JPH09174216A - Apparatus for continuously casting molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the high speed continuous casting operation and the improvement of surface characteristics and internal quality of a cast slab by impressing static magnetic fields to molten metal at the upper stage, middle stage and lower stage of a mold and restraining spouting flow of the molten metal in the mold from an immersion nozzle. SOLUTION: The flow of the molten metal 8 in the mold 1 from the immersion nozzle 2 is restrained to flow speed component in the vertical direction by impressing the static magnetic fields of the upper stage, middle stage and lower stage, and this flow component becomes the spouting flow 17A along the low intensity range of the static magnetic field and flows to almost the horizontal direction. When the casting speed becomes high, the colliding flow speed to short side walls of the mold becomes high, and in order to reduce this high flow speed, such control is executed that, e.g. the static magnetic field at the middle stage is made to the reverse direction to the magnetic fields at the upper stage and the lower stage to make the intensity of the static magnetic field high, or the intensity of the magnetic field is made to high while forming the magnetic poles at the upper stage, middle stage and lower stage to the same direction. By this method, the flow speed of the spouting flow 17A is restrained and the flow speed collided to the short side walls in the mold is restrained, and the remelting of solidified shell 10 at the middle stage position is prevented and the crack and the breakout of the cast slab 11 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when performing continuous casting of conductive molten metal, makes it possible to speed up the casting and to improve the property of the surface of the slab and the quality of the slab in order to properly flow the molten metal in the mold. Controllable device

[0002]

2. Description of the Related Art In continuous casting of molten metal, an injection method in which molten metal is discharged from a dipping nozzle into a mold is generally adopted.

FIG. 8 is a vertical cross-sectional view at the center of the short side of the mold, schematically showing the flow of molten metal in the continuous casting mold. As shown in the figure, in the continuous casting of the slab slab, in order to inject the molten metal 8 uniformly in the longitudinal direction of the mold, the molten metal 8 is discharged from the immersion nozzle 2 toward the short side wall 1B of the mold. When this discharge flow 17 impinges on the short side wall 1B of the mold, a secondary upflow 18 and a secondary downflow 20 are generated.

When the casting speed is increased, the injection amount of the molten metal per unit time is increased, so that the collision flow velocity of the discharge flow 17 with the short side wall 1B of the mold is increased, and the thickness of the solidified shell 10 is reduced. The risk of surface cracking or breakout of the slab 11 increases. Further, the flow velocity of the secondary descending flow 20 also increases, and non-metallic inclusions and an inert gas blown in for preventing nozzle clogging descend along with the flow, and are trapped as bubbles inside the slab. Furthermore, the secondary upflow 18 also strengthens, and the fluctuation of the meniscus flow 19 and the accompanying fluctuation of the molten metal surface increase, so that the molten powder 13 is caught immediately below the meniscus 9 and trapped in the vicinity of the slab skin, causing slab defects. Cause.

The non-metallic inclusions and air bubbles trapped in the slab 11 cause surface defects such as sliver flaws, bald flaws, and pinholes when they become cold-rolled coils.

As a measure against the above problems, the development of a technique for applying a braking force to a discharge flow of a molten metal from a dipping nozzle has been advanced by utilizing a static magnetic field.

For example, Japanese Patent Publication No. 2-20349 discloses a method and apparatus for applying a static magnetic field to a local position including a discharge flow of molten metal from an immersion nozzle. In this method, the flow rate of the discharge flow from the immersion nozzle can be slowed down, so that breakout of the slab can be prevented even during high-speed casting. However, when the static magnetic field is applied only to the discharge flow, strong ascending flow and descending flow that bypass the application region are generated, and it is not possible to obtain a sufficient effect for separating nonmetallic inclusions and bubbles from molten steel.

Japanese Patent Publication No. 5-55220 discloses a method and apparatus for applying a static magnetic field to the upper and lower two stages of the entire long side width of the mold, which does not include the molten steel discharge passage from the immersion nozzle.
In this method, the secondary ascending flow and the secondary descending flow caused by the molten steel discharge flow from the immersion nozzle colliding with the short side of the mold can be suppressed, so that non-metallic inclusions and bubbles can be effectively separated from the molten steel. However, the flow rate of molten steel discharged from the immersion nozzle colliding with the short side of the mold is high, and the possibility of remelting the solidified shell on the short side of the slab becomes large, which tends to lead to uneven thickness of the solidified shell. Is. If the collision flow velocity of the discharge flow becomes too high, the slab breaks out, so there is a limit to the increase in casting speed.

