JPH08112650A - Continuous casting method and pouring device for continuous casting - Google Patents

Abstract

PURPOSE: To easily restrain the development of drift flow of molten steel in a mold by reciprocatively moving an immersion nozzle in a horizontal direction at a specific random time interval in the case of pouring the molten steel into the mold from a tundish through the immersion nozzle. CONSTITUTION: The molten steel 2 in a ladle 1 is continuously poured into the tundish 3 from a nozzle 5, and the molten steel poured into the tundish 3 is poured into the water-cooling copper mold 6 through the immersion nozzle 7 positioned at a standard position. A molten steel level meter 15 is arranged in the mold to measure the molten steel level in the mold 6, and the measured information is transmitted to an arithmetic unit 16, and when the molten steel level becomes the setting range, the reciprocative movement in the horizontal direction of the preset opening hole adjusting plate and holding plate is started. In such a way, the development of drift of the molten steel in the mold is restrained by reciprocatively moving the immersion nozzle 7 in the holizontal direction at the random time interval being <=1/5 of drift developing period of the molten steel 2 in the mold 6 and the solidified shell 21s is stably formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing the drift of molten steel in a mold when the molten steel is poured into a mold from a tundish through a nozzle having a horizontal horizontal section and is continuously cast, and this method. The present invention relates to an injection device for continuous casting used for carrying out.

[0002]

2. Description of the Related Art Conventionally, in a fixed mold type continuous casting machine used for continuous casting in the field of steel, conceptually, as shown in FIG. 6, molten steel s is changed from ladle a to ladle nozzle b. To a tundish c via a tundish injection nozzle d and a sliding nozzle sn to pour into a water-cooled copper mold e and cool with this mold to solidify the shell ss.
Is produced, and the obtained slab sc is supported and carried out through a large number of support rolls r arranged below the mold. Ladle nozzle b and pouring nozzle d used here
In general, a hole having a smooth wall surface is used, and its position is usually fixed. (As a reference technique, there is Japanese Patent Application No. 58-159956.)

In this continuous casting, in order to stably generate a uniform solidified shell and obtain a slab of good quality, the flows sa and sb of the molten steel injected into the mold are as shown in FIG. 7 (a). In addition, it is preferable that the pattern be symmetrical (standard flow pattern).

However, using an immersion nozzle with a smooth hole wall,
When the position is fixed and molten steel is injected into the mold for continuous casting, periodic self-excited vibration of pressure occurs near the discharge holes.
For this reason, the ratio of the discharge flow rate of molten steel periodically fluctuates on both sides of the slab width direction. Inclusions (mainly alumina clusters) adhere asymmetrically to the wall surface of the hole, and in the case of an immersion nozzle, for example, the molten steel flow pattern in the mold becomes asymmetrical (uniform flow pattern).
The flow of the molten steel injected into the mold is, for example, as shown in FIG.
As shown in (b), non-regular drift sd, se, sf
Is likely to occur, a uniform solidified shell cannot be stably produced, and it becomes difficult to stably cast a slab of good quality.

It has also been proposed to adjust the position of the tundish when a drift occurs in the molten steel in the mold, but in order to move the heavy tundish containing the molten steel, a large movement is required. A device is required, and it is difficult to say that it is a sufficient method in terms of increasing the equipment cost and ensuring the accuracy of movement control.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a continuous casting method capable of simply suppressing the occurrence of drift of the molten steel flow in the mold when injecting it into the mold from a tundish through a dipping nozzle, and this method. The present invention provides a casting device for continuous casting suitable for carrying out.

[0007]

The first invention of the present invention is as follows:
When pouring molten steel into the mold from the tundish through the immersion nozzle, the immersion nozzle is moved horizontally in a reciprocating manner at random time intervals that are 1/5 or less of the uneven flow generation cycle of the molten steel in the mold to cause the molten steel flow in the mold. The continuous casting method is characterized by suppressing the occurrence of non-uniform flow.

