KR20090126625A - Tundish and continuous casting method using the same - Google Patents

Abstract

PURPOSE: A tundish for guiding flow of molten steel and a continuous casting method using the same are provided to control the flow of the molten steel using a gas emission unit and to improve the continuous casting quality. CONSTITUTION: A tundish for guiding flow of molten steel comprises a tundish main body(10) and a gas emission unit(20). The molten steel moves into the tundish main body. The gas emission unit is installed inside the tundish main body and squirts the gas to guide the movement of the molten steel. The gas emission unit includes a diffuser(30) and a gas supply line. The diffuser emits the supplied gas. The gas supply line supplies the gas to the diffuser and is installed inside the tundish main body.

Description

Molten steel flow-induced tundish and continuous casting method using the same

The present invention relates to a tundish in which molten steel is introduced from a ladle and supplies molten steel to a mold during continuous casting of the steelmaking process. More specifically, the flow of molten steel accommodated in the tundish is implemented as a gas upflow. Molten steel flow-induced tundish and continuous casting method using the same to prevent molten steel from hardening of the molten steel with smooth molten steel flow, as well as to increase the tundish residence time of molten steel and to effectively prevent the inclusion of molds by smooth inclusions. It is about.

In general, a continuous casting process in a steel mill that continuously produces slabs and the like is composed of one ladle, one tundish, and a player.

However, in the case of using such a ladle, the gate installed in the lower part of the ladle is opened to secure the discharge amount of the molten steel from the time when the level of the molten steel in the ladle is lowered, and the slag slag flows into the tundish. Is generated.

In addition, continuous casting requires replacement with new ladle filled with molten steel, and the supply of molten steel into the tundish is stopped during the replacement of the ladle, thereby causing a problem such as a rapid decrease in the tundish hot water surface.

Therefore, a technique has been proposed to solve the problems occurring in the continuous casting process using one such ladle.

That is, as shown in FIG. 1, two ladles 110a and 110b are used for continuous casting.

In the case of the continuous casting process using the two ladles 110a and 110b, a new second ladle 110b is applied to the tundish before the tundish supply of the molten steel M filled in one ladle 110a is completed. In order to solve the problem according to the ladle exchange described above, using the two ladles at the same time to facilitate the supply of molten steel (M) to the tundish (120).

For example, as shown in FIG. 1, when two ladles 110a and 110b are used, the molten steel can be smoothly supplied from the ladle to the tundish without the interruption of the molten steel supply to the tundish at the ladle replacement time. .

Therefore, in the case of FIG. 1, the molten steel bath surface level in the tundish 120 can be kept constant, and the molten steel discharge amount from the ladle is controlled by adjusting the tundish inflow rate of the molten steel from each ladle inlet 112a, 112b (nozzle). Can be kept to a minimum, which prevents inclusion of slag or the like in the ladle into the tundish 120.

In this case, reference numeral 122 in FIG. 1 is an immersion nozzle installed at a lower portion of the tundish and immersed in a mold, 130 is a mold of a continuous casting machine, and 132 is a cast steel cast in a mold.

However, the continuous casting process using the two ladles (110a, 110b) shown in Figure 1 is a situation that the following problems occur.

For example, since the tundish 120 during continuous casting using two ladles as shown in FIG. 1 requires two ladle inlets 112a and 112b to be placed in the tundish 120, the tundish shape is generally T It will have a child shape or H shape.

However, since the molten steel M is supplied to the tundish 120 only in one injection hole (for example, 112a) during the normal continuous casting process, as shown in FIG. 2A, the ladle injection hole 112a is supplied. The molten steel M does not flow to the opposite side of the tundish where the other ladle inlet 112b is located, and is discharged through the mold immersion nozzle 132 disposed at the center of the tundish.

Therefore, the molten steel stagnant region is generated near the injection hole 112b of the other ladle 110b shown as hatched in FIG. 2A.

For example, FIG. 2B shows the temperature distribution of the molten steel in the tundish in the state where such a molten steel stagnant region is generated.

That is, in FIG. 2B, the darker the red, the higher the temperature, and the greener, the lower the temperature. As described above, it can be seen that the temperature of the molten steel is the lowest in the stagnant region near the ladle inlet 112b.

Therefore, when the temperature of the molten steel falls, the temperature of the hot water surface, which is the surface of the molten steel, is lowered most. At this time, when the temperature drops below the solidification temperature of the molten steel, a molten steel phenomenon occurs in which the molten steel is hardened. The stiffness of the molten steel will affect the subsequent exchange of ladles.

