JP6608052B2 - Molten steel processing apparatus and method - Google Patents

Description

The present invention relates to a molten steel processing apparatus and method, and more particularly, to a molten steel processing apparatus and method capable of controlling the level of molten steel placed in a main body at the initial stage, middle stage, and final stage of a process for each region. .

The tundish of a continuous casting facility is a device that receives steel, for example, molten steel, from a ladle and continuously injects it into a mold. The tundish has a function of storing the molten steel for a certain period of time, maintaining the temperature, and extending the residence time of the molten steel to assist the floating separation of inclusions. In addition, the tundish has a function of supplying molten steel to the mold without interruption while continuously performing the continuous casting process while continuously changing the ladle.

On the other hand, as presented in the following patent documents, conventionally, gas is injected into the tundish, a magnetic field is applied to induce an upward flow of the molten steel, or the molten steel is slagged in a droplet state. Or improve the shape of the dam and weir installed inside the tundish to increase the residence time of the molten steel, etc. Floated and separated.

However, in the conventional method described above, the inclusions can be floated and separated from the molten steel inside the tundish only in a state where the molten steel level inside the tundish is secured at a certain level. For example, it is difficult to separate inclusions from the molten steel placed in the tundish by the conventional method described above at the initial stage, middle stage, and final stage of the process where the molten steel level in the tundish is relatively low.

Therefore, the slab manufactured at the beginning of the process where the molten steel starts to be supplied to the tundish, the slab manufactured at the middle stage of the process where the ladle is replaced and new molten steel starts to be supplied to the tundish, and the residual tundish Inclusions are still mixed in the slab manufactured at the end of the process of finishing the process using molten steel. Eventually, slabs manufactured in the initial, middle and final stages of the process cannot be ensured to have a desired quality and are scrapped.

KR10-2014-0085127A KR10-2013-0076187A KR10-2013-0127247A KR10-2013-0047136A

The present invention provides a molten steel processing apparatus and method capable of controlling the level of molten steel placed inside a main body for each region.

The present invention provides a molten steel processing apparatus and method that can locally increase the level of molten steel at the beginning, middle and end of the process.

The present invention provides a molten steel processing apparatus and method capable of quickly raising the molten steel level on the shroud nozzle side at an early stage of the process and thereby advancing the timing of supplying flux.

The present invention provides a molten steel processing apparatus and method that can move the remaining molten steel to the outlet side in the middle and final stages of the process and ensure the amount of remaining hot water near the outlet.

The present invention provides a molten steel processing apparatus and method capable of reducing the inclusion index of slabs manufactured at the initial, middle and final stages of a process.

The molten steel processing apparatus according to the present invention has a main body whose inside is opened upward and a steel outlet is formed at the bottom, is extended in the width direction of the main body, and is in contact with the bottom of the main body and both side walls in the length direction. a fixed dam which is installed Te, a control dams extending in the width direction of the body, around the fixed dam, on the opposite side of the tapping nozzle, respectively installed in the longitudinal direction of both side walls of said body , a stopper can be in contact with the control dam, viewed contains a drive unit, a moving and rotatably supporting the control dam, the drive unit, the height direction and the length of the control dam said body It is supported so as to be movable in the direction, and is supported so as to be rotatable around the axis in the height direction .

It includes a remaining hot water hole formed through the lower portion of the fixed dam in the length direction.

A control unit for controlling the operation of the driving unit so as to move the control dam in the length direction of the main body and to divide the inside of the main body into a supply region and a discharge region to be isolated from each other. Features.

The control dam may have a width in the width direction so as to be separated from both side walls in the length direction of the main body at the position where the stopper is installed.

The control dam may have a width in a width direction so as to be in contact with a bottom portion of the main body and both side walls in the length direction at a position where the fixed dam is installed.

The control dam is characterized in that a width in the width direction is formed such that both side edges in the width direction are in contact with or overlap with the stopper at a position where the stopper is installed.

  The control dam may further include a protrusion formed at a lower portion of one side surface and having a loading surface at an upper portion.

The stopper is extended in the height direction of the main body and protrudes in the width direction.

A plurality of the fixed dams are installed so as to be spaced apart from each other in the length direction from the central portion of the main body and face each other, and a discharge region is formed on the steel outlet side with the fixed dam as a center. A supply region is formed on the opposite side of the mouth.

A plurality of the control dams and stoppers are installed in the supply area so as to face each other.

The molten steel processing method according to the present invention is a method of processing steel, wherein the inside is opened to the upper side, a steel outlet is formed at the bottom, and a plurality of dams that divide the inside into a supply region and a discharge region are installed. Providing a main body; isolating the supply area from the discharge area using a plurality of the dams; supplying molten steel to the supply area; and supplying the plurality of dams to the supply area and the a step of connecting the discharge region, said discharge region by using a plurality of the dam is isolated from the supply region, and controlling the molten steel level in the discharge area, seen including, said discharge region and the feed region Connecting the interior of the main body with a fixed dam that divides the interior of the main body into the supply area and the discharge area, and ascending and moving a control dam that isolates the discharge area from the supply area; and Releasing the contact of the fixed dam, rotating the control dam about an axis in the height direction, and moving the control dam around the fixed dam to the opposite side of the steel outlet After passing the stoppers installed on both side walls in the length direction, closely contacting the control dam with the stopper, casting the slab with molten steel in the discharge region connected to the supply region, In a steady state, the molten steel level includes the step of dispersing the molten steel pressure to the stopper side by the control dam and controlling the flow of the molten steel .

The step of controlling the level of molten steel in the discharge region includes the step of casting a slab with molten steel remaining in the discharge region isolated from the supply region.

The step of controlling the molten steel level in the discharge region includes the step of casting a slab with the remaining molten steel in the discharge region isolated from the supply region and supplying the subsequent molten steel to the supply region.

After supplying the subsequent molten steel to the supply area, connecting the supply area and the discharge area using a plurality of the dams and supplying the subsequent molten steel to the discharge area; and a plurality of the dams Isolating the discharge area from the supply area using the control method and controlling the molten steel level in the discharge area; and casting the slab with the remaining molten steel in the discharge area isolated from the supply area. It is characterized by including.

According to the present invention, the level of the molten steel placed inside the main body can be controlled for each region. Moreover, the level of molten steel can be raised locally at the initial stage, middle stage, and final stage of the process. That is, the molten steel level on the shroud nozzle side can be quickly raised at the beginning of the process, and the flux can be put in earlier, and the remaining molten steel can be moved to the outlet side at the middle and final stages of the process. The amount of remaining hot water near the steel outlet can be secured.

