KR20120001828A - Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same - Google Patents

Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same Download PDF

Info

Publication number
KR20120001828A
KR20120001828A KR1020100062405A KR20100062405A KR20120001828A KR 20120001828 A KR20120001828 A KR 20120001828A KR 1020100062405 A KR1020100062405 A KR 1020100062405A KR 20100062405 A KR20100062405 A KR 20100062405A KR 20120001828 A KR20120001828 A KR 20120001828A
Authority
KR
South Korea
Prior art keywords
height
immersion nozzle
blockage
index
blockage index
Prior art date
Application number
KR1020100062405A
Other languages
Korean (ko)
Other versions
KR101193850B1 (en
Inventor
권효중
문홍길
장진수
Original Assignee
현대제철 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대제철 주식회사 filed Critical 현대제철 주식회사
Priority to KR20100062405A priority Critical patent/KR101193850B1/en
Publication of KR20120001828A publication Critical patent/KR20120001828A/en
Application granted granted Critical
Publication of KR101193850B1 publication Critical patent/KR101193850B1/en

Links

Images

Classifications

    • 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
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/141—Plants for continuous casting for vertical casting
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/142—Plants for continuous casting for curved casting
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/143—Plants for continuous casting for horizontal casting
    • 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
    • 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

PURPOSE: A method of detecting the separation of inclusion of an entry nozzle and a continuous casting method using the same are provided to detect the separating point of inclusion from an entry nozzle and prevent defects due to entry of slab to following processes. CONSTITUTION: A method of detecting the separation of inclusion of an entry nozzle comprises next steps. A first height of a stopper to the amount of ingot steel discharged through an entry nozzle from a turn dish is obtained(S1). In a state the entry nozzle is clogged, a second height, which is the height of the stopper to discharge the ingot steel, is obtained(S3). Using the first and second heights, the clogging index of the entry nozzle is obtained(S5). A difference value, which is calculated by subtracting the clogging index of a second point from the clogging index of a first point, is obtained(S7).

Description

METHODS FOR DETECTING DROPPING ALIEN SUBSTANCE OF SUBMERGED ENTRY NOZZLE AND CONTINUOUS CASTING METHOD USING THE SAME}

The present invention relates to a method for detecting inclusion dropout of an immersion nozzle in a continuous casting and a continuous casting method relating thereto.

In general, a continuous casting machine is a facility for producing slabs of a constant size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle in a tundish and then supplying it as a mold for a continuous casting machine.

The continuous casting machine includes a ladle for storing molten steel, a continuous casting machine mold for cooling the tundish and the molten steel discharged from the tundish to form a casting having a predetermined shape, and a casting formed in the mold connected to the mold. It includes a plurality of pinch roller to move.

In other words, the molten steel tapping out of the ladle and tundish is formed of a slab (Slab) or bloom (Bloom), billet (Billet) having a predetermined width and thickness in the mold and is transferred through the pinch roller.

The present invention is to propose a method for increasing the productivity of continuous casting by detecting the dropping point of inclusions formed in the immersion nozzle in continuous casting.

In order to solve the above problems, an embodiment of the present invention, the inclusion drop detection method of the immersion nozzle, obtaining a first height of the stopper for the amount of molten steel discharged through the immersion nozzle in the steady state in the tundish; Acquiring a second height which is a height of a stopper for discharging the molten steel in the state in which the immersion nozzle is blocked; Obtaining a blockage index of the immersion nozzle using the first height and the second height; Obtaining a difference value obtained by subtracting the blockage index of the second time point from the blockage index of the first time point, wherein the first time point is earlier than the second time point; And determining that the inclusions of the immersion nozzle are dropped if the difference is a positive amount greater than a predetermined value.

According to an aspect of an embodiment of the present invention, the first height may be obtained by the following [Formula 1].

[Equation 1]

H 0 [mm] = discharge rate [ton / min] × a + b

H 0 is a first height and a and b are preset constants.

According to one embodiment of the present invention, the blockage index can be obtained by the following [Formula 2].

[Formula 2]

C (blocking index) = 1-H 0 / H

H 0 : 1st height (mm)

H: 2nd height (mm)

According to one embodiment of the present invention, the blockage index difference value can be obtained by the following [Equation 3].

