KR20120024193A - Apparatus for compensating temperature of mold flux and method for continuous casting using it - Google Patents

Apparatus for compensating temperature of mold flux and method for continuous casting using it Download PDF

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Publication number
KR20120024193A
KR20120024193A KR1020100086954A KR20100086954A KR20120024193A KR 20120024193 A KR20120024193 A KR 20120024193A KR 1020100086954 A KR1020100086954 A KR 1020100086954A KR 20100086954 A KR20100086954 A KR 20100086954A KR 20120024193 A KR20120024193 A KR 20120024193A
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KR
South Korea
Prior art keywords
mold flux
temperature
mold
insulating material
oxygen
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KR1020100086954A
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Korean (ko)
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KR101219608B1 (en
Inventor
서경원
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주식회사 포스코
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Publication of KR20120024193A publication Critical patent/KR20120024193A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Abstract

The present invention relates to a mold flux temperature compensation device and a continuous casting method using the same. In particular, the present invention relates to a device for compensating for the temperature of a molten mold flux injected into an upper portion of molten steel in order to prevent the temperature of molten steel from being lowered, and a continuous casting method using the same.
Mold flux temperature compensation device according to an embodiment of the present invention is a device for compensating the temperature of the mold flux of the molten state injected into the mold, the heating cover which is arranged spaced above the mold flux, and through the heating cover A heat insulating material supply for injecting a heat insulating material on top of the mold flux, a gas supply for supplying oxygen to the inner space of the heating cover to oxidize the heat insulating material, and supported by the heating cover so that one end is immersed in the mold flux. It includes a temperature meter for measuring the temperature of the mold flux and a controller for controlling the driving of the insulation material supply and the gas supply in conjunction with the temperature meter.
In addition, the continuous casting method according to an embodiment of the present invention is the step of injecting molten steel into the mold, the step of injecting the molten mold flux in the upper portion of the molten steel, and the step of injecting the insulating material on top of the mold flux And measuring the temperature of the mold flux, oxidizing the insulating material by injecting oxygen toward the insulating material according to the measured temperature of the mold flux, and oxidizing the insulating material on the upper portion of the mold flux. Replenishing the step.

Description

Apparatus for compensating temperature of mold flux and method for continuous casting using it}

The present invention relates to a mold flux temperature compensation device and a continuous casting method using the same. In particular, the present invention relates to a device for compensating for the temperature of a molten mold flux injected into an upper portion of molten steel in order to prevent the temperature of molten steel from being lowered, and a continuous casting method using the same.

Continuous casting is the casting of molten steel into a mold of a certain shape, and the molten steel reacted in the mold is continuously drawn to the lower side of the mold to cast slabs, billets, blooms, etc. Refers to the casting method to manufacture.

Looking at the configuration of a general continuous casting device (hereinafter referred to as "yeon cycle") with reference to Figures 1 and 2 as follows. 1 is a perspective view illustrating a general continuous casting apparatus, and FIG. 2 is an enlarged view of portion A of FIG. 1.

A typical player may include a ladle 10 containing hot molten steel 1 refined in a steelmaking process, a tundish 20 temporarily receiving the molten steel 1 from the ladle 10, and temporarily storing the molten steel 1 from the ladle 10; The molten steel 1 is injected from the tundish 20 through the nozzle 22 and the mold 30 which is initially solidified to a predetermined shape through primary cooling and the cast steel 2 drawn from the mold 30 are 2 It comprises a feed roller 40 for performing a series of operations to bend or straighten while completing the solidification by cooling. Cast slab 2 passed through the feed roller 40 is cut into a predetermined length by the cutter 50 and then conveyed to the storage.

The molten mold flux 3 is injected into the molten steel 1 injected into the mold 30 in the process of manufacturing the liquid molten steel 1 into the solid cast 2 through such a machine. . The mold flux 3 prevents the surface of the molten steel 1 from being exposed to the atmosphere to be oxidized or lowered in temperature, and controls heat transfer between the molten steel 1 and the mold 30. In addition, the lubricating ability is improved to facilitate the drawing of the molten steel 1 solidified to the lower side of the mold 30.

