KR20150076911A

KR20150076911A - Continous casting apparatus

Info

Publication number: KR20150076911A
Application number: KR1020130165622A
Authority: KR
Inventors: 박영민; 기웅간; 지형빈; 황호근
Original assignee: 현대제철 주식회사
Priority date: 2013-12-27
Filing date: 2013-12-27
Publication date: 2015-07-07

Abstract

According to the present invention, there is provided a tundish comprising: a tundish in which molten steel for Ca-added steel is introduced and received from a ladle; and a coating layer covering the inside of the tundish for protecting the inside of the tundish from the molten steel containing Ca, Characterized in that the first casting layer comprises at least 95 wt% magnesium oxide.

Description

{Continuous Casting Apparatus}

The present invention relates to a continuous casting apparatus.

A tundish refers to a device that temporarily receives molten steel supplied from a ladle in a continuous casting process and injects it into a mold through an immersion nozzle. The molten steel having undergone the steelmaking and refining process is carried to the tundish on the continuous casting machine using ladders and then injected into the tundish through the ladle's nozzles. The tundish supplied with molten steel from the ladle injects the molten steel into the mold through the immersion nozzle, and after the molten steel injection operation is completed, the tundish is transported to the maintenance site for the next operation.

As a related art, Korean Patent Laid-Open Publication No. 2009-0053248 (published on May 25, 2009), a tundish coating agent and a tundish coating method using the same are available.

According to an embodiment of the present invention, a coating layer of a high-purity magnesium oxide material is formed in a tundish to prevent the contamination of Ca-added steel due to refractory erosion constituting the coating layer when the Ca- Device.

According to an embodiment of the present invention, there is provided a tundish including a tundish in which molten steel for Ca-added steel is introduced and received from a ladle, a coating layer covering the tundish interior to protect the tundish from the Ca- And the coating layer comprises a first coating layer formed of at least 95 wt% magnesium oxide.

In addition, the present invention may further include a second coating layer formed of a magnesium oxide-based refractory material below the first coating layer.

And the second coating layer is formed to contain not more than 80 wt% magnesium oxide.

The second coating layer may be formed to a thickness of 10-20 mm.

In addition, the present invention may further include an interior material layer under the second coating layer.

According to the embodiments of the present invention, when a high-purity magnesium oxide coating layer is formed inside a tundish using a continuous casting apparatus, the Ca-added steel molten steel due to refractory erosion constituting the coating layer Can be prevented.

Fig. 1 is a schematic view of melting corrosion caused by CaO in molten steel of a refractory.
2 illustrates a continuous casting apparatus according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment of a continuous casting apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, A description thereof will be omitted.

FIG. 1 is a schematic view of the melting erosion due to CaO in molten steel of a refractory, and FIG. 2 is a view showing a continuous casting apparatus according to an embodiment of the present invention.

As shown in FIG. 1, when the molten steel M for Ca addition is brought into contact with the refractory C in which magnesium oxide (MgO), aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ) (Al ₂ O ₃ ) and silicon dioxide (SiO ₂ ) function as a binder, calcium oxide (CaO) in the Ca-added steel molten steel M reacts with magnesium oxide to form a liquid compound. The liquid compound thus formed may be eroded and removed from the refractory (C) and interposed within the Ca-added steel melt (M).

The tundish 100 is a place where Ca-added steel molten steel M is introduced and accommodated from a ladle. A coating layer 200 formed of a refractory C for protecting the tundish 100 from Ca-added molten steel M may be formed in the tundish 100. At this time, the coating layer 200 should protect the inside of the tundish 100 from the Ca-added steel molten steel (M) and prevent the inclusion from flowing into the Ca-added steel molten steel (M) from the coating layer (200).

If the inclusion in the molten steel (M) for Ca-added steel is interposed and the Ca-added steel molten steel (M) is contaminated, it may deteriorate the quality and cause defects in the Ca-added steel.

Accordingly, in the continuous casting apparatus according to an embodiment of the present invention, when the coating layer 200 of the refractory (C) is formed in the tundish 100 for transferring the molten steel from the ladle to the mold for continuous casting, The magnesium oxide coating layer 200 is formed to prevent the above-described problems.

