WO2020085772A1 - Installation de coulage et procédé de coulage - Google Patents

Installation de coulage et procédé de coulage Download PDF

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Publication number
WO2020085772A1
WO2020085772A1 PCT/KR2019/013908 KR2019013908W WO2020085772A1 WO 2020085772 A1 WO2020085772 A1 WO 2020085772A1 KR 2019013908 W KR2019013908 W KR 2019013908W WO 2020085772 A1 WO2020085772 A1 WO 2020085772A1
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WIPO (PCT)
Prior art keywords
molten steel
room
tundish
casting
mold
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.)
Ceased
Application number
PCT/KR2019/013908
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English (en)
Korean (ko)
Inventor
정태인
박준표
김성줄
김성연
최주
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
Priority to CN201980080618.4A priority Critical patent/CN113165056B/zh
Priority to JP2021523063A priority patent/JP7148724B2/ja
Priority to EP19875171.1A priority patent/EP3871802A4/fr
Publication of WO2020085772A1 publication Critical patent/WO2020085772A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • 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
    • B22D11/007—Continuous casting of metals, i.e. casting in indefinite lengths of composite ingots, i.e. two or more molten metals of different compositions being used to integrally cast the ingots
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0406—Moulds with special profile
    • 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
    • B22D11/108—Feeding additives, powders, or the like
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • 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
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring

Definitions

  • the present invention relates to a casting equipment and a casting method, and more particularly, to a casting equipment and a casting method capable of casting a double-layer cast.
  • a casting device for manufacturing a double-layer cast iron having a different composition from the surface layer and a center is a mold that receives molten steel from a tundish and tundish, which are molten steels of different compositions, and initially solidifies the molten steel into a predetermined shape.
  • a beam is provided in the tundish to divide the inner space into two spaces based on the beam, that is, the first space and the second space.
  • the bore provided inside the tundish is provided with a shorter length than the height of the tundish, and the lower end is installed to be separated from the bottom surface in the tundish. Therefore, even if the interior space of the tundish is divided through the beam, since the bottom surface of the tundish is spaced apart, mixing between the first molten steel and the second molten steel cannot be completely prevented.
  • the amount of molten steel in the tundish decreases at the time the ladle is replaced, so that vortices are generated in the lower part of the tundish, so that mixing cannot be avoided further. Therefore, a cast with non-uniform components is produced in the longitudinal direction of the cast by mixing the first molten steel and the second molten steel.
  • the Ar gas is bubbled to the bottom surface of the tundish, but the residence time of the molten steel in the tundish is short, and according to this method, a cast piece having an uneven component in the longitudinal direction is produced.
  • the casting equipment as described above has a structure in which one mold and one secondary cooling zone are provided on the lower side of the tundish, that is, only one strand, and thus has a disadvantage in that the production rate of the multi-layer cast iron is low.
  • Patent Document 1 Korean Open Patent KR 2012-0071475
  • the present invention provides a casting equipment and a casting method that can improve the production rate of a multi-layer cast.
  • the present invention provides a casting equipment and a casting method capable of casting a multi-layer cast iron having a desired function.
  • Casting equipment includes a ladle having a first room and a second room capable of receiving molten steel in each; A tundish provided with a first accommodating space accommodating the first molten steel provided from the first room and a second accommodating space accommodating the second molten steel provided from the second room; And a mold located on the lower side of the tundish to solidify the first molten steel and the second molten steel provided from the tundish, thereby casting a multi-layer cast with different components of the surface layer and the inner layer.
  • the ladle the body having an interior space; And a dividing member installed inside the body such that the first room and the second room are formed by dividing the inner space of the body, and the bottom surface of the dividing member is installed to be connected to the bottom surface of the body. do.
  • the first plug is provided to penetrate the bottom of the first room in the vertical direction, so that the intake of the inert gas into the first room;
  • a second plug provided to penetrate the bottom of the second room in the vertical direction so that inert gas can be blown into the second room;
  • a first discharge nozzle provided to penetrate the bottom of the first room in the vertical direction to discharge the first molten steel; It includes; a second discharge nozzle provided to penetrate the bottom of the second room in the vertical direction, so that the discharge of the second molten steel.
  • the tundish the main body having an interior space; And a partition wall portion installed inside the main body such that the first accommodating space is an outer space and the second accommodating space is an inner space in the main body.
  • the lower end of the partition is connected to the bottom of the body.
  • the main body may include a first body formed extending in a first extending direction; And a second body extending from the first body in a second extending direction intersecting the first extending direction, wherein the partition wall portion is formed to extend in the extending direction of the first body, A first partition wall accommodated therein; And a second partition wall extending in a direction intersecting with the extending direction of the first partition wall, wherein at least a portion of the second partition wall is accommodated in the second body.
  • the mold is located below the first body and the first partition of the tundish, and the ladle is located above the second body and the second partition of the tundish.
  • the mold is provided in plural, and the plurality of molds are arranged in the first extension direction from the bottom of the tundish so that the first molten steel and the second molten steel can be provided from the tundish.
  • a plurality of upper immersion nozzles supplying the first molten steel of the tundish to each of the plurality of molds; And a plurality of lower immersion nozzles supplying the second molten steel of the tundish to each of the plurality of molds.
  • the casting device includes a magnetic field generator that applies a magnetic field into the mold.
  • the present invention is a casting method for producing a multi-layer cast iron having different components of the surface layer and the inner layer, the process of supplying the first molten steel accommodated in the first room of the ladle to the first receiving space of the tundish; Supplying a second molten steel accommodated in a second room inside the ladle that is isolated from the first room to a second accommodation space of the tundish; And supplying the first and second molten steel of the tundish as a mold, and casting the cast.
  • Providing a first molten steel in the first room of the ladle, providing a second molten steel in the second room, providing a first molten steel in the first room, and second molten steel in the second room The process of providing a process of adding an additive to the first room; And charging molten steel having the same component composition in each of the first room and the second room.