This can reduce the inclusion index of the slabs produced at the beginning, middle and end of the process.

For example, when applied to a continuous casting facility in a steelworks, the inside of the main body is divided into a supply area and a discharge area, and the supply area is isolated from the discharge area using a fixed dam and a control dam, or the supply area The molten steel can be moved to the discharge area. Therefore, the molten steel level in the supply area where the shroud nozzle is located can be raised earlier than before, the flux can be fed earlier than before, and the outlet port is located at the middle and final stages of the process. Residual molten steel can be moved to the discharge area, and the amount of remaining hot water near the steel outlet can be ensured more than the minimum amount of remaining hot water.

Thereby, the inclusion index of the slab manufactured in the initial stage, the middle stage, and the last stage of the continuous casting process can be reduced.

It is the figure which showed the molten steel processing apparatus which concerns on the Example of this invention.

It is a figure for demonstrating the principal part of the molten steel processing apparatus which concerns on the Example of this invention.

It is a figure for demonstrating the principal part of the molten steel processing apparatus which concerns on the modification of this invention.

It is a sectional side view for demonstrating the principal part of the molten steel processing apparatus which concerns on the Example of this invention.

It is a top view for demonstrating the principal part of the molten steel processing apparatus which concerns on the Example of this invention.

It is process drawing for demonstrating operation | movement of the molten steel processing apparatus which concerns on the Example of this invention.

It is process drawing for demonstrating operation | movement of the molten steel processing apparatus which concerns on the comparative example of this invention.

It is a graph for contrasting and explaining the casting result of the continuous casting process in which the molten steel processing method which concerns on the Example and comparative example of this invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various forms different from each other. However, the embodiments of the present invention are provided in order to complete the disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. For the purpose of illustrating embodiments of the present invention, the drawings may be exaggerated or enlarged, with like reference numerals referring to like elements.

Hereinafter, based on the continuous casting equipment of a steelworks, the Example of this invention is described in detail. However, the present invention is applied to various types of equipment and processes in which various melts are supplied to the inside, stay for a predetermined time, and are supplied to subsequent equipment for processing.

FIG. 1 is a schematic view of a molten steel processing apparatus according to an embodiment of the present invention, and FIG. 2 (a) is an enlarged schematic view showing a main body of the molten steel processing apparatus according to an embodiment of the present invention. FIG.2 (b) is the top view which expanded and showed the main body of the molten steel processing apparatus which concerns on the Example of this invention. FIG. 3 is an enlarged schematic view showing a main body of a molten steel processing apparatus according to a modification of the present invention.

Moreover, Fig.4 (a) thru | or FIG.4 (c) are the sectional side views which showed the main body inside of the molten steel processing apparatus which concerns on the Example of this invention. 4A is a side sectional view showing the main body cut in the width direction at a position where there is no stopper, and FIG. 4B is a side view showing the main body in the width direction at the position where the stopper is installed. FIG. 4 (c) is a side sectional view cut away, and FIG. 4C shows the main body at the position where the stopper is installed cut in the width direction in a state where the control dam is moved to the position where the stopper is installed. FIG.

Moreover, Fig.5 (a) thru | or FIG.5 (c) are the top views which showed the main body inside of the molten steel processing apparatus which concerns on the Example of this invention. 5A is a plan view showing the main body at a position without the stopper, and FIG. 5B is a plan view showing the main body at the position where the stopper is installed . c) is a plan view showing the main body at the position where the stopper is installed in a state where the control dam is moved to the position where the stopper is installed.

1 to 3, on the other hand, in the embodiment and the modification of the present invention, the control dam is in close contact with the stopper on the steel outlet side with the stopper as the center, but the close contact position of the control dam with respect to the stopper is as described above. It is not limited to. For example, the control dam can be brought into close contact with the stopper from the opposite side of the steel outlet with the stopper as the center. Therefore, the control dam can more stably control the flow of the molten steel while the molten steel is continuously injected into the main body while partially distributing the pressure caused by the flow of the molten steel to the stopper side. it can.

A molten steel processing apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS.

The molten steel processing apparatus according to the embodiment of the present invention includes a transport container 10, a first nozzle 20, a main body 30, a second nozzle 40, a mold 50, a dam unit 60, a drive unit 70 and a control unit 80. Including. Such a molten steel processing apparatus supplies, for example, a subsequent molten steel having the same or different composition as the previous molten steel to the inside of the main body 30 contained in the previous molten steel while exchanging the transport container 10, and a slab. It can be applied to various processes such as a continuous casting process for continuous casting or a continuous casting process for different steel types.

The transport container 10 includes a ladle. The transport container 10 is constructed of a refractory inside such that the molten steel M is piled up, for example, as a cylindrical container whose inside is opened upward. The transport container 10 is movably provided on the upper side of the main body 30 and serves to supply the molten steel M contained therein to the main body 20. A collector nozzle (not shown) is attached through one side of the lower part of the transport container 10, and the first nozzle 20 is connected to the lower part of the collector nozzle.

The first nozzle 20 includes a shroud nozzle. For example, the first nozzle 20 is movably supported by a manipulator (not shown) provided on one outer side of the main body 30, and is coupled to the collector nozzle on the lower side of the transport container 10 and connected to the transport container 10. Is done.

The main body 30 includes a tundish. The main body 30 is a container of a predetermined shape that receives the supply of the molten steel M from the transport container 10 below the transport container 10 and temporarily stores it, and forms an outer wall of the main body 30 to maintain the shape. A refractory part 32 constructed inside the skin 31 and the iron skin 31 is included. The main body 30 can be symmetrical with respect to the central portion in the length direction (x-axis direction), and the width in the length direction can be larger than the width in the width direction. Moreover, the main body 30 can be made into the shape where the center part of a length direction protrudes to the one side of the width direction (y-axis direction).

On the other hand, the width of the main body 30 decreases in the width direction from the center in the length direction toward both side edges in the length direction. That is, the width of the main body 30 becomes narrower as it goes from the center to the end in the length direction.

The inside of the main body 30 is opened to the upper side, and a cover (not shown) is attached to the upper part. An injection port is formed at the center of the cover, and the first nozzle 20 is inserted into the injection port and connected to the inside of the main body 30. A steel outlet 35 is formed in the bottom 33 of the main body 30, and a plurality of left and right symmetrical multiples are separated from both side edges in the length direction with reference to the central portion in the length direction (x-axis direction) of the main body 30. Respectively.