In addition, when the temperature of the subsequent ladle is low or the ladle's tundish arrival is delayed, when the molten steel is supplied to the tundish through the inlet 112b of the second ladle, the temperature of the molten steel is not normal and the molten steel is lowered to the immersion nozzle 122. If supplied, severe nozzle blockage may occur which would block the immersion nozzle if severe.

Such a clogging of the nozzle may be a cause of making the operation of the continuous casting process itself impossible in severe cases.

On the other hand, in order to suppress the flow failure (generating stagnant region) of the molten steel to install a dam structure (refractory structure) (see 50 in Figure 5a) in the tundish 120 to control the molten steel flow (flow) in the tundish Although a method is known, this case is more useful when using one ladle 110 as shown in FIG.

For example, in the continuous casting process using two ladles 110 as shown in FIGS. 1 and 2, the tundish shape is symmetrically based on the outlet (immersion nozzle), and molten steel injection from the ladle to the tundish is left and right. Because of the alternation, the tundish dam is not easy to design based on only one inlet.

That is, in the case of the continuous casting process using two ladles, the dam structure installed in the tundish is limited in controlling the molten steel flow in the tundish.

On the other hand, in order to prevent the temperature drop of the molten steel in the molten steel stagnant region, a heating means, for example, a plasma heater is installed before the tundish outlet (where the immersion nozzle is connected) to heat the temperature of the molten steel in the tundish. The method is also known, but the installation of such a separate heating means increases the cost of building facilities, it is also expensive to operate and repair the facility is another problem occurs.

Accordingly, the present applicant has proposed the present invention to facilitate the induction control of the molten steel in the tundish when using one or two ladles.

The present invention has been proposed in order to solve the conventional problems as described above, the object of the aspect is, by implementing the flow of molten steel accommodated in the tundish gas upflow to prevent the solidification of the molten steel with smooth molten steel flow, as well as the The present invention provides a molten steel flow-induced tundish and a continuous casting method using the same, which increase the tundish residence time and effectively prevent the inclusion of the mold by the inclusion of a smooth inclusion.

As one technical aspect for achieving the above object, the present invention, a tundish main body into which molten steel is introduced; And,

A gas ejection means provided in the tundish body and provided to enable flow of molten steel or floating inclusions through gas ejection;

It provides a molten steel flow-induced tundish configured to include.

In still another aspect, the present invention provides a method for manufacturing a molten steel comprising: supplying molten steel through a ladle to a tundish according to any one of claims 1 to 5; And

Injecting molten steel into a mold of a continuous casting machine in the tundish;

Including,

Provides a continuous casting method using a molten steel flow induction-type tundish characterized by injecting an inert gas into the molten steel through the gas blowing means provided in the tundish to induce the flow of the molten steel or to float the inclusions.

According to the molten steel flow-induced tundish of the present invention and the continuous casting method using the same, the primary effect of preventing molten steel hardening by smooth molten steel flow by implementing the flow control of the molten steel accommodated in the tundish as a gas upflow To provide.

In addition, the flow of molten steel due to the gas upward flow is inductively implemented to increase the tundish residence time of the molten steel and smoothly float the inclusions in case of gas injury, thereby providing another excellent effect of effectively preventing the inclusion of the inclusions in the mold.

Thus, the present invention ultimately makes it possible to improve continuous casting quality.

Hereinafter, a preferred embodiment of the present invention according to the accompanying drawings.

First, Figure 3 shows an embodiment of the molten steel induction-type tundish according to the present invention, Figure 4 shows in detail the gas blowing means provided in the present invention tundish of Figure 3, Figure 5 A tundish of another embodiment is shown including a gas blowing means of four.

That is, the tundish of FIGS. 3 and 5 differs from using two ladles or one ladle, and thus, the nozzle portion 10a of the tundish main body into which the ladle inlets 112a, 112b and 112 enters ( 10a ') and the outlet 10b (10b') in which the immersion nozzle 12 which inject | pours a molten steel in the mold are mutually different.

In addition, the mold and the like of the ladle and the continuous casting machine mentioned in the prior art will be described with the same reference numerals.

In the following, reference numeral 'B' denotes a refractory block structure of a tundish main body or gas ejection means, 'C' denotes a castable (constructable castable layer) of the tundish main body or gas ejection means, and 'T' Represents the outer shell of the tundish body, 'M' represents molten steel, 'S' represents inclusions (slag) contained in the molten steel.

