the 30.
  • the protruding portion 65 may protrude from the lower side of one side of the control dam 63, but may protrude from the central portion in the width direction of the lower side of the one side of the control dam 63.
  • the protruding portion 65 extends in the width direction and the longitudinal direction and has an upper surface intersecting with one side of the control dam 63, and extends inclined downward from one side in the width direction of the upper surface to the lower side of the control dam 63. It may have a shape of a block having an inclined surface connected to the end portion and a vertical surface extending vertically from both sides in the longitudinal direction of the upper surface to be connected to the upper surface and the end portion in the width direction of the inclined surface.
  • the protruding portion 65 can remove and remove a certain amount of slag or flux formed on the hot water surface of the molten steel M using the upper surface.
  • the protrusion 65 may have a top surface formed in a plane to serve as a loading surface, and in this case, slag or flux may be removed from molten steel by stacking at least one of slag and flux on the loading surface. have.
  • the protrusion 65 may have an upper surface open upward and a loading space formed therein. In this case, at least one of slag and flux may be accommodated in the internal loading space of the protrusion 65 through the open upper surface. In this way, slag or flux can be removed from the molten steel.
  • the control dam 63 is brought into close contact with the fixed dam 61 to supply the area A of the main body 30. Is isolated from the discharge zone (B). Thereafter, molten steel (M) is injected into the body 30. In this case, the molten steel M may be injected only into the supply region A of the main body 30, thereby rapidly increasing the molten steel level. Subsequently, when the molten steel level of the main body 30 becomes higher than the end level of the first nozzle 20 and the end of the first nozzle 20 is immersed in the molten steel M, the flux F into the main body 30. ) Is quickly added and applied to the hot water surface, whereby molten steel M can be prevented from being reoxidized quickly.
  • control dam 63 may be in close contact with the stopper 64 at the side of the second nozzle 40 based on the stopper 64 or may be in close contact with the stopper 64 at the first nozzle 20 side. .
  • control dam 63 Before the control dam 63 is moved to the stopper 64 and in close contact with the control dam 63, the control dam 63 and the main body ( It is possible to more smoothly move the molten steel (M) and the flux (F) by adjusting the size of the separation space formed between both longitudinal sidewalls (34b) of 30).
  • the molten steel M supplied to the discharge area B reaches a predetermined level
  • casting is started. While casting is performed to the molten steel M of the discharge zone B connected to the supply zone A, as shown in FIG. 6C, the molten steel of the main body 30 is maintained at a working level. Can be.
  • the control dam 63 serves as a weir, for example, in the upper region of the main body 30, and induces the molten steel M to the lower side of the main body 30 while desired the flow strength of the molten steel M. Control by strength.
  • the control dam 63 is connected to the first nozzle 20. To the side. At this time, the control dam 63 may be moved in such a manner as to pass between the stoppers 64 in a state where the control dam 63 is tilted or rotated about an axis in the height direction. In this manner, the control dam 63 can easily move between the stoppers 64 without moving through the stopper 64 within the main body 30.
  • the slag or flux formed on the molten steel M surface can be moved toward the central side of the main body 30, and in response thereto, the molten steel in a relatively clean state located under the main body 30 is discharged. ) Can be moved to the side. At this time, the slag and flux moved to the center side of the main body 30 may be loaded on the upper surface of the protrusion 65 protruding on one side of the control dam 63 may be removed from the molten steel (M).
  • the fixed dam 63 is fixed. And the molten steel in the supply zone A can be moved to the discharge zone B. Then, the control dam 63 is brought into close contact with the fixed dam 61, and the molten steel level is increased.
  • the discharge zone B can be isolated from the supply zone A. As a result, the molten steel level h B on the discharge region B side can be higher than the molten steel level h A on the supply region A side. Thereafter, the casting is performed to the remaining molten steel in the discharge zone B isolated from the supply zone A.
  • the height of the remaining molten steel near the exit port can be ensured to be higher than the height at which slag is prevented from entering. This can improve the quality of the cast steel produced in the middle and end of the process.
  • 7 (a) to 7 (d) are process drawings showing the operation of the molten steel treatment apparatus according to the comparative example of the present invention. 6 and 7, the operation of the molten steel treatment apparatus according to the comparative example of the present invention will be described in comparison with the operation of the molten steel treatment apparatus according to the embodiment of the present invention.
  • a molten steel treatment apparatus includes a lower dam 91 and an upper dam 92 inside the main body 30.
  • the upper dam 92 is fixedly installed above the inside of the main body 30 at a position spaced apart from the first nozzle 20 to the second nozzle 40 side.
  • the lower dam 91 is fixed to the inner lower side of the main body 30.
  • the continuous casting process of finishing the process with the remaining molten steel from the beginning of the continuous casting process in which the molten steel begins to be supplied into the main body 30
  • the molten steel level of the main body 30 is the same throughout the entire area of the main body 30 until the end (see Figs. 7 (c) and 7 (d)), in particular, at the end of the process, on the first nozzle 20 side.
  • the molten steel level h ' A and the molten steel level h' B on the second nozzle 40 side are formed at the same height.
  • the molten steel level on the first nozzle 20 side and the molten steel level on the second nozzle 40 side cannot be locally adjusted, and in particular, the remaining molten steel height near the tap hole is separately adjusted. Can't.
  • the flow and molten steel levels at the beginning and end of the continuous casting process cannot be controlled in a desired manner. That is, since molten steel is taken in the entire interior of the main body 30 at the time of opening of the first nozzle 20, the rise of the molten steel is delayed compared to the case of the embodiment of the present invention, and thus the flux injection is delayed. It is not possible to quickly suppress or prevent the reoxidation of molten steel due to the contact of.
  • the molten steel level is lowered over the entire interior of the main body 30, so that it is relatively difficult to maintain the minimum residual amount of water, and as a result, the error rate of the molten steel is lowered.
  • the present invention as described above, it is possible to control the molten steel level differently for each of the supply region (A) and the discharge region (B) of the main body 30, it is possible to advance the flux input timing at the beginning of the process In the middle and end of the process, the amount of residual water in the vicinity of the exit can be ensured to be equal to or greater than the minimum residual water amount, thereby securing the quality and error rate of the cast steel.
  • the inclusion index of FIG. 8 means the oxygen content included in the manufactured cast steel, prepare a cast steel cast at the initial charge (Charge, Ch) of molten steel at the beginning of the continuous casting process, for example by The result is obtained by quantifying the oxygen content of the specimen.
  • the method of deriving the inclusion index by analyzing the oxygen content in the cast steel is a well-known technique, and thus a detailed description thereof will be omitted.