  • the magnetic flux density is adjusted to form a concentration gradient in which the concentration of the additive component included in the additive decreases from the surface inward.
  • a magnetic field is applied so that the magnetic flux density in the mold is 0.2 Tesla to 0.8 Tesla.
  • the additive includes alloy iron containing at least one additive component of Cr, C, Si, Mn, Ni, and Al.
  • the multi-layer cast according to the embodiment of the present invention may have a concentration gradient layer having a concentration gradient for the additive component from the surface to the inside direction.
  • the thickness of the concentration gradient layer is 1.4% to 8.5% of the total thickness of the cast steel.
  • the equipment is configured to have a plurality of strands, it is possible to improve the production rate of the multi-layer cast iron.
  • first molten steel and the second molten steel are provided separately from the ladle, and by supplying them in a tundish, a multi-layer cast with uniform components in the longitudinal direction of the cast can be cast.
  • FIG. 1 is a view showing a casting equipment according to an embodiment of the present invention
  • FIG. 2 is a three-dimensional view for explaining the ladle and tundish in the casting equipment according to the embodiment of the present invention
  • FIG. 3 is a view showing a ladle according to an embodiment of the present invention
  • FIG. 4 is a top view showing a tundish according to an embodiment of the present invention
  • FIG. 5 is a conceptual diagram for explaining a concentration gradient in a multi-layer cast cast by a method according to an embodiment of the present invention
  • FIG. 7 is a flow chart sequentially showing a method for casting a multi-layer cast iron according to an embodiment of the present invention
  • the present invention relates to a casting equipment and a casting method capable of casting a multi-layer cast. More specifically, the present invention provides a casting facility and a casting method that can improve the production rate of a multi-layered cast and have a desired function.
  • FIG. 1 is a view showing a casting equipment according to an embodiment of the present invention.
  • 2 is a three-dimensional view for explaining the ladle and tundish in the casting equipment according to the embodiment of the present invention.
  • 3 is a view showing a ladle according to an embodiment of the present invention.
  • 4 is a top view showing a tundish according to an embodiment of the present invention.
  • 5 is a conceptual diagram for explaining a concentration gradient in a multi-layer cast cast by a method according to an embodiment of the present invention.
  • (b) is a graph conceptually showing the concentration of added components on a straight line connecting A-A 'in FIG. 5 (a).
  • 6 is a graph showing the thickness of the concentration gradient region according to the magnetic flux density intensity.
  • the casting equipment is a ladle (100), the first room (130a) and the second room (130b) that is capable of accommodating molten steel is dividedly provided inside, the first A tundish 300 having a first accommodation space 330a and a second accommodation space 330b that are divided and provided to accommodate the molten steel provided from each of the rooms 130a and the second rooms 130b, each turn The molten steel is provided from the first accommodating space 330a and the second accommodating space 330b of the dish 300, and solidified therein to provide molds 410a, 410b for casting a double-layer cast, and the length of the tundish 300 And first and second casting devices 400a and 400b arranged in the direction (X-axis direction).
  • the casting equipment is a first supply nozzle (200a) for supplying the molten steel of the first room (130a) of the ladle 100 to the first receiving space (330a) of the tundish (300), It includes a second supply nozzle (200b) for supplying the molten steel of the second room (130b) to the second receiving space (330b) of the tundish.
  • the molten steel accommodated in the first accommodation space 330a of the first room 130a of the ladle 100 and the tundish 300 is referred to as the first molten steel M1, and the ladle 100 ),
  • the molten steel accommodated in the second accommodation space 330b of the second room 130b and the tundish 300 is referred to as the second molten steel M2.
  • the ladle 100 is a body 110 having an interior space capable of receiving molten steel, and is installed inside the body 110 to turn the interior space of the body 110 into a tundish 300. It is provided to penetrate the bottom of the body 110 corresponding to the first member 130a, the dividing member 120 divided in the width direction (Y-axis direction) crossing the longitudinal direction (X-axis direction), It is provided to penetrate the bottom of the body 110 corresponding to the first plug 140a and the second room 130b capable of gas injection, and the second plug 140b and the first room capable of gas injection.
  • the first discharge nozzle 150a and the second room 130b that are provided to penetrate the bottom of the body 110 corresponding to the 130a in the vertical direction and discharge the first molten steel M1 of the first room 130a
  • a second discharge nozzle 15 that is provided to penetrate the bottom of the body 110 corresponding to the vertical direction, and discharges the second molten steel M2 of the second room 130b 0b).
  • the dividing member 120 is a means for dividing the inner space of the body 110 in the width direction (Y-axis direction) of the tundish 300. To this end, the dividing member 120 is formed to extend in the height direction and the X axis direction of the body 110, the lower end is mounted to be in contact with or coupled to the bottom surface inside the body 110.
  • the length of the vertical extension of the split member 120 may be shorter or the same as that of the body 110, and thus the height of the upper end of the split member 120 may be lower or equal to the height of the upper end of the body 110.
  • the internal space of the body 110 is divided into the first room 130a and the second room 130b based on the partition member 120 by the partition member 120.
  • the first room 130a and the second room 130b are separated by the partition member 120.
  • the dividing member 120 is formed in a plate shape extending in the vertical direction, but is not limited thereto, and divides the inner space of the body 110 in the width direction (Y-axis direction) of the tundish 300 It can be changed to various shapes that can be done.
  • a first plug 140a and a first discharge nozzle 150a are provided on the bottom of the body 110 corresponding to the lower portion of the first room 130a. At this time, the first plug 140a and the first discharge nozzle 150a are arranged in the width direction (Y-axis direction) of the tundish 300, and the first plug 140a is relatively positioned relative to the side wall of the body 110. Adjacent, the first discharge nozzle 150a may be disposed to be relatively adjacent to the dividing member 120.
  • a second plug 140b and a second discharge nozzle 150b are provided on the bottom of the body 110 corresponding to the lower portion of the second room 130b.
