EP2754513B1 - Continuous casting device for steel - Google Patents

Continuous casting device for steel Download PDF

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Publication number
EP2754513B1
EP2754513B1 EP11875560.2A EP11875560A EP2754513B1 EP 2754513 B1 EP2754513 B1 EP 2754513B1 EP 11875560 A EP11875560 A EP 11875560A EP 2754513 B1 EP2754513 B1 EP 2754513B1
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EP
European Patent Office
Prior art keywords
long side
side walls
casting mold
curved
molten steel
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.)
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EP11875560.2A
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German (de)
English (en)
French (fr)
Other versions
EP2754513A4 (en
EP2754513A1 (en
Inventor
Takehiko Toh
Junji Nakashima
Yasuo Maruki
Norimasa Yamasaki
Keiji Tsunenari
Kenji Umetsu
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Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
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Publication date
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Priority to PL11875560T priority Critical patent/PL2754513T3/pl
Publication of EP2754513A1 publication Critical patent/EP2754513A1/en
Publication of EP2754513A4 publication Critical patent/EP2754513A4/en
Application granted granted Critical
Publication of EP2754513B1 publication Critical patent/EP2754513B1/en
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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
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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

Definitions

  • the present invention relates to a continuous casting apparatus for steel, which supplies molten steel into a casting mold to manufacture a cast piece.
  • an electromagnetic stirring device having an electromagnetic coil provided in the vicinity of the upper portion of a casting mold is used to electromagnetically stir molten steel within the casting mold.
  • the electromagnetic stirring devices are disposed along a pair of long side walls included in the casting mold.
  • the electromagnetic stirring devices when the molten steel is discharged from a submerged entry nozzle into the casting mold, current is supplied to the electromagnetic stirring devices to apply a thrust to the upper part of the molten steel within the casting mold.
  • the molten steel is stirred in a horizontal plane by the thrust such that a swirling flow of the molten steel is formed.
  • inclusions and the like are likely to adhere to and deposit on the periphery of the submerged entry nozzle in the casting mold.
  • the adhered matter deposited as such has a thickness of several tens of millimeters. Therefore, the regions between the long side walls and the submerged entry nozzle are narrower than the other regions. In this case, the flow channel for the swirling flow is partially narrowed, and thus it is difficult for the molten steel to flow in the regions between the long side walls and the submerged entry nozzle.
  • the shortest horizontal distances between the submerged entry nozzle 103 and the long side walls 101 and 102 are longer than those of the parallel casting mold according to the related art. Therefore, the flow channels of swirling flows 110 and 111 can be widely ensured to that extent, and thus the molten steel easily flows.
  • EP 2 361 703 A discloses a continuous casting device for steel in which the device includes a casting mold for casting a molten steel, a submerged entry nozzle, an electromagnetic stirring device, and an electromagnetic brake device, and a curved portion which is curved toward the electromagnetic stirring device is formed at least at a position where the curved portion faces the submerged entry nozzle, on each of the long side walls, and the horizontal distance between a top of the curved portion and the submerged entry nozzle in plan view is equal to or more than 35 mm and less than 50 mm.
  • JP H09-512484 discloses an improved continuous metal casting mold incorporating a removable cassette insert member that has a uniform thickness copper facing plate and a steel backing plate fastened together in such a way as to allow three-dimensional expansion of the copper plate in relation to the steel plate to minimize the thermal stresses exerted on the copper plate and the temperature differential along the surface of the copper plate.
  • the electromagnetic field made by the electromagnetic stirring devices 106 and 107 is an alternate current magnetic field, and thus the magnetic field is attenuated in conductors. Therefore, in the parts of the curved surfaces 104 and 105, the magnetic field is less attenuated than the other linear parts, and thus the electromagnetic force increases.
  • the flow velocity of the stirring flow in the regions between the curved surfaces 104 and 105 and the submerged entry nozzle 103 becomes faster than that in the other regions.
  • the flow velocity of stirring flows 110 and 111 becomes partially non-uniform, a flow disturbance or a stagnant zone is generated in regions 112 and 113 on the downstream sides of the stirring flows 110 and 111 in the long side walls 101 and 102, and there is a problem in that inclusions, bubbles, and the like are likely to be trapped by a solidified shell. Therefore, enhancement of steel quality to an expected degree cannot be obtained.
