WO2018198181A1 - Procédé de coulée continue destiné à l'acier - Google Patents

Procédé de coulée continue destiné à l'acier Download PDF

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Publication number
WO2018198181A1
WO2018198181A1 PCT/JP2017/016326 JP2017016326W WO2018198181A1 WO 2018198181 A1 WO2018198181 A1 WO 2018198181A1 JP 2017016326 W JP2017016326 W JP 2017016326W WO 2018198181 A1 WO2018198181 A1 WO 2018198181A1
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WO
WIPO (PCT)
Prior art keywords
mold
magnetic field
molten steel
less
alternating magnetic
Prior art date
Application number
PCT/JP2017/016326
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English (en)
Japanese (ja)
Inventor
章敏 松井
裕計 近藤
菊池　直樹
Original Assignee
Ｊｆｅスチール株式会社
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
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to KR1020197030941A priority Critical patent/KR102324300B1/ko
Priority to EP17906929.9A priority patent/EP3597328B1/fr
Priority to JP2017555415A priority patent/JP6278168B1/ja
Priority to CN201780089980.9A priority patent/CN110573271B/zh
Priority to PCT/JP2017/016326 priority patent/WO2018198181A1/fr
Priority to BR112019022263-4A priority patent/BR112019022263B1/pt
Priority to TW107107611A priority patent/TWI690377B/zh
Publication of WO2018198181A1 publication Critical patent/WO2018198181A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—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
    • B22D11/10—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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/186—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means

Definitions

  • the present invention relates to a steel continuous casting method in which an alternating magnetic field is applied to molten steel in a mold, and the molten steel is continuously cast while controlling the flow of molten steel in the mold by the alternating magnetic field.
  • slab slabs oxide-based non-metallic inclusions
  • inclusions are formed on the surface layer and inside of the slabs.
  • Patent Document 1 an alternating magnetic field is applied to a discharge flow from an immersion nozzle immersed in molten steel in a mold, and the molten steel flow velocity on the molten steel surface in the mold is equal to or higher than the inclusion adhesion critical flow velocity, and the mold powder winding
  • a technique is disclosed in which a braking force or a horizontal rotational force is applied to the discharge flow so as to be in a range equal to or lower than the critical flow velocity.
  • Patent Document 2 the upper end of the AC magnetic field generator is positioned 20 to 60 mm below the surface of the molten steel in the mold, and a downward immersion nozzle of 1 to 30 ° is used. There is disclosed a method of continuously casting molten steel by controlling it to collide with a solidified shell in a range of 450 mm below the center.
  • Patent Document 3 when an alternating magnetic field generator applies a swirl stirring flow in the mold width direction to molten steel in a mold, the magnetic flux density at the discharge port of the immersion nozzle is 50% of the maximum magnetic flux density of the alternating magnetic field generator.
  • a method of continuously casting molten steel by disposing the discharge port at the following position is disclosed.
  • Patent Document 1 is a method of performing flow control by applying a braking force or a horizontal stirring force to the discharge flow from the immersion nozzle according to the value of the molten steel flow velocity at the molten steel surface in the mold. Some equipment for measuring or monitoring the molten steel flow velocity at the inner molten steel surface is required. In addition, there is a concern that the accuracy of the critical flow velocity prediction formula deteriorates when the installation position of the AC magnetic field generator installed on the back of the mold is changed, and the AC magnetic field generator installed at any position on the back of the mold It is hard to say that the technology is compatible with the above.
  • Patent Document 2 is a technique that focuses on the position where the discharge flow from the immersion nozzle collides, but is limited to the case where the AC magnetic field generator is installed near the molten steel surface in the mold, and the AC magnetic field generator is the mold. When it is installed relatively below the inner molten steel surface, it cannot cope.
  • Patent Document 3 is also limited to the case where the AC magnetic field generator is installed in the vicinity of the molten steel surface in the mold, as in Patent Document 2.
  • the discharge port of the immersion nozzle is installed at a position of 50% or less of the maximum magnetic flux density. In this case, since the discharge flow from the immersion nozzle is directed below the AC magnetic field generator, inclusions and the like are present. There is a concern that it may sink under the AC magnetic field generator and cause internal defects in the slab.
  • the present invention has been made in view of the above circumstances, and the object of the present invention is to apply an alternating magnetic field to molten steel in the mold from an alternating magnetic field generator installed across the long side of the mold and swirl the molten steel in the mold.
  • an alternating magnetic field generator installed across the long side of the mold and swirl the molten steel in the mold.