  • the inclusion index of the cast steel produced in the continuous casting process of the molten steel processing apparatus according to an embodiment of the present invention than the inclusion index of the cast steel produced in the continuous casting process of the molten steel processing apparatus according to the comparative example of the present invention.
  • the flux injection timing is also slow, and thus, the reoxidation of the molten steel is rapidly performed differently from the embodiment of the present invention. Because it can not be suppressed.
  • the injection space of the initial molten steel can be reduced by using the control dam 63, and thus, the molten steel level can be reached at the lower end of the first nozzle 20 in a smaller amount than in the prior art.
  • the flux F is uniformly applied to the hot water surface of the molten steel, thereby quickly preventing the molten steel from reoxidation.
  • the initial application area of the flux (F) can be smaller than the conventional one, the molten steel bath surface can be protected at a faster time.
  • the control dam 63 is raised and moved to release the close contact with the fixed dam 61, thereby connecting the supply region A and the discharge region B. . Thereafter, the control dam 63 is brought into close contact with the stopper 64 to guide the flow of molten steel to the lower side of the main body 30, and when the molten steel supplied to the discharge zone B reaches a predetermined level, the supply zone A Casting of the cast steel with the molten steel in the discharge zone (B) connected with the.
  • the molten steel level of the main body 30 is lowered.
  • the control dam 63 is moved to the first nozzle 20 side to move the slag to the longitudinal center portion of the main body 30, and the molten steel in the clean state under the main body 30 to the discharge area B side. Move it.
  • the slag collected at the center of the main body 30 may be removed from the molten steel by removing the slag from the molten steel by loading the slag on the upper portion of the protrusion 65 formed at the lower portion of the control dam 63.
  • the slag is moved to the exit side of the main body 30 can be effectively suppressed or prevented from flowing into the exit.
  • the molten steel level of the main body 30 is further lowered so that the remaining molten steel in the main body 30 reaches the minimum residual amount.
  • the control dam 63 is moved to the fixed dam 61 and the molten steel of the supply area A is moved to the discharge area B to increase the molten steel level of the discharge area B.
  • the control dam 63 is brought into close contact with the fixed dam 61 to isolate the discharge area B from the supply area in the state where the molten steel level is increased.
  • the molten steel treatment method according to a modified example of the present invention is a molten steel treatment method applicable to, for example, a soft casting process or a continuous casting process of two kinds of steel, the inside of which is opened upwards, a tap hole is formed in the bottom, Providing a main body having a plurality of dams divided into the discharge area, isolating the supply area from the discharge area by using the plurality of dams, supplying molten steel to the supply area, supplying the supply area using a plurality of dams Connecting the discharge zone, and separating the discharge zone from the supply zone using a plurality of dams and controlling the molten steel level of the discharge zone.
  • the transport container 10 is positioned above the supply area A of the main body 30, and molten steel is supplied into the supply area A of the main body 30.
  • the molten steel M can be supplied only to the supply region A, so that the molten steel level can be raised quickly.
  • the injection space of the initial molten steel can be reduced by using the control dam 63, and thus, the molten steel level can be reached at the lower end of the first nozzle 20 in a smaller amount than in the prior art.
  • the flux F is uniformly applied to the hot water surface of the molten steel, thereby quickly preventing the molten steel from reoxidation.
  • the initial application area of the flux (F) can be smaller than the conventional one, the molten steel bath surface can be protected at a faster time.
  • the molten steel level of the main body 30 is lowered.
  • the control dam 63 is moved to the first nozzle 20 side to move the slag to the longitudinal center portion of the main body 30, and the molten steel in the clean state under the main body 30 to the discharge area B side. Move it.
  • the slag collected at the center of the main body 30 may be removed from the molten steel by removing the slag from the molten steel by loading the slag on the upper portion of the protrusion 65 formed at the lower portion of the control dam 63.
  • the slag is moved to the exit side of the main body 30 can be effectively suppressed or prevented from flowing into the exit.
  • the molten steel level of the main body 30 is further lowered so that the remaining molten steel in the main body 30 reaches the minimum residual amount.
  • the control dam 63 is moved to the fixed dam 61 and the molten steel of the supply area A is moved to the discharge area B to increase the molten steel level of the discharge area B.
  • the control dam 63 is brought into close contact with the fixed dam 61 to isolate the discharge area B from the supply area in the state where the molten steel level is increased.
  • the subsequent molten steel may be a molten steel of the same component as the previous molten steel remaining in the discharge zone (B), or may be a molten steel of a different kind of steel different from the previous molten steel remaining in the discharge zone (B).
  • the control dam 63 is raised and moved to release the close contact with the fixed dam 61, thereby supplying the supply region A. And discharge zone (B). Accordingly, the subsequent molten steel contained in the supply zone A may be supplied to the discharge zone B.
  • the control dam 63 is brought into close contact with the stopper 64 to induce the flow of molten steel to the lower side of the main body 30 and continuously cast the cast steel into the molten steel of the discharge zone B connected to the supply zone A. Do it.
  • the molten steel level of the body 30 is lowered as the casting proceeds.
  • the control dam 63 is moved to the first nozzle 20 side to move the slag to the longitudinal center portion of the main body 30, and the molten steel in the clean state under the main body 30 to the discharge area B side. Move it.
  • the slag collected at the center of the main body 30 may be removed from the molten steel by removing the slag from the molten steel by loading the slag on the upper portion of the protrusion 65 formed at the lower portion of the control dam 63.
  • the slag is moved to the exit side of the main body 30 can be effectively suppressed or prevented from flowing into the exit.
  • the molten steel level of the main body 30 is further lowered so that the remaining molten steel in the main body 30 reaches the minimum residual amount.
  • the control dam 63 is moved to the fixed dam 61 in a state where the control dam 63 is lowered to a predetermined height, and the molten steel of the supply area A is moved to the discharge area B side to the subsequent molten steel of the discharge area B.
  • the control dam 63 is brought into close contact with the fixed dam 61 to isolate the discharge area B from the supply area while the molten steel level is increased.
  • the remaining molten steel in the discharge zone B isolated from the supply zone A is continuously supplied to the mold and cast into a cast steel, and the molten steel level of the subsequent molten steel remaining in the discharge zone B is the lowest residual amount. When the level is reached, the continuous casting process is completed.
  • the molten steel level can be locally increased to prevent the inflow of slag by the vortex formed near the exit at the end of the process, and the minimum amount of residual steel remaining in the body at the end of the continuous casting process is reduced. Can be. In the case of two steel continuous casting processes, it is possible to reduce the mixing portion.
  • the quality of the cast can be secured at the beginning and the end of the continuous casting process while the continuous casting process is performed smoothly, and the error rate can be secured.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