Japanese Unexamined Patent Publication (Kokai) No. 2-284750 discloses a method of applying a static magnetic field to the entire region of the long side of the mold including the discharge hole of the immersion nozzle, or the entire width of the long side of the mold above and below the discharge hole.
With the method of applying to the region including the discharge holes, precise flow control cannot be performed, and the same problem as the method described in Japanese Patent Publication No. 2-20349 occurs. In addition, the method of applying to the upper and lower regions of the discharge hole causes the same problem as the method described in Japanese Patent Publication No. 5-55220.

[0010]

An object of the present invention is to apply a static magnetic field to the molten metal in a mold effectively during continuous casting of molten metal to control the discharge flow of the molten metal from a dipping nozzle to achieve high speed. It is an object of the present invention to provide a continuous casting apparatus for molten metal capable of producing a slab having good surface properties and internal quality without causing breakout of the slab even under casting conditions.

[0011]

The gist of the present invention resides in the following continuous casting apparatus.

[0012] A continuous casting apparatus for controlling a discharge flow of a molten metal in a mold from a dipping nozzle by applying a static magnetic field to the molten metal in the mold. The upper, middle, and lower stages are divided into three stages, with magnets having U-shaped magnetic poles in a U shape when viewed from the casting direction at the outer surface of both side walls of the long sides of each stage, with magnets sandwiched between the molds. Continuous casting equipment installed in.

Upper part: upper part including meniscus but not including discharge flow path from immersion nozzle Middle part: middle part including discharge flow path from immersion nozzle Lower part: lower part not including discharge flow path from immersion nozzle The discharge flow passage is a flow passage until the molten metal discharged from the immersion nozzle when the static magnetic field is not applied collides with the short side wall of the mold.

The electromagnet used in the above apparatus may be one in which an iron core of a magnet is connected, or a permanent magnet may be used.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A continuous casting apparatus using the electromagnet of the present invention will be described.

FIG. 1 is a perspective view showing an example of a continuous casting apparatus in which the electromagnet of the present invention is arranged.

FIG. 2 is a vertical cross-sectional view of the cross section indicated by XX in FIG. 1 viewed from the short side of the mold.

In both figures, U-shaped iron cores 3B as seen from the casting direction are arranged in three stages of upper U, middle M and lower L outer surfaces of both side walls of the long side 1A of the mold 1, and the parallel cores A coil 3A is wound around the portion 3C to form a magnetic pole 3D that sandwiches the mold, and a pair of magnets 3 (electromagnets in the figure) that form a magnetic field are provided on both sides of the immersion nozzle.

In the electromagnet, coils 3A are respectively wound around two parallel portions 3C of a U-shaped iron core 3B, and a DC power source is connected via a variable resistor 5 as shown in FIG. Magnetic fields are formed in the direction of the short side of the mold by making the polarities of the magnetic poles facing each other across the short side of the slab differ. The magnetic field strength or magnetic field distribution can be changed by changing the magnitude or direction of the current supplied to each coil.

The above three-stage regions are determined based on the normal casting state in which no static magnetic field is applied. That is, as indicated by the broken line in FIG. 8 described above, the discharge flow 17 travels obliquely downward,
The flow path until it collides with the short side wall of the mold is defined as a "discharge flow path", and the middle stage M is set at a position including at least a part of this discharge flow path. The upper stage U is a region that does not include the discharge flow and is above it and that includes the meniscus 9 of the molten metal 8 in the mold, that is, a region that includes the meniscus flow 19. Lower row
L is a region below the middle stage, which does not include the discharge flow.

FIGS. 3A to 3D are views showing combinations in which the magnetic poles of the U-shaped magnet are changed.

4 (a) to 4 (d) are diagrams showing magnetic field line distributions and magnetic field intensities corresponding to the magnetic pole combinations shown in FIG. In both figures, (a) shows the case where the upper and lower stages have the same pole and the middle stage has a different pole, and the magnetic fields of the respective stages can be made stronger. (b) shows the case where the upper, middle, and lower stages have the same pole, and the magnetic field can be strengthened over all stages. (c) shows the case where the upper and middle stages have the same pole and the lower stage has the different pole, and the magnetic field in the meniscus portion can be made larger than that in the lower portion. (d) is the case where the middle and lower tiers have the same pole and the upper tier has different poles, and the magnetic field in the lower portion can be made larger than in the meniscus portion.

