KR20170090281A - Cover for preheating of submerged nozzle and preheating method of submerged nozzle using the same - Google Patents

Cover for preheating of submerged nozzle and preheating method of submerged nozzle using the same Download PDF

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Publication number
KR20170090281A
KR20170090281A KR1020160010934A KR20160010934A KR20170090281A KR 20170090281 A KR20170090281 A KR 20170090281A KR 1020160010934 A KR1020160010934 A KR 1020160010934A KR 20160010934 A KR20160010934 A KR 20160010934A KR 20170090281 A KR20170090281 A KR 20170090281A
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KR
South Korea
Prior art keywords
nozzle
immersion nozzle
cover member
preheating
immersion
Prior art date
Application number
KR1020160010934A
Other languages
Korean (ko)
Inventor
심광용
Original Assignee
주식회사 세라코
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 주식회사 세라코 filed Critical 주식회사 세라코
Priority to KR1020160010934A priority Critical patent/KR20170090281A/en
Publication of KR20170090281A publication Critical patent/KR20170090281A/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
    • B22D11/10—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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • 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
    • 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
    • B22D41/60—Pouring-nozzles with heating or cooling means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

The present invention relates to a cover for preheating an immersion nozzle and a method for preheating the immersion nozzle using the same, wherein the immersion nozzle installed in the tundish, which is a continuous casting facility, comprises a first nozzle cover member detachably coupled with the first nozzle cover member, The tundish and the immersion nozzle are preheated, the tundish heated to the target temperature and the immersion nozzle are moved to the continuous casting line to install the tundish, and then the immersion nozzle is moved from the immersion nozzle to the first nozzle cover member and the second nozzle cover By separating and removing the members, there is no need to preheat the immersion nozzle to an excessive temperature, thus saving the energy consumed in the preheating operation and reducing the cost of preheating the tundish and the immersion nozzle.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for preheating an immersion nozzle and a method for preheating the immersion nozzle using the same,

The present invention relates to a cover for preheating an immersion nozzle and a method for preheating the immersion nozzle using the same, and more particularly, to a method for preventing the temperature from being lowered again during the preheating process of the immersion nozzle installed at the lower part of the tundish, The present invention relates to a cover for preheating an immersion nozzle and a method for preheating the immersion nozzle using the same.

Generally, in a continuous casting machine, molten steel is injected through a ladle and a tundish into a mold installed in a lower portion of the tundish, and the cast material molded in the mold is discharged to the lower portion of the mold and transferred to a plurality of pinch rolls, .

That is, the molten steel stored in the ladle is injected into the tundish via the shroud nozzle, molten steel injected into the tundish is injected into the mold through the immersion nozzle, and is firstly cooled and formed into a slab, Is fed through the pinch roll, cooled secondarily through the cooling water, and continuously cast.

The tundish and the immersion nozzle used in the continuous casting apparatus are prevented from being damaged due to thermal shock at the initial stage of the continuous casting operation immediately after being installed in the continuous casting line and the molten steel supplied at the beginning of the continuous casting operation is cooled It is preheated to about 1000 to 1200 ° C and then installed in a continuous casting line.

That is, the preheating operation of the tundish is performed by preheating the tundish and the immersion nozzle in a separate tundish preheating operation site for the tundish preheating operation, and then moving the tundish to the continuous casting line.

FIG. 1 is a perspective view illustrating a conventional immersion nozzle preheater. In the conventional immersion nozzle preheater 100, a cylindrical body 120 of a metal material is provided on a base plate 110 having wheels, And a refractory body 130 in which a nozzle inserting portion 131 for inserting an immersion nozzle at a center is formed.

The preheating operation of the immersion nozzle is performed together with the preheating operation of the tundish with the immersion nozzle installed in the tundish into the immersion nozzle preheater 100 having the inner circumferential surface formed of the refractory body 130.

However, the conventional immersion nozzle preheater has a structure in which it can not be transported while being mounted on a tundish, and the tundish nozzle is separated from the immersion nozzle only by the operation of raising and lowering the tundish. After the preheating, There is a problem that the temperature preheated during the movement is lowered since the preheated tundish is separated and moved in the immersion nozzle preheater when the preheated tundish is lifted and lowered.

As described above, since the preheating temperature is lowered during the movement of the immersion nozzle after the preheating operation, the immersion nozzle needs to be preheated at a temperature lower than the proper preheating temperature, that is, 1500 ° C or more during the movement, There is a problem that a lot occurs.