The steel outlet 35 is located in the vicinity of both side walls 34a in the width direction extending in the width direction among the side walls of the main body 30 so as to output the molten steel M received in the main body 30. Each is formed through the bottom 33 in the height direction. The second nozzle 40 is attached to the steel outlet 35 below the main body 30 and connected to the main body 30.

The second nozzle 40 includes a submerged entry nozzle. The second nozzle 40 is a hollow tube through which the molten steel M passes, and is extended in the height direction (z-axis direction), the upper and lower portions are opened, and the inside is protected by a refractory. The second nozzle 40 is mounted through the steel outlet 35 on the lower side of the main body 30 so that the molten steel M put in the main body 30 is supplied to the mold 50. A gate (not shown) having a slide structure is prepared on one side of the second nozzle 40, and the gate can adjust the opening amount of the second nozzle 40 to adjust the amount of steel output of the molten steel M.

The mold 50 is separated in the length direction (x-axis direction) and a pair of first plates opposed to each other, and the both sides of the first plate at positions separated in the width direction (y-axis direction) and opposed to each other. These are rectangular or square hollow blocks in which the side surfaces are formed by a pair of second plates that respectively connect the two, the upper and lower portions are opened, and a space in which the molten steel M is primarily solidified is formed. The mold 50 is positioned so as to surround the lower portion of the second nozzle 40, and receives the supply of the molten steel M from the main body 30, and has a role of solidifying the cast slab and continuously drawing it out.

A cooling table (not shown) is provided below the mold 50. The cooling stand cools the slab drawn from the mold 50 and executes a series of forming operations. The cooling table is provided with a plurality of segments, and the plurality of segments are continuously arranged in a predetermined direction to form a curved or vertically curved cooling table. Each segment is provided with a plurality of rolls to guide the drawing of the slab. A nozzle is provided between the rolls, and the nozzle sprays cooling water onto the slab to cause secondary cooling of the slab.

Hereinafter, a dam unit according to an embodiment of the present invention will be described in detail. The dam unit 60 is installed inside the main body 30 so as to control the flow of steel, for example, molten steel M, put into the main body 30. The dam unit 60 has a symmetrical structure that is installed on both the left and right sides with respect to the center portion of the main body 30 in the length direction (x-axis direction).

The dam unit 60 is extended in the width direction (y-axis direction) of the main body 30, and is separated from the center portion in the length direction of the main body 30 toward the steel outlet 35 and in the length direction of the bottom 33 of the main body 30. A fixed dam 61 installed in contact with both side walls 34b, a remaining hot water hole 62 formed through the lower part of the fixed dam 61 in the length direction, and a control formed extended in the width direction of the main body 30. The dam 63 and the stopper 64 each installed in the both-sides wall 34b of the length direction of the main body 30 on the opposite side of the steel outlet 35 centering on the fixed dam 63 are included.

The fixed dam 61 is a dam made of a refractory material, and is extended in the width direction of the main body 30 and formed into a plate shape having a predetermined thickness in the length direction and a predetermined area in the width direction and the height direction. It is spaced from the stopper 64 toward the steel outlet 35 and is installed at the lower part of the main body 30. The fixed dam 61 causes the molten steel M, which is guided to the inside lower side of the main body 30, to flow upward by the control dam 63. The upper end portion of the fixed dam 61 has a certain height from the bottom 33 of the main body 30 so that the upward flow of the molten steel M is easy and the flow rate of the molten steel M is formed at a desired flow rate. On the other hand, as the height of the fixed dam 61 increases, the upward flow of the molten steel M is relatively suppressed, and the flow velocity of the molten steel M increases relatively as the height decreases.

A plurality of, for example two, fixed dams 61 are spaced apart from each other in the length direction from the center of the main body 30 and face each other. The installation structure of such fixed dams 61, for example, the supply area A and the discharge The interior of the main body 30 is divided into a supply area A and a discharge area B by an installation structure that divides the area B. For example, the supply area A is formed inside the fixed dam 61 and the discharge area B is formed outside.

At this time, the inside of the fixed dam 61 in which the supply region A is formed is a region on the opposite side of the steel outlet 35 with the fixed dam 61 as the center. Further, the outside of the fixed dam 61 where the discharge region B is formed is a region on the side of the steel outlet 35 with the fixed dam 61 as the center.

In the supply area A, a plurality of, for example, two stoppers 64 can be installed facing each other. Accordingly, a plurality of, for example, two control dams 63 can be installed in the supply area A so as to face each other.

The remaining hot water hole 62 is formed through the lower portion of the fixed dam 61 in the length direction, and the inside thereof can be connected to the bottom 33 of the main body 30. The molten steel M on the lower side inside the main body 30 can move from the supply area A to the discharge area B through the remaining hot water hole 62.

The control dam 63 is a dam made of a refractory material, and extends in the width direction of the main body 30 and is formed in the shape of a plate having a thickness in the length direction and a width in the width direction and the height direction. The The control dam 63 is disposed in the supply region A of the main body 30, is supported by the driving unit 70, is moved in the length direction, the width direction, and the height direction, and can rotate about the axis in the height direction. .

The control dam 63 is separated from both side walls 34b in the longitudinal direction of the main body 30 in order to prevent structural interference with the main body 30 when the stopper 64 is installed or moved and rotated in the supply region A. Thus, the width in the width direction is formed, and at the position where the fixed dam 61 is installed, the width in the width direction is formed so that both the bottom 33 of the main body 30 and both side walls 34b in the length direction are in contact with each other.

Thereby, the control dam 63 is free to move and rotate in the supply area A of the main body 30 without colliding with the main body 30, and moves to the installation position of the fixed dam 61 on the supply area A side. The supply area A can be isolated from the discharge area B by being in close contact with both the bottom 33 of the main body 30 and both side walls 34b in the length direction.

Further, the control dam 63 is formed to have a width in the width direction so as to be separated from both side walls 34 b in the length direction of the main body 30, and both side edges in the width direction are formed on the stopper 64 at positions where the stoppers 64 are installed. A width in the width direction is formed so as to contact or overlap.

Moreover, when the control dam 63 moves to the position where the stopper 64 is installed on the inside upper side of the main body 30 and both side edges in the width direction are brought into close contact with the stopper 64, the upper end of the control dam 63 is the molten steel M surface. A width in the height direction is formed such that the lower end portion is positioned higher than the bottom portion 33 of the main body 30.