  • an appropriate AC magnetic flux density according to the distance from the molten steel surface in the mold to the peak position of the AC magnetic field and the immersion depth of the immersion nozzle is provided, thereby producing a high quality slab. It is to provide a continuous casting method of steel that can be manufactured.
  • the gist of the present invention for solving the above problems is as follows.
  • a solidified shell formed by solidifying the molten steel while injecting the molten steel into a continuous casting mold having a pair of mold long sides and a pair of mold short sides and forming a rectangular internal space
  • a steel continuous casting method for producing a slab by drawing from a steel An alternating magnetic field is applied to the molten steel in the mold via an alternating magnetic field generator disposed opposite to the long sides of the pair of molds on the back side of the pair of long mold sides, and the alternating magnetic field causes the molten steel in the mold to be horizontal.
  • a swirling stirring flow in the direction The interval between the mold long sides facing each other is set to 200 to 300 mm,
  • the discharge angle of the discharge hole of the immersion nozzle having two discharge holes for injecting molten steel into the internal space is in the range of 5 ° downward to 50 ° downward,
  • the frequency of the alternating magnetic field is 0.5 Hz to 3.0 Hz,
  • the distance from the molten steel surface in the mold to the peak position of the alternating magnetic field is 200 mm or more and less than 300 mm
  • the immersion depth of the immersion nozzle (distance from the molten steel surface in the mold to the upper end of the discharge hole of the immersion nozzle) is 100 mm or more and less than 200 mm, and
  • a continuous casting method of steel, wherein a magnetic flux density at a peak position of the AC magnetic field is 0.040T or more and less than 0.060T.
  • a steel continuous casting method for producing a slab by drawing from a steel An alternating magnetic field is applied to the molten steel in the mold via an alternating magnetic field generator disposed opposite to the long sides of the pair of molds on the back side of the pair of long mold sides, and the alternating magnetic field causes the molten steel in the mold to be horizontal.
  • a swirling stirring flow in the direction The interval between the mold long sides facing each other is set to 200 to 300 mm,
  • the discharge angle of the discharge hole of the immersion nozzle having two discharge holes for injecting molten steel into the internal space is in the range of 5 ° downward to 50 ° downward,
  • the frequency of the alternating magnetic field is 0.5 Hz to 3.0 Hz,
  • the distance from the molten steel surface in the mold to the peak position of the alternating magnetic field is 300 mm or more and less than 400 mm
  • the immersion depth of the immersion nozzle (distance from the molten steel surface in the mold to the upper end of the discharge hole of the immersion nozzle) is 100 mm or more and less than 300 mm, and
  • a continuous casting method of steel, wherein a magnetic flux density at a peak position of the AC magnetic field is 0.060 T or more and less than 0.080 T.
  • a steel continuous casting method for producing a slab by drawing from a steel An alternating magnetic field is applied to the molten steel in the mold via an alternating magnetic field generator disposed opposite to the long sides of the pair of molds on the back side of the pair of long mold sides, and the alternating magnetic field causes the molten steel in the mold to be horizontal.
  • a swirling stirring flow in the direction The interval between the mold long sides facing each other is set to 200 to 300 mm,
  • the discharge angle of the discharge hole of the immersion nozzle having two discharge holes for injecting molten steel into the internal space is in the range of 5 ° downward to 50 ° downward,
  • the frequency of the alternating magnetic field is 0.5 Hz to 3.0 Hz,
  • the distance from the molten steel surface in the mold to the peak position of the alternating magnetic field is 400 mm or more and less than 500 mm
  • the immersion depth of the immersion nozzle (distance from the molten steel surface in the mold to the upper end of the discharge hole of the immersion nozzle) is 100 mm or more and less than 300 mm, and
  • a continuous casting method of steel, wherein a magnetic flux density at a peak position of the AC magnetic field is 0.080 T or more and less than 0.100 T.
  • a steel continuous casting method for producing a slab by drawing from a steel An alternating magnetic field is applied to the molten steel in the mold via an alternating magnetic field generator disposed opposite to the long sides of the pair of molds on the back side of the pair of long mold sides, and the alternating magnetic field causes the molten steel in the mold to be horizontal.