In addition, since the immersion nozzle heats the immersion nozzle at a high temperature of 1500 ° C or more during the preheating operation, the refractory body 130 of the immersion nozzle preheater is damaged during repeated preheating operations, so that the lifetime of the immersion nozzle is periodically short, there was.

The conventional immersion nozzle preheater 100 includes a wheeled base plate 110, a metal cylinder body 120, and a refractory body 130 inside the cylindrical body 120, , There is a problem that the maintenance cost is high.

Korean Patent Laid-Open No. 2005-0114398 'Preheating device for tundish deposition nozzle' (disclosed on December 12, 2005)

An object of the present invention is to provide a cover for preheating an immersion nozzle, which can improve the convenience of the immersion nozzle preheating operation and energy utilization efficiency, and can reduce the cost required for preheating the immersion nozzle, and a method for preheating the immersion nozzle using the same.

According to an aspect of the present invention, there is provided a cover for preheating an immersion nozzle, the cover for preheating an immersion nozzle for surrounding an outer surface of the immersion nozzle for preheating operation of the immersion nozzle installed in a tundish, A first nozzle cover member which encloses a part of the lower surface of the immersion nozzle and a part of the outer surface of the immersion nozzle, and a second nozzle cover member which is combined with the first nozzle cover member to connect the remaining part of the lower surface of the immersion nozzle, And a second nozzle cover member surrounding the rest of the outer surface.

In the present invention, the inner surface of the first nozzle cover member and the inner surface of the second nozzle cover member may be formed to correspond to the outer surface of the immersion nozzle while the immersion nozzle is wrapped, .

The first nozzle cover member and the second nozzle cover member may be provided with a pair of lubrication ports opposed to each other on a lower side outer side surface of the immersion nozzle, The first and second luer aperture holes may be respectively formed.

In the present invention, the first and second luer port exposing holes and the second luer port exposing holes may be formed in a position and size to expose all of the luer ports of the immersion nozzle.

The cover for preheating the immersion nozzle according to an embodiment of the present invention may further include a nozzle opening and closing stopper inserted into the side of the side of the immersion nozzle and blocking the opening.

In the present invention, the first nozzle cover member and the second nozzle cover member may be made of a ceramic fiber.

The cover for preheating the immersion nozzle according to an embodiment of the present invention may further include a cover coupling member for coupling and fixing the first nozzle cover member and the second nozzle cover member.

In the present invention, the cover engaging member may be a fixing wire that surrounds the outer surface of the first nozzle cover member and the second nozzle cover member.

According to an aspect of the present invention, there is provided an immersion nozzle preheating method including: an immersion nozzle mounting step of mounting an immersion nozzle in a tundish separated from a continuous casting line;

A first nozzle cover member for enclosing a part of the lower surface of the immersion nozzle and a part of the outer surface of the immersion nozzle, and a second nozzle cover member for engaging with the first nozzle cover member so that the remaining part of the lower surface of the immersion nozzle, And a second nozzle cover member surrounding the remainder of the first nozzle cover member to the immersion nozzle;

A preheating step of heating the tundish and the immersion nozzle together to a target temperature;

A tundish installing step of moving the tundish heated to a target temperature and the immersion nozzle to a continuous casting line to install the tundish; And

And separating and removing the first nozzle cover member and the second nozzle cover member from the immersion nozzle after the tundish installing step.

In the present invention, the preheating step may heat the immersion nozzle to 1100 ° C to 1300 ° C.

The present invention can be easily mounted on an immersion nozzle installed in a tundish and can preheat the immersion nozzle immediately after it is mounted. After the tundish has been installed on the continuous casting line after the preheating, There is an effect that the temperature during the movement of the nozzle is prevented from being lowered.

The present invention eliminates the need for preheating the immersion nozzle to an excessive temperature, thereby saving energy consumed in the preheating operation and allowing stable use without damaging for a long time, thereby reducing the cost of preheating the immersion nozzle.

1 is a perspective view showing a conventional tundish preheater.
FIG. 2 is a bottom perspective view showing an example of use of an embodiment of a cover for preheating an immersion nozzle according to the present invention. FIG.
3 is an exploded perspective view showing an embodiment of a cover for preheating an immersion nozzle according to the present invention.
4 is a sectional view showing an example of use of a cover for preheating an immersion nozzle according to the present invention.
5 is a process diagram showing a preheating method of an immersion nozzle according to the present invention.
6 is a view illustrating an example in which the cover for preheating the immersion nozzle according to the present invention is separated and removed in a state where the tundish is installed in the continuous casting line facility.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

FIG. 2 is a bottom perspective view illustrating an embodiment of a cover for preheating an immersion nozzle according to the present invention, FIG. 3 is an exploded perspective view illustrating an embodiment of a cover for preheating an immersion nozzle according to the present invention, 4 is a cross-sectional view showing an example of use of the cover for preheating the immersion nozzle according to the present invention.