A second aspect of the present invention relates to an apparatus for carrying out the first aspect of the invention, in which a supporting guide member is attached to the lower part of the tundish, and an opening communicating with a pouring hole of the tundish is provided in the supporting guide member. An opening adjusting plate having a hole and a holding plate equipped with an immersion nozzle communicating with the opening of the opening adjusting plate are arranged so as to be reciprocally movable in the horizontal direction by a moving device, respectively, and the opening adjusting plate and the holding plate are moved. The continuous casting pouring device is characterized in that the device is connected to a drive control device which is controlled via a computing device connected to the molten steel level meter in the mold.

A third aspect of the present invention is to inject molten steel into a mold from a tundish through a dipping nozzle, wherein the dipping nozzle is arranged at a central portion of the dipping nozzle at a random time interval of ⅕ or less of a drift generation cycle of the molten steel in the mold. And reciprocate up and down with
A continuous casting method, which is characterized by suppressing the occurrence of uneven flow of molten steel flow in the mold, the fourth invention, when injecting molten steel into the mold through the immersion nozzle from the tundish, the immersion nozzle, It is a continuous casting method characterized in that it reciprocates in the horizontal direction and in the vertical direction at random time intervals that are ⅕ or less of the uneven flow generation cycle in the mold to suppress the occurrence of uneven flow of the molten steel flow in the mold.

A fifth aspect of the present invention relates to an apparatus for carrying out the third aspect or the fourth aspect of the invention, in which a support guide member is attached to the lower part of the tundish,
An opening adjusting plate having an opening communicating with the pouring hole of the tundish and a holding plate having a relay nozzle communicating with the opening of the opening adjusting plate are reciprocated in the supporting guide member in a horizontal direction by a moving device. A dipping nozzle, in which the lower part of the relay nozzle is inserted into the upper nozzle hole, is movably arranged on the holding plate through a moving device, and is vertically reciprocally moved to move the opening adjusting plate and the holding plate. The continuous casting pouring device is characterized in that a drive control device controlled by an arithmetic device connected to a molten steel level meter in the mold is connected to the vertical movement device of the device and the dipping nozzle.

[0011]

In the present invention, the dipping nozzle is fixed in the horizontal direction at a random time interval of ⅕ or less of the drift generation period of the molten steel in the mold while the tundish is fixed during continuous operation.
It is possible to reciprocally move in the vertical direction, effectively suppress the uneven flow growth of the molten steel in the mold, stably generate the solidified shell, and obtain a slab of good quality.

Generally, in continuous casting, when a single immersion nozzle is used, the immersion nozzle is located at the center of the mold to try to prevent uneven flow in the molten steel flow injected into the mold as much as possible. As described above, drift is often generated.

The characteristic of the nonuniform flow phenomenon occurring in the molten steel in the mold varies depending on the type of cast steel, the mold conditions, and the casting conditions. For example, an example of the time course of the nonuniform flow index is shown in FIG. There are many cases that occur repeatedly in.

The drift index here is expressed by: drift index = {(right side molten metal height-left side molten metal height) / left / right average molten metal height from the reference position} × 100 (%).

The larger the variation range of the drift index, the higher the nonuniformity of the cooling rate in the mold, the more uneven the white band formation position in the solidified structure of the obtained slab, and the closer to the slab surface. When a white band is generated in some places, cracks often occur in that part. In order to prevent such slab cracking, it is necessary to set the drift index to a low value to reduce the amount of change.

The inventors of the present invention have studied the method therefor, and it is effective to change the position of the immersion nozzle in the horizontal direction and the vertical direction in order to change the situation of occurrence of non-uniform flow. In order to achieve this, it was found that it is effective to change the position of the immersion nozzle in the direction of canceling the drift.

However, it is difficult to accurately detect the occurrence of drift, and it is also difficult to accurately change the position of the immersion nozzle in real time. Therefore, the inventors of the present invention have conceived that the position of the immersion nozzle is changed in small increments on the plus side and the minus side in the vicinity of the standard position (random reciprocating movement at short time intervals), and the present invention has been completed.