  • the second plug 140b and the second discharge nozzle 150b are arranged in the width direction (Y-axis direction) of the tundish 300, and the second plug 140b is relatively positioned relative to the side wall of the body 110. Adjacent, the second discharge nozzle 150b may be disposed to be relatively adjacent to the dividing member 120.
  • the first discharge nozzle 150a and the second discharge nozzle 150b may be provided so that their lower ends protrude downward from the bottom surface of the ladle 100.
  • the first discharge nozzle 150a is disposed between the first plug 140a and the dividing member 120. It is positioned and arranged so that the second discharge nozzle 150b is positioned between the dividing member 120 and the second plug 140b.
  • a gas supply unit for supplying an inert gas such as argon (Ar) gas may be connected to each of the first and second plugs 140a and 140b described above.
  • the inert gas supplied through the gas supply unit and the first and second plugs 140a and 140b is blown into the first room 130a and the second room 130b, respectively, and the first and second molten steels M1 and M2, respectively. It may serve to agitate, or to separate the inclusions.
  • the casting equipment according to the embodiment of the present invention is a equipment for casting a multi-layer cast iron having different components of the surface layer and the inner layer.
  • it is a facility for casting a multi-layer cast iron having different surface layer properties and inner layer properties.
  • the first molten steel (M1) and the second molten steel (M2) are provided in the ladle 100. More specifically, any of the first room 130a and the second room 130b of the ladle 100, for example, after the additive is added to the first room 130a, the first room 130a and the second The molten steel having the same component composition is charged into the room 130b. Accordingly, as the molten steel charged into the first room 130a and the additive are mixed, the first molten steel M1 is prepared, and the molten steel accommodated in the second room 130b is the first molten steel M1 by the additive. It becomes the 2nd molten steel (M2) which has a composition different from that.
  • the molten steel having the same composition is charged in the first room 130a and the second room 130b to obtain the first molten steel M1 and the second molten steel M2.
  • the present invention is not limited thereto, and if the first molten steel M1 is accommodated in the first room 130a of the ladle, and the second molten steel M2 is accommodated in the second room 130b, various methods may be applied. This is possible. For example, the first molten steel M1 and the second molten steel M2 having different components are provided outside the ladle 100, the first molten steel M1 is charged into the first room 130a, and the second molten steel is provided. (M2) may be charged in the second room 130b.
  • the additive is a material containing a component necessary for the surface layer to have a desired function, and hereinafter, a component required for having a desired function or a desired function is referred to as an 'additive component'. Accordingly, the additive may be described as a material containing an additive component.
  • an additive component may be Cr, and the additive may be a material containing Cr, for example, ferroalloy.
  • the additive component is not limited to the above-described Cr, and may be at least one of C, Si, Mn, Ni, and Al depending on functions to be added to the surface layer, such as plating properties, weldability, and electrical properties.
  • the inert gas is blown using the first and second plugs 140a and 140b, thereby allowing the first room ( 130a) can be uniformly mixed with the molten steel and the additive, and the advantages of easier component adjustment as the inclusions generated in each of the first room 130a and the second room 130b can be separated by floating have.
  • the tundish 300 has a body 310 having an inner space and an inner space, and the body 310 to divide the inner space of the body 310 into an inner space and an outer space. ) Includes a partition wall portion 320 installed inside.
  • the interior space of the main body 310 corresponds to a space corresponding to the outside of the partition wall part 320 and an inner side of the partition wall part 320 It is divided into spaces.
  • the outer space of the partition part 320 is referred to as a first accommodating space 330a and the inner space of the partition part 320 is referred to as a second accommodating space 330b.
  • the tundish 300 includes a main body 310 having an internal space, an internal space of the main body 310, a first accommodating space 330a, and a second accommodating space 330b, which is an inner space of the first accommodating space 330a. It includes a partition wall portion 320 installed inside the body 310 to divide into.
  • the tundish 300 is provided to penetrate the bottom surface of the main body 310 corresponding to the first receiving space 330a in the vertical direction, and the first molten steel M1 as the mold 410a of the first casting apparatus 400a.
  • the tundish 300 is provided to penetrate the bottom surface of the main body 310 corresponding to the first receiving space 330a in the vertical direction, and is the first to the second mold 410b of the second casting device 400b. It is provided to penetrate the bottom surface of the main body 310 corresponding to the third upper nozzle 343 and the second receiving space 330b that supplies the molten steel M1 in the vertical direction, and the second of the second casting device 400b. It includes a fourth phase nozzle 344 for supplying the second molten steel (M2) to the mold (410b).
  • the body 310 has a shape having at least a bottom portion and a predetermined height, and a side wall portion formed to surround an edge of the bottom portion.
  • first to fourth upper nozzles 341, 342, 343, and 344 are provided on the bottom surface of the main body 310, and the ladle 100 is positioned on the upper side of the main body 310, so that the first And first and second molten steel from the second discharge nozzles 150a and 150b and the first and second supply nozzles 200a and 200b.
  • the first and second molten steel (M1, M2) from the first and second discharge nozzles (150a, 150b) of the ladle 100 is a position or space to be supplied to the tundish 300, the first and second It is preferable that the first to fourth phase nozzles 341, 342, 343, and 344 for discharging molten steels M1 and M2 to the first and second casting devices 400a and 400b are not adjacent to each other and are far apart. Do.
  • the main body 310 intersects the first body 311 formed in the X-axis direction (longitudinal direction or the first extending direction) and the extending direction (X-axis direction) of the first body 311 It may include a second body 312 formed in the direction, that is, in the Y-axis direction (width direction or second extension direction).
  • the length of the second body 312 in the X-axis direction is shorter than the length of the first body 311 in the X-axis direction.
  • the center of the X-axis direction of the first body 311 and the center of the X-axis direction of the second body 312 may be provided to be positioned on a straight line.
  • the body 310 is formed to extend in the X-axis direction as a whole, and may be described as a shape protruding in the Y-axis direction. Accordingly, the inner space of the main body 310 extends in the X-axis direction, the space formed by the first body 311, and extends in the Y-axis direction from the X-axis extended space, and is provided by the second body 312. It is provided to include the formed protrusion space.