By arranging the electromagnets in this way, the distribution of the magnetic field can be arbitrarily set, and the flow control of the discharge flow from the immersion nozzle can be flexibly selected under various casting conditions. For example, as a method of setting each magnetic pole, the selection as shown in FIG. 3 can be made by selecting the direction of the current flowing through each coil.

The upper, middle and lower three-stage electromagnets are
It is also possible to connect iron cores in the height direction.

FIG. 5 is a side view (perspective view) of a continuous casting machine in which three-stage U-shaped electromagnets are arranged with their iron cores connected in the height direction, as viewed from the shorter side of the mold. In this case, the magnetic poles are arranged so that when the DC power supply is turned off by providing the power switch 6 on the electromagnet in the middle stage, the static magnetic field strength generated in the opposing middle-stage magnetic poles is generated in the upper and lower magnetic poles. Adjustable below the magnetic field strength (close to zero). Also, when the DC power supply is turned on and the coil current of the middle pole is increased,
The strength of the static magnetic field generated in the middle magnetic pole is increased, and it can be adjusted to be equal to or higher than the static magnetic field generated in the upper and lower magnetic poles.

FIG. 6 is a vertical cross-sectional view of the center of the short side of the mold for explaining the control of the discharge flow by the continuous casting apparatus for molten metal of the present invention. The range indicated by the broken line in the figure is the region of the upper tier U, the middle tier M, and the lower tier L set as described above. Magnetic fields are formed on both sides of the dipping nozzle 2 in opposite directions in the direction perpendicular to the plane of the drawing. Here, the discharge flow 17 from the immersion nozzle 2 is
It is decelerated by the action of the static magnetic field in the middle stage, and it turns to the horizontal direction.

The static magnetic field strength generated in each stage by the three-stage magnets installed outside the mold in the region of each stage is shown in FIG.
As shown in (a) to (d), adjustment can be made for each stage, whereby the flow of the molten metal discharged from the immersion nozzle can be appropriately controlled for each stage. For example, the magnetic field strengths of the three steps may be equal (Fig. 4 (b)),
The static magnetic field in the middle section may be weaker or stronger than that in the upper and lower sections (Fig. 4 (a)). By changing these conditions, different excellent effects can be obtained, as will be described later in detail in Examples.

The flow of the molten metal from the immersion nozzle in the mold is as shown in FIG. 6, when the static magnetic field is applied to the upper, middle and lower stages, the flow velocity component in the vertical direction is suppressed,
A discharge suppressing flow 17A is formed along a region where the static magnetic field strength is low, and flows in a substantially horizontal direction. At this time, if the strength of the middle static magnetic field is adjusted according to the casting speed, the horizontal discharge suppression flow 17A
The flow velocity and the flow passage range or flow passage area can be adjusted appropriately, and a secondary upflow 18 and a secondary downflow 20 are generated.

When the casting speed is increased, the collision flow velocity on the shorter side of the mold is increased, and in order to mitigate this, for example, the static magnetic field in the middle stage is made opposite to the magnetic fields in the upper and lower stages to increase the strength of the static magnetic field ( 4 (a)), or the upper, middle, and lower magnetic poles are oriented in the same direction to increase the strength of the static magnetic field (see FIG. 4 (b)). As a result, the flow velocity of the discharge suppressing flow 17A is suppressed, and as described above, the secondary upflow and the secondary downflow are generated.

When the flow velocity of the discharge suppressing flow 17A is suppressed, the flow velocity colliding with the side wall 1B of the short side of the mold is also suppressed, which prevents re-melting of the solidified shell 10 at the middle position and causes uneven shell thickness. It is possible to prevent the slab 11 from cracking or breakout.

The secondary ascending flow 18 rises substantially vertically upward in the region where the magnetic field strength is low, supplies heat to the solidified shell 10 and the molten powder 13 near the meniscus, and suppresses the rapid formation of the solidified shell. It raises the temperature of the molten powder and promotes the capture of impurities. In addition, the secondary upward flow is suppressed at the upper magnetic pole center line 14A where the static magnetic field strength is strongly adjusted, and the secondary upward flow is suppressed to the secondary upward flow 18A, and it changes horizontally in the vicinity of the meniscus 9 and there is no flow velocity fluctuation. This produces a meniscus flow 19. As a result, fluctuations in the molten metal surface are suppressed, and it is possible to prevent the molten powder 13 from being caught in the molten steel.