The mold flux 3 is melted at a temperature of 1,400 to 1,450 ° C. in the melting furnace. The mold flux 3 is exposed to the atmosphere during the injection into the mold 30, and rapidly drops to a temperature of 1,200 to 1,250 ° C. The mold flux 3 whose temperature has dropped sharply does not keep the molten steel 1 warm, but rather deprives the heat of the molten steel 1 to lower the fluidity of the molten steel 1 and the like. When the temperature of the molten steel 1 is lowered, fine dekels 8, which are cast defects, are generated on the surface of the molten steel 1, thereby degrading the quality of the cast steel 2. (Here, the decal 8 generated at the surface portion of the molten steel 1 is collected in the molten mold flux 3, moves to the mold flux inflow layer 3a, and is fused to the solidification cell 1a. Decel 8a fused to (1a) is caused by surface defects of cast steel 2.)

In order to solve the above problems, conventionally, a method of covering the insulating material 4, the insulating cover and the like on the mold flux 3 has been used. However, according to the conventional method, it is possible to reduce the heat radiation H degree of the mold flux 3 to prevent the temperature of the mold flux 3 from dropping sharply, but to keep the temperature of the mold flux 3 constant. I could not let you. In other words, there is a limit to the continuous prevention during the continuous casting process that the means for heating the mold flux 3 is not provided and thus the temperature of the mold flux 3 and the surface temperature of the molten steel 1 are lowered.

The present invention provides a mold flux temperature compensation device and a continuous casting method using the same.

The present invention provides an apparatus for compensating the temperature of the mold flux by oxidizing the heat insulating material injected into the upper part of the mold flux in order to prevent the temperature of the molten steel during the continuous casting, and a continuous casting method using the same.

Mold flux temperature compensation device according to an embodiment of the present invention is a device for compensating the temperature of the mold flux of the molten state injected into the mold, the heating cover which is arranged spaced above the mold flux, and through the heating cover A heat insulating material supply for injecting a heat insulating material on top of the mold flux, a gas supply for supplying oxygen to the inner space of the heating cover to oxidize the heat insulating material, and supported by the heating cover so that one end is immersed in the mold flux. It includes a temperature meter for measuring the temperature of the mold flux and a controller for controlling the driving of the insulation material supply and the gas supply in conjunction with the temperature meter.

In addition, the continuous casting method according to an embodiment of the present invention is the step of injecting molten steel into the mold, the step of injecting the molten mold flux in the upper portion of the molten steel, and the step of injecting the insulating material on top of the mold flux And measuring the temperature of the mold flux, oxidizing the insulating material by injecting oxygen toward the insulating material according to the measured temperature of the mold flux, and oxidizing the insulating material on the upper portion of the mold flux. Replenishing the step.

According to the mold flux temperature compensation device and the continuous casting method using the same according to the embodiments of the present invention, the temperature of the molten mold flux injected into the upper portion of the molten steel in the mold during the continuous casting process is automatically measured The temperature of the molten mold flux can be kept constant by oxidizing the thermal insulation material injected into the mold flux according to the measurement temperature of the mold flux. Therefore, the quality of the cast steel can be improved by preventing the temperature of the molten mold flux from being lowered to prevent the occurrence of deckle at the molten steel surface and minimizing the defect of the cast steel.

In addition, the productivity of the continuous casting process can be improved by automatically replenishing the thermal insulation material that is oxidized for temperature compensation of the mold flux, and by automatically supplying oxygen for the oxidation of the thermal insulation material.

1 is a perspective view showing a typical continuous casting device.
FIG. 2 is an enlarged view of a portion A of FIG. 1; FIG.
Figure 3 is a state diagram of the installation of the mold flux temperature compensation apparatus according to an embodiment of the present invention.
4 is a schematic installation state diagram of a mold flux temperature compensation device according to a modification of the present invention.
5 is a perspective view of a mold flux temperature compensation device according to the present invention.
Figure 6 is a cross-sectional side view of a mold flux temperature compensation device according to the present invention.
7 is a drive state diagram of a mold flux temperature compensation device according to the present invention.
8 is a flow chart showing a continuous casting method according to an embodiment of the present invention.

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, but may be implemented in various forms, and only the embodiments of the present invention to complete the disclosure of the present invention, to those skilled in the art It is provided to fully inform the category. Wherein like reference numerals refer to like elements throughout.