  • the space of the second body 312 is a space receiving the first and second molten steels M1 and M2 from the ladle.
  • the first and second molten steels M1 and M2 of the ladle 100 are supplied to the protruding space among the inner spaces of the main body 310.
  • the ladle 100 is positioned above the second body 312 of the tundish 300.
  • the partition part 320 is installed inside the main body 310, and divides the inside of the main body 310 into a first accommodating space 330a and a second accommodating space 330b.
  • the partition wall portion 320 is preferably a shape corresponding to the shape of the body 310.
  • the partition wall part 320 is formed by extending the first to fourth fourth nozzles 341, 342, 343, and 3444 in the array direction (ie, the X-axis direction) or the first body 311 in the extending direction.
  • the wall 321 and the second partition wall 322 may be formed to extend in a direction crossing the extension direction of the first partition wall 321 (ie, the X-axis direction) (Y-axis direction).
  • the length of the second partition wall 322 in the X-axis direction is shorter than the length of the first partition wall 321 in the X-axis direction. Then, the center of the first partition wall 321 in the X-axis direction and the center of the second partition wall 322 in the X-axis direction may be provided to be positioned on a straight line.
  • the first partition wall 321 is located inside the first body 311, and at least a part of the second body 312 is the second body 312 may be installed to be located inside.
  • the other side surface of the first partition wall 321 based on the Y-axis direction may be installed to contact or space away from the inner surface of the first body 311 facing this side.
  • other side surfaces of the outer side surface of the first partition wall 321 except for the other side surface are installed to be spaced apart from the inner side surface of the first body 311.
  • the second partition wall 322 may be installed so that the whole is located inside the second body 312, or only a part thereof may be installed inside the second body 312.
  • the interior space of the tundish 300 is divided into the first accommodation space 330a and the second accommodation space 330b by the above-described main body 310 and the partition part 320. That is, the partition is divided into a first accommodating space 330a corresponding to the outside of the partition part 320 and a second accommodating space 330b corresponding to the inside of the partition part 320.
  • each of the first and second receiving spaces 330a and 330b is formed to extend in the X-axis direction as a whole, and may be a shape protruding in the Y-axis direction. have.
  • each of the first and second receiving spaces 330a and 330b includes a space extending in the X-axis direction and a protruding space extending in the Y-axis direction from the X-axis extending space.
  • the space of the second partition wall 322 is a space receiving the first and second molten steel M2 from the ladle 100.
  • the first and second molten steels M1 and M2 of the ladle are supplied to the protruding space among the inner spaces of the partition part 320.
  • the ladle 100 is positioned above the second body 312 and the second partition 322 of the tundish 300. More specifically, the second body 312 and the second partition wall so that the first discharge nozzle 150a that supplies the first molten steel M1 to the tundish 300 corresponds to the first receiving space 330a. It is installed so as to be located between the (322). In addition, the second discharge nozzle 150b that supplies the second molten steel M2 to the tundish 300 is installed to be located inside the second partition wall 322 so as to correspond to the second receiving space 330b. .
  • the first supply nozzle 200a is positioned between the first discharge nozzle 150a and the tundish 300, and its upper end is connected to the first discharge nozzle 150a. Accordingly, the first molten steel M1 discharged from the first discharge nozzle 150a is supplied to the tundish 300 through the first supply nozzle 200a. That is, the first supply nozzle 200a is installed to correspond to the outer space of the first receiving space 330a or the second partition 322 of the tundish 300.
  • the second supply nozzle 200b is positioned between the second discharge nozzle 150b and the tundish 300, and its upper end is connected to the second discharge nozzle 150b. Accordingly, the second molten steel M2 discharged from the second discharge nozzle 150b is supplied to the tundish 300 through the second supply nozzle 200b. That is, the second supply nozzle 200b is installed to correspond to the second receiving space 330b of the tundish 300 or the inner side of the second partition 322.
  • the first to fourth phase nozzles 341, 342, 343, and 344 are first and second casting devices 400a and 400b, respectively, of the first and second molten steels M1 and M2 supplied into the tundish 300. It is a means to supply to each mold 410a, 410b.
  • the first to fourth phase nozzles 341, 342, 343, and 344 are arranged in the X-axis direction or in the arrangement direction of the molds 410a, 410b of the first and second casting devices 400a, 400b, as described above. do.
  • each of the first and third upper nozzles 341 and 343 is a nozzle that discharges the first molten steel M1, and is installed to communicate with the first receiving space 330a of the tundish 300.
  • the first upper nozzle 341 is provided on one side outside of the first partition wall 321
  • the third upper nozzle 343 is provided on the other outer side of the first partition wall 321. Accordingly, the first phase nozzle 341 and the third phase nozzle 343 are spaced apart in the X-axis direction with the first partition wall 321 therebetween.
  • Each of the second and fourth phase nozzles 342 and 343 is a nozzle that discharges the second molten steel M2 and is installed to communicate with the second receiving space 330b of the tundish 300. That is, the second and fourth phase nozzles 342 and 344 are installed inside the first partition wall 321, and the second phase nozzle 342 and the fourth phase nozzle 344 are arranged in the X-axis direction. Are spaced apart.
  • the second phase nozzle 342 and the fourth phase nozzle are provided in the first partition wall 321, wherein the separation distance between the first phase nozzle 341 and the second phase nozzle 342 is described later. 1 is smaller than the length in one direction of the mold 410a of the casting apparatus 400a, and the separation distance between the third phase nozzle 343 and the fourth phase nozzle 344 is the mold 410b of the second casting apparatus 400b It is smaller than the length in one direction.
  • the separation distance between the second phase nozzle 342 and the fourth phase nozzle 344 is the separation distance between the first phase nozzle 341 and the second phase nozzle 342 and the third phase nozzle 343 and the fourth phase.
  • the distance between the nozzles 344 may be large.