The secondary downward flow 20 generated by the ejection suppressing flow 17A colliding with the short side wall 1B of the mold descends almost vertically in the region where the magnetic field strength is low, and is weak at the position of the lower magnetic pole center line 16A (low flow velocity). ) The secondary downflow is 20A. As a result, the non-metallic inclusions and bubbles that are descending along with the secondary downward flow 20 are
It is possible to prevent it from entering the inside of 11 and being caught without ascending.

By arranging the magnetic poles so that the static magnetic field strength has the pattern shown in FIG. 4 (c), the meniscus flow velocity 19 can be reduced, the meniscus temperature deviation can be reduced, and the surface cleanliness of the slab can be improved. Further, when the magnetic poles are arranged so as to have the pattern shown in FIG. 4 (d), the flow rates of the secondary descending flow and the discharge suppressing flow are reduced, and the number of breakouts, non-metallic inclusions and bubbles can be reduced. .

Further, as shown in FIG. 5, the magnetic poles of the electromagnets in which the upper, middle and lower U-shaped magnets are vertically connected are strengthened by increasing the magnetic field strength in the middle stage and applying a strong braking force to the discharge flow. It is also possible to increase the casting speed.

As described above, according to the apparatus of the present invention, a predetermined flow can be formed in the molten metal in the mold while flexibly coping with the increase in casting speed. Then, even if the casting speed is increased, it is possible to manufacture a slab having good surface properties and internal quality without causing breakout of the slab.

Next, the apparatus of the present invention will be specifically described by way of examples.

[0037]

【Example】

(Example 1) The inner wall has a long side width of 1600 mm, a short side width of 270 mm,
A slab slab of low carbon aluminum killed steel was cast using a slab continuous casting machine equipped with a water-cooled copper mold having a height of 900 mm.
The withdrawal speed of the slab is 2 m / min (corresponding to a casting speed of 5.4 t / min). Two discharge holes of the immersion nozzle were provided on the side facing the short side of the mold. As the apparatus for controlling the flow of molten steel in the mold, an electromagnet having the U-shaped iron core shown in FIG. 1 arranged in three stages was used.

The parallel portion 3C of the three-stage electromagnet is
It was installed in each of the middle and lower regions. The maximum magnetic field strength was controlled to be 2200 gauss at the upper and lower stages, and the middle stage was controlled at -1000, 1000, and 3000 (Case Nos. 1, 2, and 3). The minus sign of the magnetic field strength in the middle tier means the direction opposite to the magnetic field application direction in the upper and lower tiers.

Comparative Example 1 is an example in which the flow of molten steel is controlled by a method of applying a static magnetic field to the upper and lower stages that do not include a discharge flow channel, and Comparative Example 2 is an example in which a static magnetic field is applied only to the middle stage.

The collision flow velocity at which the discharge flow collides with the short side wall of the mold is obtained by a flow analysis simulation when the static magnetic field strength in the middle stage is changed. The short-side collision flow velocity ratio was expressed as a relative value with the collision flow velocity obtained under the conditions of Case 2 of the example being 1.

The breakout index is represented by a relative value with the number of breakout occurrences occurring under the case 2 condition being 1.

The meniscus temperature deviation is obtained by measuring the temperature 10 mm directly below the meniscus at a half thickness position of the mold in the width direction, and measuring the maximum temperature Tmax, the minimum temperature Tmin, and the average temperature T.
It is a value calculated by [(Tmax-Tmin) / Tm] × 100 using m.

The inclusion index in the slab is 45 m from the slab surface.
The position of the m depth was measured by a microscope to measure the number of inclusions of 20 μm or more, and expressed as a relative value with the number of inclusions in Case 1 of the example being 1.

The bubble index in the slab is 45 mm from the slab surface.
The depth position was represented by a relative value with the number of bubbles in Case 1 of the example being 1, by measuring the number of bubbles of 50 μm or more in the cast piece with a microscope.

The surface cleanliness index is 10 mm from the surface of the slab.
For the area within, the number of inclusions of 20 μm or more was measured with a microscope and expressed as a relative value with the number of inclusions of Case 1 of the example being 1.