  • a swirling stirring flow in the direction The interval between the mold long sides facing each other is set to 200 to 300 mm,
  • the discharge angle of the discharge hole of the immersion nozzle having two discharge holes for injecting molten steel into the internal space is in the range of 5 ° downward to 50 ° downward,
  • the frequency of the alternating magnetic field is 0.5 Hz to 3.0 Hz,
  • the immersion depth of the immersion nozzle (distance from the molten steel surface in the mold to the upper end of the discharge hole of the immersion nozzle) and the magnetic flux density at the peak position of the AC magnetic field generated by the AC magnetic field generator Is a continuous casting method of steel that satisfies any one of the following three conditions (A), (B), and (C).
  • an alternating magnetic field having an appropriate magnetic flux density according to the distance from the molten steel surface in the mold to the peak position of the alternating magnetic field and the immersion depth of the immersion nozzle is applied to give the swirl stirring flow to the molten steel in the mold. Therefore, capture of deoxidation products, argon gas bubbles and mold powder in the solidified shell is suppressed, and it is possible to easily manufacture a high-quality slab.
  • FIG. 1 is a view showing an example of an embodiment of the present invention, and is a schematic view of a mold part of a slab continuous casting machine.
  • FIG. 2 is an enlarged view of the immersion nozzle shown in FIG.
  • the present inventors applied an alternating magnetic field to the molten steel in the mold, and caused a swirling stirring flow in the horizontal direction to the molten steel in the mold by the alternating magnetic field, and the flow of molten steel in the mold in the continuous casting method of steel is low.
  • Tests and investigations were performed using a melting point alloy apparatus.
  • a submerged nozzle hereinafter referred to as “2” having a pair of mold long sides and a pair of mold short sides and using a mold that forms a rectangular inner space and having two discharge holes at the center of the inner space.
  • the peak position of the alternating magnetic field is the maximum value of the root mean square value per time period of the component perpendicular to the inner wall surface of the magnetic flux density of the alternating magnetic field on the inner wall surface of the mold surrounding the inner space of the mold. It is the maximum position along the wall.
  • the immersion depth of the immersion nozzle is defined as the distance from the molten steel surface in the mold (also referred to as “meniscus”) to the upper end of the discharge hole of the immersion nozzle.
  • the installation position of the AC magnetic field generator installed relative to the back of the long side of the mold and the installation position of the immersion nozzle, that is, the immersion depth were changed.
  • the flow velocity distribution and the like were investigated using numerical calculation and an actual 1/4 size low melting point alloy device.
  • the low melting point alloy a Bi—Pb—Sn—Cd alloy (melting point: 70 ° C.) was used.
  • the peak position of the alternating magnetic field is defined by the distance from the molten steel surface in the mold to the peak position of the alternating magnetic field.
  • the magnetic flux density is a direction from the plane forming the internal space of the mold copper plate in which the AC magnetic field generator is disposed behind the mold copper plate, toward the internal space along the normal direction of the plane.
  • the effective value (root mean square value) of the magnetic flux density at the peak position of the magnetic flux density along the slab drawing direction is , Defined by the arithmetic average value of values measured at an arbitrary pitch in the mold width direction.
  • the measurement pitch in the mold width direction is considered to be sufficient if it can sufficiently express the representativeness of the magnetic flux density spatial profile.
  • the swirl stirring force is weak, so that it is difficult to exert the cleaning effect from the argon gas bubbles and the solidified shell of the deoxidized product.
  • the swirl stirring force is too strong, which facilitates the entrainment of the mold powder.
  • the immersion depth of the immersion nozzle is less than 100 mm, since the distance between the molten steel surface in the mold and the discharge flow is too close, it is easy to promote the fluctuation of the molten metal surface in the mold. If the immersion depth is 200 mm or more, the immersion nozzle main body becomes longer, which increases the refractory cost, and the immersion nozzle is likely to be damaged in terms of heat resistance and load resistance. There is a concern that this will increase.
  • the peak position of the AC magnetic field is deeper than the molten steel surface in the mold as compared with the condition (A)
  • a magnetic flux density stronger than that in the condition (A) is required. That is, when the magnetic flux density is less than 0.060 T, the swirl stirring force is weak, so that it is difficult to exert a cleaning effect from the argon gas bubbles and the solidified shell of the deoxidized product.
  • the magnetic flux density is 0.080 T or more, the swirl stirring force is too strong, which facilitates the entrainment of the mold powder.
  • the immersion depth of the immersion nozzle is less than 100 mm, since the distance between the molten steel surface in the mold and the discharge flow is too close, it is easy to promote the fluctuation of the molten metal surface in the mold.
  • the immersion depth is 300 mm or more, the immersion nozzle main body becomes longer, which increases the refractory cost, and the immersion nozzle is easily damaged from the viewpoint of heat resistance and load resistance. There is a concern that this will increase.