  • the first and second casting devices 400a and 400b are devices that receive the first molten steel M1 and the second molten steel M2 from the tundish 300 to cast a double-layer cast.
  • the first casting device 400a and the second casting device 400b are arranged in the arrangement direction or the X-axis direction of the first to fourth phase nozzles 341, 342, 343, and 344 of the tundish 300 as a whole. do.
  • first and second casting devices 400a and 400b will be described.
  • the first casting apparatus 400a receives the first and second molten steels M1 and M2 and provides the first molten steel M1 from the first mold 410a and the ladle 100 to initially solidify the molten steel into a predetermined shape.
  • the first upper immersion nozzle 420a which is received and supplied to the first mold 410a, receives the second molten steel M2 from the ladle 100, supplies it to the first mold 410a, and supplies the first upper immersion nozzle 420a It includes a first lower immersion nozzle (430a) for discharging the second molten steel (M2) in a lower position compared to), a first magnetic field generating unit (460a) for applying a direct current magnetic field in the first mold (410a).
  • the first casting device 400a fastens the first upper nozzle 341 and the first upper immersion nozzle 420a, and communicates with the first upper nozzle 341 and the first upper immersion nozzle 420a.
  • the second gate 450a to be controlled is provided below the first mold 410a to perform a series of molding operations to perform a series of molding operations while secondarily cooling the slab in the reaction state drawn from the first mold 410a. And a first cooling zone (not shown) in which the roll and the first spray nozzle are continuously arranged.
  • the first mold 410a is installed to correspond to the first and second upper nozzles 341 and 342 of the tundish 300.
  • the first mold 410a receives molten steel from the tundish 300 and initially solidifies the molten steel into a predetermined shape.
  • the first mold 410a may have a rectangular cross-sectional shape, for example.
  • each of the first molds 410a is formed to extend in one direction (X-axis direction), and a pair of long sides and each of which is spaced apart in a direction intersecting or orthogonal to the extending direction (Y-axis direction) and each of the long sides It is formed to extend in an intersecting or orthogonal direction (Y-axis direction), and includes a pair of short sides installed spaced apart in an intersecting or orthogonal direction (X-axis direction). And, inside each of the short sides and the long sides of the first mold 410a, a flow path through which cooling water for cooling molten steel flows is provided.
  • the first upper immersion nozzle 420a supplies the first molten steel M1 to the first mold 410a
  • the first lower immersion nozzle 430a supplies the second molten steel M2 to the first mold 410a.
  • the first upper immersion nozzle 420a and the first lower immersion nozzle 430a are arranged in the extending direction (ie, the X-axis direction) of the long side of the mold and are spaced apart from each other.
  • the first upper immersion nozzle 420a and the first lower immersion nozzle 430a have different heights of discharge ports through which molten steel is discharged. That is, the height of the discharge port (hereinafter, the first upper discharge port) of the first upper immersion nozzle 420a is higher than the height of the discharge port (hereinafter, the first lower discharge port) of the first lower immersion nozzle 430a. In other words, the height of the first lower discharge port 431a is lower than the height of the first upper discharge port 421a.
  • the first upper immersion nozzle 420a and the first lower immersion nozzle 430a may be formed to have different lengths, and an extended length of the first upper immersion nozzle 420a is the first lower immersion nozzle 430a. It may be shorter than the extended length of the, the first upper immersion nozzle (420a) and the first lower immersion nozzle (430a) may be provided with a discharge port in each lower portion. And the upper ends of each of the first upper immersion nozzle 420a and the first lower immersion nozzle 430a are connected to the first and second upper nozzles 431 and 432 located above the first mold 410a. It is connected so that the tops have the same height. Accordingly, the height of the first upper discharge port 421a is higher than that of the first lower discharge port 431a.
  • the first magnetic field generating unit 460a is a means for applying a magnetic force into the first mold 410a, and more specifically, a means for applying a uniform DC magnetic field in the width direction (Y-axis direction) of the first mold 410a. to be.
  • the first magnetic field generating unit 460a may be installed to be located outside each of the pair of short sides of the first mold.
  • the first cooling zone is not shown, but is provided between a plurality of first rolls and a plurality of first rolls arranged in one direction from the lower side of the first mold 410a and a first spray nozzle for spraying cooling water toward the cast piece.
  • each of the first roll and the first spray nozzle may be provided to be located on the upper side of the upper surface of the cast piece and the lower side of the lower surface. Accordingly, the cast steel drawn from the first mold is completely solidified while being cooled in the second direction by the cooling water sprayed from the first spray nozzle while moving in the direction in which the first rolls are arranged.
  • the second casting device 400b has a similar configuration and shape to the first casting device 400a described above.
  • the second casting apparatus 400b receives the first and second molten steels M1 and M2, and the first molten steel M1 from the second mold 410b and the ladle 100 to initially solidify the molten steel into a predetermined shape.
  • the second upper immersion nozzle (420b) to be supplied to the second mold (410b), the second molten steel (M2) from the ladle 100 is supplied to the second mold (410b), the second lower immersion nozzle It includes a second lower immersion nozzle (430b) for discharging the second molten steel (M2) in a lower position compared to (430b), a second magnetic field generating unit (460b) for generating a magnetic field in the second mold (410b).
  • the second casting apparatus 400b fastens the third upper nozzle 343 and the second upper immersion nozzle 420b, and communicates with the third upper nozzle 343 and the second upper immersion nozzle 420b.
  • the third gate (440b), the fourth upper nozzle 344 and the second lower immersion nozzle 430b are mutually fastened, and the communication between the fourth upper nozzle 344 and the second lower immersion nozzle 430b is controlled.
  • the second mold 410b is arranged to be spaced apart from the first mold 410a in the X-axis direction, and is installed to correspond to the lower sides of the third and fourth upper nozzles 343 and 344 of the tundish 300.
  • the second upper immersion nozzle 420b is a means for supplying the first molten steel to the second mold 410b
  • the second lower immersion nozzle 430b is a means for supplying the second molten steel M2 to the second mold 410b.