3 is a view illustrating an installation state of a mold flux temperature compensating apparatus according to an embodiment of the present invention, FIG. 4 is a schematic view illustrating an installation state of a mold flux temperature compensating apparatus according to a modification of the present invention, and FIG. 6 is a perspective view of a mold flux temperature compensating apparatus, and FIG. 6 is a cross-sectional view of one side of a mold flux temperature compensating apparatus according to the present invention, and FIG. 7 is a driving state diagram of the mold flux temperature compensating apparatus according to the present invention.

3 to 7, the mold flux temperature compensating apparatus 100 according to an exemplary embodiment of the present invention may be a molten mold injected into an upper portion of a molten steel 1 in a mold 30. A device for maintaining a flux (mold flux) 3 at a constant temperature, the heating lid 200 spaced apart from the upper side of the mold flux (3), and the heat insulating material 4 through the heating lid 200 to the mold flux ( 3) a gas supplier 400 for supplying oxygen (G) to the inner space (S; see FIG. 6) of the heating lid 200 to oxidize the heat insulating material (4) to be injected into the upper portion of the heating cover 200; The temperature measuring part 500 which is supported by the heating lid 200 so that one end part is immersed in the molten mold flux 3 and measures the temperature of the mold flux 3, and the thermal insulation material supplyer in cooperation with the temperature measuring part 500 ( 300 and a controller (not shown) for controlling the driving of the gas supplier 400. In addition, the mold flux temperature compensating apparatus 100 moves horizontally (D 1 , D 2 ) or up and down (M 1 ) the heating lid 200 settled as shown in FIG. 3 in the upper space of the mold 30. To include a position adjuster 600.

The heating lid 200 is located above the mold flux 3 in the mold 30, and the open lower region of the heating lid 200 forms the temperature compensation region of the mold flux 3. As shown in FIG. 4, the heating lid 200 is preferably disposed to be adjacent to corner portions P 1 , P 2 , P 3 , and P 4 inside the mold 30. The heating lid 200 is arranged so that a pair is fixedly arranged along the long axis direction (x direction) of the mold 30 (see FIG. 4 (a)) or a pair is horizontally moved (D 1 ) (FIG. 4 (b) ). When the pair of heating lids 200 (200a, 200b) are located at the edge of the mold 30, in the process of drawing the cast steel 2, the temperature of the cast steel 2 is greater than the central portion of the cast steel 2 Compensation of the temperature of the meniscus area or the corner area can minimize the occurrence of cast defects in this area. In addition, the pair of heating lids 200a and 200b may be connected to the position controller 600, respectively, and may be horizontally driven D 1 in the mold 30 along the long axis direction (x direction) of the mold 30. . That is, after being positioned at both edges of the mold 30 for a predetermined time, the three heating covers 200a, 200b, and 200c are installed by horizontal driving (D 1 ) for temperature compensation of the central portion of the molten steel 1. Can produce effects. However, since the nozzle 22 continuously receiving the molten steel 1 from the tundish 20 (see FIG. 1) is positioned at the center of the mold 30, the pair of heating lids 200a and 200b moves the nozzle during horizontal movement. Only the position close to 22 is horizontally moved D 1 .

The heating cover 200 is made of a material having excellent heat resistance, corrosion resistance, durability, etc. because it is exposed to a high temperature environment. To this end, the heating cover 200 is a heat insulating material provided on the inner circumferential surface of the cover body 210 of the metal material forming the inner space (S) with the lower opening, and the cover body 210 forming the inner space (S) ( 220). In this embodiment, a stainless steel material, in particular, SUS 310S is used as the material of the cover body 210.

The heating lid 200 is provided with a heat insulating material supplier 300 that can cover the upper portion of the mold flux 3 in order to prevent the mold flux 3 from being exposed to the atmosphere and suddenly lowering the temperature. The thermal insulation material supplier 300 includes a thermal insulation material storage container 310 for storing and storing the thermal insulation material 4 therein, and the thermal insulation material 4 dropped to an open lower portion of the thermal insulation material storage container 310 at the upper side of the heating cover 200. Insulating material feeder 320 to be transferred and the heat insulating material supply pipe is installed so as to penetrate the heating cover 200, the thermal insulation material 4 transferred from the heat insulating material feeder 320 into the inner space (S) of the heating cover 200. 340. In addition, one side of the heat insulating material supply pipe 340 includes a heat transfer material measuring amount sensor 350 for measuring the transfer amount of the heat insulating material 4, and transmits the measured transfer amount information of the heat insulating material 4 to the controller.

