KR101243019B1 - Nozzle Apparatus for Molten Steel - Google Patents
Nozzle Apparatus for Molten Steel Download PDFInfo
- Publication number
- KR101243019B1 KR101243019B1 KR1020100114088A KR20100114088A KR101243019B1 KR 101243019 B1 KR101243019 B1 KR 101243019B1 KR 1020100114088 A KR1020100114088 A KR 1020100114088A KR 20100114088 A KR20100114088 A KR 20100114088A KR 101243019 B1 KR101243019 B1 KR 101243019B1
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- South Korea
- Prior art keywords
- nozzle
- molten steel
- plate
- heating element
- roll
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Abstract
Provided is a molten steel nozzle device for supplying molten steel to a rolling or casting facility.
The molten steel nozzle apparatus may include: first and second nozzle parts provided to discharge molten steel while being connected to a molten steel supply target facility; And a heating element that is assembled while the microwave is applied to the second nozzle unit, wherein the molten steel supply target facility is provided as a rolling roll or a casting roll, and the first nozzle unit faces a pair of roll stands. And a second nozzle plate provided to form a molten steel discharge port and an inlet port therebetween and interposed between the main nozzle plates on both sides of the main nozzle plate, and having the heating element assembled therebetween. It may be configured as an example.
According to the present invention, the heating control of the nozzle is implemented through microwaves to prevent the (local) supercooling of the molten steel during the initial injection of the molten steel, in particular, the magnesium molten steel, and thereby to produce the supercooling of the molten steel. Blocks nozzle clogging caused by inclusions and prevents the difference of the structure due to the difference in molten steel temperature at the center portion and the edge portion inside the nozzle, ultimately improving the product quality of the rolled or cast plate. Can be.
Description
The present invention relates to a molten steel nozzle apparatus that enables molten steel to be supplied to a rolling or casting facility, and more particularly, to prevent nozzle clogging caused by inclusions generated by supercooling of molten steel during initial injection of molten steel, The present invention relates to a molten steel nozzle apparatus that can simplify the structure by preventing the difference between the molten steel temperature at the center and the edge portion, and improve the product quality.
Magnesium products (plates, steel sheets) offer the smallest specific gravity of practical metals, high specific strength, excellent castability, machinability, dimensional stability and durability.
Therefore, related products (alloys) using magnesium have been widely used not only in automobile parts, communication parts, electronic parts, computers, portable electronic devices, but also as sports materials.
On the other hand, such magnesium products are processed and produced by die-casting, ingot casting, chill casting or strip casting.
For example, although not shown in a separate drawing, strip casting of a magnesium product is produced by supplying magnesium molten steel to a casting roll (or rolling roll) to produce a sheet metal or steel sheet, in order to supply magnesium molten steel to such a casting roll. Uses a molten steel supply nozzle associated with a pair of casting roll inlets.
By the way, since most molten steel nozzles have been arrange | positioned at normal temperature to one side of a casting roll, when molten steel, for example, about 700 degreeC magnesium molten steel is supplied to a nozzle for the first time, the part which contacts a nozzle inside a nozzle ( In the edge portion of the nozzle), a supercooling phenomenon occurs in which the temperature of the molten steel decreases.
As a result, a temperature difference of molten steel is generated between the center portion and the edge portion inside the nozzle, and this temperature difference causes the structure of the magnesium product to be cast (rolled) to be different from each other, resulting in deterioration of the quality of the product.
In addition, even if the nozzle is heated up in advance, the nozzle is naturally cooled during the installation time in the equipment (roll stand), thereby eliminating the problem of (local) supercooling that occurs when the nozzle first contacts the molten steel supplied to the nozzle described above. It was difficult.
Accordingly, the Applicant of the present invention supplies magnesium molten steel to a rolling roll (casting roll), and at least a nozzle temperature is realized by applying a microwave at a desired time online, thereby at least a nozzle. In the initial inflow of molten steel, the present invention has been proposed to eliminate the temperature difference caused by supercooling of the molten steel and to block the clogging of nozzles with inclusions, thereby simplifying the structure due to the low structural change.