As a result, the control dam 63 is brought into close contact with the stopper 64 and plays the role of, for example, a weir. The steel dam 63 falls to the main body 30 and receives the flow of the molten steel M guided to the discharge region B side. It is possible to reduce the initial flow strength of the molten steel M to a desired strength by guiding the inside downward.

The stoppers 64 are respectively installed on both side walls 34b in the length direction of the main body 30 at positions separated from the fixed dam 61 toward the center portion in the length direction of the main body 30 and extended in the height direction of the main body 30. , Can be projected in the width direction. The stopper 64 serves to seal between the control dam 63 and both side walls 34b in the length direction of the main body 30 when the control dam 63 is moved to and brought into close contact with the position where the stopper 64 is installed. The stopper 64 is made of a refractory material.

The protrusion length in the width direction of the stopper 64 is formed corresponding to the width in the width direction of the control dam 63, and is the same as the separation distance between the control dam 63 and the side walls 34 b in the length direction of the main body 30. Or larger than the separation interval.

On the other hand, the position of the stopper 64 in the longitudinal direction of the main body 30 can maximize the ability to remove inclusions from the molten steel while the control dam 63 is in close contact with the stopper 64 and the molten steel is supplied in a normal state. It is selected at a position where it can.

The drive unit 70 is, for example, a mechanical or hydraulic drive device provided at a predetermined position outside the main body 30. The drive unit 70 is formed to support the control dam 63 so as to be movable and rotatable. More specifically, the drive unit 70 is formed to support the control dam 63 so as to be movable along the length direction of the main body 30. The dam 63 is formed so as to be inclined or rotatable around an axis in the height direction.

At this time, the inclination described above controls the angle of the control dam 63 around the height axis, and changes the angle of the control dam 63 so that the control dam 63 can pass between the stoppers 64. It means that the attitude of the control dam 63 is controlled. Further, the rotation described above controls the angle of the control dam 63 around the height axis, and is relatively larger than a small angle that allows the control dam 63 to pass between the stoppers 64. It means that the attitude of the control dam 63 is controlled by controlling the angle of the control dam 63.

The drive unit 70 extends in the height direction and is attached to the upper end of the control dam 63 so as to be aligned with the center of the control dam 63 in the width direction on the upper side of the control dam 63. 71, a second drive rod 72 that is extended in the width direction, is attached to a drive rod 71 at one side end in the width direction and is supported so as to be movable in the height direction, and is formed to be movable in the length direction. The third drive rod 73 is attached to the other end of the second drive rod 72, and the fourth drive rod 74 is connected to the third drive rod 73 and supports movement in the length direction.

Meanwhile, the driving unit 70 is formed by various configurations and methods capable of supporting the control dam 63 so as to be movable and rotatable, and is not particularly limited by the above-described configuration and method.

The control unit 80 is formed so as to control the operation of the driving unit 70 in accordance with the already input process pattern. For example, the control unit 80 moves the control dam 63 in the length direction and the height direction of the main body 30 and rotates the control dam 63 about the axis in the height direction, thereby fixing the fixed dam 61 inside the supply region A of the main body 30. Can be brought into close contact with each other, can be brought into close contact with the stopper 64, and can be moved to the center side in the longitudinal direction of the main body 30 by the stopper 64. Such an operation can be controlled separately for each detailed process of the process. Under the control of the control unit 80, the inside of the main body 30 can be divided into a supply area A and a discharge area B and can be isolated from each other. The remaining molten steel in the supply area A of the main body 30 can be pushed and moved to the discharge area B side.

Although the embodiments of the present invention have been described above with reference to FIGS. 1, 2, 4 and 5, the present invention can be variously configured including the following modifications.

Hereinafter, with reference to FIG.1 and FIG.3, the molten steel processing apparatus which concerns on the modification of this invention is demonstrated. The molten steel processing apparatus according to the modified example of the present invention is partially similar in configuration to the molten steel processing apparatus according to the above-described embodiment of the present invention. The description will be omitted and will be described below with a focus on components that are separated from the embodiment of the present invention.

The dam unit 60 ′ of the molten steel processing apparatus according to the modification of the present invention is extended in the width direction of the main body 30, and is separated from the steel outlet 35 side at the center in the length direction of the main body 30. The fixed dam 61 installed in contact with the bottom 33 and both side walls 34b in the length direction, the remaining hot water hole 62 formed through the lower portion of the fixed dam 61 in the length direction, and the width direction of the main body 30 A control dam 63 that extends to the fixed dam 63, and stoppers 64 that are respectively installed on both side walls 34 b in the longitudinal direction of the main body 30 on the opposite side of the steel outlet 35. It may further include a protruding portion 65 formed to protrude at a lower portion of one side surface of the control dam 63 toward the central portion in the length direction. At this time, the protruding portion 65 is formed to protrude at the lower portion of one side surface of the control dam 63 and can be formed to protrude at the center portion in the width direction of the lower portion of one side surface of the control dam 63.

The protrusion 65 is extended in the width direction and the length direction, and includes an upper surface intersecting with one side surface of the control dam 63, and is inclined and extended downward from one side in the width direction of the upper surface. The shape of the block is provided with a slope connected to the lower end and a vertical surface extending vertically downward from both sides in the length direction of the upper face and connected to the upper face and the end of the slope in the width direction. be able to. The protrusion 65 can take out and remove a certain amount of slag and flux formed on the molten steel M surface using the upper surface. At this time, the protrusion 65 has a flat upper surface and can perform the role of a loading surface. In this case, at least one of the slag and the flux is laminated on the loading surface, and the slag is formed from molten steel. And flux can be removed. Alternatively, the protrusion 65 has an upper surface opened upward, and a loading space is formed therein. In this case, the loading space inside the protrusion 65 via the upper surface where at least one of slag and flux is opened. The slag and flux can be removed from the molten steel by the method of accommodating in the steel.

6A to 6E are process diagrams for explaining the operation of the molten steel processing apparatus according to the embodiment of the present invention. 6A is a process diagram illustrating a stage in which molten steel is supplied from the discharge region B of the main body 30 to the supply region A that is isolated, and FIG. FIG. 4 is a process diagram showing a stage in which flux F is charged and applied after molten steel is supplied to a supply region A isolated from B at a certain level.

