KR101344899B1 - Realignment method for spray nozzles of cooling water on continuous casting process - Google Patents

Abstract

The present invention relates to a method of arranging a coolant jet nozzle during continuous casting for arranging nozzles for spraying coolant onto the surface of the cast to cool the cast during continuous casting. The first step of calculating the non-aqueous overlap portion Lo, which is a region where the coolant sprayed from a plurality of injection nozzles provided in the width direction of the cast steel, overlaps each other by the following equation 1, and the non-aqueous overlap portion Lo calculated above: Provided is a method for arranging a cooling water jet nozzle during continuous casting, comprising a second step of rearranging the plurality of rows of jet nozzles arranged in the longitudinal direction of the cast piece according to the size.

Description

REPLANTING METHOD FOR SPRAY NOZZLES OF COOLING WATER ON CONTINUOUS CASTING PROCESS}

The present invention relates to a method for arranging a coolant spray nozzle during continuous casting, and more particularly, to a method for arranging a coolant spray nozzle for continuous casting for arranging a nozzle for spraying coolant onto the surface of a cast to cool a playing cast during continuous casting. It is about.

In general, a continuous casting machine is a facility for producing cast steel of a certain size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle (Tundish) and then supplied to a continuous casting machine mold.

The continuous casting machine includes a ladle for storing molten steel, a casting mold for forming a tundish and a molten steel that is guided in the tundish first to form a cast slab having a predetermined shape, and a casting member connected to the mold, A plurality of pinch rolls and the like. The molten steel introduced from the ladle and the tundish is formed into a cast slab having a predetermined width, thickness and shape in the mold and is transported through the pinch roll. The slab transported through the pinch roll is cut by a cutter to have a predetermined shape Slabs, blooms, billets, and the like.

Related prior arts include Korean Patent No. 1082231 (Registration Date: Nov. 3, 2011, Name: Spray Nozzle Device for Continuous Casting Machine).

The present invention is to provide a method for arranging a coolant spray nozzle during continuous casting that can effectively arrange the spray nozzles for spraying the coolant so that the coolant can be uniformly sprayed on the surface of the casting cast in the secondary cooling table during the continuous casting.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above.

In the continuous casting of the present invention for achieving the above object, the cooling water injection nozzle arrangement method, the cooling water is injected from the plurality of injection nozzles installed in the width direction of the casting cast to cool the playing cast is installed on the secondary cooling table overlap each other Repositioning the plurality of rows of the spray nozzles provided in the longitudinal direction of the cast piece according to the first step of calculating the non-numerical overlapping portion Lo, which is a region to be, by the following relational formula 1, and the size of the non-numbered overlapping portion Lo calculated above. A second step may be included.

Relationship 1

Here, L is the interval between the spray nozzles, k1 is a negative constant determined through the experiment of measuring the number distribution of the spray nozzles installed in the continuous casting process, k2 is a test of the number distribution of the spray nozzles installed in the continuous casting process Is a positive constant determined by

Specifically, in the second step,

When the non-numerical overlap (Lo) value satisfies Equation 2 below, in the secondary cooling zone composed of the plurality of rows, the nozzles of the N + 1 rows are moved by 1/2 Lo value based on an arbitrary N rows. Can be relocated by moving in the width direction.

Relation 2

In the second step,

When the non-numerical overlap (Lo) value satisfies Equation 3 below, in the secondary cooling zone composed of the plurality of rows, the nozzles of the N + 1 rows by 1/2 Lo value are set by the value of any N rows. Reposition by moving in the width direction, the nozzle of the N + 2 rows can be relocated by moving in the width direction of the cast piece by 1 / 2Lo value based on the N + 1 row.

Relation 3

As described above, the present invention allows the cooling water to be uniformly sprayed on the surface of the cast slab in the secondary cooling zone during the continuous casting, thereby improving the quality of the produced cast.