  • the peak position of the alternating magnetic field is deeper from the molten steel surface in the mold than in the conditions (A) and (B), a stronger magnetic flux density is required. That is, when the magnetic flux density is less than 0.080 T, the swirl stirring force is weak, so that it is difficult to exert a cleaning effect on the solidified shell of the argon gas bubbles and the deoxidized product. On the other hand, when the magnetic flux density is 0.100 T or more, the swirl stirring force is too strong, and thus entrainment of the mold powder is promoted.
  • the immersion depth of the immersion nozzle is less than 100 mm, since the distance between the molten steel surface in the mold and the discharge flow is too close, it is easy to promote the fluctuation of the molten metal surface in the mold.
  • the immersion depth is 300 mm or more, the immersion nozzle main body becomes longer, which increases the refractory cost, and the immersion nozzle is easily damaged from the viewpoint of heat resistance and load resistance. There is a concern that this will increase.
  • the discharge angle of the immersion nozzle to be used is in the range of 5 ° downward to 50 ° downward.
  • the discharge angle is smaller than 5 ° downward, the AC magnetic field cannot be sufficiently applied to the discharge flow.
  • the discharge angle is larger than 50 ° downward, the downward flow of the discharge flow becomes too strong, so that the deoxidized products and gas bubbles will sink into deep positions in the casting direction and become internal defects. There is concern that it may become the starting point of cracking during molding.
  • the peak position of the alternating magnetic field is 200 mm or more and less than 500 mm from the molten steel surface in the mold.
  • the immersion depth of the immersion nozzle is shallower than the AC magnetic field peak position in order to cause the AC magnetic field to act on the discharge flow from the immersion nozzle. Therefore, operational restrictions occur, and an AC magnetic field cannot be efficiently applied.
  • the peak position of the alternating magnetic field is set at a position 500 mm or more away from the molten steel surface in the mold, a swirling stirring flow is applied in the region where the solidified shell has grown, and the deoxidized product and the argon gas bubbles The cleaning effect on the solidified shell becomes poor.
  • the frequency of the alternating magnetic field is 0.5 to 3.0 Hz, preferably 1.0 to 2.0 Hz. If the frequency is less than 0.5 Hz, the application of electromagnetic force by the alternating magnetic field becomes too intermittent, and the cleaning effect on the solidified shell of the deoxidized product and argon gas bubbles is not stable. On the other hand, when the frequency exceeds 3.0 Hz, the attenuation of the magnetic flux density due to the mold or the solidified shell increases, and the alternating magnetic field cannot be efficiently applied to the molten steel in the mold.
  • FIG. 1 is a diagram showing an example of an embodiment of the present invention, which is a schematic view of a mold part of a slab continuous casting machine
  • FIG. 2 is an enlarged view of an immersion nozzle shown in FIG.
  • reference numeral 1 is molten steel
  • 2 is a solidified shell
  • 3 is a molten steel surface in a mold
  • 4 is a discharge flow
  • 5 is a cast piece
  • 6 is a mold
  • 7 is a water-cooled mold long side
  • 8 is Water-cooled mold short side
  • 9 is an immersion nozzle
  • 10 is a discharge hole
  • 11 is an AC magnetic field generator
  • 12 is mold powder
  • ⁇ is the discharge angle of the immersion nozzle.
  • the mold 6 has a pair of opposed mold long sides 7 and a pair of opposed mold short sides 8 sandwiched between the mold long sides 7, and the pair of mold long sides 7 and the pair of mold short sides 8.
  • a rectangular internal space is formed.
  • a pair of AC magnetic field generators 11 are disposed so as to face each other with the mold long side 7 interposed therebetween.
  • the distance between the long sides of the opposite molds is 200 to 300 mm
  • the immersion nozzle 9 has two discharge holes 10, and the discharge angle ( ⁇ ) of the discharge holes 10 ranges from 5 ° downward to 50 ° downward. It is.
  • An immersion nozzle 9 is installed at the center of the rectangular internal space of the mold 6, and the discharge flow 4 of the molten steel 1 is discharged from the two discharge holes 10 toward the mold short side 8 to which each discharge hole 10 faces, Molten steel 1 is poured into the interior space of the mold 6.
  • the molten steel 1 injected into the inner space of the mold 6 is cooled by the mold long side 7 and the mold short side 8 to form the solidified shell 2.
  • the pinch roll (not shown) is driven with the discharge hole 10 immersed in the molten steel 1 in the mold to solidify the outer shell. Drawing of the slab 5 having the unsolidified molten steel 1 inside as the shell 2 is started.