The thermal insulation material storage container 310 is formed of a metal material, and a hollow portion is formed therein so as to contain the thermal insulation material 4 in a powder state. Further, the lower side of the hollow portion is formed as a taper surface in which the opening narrows toward the lower direction (z direction) so that the heat insulating material 4 can easily fall on the heat insulating material feeder 320. Although not shown, the upper surface of the heating cover 200 is provided with a supporting means for supporting the thermal insulation storage container 310, the open lower portion of the thermal insulation material storage container 310 to determine whether the thermal insulation material 4 fall and fall amount Opening and closing means may be provided to adjust. The heat insulating material transporter 320 includes a case that serves as a transfer passage of the heat insulating material 4, and a screw that pushes the heat insulating material 4 to one side by a rotational drive R is provided inside the case. A screw drive motor for rotating the screw is provided at one outer side of the case along the axial direction of the screw. The screw drive motor is subjected to the drive control of the controller to determine whether the rotation and the rotation speed. On the other hand, the thermal insulation material feed amount sensor 350 is the amount of the thermal insulation material 4, that is, the mold flux (3) supplied to the thermal insulation material supply pipe 340 according to the rotation drive (R) time, the rotation drive time of the insulation material feeder 320, etc. Measure the amount of the insulation (4) is injected into the top of the.

The thermal insulation material 4 injected into the upper portion of the mold flux 3 through the thermal insulation material supplyer 300 prevents the upper portion of the mold flux 3 from being exposed to the atmosphere to not only keep the mold flux 3 warm but also by oxidation. It is made of a material having excellent thermal conductivity capable of heating (H) the mold flux 3. In the present embodiment, carbon black having excellent thermal conductivity and oxidizing property was used as the heat insulating material 4. In addition to carbon black, in the case of a powder type material which is excellent in oxidizing property and excellent in thermal conductivity, it can be used as the heat insulating material 4, of course.

The gas supplier 400 is a means for oxidizing the heat insulating material 4 in order to maintain the temperature of the mold flux 3 at a reference temperature set by an operator when it is determined that the temperature of the mold flux 3 has decreased. To this end, the gas supplier 400 is provided on the upper surface of the heating cover 200 and communicates with the oxygen inlet pipe 410 to receive oxygen (G) from the outside, and branched into a plurality of oxygen inlet pipe (410) , And an oxygen branch pipe 420 installed through the heating cover 200 such that each branched end thereof protrudes from the inner space S of the heating cover 200. In addition, provided on one side of the oxygen inlet pipe 410 includes an oxygen supply amount measuring sensor 440 for measuring the amount of oxygen supplied to the oxygen inlet pipe 310, and transmits the measured oxygen amount information to the controller. In addition, although the heat insulating material 4 exposed to the high temperature environment can be oxidized by the supply of oxygen G, sparks are generated to rapidly burn oxygen G at the same time as the oxygen G supply. Igniter 430 may be included. When oxygen G is supplied to the oxygen inlet pipe 410 from an oxygen tank (not shown) provided outside, it is injected into the inner space S of the heating lid 200 through the oxygen branch pipe 420. One end of the oxygen branch pipe 420 protruding into the inner space S is provided with a shower head means (not shown) to evenly spray the oxygen (G). Although not shown, a valve means is provided on the path of the oxygen inlet pipe 410 to control the driving of the controller to control whether the oxygen G is supplied or the supply amount of the oxygen G.

The temperature measuring device 500 may measure the temperature of the mold flux 3 in real time or at regular time intervals. The temperature measuring unit 500 is provided on the upper surface of the contact type thermostat 520, such as a probe (probe) such that one end is immersed in the mold flux (3), the heating cover 200 is provided with a heating cover 200 The elevating drive (M 2 ) of the contact heater (520) installed to penetrate through the heater to adjust the height of one end of the contact heater (520) in the inner space (S) of the heating lid (200). 510. The temperature value of the mold flux 3 measured in the temperature meter 500 is transmitted to the controller, which compares the transmitted measured temperature value with a reference temperature set by the operator. When the measured temperature is lower than the reference temperature, that is, when the temperature of the mold flux 30 is lowered, the gas supplier 400 is driven to oxidize the thermal insulation material 4, and the thermal insulation material supply 300 is driven to consume by oxidation. Replenish the prepared insulation (4). The drive control of this controller is continued until the end of the continuous casting process.