La présente invention concerne un appareil de traitement d'acier fondu et un procédé de traitement d'acier fondu appliqué à celui-ci, ledit appareil comprenant : un corps principal dont l'intérieur est ouvert vers le haut, et présentant un trou de coulée d'acier formé sur sa partie inférieure ; un barrage fixe s'étendant dans le sens de la largeur du corps principal et destiné à entrer en contact avec la partie inférieure et les deux parois latérales longitudinales du corps principal ; un barrage de commande s'étendant dans le sens de la largeur du corps principal et conçu pour être espacé de la partie inférieure et des deux parois latérales longitudinales du corps principal ; et une partie d'entraînement pour permettre le support mobile et rotatif du barrage de commande. L'appareil et le procédé de traitement d'acier fondu selon l'invention permettent de réguler le niveau d'acier fondu, présent à l'intérieur du corps principal, selon chaque section dans l'étape initiale, l'étape médiane et l'étape finale d'un processus.
PCT/KR2016/012307 2015-11-02 2016-10-28 Appareil et procédé de traitement d'acier fondu WO2017078336A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201680063977.5A CN108348996B (zh) 2015-11-02 2016-10-28 钢水处理设备和钢水处理方法
JP2018521579A JP6608052B2 (ja) 2015-11-02 2016-10-28 溶鋼処理装置及び方法
EP16862352.8A EP3372326B1 (fr) 2015-11-02 2016-10-28 Appareil et procédé de traitement d'acier fondu