  • the slab drawing speed is increased to a predetermined slab drawing speed while controlling the position of the molten steel surface 3 in the mold to a substantially constant position.
  • the immersion depth of the immersion nozzle 9 is indicated by “L 1 ”
  • the distance from the molten steel surface 3 in the mold to the peak position of the AC magnetic field is indicated by “L 2 ”.
  • the mold powder 12 is added on the molten steel surface 3 in the mold.
  • the mold powder 12 melts to prevent oxidation of the molten steel 1 and flows between the solidified shell 2 and the mold 6 to exert an effect as a lubricant.
  • the molten steel 1 flowing down the immersion nozzle 9 is mixed with argon gas, nitrogen gas or argon gas and nitrogen gas in order to prevent the deoxidation product suspended in the molten steel from adhering to the inner wall of the immersion nozzle. Inject gas.
  • an alternating magnetic field is applied from the alternating magnetic field generator 11 to the molten steel 1 in the mold, and a horizontal swirling stirring flow is generated in the molten steel 1 in the mold.
  • the frequency of the alternating magnetic field is 0.5 Hz to 3.0 Hz.
  • the immersion depth of the immersion nozzle 9 (L 1 ) is 100 mm or more and less than 200 mm, and the magnetic flux density at the peak position of the AC magnetic field is 0.040 T or more and less than 0.060 T.
  • the immersion depth (L 1 ) of the immersion nozzle 9 is set to 100 mm.
  • the magnetic flux density at the peak position of the alternating magnetic field is 0.060 T or more and less than 0.080 T.
  • the immersion depth (L 1 ) of the immersion nozzle 9 is set.
  • the magnetic flux density at the peak position of the AC magnetic field is set to 0.080T or more and less than 0.100T.
  • the adjustment of the magnetic flux density at the peak position of the AC magnetic field is performed as follows. That is, the relationship between the electric power supplied to the AC magnetic field generator 11 and the magnetic flux density at a position 15 mm away from the surface of the mold copper plate at the peak position of the AC magnetic field in the inner space of the mold 6 is measured in advance. The electric power supplied to the AC magnetic field generator 11 is adjusted so that the magnetic flux density at the peak position becomes the desired magnetic flux density.
  • an appropriate magnetic flux density according to the distance (L 2 ) from the molten steel surface 3 in the mold to the peak position of the AC magnetic field and the immersion depth (L 1 ) of the immersion nozzle. Since an alternating magnetic field is applied to give a swirl stirring flow to the molten steel in the mold, deoxidation products, argon gas bubbles, and trapping of the mold powder 12 into the solidified shell 2 are suppressed, and high-quality slab slabs are easily manufactured. Is realized.
  • the immersion depth (L 1 ) of the immersion nozzle and the distance (L 2 ) from the molten steel surface in the mold to the peak position of the AC magnetic field are variously changed.
  • a test for continuously casting about 300 tons of aluminum killed molten steel was conducted.
  • the thickness of the slab slab is 250 mm, the width is 1000 to 2200 mm, and the molten steel injection flow rate in the steady casting zone is 2.0 to 6.5 ton / min (1.0 to 3.0 m / min at the slab drawing speed) It was.
  • the frequency of the alternating magnetic field was 1.0 Hz.
  • the immersion nozzle used was a two-hole immersion nozzle having a discharge angle ( ⁇ ) of 25 ° downward, and argon gas was blown into the molten steel flowing down the immersion nozzle through the upper nozzle.
  • the cast slab slab was sequentially subjected to hot rolling, cold rolling, and galvannealing treatment. Surface defects in this alloyed hot-dip galvanized steel sheet were continuously measured with an on-line surface defect measuring device. Observe the observed defects, perform SEM analysis and ICP analysis, identify steelmaking defects (deoxidation product defects, argon gas bubble defects, mold powder defects) among the measured defects, and alloying and melting Evaluation was made by the number of steelmaking defects (product defect index) per 100 m length of the galvanized steel sheet.
  • test results corresponding to the examples of the present invention are shown in Table 2, and the test results corresponding to the comparative examples are shown in Table 3.
  • Invention Examples 1 to 12 correspond to the conditions (A) in Table 1
  • Invention Examples 13 to 24 correspond to the conditions (B) in Table 1
  • Invention Examples 25 to 36 correspond to the conditions in Table 1.
  • Each of Inventive Examples 1 to 36 had a product defect index in the range of 0.21 to 0.34 / 100 m, which was a good result.