1 is a conceptual diagram showing a continuous casting machine according to an embodiment of the present invention mainly on the flow of molten steel.
Fig. 2 is a view schematically showing the injection nozzle arrangement of a secondary cooling zone of a continuous casting machine according to the present invention. Fig.
3 is a view for explaining the non-numeric overlapping portion formed on the surface of the playing cast according to the present invention.
4 is a view showing the non-aqueous characteristics of the cooling water injected through the two injection nozzles related to the present invention.
5 is a view showing a non-uniform cooling water injection in the playing cast width direction related to the present invention.
6 is a view showing a state in which cooling water injection is uniform in the width direction of the playing cast associated with the present invention.
7 is a flowchart illustrating a method of arranging cooling water injection nozzles in a continuous casting process according to an embodiment of the present invention.
8 is a flowchart illustrating a nozzle repositioning method according to an embodiment of the present invention in order.
9 is a diagram illustrating a method for rearranging nozzles in accordance with an embodiment of the present invention.
10 is a view showing a method for repositioning a nozzle according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a conceptual diagram showing a continuous casting machine according to an embodiment of the present invention mainly on the flow of molten steel.

Continuous casting is a casting process in which a molten metal is continuously cast into a bottomless mold while continuously drawing a steel ingot or steel ingot. Continuous casting is used to make long products of simple cross-section, such as square, rectangular or round, and mainly slabs, blooms or billets, which are materials for rolling.

The continuous casting machine may include a ladle 10 and a tundish 20, a mold 30, secondary cooling bands 60 and 65, a pinch roll 70, and a cutter 90, as shown .

The tundish 20 is a container that receives the molten metal from the ladle 10 and supplies the 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 supply rate of the molten metal flowing into the mold 30 is controlled, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the nonmetallic 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 has a pair of structurally opposed faces open to form a hollow portion for receiving molten steel. In the case of manufacturing the slab, the mold 30 includes a pair of barriers and a pair of end walls connecting the barriers. Here, the end wall has a smaller area than the barrier. The walls of the mold 30, mainly short walls, may be rotated away from or close to each other to have a certain level of taper.

The mold 30 serves to form a strong solidification angle or solidified shell 81 so that the cast steel drawn from the mold maintains a certain shape and a molten metal which is still less solidified does not flow out. Do it. The water-cooling structure includes a method using a copper tube, a method of water-cooling the copper block, and a method of assembling a copper tube having a water-cooling groove.

The mold 30 is oscillated to prevent the molten steel from adhering to the wall of the mold, and powder to prevent burning and to reduce friction between the mold 30 and the solidification shell 81 during oscillation. Lubricants such as Powder are used. The powder is added to the molten metal in the mold to become slag and functions not only to lubricate the mold 30 and the solidifying shell but also to prevent oxidation and nitriding of the molten metal in the mold and to maintain the temperature and to absorb nonmetallic inclusions floating on the surface of the molten metal do.

The secondary cooling zones 60 and 65 further cool the molten steel primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spraying means 65 for spraying water while being maintained by the support roll 60 so that the coagulation angle is not deformed. The solidification of the cast steel is mostly made by the secondary cooling.

The drawing device adopts a multidrive method using a pair of pinch rolls 70 and the like so as to pull out the cast pieces 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.

Continuously produced cast pieces are cut to a certain size by a predetermined cutter (not shown).

That is, the molten steel M flows 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 so as to be submerged in the molten steel in the tundish 20 so that the molten steel M is not exposed to the air and oxidized and nitrided.

The molten steel M in the tundish 20 flows into the mold by a submerged entry nozzle 25 extending into the mold. The immersion nozzle 25 is disposed at the center of the mold 30 so that the flow of the molten steel M discharged from both the discharge ports of the immersion nozzle 25 can be made 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 starts to solidify from the part in contact with the wall surface of the mold 30. This is because the periphery of the molten steel M is liable to lose heat by the water-cooled mold 30. The rear portion along the casting direction of the cast slab 80 is formed into a shape in which the non-solidified molten steel 82 is wrapped in the solidifying shell 81 by the method in which the peripheral portion first coagulates.