  • the inventors had further performed examinations, and found that trapping of inclusions by the solidified shell of the long side walls 101 and 102 could not be suppressed by only forming the curved surfaces 104 and 105 which allow the stirring flows 110 and 111 to easily flow. That is, it was proved that when the horizontal distance between the curved surfaces 104 and 105 and the submerged entry nozzle 103 is increased, trapping of bubbles can be suppressed.
  • the electromagnetic force is also strengthened, and the flow velocities of the stirring flows that flow in the regions between the curved surfaces 104 and 105 and the submerged entry nozzle 103 become faster than those of the stirring flows that flow in the other regions. Therefore, a flow disturbance or a stagnant zone is generated in the regions 112 and 113 on the downstream sides of the stirring flows 110 and 111, and thus a problem in which inclusions are likely to be trapped by the solidified shell is not solved.
  • the present invention has been made taking the foregoing points into consideration, and an object thereof, even in an irregular shaped casting mold in a continuous casting apparatus for steel, is to allow the flow velocity of molten steel at the upper portion in the casting mold to be uniform and to allow a horizontal distance between a surface concavely curved in the casting mold and a submerged entry nozzle to be appropriate, thereby enhancing the quality of a cast piece obtained by casting.
  • the shortest horizontal distance be 50 mm to 75 mm in the range from the lower end portion of the electromagnetic stirring device to a position higher than the upper end portion of the electromagnetic stirring device by 50 mm when viewed along the vertical direction.
  • each of the long side walls has the curved portion which is convexly curved toward the electromagnetic stirring device at least at a position that faces the submerged entry nozzle, and each of the long side walls including the curved portion has a uniform thickness. Therefore, the electromagnetic force generated by the electromagnetic stirring device is uniform over the curved portion and the other parts. As a result, the flow velocity of the stirring flow becomes uniform. That is, the intensity distribution of the electromagnetic force when each of the long side walls is seen in plan view is the same in the curved portion and the parts other than the curved portion. Therefore, unlike the related art, the electromagnetic force can be prevented from becoming partially stronger at a point corresponding to the curved portion.
  • the shortest horizontal distance between the top of the curved portion and the submerged entry nozzle is set to be 30 mm to 80 mm in a range from the position of the lower end portion of the electromagnetic stirring device to a position higher than the upper end portion of the electromagnetic stirring device by 50 mm when viewed in the height direction of the continuous casting apparatus, a smooth and uniform flow of the molten steel can be ensured even in the region between the top of the curved portion and the submerged entry nozzle.
  • the shortest horizontal distance between the top of the curved portion and the submerged entry nozzle is smaller than 30 mm, it is difficult for the molten steel to flow in the curved regions, and bubbles and the like in the molten steel are likely to be trapped by the solidified shell.
  • the shortest horizontal distance exceeds 80 mm, it is difficult to ensure a uniform flow of the molten steel in the curved region, and in a region where the flow velocity of the molten steel is slow, inclusions in the molten steel are likely to be trapped by the solidified shell.
  • the shortest horizontal distance between the top of the curved portion and the submerged entry nozzle is set to 30 mm to 80 mm. Therefore, in the curved region between the top of the curved portion and the submerged entry nozzle, a smooth and uniform flow of the stirring flow of the molten steel is ensured, and bubbles in the molten steel can be prevented from being trapped by the solidified shell.
  • the range in the height direction in which the shortest horizontal distance between the top of the curved portion and the submerged entry nozzle is set to 30 mm to 80 mm is a range from the lower end portion of the electromagnetic stirring device to a position higher than the upper end portion of the electromagnetic stirring device by 50 mm. This is because although a part of the molten steel that is directly stirred by the electromagnetic force generated by the electromagnetic stirring device is a part from the lower end portion to the upper end portion of the electromagnetic stirring device, in a practical operation, the surface of a meniscus is positioned at a position higher than the upper end portion of the electromagnetic stirring device.
  • the height is at a position higher than the upper end portion of the electromagnetic stirring device by about 50 mm. Therefore, the range in the height direction in which the shortest horizontal distance between the top of the curved portion and the submerged entry nozzle is set to be 30 mm to 80 mm is from the lower end portion of the electromagnetic stirring device to the position higher than the upper end portion of the electromagnetic stirring device by 50 mm.
  • a uniform thickness of the long side wall is referred to as a thickness in which a change in a penetration degree of an electromagnetic field in the molten steel due to a change in thickness excluding parts where bolt holes, cooling water grooves, and the like are formed is less than 10% which is an error in an acceptable range.