[Equation 3]

Blockage Index Difference = Cl n -Min (Cl n +1 : Cl n +90 )

Cl n : Blockage index value at n seconds

Min (Cl n +1 : Cl n +90 ): Minimum blockage index between n + 1 and n + 90 seconds

n: seconds (sec)

Cl: blockage index

According to an embodiment of the present invention, the predetermined value may be 0.1 or more and less than 1.0.

In another embodiment of the present invention, a continuous casting method includes: obtaining a first blockage index indicating a degree of blockage at a first time point with respect to an immersion nozzle used in a continuous casting process; Obtaining a second blockage index indicating a degree of blockage of the immersion nozzle at a second point in time after the first point in time; And when the difference value obtained by subtracting the second blockage index from the first blockage index is greater than or equal to a predetermined value, determining that the inclusions of the immersion nozzle have been dropped, and thus performing a scarfing or downgrading of the slab.

Here, the first blockage index and the second blockage index can be obtained using the height of the stopper.

In addition, the predetermined value may be 0.1 or more and less than 1.0.

According to one embodiment of the present invention, in the continuous casting, when the molten steel is discharged into the mold, it is possible to detect the dropping time of the inclusions formed in the immersion nozzle. At this time, the slab manufactured is able to prevent the process cost and defects that may occur due to the input into the post-process, it is possible to expect cost reduction and quality improvement effect.

1 is a side view showing a continuous casting machine according to an embodiment of the present invention.
Figure 2 is a conceptual diagram for explaining the continuous caster of Figure 1 centered on the flow of molten steel (M).
Figure 3 is a graph showing the relationship between the height of the stopper and the discharge amount of the molten steel in the steady state associated with one embodiment of the present invention.
Figure 4 is a graph showing the weight of the ladle, the weight of the tundish, the casting speed, the blockage index, and the blockage change rate ratio over time associated with one embodiment of the present invention.
5 is a flowchart illustrating a inclusion drop detection method of an immersion nozzle according to an embodiment of the present invention.
6 is a flowchart illustrating a continuous casting method using the inclusion drop detection method of the immersion nozzle according to an embodiment of the present invention.

Hereinafter, the inclusion drop detection method and the continuous casting method of the immersion nozzle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description thereof is replaced with the first description.

Continuous casting is a casting method in which a casting or steel ingot is continuously extracted while solidifying molten metal in a mold without a bottom. Continuous casting is used to manufacture simple products such as squares, rectangles, circles, and other simple cross-sections, and slabs, blooms and billets, which are mainly for rolling.

The type of continuous casting machine is classified into vertical type, vertical bending type, vertical axis difference bending type, curved type and horizontal type. 1 and 2 illustrate a curved shape.

1 is a side view showing a continuous casting machine related to an embodiment of the present invention.

Referring to this drawing, the continuous casting machine may include a tundish 20, a mold 30, secondary cooling tables 60 and 65, a pinch roll 70, and a cutter 90.

The tundish 20 is a container that receives molten metal from the ladle 10 and supplies molten metal to the mold 30. Ladle 10 is provided in a pair, alternately receives molten steel to supply to the tundish 20. In the tundish 20, the molten metal supply rate is adjusted to the mold 30, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the non-metallic inclusions are separated.

The mold 30 is typically made of water-cooled copper and allows the molten steel to be primary cooled. The mold 30 forms a hollow portion in which molten steel is accommodated as a pair of structurally facing faces are opened. In manufacturing the slab, the mold 30 comprises a pair of barriers and a pair of end walls connecting the barriers. Here, the short wall has a smaller area than the barrier. The walls of the mold 30, mainly short walls, may be rotated to move away from or close to each other to have a certain level of taper. This taper is set to compensate for shrinkage caused by solidification of the molten steel M in the mold 30. The degree of solidification of the molten steel (M) will vary depending on the carbon content, the type of powder (steel cold Vs slow cooling), casting speed and the like depending on the steel type.

The mold 30 has a strong solidification angle or solidifying shell 81 (see FIG. 2) so that the casting extracted from the mold 30 maintains its shape and does not leak molten metal which is still less solidified. It serves to form. The water cooling structure includes a method of using a copper pipe, a method of drilling a water cooling groove in the copper block, and a method of assembling a copper pipe having a water cooling groove.