As the pinch roll 70 pulls the front end portion 83 of the completely cast solid cast steel 80, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The non-solidified molten steel (82) is cooled by the spraying means (65) for spraying the cooling water in the up-shifting process. This causes the thickness of the non-solidified molten steel (82) to gradually decrease in the cast steel (80). When the cast steel 80 reaches a point 85, the cast steel 80 is filled with the solidification shell 81 of the entire thickness. The solidification casting 80 having been solidified is cut to a predetermined size at the cutting point 91 and is divided into a slab P such as a slab or the like.

As described above, the secondary cooling zones 60 and 65 further cool the molten steel primarily cooled in the mold 30, and spray means for injecting water, that is, cooling water, onto the surface of the cast steel 80 ( 65) cool the surface of the cast steel. As shown in FIG. 2, the spray means 65 is provided with a plurality of spray nozzles 100 (hereinafter referred to as 'nozzles') and arranged in a plurality of rows to spray cooling water onto the surface of the cast steel 80. . A plurality of nozzles 100 are installed in one row constituting a plurality of rows at regular intervals. The plurality of rows of spray means 65 arranged as described above continuously serves to solidify the sprayed water by spraying the cooling water on the surface of the playing piece 80 while the playing piece 80 moves in the continuous casting direction.

Therefore, as shown in FIG. 3, the surface of the playing piece 80 overlaps with the coolant sprayed through one nozzle 100a and the coolant sprayed from the nozzle 100b disposed immediately adjacent to the sprayed water 80. That is, the non-numeric overlapping part Lo occurs in a predetermined region between the nozzle 100a and the nozzle 100b as shown in FIG. 3.

In order to improve the quality of the cast (P) produced during continuous casting, it is important to uniformly cool the surface of the casting cast 80, to maintain a uniform temperature distribution on the surface of the casting cast 80 during cooling . However, the coolant may not be uniformly sprayed on the surface of the cast steel 80 by the spray form of the coolant sprayed by the plurality of rows of spray nozzles shown in FIG. 2.

That is, since the coolant spray type is not the same according to the spray nozzles, the size of the nonaqueous overlap portion Lo varies according to the spray nozzles, and according to the generated length of the nonaqueous overlap portion Lo, a specific portion of the surface of the cast steel 80 is The amount of cooling water is injected more than other places, and relatively less portion of the cooling water is injected. For this reason, the surface of the cast steel 80 may not be uniformly cooled, but the quality of the cast steel P that is produced unevenly may be lowered. Therefore, it is necessary to change the arrangement of the nozzles according to the overlapping area of the coolant sprayed through the nozzle, that is, the length of the nonaqueous overlapping portion Lo, so that the coolant sprayed on the surface of the cast steel 80 is evenly overlapped.

Specifically, as illustrated in FIG. 4, non-aqueous characteristics of the cooling water injected from each nozzle were analyzed while spraying the cooling water on any two nozzles. Referring to the drawings, when the heat transfer amount (vertical axis) by the coolant is measured in the left and right widths (horizontal axis) around the center of the gap between the two spray nozzles, the non-aqueous overlap portion Lo at the center point of the two nozzles is measured. It can be seen that the surface of the cast steel 80, which is cooled by the nozzle as a whole, is not evenly cooled accordingly.

In addition, in the case of continuous casting in which the nozzles as shown in FIG. 4 are arranged in a plurality of rows as shown in FIG. 2, in the non-numbered overlapping portion Lo generated in the width direction of the casting pieces as shown in FIG. In a portion where the surface of the solidification is solidified a lot, and the non-numeric overlapping portion Lo is not generated, non-uniform solidification, that is, uneven cooling occurs along the width of the performance casting piece where the surface casting solidification of the performance casting piece 80 is difficult. .

Therefore, as shown in FIG. 6, the surface of the cast steel 80 is uniformly cooled to reposition the nozzles formed in a plurality of rows along the length of the non-superimposed portion Lo so as to improve the quality of the produced product. Should be.

7 is a flowchart illustrating a method of arranging a coolant jet nozzle according to an exemplary embodiment of the present invention.

Referring to this, first, a nonaqueous overlap part Lo, which is a region where cooling water injected from a plurality of injection nozzles installed in the width direction of the playing cast, overlaps each other, is calculated to cool the playing cast (S10). In this case, the non-numerical overlapping part Lo may be calculated by the following Equation 1.