  • a magnetic field having a predetermined magnetic flux density is applied to the inside of the casting mold from the outside of the long side wall, the magnetic field intensity induced inside the casting mold has a loss depending on the value of the thickness of the long side wall. That is, when the thickness of the long side wall is changed, the penetration depth of the magnetic field into the casting mold is changed.
  • the magnetic field intensity in the casting mold is changed with the magnitude of the loss.
  • the thickness of the long side wall is caused to be uniform so that the change is less than 10% when viewed in the horizontal direction along the wall surface of the long side wall.
  • the range in the height direction of the uniform thickness of the long side wall may be a range from the lower end portion of the electromagnetic stirring device to a position higher than the upper end portion of the electromagnetic stirring device by 50 mm as described in the effect of the electromagnetic stirring device.
  • the uniform thickness of the long side wall will be further supplementarily described.
  • the so-called electromagnetic brake device may also be used together with the electromagnetic stirring device. That is, an electromagnetic brake device which is disposed below the electromagnetic stirring device and which applies the direct current magnetic field having a magnetic flux density distribution which is uniform in the casting mold width direction along the long side walls of the casting mold, in the casting mold thickness direction along the short side walls of the casting mold may further be included.
  • the uniform magnetic flux density means that a variation in the magnetic flux density in the length dimensions of the coil parts of the electromagnetic brake devices is within ⁇ 30% of the average thereof.
  • the amount of bubbles and the like included in the cast piece which is casted can be reduced and thus the quality of the cast piece can be enhanced.
  • FIG. 1 is an explanatory view schematically showing the configuration of the vicinity of a casting mold of a continuous casting apparatus 1 for steel according to this embodiment in plan view
  • FIG. 2 is an explanatory view schematically showing the cross-section of the same in front view
  • FIG. 3 is an explanatory view schematically showing a cross-section of the same in side view.
  • the continuous casting apparatus 1 includes a casting mold 2 which is, for example, substantially rectangular in plan view as illustrated in FIG. 1 .
  • the casting mold 2 includes a pair of long side walls 3a and 3b and a pair of short side walls 4a and 4b. All of the long side walls 3a and 3b and the short side walls 4a and 4b are configured of copper sheets, and on the outsides thereof, back plates 5a, 5b, 6a, and 6b made of austenitic stainless steel, which are non-magnetic bodies and reinforce the long side walls 3a and 3b and the short side walls 4a and 4b are disposed.
  • the back plate 5a is disposed on the outside of the long side wall 3a
  • the back plate 5b is disposed on the outside of the long side wall 3b
  • the back plate 6a is disposed on the outside of the short side wall 4a
  • the back plate 6b is disposed on the outside of the short side wall 4b.
  • electromagnetic stirring devices 7a and 7b which respectively include electromagnetic coils are disposed on the outsides of the back plates 5a and 5b.
  • electromagnetic brake devices 8a and 8b are disposed immediately below the electromagnetic stirring devices 7a and 7b. That is, the electromagnetic stirring device 7a and the electromagnetic brake device 8a are disposed on the outside of the back plate 5a, and the electromagnetic brake device 8a is disposed immediately below the electromagnetic stirring device 7a. In addition, the electromagnetic stirring device 7b and the electromagnetic brake device 8b are disposed on the outside of the back plate 5b, and the electromagnetic brake device 8b is disposed immediately below the electromagnetic stirring device 7b.
  • the length (casting thickness) when the short side walls 4a and 4b are seen in plan view is, for example, about 50 mm to 300 mm.
  • This length is determined depending on a desired cast piece width, and is about 50 mm to 80 mm in a case of a thin width cast piece, is about 80 mm to 150 mm in the case of an intermediate width cast piece, and is about 150 mm to 300 mm in the case of a typical width cast piece.
  • a horizontal direction (the X direction in FIGS. 1 to 3 ) along the long side walls 3a and 3b is referred to as a casting mold width direction
  • a horizontal direction (the Y direction in FIGS. 1 and 3 ) along the short side walls 4a and 4b is referred to as a casting mold thickness direction.
  • curved portions 11a and 11b which are convexly curved toward the electromagnetic stirring devices 7a and 7b are respectively formed.
  • the curved portions 11a and 11b are formed at positions facing a submerged entry nozzle 21 provided in the casting mold 2 which will be described later.