The present invention has been proposed in order to solve the conventional problems as described above, the object of the present invention is to prevent the clogging of the nozzle by blocking the formation of the inclusion by the (local) supercooling of the molten steel when the molten steel is first injected into the nozzle, It is to provide a molten steel nozzle device that can simplify the structure despite the heating implementation because the product quality is improved by removing the difference between the molten steel temperature in the center portion and the edge portion inside the nozzle and using microwaves.
As a technical aspect for achieving the above object, the present invention, the first and second nozzle unit provided to discharge the molten steel while being connected to the molten steel supply target equipment; And
A heating element which is assembled while the microwave is applied to the second nozzle unit;
, ≪ / RTI >
The molten steel supply target equipment is provided in a rolling roll or a casting roll,
The first nozzle unit includes a main nozzle plate disposed to face each other on a roll stand, and the second nozzle unit is provided to form a molten steel discharge port and an inlet port inside the assembly while interposed between the main nozzle plates on both sides. Provided is a molten steel nozzle apparatus including an auxiliary nozzle plate to which the heating element is assembled.
Preferably, the heating element may be composed of a heating plate that is self-heated upon application of the micro plate while being assembled and fitted in each of the openings processed in the auxiliary nozzle plate of the second nozzle unit.
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More preferably, the main nozzle plates are fixed to the roll stand by means of a connecting member, and a magnetron connected to generate microwaves on the roll stand or a waveguide connected to the magnetron is disposed adjacent to the nozzle portion. Can be.
In this case, the nozzle plates constituting the first and second nozzle parts may be formed of ceramic, and the heating element may be provided as silicon carbide which is self-heated when microwave is applied.
Preferably, the apparatus further includes molten steel contact area increasing means provided on the molten steel contact surface of the auxiliary nozzle plate of the second nozzle unit, wherein the molten steel contact area increasing means includes one or more longitudinally provided along the molten steel contact surface of the nozzle plate. It consists of curved surfaces.
According to the molten steel nozzle apparatus of the present invention as described above, since the heating control of the nozzle is implemented through microwaves, the overall structure of the nozzle apparatus is less changed.
For example, since the heat generating plate made of silicon carbide is assembled into an opening formed in the nozzle plate, the heat generating plate can be recycled during maintenance of the nozzle, thereby providing an economical advantage.
In addition, according to the shape of the heating plate provided to be fitted to the nozzle plate, it is also possible to control the local temperature rise of the desired portion of the nozzle.
In particular, when the nozzle first flows into the molten steel, the molten steel temperature decreases at the nozzle contact surface (edge portion inside the nozzle) to prevent the (local) overcooling of the molten steel.
Accordingly, the present invention prevents nozzle clogging caused by inclusions caused by supercooling of molten steel, while preventing the non-uniform structure of the product due to the difference in molten steel temperature at the center portion and the edge portion inside the nozzle, and thus rolling or casting To improve the quality of the finished product.
In addition, according to the present invention, when the microwave is applied at a desired time point, the nozzle is heated (heated), so that real-time temperature control is possible without stopping or stopping operation.