Relationship 1

Here, L is the interval between the spray nozzles, k1 is a negative constant determined through the experiment of measuring the number distribution of the spray nozzles installed in the continuous casting process, k2 is a test of the number distribution of the spray nozzles installed in the continuous casting process Is a positive constant determined by

The non-numeric overlap (Lo) value calculated by Equation 1 should not exceed the L value, which is the interval between injection nozzles. The Lo value is calculated through the L value, which is the interval between any two injection nozzles, the k1 value is determined by a negative constant, k2 is also determined by a positive constant, and the Lo value calculated by these constants is L The range must not exceed the value.

In this case, k1 and k2 values are determined through experiments of measuring the number distribution of the spray nozzles installed in the continuous casting process, and are values determined by the experiment.

3, the Lo value may not exceed the L value because the non-numbered overlapping part Lo is formed between the gaps L between the nozzles. In addition, since the non-number overlap portion Lo means a portion where the cooling water overlaps, this value cannot be negative.

As described above, since the k1 and k2 values are constant values derived through non-aqueous distribution experiments for the spray nozzles arranged during continuous casting, Lo values derived by the relational equation 1 made through them do not exceed L and are negative. Is calculated as

The plurality of rows provided in the longitudinal direction of the performance casting cast 80 so that the cooling water sprayed on the performance casting cast 80 uniformly sprayed on the surface of the performance casting cast 80 according to the size of the non-numbering overlap (Lo) value calculated in this way Reposition the injection nozzle (S20).

At this time, the rearrangement of the main nozzle may be performed in the order shown in FIG. Referring to FIG. 8, when the non-numerical overlap (Lo) value determined as described above satisfies the following relation 2, in the secondary cooling zone composed of the plurality of rows, N is based on any N columns. Move the spray nozzle of +1 row in the width direction of the cast steel by 1 / 2Lo.

Relation 2

In detail, when the non-superimposed portion Lo is greater than or equal to 1 / 2L, i.e., the size of the non-superimposed superimposed portion Lo is greater than or equal to half of the interval between the spray nozzles. In this case, the injection nozzles of N + 1 rows spaced apart from the N rows at regular intervals are rearranged on the basis of N rows, which are any one row in the secondary cooling zones arranged in a plurality of rows. At this time, N + 1 column is fixed after moving in parallel with 1 / 2Lo value in the width direction of cast piece based on N column.

In this case, the non-numbered overlapping portion Lo of the cooling water sprayed through the nozzles installed at a predetermined interval in the N rows and the non-numbered overlapping portion Lo of the cooling water sprayed through the nozzles installed at the predetermined intervals in the N + 1 rows are 1/2 Lo. In the width direction of the cast piece. In other words, when the cast steel 80 continues to move in the casting direction, the non-superimposed portion Lo of the coolant sprayed in the N rows and the non-superimposed overlap Lo injected in the N + 1 rows are formed on the surface of the cast steel 80. In different positions. Therefore, since the non-numeric overlapping portion (Lo) is not formed at the same position continuously in the longitudinal direction of the performance casting slab 80, the non-numeric overlapping portion (Lo) is formed alternately at positions separated by 1 / 2Lo value from each other, so that the performance casting cast (80) Cooling water may be sprayed uniformly on the surface of the.

9 shows the non-aqueous distribution of cooling water by the spray nozzle rearranged by this method. Referring to this, as described above, the non-numbered overlapping portion Lo of the N-rows indicated by the black triangles and the non-numbered overlapping portion Lo of the N + 1-rows indicated by the hollow triangles are not positioned on the same line in the longitudinal direction of the cast piece. It is formed at the position moved in the width direction of the cast piece by 1 / 2Lo value. Therefore, the non-aqueous overlap portion Lo is uniformly positioned on the surface of the performance cast piece 80 continuously moving in one direction, so that only one portion in a straight line may not be intensively cooled. Therefore, as shown in FIG. 9, the amount of cooling water injected throughout the cast piece may be relatively uniform.