  • the parts corresponding to the curved portions 11a and 11b are molded so as not to be different from the straight parts on both adjacent sides thereof but to have a uniform thickness in the horizontal direction.
  • the curved portions 11a and 11b are formed in the long side walls 3a and 3b by, for example, press forming.
  • the curved portion 11a is formed to include an internal surface 11a1 which is curved so that the internal wall surface of the long side wall 3a is separated from the submerged entry nozzle 21, and an external surface 11a2 which is curved so that the external wall surface of the long side wall 3a is separated from the submerged entry nozzle 21.
  • the curved portion 11b is formed to include an internal surface 11b1 which is curved so that the internal wall surface of the long side wall 3b is separated from the submerged entry nozzle 21, and an external surface 11b2 which is curved so that the external wall surface of the long side wall 3b is separated from the submerged entry nozzle 21.
  • each of external surfaces of the long side walls 3a and 3b is convexly curved toward the electromagnetic stirring devices 7a and 7b in the external surfaces 11a2 and 11b2 included in the curved portions 11a and 11b.
  • the uniform thickness of the long side walls 3a and 3b will be supplementarily described.
  • the back plates 5a and 5b have parts in which the center internal surfaces thereof have shapes that are convexly curved toward the electromagnetic stirring devices 7a and 7b so as to fit the curved shapes of the external surfaces 11a2 and 11b2 of the curved portions 11a and 11b of the long side walls 3a and 3b.
  • the external surfaces of the back plates 5a and 5b that is, the surfaces thereof that face the electromagnetic stirring devices 7a and 7b are molded to be flat (flat surfaces).
  • a cooling water flow channel used to cool the long side wall made of copper is formed therein.
  • groove-like flow channels are formed on the surfaces (the internal surfaces) of the back plates 5a and 5b on the sides that come into contact with the long side walls 3a and 3b, thereby easily forming the cooling water flow channel. That is, by assembling the back plates 5a and 5b having the groove-like flow channels formed on the internal surfaces so that the internal surfaces come into close contact with and overlap the external surfaces of the long side walls 3a and 3b, the groove-like flow channels can be easily formed.
  • the curved portions 11a and 11b are formed to face the submerged entry nozzle 21 from the upper end positions of the long side walls 3a and 3b in a downward direction as illustrated in FIGS. 2 and 3 .
  • Each of the lower end positions of the curved portions 11a and 11b may be formed to be at the same height as the lower end position of the submerged entry nozzle 21 or to be lower than the lower end position of the submerged entry nozzle 21.
  • curved regions 9a and 9b are respectively formed as illustrated in FIG. 1 .
  • the curved portions 11a and 11b have shapes in which the curved parts gradually disappear toward their lower ends (that is, depressions that form the curved portions 11a and 11b gradually become shallow and disappear).
  • the boundary line between the curved portion 11a and the other flat part is a straight line (a straight line SL horizontal along the X direction in FIG. 4 ) parallel to the length direction of the long side wall 3a at the lower end part of the curved portion 11a and is a straight line (a straight line VL in the extension direction along the Z direction in FIG. 4 ) parallel to the height direction of the long side wall 3a at both side edge parts of the curved portion 11a.
  • the shortest horizontal distances L between the tops of the curves (the most depressed points) and the peripheral surfaces of the submerged entry nozzle 21 have tapered shapes in which the depressions gradually become shallow and disappear toward the lower ends of the curved portions 11a and 11b, and thus the lengths thereof in the height direction vary.
  • the shortest horizontal distance L is set to be 30 mm to 80 mm.
  • the shortest horizontal distance L is preferably 50 mm to 75 mm.
  • the shortest horizontal distances L between the tops of the curves of the curved portions 11a and 11b and the peripheral surfaces of the submerged entry nozzle 21 are set to be 30 mm to 80 mm in a range H from the positions of the lower end portions of the electromagnetic stirring devices 7a and 7b to heights higher than the upper end portions of the electromagnetic stirring devices 7a and 7b by 50 mm.
  • the length of h in FIG. 5 is 50 mm.
  • Depths D of the depressions that form the curved portions 11a and 11b for ensuring 30 mm to 80 mm as the shortest horizontal distances L between the tops of the curves of the curved portions 11a and 11b and the peripheral surfaces of the submerged entry nozzle 21 depend on the thicknesses of the long side walls 3a and 3b.
  • the depths D of the depressions may be appropriately set.