FIG. 6C is a process diagram illustrating a stage where casting is performed with molten steel in the discharge region B connected to the supply region A of the main body 30, and FIG. 6D is a supply region of the main body 30. While casting is performed with the molten steel in the discharge region B connected to A, the slag (not shown) on the molten steel surface and a kind in the flux F are moved to the central portion side in the length direction of the main body 30 and removed. It is process drawing which showed the step to perform. FIG. 6E is a process diagram showing a stage in which casting is finished with residual molten steel in the discharge region B isolated from the supply region A of the main body 30, for example, residual molten steel or residual molten metal.

With reference to FIG.1 and FIG.6 (a) thru | or (e), operation | movement of the molten steel processing apparatus which concerns on the Example of this invention is demonstrated. At this time, the position and operation of the dam unit 60 will be described in detail with reference to the right side in the left and right sides with the length direction of the main body 30 as the center.

First, as shown in FIGS. 6 (a) and 6 (b), for example, at the initial stage of the continuous casting process, the control dam 63 is brought into close contact with the fixed dam 61, and the supply area A of the main body 30 is moved from the discharge area B. Isolate. Thereafter, molten steel M is poured into the main body 30. At this time, the molten steel M can be injected only into the supply region A of the main body 30, and the molten steel level can be quickly raised. Thereafter, when the molten steel level of the main body 30 becomes higher than the end level of the first nozzle 20 and the end of the first nozzle 20 is immersed in the molten steel M, the flux F is rapidly introduced into the main body 30. It is possible to quickly prevent the molten steel M from being re-oxidized by putting it in and applying it to the molten metal surface.

Thereafter, when the supply of the molten steel M is continued and the molten steel level of the main body 30 reaches a predetermined level, the control dam 63 is moved and raised toward the stopper 64 so as to be in close contact with the stopper 64. During such a process, the spaced space formed between the control dam 63 and the bottom surface 33 of the main body 30 and the spaced space formed between the control dam 63 and both side walls 34b in the length direction of the main body 30 are separated. The molten steel M and the flux F are moved through the remaining space and supplied to the discharge region B.

In the above process, the control dam 63 is brought into close contact with the stopper 64 on the second nozzle 40 side or in close contact with the stopper 64 on the first nozzle 20 side with reference to the stopper 64.

On the other hand, before the control dam 63 is moved toward the stopper 64 and brought into close contact, the control dam 63 and the main body 30 are restored by tilting or rotating the control dam 63 about a height axis and then returning it. It is possible to move the molten steel M and the flux F more smoothly by adjusting the size of the separation space formed between the both side walls 34b in the longitudinal direction.

Thereafter, when the molten steel M supplied to the discharge region B reaches a predetermined level, casting starts. While casting is performed on the molten steel M in the discharge region B connected to the supply region A, as shown in FIG. 6C, the molten steel of the main body 30 is maintained in a working level. At this time, the control dam 63 functions as, for example, a weir in the upper region of the main body 30 and controls the flow strength of the molten steel M to a desired strength while guiding the molten steel M to the lower side inside the main body 30. .

Thereafter, while the supply of the molten steel M to the main body 30 is completed and the molten steel level of the main body 30 is lowered, the control dam 63 is moved to the first nozzle 20 side as shown in FIG. At this time, the control dam 63 can be moved by a method of passing between the stoppers 64 in a state where the control dam 63 is inclined or rotated by a predetermined angle about the height axis. In this way, the control dam 63 can easily pass between the stoppers 64 without structurally interfering with the stoppers 64 inside the main body 30. In such a process, the slag and flux formed on the molten steel M surface can be moved to the center portion side of the main body 30, and this reaction causes a relatively clean state located at the lower portion of the main body 30. Molten steel can be moved to the discharge region B side. At this time, the slag and flux moved to the central portion side of the main body 30 are loaded on the upper surface of the protruding portion 65 formed to protrude from one side surface of the control dam 63 and removed from the molten steel M surface.

Thereafter, the control dam 63 is fixed to the fixed dam as shown in FIG. 6 (e) at the middle or final stage of the continuous casting process where the molten steel level inside the main body 30 gradually decreases and reaches a predetermined level. The molten steel in the supply region A can be moved to the discharge region B, and then the control dam 63 is brought into close contact with the fixed dam 61, and the discharge region B in a state where the molten steel level is increased. Can be isolated from the supply area A. Thus, molten steel level h _B in the discharge area B side can be higher than the molten steel level h _A in the supply region A side. Thereafter, casting is performed with the remaining molten steel in the discharge region B isolated from the supply region A.

Thus, by making the molten steel level in the discharge region B higher than the molten steel level in the supply region A in the middle or final stage of the continuous casting process, the inflow of slag is prevented from reaching the height of the molten steel near the outlet. The quality of the slab manufactured at the middle stage or the last stage of the process can be improved.

7A to 7D are process diagrams showing the operation of the molten steel processing apparatus according to the comparative example of the present invention. With reference to FIG.6 and FIG.7, operation | movement of the molten steel processing apparatus which concerns on the comparative example of this invention is demonstrated compared with operation | movement of the molten steel processing apparatus which concerns on the Example of this invention.

7A to 7D, the molten steel processing apparatus according to the comparative example of the present invention is different from the embodiment of the present invention in that the lower dam 91 and the upper dam 92 are fixed inside the main body 30. An upper dam 92 is fixedly installed on the upper side of the main body 30 at a position separated from the first nozzle 20 toward the second nozzle 40, for example, as in a conventional dam structure. A lower dam 91 is fixedly installed on the lower side of the main body 30 at a position spaced from the second nozzle 40 toward the second nozzle 40.

In the comparative example of the present invention, the continuous casting process of finishing the process with the residual molten steel from the initial stage of the continuous casting process (see FIGS. 7A and 7B) where the molten steel starts to be supplied into the main body 30. Until the end stage (see FIGS. 7C and 7D), the molten steel level of the main body 30 is the same throughout the general area of the main body 30, and in particular, the molten steel level h on the first nozzle 20 side at the end stage of the process. ' _A and the molten steel level h' _B on the second nozzle 40 side are formed at the same height. Thus, in the comparative example of this invention, the molten steel level by the side of the 1st nozzle 20 and the molten steel level by the side of the 2nd nozzle 40 cannot be adjusted locally, respectively. Cannot be adjusted separately.

As described above, in the comparative example of the present invention, the flow and the molten steel level in the initial and final stages of the continuous casting process cannot be controlled by a desired method by fixing the position of the dam in the main body. That is, since the molten steel is received by the entire interior of the main body 30 when the first nozzle 20 is opened, the increase in the molten steel level is delayed from the case of the embodiment of the present invention, so that the introduction of the flux is delayed. It is impossible to quickly suppress or prevent reoxidation of molten steel due to contact with the steel. In addition, the molten steel level is lowered throughout the interior of the main body 30 at the end of the continuous casting process, and it is relatively difficult to maintain the minimum amount of remaining hot water. Eventually, the actual yield of molten steel decreases.