Although not shown, the controller is provided with a database storing various transmission information, and is provided with input means such as a keyboard and a mouse so that the operator can set the reference temperature and the like. In addition, output means such as a monitor, a printer, a speaker, and the like are provided to check the driving state of the mold flux temperature compensating apparatus 100 from the outside. When transmitting various types of information to the controller, wired and wireless methods may be selectively used.

The position adjuster 600 is connected to each of the plurality of support bars 610 protruding upward from the upper edge portion of the heating cover 200, and the plurality of support bars 610 to elevate the plurality of support bars 610. A bogie means 630 for mounting a support bar lifter 620 incorporating a cylinder-piston to drive M 1 , and a support bar lifter 620 aligned in the axial direction (y direction) of the mold 30; And a pair of first rails 640 extending in parallel in the short axis direction (y direction) of the mold 30 from the upper side of the mold 30 so as to set the movement path of the bogie means 630, and a pair of A pair of second rails 660 and a pair that are installed to extend in parallel in the long axis direction (x direction) of the mold 30 so as to mount the first rail 640 to set a movement path of the pair of first rails. And a rail driver 650 for horizontally driving the pair of first rails 640 on the second rail 660. Although not shown, driving means such as a motor is provided in the vehicle 630 and the rail driver 650.

As the heating cover 200 is driven in the vertical direction (z direction) by the support bar lifter 620, the heat insulating material 4 into which the inner space S of the heating cover 200 is introduced into the upper portion of the mold flux 3. Can be close to the surface of the. In addition, the pair of first rails 640 and the pair of second rails 660 that cross each other may allow the heating lid 200 to freely escape from the upper region of the mold 30 so that the tundish 20 1, the interference of the mold flux temperature compensation device 100 is not generated in the process of injecting the molten steel 1 contained in the mold 30.

Hereinafter, a continuous casting method according to an embodiment will be described in detail with reference to the accompanying drawings. The mold flux temperature compensation device 100 described above is used for the continuous casting method according to the present embodiment, and the same parts as the above descriptions of the mold flux temperature compensation device 100 will be omitted.

8 is a flowchart illustrating a continuous casting method according to an embodiment of the present invention.

Referring to FIG. 8, in the continuous casting method according to an embodiment of the present invention, the molten steel 1 that passes through the ladle 10 (see FIG. 1) and the tundish 20 (see FIG. 1) is injected into the mold 30. Step S110, injecting the molten mold flux 3 into the molten steel 1 injected into the mold 30 (S120), and the mold flux temperature compensating device above the mold 30 ( Injecting the insulating material 4 in the upper portion of the mold flux (3) by moving the 100 (S130), the step of measuring the temperature of the mold flux (3) covered with the insulating material (S140), and the mold flux Oxidizing the insulating material 4 by injecting oxygen (G) to the upper side of the insulating material 4 according to the temperature measured value (3) (S150), and the mold flux by the amount consumed by the oxidation of the insulating material (4). Comprising (S160) to replenish the insulation 4 to the upper portion (3). Temperature measurement step (S140) of the mold flux (3), oxidation and replenishment steps (S150, S160) of the heat insulating material (4) is repeated during the continuous casting process by the step (S170) that the completion of the continuous casting process is determined Is performed.