The mold 30 is oscillated by the oscillator 40 to prevent the molten steel from sticking to the wall of the mold. Lubricants are used to reduce friction between the mold 30 and the casting during oscillation and to prevent burning. Lubricants include splattered flat oil and powder added to the molten metal surface in the mold 30. The powder is added to the molten metal in the mold 30 to become slag, as well as the lubrication of the mold 30 and the casting, as well as the prevention of oxidative and nitrification of the molten metal in the mold 30, the insulation, and the non-metallic inclusions on the molten metal surface. It also performs the function of absorption. In order to inject the powder into the mold 30, a powder feeder 50 is installed. The part for discharging the powder of the powder feeder 50 faces the inlet of the mold 30.

The secondary cooling zones 60 and 65 further cool the molten steel that has been primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spray 65 spraying water while maintaining the solidification angle by the support roll 60 so as not to deform. Casting solidification is mostly achieved by the secondary cooling.

The drawing device adopts a multidrive method using a plurality of sets of pinch rolls 70 and the like so that the casting can be taken out without slipping. The pinch roll 70 pulls the solidified tip of the molten steel in the casting direction, thereby allowing the molten steel passing through the mold 30 to continuously move in the casting direction.

The cutter 90 is formed to cut continuously produced castings to a constant size. As the cutter 90, a gas torch, a hydraulic shear, or the like can be employed.

FIG. 2 is a conceptual view illustrating the continuous casting machine of FIG. 1 based on the flow of molten steel M. Referring to FIG.

Referring to this figure, the molten steel (M) is to flow to the tundish 20 in the state accommodated in the ladle (10). For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzle 15 extends to submerge the molten steel in the tundish 20 so that the molten steel M is not exposed to air and oxidized and nitrided. The case where molten steel M is exposed to air due to breakage of shroud nozzle 15 is called open casting.

The molten steel M in the tundish 20 flows into the mold 30 by a submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed in the center of the mold 30 so that the flow of molten steel M discharged from both discharge ports of the immersion nozzle 25 can be symmetrical. The start, discharge speed, and stop of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 installed in the tundish 20 corresponding to the immersion nozzle 25. Specifically, the stopper 21 may be vertically moved along the same line as the immersion nozzle 25 to open and close the inlet of the immersion nozzle 25.

The molten steel M in the mold 30 starts to solidify from the part in contact with the wall surface of the mold 30. This is because heat is more likely to be lost by the mold 30 in which the periphery is cooled rather than the center of the molten steel M. The rear portion along the casting direction of the strand 80 is formed by the non-solidified molten steel 82 being wrapped around the solidified shell 81 in which the molten steel M is solidified by the method in which the peripheral portion first solidifies.

As the pinch roll 70 (FIG. 1) pulls the tip portion 83 of the fully solidified strand 80, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The uncondensed molten steel 82 is cooled by the spray 65 for spraying cooling water in the course of the above movement. This causes the thickness of the uncooled steel (82) in the strand (80) to gradually decrease. When the strand 80 reaches a point 85, the strand 80 is filled with the solidification shell 81 in its entire thickness. The solidified strand 80 is cut to a predetermined size at the cutting point 91 and divided into a product P such as a slab.

Here, when the height of the stopper 21 rises in the discharge of the molten steel M discharged from the tundish 20 to the mold 30, the discharge amount of the molten steel M is determined according to the rising degree. By the way, when molten steel is Ca untreated steel, the fused material, such as alumina, adheres to the inner wall of the immersion nozzle 25, and a clogging phenomenon arises in the immersion nozzle 25 by this adhesion. If clogging occurs in the immersion nozzle 25, in order to inject a certain amount of molten steel (M) into the mold 30, it is necessary to raise the height of the stopper 21.

By using this principle, the reference height of the stopper 21, that is, the discharge amount of the molten steel M discharged from the immersion nozzle 25 in the normal state and the actual height of the stopper 21 for discharging the reference amount of molten steel are determined. The degree of clogging of the immersion nozzle 25 can be estimated. The degree of blockage is defined as a blockage index, and this blockage index can be obtained by using the height of the stopper as described above. In addition, the blockage index may be obtained in consideration of the influence of the flow rate of argon gas Ar introduced into the immersion nozzle and the tundish residue.