Table 1 shows the results of these measurements.

[0047]

[Table 1]

In case 1, case 2 and case 3 of the embodiment, a static magnetic field was applied to the upper, middle and lower stages to change the magnetic field strength of the middle stage. When the magnetic field strength in the middle stage is changed to −1000 gauss (case 1), 1000 gauss (case 2) and 3000 gauss (case 3), the mold short side collision flow velocity ratio becomes
Maximum in Case 2 (1000 gauss), which is 1
And And, the breakout index of the slab decreased to 0.75, 1.0 and 0.65 in proportion to the value of the short side collision flow velocity ratio. When a static magnetic field is applied to the middle stage, the short-side collision flow velocity can be suppressed, and when the middle stage magnetic field is strengthened in the direction opposite to the upper and lower magnetic field directions, and when strengthened in the same direction,
The short-side impingement flow can be further reduced (0.80 and 0.70). Further, the meniscus temperature deviation is 0.30 to 0.50, the secondary upward flow is also suppressed, and the meniscus flow is stable. Further, in each case, the secondary downflow is also suppressed, and nonmetallic inclusions, bubbles and surface cleaning are also good.

On the other hand, in Comparative Example 1 (Case 4 and Case 5), since the static magnetic field was not applied to the middle stage, it collided with the short side wall of the mold without suppressing the flow velocity of the discharge flow,
The flow velocity of the impinging flow, the secondary upflow and the secondary downflow on the short side wall of the mold increases. This collision velocity increases (In Cases 4 and 5, the collision velocity ratio to the short side wall of the mold is 1.4 and 1.
As a result, the breakout index increased to 3.0 and 2.5. In addition, the increase of the secondary upflow is advantageous in terms of heat supply to the vicinity of the meniscus and promotion of melting of the powder due to it, but a static magnetic field strength (2200 gauss) equivalent to that of the invention example is applied to the upper stage. In No. 4, the effect of suppressing the meniscus flow velocity and the temperature deviation are almost the same as those of the invention example.

In case 5 in which the static magnetic field strength in the upper part is lowered to 1200 gauss, the meniscus flow velocity further increases, and the meniscus temperature deviation increases to 0.80. The increase in the secondary downflow causes non-metallic inclusions and bubbles to enter the lower part of the molten metal inside the slab, and the inclusion number index in the slab is 2.5 and 3.5,
In addition, the bubble number indexes became 2.3 and 2.8, and the separation effect deteriorated. In case 5, the lower static magnetic field strength is 12
Since it was as low as 00 gauss, the effect of suppressing the flow velocity of the secondary downflow was inferior, the index of inclusions in the slab and the index of bubble number were increased, the surface cleanliness index was 2.6, and the surface properties were also poor.

In Comparative Example 2 (Cases 6, 7 and 8), the static magnetic field was applied only to the middle stage, and the magnetic field strengths of 1000, 2200 and
It was changed in 3 steps of 3000 gauss. The mold short-side collision flow velocity ratio was 1.2, 1.1, and 0.9, and gradually decreased in proportion to the magnetic field strength. However, since the static magnetic field is not applied to the upper stage, there is no suppression of the flow velocity of the secondary upflow, and the meniscus temperature deviation is 1.1 and 1.5.
And 1.8, which shows that the fluctuation of the meniscus flow velocity is increasing. Further, since the static magnetic field is not applied to the lower stage as well, the flow velocity of the secondary downward flow is also increased, and the inclusion number index, bubble number index and surface cleaning index are also increased.
The separation effect of non-metallic inclusions and bubbles deteriorated.

From the above results, the magnetic field distribution in case 1 is required when a steel with excellent properties is required depending on the steel type, and the magnetic field distribution in case 2 is required when the internal quality is required. The magnetic field distribution in Case 3 is appropriate when it is desired to increase the speed. As described above, by using the device of the present invention, it is possible to control the flow of the discharge flow from the immersion nozzle in accordance with the properties of the target slab.

From these results, by adjusting and controlling the static magnetic field strengths of the upper, middle and lower stages for each stage,
Even if the casting speed is increased, there is no breakout,
It is possible to manufacture a slab having excellent surface properties and internal quality.

(Example 2) A casting test was conducted using a continuous casting apparatus in which electromagnets having three U-shaped iron cores shown in FIG.