On the other hand, in the embodiment of the present invention, as described above, the molten steel level can be changed and controlled for each of the supply region A and the discharge region B of the main body 30, and the flux charging time can be advanced at the initial stage of the process. In the middle and final stages of the process, the amount of remaining hot water near the steel outlet can be ensured to be more than the minimum amount of remaining hot water, thereby ensuring the quality and yield of the slab.

FIG. 8 is a graph showing inclusion indexes of slabs cast in a continuous casting process to which the molten steel processing methods according to the examples and comparative examples of the present invention are applied.

At this time, the inclusion index of FIG. 8 means the oxygen content contained in the manufactured slab, and the slab was cast at the initial stage of the continuous casting process, for example, with molten steel at the time of the first charge (Charge, Ch). The test piece was obtained for each length, the oxygen content of the test piece was analyzed, and the result was digitized. Since the method of analyzing the oxygen content with a slab and deriving the inclusion index is a known technique, detailed description thereof is omitted.

  When FIG. 8 is seen, the inclusion index of the slab manufactured by the continuous casting process of the molten steel processing apparatus which concerns on the Example of this invention was manufactured by the continuous casting process of the molten steel processing apparatus which concerns on the comparative example of this invention. It can be confirmed that it is generally lower than the inclusion index of the slab. In the embodiment of the present invention, reoxidation of the molten steel can be suppressed or prevented by rapidly increasing the molten steel level in the supply region at an early stage of the continuous casting process and by advancing the timing of supplying the flux. Because. On the other hand, in the comparative example of the present invention, the initial rise rate of the molten steel level is slower than in the case of the embodiment of the present invention, so that the flux injection time is also delayed. This is because oxidation cannot be suppressed quickly.

Hereinafter, with reference to FIG. 1 thru | or FIG. 6, the molten steel processing method to which the molten steel processing apparatus which concerns on embodiment of this invention is applied is demonstrated. At this time, below, the content which overlaps with the description mentioned above which concerns on the molten steel processing apparatus which concerns on the Example and modification of this invention is abbreviate | omitted, or is demonstrated easily.

The molten steel processing method according to the embodiment of the present invention is a step of preparing a main body in which a plurality of dams are provided, the inside of which is opened upward, a steel outlet is formed at the bottom, and the inside is divided into a supply region and a discharge region. Isolating the supply region from the discharge region using a plurality of dams, supplying the molten steel to the supply region, connecting the supply region and the discharge region using the plurality of dams, Isolating the discharge area from the supply area using a dam and controlling the level of molten steel in the discharge area.

First, a main body 30 is prepared in which the inside is opened upward, a steel outlet 35 is formed in the bottom 33, and a plurality of dams that divide the inside into a supply area A and a discharge area B are installed. Thereafter, the control unit 80 controls the drive unit 70 so that the control dam 63 is brought into close contact with the fixed dam 61 and the supply region A is isolated from the discharge region B.

Thereafter, the transport container 10 is positioned above the supply area A of the main body 30, and the molten steel is supplied into the supply area A of the main body 30. In this way, the molten steel M is supplied only to the supply region A, and the molten steel level can be rapidly increased.

That is, by using the control dam 63, it is possible to reduce the molten steel injection space in the initial stage, thereby reaching the lower level of the molten steel at the lower end of the first nozzle 20 faster than before. Can be made.

If the molten steel level rises and becomes higher than the end level of the first nozzle 20, the flux F is uniformly applied to the molten steel surface, and the molten steel is rapidly prevented from being reoxidized. At this time, since the initial application area of the flux F can be made smaller than before, the molten steel surface can be protected at an earlier time.

In this way, by bringing the application time of the flux F ahead, it is possible to supply the molten steel in a clean state in which the reoxidation reaction is suppressed compared to the conventional case to the discharge region B, which is manufactured at the initial stage of the continuous casting process. Incorporation of oxidizing inclusions into the slab can be reduced, and thereby the quality of the initial slab can be ensured.

Thereafter, when the molten steel level rises and reaches a predetermined height, the control dam 63 is raised and moved to release the close contact with the fixed dam 61, thereby connecting the supply area A and the discharge area B. Let Thereafter, the control dam 63 is brought into close contact with the stopper 64 to induce the flow of the molten steel to the lower side of the main body 30, and when the molten steel supplied to the discharge region B reaches a certain level, it is connected to the supply region A. Casting of the slab into the molten steel in the discharge area B is started.

In the above process, the control dam 63 can be brought into close contact with the stopper 64 on the second nozzle 40 side, or can be brought into close contact with the stopper 64 on the first nozzle 20 side with reference to the stopper 64.

Thereafter, casting is continuously performed while maintaining the molten steel at a normal working level within the main body 30.

When the supply of the molten steel to the main body 30 is completed, the molten steel level of the main body 30 is lowered as casting proceeds. In such a process, the control dam 63 is moved to the first nozzle 20 side, the slag is moved to the center in the length direction of the main body 30, and the molten steel in the lower state of the main body 30 is discharged into the discharge region. Move to B side. After that, the slag collected at the center of the main body 30 can be taken up from the molten steel surface by a method such as loading on the upper part of the projecting part 65 formed at the lower part of the control dam 63 and can be removed by a certain amount. . Accordingly, it is possible to effectively suppress or prevent the slag from moving to the exit steel port side of the main body 30 and flowing into the exit steel port.

When the supply of the molten steel to the main body 30 is completed, as the casting proceeds, the molten steel level of the main body 30 further decreases, and the amount of molten steel remaining inside the main body 30 reaches the minimum remaining hot water amount. In such a process, with the control dam 63 lowered to a predetermined height, the control dam 63 is moved to the fixed dam 61 side, the molten steel in the supply area A is moved to the discharge area B side, and the molten steel in the discharge area B is moved. The level is controlled, and then the control dam 63 is brought into close contact with the fixed dam 61, and the discharge region B is isolated from the supply region in a state where the molten steel level is high.

After that, when the remaining molten steel in the discharge region B isolated from the supply region A is continuously supplied to the mold and cast into a slab, the molten steel level in the discharge region B reaches the molten steel level with the minimum amount of remaining hot water. Complete the continuous casting process.

