KR20150025883A

KR20150025883A - Turndish dam for guiding flow of molten iron

Info

Publication number: KR20150025883A
Application number: KR20130104017A
Authority: KR
Inventors: 배수열
Original assignee: 주식회사 포스코
Priority date: 2013-08-30
Filing date: 2013-08-30
Publication date: 2015-03-11

Abstract

The present invention is characterized in that it is installed vertically between a ladle injection nozzle for supplying molten steel from a ladle to a tundish and an immersion nozzle for injecting molten steel in a tundish into a mold, the lower end of which is spaced apart from the bottom of the tundish An auxiliary dam which is provided to extend from the bottom of the tundish to a predetermined height upward at a position closer to the immersion nozzle than the main dam and has a residual hole for guiding the residual molten steel to the immersion nozzle at a lower central portion thereof; And an inclusion float block installed between the main dam and the auxiliary dam and having a shape to float the inclusion from the molten steel flowing through the space between the main dam and the tundish bottom toward the auxiliary dam, Provide a dam.

Description

Technical Field [0001] The present invention relates to a tundish dam for guiding a molten steel flow,

The present invention relates to a continuous casting process for casting a metal, and more particularly, to a tundish dam capable of securing the flowability of molten steel so that inclusions can be easily separated from the molten steel in the tundish.

The continuous casting process in the steelmaking process refers to a process in which molten steel, that is, molten steel is continuously injected into a mold and coagulated to continuously cast an elongated cast steel.

1 and 2 show a continuous casting line for carrying out a general continuous casting process. Molten steel (M) contained in the ladle (100) is introduced into the tundish (1) through the injection nozzle (102). The molten steel injected into the tundish 1 is continuously injected into the continuous casting mold 110 disposed at the lower portion of the tundish 1 through the immersion nozzle 2 formed on both sides of the bottom of the tundish 1, (S), that is, the slab is continuously cast. 1 and 2 show an example in which one ladle 100 is provided on the center side of the tundish 1 and two molds 110 are provided on both lower sides of the tundish 1, There are cases where ladles 100 are provided on both sides of the upper portion of the tundish 1 and one mold 110 is provided on the lower central side of the tundish.

2, a dam is provided between the injection nozzle 102 and the immersion nozzle 2 in the tundish 1. This dam includes a main dam 30 installed at the upper side of the tundish 1 at a certain distance from the bottom of the tundish 1 and an auxiliary dam 40 installed at the bottom of the tundish 1. The main dam 30 is installed relatively close to the injection nozzle 102 and the auxiliary dam 40 is installed relatively close to the immersion nozzle 2. [ At the lower end of the center of the auxiliary dam (40), a residual hole (42) is formed. The remaining molten steel M can be injected into the mold 110 through the remnant hole 42 when the molten steel M in the tundish 1 remains lower than the height of the auxiliary dam 40 at the end of casting .

This dam generates upward flow toward the molten steel (M) injected into the tundish (1) through the injection nozzle (102) so that the inclusions contained in the molten steel (M) are separated from the molten steel . Accordingly, inclusions are injected into the mold 110 together with the molten steel M to prevent the quality of the slab S from deteriorating.

In the conventional dam having such a structure, the molten steel M is injected into the tundish 1 from the ladle 100, and the molten steel M is injected into the tundish 1 by the action of injecting the molten steel into the tundish 1. [ The inclusions are sufficiently separated from the molten steel M. However, during the connection of the ladle 100 to the tundish 1, or at the end of the casting, that is, during casting, the flowability of the molten steel M is insufficient, Is not separated from the molten steel (M). Accordingly, when the ladle 100 is connected or cast, the inclusion of the inclusion into the mold 110 together with the molten steel M can not prevent the slab S from being deteriorated in quality.

It is an object of the present invention, which is devised in view of the above circumstances, to provide a molten steel which is capable of minimizing the inclusion of molten steel through the molten steel even when the molten steel has insufficient flowability, The present invention provides a tundish dam for inducing molten steel flow.

In order to achieve the above object, the present invention provides a method of manufacturing a tundish, comprising the steps of: vertically installing a ladle injection nozzle for supplying molten steel from a ladle to a tundish and an immersion nozzle for injecting molten steel in a tundish into a mold, A main dam which is spaced apart from the bottom of the tundish at a predetermined distance from the bottom of the tundish; An inclined float block provided between the main dam and the auxiliary dam and configured to float the inclusion from the molten steel passing through the space between the main dam and the tundish bottom and flowing toward the auxiliary dam, The present invention provides a tundish dam for inducing molten steel flow.

Preferably, the inclusion float block may have an inclined surface inclined upward from the main dam side toward the auxiliary dam side on the upper surface thereof.

Preferably, the inclusion float block may be spaced apart from the remaining dam hole of the auxiliary dam to face the remaining dam hole.

Preferably, the inclusive float block may have a width equal to or greater than the width of the residual dam of the auxiliary dam, and the height thereof may be equal to or higher than the height of the residual dam of the auxiliary dam.