  • As the upper limit of the depth D of the depression 50 mm or less, and preferably 40 mm or less, are exemplary examples.
  • As the lower limit of the depth D of the depression 5 mm or greater and preferably 10 mm or greater are exemplary examples.
  • the depth D is preferably 10 mm to 40 mm.
  • a discharge flow 23 discharged from each of the discharge holes 22 includes Ar gas bubbles blown to clean nozzles, alumina or slag-based inclusions, and the like.
  • the bubbles and inclusions rise to the vicinity of a meniscus 24.
  • a molten powder 25 having molten oxides is supplied by a supply mechanism (not illustrated).
  • Each of the electromagnetic stirring devices 7a and 7b has the electromagnetic coil, and receives an alternate current power supplied from a power supply (not illustrated) and generates an electromagnetic force, thereby applying a thrust to the molten steel M at the upper portion of the casting mold 2.
  • the molten steel M to which the thrust is applied horizontally swirls around the submerged entry nozzle 21 in the casting mold 2 and generates a stirring flow that stirs the molten steel M.
  • the stirring flow By the stirring flow, the inclusions, the bubbles, and the like in the vicinity of the meniscus 24 at the upper portion of the casting mold 2 are prevented from being trapped by the solidified shell 26 formed on the side surfaces of the casting mold 2.
  • the electromagnetic brake devices 8a and 8b which are respectively disposed below the electromagnetic stirring devices 7a and 7b and include electromagnets and the like may apply a direct current magnetic field having a substantially uniform magnetic flux density distribution in the casting mold width direction (the X direction in FIGS. 1 and 2 ) along the long side walls 3a and 3b of the casting mold 2 to the discharge flows 23 of the molten steel M immediately after being respectively discharged from the discharge holes 22 in the casting mold thickness direction (the Y direction in FIGS. 1 and 2 ) along the short side walls 4a and 4b of the casting mold 2.
  • the direct current magnetic field and the discharge flows 23 of the molten steel M respectively discharged from the discharge holes 22 an induced current is generated in the casting mold width direction (the X direction in FIGS.
  • the uniform magnetic flux density means that a variation in the magnetic flux density in the length dimensions of the coil parts of the electromagnetic brake devices 8a and 8b is within ⁇ 30% from the average thereof.
  • the continuous casting apparatus 1 is configured as described above. Next, a continuous casting method of the molten steel M using the continuous casting apparatus 1 will be described.
  • the molten steel M is discharged into the casting mold 2 from each of the discharge holes 22 of the submerged entry nozzle 21.
  • the molten steel M is discharged obliquely downward such that the discharge flows 23 directed from the discharge holes 22 toward the short side walls 4a and 4b of the casting mold 2 are formed.
  • the discharge flows 23 include the Ar gas bubbles and the other inclusions, and they are suspended in the molten steel M within the casting mold 2 and rise by the buoyancy due to a difference in the specific gravity between the bubbles and inclusions, and the molten steel M.
  • the electromagnetic brake devices 8a and 8b may be operated at the same time as when the molten steel M is discharged from the submerged entry nozzle 21.
  • counter flows in the opposite direction to the flows of the discharge flows 23 are formed in the molten steel M.
  • the bubbles and the other inclusions in the discharge flows 23 rise to the vicinity of the meniscus 24 from the vicinity of the submerged entry nozzle 21 by the counter flows.
  • the electromagnetic stirring devices 7a and 7b are operated. Therefore, as described above, the stirring flow is formed in the molten steel M in the vicinity of the meniscus 24 within the casting mold 2 due to the electromagnetic stirring by the electromagnetic force.
  • the Ar gas bubbles and the like that rise to the vicinity of the meniscus 24 by riding on the counter flows described above are swirled by the stirring flow and are incorporated into, for example, the molten powder 25 having the molten oxides without being trapped by the solidified shell 26 of the casting mold 2 so as to be removed.
  • the curved portions 11a and 11b are respectively formed at the center positions of the upper portions of the long side walls 3a and 3b of the casting mold 2, the curved regions 9a and 9b are formed between the curved portions 11a and 11b and the submerged entry nozzle 21.
  • the long side walls 3a and 3b also include the curved portions 11a and 11b and have the uniform thickness, the magnetic flux density of the electromagnetic force applied to the molten steel M by the electromagnetic stirring devices 7a and 7b is at the same degree in both (1) the molten steel M that flows in the curved regions 9a and 9b and (2) the molten steel M that linearly flows at positions other than the curved regions 9a and 9b.