  • the second upper immersion nozzle 420b and the second lower immersion nozzle 430b are arranged to be spaced apart from each other in the extending direction (ie, the X-axis direction) of the long sides of the second mold 410b.
  • the heights of the discharge ports through which the molten steel is discharged are different from the second upper immersion nozzle 420b and the second lower immersion nozzle 430b. That is, the height of the discharge port (hereinafter, the second upper discharge port 421b) of the second upper immersion nozzle 420b is at the height of the discharge port (hereinafter, the second lower discharge port 431b) of the second lower immersion nozzle 430b. Higher than that.
  • the second cooling zone includes a plurality of second rolls arranged in one direction from a lower side of the second mold and a second spray nozzle provided between the plurality of second rolls and spraying cooling water toward the cast piece.
  • the cast steel drawn from the first mold 410a solidifies while moving in the alignment direction of the plurality of first rolls, and the cast steel drawn from the second mold 410b moves in the alignment direction of the plurality of second rolls Solidifies as it moves.
  • the first mold 410a and the first cooling zone through which the molten steel or the mold passes may be referred to as a first strand, the second mold 410b and the second cooling zone as a second strand. That is, the casting equipment according to the embodiment of the present invention includes a plurality of strands.
  • the first molten steel and the second molten steel having different components are prepared and supplied to the first mold 410a.
  • the first molten steel (M1) and the second molten steel (M2) may be, for example, molten steel for low-carbon steel including 0.018 wt% C, 0.035 wt% Si, 1.15 wt% Mn, and 0.1 wt% Ni.
  • the second molten steel M2 may be molten steel further containing 3 wt% Cr compared to the first molten steel M1.
  • the first molten steel M1 When the first molten steel M1 is supplied to the first mold 10 through the first upper immersion nozzle 420a, the first molten steel M1 solidifies to form a solidified shell (hereinafter, the first solidified shell C1). do. At this time, since the flow path through which the refrigerant flows is buried in the inner wall of the first mold 410a, the temperature of the inner wall of the first mold 410a is the lowest. Therefore, when the first molten steel M1 is supplied, the first solidification shell C1 is formed along the inner wall surface of the first mold 410a.
  • the first solidification shell C1 is formed along the inner wall surface of the first mold 410a, a space surrounded by the first solidification shell C1 is formed, and the first lower immersion nozzle 430a is used as the space.
  • the second molten steel (M2) is supplied.
  • the second molten steel M2 discharged from the first lower immersion nozzle 430a is supplied to fill the space partitioned by the first solidification shell C1.
  • the second molten steel (M2) supplied from the first lower immersion nozzle (430a) is solidified to form a solidified shell (hereinafter, the second solidified shell (C2)), the first molten steel (M1) is initially supplied It is formed along the inner wall surface of the first solidification shell (C1).
  • the first magnetic field generating unit 460a is positioned between the first upper discharge port 421a of the first upper immersion nozzle 420a and the first lower discharge port 431a of the first lower immersion nozzle 430a. Accordingly, the first molten steel M1 discharged from the first upper discharge port 421a is discharged to the upper side of the first magnetic field generating unit 460a, and the second molten steel M2 discharged from the first lower discharge port 431a is It is discharged to the lower side of the first magnetic field generator 460a.
  • the magnetic field applied from the first magnetic field generating unit 460a is the first molten steel (M1) is moved to the lower side of the first magnetic field generating unit (460a), or the second molten steel (M2) is the first magnetic field generating unit (460a) ) Acts as a resistor to suppress the upward movement.
  • the molten steel pool made of the first molten steel M1 (that is, near the first magnetic field generating portion 460a or in a position corresponding to the first magnetic field generating portion 460a in the first mold 410a (ie, Upper pool) and the second molten steel (M2) may be divided into a molten steel pool (ie, a lower pool).
  • the multi-layer cast iron is cast by using the first molten steel (M1) and the second molten steel (M2), which have different compositional components, so that the composition of the components of the surface layer SL and the inner layer IL is different. More specifically, the first molten steel (M1) and the second molten steel (M2) have different contents for the additive components, and thus the surface layers SL and the inner layer IL have different contents for the additive components. Accordingly, the surface layer SL and the inner layer IL of the multi-layer cast iron may be defined or classified according to the content (or concentration) of the additive component.
  • the multi-layer cast according to the embodiment has a concentration gradient in which the concentration of the additive component in the surface layer SL decreases toward the inner side from the surface (see FIG. 5).
  • each of the second molten steel M2 and the inner layer IL may or may not contain a small amount of additive components.
  • the surface layer (SL) from the surface of the cast to the point where 0.5% of the content of the additive component contained in the first molten steel (M1) can be referred to as the surface layer (SL).
  • the surface layer from 100% to 0.5% (in the order from the surface to the inside) of the content of the additives contained in the first molten steel M1 can be defined as the surface layer.
  • an area of less than 0.5% (including 0%) of the content of the additive component included in the first molten steel M1 may be defined as an inner layer IL.
  • the content of the additive component in the surface layer SL varies in the range of 100% to 0.5% in the inner direction.
  • the content of the additive component in the inner layer IL is less than 0.5% and may be 0%.
  • the surface layer SL is changed so that the content of the additive component decreases from the surface to the inner direction.
  • the concentration gradient layer (CGA) is defined as the point at which the ratio is reached.
  • the point at which 90% of the content of the additive component included in the first molten steel is the starting point (As) of the concentration gradient layer, and the point at which the predetermined ratio is the ending point (Ae) of the concentration gradient layer.
  • Equation 1 Since the concentration of the additive component serving as a reference for the starting point (As) of the concentration gradient layer is 90% of the content of the additive component included in the first molten steel (M1), this is expressed by Equation 1 below.
  • the reference concentration that becomes the concentration gradient starting point As calculated by Equation 1 is 2.7 wt%.
  • the point at which the calculated concentration is the concentration gradient layer starting point (As).