In the present invention, in the case where the position of the immersion nozzle is changed in small steps from the positive side to the negative side in the vicinity of the standard position (reciprocating movement in a small cycle), the cycle is at least the above in order to minimize the growth of drift. Occurrence period C of drift
The following is preferably ⅕ (20 to 30 sec) or less of the drift generation period when the position of the immersion nozzle is fixed)
It is preferable to set within the range.

The reason for this is that if it exceeds 1/5, the cycle of drift generation becomes more and more unstable and uneven,
This is because if you try to suppress it, you will not be able to suppress it.

Further, it is preferable that the changing width of the position of the immersion nozzle is reciprocated within a range of ± 20 to 70 mm with respect to the standard position in the horizontal direction. ± 2 relative to standard position
If it is less than 0, the uneven flow suppressing effect is too small. If it exceeds 70 mm, the molten steel injection flow may become too close to the short side of the mold, and the solidified shell growth may become unstable.

Further, with respect to the vertical direction, it is preferable to reciprocate within a range of ± 10 to 30% with respect to the standard immersion depth of the immersion nozzle. If it is less than 10% of the standard immersion depth, the drift suppressing effect is small. If it exceeds 30% of the standard immersion depth, the molten steel flow will be greatly disturbed and it will be difficult to stably generate a solidified shell.

The position change (movement) speed of the submerged nozzle should be as high as possible in order to enhance the response of the drift suppression, but it is also restricted by the mechanism of the moving device, and the position control accuracy, the growth rate of the drift and the drift suppression effect. Set in consideration. This moving speed is 3 from the viewpoint of ensuring sufficient responsiveness for suppressing drift.
It is preferably 0 mm / sec or more.

The characteristic of the drift pattern is different depending on the cast steel type, the mold condition, the casting condition, and the casting condition. Therefore, the drift pattern and each of the above conditions for suppressing this drift are the cast steel type, the casting condition, and the casting condition. Set in advance based on experiments and achievements according to casting conditions.

[0024]

【Example】

(Embodiment 1) The present invention will be described below based on Embodiment 1 shown in FIG. This embodiment is a case where the present invention is adopted in a fixed mold type continuous casting machine, and here, the immersion nozzle has a configuration capable of reciprocating in both horizontal and vertical directions. In FIG. 1, 1 is a ladle,
Molten steel 2 refined in a converter (not shown) is housed and loaded onto a tundish 3 of a continuous casting machine. The ladle 1 is provided with a nozzle 5 whose opening is adjusted by a stopper 4.

Reference numeral 6 is a water-cooled copper mold, into which the tip of an immersion nozzle 7 disposed below the tundish nozzle 3 is inserted so as to be immersed in the molten steel 2 in the mold 6. There is. As shown in FIG. 2 and FIG. 3, the immersion nozzle 7 is vertically moved in the hole 7o with the lower part of the relay nozzle 8 horizontally reciprocally arranged below the tundish 3 inserted. Is reciprocally movable.

That is, the iron skin 3i at the bottom of the tundish 3
A support / guide member 9 is attached to the support / guide member, and an opening adjusting plate 10 having an opening 10o communicating with the pouring hole 3h at the bottom of the tundish 3 and a holding plate 11 fitted with the intermediate nozzle 8 are horizontally attached to the support / guide member. The opening adjusting plate 10 and the holding plate 11 are connected to the air cylinders 12 and 13, respectively. Therefore, the relay nozzle 8 can reciprocate in the horizontal direction together with the holding plate 11 by the operation of the air cylinder 13.

Further, the opening adjusting plate 10 is located between the pouring hole 3h at the bottom of the tundish and the upper end opening of the relay nozzle 8 and moves following the horizontal reciprocating movement of the relay nozzle 8 so that the tundish injection hole 3h and the relay joint. Even if the nozzle 8 is eccentric, the relay nozzle has a function of ensuring a predetermined injection amount, and also has a function of adjusting the injection amount to the relay nozzle 8.