First, FIGS. 3A and 3B show a molten steel flow-induced tundish 1 according to the present invention, which is alternated through the inlets 112a and 112b of the two ladles 110a and 110b as described above. This is a tundish type in which molten steel is supplied.

As shown in FIG. 3B, an outlet 10b is formed at the nozzle portion 10a protruding convexly in the center, and the mold 130 is disposed at the lower portion of the tundish main body 10. The immersion nozzle 12 which is immersed in and supplies molten steel is provided.

Therefore, molten steel is injected into one side of the tundish main body 10 through the injection hole 112a of one ladle 110a disposed on one side of the tundish main body 10 so that molten steel is supplied, and the molten steel level is increased. When lowered, molten steel is continuously supplied to the tundish main body through the injection hole 112b of the other ladle 110b which is introduced to the other side of the tundish main body on the opposite side.

Meanwhile, the tundish 1 of the present invention illustrated in FIGS. 3A and 3B is provided in the tundish main body 10 into which the molten steel M is largely introduced, and the tundish main body 10 through gas ejection. It may be configured to include a gas blowing means 20 provided to enable the flow of the molten steel or the inclusions.

Therefore, in the molten steel flow-induced tundish (1) of the present invention, when molten steel is supplied from one ladle (110a), even if the molten steel stagnant region is formed on the opposite side as described in Figure 2a, the gas blowing means (10) For example, argon gas is ejected from, for example, argon gas is ejected, at this time, the gas upward flow (G) formed by the ejected gas flows toward the water surface in the gas ejection means to induce a flow of the molten steel.

Therefore, in the case of the tundish of the present invention, even when two ladles are used, the molten steel stagnant region is removed, and thus, the surface of the molten steel may be prevented due to the temperature decrease due to the molten steel.

In particular, as the flow of molten steel is forcibly induced, the tundish residence time of the molten steel is increased, which provides sufficient time for the inclusion of slag and the like (S) contained in the molten steel (M) to facilitate the inclusion injury. In addition, the gas upward flow will facilitate floating the inclusion directly.

Therefore, since the floating surface of the inclusion is smooth, when the molten steel is injected into the mold 130 through the tundish outlet 10b, the mixing of the inclusion of the inclusion is suppressed as much as possible.

On the other hand, Figure 4 shows in detail the gas ejection means 20 of the present invention to form such a gas rise (G) to forcibly induce the flow of molten steel and smooth the inclusions.

That is, as shown in Figures 4a and 4b, the gas ejection means 20 of the present invention is a diffuser 30 for ejecting the gas supplied to the molten steel is installed in the tundish main body 10 largely, and It may be configured to include a gas supply line 40 provided in communication with the diffuser in the tundish main body 10 to supply gas to the diffuser (30).

Therefore, the argon gas supplied through the gas supply line 40 is ejected from the diffuser 30 disposed at the bottom of both sides of the tundish main body to form a gas upward flow G in the molten steel.

On the other hand, the diffuser 30 of the gas ejection means of the present invention as shown in Figure 3b, the position between the ladle injection port (112a, 112b) is entered and the immersion nozzle is directly connected to the molten steel outlet (10b) connected to the lower part It is preferable to arrange each.

That is, argon gas is ejected through the diffuser 30 in the molten steel stagnant region formed in the tundish main body opposite to the ladle that is operated when the molten steel is supplied from one side and the other ladle.

At this time, as shown in Figures 4a and 4b, the diffuser 30 of the gas ejection means 20, if provided in a form having a height of about 100mm or more, for example, a dam-shaped rectangular body as shown in Figure 3a It may be provided as a dam structure for controlling the flow of molten steel.

Meanwhile, although not separately illustrated in FIG. 3, the diffuser 30, which may be provided as the dam structure of the quadrangular body of the present invention as illustrated in FIG. 5A, described later, is another known dam structure provided in the tundish main body 10. It may also be used to control the molten steel flow in cooperation with (50).

4A and 4B, the diffuser 30 of the gas ejection means 20 communicates with the gas passage 32 communicating with the gas supply line 40 and with the gas passage. It is provided as a refractory structure disposed on both sides of the bottom of the tundish main body 10 including a gas blowing hole 34 for blowing gas into the molten steel.

At the same time, the gas supply line 40 also has a gas supply passage 42 which is in communication with the external gas supply pipe 44 while communicating with the gas passage 32 included in the diffuser, and the inner wall of the tundish main body 10. It is provided as a refractory structure extending along the construction.