In addition, in the present invention, when the calculated non-numerical overlap (Lo) value satisfies the following relational expression 3, in the secondary cooling zone composed of the plurality of rows, N + 1 column is 1 based on an arbitrary N column. Reposition by moving in the width direction of the cast piece by the value of / 2Lo, and relocate by moving the width direction of the cast piece by 1 / 2Lo value based on N + 1 column.

Relation 3

In detail, when the non-numerical overlap (Lo) value is smaller than or equal to 1 / 2L and greater than or equal to 1 / 3L, the N-column, which is any one row in the secondary cooling stage arranged in a plurality of rows, is based on N columns. In this case, the N + 1 columns spaced apart from the N columns at regular intervals and the N + 2 columns spaced apart from the N + 1 columns are rearranged. At this time, N + 1 column is fixed after moving in parallel with 1 / 2Lo value in the width direction of cast piece based on N column. After rearranging the N + 1 rows as described above, the N + 2 rows are moved in parallel by 1 / 2Lo in the width direction of the cast piece based on the N + 1 rows and then fixed.

When rearranged in this way, the non-numbered overlapping portion Lo of the cooling water sprayed through the nozzles installed at predetermined intervals in the N rows and the non-numbered overlapping portion Lo of the cooling water sprayed through the nozzles installed at the predetermined intervals in the N + 1 rows and N + 2 rows. Are each half in the width direction of the cast piece. That is, when the cast piece 80 continues to move in the casting direction, the non-numbered overlapping portions Lo of the cooling water injected in the N rows and the non-numbered overlapping portions Lo of the N + 1 rows and the N + 2 rows are respectively injected. It is formed at different positions on the surface of the cast piece (80). Therefore, since the non-numeric overlapping portion (Lo) is not formed at the same position continuously in the longitudinal direction of the performance casting slab 80, the non-numeric overlapping portion (Lo) is formed alternately at positions separated by 1 / 2Lo value from each other, so that the performance casting cast (80) Cooling water may be sprayed uniformly on the surface of the.

Fig. 10 shows the non-aqueous distribution of the cooling water by the spray nozzles rearranged by this method. Referring to this, as described above, the non-numerical overlapping portion Lo of the N column indicated by the black triangle, the non-numbered overlapping portion Lo of the N + 1 column indicated by the hollow triangle, and the non-numbered overlapping portion Lo of the N + 2 column indicated by the horizontal line Are not located on the same line as each other in the longitudinal direction of the cast pieces, but are formed at positions moved in the width direction of the cast pieces by a value of 1 / 2Lo relative to each column. Therefore, the non-aqueous overlap portion Lo is uniformly positioned on the surface of the performance cast piece 80 continuously moving in one direction, so that only one portion in a straight line may not be intensively cooled. Therefore, as shown in FIG. 10, the amount of cooling water injected throughout the cast piece may be relatively uniform.

In the present invention, the N + 1 column may be rearranged based on an arbitrary N column based on the calculated Lo value, or the N + 1 and N + 2 columns may be rearranged based on the N column. According to the characteristics of the nozzle, the shape of the coolant sprayed through the nozzle may draw a sharp line, or may have a rounded silhouette, so the nozzle may be N + 1 depending on the length of the nonaqueous overlap (Lo) generated. You can rearrange up to ten rows, or even N + 2 rows.

On the other hand, the nozzle repositioning result which concerns on an Example was shown in Table 1.

division L (1/3) L (1/2) L Lo n (1/2) Lo Example 1 450 150 225 220 3 110 Example 2 650 217 325 340 2 170 Example 3 650 217 325 267 3 134

In Table 1, L is the spacing between the spray nozzles, Lo is the non-numerical overlap (Lo) length, and n is the nozzle array displacement. The nozzle array movement number n is a number indicating how many rows are rearranged in the nozzle relocation described above, and is represented by 2 when the N + 1 rows are rearranged based on the N rows, and the N + 1 and N columns based on the N rows. In case of rearrangement of the +2 column, it is indicated as 3.