  • the concentration of the additive component serving as a reference for the end point (Ae) of the concentration gradient layer is the sum of the content of the additive component in the second molten steel (M2) and 5% of the content of the additive component contained in the first molten steel (M1). It is determined by the value (see Equation 2)
  • Equation 1 when the content of Cr as an additive component in the first molten steel (M1) is 3wt%, and the Cr content in the second molten steel (M2) is 0.01wt%, applying this to Equation 1 ends the concentration gradient layer ( The reference concentration to be Ae) is 0.16 wt%. And, the point at which the concentration of the end point calculated as described above may be the end point (Ae) of the surface layer.
  • the concentration gradient layer (CGA) is from the point where the content of the additive component is 2.7 wt% or more to the point where it is 0.16 wt% or less.
  • the reference concentration serving as the end point of the concentration gradient layer is 0.15 wt%.
  • the thickness T of the concentration gradient region CGA is set to 1.4% to 8.5% of the total thickness of the cast steel.
  • the thickness T of the concentration gradient region CGA means the length from the starting point As of the concentration gradient layer to the ending point Ae of the concentration gradient layer.
  • a magnetic field is applied to the molds 410a and 410b using the magnetic field generating units 460a and 460b.
  • the thickness T of the concentration gradient layer (CGA) is 1.4% to 8.5% of the total thickness of the cast steel, the first and the first 2
  • the intensity of the magnetic force density applied from the magnetic field generating units 460a and 460b is adjusted to 0.2 Tesla to 0.8 Tesla.
  • the concentration gradient region (CGA) is preferably 1.4% to 8.5% or less of the total thickness of the cast piece S, and for this purpose, the intensity of the magnetic flux density is 0.2 tesla to 0.8 tesla (0.2 tesla or more, 0.8). Tesla) or less is preferred.
  • the strength of the magnetic force is less than 0.2 Tesla
  • a large amount of the first molten steel and the second molten steel are mixed to such an extent that no boundary region exists inside the mold. Accordingly, a cast piece having no difference in the content of components between the surface layer and the inner layer can be cast. That is, a multi-layer cast may not be produced.
  • the thickness of the concentration gradient region (CGA) becomes thinner, it means that the boundary of the concentration of the additive component between the surface layer and the inner layer becomes clearer.
  • the thickness of the concentration gradient area (CGA) is not thin or less than 1.4% of the total thickness of the cast steel, and even if the concentration gradient area (CGA) is 1.4% or more, the surface layer of the cast steel (S) is added by the additive component It may have a desired function (eg, corrosion resistance). Accordingly, there is no need to make the thickness of the concentration gradient region (CGA) thinner to less than 1.4%.
  • the intensity of the magnetic flux density is 0.2 Tesla to 0.8 Tesla (0.2 Tesla or more, 0.8 Tesla), so that the concentration gradient region (CGA) has a thickness of 1.4% to 8.5% of the total thickness of the cast steel.
  • the surface layer has the desired characteristics when casting a multi-layer cast.
  • a multi-layer cast was cast in the same manner as in Example using the first molten steel and the second molten steel having different Cr contents, and the concentration of the magnetic flux density was 0.2 Tesla to 0.8 Tesla, and the concentration gradient A multi-layer cast having a region was cast.
  • a sample was prepared by sampling a part of the produced cast. Then, the sample was evaluated by applying tensile stress in an atmosphere of sulfuric acid (H 2 S), which is one of strong acids, and measuring the breakdown yield strength.
  • H 2 S sulfuric acid
  • the multi-layer cast iron according to the embodiment of the present invention does not have a clear boundary for the concentration of added components between the surface layer and the inner layer as in the prior art, and has a concentration gradient, but has a function to be added to the surface layer, such as sufficient corrosion resistance. Can be cast.
  • the surface of the cast piece S has a function to be added, such as corrosion resistance
  • the difference in component content between the surface layer and the inner layer based on the boundary between the surface layer and the inner layer is less than in the prior art. Accordingly, separation, cracks, or defects between the surface layer and the inner layer due to component differences can be reduced.
  • FIG. 7 is a flowchart sequentially showing a method of casting a multi-layer cast iron according to an embodiment of the present invention.
  • any one of the first room 130a and the second room 130b in the ladle 100 is added with an additive to the first room 130a (S100).
  • the additive is for preparing the first molten steel (M1) and the second molten steel (M2) having different component compositions, and may be alloy iron containing a component to be differentiated.
  • the additive component is Cr
  • the additive may be a material containing Cr, for example, ferroalloy.
  • the molten steel charged into the first room 130a and the second room 130b may be molten steel having the same composition.
  • the molten steel charged into the first room 130a and the second room 130b is a low-carbon steel for low carbon steel including 0.018 wt% C, 0.035 wt% Si, 1.15 wt% Mn, and 0.1 wt% Ni. You can.
  • the alloy iron is melted by the temperature of the molten steel, whereby the molten steel accommodated in the first room 130a has a different Cr content from the molten steel accommodated in the second room 130b, or It is made of molten steel containing Cr.
  • the molten steel contained in the first room 130a 2 The composition of molten steel accommodated in the room 130b is different. That is, the first molten steel M1 provided in the first room 130a and the second molten steel M2 provided in the second room differ in at least Cr content.
  • the Cr content in the first molten steel (M1) may be, for example, 3 wt%, which can be adjusted by controlling the amount of additives and the type of additives.
  • the provision of the first molten steel (M1) containing Cr is for casting a multi-layer cast with improved corrosion resistance of the surface layer.
  • an inert gas for example, Ar (argon) gas is blown into each of the first and second plugs 140a and 140b (S300).
  • Ar argon
  • Mixing is performed between the molten steel and the additives in the first room 130a by the Ar gas blown from the first and second plugs 140b, and the inclusions are separated in the first room 130a and the second room 130b, respectively. Injuries may occur.
  • the ladle 100 is moved upwardly to the tundish 300 to supply the first molten steel M1 and the second molten steel M2 to the tundish 300 (S400).