FIG. 7 is a diagram showing a magnet connecting the vertical portions of three U-shaped iron cores and the distribution of magnetic force lines. As shown in the figure, the upper and lower rows are 3000 gauss, and the middle row is
A magnetic field of 4000 gauss was applied, and casting similar to that of Example 1 was performed at a slab drawing speed of 3 m / min. As a result, it was possible to obtain a slab with excellent surface cleanliness without the occurrence of breakout.

[0056]

By using the apparatus of the present invention, the flow of the molten metal in the mold for continuous casting from the dipping nozzle can be properly controlled according to the casting speed. It is possible to achieve both effective separation of bubbles. Therefore, it becomes possible to cope with the increase in casting speed, and it is possible to manufacture a slab having good surface properties and internal quality. The present invention can be applied not only to casting of ordinary steel but also to continuous casting of non-ferrous metals such as stainless steel and copper.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a continuous casting apparatus in which an electromagnet of the present invention is arranged.

FIG. 2 is a vertical cross-sectional view of the cross section indicated by XX in FIG. 1 viewed from the short side of the mold.

FIG. 3 is a view showing a combination in which the magnetic poles of the U-shaped magnet are changed, and (a) shows the case where the upper and lower stages have the same pole and the middle stage has a different pole.
In (b), the upper, middle and lower poles have the same polarity, in (c), the upper and middle poles have the same poles, and in the lower pole, the lower poles have different polarities. It is a figure which shows the magnetic pole arrangement in the case.

FIG. 4 is a diagram showing a magnetic field line distribution and a magnetic field strength when the polarities of three steps are changed in the electromagnet of the present invention, (a) to (d)
FIG. 4 is a diagram showing magnetic field line distributions and magnetic field intensities corresponding to the combinations of magnetic poles shown in FIG. 3.

FIG. 5 is a side view on a short side of a mold showing an example of a continuous casting apparatus in which an electromagnet of the present invention in which vertical portions of three U-shaped magnets are connected is arranged.

FIG. 6 is a vertical cross-sectional view of the center of the short side of the mold, schematically showing the discharge flow of the molten metal from the immersion nozzle when the apparatus of the present invention is used.

FIG. 7 is a diagram showing a magnet arrangement and a magnetic force line distribution used in Examples.

FIG. 8 is a cross-sectional view of the center of a short side of a mold, schematically showing the flow of molten metal in a continuous casting mold in which a conventional magnetic field is not applied.

[Explanation of symbols]

 1. Mold 1A. Mold long side wall 1B. Short side wall of the mold 2. Immersion nozzle 2A. Discharge hole 3. Electromagnet 3A. Coil 3B. Iron core 4. E-type electromagnet 4-1. Upper electromagnet 4-2. Middle electromagnet 4-3. Lower electromagnet 4A. Coil 4B. E-type iron core 5. Variable resistor 6. Power switch 7. DC power supply 8. Molten metal 9. Meniscus 10. Solidification shell 11. Slab 12. Solid powder 13. Molten powder 14. Upper magnetic pole surface 14A. Upper magnetic pole center line 15． Middle pole surface 15A. Middle pole center line 16． Lower magnetic pole surface 16A. Lower magnetic pole center line 17． Discharge flow 17A. Discharge suppression flow 18. Secondary upflow 18A. Secondary upflow suppression 19． Meniscus style 20. Secondary downflow 20A. Secondary downflow

Claims (2)

[Claims] 1. A continuous casting apparatus for controlling a discharge flow of a molten metal in a mold from an immersion nozzle by applying a static magnetic field to the molten metal in the mold. Is divided into the following upper, middle, and lower stages, and the magnets with both magnetic poles in a U-shape when viewed from the casting direction are placed opposite to each other on the outer surface of both side walls of the long sides of the mold in each stage. A continuous casting device that is installed in three stages. Upper part: upper part that includes meniscus and does not include discharge flow path from immersion nozzle Middle part: middle part that includes discharge flow path from immersion nozzle Lower part: lower part that does not include discharge flow path from immersion nozzle However, discharge flow path Is the flow path until the molten metal discharged from the immersion nozzle when the static magnetic field is not applied collides with the short side wall of the mold. 2. An upper stage arranged on the outer surface of both side walls of the long side of the mold,
The continuous casting apparatus according to claim 1, wherein the middle and lower magnets are electromagnets whose iron cores are connected.