  • the stirring flow having a uniform flow velocity can be formed along the flow direction of the molten steel M. Accordingly, a flow disturbance or a stagnant zone is prevented from occurring in regions (the regions 112 and 113 in the related art described with reference to FIG. 7 ) on the downstream sides of the stirring flow in the long side walls 3a and 3b. Therefore, it is possible to suppress trapping of bubbles and the like by the solidified shell due to the occurrence of the stagnant zone.
  • the long side walls 3a and 3b including the curved portions 11a and 11b have a uniform thickness at each position, the thicknesses of the back plates 5a and 5b at the parts corresponding to the curved portions 11a and 11b are thin, and thus the magnetic flux density becomes non-uniform to that extent.
  • the electromagnetic field during the electromagnetic stirring is generally an alternate current magnetic field, the electromagnetic field is attenuated in conductors, and the attenuation particularly becomes intensive as the electrical conductivity is increased.
  • this type of the back plates 5a and 5b is made of non-magnetic austenitic stainless steel, the electrical conductivity thereof is much smaller than that of the long side walls 3a and 3b made of copper. Therefore, even though the thicknesses of the back plates 5a and 5b are partially thin, the effect thereof is rarely present, and the uniform magnetic flux density can be obtained even in the molten steel M that flows in the curved regions 9a and 9b.
  • the inventors had actually measured and examined the magnetic flux density using a gaussmeter and found the following. That is, in a case where the continuous casting apparatus 1 was viewed along the height direction, the magnetic flux density at the center position of the height of the electromagnetic stirring device 7a and at a point of 10 mm toward the submerged entry nozzle 21 from the top of the curve of the curved portion 11a of which the depression depth D was 30 mm was measured using the gaussmeter, and it was confirmed that the magnetic flux density varied by 10% or less even when compared to the magnetic flux density of the linear parts other than the curved portion 11a of the long side wall 3a.
  • the magnetic flux density at the same height of the continuous casting apparatus 1 was measured at a plurality of points, and the values were compared to each other. It was confirmed that the measurement value at the point corresponding to the curved portion 11a and the measurement values at the flat parts on both sides of the curved portion 11a had a difference of only about 10%.
  • the curved portion having a depression depth D of 30 mm was formed by cutting only a curved concave surface from the long side wall as in the related art and the thickness of the curved portion was thinned, it was confirmed that the magnetic flux density thereof was increased by about 40% from the magnetic flux density of the linear part of the long side wall. That is, similarly to the structure of the related art illustrated in FIG. 7 , the curved concave surface similar to that of the above-described example was formed only on the internal surface while the external surface of the long side wall was flat, and the magnetic flux density was measured to perform the same evaluation. As a result, it was confirmed that the measurement value at the point corresponding to the curved portion was higher than the measurement values at the flat parts on both sides of the curved portion by about 40%. Therefore, the effect of this embodiment could be confirmed by the foregoing point.
  • the shortest horizontal distances L between the tops of the curves of the curved portions 11a and 11 and the submerged entry nozzle 21 are set to 30 mm to 80 mm in the range H from the lower end portions of the electromagnetic stirring devices 7a and 7b to the positions higher than the upper end portions of the electromagnetic stirring devices 7a and 7b by 50 mm.
  • the flow velocity of the stirring flow that flows in the curved regions 9a and 9b is uniform, and a smooth and steady flow of the molten steel M can be ensured. Therefore, it is possible to sufficiently stir the molten steel M in the casting mold 2, and trapping of the bubbles and the like by the solidified shell 26 can be suppressed by the foregoing point.
  • the electromagnetic brake devices 8a and 8b are also used, the rising of the inclusions such as bubbles in the molten steel M is accelerated and the diffusion to the periphery thereof is suppressed. Therefore, trapping of the bubbles and the like by the solidified shell 26 can be further suppressed.
  • the shapes of the curved portions 11a and 11b are shapes in which the boundary between the curved portion 11a and the flat part of the periphery thereof is a straight line (the straight line SL along the X direction in FIGS. 2 and 4 ) parallel to the length direction of the long side wall 3a at the lower end part of the curved portion 11a and is a straight line (the straight line VL along the Z direction in FIGS. 2 and 4 ) parallel to the height direction of the long side wall 3a at both side parts of the curved portion 11a.