In this detailed description, for the sake of simplicity, a method of obtaining a blockage index according to the stopper height will be described in detail with reference to FIG. 3. It is to be understood that the present invention is not limited thereto and that the blockage index of the immersion nozzle can be obtained by various methods as described above. That is, the blockage index may be obtained based on the amount of argon gas Ar introduced into the immersion nozzle.

Hereinafter, a method of obtaining the blockage index through the stopper height will be described in detail with reference to FIGS. 3 and 4.

3 is a graph of the discharge amount and the height of the stopper in the immersion nozzle in the steady state. The vertical axis is the height of the stopper (mm), and the horizontal axis is the discharge amount per minute (ton / min) of the molten steel (M). As shown, the height of the stopper 21 and the discharge amount of the molten steel have a relation of linear function, and the relation is as follows.

[Equation 1]

H 0 = Discharge amount × a + b

H 0 : Stopper height in steady state immersion nozzle (mm), a and b are constants

Discharge amount: ton / min

If nozzle clogging occurs under a constant molten steel discharge amount, the height of the stopper is raised to compensate for the decrease in the opening area of the immersion nozzle 25. In consideration of this phenomenon, the nozzle clogging index is determined by Equation 2.

[Equation 2]

Cl (blocking index) = 1-H 0 / H

H 0 : Height of the stopper in the normal immersion nozzle (mm)

H: Height of stopper in immersion nozzle in blocked state (mm)

The blockage index thus obtained is obtained over time, and the dropping point of the inclusions formed in the immersion nozzle can be detected through the distribution of the blockage index. That is, if the blockage index at the first time point and the blockage index at the second time point are obtained, and the difference value is a positive real number larger than a predetermined value, it is determined that the inclusions of the immersion nozzle are dropped. Here, the difference value may be obtained by Equation 3 below.

[Equation 3]

Blockage Index Difference = Cl n -Min (Cl n +1 : Cl n +90 )

Cl n : Blockage index value at n seconds (blockage index at the first time point)

Min (Cl n +1 : Cl n +90 ): The lowest blockage index between n + 1 and n + 90 seconds (blockage index at the second time point)

n: seconds (sec)

4 is a graph showing the weight of the ladle, the weight of the tundish, the casting speed, the blockage index, and the blockage change rate ratio over time.

In Fig. 4, reference numeral (a) denotes a line for the amount of molten steel of the ladle over time, reference numeral (b) denotes a line for the amount of molten steel of the tundish over time, and reference numeral (c) corresponds to the time It is a line about casting speed (that is, the meaning of discharge amount of molten steel), and (D) is a line about the blockage index with time.

As shown, the clogging index of the immersion nozzle generally rises over time. However, at some point A, the value of the blockage index rapidly decreases. This point is when the inclusion of the immersion nozzle is dropped. Therefore, it can be seen that after this point, the address speed returns to normal speed again (see line (c)).

5 is a flowchart illustrating a method for detecting inclusions of an immersion nozzle according to an embodiment of the present invention.

As shown, first, the first height of the stopper with respect to the amount of molten steel discharged through the immersion nozzle in the steady state in the tundish is obtained (S1). Since the first height acquisition has been described with reference to FIG. 3, description thereof will be omitted. Then, the continuous casting process is actually carried out to obtain a second height which is the height of the stopper for discharging the molten steel amount during the actual process, that is, the immersion nozzle is blocked (S3). The blockage index of the immersion nozzle is obtained using the first height and the second height (S5). Since the blockage index has been described above, detailed description thereof will be omitted. A difference value obtained by subtracting the blockage index at the second time point from the blockage index at the first time point is obtained. The first time point is earlier than the second time point (S7). If the difference is a positive real number larger than a predetermined value, it is determined that the inclusions of the immersion nozzle are dropped (S9). The predetermined value may be 0.1 or more and less than 1.0. That is, as shown in Figure 4, even if there is no dropout of the inclusions, the difference value of the blockage index may be a positive real number at a fine value according to the discharge degree of the molten steel. In order to prevent such an error, the predetermined value is preferably 0.1 or more. In addition, the difference value may not be greater than 1.0. Therefore, the predetermined value is limited from 0.1 to 1.0.