The submerged nozzle 7 having the lower part of the intermediate nozzle 8 inserted therein is suspended from the holding plate 11 via air cylinders 14a and 14b, and is reciprocally movable in the horizontal direction together with the holding plate 11 by the operation of the air cylinder 13. It is reciprocally movable in the vertical direction by the operation of the air cylinders 14a and 14b.

Reference numeral 15 is a plurality of molten steel level gauges arranged at designated positions in the mold 6, for measuring the level of molten steel in the mold 6,
It is used for setting and correcting the horizontal reciprocating movement condition and the vertical reciprocating movement condition of the immersion nozzle 7.

Reference numeral 16 denotes an arithmetic unit, which controls an opening adjusting plate 10 and a holding plate 11 (intermediate joint nozzle) for suppressing the growth of drift of the molten steel in the mold according to the casting conditions and the molten steel level in the mold 6 from the molten steel level meter 14. 8 and the soaking nozzle 7) in the horizontal direction, the reciprocating width, the reciprocating cycle, and the reciprocating moving width, the reciprocating speed, and the reciprocating cycle of the soaking nozzle 7 are calculated, and each air cylinder is calculated. Calculate the amount of air supply to.

Reference numeral 17 is a setter for setting the calculation conditions in the calculation device. The drift pattern and the above-mentioned respective conditions for suppressing this drift are preliminarily tested and actualized by casting steel type, casting condition, mold condition and casting condition. It is set based on.

18 is the air cylinder 12, 13, 14
The drive control device for a and 14b controls the air supply to the air cylinders 12, 13, 14a, and 14b in response to a command from the arithmetic unit 16, and controls the opening adjusting plate 10 and the holding plate 1.
Controlling the horizontal reciprocating movement width (reciprocating movement speed), reciprocating movement time interval, and reciprocating movement time interval of the dipping nozzle 8 (relay nozzle 8 and dipping nozzle 7) and the reciprocating movement width in the up-and-down direction, reciprocating movement speed, and reciprocating time interval. can do. Reference numeral 19 is a mold vibrating device, and 20 is a large number of support rolls arranged in the lower part of the mold, which vertically-bend-horizontally support a cast piece 21 from the water-cooled copper mold 6.

In the fixed type continuous casting machine configured as described above, the molten steel 2 in the ladle 1 is continuously injected from the nozzle 5 into the tundish 3, and the molten steel injected into the tundish is standard. Immersion nozzle 7 positioned in position
And is poured into the water-cooled copper mold 6 via.

A molten steel level meter 15 is arranged in the mold, measures the molten steel level in the mold 6, sends this measurement information to a computing unit 16, and presets it when the molten steel level reaches a set region. Aperture adjusting plate 10 and holding plate 11
The horizontal reciprocating movement of the intermediate nozzle 8 and the immersion nozzle 7 and the vertical reciprocating movement of the immersion nozzle 7 are started.

As described above, by reciprocating the dipping nozzle horizontally and vertically in small increments, it is possible to suppress the occurrence of drift of the molten steel in the mold and to control the molten steel flow in the mold to the standard flow region. As a result, the molten steel flow in the mold is stabilized, the solidified shell 21s can be stably formed, and a slab of good quality can be stably cast. The slab thus obtained is vertically-curved-horizontally supported by a large number of support rolls 20 arranged in the lower part of the mold and continuously drawn out.

In this embodiment, the submerged nozzle is configured to reciprocate in the horizontal and vertical directions. However, even if the submerged nozzle is reciprocated only in the horizontal direction or only in the vertical direction, the drift is suppressed. It can be expected to have a corresponding effect.

Therefore, in the case of reciprocating movement only in the horizontal direction, the structure is not essential in which the intermediate nozzle is an immersion nozzle and the immersion nozzle and its reciprocating movement in the vertical direction. Further, when reciprocating only in the vertical direction, the structure of reciprocating in the horizontal direction of the immersion nozzle is not essential.