Referring to Table 1 in detail, in the case of Example 1, L is measured first, and then the coolant injection characteristics are tested to derive k1 and k2 values to calculate Lo values by the relational formula (1). Comparing the Lo value 220 calculated as described above with the 1 / 3L value and the 1 / 2L value, which are calculated in advance, the calculated Lo value is larger than the 1 / 3L value of 150 and less than the 1 / 2L value of 225, based on the N column. We conclude that we need to rearrange columns N + 1 and N + 2. At this time, N + 1 columns are moved in parallel in the width direction of the cast piece by 110 (1/2) Lo value based on N columns. In addition, N + 2 rows are rearranged by moving in the width direction of the cast piece by 110 (1/2) Lo based on N + 1 rows.

In addition, in the case of Example 2, after measuring L first, the cooling water injection characteristics are tested to derive k1 and k2 values to calculate Lo values by the relational expression (1). When the Lo value 340 calculated as described above is compared with the 1 / 3L value and 1 / 2L value, which are calculated in advance, the calculated Lo value is larger than the 1 / 2L value of 325, so that only N + 1 columns are used based on N columns. You conclude that you need to relocate. At this time, N + 1 rows are rearranged by moving in the width direction of the cast piece by 170, which is (1/2) Lo, based on N columns.

Finally, in the case of Example 3, after measuring L first, the cooling water injection characteristics are tested to derive k1 and k2 values to calculate Lo values by the relational expression (1). Comparing the Lo value 267 calculated as described above with the 1 / 3L value and 1 / 2L value, which are calculated in advance, the calculated Lo value is smaller than the 1 / 3L value of 217 and smaller than the 1 / 2L value of 325, based on the N columns. We conclude that we need to rearrange columns N + 1 and N + 2. At this time, N + 1 columns are moved in the width direction of the cast piece by 134, which is (1/2) Lo, based on N columns. In addition, N + 2 columns are rearranged in the width direction of the cast piece by 134, which is a (1/2) Lo value, based on N + 1 columns.

The unit of travel distance used in the above embodiments is mm

As such, by disposing the spray nozzles installed in the secondary cooling stand during the continuous casting by the nozzle repositioning method of the present invention, the cooling water may be uniformly sprayed onto the surface of the cast steel 80 to be produced, thereby producing high quality cast steel P. There is an effect that can be obtained.

The method of arranging the coolant spray nozzle in the continuous casting as described above is not limited to the configuration and operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

10: Ladle 20: Tundish
30: mold 51: powder layer
60: Support roll 65: Spray means
80: playing piece 81: solidification shell
82: unsolidified molten steel 83: tip
85: Solidification completion point 90: Cutter
91: Cutting point

Claims (3)

A first non-aqueous portion (Lo), which is a region in which cooling water sprayed from a plurality of injection nozzles installed in the width direction of the playing cast and overlaps each other, is installed in the secondary cooling table to cool the playing cast; step; And
And a second step of rearranging the plurality of rows of the spray nozzles installed in the longitudinal direction of the cast piece according to the size of the non-numerical overlapping portion Lo calculated as described above.
In the second step,
When the non-numerical overlap (Lo) value satisfies Equation 2 below, in the secondary cooling zone composed of the plurality of rows, the nozzles of the N + 1 rows are moved by 1/2 Lo value based on an arbitrary N rows. A method of arranging coolant jet nozzles in continuous casting, which moves in the width direction and is relocated.
Relationship 1

(Where L is the interval between the spray nozzles, k1 is a negative constant determined through experiments on the measurement of the number distribution of the injection nozzles installed in the continuous casting process, and k2 is a measurement of the number distribution of the spray nozzles installed in the continuous casting process) Positive constant determined by experiment)
Relation 2

delete The method according to claim 1,
In the second step,
When the non-numerical overlap (Lo) value satisfies Equation 3 below, in the secondary cooling zone composed of the plurality of rows, the nozzles of the N + 1 rows by 1/2 Lo value are set by the value of any N rows. A method of arranging a coolant spray nozzle during continuous casting, in which the nozzle is moved in the width direction and repositioned, and the nozzles in the N + 2 rows are moved and relocated in the width direction of the cast steel by 1 / 2Lo based on the N + 1 rows.
Relationship 3

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