1 is a schematic diagram showing a rolling process in which a molten steel nozzle apparatus according to the present invention is used,
2 is an exploded perspective view showing a nozzle apparatus according to the present invention;
3 is a plan view showing a molten steel discharge state through the nozzle apparatus according to the present invention,
4 is a perspective view showing an assembled state of the nozzle apparatus according to the present invention;
5 is a perspective view showing a modification of the auxiliary nozzle plate according to the present invention,
FIG. 6 is a planar configuration diagram showing a molten steel discharge state using the present invention auxiliary nozzle plate of FIG. 5.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
First, in FIG. 1, the use state of the molten
In addition, the molten
First, as shown in Figures 1, 2 and 4, the molten
Therefore, as will be described in detail below, in the molten
As described in detail below, the
Therefore, since the temperature of the nozzle can be increased, even if molten steel is supplied to the
That is, as will be described in detail below, a microwave wave is applied to the
On the other hand, Figure 1 shows the discharge of molten steel from the
That is, as shown in Figure 1, the substance to be introduced into the main body through the heating means 82 (heating coil (heating wire), induction heater, burner, etc.) provided in the
And, the molten
On the other hand, adjacent to the nozzle device of the present invention, a known
Accordingly, as the microwaves are applied to the nozzle device of the present invention, in particular, the
On the other hand, look at in more detail the present invention molten
That is, as shown in Figures 2 to 4, the molten
At this time, the
The
In this case, the
Such holes are preferably positioned so as to avoid the
The
Accordingly, as shown in FIGS. 3 and 4, the gap between the tip of the
Therefore, since the molten
On the other hand, the molten
As a result, the molten
Next, as shown in FIGS. 2 to 4, in the molten
As described above, the
Accordingly, the
At this time, the spaced distance between the
Of course, the molten
Next, in the molten
Therefore, as described above, when the microwave generated during the operation of the
Of course, the shape of the
At this time, the auxiliary nozzle plate may be formed of a ceramic material, so that the
And, although not preferably shown in a separate drawing, it is possible to prevent the flow by providing a fin structure to the
In addition, the
For example, when the microwave generated from the
Therefore, since the silicon carbide of the heating plate is an artificial mineral produced by covalent bonding, it can be molded (manufactured) into a desired shape according to the size and shape of the nozzle apparatus of the present invention, has a high hardness, and has high wear resistance and hardness. Is excellent.
That is, since it has high thermal conductivity and low thermal expansion rate, even if it is used as a heating element for a long time, there is little damage rate.
Therefore, even if microwave microwave is applied, the heating plates of silicon carbide are self-heated, and the radiant heat generated at this time is the upper and lower
That is, as shown in Fig. 3, since the heating plate flows while the molten steel is in contact with the
On the other hand, in the present embodiment, the temperature of the nozzle device in the case of molten steel, for example, magnesium molten steel to raise the temperature up to 700 ℃, even if the magnesium molten steel is introduced at least, so as to prevent the overcooling of the molten steel at least in contact with the nozzle It would be desirable to.
In this case, since the molten steel is not at least locally supercooled, generation of inclusions due to cooling is prevented, and thus clogging of the existing molten steel discharge port with the generated inclusions is prevented.
Of course, if molten steel is continuously supplied over time after the molten steel is first injected into the nozzle, the temperature of the nozzle parts will be raised even if microwaves are not applied to the
Therefore, although not separately shown in the drawing, a temperature sensor such as a thermocouple is provided through the main nozzle plate of the nozzle device, the temperature sensor and the device control unit are electrically connected to each other, and the device control unit is a movable portion (power supply unit) of the magnetron. In conjunction with, it will be possible to control the power of the microwave heating element by controlling the operation of the magnetron.
In other words, by measuring the temperature of the molten steel in the nozzle or the molten steel outlet in real time, and controlling the application or intensity of the microwave based on this, it will be possible to reduce the waste due to more appropriate prevention of molten steel and unnecessary use of the magnetron. .
For example, the actual test nozzle is placed in a sealed container, the microwave output of the
Therefore, the temperature inside the nozzle can be raised to about 500 ° C., and the edge portion ('A' in FIG. 3) inside the nozzle that is likely to cause molten steel supercooling is adjacent to the SiC heating plate. For example, it may be possible to raise the temperature to a temperature close to 700 ° C, which is a magnesium melting temperature.
Next, FIGS. 5 and 6 show another modified example of the molten
That is, the molten steel contact area increasing means may be provided as, for example, one or more
Preferably, such curved surfaces are continuously formed along the inner surface of the auxiliary nozzle plate, but the length of the curved surface is increased as it goes to the molten steel discharge port.
Therefore, as shown in FIG. 6, in the molten steel M, particularly in the edge portion (the portion in contact with the inner surface of the nozzle plate), the molten steel flows while the contact area of the inner surface of the nozzle plate is further increased while the molten steel flows. As the discharge port goes up, it is possible to further increase the temperature of the molten steel.
More preferably, in the actual operation line, the countermeasure for the worker according to the application of the microwave is preferable, although not shown in a separate drawing, the
Accordingly, the molten
While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.