Applications Claiming Priority (2)

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KR1020150153386A KR101779153B1 (ko) 2015-11-02 2015-11-02 용강 처리 장치 및 방법
KR10-2015-0153386 2015-11-02

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KR (1) KR101779153B1 (fr)
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KR102033629B1 (ko) * 2017-12-05 2019-10-17 주식회사 포스코 연속주조 방법 및 장치
KR102108162B1 (ko) * 2018-07-04 2020-05-08 주식회사 포스코 연속주조용 턴디쉬
US20240131577A1 (en) * 2019-10-17 2024-04-25 Pyrotek, Inc Sensor controlled launder flow

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JP2013086147A (ja) * 2011-10-20 2013-05-13 Jfe Steel Corp 連続鋳造による高清浄度鋼鋳片の製造方法
JP2014087835A (ja) * 2012-10-31 2014-05-15 Kobe Steel Ltd 連続鋳造方法
KR20140145382A (ko) * 2013-06-13 2014-12-23 주식회사 포스코 용탕 처리 장치
KR20150073448A (ko) * 2013-12-23 2015-07-01 주식회사 포스코 용강 처리 장치 및 용강 처리 방법

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EP3372326B1 (fr) 2020-04-15
KR20170051051A (ko) 2017-05-11
EP3372326A1 (fr) 2018-09-12
JP6608052B2 (ja) 2019-11-20
CN108348996B (zh) 2020-06-12
CN108348996A (zh) 2018-07-31
JP2018535834A (ja) 2018-12-06
KR101779153B1 (ko) 2017-09-18
EP3372326A4 (fr) 2018-09-12

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