Thus, the molten steel level in the discharge region B can be easily raised before the amount of molten steel remaining in the main body 30 reaches the minimum remaining hot water amount. Thereby, in the Example of this invention, the inflow of the slag to the steel outlet 35 can be suppressed or prevented, the quality of a slab can be ensured, and continuous casting is performed as the molten steel level increases. Continuing, the amount of remaining hot water inside the main body 30 can be reduced at the end of the continuous casting process.

In the above, although the molten steel processing method which concerns on embodiment of this invention was demonstrated in detail, this invention is comprised variously including the following modification. Hereinafter, the molten steel processing method which concerns on the modification of this invention is demonstrated.

The molten steel processing method according to the modified example of the present invention is a molten steel processing method applicable to, for example, a continuous casting process or a continuous casting process of different steel types, and the inside is opened to the upper side, and a steel outlet is formed at the bottom, Preparing a main body in which a plurality of dams that divide the interior into a supply area and a discharge area are prepared; isolating the supply area from the discharge area using the plurality of dams; supplying molten steel to the supply area; A step of connecting the supply region and the discharge region using a plurality of dams, and a step of isolating the discharge region from the supply region using a plurality of dams to control the molten steel level in the discharge region.

Here, the step of controlling the molten steel level in the discharge region is performed by casting a slab with residual molten steel in the discharge region isolated from the supply region and supplying subsequent molten steel to the supply region, and using a plurality of dams. Connecting the supply area and the discharge area and supplying the subsequent molten steel to the discharge area; isolating the discharge area from the supply area using a plurality of dams; and controlling the molten steel level in the discharge area; and the supply area The method further includes casting a slab of molten steel remaining in the discharge region isolated from the steel.

First, a main body 30 is prepared in which the inside is opened upward, a steel outlet 35 is formed in the bottom 33, and a plurality of dams that divide the inside into a supply area A and a discharge area B are installed. Thereafter, the control unit 80 controls the drive unit 70 to bring the control dam 63 into close contact with the fixed dam 61 and isolate the supply area A from the discharge area B.

Thereafter, the transport container 10 is positioned above the supply area A of the main body 30, and the molten steel is supplied into the supply area A of the main body 30. Thus, the molten steel M can be supplied only in the supply area A, and the molten steel level rises rapidly.

That is, it is possible to reduce the molten steel injection space in the initial stage by using the control dam 63, thereby causing the molten steel level to reach the lower end portion of the first nozzle 20 faster than the conventional amount by a smaller amount. be able to.

When the molten steel level rises and becomes higher than the level at the end of the first nozzle 20, the flux F is uniformly applied to the molten steel surface to quickly prevent reoxidation of the molten steel. At this time, since the initial application area of the flux F is smaller than that of the conventional one, the molten steel surface can be protected at an earlier time.

Thereafter, when the molten steel level rises and reaches a predetermined height, the control dam 63 is raised and moved to release the close contact with the fixed dam 61, thereby connecting the supply area A and the discharge area B. Let Thereafter, the control dam 63 is brought into close contact with the stopper 64 on the first nozzle 20 side, or is brought into close contact with the stopper 64 on the second nozzle 40 side, and the flow of the molten steel is guided to the lower side of the main body 30 to enter the discharge region B. When the supplied molten steel reaches a certain level, casting of the slab starts with the molten steel in the discharge region B connected to the supply region A.

At this time, in accordance with the application time of the flux F, the molten steel in a clean state in which the reoxidation reaction has been suppressed is supplied to the discharge region B according to the slab manufactured at the initial stage of the continuous casting process. Mixing of oxidative inclusions can be reduced, thereby ensuring the quality of the initial slab.

Thereafter, casting is continuously performed while maintaining the molten steel at a normal working level within the main body 30.

When the supply of the molten steel to the main body 30 is completed, the molten steel level of the main body 30 is lowered as casting proceeds. In such a process, the control dam 63 is moved to the first nozzle 20 side, the slag is moved to the central portion in the length direction of the main body 30, and the molten steel in the lower state of the main body 30 is discharged into the discharge region. Move to B side. Thereafter, a certain amount of slag collected at the center of the main body 30 can be taken up from the molten steel surface and removed by a method such as loading on the upper part of the protrusion 65 formed at the lower part of the control dam 63. Accordingly, it is possible to effectively suppress and prevent the slag from moving toward the steel outlet side of the main body 30 and flowing into the steel outlet.

When the supply of molten steel to the main body 30 is completed, as the casting proceeds, the molten steel level of the main body 30 further decreases, and the amount of molten steel remaining inside the main body 30 reaches the minimum remaining hot water amount. In such a process, with the control dam 63 lowered to a predetermined height, the control dam 63 is moved to the fixed dam 61 side, the molten steel in the supply area A is moved to the discharge area B side, and the molten steel in the discharge area B is moved. The level is controlled, and then the discharge area B is isolated from the supply area in a state where the control dam 63 is brought into close contact with the fixed dam 61 and the molten steel level is increased.

Thereafter, the molten steel remaining in the discharge region B isolated from the supply region A is continuously supplied to the mold, and the subsequent molten steel is supplied to the supply region B at the same time as the casting proceeds. At this time, the subsequent molten steel is a molten steel having the same composition as the previous molten steel remaining in the discharge region B, and is a molten steel of a different steel type having a different component from the previous molten steel remaining in the discharge region B.

Thereafter, when the molten steel level of the subsequent molten steel in the supply region A rises and reaches a predetermined height, the control dam 63 is raised and moved to release the close contact with the fixed dam 61, thereby supplying the supply region A. And the discharge area B are connected. Thereby, the subsequent molten steel put in the supply area A can be supplied to the discharge area B. Thereafter, the control dam 63 is brought into close contact with the stopper 64 to induce the flow of molten steel to the lower side of the main body 30, and the casting of the slab is continuously performed continuously with the molten steel in the discharge region B connected to the supply region A. To do.

When the supply of the subsequent molten steel to the main body 30 is completed, the molten steel level of the main body 30 is lowered as casting proceeds. In such a process, the control dam 63 is moved to the first nozzle 20 side, the slag is moved to the central portion in the length direction of the main body 30, and the molten steel in the lower state of the main body 30 is discharged into the discharge region. Move to B side. Thereafter, the slag collected at the center of the main body 30 can be taken up from the molten steel surface by a method such as loading on the upper part of the protruding part 65 formed at the lower part of the control dam 63, and a certain amount can be removed. . As a result, it is possible to effectively suppress and prevent the slag from moving to the steel outlet side of the main body 30 and flowing into the steel outlet.