1 .... Molten
12,14 ....
31 .... Heating element opening 32, 34 .... Auxiliary nozzle plate
40 ....
Claims (6)
A heating element 40 that is assembled while the microwave is applied to the second nozzle part;
, ≪ / RTI >
The molten steel supply target equipment is provided in a rolling roll or a casting roll,
The first nozzle unit 10 includes main nozzle plates 12 and 14 arranged to face a pair of roll stands 100, and the second nozzle unit 30 is interposed between the main nozzle plates. A molten steel nozzle device including an auxiliary nozzle plate (32) (34) provided to form a molten steel discharge port (16) and an inlet (18) therein while being assembled on both sides and assembled with the heating element.
The heating element 40 is inserted into the openings 31 processed in the auxiliary nozzle plates 32 and 34 of the second nozzle unit, respectively, and the molten steel nozzle, characterized in that composed of a heating plate that self-heats upon application of microwaves. Device.
The main nozzle plate is fixed to the roll stand 100 via the connecting member 6,
A molten steel nozzle apparatus, characterized in that a magnetron (2) connected to generate microwaves on a roll stand or a waveguide (4) connected to a magnetron are disposed adjacent to a nozzle portion.
The nozzle plates constituting the first and second nozzle parts are formed of ceramic,
The heating element (40) is a molten steel nozzle device, characterized in that formed of silicon carbide (SiC) that self-heats when microwave is applied.
It further comprises a molten steel contact area increasing means provided on the molten steel contact surface of the auxiliary nozzle plate of the second nozzle portion,
The molten steel contact area increasing means, characterized in that the molten steel nozzle device comprising one or more curved surfaces (50) provided in the longitudinal direction along the molten steel contact surface of the nozzle plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100114088A KR101243019B1 (en) | 2010-11-16 | 2010-11-16 | Nozzle Apparatus for Molten Steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100114088A KR101243019B1 (en) | 2010-11-16 | 2010-11-16 | Nozzle Apparatus for Molten Steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20120052781A KR20120052781A (en) | 2012-05-24 |
| KR101243019B1 true KR101243019B1 (en) | 2013-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020100114088A KR101243019B1 (en) | 2010-11-16 | 2010-11-16 | Nozzle Apparatus for Molten Steel |
Country Status (1)
| Country | Link |
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| KR (1) | KR101243019B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101506682B1 (en) * | 2012-12-28 | 2015-03-30 | 주식회사 포스코 | Horizontal continuous casting apparatus for clad sheet |
| GB2543517A (en) * | 2015-10-20 | 2017-04-26 | Pyrotek Eng Mat Ltd | Caster tip for a continuous casting process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR810001380B1 (en) * | 1978-08-24 | 1981-10-17 | 조세프 상라빌레 | Nozzle for feeding liquid metal to a continuous plate casting machine |
| JP2000254770A (en) * | 1999-03-09 | 2000-09-19 | Nippon Steel Corp | Method for drying and preheating lining refractory of vessel for molten metal |
| KR20100032209A (en) * | 2008-09-17 | 2010-03-25 | 안기현 | Horizontal continuous casting apparatus |
| KR20110082890A (en) * | 2010-01-12 | 2011-07-20 | 남종일 | Metallic nozzle with built-in heaters for manufacturing metal plate |
-
2010
- 2010-11-16 KR KR1020100114088A patent/KR101243019B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR810001380B1 (en) * | 1978-08-24 | 1981-10-17 | 조세프 상라빌레 | Nozzle for feeding liquid metal to a continuous plate casting machine |
| JP2000254770A (en) * | 1999-03-09 | 2000-09-19 | Nippon Steel Corp | Method for drying and preheating lining refractory of vessel for molten metal |
| KR20100032209A (en) * | 2008-09-17 | 2010-03-25 | 안기현 | Horizontal continuous casting apparatus |
| KR20110082890A (en) * | 2010-01-12 | 2011-07-20 | 남종일 | Metallic nozzle with built-in heaters for manufacturing metal plate |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20120052781A (en) | 2012-05-24 |
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