(Example 2) In the fixed mold type continuous casting machine shown in FIGS. 1 to 3, the outer diameter Do: 130 mm, the inner diameter D
i: 80 mm, length L: 900 mm, discharge nozzles 7a, 7b (downward angle θ: 150 degrees) were used to inject molten steel into the mold, and the molten steel level was measured with a molten steel level meter to determine the molten steel level. Is detected as a standard area, and the opening adjusting plate 10 and the immersion nozzle 7 are reciprocally moved in the horizontal direction (in this example, the immersion nozzle has a structure capable of reciprocating in the vertical direction. This structure was only used to adjust the vertical position.), Continuous casting was performed while suppressing the occurrence of drift of molten steel flow in the mold, and the white band formation situation in the obtained solidified structure of the slab was confirmed. investigated. This investigation of the white band formation situation is to see the degree of non-uniformity of the cooling rate due to the drift of the molten steel flow. The results are shown in Table 2 and FIG. 4 together with comparative examples and conventional examples.

Casting operation conditions Steel type: Medium carbon steel (component composition is shown in Table 1) Slab size: Width 1600 mm × thickness 250 mm Casting temperature: 1560 ° C. Casting speed: 2.0 m / min Molten steel supply: 8.3 ~ 16.6 liters / sec Tundish bottom opening diameter 80 mm Holding plate (immersion nozzle) Horizontal reciprocating movement Upper limit of moving time interval: Uneven flow of molten steel in the mold when the horizontal position of the immersion nozzle is fixed to the standard position When the cycle is set to 1, the ratio with respect to this non-uniform flow cycle Moving stroke: +/- side moving amount in the horizontal direction around the horizontal standard position of the immersion nozzle Average moving speed: 50 mm / sec

[0040]

[Table 1]

[0041]

[Table 2]

The movement stroke of the immersion nozzle is 20 to 70.
mm, the reciprocating cycle of the immersion nozzle is 1/5 of the drift generation cycle
In Nos. 1 to 4 and No. 9 which are up to 1/10, the variation with time of the drift index is as shown in FIG. 4, and this fluctuation range is significantly smaller than that of the conventional example shown in FIG. As shown in FIG. 5 (a), the generation state of the white band 22 of the solidified structure is as follows.
The fluctuation range of the distance x to was small, indicating that the cooling rate distribution was uniform and the solidified shell was stably generated.

On the other hand, in the case of the conventional example No. 10 in which the position of the immersion nozzle was fixed, the time-dependent change in the drift index showed results similar to those in FIG. 8 and the white band 22 of the obtained solidified structure of the cast slab was obtained. As shown in Fig. 5 (b), the variation of the distance x from the surface of the slab 21 to the white band 22 is large, and cracks 23 are generated at the portion where the white band is closest to the surface of the slab. Was recognized.

Further, the moving stroke of the immersion nozzle is 10
In the case of No. 5 which is as small as mm and in the case of No. 7 where the movement stroke of the immersion nozzle is as large as 100 mm, the upper limit of the movement time interval of the immersion nozzle is as large as 1/3 of the drift generation cycle
In each case, no remarkable improvement effect was recognized as compared with the conventional example.

(Embodiment 3) In the fixed mold type continuous casting machine shown in FIGS. 1 to 3, the inner diameter D1: 80 mm and the outer diameter D2.
: 130mm relay nozzle and outer diameter Do: 130mm, inner diameter Di: 80mm (upper opening diameter: 150mm), length L: 900mm, discharge holes 7a, 7b (downward angle θ: 1
Molten steel is injected into the mold, the molten steel level is measured with a molten steel level meter, it is detected that the molten steel level has become a standard region, and the immersion nozzle 7 is fixed to the center of the mold, It is reciprocally moved in the vertical direction (in this example, the immersion nozzle has a structure capable of reciprocating in the horizontal direction, but here, this structure merely adjusts the opening of the pouring hole 3h of the tundish 3 and It was made to function only in the horizontal alignment.), Continuous casting was carried out while suppressing the uneven flow growth of the molten steel flow in the mold, and the white band formation situation in the solidified microstructure of the obtained slab was investigated. This investigation of the white band formation situation is to see the degree of non-uniformity of the cooling rate due to the drift of the molten steel flow. Table 3 shows the results.