That is, even if the coating layer 200 in the tundish 100 is formed of the magnesium oxide-based refractory (C), aluminum oxide (Al ₂ O ₃ ) and silicon dioxide (SiO ₂ ) The refractory C may be eroded or eliminated by reacting with calcium oxide CaO of the molten steel M for molten steel in the case of a large amount of mixed refractory C so that the coating layer 200 inside the tundish 100 (C) containing high-purity magnesium oxide.

At this time, the coating layer 200 may include a first coating layer 210 formed of at least 95% by weight of magnesium oxide. That is, by forming the first coating layer 210 as the refractory C containing magnesium oxide of high purity, it is possible to prevent the inclusions from flowing into the Ca-added steel melt M from the coating layer 200.

Further, the continuous casting apparatus according to the present invention may further include a second coating layer 220, as shown in FIG. The second coating layer 220 may be formed on the lower portion of the first coating layer 210 and may be formed of a magnesium oxide-based refractory (C). A thick refractory C is required in order to prevent damage of the tundish 100 by the molten steel M for adding Ca because the molten steel M for adding Ca maintains a very high temperature of 1500-1600 degrees . However, the above-described high-purity magnesium oxide may be inefficient because it takes too much to construct the entire refractory (C).

Accordingly, in the continuous casting apparatus according to the present invention, in order to ensure a certain thickness of the refractory (C), the coating layer (200) containing magnesium oxide of high purity is formed as the uppermost layer in the tundish (100) The second coating layer 220 may be formed of a refractory (C) at a lower portion of the magnesium coating layer 200 and at least 80% by weight of magnesium oxide.

As described above, the first coating layer 210 is formed of a coating layer 200 made of high-purity magnesium oxide refractory (C), and the second coating layer 220 formed below the first coating layer 210 has a proper amount of The coating layer 200 is formed of the refractory C containing magnesium oxide to effectively prevent the tundish 100 from being damaged and to prevent the contamination due to the inclusion of the inclusion of the molten steel M for adding Ca .

At this time, the thickness of the first coating layer 210 may be 10-20 mm. The first coating layer 210 formed of high purity magnesium oxide may be formed to have a thickness or more to suppress the reaction between the refractory C and the Ca-added molten steel M by 10-20 mm.

Also, the thickness of the second coating layer 220 may be 10-20 mm. The thickness of the second coating layer 220 can be minimized by forming the minimum thickness required for the refractory C together with the first coating layer 210 to prevent damage to the tundish 100 from the Ca- have.

As shown in FIG. 2, the continuous casting apparatus according to the present invention may further include a layer of an interior material 300 under the second coating layer 220. The molten steel M for Ca addition contained in the tundish 100 is transferred to the mold for continuous casting and then the coating layer 200 covering the inside of the tundish 100 is desorbed and removed. At this time, the inner layer 300 may be further interposed between the tundish 100 and the coating layer 200 to facilitate the desorption of the coating layer 200 from the tundish 100 in order to desorb the coating layer 200.

The continuous casting apparatus according to the present invention includes a coating layer 200 covering the inside of the tundish 100 to protect the tundish 100 from the molten steel M with high temperature Ca added thereto as a refractory containing high purity magnesium oxide It is possible to protect the tundish and to prevent contamination of the molten steel (M) for Ca-added steel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

C: Refractory
M: Molten steel for Ca addition steel
100: Tundish
200: Coating layer
210: first coating layer
220: Second coating layer
300: interior material layer

Claims

A tundish in which Ca-added steel molten steel flows from a ladle and is received therein;
And a coating layer covering the inside of the tundish to protect the inside of the tundish from the molten steel containing Ca,
Wherein the coating layer comprises a first coating layer formed of at least 95 wt% magnesium oxide.

The method according to claim 1,
And a second coating layer formed of a magnesium oxide-based refractory material below the first coating layer.

3. The method of claim 2,
And the second coating layer is formed to contain not more than 80 wt% magnesium oxide.

3. The method of claim 2,
Wherein the first coating layer is formed to have a thickness of 10-20 mm.

5. The method of claim 4,
Wherein the second coating layer is formed to have a thickness of 10 to 20 mm.

3. The method of claim 2,
Further comprising an interior material layer below the second coating layer.