That is, since the diffuser 30 and the gas supply line 40 of the gas ejection means 20 of the present invention are installed in communication with each other while extending along the bottom and the inner wall of the tundish main body, the molten steel supplied to the tundish The gas supply passageway 42 and the gas passageway 32 are formed therein by combining the structure that is not damaged even when immersed in the fire block B and the castable C (castable layer) finished thereon. It is preferable to provide a refractory structure.

Refractory structures using such refractory bricks and castables (layers hardened after finishing the use of kneaded refractory materials) are known in molten steel treatment-related facilities.

In this case, the gas ejection hole 34 of the diffuser 30 may be formed in the refractory brick B constructed above the refractory brick of the side wall.

In addition, it is preferable that both the diffuser 30 and the gas supply line 40 be finished with a known refractory castable C such that molten steel does not penetrate.

In addition, the gas supply passage 42 of the gas supply line 40 may communicate with the gas supply pipe 44 connected to the steel bar T of the tundish main body.

Therefore, when argon gas is supplied through the gas supply pipe 44, the gas is supplied in the order of the gas supply passage 42-> diffuser gas passage 32-> diffuser gas ejection hole 34 of the gas supply line 40. As a result, the gas is flowed from the tundish bottom toward the hot water surface of the molten steel to form the gas upward flow G described above.

At this time, although not shown in a separate drawing, the gas supply passage 42 of the gas supply line 40 is grooved in the castable main body side castable (layer) C used when the tundish main body 10 is constructed. It is also possible to provide a form to form a fireproof block or castable layer (C) thereon to communicate with the diffuser.

At this time, it is important that, as shown in Figure 4, the inert gas such as argon gas to be supplied is supplied at a high pressure to prevent the reverse flow of molten steel into the gas ejection hole 34 of the diffuser 30 or at a certain gas amount or more. It is preferred to be supplied.

For example, argon gas is supplied in an amount of at least 20 l / m immediately before the initial molten steel is supplied to the tundish to prevent the molten steel from flowing into the gas ejection hole of the diffuser. In accordance with this, it may be necessary to increase the gas supply amount through the gas supply line 40 more than 20 l / m so as to smoothly implement the flow of molten steel by the gas upward flow G.

Next, FIGS. 5A and 5B have a gas ejection means 20 of the present invention, but another continuous casting process in which molten steel flows into the tundish main body 10 through the injection hole 112 of one ladle 110. It is shown.

That is, as shown in Figure 5, the injection hole 112 of one ladle 110 enters the convex nozzle portion (10a ') to the center of the tundish main body 10 to inject molten steel, the tundish main body An immersion nozzle 12 for injecting molten steel into the mold 130 for casting the cast 132 to the bottom 10b 'is formed on both sides of the (10) can be provided.

In this case, the tundish 1 as described above may include a dam structure 50 that is a refractory block that controls the flow of molten steel as described above.

Therefore, when molten steel is injected through the ladle inlet 112 at the center of the tundish, molten steel M is injected into the mold 130 through the outlets 10b 'on both sides of the tundish.

That is, in the case of the tundish 1 as shown in FIG. 5, since the molten steel flows into the center and exits to both sides, unlike the case of using two ladles as shown in FIGS. 1 and 3, the molten steel stagnant region does not easily occur. Do not.

However, in FIG. 5, argon gas is introduced through the diffuser 30 of the gas ejection means 20 described above, which is disposed between the dam structure 50 and the outlet 10b 'on both sides of the bottom of the tundish body 10. When ejected, the gas rising flow (G) formed at this time forcibly separates the total inclusions (S) of the molten steel, that is, slag, from the molten steel, so that it is possible to prevent mold mixing of the slag.

And, as described above, if the diffuser 30 of the gas ejection means is in the form of a rectangular body having a height to cooperate with the dam structure 50 provided inside the tundish body to control the flow of molten steel immediately before the outlet Will also provide.

Next, the continuous casting step (method) using the molten steel flow-induced tundish 1 of the present invention described above with reference to FIGS. 3 and 5 will be described.

First, the continuous casting method of the present invention is the step of supplying molten steel (M) through the injection holes (112a, 112b and 112 of FIG. 3) of the ladle to the tundish (1) of the present invention described above, and Injecting molten steel into the mold 130 of the continuous casting machine in the tundish, at the same time in the continuous address using the tundish of the present invention inert gas in the molten steel through the gas blowing means 20 provided in the tundish Phosphorous argon gas is ejected to induce and implement the flow of molten steel (M) and the floating of the inclusions (S) through the gas upward flow (G).