Casting operating conditions Steel type: Low carbon steel (composition composition is shown in Table 1) Slab size: Width 1600 mm x thickness 250 mm Casting temperature: 1560 ° C Casting speed: 2.0 m / min Molten steel supply: 8.3 ~ 16.6 l / sec Tundish bottom opening diameter 80 mm Vertical reciprocating movement of immersion nozzle Upper moving time interval upper limit: When the vertical position of the immersion nozzle is fixed to the standard position, the drift cycle of molten steel in the mold is set to 1 When this is done, the ratio to the non-uniform flow period Moving stroke: +/- side moving amount in the vertical direction centering on the vertical standard position of the immersion nozzle Average moving speed: 100 mm / sec

[0047]

[Table 3]

In No. 1 to 5 in which the vertical movement stroke of the immersion nozzle is 10 to 30% of the immersion depth and the reciprocating movement cycle of the immersion nozzle is 1/5 to 1/10 of the drift generation cycle, the drift index is The time-dependent change shows a result similar to that of FIG. 4, and the fluctuation range is significantly smaller than that of the conventional example shown in FIG. 8, and the white band 22 of the obtained cast slab solidified structure is obtained.
The generation status of is similar to that shown in FIG.
In all cases, the fluctuation range of the distance x from the surface of the cast slab 21 to the white band 22 was small, and it was shown that the cooling rate distribution was uniform and the solidified shell was stably generated.

On the other hand, in the case of the conventional example No. 10 in which the position of the dipping nozzle was fixed, the change over time of the drift index showed a result similar to that of FIG. 8, and the obtained white band 22 of the solidified structure of the cast slab was obtained. 5B shows a similar result to that of FIG. 5B. The fluctuation range of the distance x from the surface of the cast slab 21 to the white band 22 is large, and the crack 23 at the portion where the white band is closest to the surface of the cast slab. Was observed.

Further, the moving stroke of the immersion nozzle is 5%.
In case of No. 9 and small, the movement stroke of the immersion nozzle is 4
In the case of No. 8 which is as large as 0%, when the upper limit of the random moving time interval of the immersion nozzle is as large as 1/3 of the nonuniform flow generation period, in No. 7 there is no significant improvement effect compared to the conventional example. It was

In the above embodiment, the immersion nozzle is reciprocated only in the horizontal direction to suppress the uneven flow of molten steel in the mold, and the immersion nozzle is reciprocated only in the vertical direction to make the molten steel in the mold reciprocate. Although an example of continuous casting for suppressing the occurrence of non-uniform flow has been shown, continuous casting can be performed in which the immersion nozzle is reciprocally moved in the horizontal direction and the vertical direction to suppress the development of non-uniform flow of molten steel in the mold.

In this case, the reciprocating movement of the dipping nozzle in the horizontal direction and the reciprocating movement in the vertical direction are simultaneously or alternately performed, and are appropriately used according to the pattern of occurrence of the drift, and the timing of the use and the sharing (each reciprocating movement condition). Etc.) is set.

Further, the present invention is not applied only to a fixed mold type continuous casting machine, but a twin drum type continuous casting machine, a twin belt type continuous casting machine, a single belt type continuous casting machine, a moving mold type continuous casting machine. It is also applied to various continuous casting machines such as casting machines. Therefore, the structural conditions of the continuous casting nozzle of the present invention are changed within the scope of the claims according to the structural conditions of the continuous casting machine to which these are applied, the type of cast steel, the casting conditions, and the like.