  • other shapes may also be employed as the shapes of the curved portions 11a and 11b. For example, as illustrated in FIG.
  • curved portion 11c having a so-called inverted bell shape in which the boundary line between the curved portion and the other flat parts is converged on a single point at the lowermost end as it goes to the lower end and disappears may be employed. That is, as illustrated in FIG. 6 , the curved portion 11c having a boundary line in a semi-elliptical shape that tapers to the lower portion in an opposed view of the long side wall 3a may be employed.
  • the electromagnetic stirring devices 7a and 7b having a height of 200 mm and a thrust of 100 mmFe were set so that the upper end positions thereof had the same height as the position of the meniscus, and the electromagnetic brake devices 8a and 8b which were disposed to apply the maximum magnetic flux density at a position having a depth of 500 mm down from the meniscus 24 were used.
  • the submerged entry nozzle 21 having a maximum outside diameter of 190 mm and an inside diameter of 100 mm was inserted into a molten steel submerged portion at a position having a depth of 400 mm down from the meniscus 24 along the vertical direction to perform casting.
  • the continuous casting apparatus 1 of this example included vertical portions having bend radiuses of 7.5 m and 2.5 m.
  • a low carbon aluminium-killed steel was casted at a casting rate of 2 m/min.
  • the discharge holes 22 of the submerged entry nozzle 21 faced the internal surfaces of the short side walls 4a and 4b in the space of the casting mold 2 and had a discharge angle ⁇ (see FIG. 2 ) of 30 degrees in the downward direction, and a two-hole nozzle having a hole diameter of 70 mm was used as the submerged entry nozzle 21.
  • the thicknesses of the long side walls 3a and 3b were constant at 30 mm, and a typical casting mold having parallel long side copper sheets and the center parts of the long side copper sheets were subjected to press forming, and the back plates 5a and 5b were cut to have depression depths D of 0,5, 10, 20, 30, 40, 50, and 55 mm at the position of the meniscus 24. That is, when the long side walls 3a and 3b were produced, rectangular copper sheets having a uniform thickness of 30 mm were prepared, press forming was performed on the center portions of the upper ends of the copper sheets, and accordingly, seven types of long side walls 3a and 3b having depression depths D of 0,5, 10, 20, 30, 40, 50, and 55 mm at the height position of the meniscus 24 were produced.
  • a depression depth D of 0 mm means a casting mold having a long side wall without depressions.
  • the curved portions 11a and 11b in the long side walls 3a and 3b were formed to have a length of 400 mm from the center of the casting mold width in the casting width direction to each of both sides, and as illustrated in FIG. 2 , the boundary between the curved portion 11a (11b) and the other flat part was, as the curved portion 11a (11b) goes to the lower end, a straight line parallel to the length direction (the X direction in FIG. 2 ) of the long side wall 3a at the lower end part of the curved portion 11a (11b) and was a straight line parallel to the height direction (the Z direction in FIG. 2 ) of the long side wall 3a at both side parts of the curved portion 11a, thereby forming a rectangular shape.
  • the long side walls 3a and 3b having the curved portions 11a and 11b were used as a part of the casting mold.
  • Bubbles and inclusion defects of a cast piece were evaluated by observing a part having a depth of 50 mm from the cast piece surface layer of the cast piece and counting the number of bubbles and inclusions having a diameter of 100 ⁇ m or greater as indexes.
  • the index of the number of Ar gas bubbles in Table 1 represents the ratio of the number of Ar gas bubbles in each condition with respect to the number of Ar gas bubbles which was set to 1 in a case where the distances L (see FIG. 5 ) between the curved portions 11a and 11b and the submerged entry nozzle 21 were 25 mm and the depression depth D was 0 mm, that is, the curved portions 11a and 11b were not formed on the long side walls 3a and 3b.
  • the index of the number of inclusions represents the ratio of the number of inclusions in each condition with respect to the number of inclusions which was set to 1 in a case where the distances L between the curved portions 11a and 11b and the submerged entry nozzle 21 were 25 mm and the depression depth D was 0 mm, that is, the curved portions 11a and 11b were not formed on the long side walls 3a and 3b.
  • the distances L between the curved portions and the submerged entry nozzle in Table 1 show dimensions at the lower end positions of the electromagnetic stirring devices 7a and 7b.
  • the depression depth D shows dimensions at the height position where the meniscus 24 is present.