According to one embodiment of the present invention having the above-described configuration, it is possible to detect the dropping point of the inclusions formed in the immersion nozzle. At this time, the slab manufactured is able to prevent the process cost and defects that may occur due to the input into the post-process, it is possible to expect cost reduction and quality improvement effect.

6 is a flowchart illustrating a continuous casting method using the inclusion drop detection method of the immersion nozzle according to an embodiment of the present invention.

As shown in FIG. 6, first, a first blockage index indicating a blockage degree at a first time point is obtained for the immersion nozzle used in the continuous casting process (S11). Next, a second blockage index indicating a degree of blockage of the immersion nozzle at a second point in time after the first point in time is obtained (S13). As described above, the blockage indices may be obtained using the height of the stopper. And the amount of argon gas introduced into the immersion nozzle. When the difference value obtained by subtracting the second blockage index from the first blockage index is greater than or equal to the predetermined value, it is determined that the inclusions of the immersion nozzle are dropped, and the slab is thus scarfed or downgraded. The predetermined value may be 0.1 or more and less than 1.0. That is, as shown in Figure 4, even if there is no dropout of the inclusions, the difference value of the blockage index may be a positive real number at a fine value according to the discharge degree of the molten steel. In order to prevent such an error, the predetermined value is preferably 0.1 or more. In addition, the difference value may not be greater than 1.0. Therefore, the predetermined value may be set from 0.1 to 1.0. If the difference value obtained by subtracting the second blockage index from the first blockage index is less than or equal to the predetermined value, it is determined that dropouts do not occur and normal operation is maintained (S15).

According to one embodiment of the present invention, in the continuous casting, when the molten steel is discharged into the mold, the dropping point of the inclusions formed in the immersion nozzle is detected and, accordingly, the slab containing the inclusions is scarfed or down. By graded, process costs and defects can be prevented in advance, resulting in cost reduction and quality improvement.

10: ladle 15: shroud nozzle
20: tundish 25: immersion nozzle
30: mold 40: mold oscillator
50: powder feeder 51: powder layer
52: liquid fluidized bed 53: lubricating layer
60: support roll 65: spray
70: pinch roll 80: strand
81: solidified shell 82: unsolidified molten steel
83: tip 85: solidification completion point
87: oscillation mark 88: bulging area

Claims (8)

Obtaining a first height of the stopper for the amount of molten steel discharged through the immersion nozzle in a steady state in a tundish;
Acquiring a second height which is a height of a stopper for discharging the molten steel in the state in which the immersion nozzle is blocked;
Obtaining a blockage index of the immersion nozzle using the first height and the second height;
Obtaining a difference value obtained by subtracting the blockage index of the second time point from the blockage index of the first time point, wherein the first time point is earlier than the second time point; And
And determining that the inclusions of the immersion nozzle have dropped if the difference value is a positive real number greater than a predetermined value.
The method of claim 1,
And the first height is obtained by the following equation.
H 0 [mm] = discharge rate [ton / min] × a + b
H 0 is a first height and a and b are preset constants.
The method of claim 2,
The clogging index is obtained by the following equation, the inclusion drop detection method of the immersion nozzle.

C (blocking index) = 1-H 0 / H
H 0 First height (mm)
H: 2nd height (mm)
The method of claim 3, wherein
The clogging index difference value is obtained by the following equation, the inclusion drop detection method of the immersion nozzle.
Blockage Index Difference = Cl n -Min (Cl n +1 : Cl n +90 )
Cl n : Blockage index value at n seconds
Min (Cl n +1 : Cl n +90 ): Minimum blockage index between n + 1 and n + 90 seconds
n: seconds (sec).
Cl: blockage index
The method of claim 1,
The predetermined value is an inclusion drop detection method of the immersion nozzle, which is 0.1 or more and less than 1.0.
Obtaining a first blockage index indicating a degree of blockage at a first time point for the immersion nozzle used in the continuous casting process;
Obtaining a second blockage index indicating a degree of blockage of the immersion nozzle at a second point in time after the first point in time; And
If the difference between the first blockage index minus the second blockage index is more than a predetermined value, it is determined that the inclusions of the immersion nozzle has been eliminated, and comprising the step of scarfing or downgrading the slab accordingly.
The method according to claim 6,
Wherein the first blockage index and the second blockage index are obtained using the height of the stopper.
The method according to claim 6,
The said predetermined value is 0.1 or more and less than 1.0, The continuous casting method.
KR20100062405A 2010-06-30 2010-06-30 Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same KR101193850B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20100062405A KR101193850B1 (en) 2010-06-30 2010-06-30 Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20100062405A KR101193850B1 (en) 2010-06-30 2010-06-30 Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same