  • Comparative Examples 1 to 24 were tests in which the magnetic flux density at the peak position of the AC magnetic field was outside the range of the present invention, and the product defect index was inferior at 0.46 to 0.55 / 100 m.
  • Comparative Examples 25 to 32 are tests in which the immersion depth (L 1 ) of the immersion nozzle is out of the range of the present invention, and the product defect index is also inferior at 0.47 to 0.55 / 100 m. It was. Comparative Examples 25 to 32 are only cases where the distance (L 2 ) from the molten steel surface in the mold to the peak position of the AC magnetic field corresponds to the condition (A) in Table 1, but the conditions (B) and (C ), It has been confirmed that the product defect index deteriorates when the immersion depth (L 1 ) of the immersion nozzle is outside the range of the present invention.
  • the same effect as that described in this example can be obtained when the thickness of the slab is in the range of 200 to 300 mm.
  • the shape of the immersion nozzle is not limited to the conditions described in this embodiment, and the same effect can be obtained if the discharge angle ( ⁇ ) is in the range of 5 ° downward to 50 ° downward. Have confirmed.

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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un procédé de coulée continue dans lequel un champ magnétique à courant alternatif est appliqué à de l'acier fondu dans un moule pour donner lieu à un écoulement d'agitation tourbillonnant de l'acier fondu dans le moule, une brame coulée de haute qualité est produite en appliquant une induction magnétique à courant alternatif appropriée correspondant à une profondeur immergée d'une buse immergée et à la distance de la surface de l'acier fondu dans le moule à la position du champ magnétique à courant alternatif de crête. Dans le procédé de coulée continue destiné à de l'acier, selon la présente invention, un champ magnétique à courant alternatif est appliqué à l'acier fondu dans un moule au moyen d'un dispositif de génération de champ magnétique à courant alternatif installé à l'opposé d'une surface arrière d'une paire de côtés longs du moule, pour donner lieu à un écoulement d'agitation tourbillonnant dans une direction horizontale de l'acier fondu dans le moule. L'espacement entre les côtés longs opposés du moule est compris entre 200 et 300 mm ; un angle d'évacuation de trous d'évacuation dans la buse immergée, qui a deux trous d'évacuation, est compris dans la plage de 5° vers le bas à 50° vers le bas ; la fréquence du champ magnétique à courant alternatif est au moins égale à 0,5 Hz et au plus égale à 3,0 Hz ; et la profondeur immergée de la buse immergée et l'induction magnétique dans la position du champ magnétique à courant alternatif de crête généré par le dispositif de génération de champ magnétique à courant alternatif sont commandées en fonction de la position du champ magnétique à courant alternatif de crête devant être comprise dans des plages prescrites.
PCT/JP2017/016326 2017-04-25 2017-04-25 Procédé de coulée continue destiné à l'acier WO2018198181A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
KR1020197030941A KR102324300B1 (ko) 2017-04-25 2017-04-25 강의 연속 주조 방법
EP17906929.9A EP3597328B1 (fr) 2017-04-25 2017-04-25 Procédé de coulée continue destiné à l'acier
JP2017555415A JP6278168B1 (ja) 2017-04-25 2017-04-25 鋼の連続鋳造方法
CN201780089980.9A CN110573271B (zh) 2017-04-25 2017-04-25 钢的连续铸造方法
PCT/JP2017/016326 WO2018198181A1 (fr) 2017-04-25 2017-04-25 Procédé de coulée continue destiné à l'acier
BR112019022263-4A BR112019022263B1 (pt) 2017-04-25 2017-04-25 Método de fundição contínua de aço
TW107107611A TWI690377B (zh) 2017-04-25 2018-03-07 鋼之連續鑄造方法

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PCT/JP2017/016326 WO2018198181A1 (fr) 2017-04-25 2017-04-25 Procédé de coulée continue destiné à l'acier

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KR (1) KR102324300B1 (fr)
CN (1) CN110573271B (fr)
BR (1) BR112019022263B1 (fr)
TW (1) TWI690377B (fr)
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JP6278168B1 (ja) 2018-02-14
KR20190127894A (ko) 2019-11-13
JPWO2018198181A1 (ja) 2019-06-27
TWI690377B (zh) 2020-04-11
BR112019022263B1 (pt) 2022-08-23
BR112019022263A2 (pt) 2020-05-19
CN110573271A (zh) 2019-12-13
KR102324300B1 (ko) 2021-11-09
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