When the supply of the subsequent molten steel to the main body 30 is completed, as the casting progresses, the molten steel level of the main body 30 further decreases, and the amount of residual molten steel inside the main body 30 reaches the minimum remaining hot water amount. In such a process, in a state where the control dam 63 is lowered to a predetermined height, the control dam 63 is moved to the fixed dam 61 side, and the molten steel in the supply area A is moved to the discharge area B side. The molten steel level of the molten steel is raised, and thereafter the control dam 63 is brought into close contact with the fixed dam 61 to isolate the discharge region B from the supply region in a state where the molten steel level is high.

Thereafter, the molten steel remaining in the discharge area B isolated from the supply area A is continuously supplied to the mold, cast into a slab, and the molten steel level of the subsequent molten steel remaining in the discharge area B is the molten steel at the minimum remaining hot water amount. When the level is reached, the continuous casting process is completed.

As described above, according to the embodiment of the present invention, it is possible to prevent the delay of the flux injection at the initial stage of the continuous casting process, minimize the exposure of the molten steel received by the main body during standby, and restart the molten steel. Oxidation can be prevented. Thereby, the quality of the initial slab can be improved effectively. Also, in order to prevent the inflow of slag due to the vortex formed near the steel outlet at the end of the process, the molten steel level can be increased locally, and the molten steel remaining in the main body at the end of the continuous casting process The minimum amount of remaining hot water can be reduced. In the case of a continuous casting process of different steel types, the mixing part can be reduced.

Thus, in the Example of this invention, while performing a continuous casting process smoothly, the quality of a slab can be ensured in the initial stage and the last stage of a continuous casting process, and a yield can be ensured. Moreover, the mixing part of the slab can be minimized during the continuous casting process of different steel types.

It should be noted that the above embodiments of the present invention are intended to illustrate the present invention and not to limit the present invention. The present invention is embodied in various forms different from each other within the scope of the claims and the technical idea equivalent thereto, and a person skilled in the technical field to which the present invention pertains It can be understood that various embodiments are possible within the scope of the idea.

Claims (14)

A main body whose inside is opened to the upper side and a steel outlet is formed at the bottom;
A fixed dam that extends in the width direction of the main body and is installed in contact with the bottom of the main body and both side walls in the length direction;
A control dams extending in the width direction of the body,
Centered on the fixed dam, on the opposite side of the steel outlet, on each side wall in the longitudinal direction of the main body, and a stopper that can contact the control dam,
See containing and a driving unit to move and rotatably supporting the control dam,
The said drive part supports the said control dam so that a movement in the height direction and length direction of the said main body is possible, and it supports so that it can rotate centering | focusing on the axis | shaft of the said height direction, The molten steel processing apparatus characterized by the above-mentioned .   The molten steel processing apparatus according to claim 1, further comprising a remaining hot water hole formed through a lower portion of the fixed dam in a length direction.   A control unit for controlling the operation of the driving unit so as to move the control dam in the length direction of the main body and to divide the inside of the main body into a supply region and a discharge region to be isolated from each other. The molten steel processing apparatus of Claim 1 characterized by the above-mentioned. The molten steel processing apparatus according to claim 1 , wherein the control dam is formed with a width in a width direction so as to be separated from both side walls in the length direction of the main body at a position where the stopper is installed. The control dam, to claim 1 or 4, characterized in that the width in the width direction as the fixed dam is brought into contact with the bottom and the lengthwise direction of both side walls of the body in the installed position is formed The molten steel processing apparatus as described. 5. The molten steel according to claim 1 , wherein the control dam has a width in the width direction so that both side edges in the width direction come into contact with the stopper at a position where the stopper is installed and overlap each other. Processing equipment.   The molten steel processing apparatus according to claim 1, further comprising a protrusion formed to protrude at a lower portion of one side surface of the control dam and provided with a loading surface at an upper portion thereof. The molten steel processing apparatus according to claim 1 , wherein the stopper extends in the height direction of the main body and protrudes in the width direction. A plurality of the fixed dams are installed so as to be spaced apart from each other in the length direction from the central portion of the main body,
2. The molten steel processing apparatus according to claim 1 , wherein a discharge region is formed on the steel outlet side with the fixed dam as a center, and a supply region is formed on the opposite side of the steel outlet. . The molten steel processing apparatus according to claim 9 , wherein a plurality of the control dams and stoppers are installed in the supply area so as to face each other. A method of processing steel,
A step of preparing a main body in which a plurality of dams are provided, the inside of which is opened upward, a steel outlet is formed at the bottom, and the inside is divided into a supply region and a discharge region;
Isolating the supply area from the discharge area using a plurality of the dams;
Supplying molten steel to the supply region;
Connecting the supply area and the discharge area using a plurality of the dams;
The discharge region by using a plurality of the dam is isolated from the supply region, viewed including the the steps of controlling the molten steel level in the discharge region,
Connecting the supply area and the discharge area comprises:
Contact the fixed dam that divides the inside of the main body into the supply area and the discharge area, and lift and move the control dam that isolates the discharge area from the supply area, thereby releasing the adhesion between the control dam and the fixed dam. And the stage of
Stoppers installed on both side walls in the longitudinal direction of the main body so that the control dam is rotated about an axis in the height direction and the control dam moves to the opposite side of the steel outlet around the fixed dam. After allowing the control dam to adhere to the stopper;
Casting a slab with molten steel in the discharge area connected to the supply area;
A molten steel processing method comprising: at a steady state molten steel level, dispersing the molten steel pressure to the stopper side with the control dam and controlling the flow of the molten steel. Controlling the level of molten steel in the discharge area comprises
The molten steel processing method according to claim 11 , comprising casting a slab with molten steel remaining in the discharge region isolated from the supply region. Controlling the level of molten steel in the discharge area comprises
The molten steel processing method according to claim 11 , further comprising a step of casting a slab with residual molten steel in the discharge region isolated from the supply region and supplying subsequent molten steel to the supply region. After supplying the subsequent molten steel to the supply area,
Connecting the supply region and the discharge region using a plurality of the dams, and supplying the subsequent molten steel to the discharge region;
Isolating the discharge area from the supply area using a plurality of the dams and controlling the level of molten steel in the discharge area;
Molten steel processing method according to claim 13, characterized in that it comprises the steps of casting a cast piece in the residual molten steel in the discharge region which is isolated from the supply region.

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