2 to 4, an embodiment of the cover for preheating the immersion nozzle according to the present invention will be described in detail.

An immersion nozzle (2) is installed on the lower surface of the tundish (1), which is a continuous casting facility, in a protruding manner.

The tundish 1 is installed in a continuous casting line, receives and stores molten steel introduced from the reed, and the immersion nozzle 2 is installed in the tundish louver.

The immersion nozzle 2 is installed in the tundish opening of the tundish 1, and a part of the lower end of the immersion nozzle 2 is immersed in the molten steel in the mold for continuous casting, and the molten steel is introduced into the mold for continuous casting.

The immersion nozzle (2) is provided with a pair of openings (2a) facing each other on the lower side outer side surface.

The immersion nozzle (2) is provided with a pair of openings (2a) facing each other, and the molten steel is introduced into the mold in opposite directions in opposite directions.

The tundish 1 and the immersion nozzle 2 prevent breakage due to thermal shock at the beginning of a continuous casting operation immediately after being installed in a continuous casting line and prevent molten steel supplied at the beginning of a continuous casting operation from being cooled and solidified The cover for preheating the immersion nozzle according to the present invention is used for preheating the tundish 1 and the immersion nozzle 2. More specifically, 2).

The cover for preheating the immersion nozzle according to the present invention is formed so as to surround the outer surface of the immersion nozzle 2 for the preheating operation of the immersion nozzle 2.

The cover for preheating the immersion nozzle according to the present invention includes a first nozzle cover member 10 surrounding a part of the lower surface of the immersion nozzle 2 and a part of the outer surface of the immersion nozzle 2; And a second nozzle cover member (20) coupled with the first nozzle cover member (10) and surrounding the rest of the lower surface of the immersion nozzle (2) and the rest of the outer surface of the immersion nozzle do.

The first nozzle cover member 10 and the second nozzle cover member 20 are coupled to each other with the immersion nozzle 2 interposed therebetween so as to surround the immersion nozzle 2.

The first nozzle cover member 10 includes a first bottom surface 11 covering a part of the lower surface of the immersion nozzle 2, a first bottom surface 11 formed on the first bottom surface 11, And a first side portion 12 surrounding a portion of the outer surface of the immersion nozzle 2.

The second nozzle cover member 20 includes a second bottom surface portion 21 covering the remaining portion of the bottom surface of the immersion nozzle 2 which is covered by the first bottom surface portion 11, And a second side portion 22 which is erected at the lower surface portion 21 and has an open top shape and covers the remaining portion of the outer side surface of the immersion nozzle 2 covered by the first side surface portion 12 .

The inner surface of the first nozzle cover member 10 and the inner surface of the second nozzle cover member 20 are formed to correspond to the outer surface of the immersion nozzle 2 while the immersion nozzle 2 is wrapped, As shown in Fig.

The shape of the first nozzle cover member 10 and the shape of the second nozzle cover member 20 can be variously modified depending on the shape of the immersion nozzle 2. [

The first nozzle cover member 10 and the second nozzle cover member 20 are preferably made of a ceramic fiber and can be formed by mixing a ceramic fiber, Followed by drying and firing.

The first nozzle cover member 10 and the second nozzle cover member 20 are made of a ceramic fiber, and are excellent in heat resistance, light in weight, and excellent in moldability, thereby being easy to manufacture.

The first nozzle cover member 10 and the second nozzle cover member 20 of ceramic fiber material can be used many times by securing the durability in the preheating operation of the high-temperature immersion nozzle, And it is easy to install and disassemble the immersion nozzle 2.

The cover for preheating immersion nozzle according to the present invention further includes a cover joining member 30 for fixing the first nozzle cover member 10 and the second nozzle cover member 20 by fixing them.

The cover member 30 is configured to keep the first nozzle cover member 10 and the second nozzle cover member 20 engaged with each other so that the first nozzle cover member 10 and the second nozzle cover member 20, And a fixing wire 31 surrounding the outer surface of the nozzle cover member 20 as an example.

The fixing wire 31 is formed of a metal material which is not damaged by the high temperature generated in the preheating operation of the immersion nozzle 2, and the first nozzle cover member 10 and the second nozzle cover member 20, The inner surface of the first nozzle cover member 10 and the inner surface of the second nozzle cover member 20 are held in close contact with the outer surface of the immersion nozzle 2 so as to surround the outer surface of the immersion nozzle 20 do.