At this time, as shown in FIG. 3, molten steel M is alternately supplied into the tundish 1 through the injection holes 112a and 112b of the two ladles 110a and 110b disposed on both sides of the tundish. In this case, high-pressure argon gas is blown toward the hot water surface through the gas blowing means 20 disposed on the opposite side of the ladle 110a for supplying the molten steel to form a strong gas rising flow G in the molten steel.

Therefore, as shown in FIG. 3, even in the case of continuous casting using two ladles, in the present invention, a high-pressure argon gas is formed by ejecting high-pressure argon gas from the diffuser 30 of the gas ejection means 20 ( G) forcibly induces the flow of molten steel M (see arrow) even if it is far from the operating ladle inlet, so that no molten steel stagnation zone is generated.

That is, the flow of molten steel is implemented to prevent the temperature drop of the molten steel in the stagnant region and to block the water surface hardness due to the temperature drop of the molten steel, and the gas rising flow G is increased by the inclusions S included in the molten steel. Will induce injury.

In particular, if the molten steel is removed and flowed, the molten steel flow width is increased, and the molten steel tundish residence time to the outlet is increased, and this increase in the residence time gives time for inclusions to rise, thus effectively preventing mold mixing. do.

Next, as shown in FIG. 5, in the molten steel supply step of the tundish, molten steel M is supplied to the tundish center side nozzle part 10a ′ from the inlet 112 of one ladle 110, and the tundish is provided. Even when injected into the mold through both side outlets 10b ', the inclusions will be smoothed through the gas ascending flow formed by blowing high pressure inert gas just before tapping.

On the other hand, although schematically illustrated in the drawings, the gas supply pipe 44 connected to the gas supply line of FIGS. 3 and 4 is provided with a gas flow meter and a flow control valve to adjust the gas supply flow rate.

On the other hand, the continuous casting method through the molten steel flow-induced tundish of the present invention described so far as follows.

First, two diffusers 30 are prepared and installed between the inlet and the outlet, respectively, and the argon gas supplied by connecting and supplying the gas supply line 40 and the gas supply pipe 44 for argon gas supply to each diffuser. Adjust with flow meter and flow control valve.

Next, at least 20 l / m or more of argon gas is supplied to the diffuser to prevent the gas ejection hole of the diffuser from being blocked before the molten steel is filled in the continuous casting initial tundish.

Then, the supply of argon gas ejected on the opposite side of the running ladle inlet is increased to such an extent that the grass is not a problem.

In addition, when the level of molten steel supplied in the tundish reaches a normal level, the molten steel surface temperature of the gas ejection region is measured, and when the temperature is low, the amount of argon gas ejected from the diffuser is increased to induce the flow of molten steel to lower the temperature. To prevent.

Finally, when the level of the ladle in operation is lowered, when molten steel is injected into the tundish through the inlet of the other ladle, argon gas is ejected from both diffusers, but the amount of argon gas is controlled in proportion to the amount of molten steel discharged from each ladle inlet. .

Meanwhile, in the present invention in which gas is injected into molten steel through the diffuser of the gas ejection means, and thus the molten steel is realized through the gas upward flow G, and the molten steel stagnant region is generated as shown in FIG. The minimum residence time for molten steel is 70 seconds and 30 seconds, which is much higher in the present invention.

In addition, the stagnant region is also as high as about 12% of the total tungsten molten steel receiving area in the present invention and about 37% in the conventional case.

That is, in the case of the present invention, since the residence time in the tundish of the molten steel is increased and the stagnant area is reduced, the solidification of the molten steel is prevented due to the temperature decrease due to the flow of the molten steel, and the inclusions are also smoothed.

On the other hand, the effect of the present invention as described above, that is, the residence time is increased from 30 seconds to 70 seconds, and the stagnant area is reduced from the conventional 37% of the molten steel receiving area to 12%, fabricating a water model device and stimulus response method experiment This can be seen through.

This stimulus response method is a method of applying a stimulus in the form of a pulse to the inlet of the system and grasping the response at the outlet. The response curve obtained according to the time at the outlet can be referred to as a residence time distribution curve. The residence time and the congestion area can be obtained.

Therefore, in the present invention, it can be seen that the residence time of the molten steel in the tundish is increased by more than two times as compared with the conventional one, and this is due to the diffuser of the gas ejection means of the present invention inducing and implementing the flow of molten steel. It can be seen that / 3 decreases.