[0054]

According to the present invention, the dipping nozzle is reciprocated in the horizontal direction, the vertical direction, or the horizontal direction and the vertical direction at random time intervals of ⅕ or less of the drift generation cycle of the molten steel in the mold during the continuous casting operation. By moving, it is possible to suppress the uneven flow of molten steel in the mold, stably generate a solidified shell, and stably cast a slab of good quality.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of a fixed mold type continuous casting machine according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic explanatory diagram of a main part in FIG.

FIG. 3 is a schematic cross-sectional view taken along the line Aa-Ab in FIG.

FIG. 4 is an explanatory diagram showing a change with time of a drift index in a mold in an example of the present invention.

FIG. 5 (a) is a schematic side view showing the state of white band formation in the solidification structure of the cast product obtained in the example of the present invention, and FIG. 5 (b) is the cast product obtained in the conventional example in which the nonuniform flow control is not performed. FIG. 3 is a side view schematic view showing a white band generation situation in the coagulated tissue of FIG.

FIG. 6 is a side cross-sectional schematic explanatory view showing an example of a conventional fixed casting type continuous casting machine for steel.

FIG. 7 (a) is a schematic side sectional view showing an example of a standard flow pattern of molten steel flow in a mold, and FIG.

FIG. 8 is an explanatory view showing a change over time in a mold drift index in a conventional fixed type continuous casting machine.

[Explanation of symbols]

 1 ladle 2 molten steel 2s vortex 3 tundish 3i iron skin 3h pouring hole 4 stopper 5 ladle nozzle 6 water-cooled copper mold 7 dipping nozzle 7o dipping nozzle hole 7a, 7b discharge hole 8 relay nozzle 9 support / guide plate 10 opening adjustment Plate 10o Opening 11 Holding plate 12, 13 Air cylinder 14a, 14b Air cylinder 15 Molten steel level meter 16 Computing device 17 Setting device 18 Drive control device 19 Mold vibration device 20 Support roll 21 Cast slab 21s Solidification shell 22 White band 23 Cracking

Claims (5)

[Claims] 1. When injecting molten steel into a mold from a tundish through a dipping nozzle, the dipping nozzle is horizontally reciprocated at random time intervals of ⅕ or less of a drift generation cycle of the molten steel in the mold. A continuous casting method, characterized in that the occurrence of uneven flow of molten steel flow in a mold is suppressed. 2. A support guide member is attached to a lower portion of the tundish, an opening adjusting plate having an opening communicating with a pouring hole of the tundish, and a soaking nozzle communicating with the opening of the opening adjusting plate. The holding plate with the
A drive control device, which is arranged so as to be reciprocally movable in the horizontal direction by a moving device, and is controlled by a moving device for the opening adjusting plate and the holding plate via a computing device connected to a molten steel level meter in the mold, respectively. A continuous casting pouring device characterized by being connected. 3. When injecting molten steel into the mold from the tundish through the immersion nozzle, the immersion nozzle is reciprocally moved in the vertical direction at random time intervals of ⅕ or less of the cycle of drift generation of molten steel in the mold. And a continuous casting method which suppresses the occurrence of uneven flow of the molten steel flow in the mold. 4. When injecting molten steel into the mold from the tundish through the immersion nozzle, the immersion nozzle is reciprocated in the horizontal and vertical directions at random time intervals of ⅕ or less of the cycle of occurrence of drift in the mold. And a continuous casting method which suppresses the occurrence of uneven flow of the molten steel flow in the mold. 5. A support guide member is attached to a lower portion of the tundish, an opening adjusting plate having an opening communicating with a pouring hole of the tundish, and a relay nozzle communicating with the opening of the opening adjusting plate. And a holding plate on which the lower part of the relay nozzle is vertically reciprocally arranged in the upper nozzle hole through the moving device. A drive control device controlled via a computing device connected to the molten steel level meter in the mold is connected to the moving device for the opening adjusting plate and the holding plate and the vertical moving device for the immersion nozzle. An injection device for continuous casting.