Although not shown, the cover engaging member 30 includes a male coupling protruding from either the first nozzle cover member 10 or the second nozzle cover member 20, the first nozzle cover member 10, The first nozzle cover member 10 and the second nozzle cover member 20 may be provided on the other side of the second nozzle cover member 20 and may be an arm coupling member to which the male coupling member is coupled. The first nozzle cover member 10 and the second nozzle cover member 12 may be made of a material that is not damaged by the high temperature generated in the preheating operation of the immersion nozzle 2, 20 may remain in engagement with each other.

The cover for preheating the immersion nozzle according to the present invention further includes a nozzle lug opening stopper 40 inserted into the side of the lug opening 2a of the immersion nozzle 2 to block the lug opening 2a .

The nozzle lug opening stopper member 40 blocks the lug opening 2a during the preheating operation of the dipping nozzle 2 to increase the efficiency of the preheating operation. That is, it is possible to prevent flames or heat flowing into the immersion nozzle 2 from flowing out to the outside through the louver 2a, thereby minimizing energy consumption in the preheating operation of the immersion nozzle 2, .

The nozzle lid opening stopper member 40 is formed of a ceramic material, more specifically, a ceramic fiber material.

The first nozzle cover member 10 and the second nozzle cover member 20 are provided with a first luer port exposing hole 13 and a second luer port cover 13 corresponding to both luer lugs 2a of the dipping nozzle 2, And an exposure hole 23 are respectively formed.

The first and second luer port exposing apertures 13 and 23 are formed in positions and sizes to expose all of the luer apertures 2a of the dipping nozzle 2, And is formed to have a size larger than that of the lug opening 2a.

The first and second luer port exposing apertures 13 and 23 are formed at the bottom of the first side surface portion 12 and the second side surface portion 22 in the luer port of the dipping nozzle 2 So that it is possible to facilitate the engagement and disassembly of the nozzle lug opening 40 by exposing the lug opening 2a.

FIG. 5 is a process diagram illustrating a method for preheating an immersion nozzle according to the present invention, and the method for preheating an immersion nozzle according to the present invention preheats an immersion nozzle using the cover for preheating the immersion nozzle according to the present invention.

Referring to FIG. 5, the immersion nozzle preheating method according to the present invention includes: an immersion nozzle mounting step (S100) in which an immersion nozzle (2) is installed in a tundish (1) separated from a continuous casting line;

A first nozzle cover member 10 surrounding a part of the lower surface of the immersion nozzle 2 and a part of the outer surface of the immersion nozzle 2 and a second nozzle cover member 10 joined to the immersion nozzle 2, 2) and a second nozzle cover member (20) for covering the remaining part of the outer surface of the immersion nozzle (2) are provided on the immersion nozzle (2) Installation step S200;

A preheating step (S300) of heating the tundish (1) and the immersion nozzle (2) together to a target temperature;

A tundish installing step (S400) of moving the tundish (1) and the immersion nozzle (2) heated to a target temperature to a continuous casting line to install the tundish (1); And

And a cover separating step (S500) for separating and removing the first nozzle cover member (10) and the second nozzle cover member (20) from the immersion nozzle (2) after the installation of the tundish (1).

FIG. 6 is a view illustrating an example in which the cover for preheating the immersion nozzle according to the present invention is separated and removed in a state where the tundish 1 is installed in the continuous casting line facility. Referring to FIG. 6, The cover for the tent can be separated into the first nozzle cover member 10 and the second nozzle cover member 20 in the outer lateral direction of the immersion nozzle 2, that is, in the horizontal direction, Line equipment and can be easily removed and removed immediately before the continuous casting operation.

The cover for preheating the immersion nozzle is made of ceramic fiber and is light in weight. Thus, in the cover installing step and the cover removing step (S500), an operator can easily install the immersion nozzle on the immersion nozzle 2 or separate it from the immersion nozzle 2 And the tundish 1 can be moved without problems when it is installed in the immersion nozzle 2 when the tundish 1 is moved to the continuous casting line after the preheating step S300.

The immersion nozzle preheating method according to the present invention is characterized in that the tundish 1 and the immersion nozzle 2 preheated in a state where the immersion nozzle preheating cover is installed in the immersion nozzle 2 are installed in a continuous casting line facility It is sufficient to heat the immersion nozzle 2 only at 1100 ° C to 1300 ° C in the preheating step S300 and it is not necessary to heat the immersion nozzle 2 to a high temperature of 1500 ° C or more.