As a result, such stagnant zone reduction is advantageous in terms of separation of inclusions by increasing residence time with smooth flow of molten steel.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be modified and modified in various ways without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 is a schematic view showing a continuous casting process using two ladles

Figure 2 shows the flow behavior of the molten steel in the tundish upon supply of molten steel from the conventional ladle to the tundish,

(a) a plan view

(b) is a temperature distribution diagram showing the temperature distribution of the molten steel of FIG. 2A

Figure 3 shows a molten steel flow-induced tundish according to the present invention,

(a) is a front configuration diagram

(b) is a plan view

Figure 4 as showing the gas blowing means provided in the present invention tundish of FIG.

(a) is a side configuration diagram showing the tundish side

(b) is a perspective view of the main part of the gas blowing means of Figure 4a

Figure 5 shows another type of tundish comprising a gas blowing means according to the present invention.

(a) is a front configuration diagram

(b) is a plan view

Explanation of symbols on the main parts of the drawings

1. ... tundish 10 of the present invention.

10b, 10b '.... Exit 12 .... Immersion nozzle

20 .. Gas blowing means 30 .... Diffuser

32 .... Gas passage 34 .... Gas ejection hole

40 .... gas supply line 42 .... gas supply line

44 .. Gas Supply Pipe 50 .... Dam Structure

110,110a, 110b .... Ladle 112 .... Ladle Inlet (Nozzle)

130 .... Casting 132 .... Casting

G .... Gas Upflow

Claims (9)

A tundish body 10 into which molten steel is introduced; And, A gas ejection means (20) provided in the tundish main body (10) and provided to inject a gas to induce the flow of molten steel or to allow the inclusion of the inclusions; Molten steel flow-induced tundish configured to include. The method of claim 1, The gas blowing means 20, A diffuser (30) installed in the tundish main body (10) for ejecting the supplied gas; And, A gas supply line 40 provided in the tundish main body 10 while being connected to supply gas to the diffuser 30; Molten steel flow-induced tundish, characterized in that configured to include. The method of claim 2, The diffuser 30 of the gas ejection means 20 is formed as a structure having a height and is provided as a dam structure alone, or in cooperation with another dam structure 50 provided in the tundish body 10 to flow the molten steel. Molten steel flow-induced tundish, characterized in that configured to control. The method of claim 2, The diffuser 30 of the gas ejection means 20 includes a gas passage 32 in communication with the gas supply line 40, and a gas ejection hole 34 in communication with the gas passage for ejecting gas. Molten steel flow-induced tundish, characterized in that provided as a refractory structure disposed at least one on the bottom side of the tundish body (10). The method of claim 2, The gas supply line 40 includes a gas supply passage 42 connected to an external gas supply pipe 44 while communicating with the gas passage 32 included in the diffuser, and defines an inner wall of the tundish main body 10. Molten steel flow-induced tundish, characterized in that consisting of a refractory structure extending along the construction. The gas of any one of claims 1 to 5, wherein the gas is provided as an inert gas and is supplied at a high pressure or in a predetermined amount or more to prevent inflow of molten steel into the diffuser included in the gas ejection means. Molten steel inductive tundish. Supplying molten steel through the ladle (110) to the tundish (1) according to any one of claims 1 to 5; And Injecting molten steel into the mold 130 of the continuous casting machine in the tundish; Including, Continuous casting method using the molten steel flow induction-type tundish characterized in that the inert gas is injected into the molten steel through the gas blowing means 20 provided in the tundish to induce the flow of the molten steel or to float the inclusions. According to claim 7, In the molten steel supply step of the tundish molten steel (M) is sequentially supplied to the tundish from a plurality of ladles (110a, 110b) disposed on both sides of the tundish, Induce the flow of molten steel through the gas rise (G) formed by blowing the inert gas from the bottom of the tundish to the hot water surface of the molten steel through the gas blowing means on the opposite side of the ladle or the tundish supplying molten steel Continuous casting method using a molten steel flow-induced tundish, characterized in that. According to claim 7, In the molten steel supply step of the tundish molten steel (M) is supplied to the tundish from one ladle 110, Molten steel flow-induced tundish, characterized in that to float the inclusions through the gas rising flow (G) formed by ejecting an inert gas from the bottom of the tundish through the gas ejection means on one or both sides of the tundish from the tundish bottom Continuous casting method using.

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