  • the first discharge nozzle 150a and the first supply nozzle 200a are positioned corresponding to the upper side of the first receiving space 330a in the tundish, and the second discharge nozzle 150b and the second supply nozzle 200b are disposed. It is positioned above the second receiving space 330b of the tundish 300.
  • the first discharge nozzle 150a and the first supply nozzle 200a are fastened, and the second discharge nozzle 150b and the second supply nozzle 200b are fastened to each other.
  • the first and second of the ladle 100 are communicated.
  • the molten steel (M1, M2) is supplied as a tundish.
  • the first molten steel M1 is supplied to the first receiving space 330a of the tundish 300 by the first discharge nozzle 150a and the first supply nozzle 200a
  • the second molten steel M2 is It is supplied to the second receiving space 330b of the tundish 300 by the second discharge nozzle 150b and the second supply nozzle 200b.
  • the first to fourth gates 440a, 450a, 440b, and 450b are operated to immerse the first upper nozzle 341, the first upper immersion nozzle 420a, the second upper nozzle 342, and the first lower immersion.
  • the nozzle 430a, the third upper nozzle 343 and the second upper immersion nozzle 420b, the fourth upper nozzle 344 and the second lower immersion nozzle 430b are respectively communicated with each other.
  • the first molten steel M1 in the first accommodation space 330a of the tundish 300 is supplied to the first mold 410a through the first upper nozzle 341 and the first upper immersion nozzle 420a.
  • the second molten steel M2 in the second receiving space 330b of the tundish 300 is supplied to the first mold 410a through the second upper nozzle 342 and the first lower immersion nozzle 430a ( S500).
  • the first molten steel M1 in the first accommodation space 330a of the tundish 300 is supplied to the second mold 410b through the third upper nozzle 343 and the second upper immersion nozzle 420b.
  • the second molten steel M2 in the second receiving space 330b of the tundish 300 is supplied to the second mold 410b through the fourth upper nozzle 344 and the second lower immersion nozzle 430b ( S500).
  • the first molten steel M1 and the second molten steel M2 supplied to the first and second molds 410a and 410b are reacted and solidified inside the first and second molds 410a and 410b, respectively.
  • a multi-layer cast piece having different components of the inner layer and the inner layer is produced. That is, the first molten steel (M1) supplied to the upper side is a surface layer, and the second molten steel (M2) supplied to the lower side is a multi-layered cast piece that is an inner layer.
  • the first magnetic field generating unit 460a and the second magnetic field generating unit 460b are operated to apply a magnetic field into the first and second molds 410b, wherein the strength of magnetic density is 0.2 Tesla to 0.8 Tesla. To be.
  • each of the cast pieces drawn from the first and second molds 410a and 410b moves along a plurality of first rolls under the first mold 410a and a plurality of second rolls under the second mold 410b. Secondary cooling by the sprayed cooling water completely solidifies.
  • the cast iron S manufactured from the first casting device 400a and the second casting device 400b is a multi-layer cast steel having different components of the surface layer and the inner layer. That is, since the surface layer is cast from the first molten steel containing 3 wt% of Cr, the surface layer has properties of stainless steel having corrosion resistance by Cr. In addition, the inner layer is cast from a second molten steel and has characteristics of low carbon steel.
  • the strength of the magnetic force density is 0.2 Tesla to 0.8 Tesla, so that the surface layer SL has a concentration gradient with respect to the additive component, thereby producing a multi-layered cast piece. do. That is, the surface layer SL has a concentration gradient layer (CGA) in which the concentration of the additive component gradually decreases from the surface toward the inner layer.
  • CGA concentration gradient layer
  • the concentration of the additive component in the surface layer SL is higher than that of the inner layer, the concentration of the additive component increases in the surface layer SL toward the outermost surface of the cast piece S.
  • the thickness of the concentration gradient layer may be 1.4% to 8.5% of the total thickness of the cast steel.
  • the surface layer SL has a function corresponding to the surface layer of the multi-layer slab that does not have a concentration gradient, such as corrosion resistance.
  • first molten steel (M1) and the second molten steel (M2) are provided separately from the ladle 100, and as it is supplied to the tundish, it is possible to cast a multi-layered cast iron with uniform components in the longitudinal direction.
  • the additives and molten steel are uniformly mixed or the components are uniform.
  • One first molten steel can be prepared.
  • a multi-layer cast piece having uniform components in the longitudinal direction of the surface layer can be produced.
  • the production rate of the multi-layer cast iron improve it.
  • the equipment is configured to have a plurality of strands, it is possible to improve the production rate of the multi-layer cast iron.
  • the first molten steel and the second molten steel are provided separately from the ladle, and by supplying them in a tundish, a multi-layer cast with uniform components in the longitudinal direction of the cast can be cast.

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Abstract

Une installation de coulage selon un mode de réalisation de la présente invention comprend: une poche pourvue d'une première zone et d'une seconde zone, chacune d'entre elles pouvant recevoir de l'acier fondu; un panier de coulée ayant un premier espace de réception et un second espace de réception disposé à l'intérieur de celui-ci, le premier espace de réception étant apte à recevoir un premier acier fondu fourni à partir de la première zone, et le second espace de réception étant apte à recevoir un second acier fondu fourni à partir de la seconde zone; et un moule qui est disposé au-dessous du panier de coulée, solidifie le premier acier fondu et le second acier fondu fourni par le panier de coulée, et coule une brame à double couche dans laquelle les composants dans une couche de surface et une couche interne sont différents. Ainsi, selon un mode de réalisation de la présente invention, une installation peut être configurée pour comprendre une pluralité de torons afin d'améliorer le taux de production de brames à double couche. En outre, en fournissant le premier acier fondu et le second acier fondu séparés l'un de l'autre dans la poche de coulée et en les fournissant au panier de coulée, une brame à double couche dans laquelle les composants sont uniformes dans la direction longitudinale de la brame peut être coulée.
PCT/KR2019/013908 2018-10-26 2019-10-22 Installation de coulage et procédé de coulage Ceased WO2020085772A1 (fr)

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