  • Table 1 a result of operating only the electromagnetic stirring devices 7a and 7b without operating the electromagnetic brake devices 8a and 8b is shown in Table 1.
  • Table 1 Distance between curved portion and submerged entry nozzle L (mm) Depression depth of curved portion D (mm) Index of number of Ar gas bubbles Index of number of inclusions of casting mold parallel portion 25 0 1 1 25 5 1 1 30 5 0.6 1 40 10 0.4 1 50 20 0.2 1 60 30 0.2 1.1 70 40 0.2 1.2 80 50 0.2 1.3 85 55 0.2 2.0
  • the index of the number of Ar gas bubbles was 0.2 which is a low level.
  • the index of the number of inclusions was 1.3 which is also a low level.
  • the present invention is effective in supplying molten steel into a casting mold and producing a cast piece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP11875560.2A 2011-11-09 2011-11-09 Continuous casting device for steel Not-in-force EP2754513B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11875560T PL2754513T3 (pl) 2011-11-09 2011-11-09 Urządzenie do ciągłego odlewania stali

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/075868 WO2013069121A1 (ja) 2011-11-09 2011-11-09 鋼の連続鋳造装置

Publications (3)

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EP2754513A1 EP2754513A1 (en) 2014-07-16
EP2754513A4 EP2754513A4 (en) 2015-06-24
EP2754513B1 true EP2754513B1 (en) 2018-10-10

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US (1) US20140190655A1 (es)
EP (1) EP2754513B1 (es)
KR (1) KR20140053279A (es)
CN (1) CN103781572B (es)
BR (1) BR112014005417B1 (es)
CA (1) CA2844450C (es)
ES (1) ES2695045T3 (es)
PL (1) PL2754513T3 (es)
WO (1) WO2013069121A1 (es)

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JP6427945B2 (ja) * 2014-05-09 2018-11-28 新日鐵住金株式会社 ブルームの連続鋳造方法
JP6331757B2 (ja) * 2014-06-25 2018-05-30 新日鐵住金株式会社 鋼の連続鋳造用設備
EP3221070B1 (en) 2014-11-20 2020-06-03 ABB Schweiz AG Electromagnetic brake system and method of controllong molten metal flow in a metal-making process
WO2016159284A1 (ja) * 2015-03-31 2016-10-06 新日鐵住金株式会社 鋼の連続鋳造方法
CN108500228B (zh) * 2017-02-27 2020-09-25 宝山钢铁股份有限公司 板坯连铸结晶器流场控制方法
EP3590628B1 (en) * 2017-03-03 2022-05-18 Nippon Steel Stainless Steel Corporation Continuous casting method
WO2019164004A1 (ja) * 2018-02-26 2019-08-29 日本製鉄株式会社 鋳型設備
TW202003134A (zh) 2018-06-07 2020-01-16 日商日本製鐵股份有限公司 用於鋼之薄板鑄造的連續鑄造用設備及連續鑄造方法
TW202000340A (zh) * 2018-06-07 2020-01-01 日商日本製鐵股份有限公司 薄平板鑄造中的鑄模內流動控制裝置及鑄模內流動控制方法
JP7151247B2 (ja) * 2018-07-27 2022-10-12 日本製鉄株式会社 薄スラブ連続鋳造の流動制御装置及び薄スラブの連続鋳造方法
CN111676381B (zh) * 2020-06-22 2022-04-08 江苏江南铁合金有限公司 一种搅拌合金液的工艺
CN113001848B (zh) * 2021-02-24 2022-09-09 桂林恒保健康防护有限公司 一种厚度均匀的医用手套的制备方法
CN115194107B (zh) * 2022-07-13 2023-05-16 沈阳工程学院 控制金属液流动的多段位独立可调复合磁场装置及方法

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Also Published As

Publication number Publication date
EP2754513A4 (en) 2015-06-24
CN103781572A (zh) 2014-05-07
CA2844450C (en) 2017-08-15
US20140190655A1 (en) 2014-07-10
BR112014005417B1 (pt) 2019-07-02
CN103781572B (zh) 2016-09-07
EP2754513A1 (en) 2014-07-16
ES2695045T3 (es) 2018-12-28
CA2844450A1 (en) 2013-05-16
BR112014005417A2 (pt) 2017-04-04
PL2754513T3 (pl) 2019-03-29
KR20140053279A (ko) 2014-05-07
WO2013069121A1 (ja) 2013-05-16

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