In the continuous casting method according to the present embodiment, the mold flux temperature compensating apparatus 100 molds the heat insulating member 4 through the heating lid 200 and the heating lid 200, which are spaced apart from each other on the upper side of the mold flux 3. Insulating material supply unit 300 to be injected into the upper portion of the flux (3), Gas supply unit 400 for supplying oxygen (G) to the inner space (S) of the heating lid 200 to oxidize the insulating material 4, Mold One end portion is immersed in the flux 3 so as to be supported by the heating lid 200 to measure the temperature of the mold flux 3 and the temperature measuring device 500 and the temperature measuring device 500 in cooperation with the thermal insulation material supplier 300 and the gas supplier ( A controller (not shown) for controlling the driving of the 400 is included. In addition, it includes a position adjuster 600 for horizontally moving (D 1 , D 2 ) and up and down (M 1 ) in the space above the mold 30 placed in the heated cover 200. (Hereinafter, detailed description of the components 200 to 600 of the mold flux temperature compensating apparatus 100 will be omitted.) Meanwhile, in the continuous casting method according to the present embodiment, carbon black is used as the heat insulating material 4. .

The mold flux temperature compensation device 100 automatically inputs the insulation 4 to the upper portion of the mold flux 3, and when the continuous casting process starts, the temperature measurement of the mold flux 3 until the end is completed in real time. Or at regular time intervals.

In the present embodiment, the temperature of the mold flux 3 is measured by using the temperature measuring device 500 after the insulating material 4 is placed on the mold flux 3. However, as a modification, the temperature measuring device 500 is molded. The temperature of the mold flux 3 may be first measured in the state of being immersed in the flux 3, and the heat insulating material 4 may be introduced into the upper portion of the mold flux 3 while the temperature measuring device 500 is immersed. In addition, in order to inject the insulating material 4 to the upper portion of the mold flux 3 with a uniform thickness, the insulating material 4 is moved while the heating cover 200 is moved (D 1 , D 2 ) using the position controller 600. It can be put in.

When the temperature of the mold flux 3 measured by the temperature measuring device 500 is lower than the reference temperature set by the operator of the playing process, the heat insulating material 4 injected into the upper portion of the mold flux 3 is oxidized to mold mold ( Compensate for the lowered temperature of 3). In addition, after the temperature of the mold flux 3 is compensated, the insulation 4 is automatically replenished by an amount consumed by oxidation so that the insulation 4 is accumulated to a predetermined thickness on the mold flux 3. As described above, according to the continuous casting method according to an embodiment of the present invention, incorporation, oxidation, and replenishment of the thermal insulation material 4 are automatically performed in a series of steps in conjunction with the temperature measurement of the mold flux 3, thereby providing a continuous casting process. During the process, the temperature of the mold flux 3, that is, the temperature of the molten steel 1 can be kept constant. Therefore, it is possible to prevent the occurrence of defects due to the temperature drop of the molten steel 1 and to improve the quality of the cast steel 2 (see FIG. 1).

As described above, according to the mold flux temperature compensation device and the continuous casting method using the same, the temperature of the mold flux injected into the upper portion of the molten steel in the mold during the continuous casting process is automatically measured. In addition, the temperature of the mold flux can be kept constant by oxidizing the thermal insulation material injected into the mold flux according to the measurement temperature of the mold flux. Therefore, the temperature of the mold flux may be prevented from being lowered to prevent the occurrence of deckle at the molten steel surface, thereby minimizing the defects of the cast, thereby improving cast quality. In addition, the productivity of the continuous casting process can be improved by automatically replenishing the thermal insulation material that is oxidized for temperature compensation of the mold flux, and by automatically supplying oxygen for the oxidation of the thermal insulation material.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified and modified without departing from the spirit of the appended claims.

1: molten steel 3: mold flux
4: insulation material 30: mold
100: mold flux temperature compensation device 200: heating cover
300: insulation material supply 400: gas supply
500: temperature meter 600: position controller

Claims (12)