Publications (2)

Publication Number Publication Date
KR20120001828A true KR20120001828A (en) 2012-01-05
KR101193850B1 KR101193850B1 (en) 2012-10-23

Family

ID=45609327

Family Applications (1)

Application Number Title Priority Date Filing Date
KR20100062405A KR101193850B1 (en) 2010-06-30 2010-06-30 Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same

Country Status (1)

Country Link
KR (1) KR101193850B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101400042B1 (en) * 2012-04-26 2014-05-30 현대제철 주식회사 Method for producing high quality slab
KR101400035B1 (en) * 2012-01-31 2014-06-27 현대제철 주식회사 Method for producing high quality slab

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101505156B1 (en) * 2013-04-30 2015-03-23 현대제철 주식회사 Continuous casting method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0659530B2 (en) 1985-07-23 1994-08-10 川崎製鉄株式会社 Automatic stopping method at the end of casting in a continuous casting machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101400035B1 (en) * 2012-01-31 2014-06-27 현대제철 주식회사 Method for producing high quality slab
KR101400042B1 (en) * 2012-04-26 2014-05-30 현대제철 주식회사 Method for producing high quality slab

Also Published As

Publication number Publication date
KR101193850B1 (en) 2012-10-23

Similar Documents

Publication Publication Date Title
KR101109450B1 (en) Method for estimating clogging degree of submerged entry nozzle and method for estimating time of changing submerged entry nozzle
KR101246207B1 (en) Device for estimating a pin-hole defect of solidified shell in continuous casting process and method therefor
KR101193850B1 (en) Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same
KR101368350B1 (en) Device for prediction of carbon increase in molten steel and method thereof
KR101185919B1 (en) Method for warning clogging of submerged entry nozzle
KR101277707B1 (en) Method for decreasing pin-hole defect in continuous casting process
KR101224982B1 (en) Method for estimating steel component during mixed grade continuous casting
KR101159598B1 (en) Method for estimating mold powder's viscosity
KR101505406B1 (en) Method for predicting quality of slab
KR101175629B1 (en) Apparatus for mounting shroud nozzle
KR101412536B1 (en) Device for forecasting number of continuous-continuous casting on continuous casting process and method therefor
KR101277627B1 (en) Device for estimating breakout of solidified shell in continuous casting process and method therefor
KR101443585B1 (en) Method for estimating clogging degree of submerged entry nozzle
KR101443586B1 (en) Method for continuous-continuous casting
KR101400047B1 (en) Control method for casting of ultra low carbon steel
KR101159604B1 (en) Apparatus for distinguishing non-symmetric flow in mold and method for controlling non-symmetric folw
KR101204933B1 (en) Apparatus for collecting sample of powder and method for collecting sample of powder
KR20130034299A (en) Device for controlling mold narrow side in continuous casting process and method therefor
KR101159613B1 (en) Apparatus for distinguishing taper of mold in continuous casting and method for distinguishing taper in continuous casting
KR101175632B1 (en) Continuous casting apparatus and method therefor
KR101368352B1 (en) Method for controlling temperature of casting
KR101400036B1 (en) Separatimg method for slab of high clean steel
KR101377484B1 (en) Method for estimating carbon-increasing of molten steel
KR101344902B1 (en) Control method for quality of steel
KR101435117B1 (en) Method for stabilizing meniscus in continuous casting

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20150930

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20160927

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20171013

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20181002

Year of fee payment: 7