In the preheating step S300, it is not necessary to heat the immersion nozzle 2 to a high temperature of 1500 ° C or more, and heating only at 1200 ° C to 1300 ° C is sufficient. Therefore, in the preheating step S300, And the cover for preheating the immersion nozzle can be used more repeatedly.

The present invention can be easily mounted on the immersion nozzle 2 installed in the tundish 1 and can preheat the immersion nozzle 2 immediately after it is mounted and after the tundish 1 is installed in the continuous casting line There is an effect of preventing the temperature of the immersion nozzle 2 from being lowered while the immersion nozzle 2 is being moved.

The present invention eliminates the need to preheat the immersion nozzle (2) to an excessive temperature, thereby saving the energy consumed in the preheating operation, and can be used stably without damage for a long time, thereby reducing the cost of the preheating operation of the immersion nozzle.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the above teachings. will be.

1: Tundish 2: Immersion nozzle
2a: lubrication port 10: first nozzle cover member
11: first lower surface portion 12: first side surface portion
13: first ladder opening hole 20: second nozzle cover member
21: second bottom surface portion 22: second side surface portion
23: second port aperture 30: cover engagement member
31: Fixed wire 40: Nozzle threading stopper member

Claims (10)

A cover for preheating an immersion nozzle for enclosing an outer surface of the immersion nozzle for preheating operation of an immersion nozzle installed in a tundish, which is a continuous casting facility, and a cover for covering a part of the lower surface of the immersion nozzle and a part of the outer surface of the immersion nozzle A first nozzle cover member; And
And a second nozzle cover member coupled to the first nozzle cover member to surround the remaining portion of the lower surface of the immersion nozzle and the rest of the outer surface of the immersion nozzle. The method according to claim 1,
The inner surface of the first nozzle cover member and the inner surface of the second nozzle cover member are formed to correspond to the outer surface of the immersion nozzle while being in contact with the outer surface of the immersion nozzle A cover for preheating the immersion nozzle. The method according to claim 1,
The immersion nozzle is provided with a pair of lips opposed to each other on a lower side outer side,
Wherein the first nozzle cover member and the second nozzle cover member are formed with a first luer port exposing hole and a second luer port exposing hole corresponding to both luer openings of the immersion nozzle, . The method of claim 3,
Wherein the first and second luer port exposing holes and the second luer port exposing holes are formed in positions and sizes to expose all of the luer ports of the dipping nozzle. The method of claim 3,
Further comprising a nozzle opening and closing stopper inserted into both of the opening and closing ports of the immersion nozzle to block the opening and closing port. The method according to claim 1,
Wherein the first nozzle cover member and the second nozzle cover member are made of a ceramic fiber. The method according to claim 1,
Further comprising a cover engaging member for engaging and fixing the first nozzle cover member and the second nozzle cover member. The method of claim 7,
Wherein the cover engaging member is a fixing wire that surrounds the outer surface of the first nozzle cover member and the outer surface of the second nozzle cover member. An immersion nozzle mounting step of installing an immersion nozzle in a tundish separated from the continuous casting line;
A first nozzle cover member for enclosing a part of the lower surface of the immersion nozzle and a part of the outer surface of the immersion nozzle, and a second nozzle cover member for engaging with the first nozzle cover member so that the remaining part of the lower surface of the immersion nozzle, And a second nozzle cover member surrounding the remainder of the first nozzle cover member to the immersion nozzle;
A preheating step of heating the tundish and the immersion nozzle together to a target temperature;
A tundish installing step of moving the tundish heated to a target temperature and the immersion nozzle to a continuous casting line to install the tundish; And
And a cover separating step of separating and removing the first nozzle cover member and the second nozzle cover member from the immersion nozzle after the tundish installing step. The method of claim 9,
Wherein the preheating step heats the immersion nozzle to a temperature of 1100 ° C to 1300 ° C.
KR1020160010934A 2016-01-28 2016-01-28 Cover for preheating of submerged nozzle and preheating method of submerged nozzle using the same KR20170090281A (en)

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KR1020160010934A KR20170090281A (en) 2016-01-28 2016-01-28 Cover for preheating of submerged nozzle and preheating method of submerged nozzle using the same

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Application Number Priority Date Filing Date Title
KR1020160010934A KR20170090281A (en) 2016-01-28 2016-01-28 Cover for preheating of submerged nozzle and preheating method of submerged nozzle using the same

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KR20170090281A true KR20170090281A (en) 2017-08-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114523097A (en) * 2022-01-13 2022-05-24 北京科技大学 Long nozzle coating temperature regulation system and method in continuous casting production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114523097A (en) * 2022-01-13 2022-05-24 北京科技大学 Long nozzle coating temperature regulation system and method in continuous casting production

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