An apparatus for compensating the temperature of a molten mold flux injected into a mold,
A heating lid spaced apart above the mold flux;
A heat insulator supplying the heat insulator through the heating cover and into the top of the mold flux;
A gas supplier for supplying oxygen to an inner space of the heating lid to oxidize the heat insulating material;
A temperature measuring device which is supported by the heating cover so that one end is immersed in the mold flux and measures the temperature of the mold flux; And
A controller for controlling the driving of the insulation material supply device and the gas supply device in association with the temperature measuring device;
Mold flux temperature compensation device comprising a. The method according to claim 1,
And a position controller for placing the heating cover to move horizontally and vertically in an upper space of the mold. The method according to claim 1 or 2,
The heating cover,
The mold flux temperature compensation device is provided in a plurality spaced apart from the upper side of the mold flux along the longitudinal direction of the mold to be adjacent to the corner portion of the inside of the mold. The method according to claim 1 or 2,
The heating cover,
And a cover body made of metal, the lower part of which is open to form the inner space, and an inner heat insulating material provided on the inner circumferential surface of the cover body exposed to the inner space. The method of claim 4,
The cover body is a mold flux temperature compensation device formed of a stainless steel material. The method according to claim 1 or 2,
The insulation material supplier,
An insulating material storage container for storing the insulating material;
A thermal insulation material transporter for transferring the thermal insulation material dropped from the thermal insulation material storage container to an upper side of the heating cover;
A heat insulating material supply pipe installed through the heating cover to supply the heat insulating material transferred from the heat insulating material feeder to an inner space of the heating cover; And
A thermal insulation material feed sensor provided at one side of the thermal insulation material supply pipe to measure a transport amount of the thermal insulation material, and transmit the measured amount of the thermal insulation material to the controller;
Mold flux temperature compensation device comprising a. The method according to claim 1 or 2,
The gas supplier,
An oxygen inlet pipe provided on an upper surface of the heating cover to receive oxygen from the outside;
An oxygen branch pipe which is branched to and communicates with the oxygen inlet pipe and injects oxygen into the inner space through the heating lid such that one end thereof protrudes into the inner space; And
An oxygen supply amount sensor provided at one side of the oxygen inlet pipe to measure an oxygen amount supplied to the oxygen inlet pipe, and transmit the measured oxygen amount information to the controller;
Mold flux temperature compensation device comprising a. The method according to claim 1 or 2,
The temperature measuring device,
A contact thermostat having one end immersed in the mold flux;
A temperature riser configured to adjust the height of one end of the contact temperature heater in the inner space of the heating lid;
Mold flux temperature compensation device comprising a. As a continuous casting method,
Injecting molten steel into the mold;
Injecting a molten mold flux into an upper portion of the molten steel;
Injecting an insulating material on top of the mold flux;
Measuring the temperature of the mold flux;
Oxidizing the insulating material by injecting oxygen toward the insulating material according to the measurement temperature of the mold flux; And
Replenishing the insulation on top of the mold flux by the amount of oxidation of the insulation;
Continuous casting method comprising a. The method according to claim 9,
Oxidizing the thermal insulation material,
Comparing the measured temperature of the mold flux with a set reference temperature;
Injecting oxygen toward the thermal insulation material when the measured temperature is lower than the set reference temperature; And
Oxidizing the insulation to compensate for the temperature of the mold flux with heat generated from the insulation;
Continuous casting method comprising a. The method according to claim 9,
The insulation is a continuous casting method in which carbon black is used. The method according to any one of claims 9 to 11,
After the step of replenishing the insulation,
The continuous casting method of determining the completion of the continuous casting process to repeat the temperature measurement step of the mold flux, oxidation and replenishment of the insulation.
KR1020100086954A 2010-09-06 2010-09-06 Apparatus for compensating temperature of mold flux and method for continuous casting using it KR101219608B1 (en)

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KR101360607B1 (en) * 2012-05-03 2014-02-11 주식회사 포스코 Mold heating apparatus

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KR102123914B1 (en) * 2018-11-06 2020-06-17 한국인닥타썸(주) Casting mold upper induction heating devices with pancake shape and large ingot fabricating method using the same
JP2023550614A (en) 2020-11-20 2023-12-04 インダクトサーム・コーポレイション Controlled in-mold casting of large steel ingots using induction variable power and variable frequency

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JPS6049846A (en) * 1983-08-29 1985-03-19 Sumitomo Heavy Ind Ltd Device for supplying powder in continuous casting plant
JPH081294A (en) * 1994-06-15 1996-01-09 Sumitomo Metal Ind Ltd Method and device for heating mold powder for continuous casting
KR100661821B1 (en) * 2000-12-26 2006-12-27 주식회사 포스코 Device and Method for preventing the Growth of Slag Bear in the Mold for Continuous Casting of Steel
KR100802477B1 (en) * 2006-08-24 2008-02-12 주식회사 포스코 Continuous casting machine and method

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KR101360607B1 (en) * 2012-05-03 2014-02-11 주식회사 포스코 Mold heating apparatus

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