According to the tundish dam for guiding the flow of molten steel according to the present invention, the molten steel passing through the main dam and flowing toward the auxiliary dam is given the fluidity that the upward flow of the molten steel toward the top of the auxiliary dam is caused by the inclusion float block. The inclusions can be separated from the molten steel even when the flowability of the molten steel is insufficient at the time of connecting the molten steel to the tundish or at the end of casting. As a result, it is possible to prevent the inclusion from being injected into the mold due to the lack of fluidity of the molten steel during the ladle connection or at the end of the casting to lower the quality of the slab.

If the inclusion float block is provided so as to face the remaining dam hole of the auxiliary dam and is formed to be equal to or slightly larger than the width of the residual hole, molten steel on the tundish bottom side, which is not given upward flowability by the inclusion float block, So that the inclusions contained in the molten steel can be collected by the tundish flux.

1 is a perspective view schematically showing a general continuous casting line.
FIG. 2 is a cross-sectional view of the continuous casting line of FIG. 1, showing in detail a dam installed in a tundish.
3 is a cross-sectional view of a tundish including a tundish dam according to an embodiment of the present invention.
4 is a plan view of a tundish dam according to an embodiment of the present invention.
5 is a perspective view showing in detail an inclusion float block of a tundish dam 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.

The tundish dam according to an embodiment of the present invention can be used in place of a conventional dam installed in the tundish of the continuous casting line shown in FIG.

1 and 3, a ladle 100 is provided on the upper side of the tundish 1 and a continuous casting mold 110 is provided on the lower side of the tundish 1. The molten steel M contained in the ladle 100 is introduced into the tundish 1 via the injection nozzle 102 and the molten steel injected into the tundish 1 is introduced into the immersion nozzle 2 to the continuous casting mold 110. [

The tundish dam according to an embodiment of the present invention is installed between the injection nozzle 102 and the immersion nozzle 2 in the tundish 1. [ 3, the tundish dam according to one embodiment of the present invention includes a main dam 30, an auxiliary dam 40, and an inclusion float block 50. As shown in FIG.

The main dam 30 is a plate-like member provided in the tundish 1 in a direction perpendicular to the injection nozzle 102. The lower end of the main dam 30 is spaced apart from the bottom of the tundish 1 by a predetermined distance so that the molten steel M supplied to the tundish 1 through the injection nozzle 102 flows into the main dam 30 And flows toward the auxiliary dam 40 through the lower side.

The auxiliary dam 40 is a plate-shaped member which is provided inside the tundish 1 and extends upward from the bottom of the tundish 1 at a position close to the immersion nozzle 2 by a predetermined height. Preferably, the height of the auxiliary dam (40) is higher than the lower end of the main dam (30). The molten steel passing through the lower side of the main dam 30 and then passing over the upper side of the auxiliary dam 40 flows in a substantially S-shaped shape, and the separation of the inclusions from the molten steel can be easily carried out. On the lower side of the auxiliary dam 40, a remaining hot hole 42 is formed. As shown in FIG. 4, the remaining hot hole 42 is formed at the center of the lower side of the auxiliary dam 40.

Between the main dam 30 and the auxiliary dam 40, an inclusion float block 50, which is a characteristic component of the present invention, is installed. 3 and 4, the inclusion float block 50 is spaced apart from the residual drain hole 42 of the auxiliary dam 40 by a predetermined distance, preferably about 300 mm, To the bottom of the tundish (1).

As shown in more detail in FIG. 5, the inclusion float block 50 has a sloped surface 52 on its upper surface that is lower toward the main dam 30, As shown in Fig. In the embodiment of the present invention, the upper surface of the inclusion float block 50 is provided with the inclined surface 52 as well as the inclined surface 52. Alternatively, the inclusion float block 50 may have the inclined surface 52 as a whole.

The height of the inclusion float block 50 is approximately equal to or slightly higher than the height of the residual flood hole 42. The width of the inclusion float block 50 is formed to be equal to or slightly larger than the width of the remained hole 42. [

The operation of the tundish dam according to one embodiment of the present invention having the above-described structure will now be described.

The molten steel M injected from the ladle 100 through the injection nozzle 102 into the tundish 1 flows over the upper side of the auxiliary dam 40 after passing through the lower side of the main dam 30 and flows into the immersion nozzle 2 To the mold 110. [0050] Since the molten steel M has sufficient fluidity while the molten steel M is being supplied from the ladle 100, the separation of the inclusions contained in the molten steel M during the flow of the molten steel over the upper side of the auxiliary dam 40 It is easily done. The inclusion float block 50 installed between the main dam 30 and the auxiliary dam 40 plays a role of further activating the flow of the molten steel M. [

On the other hand, at the time of connecting the ladle 100 to the tundish 1 or casting the residue at the end of the casting, the flowability of the molten steel M in the tundish 1 becomes insufficient. However, due to the inclusion float block 50 installed between the main dam 30 and the auxiliary dam 40, the molten steel is given the fluidity of flowing upward on the inclined surface 52 of the inclusion float block 50. Accordingly, the inclusions can be separated from the molten steel even when the ladle is connected or cast.

Since the width of the inclusion float block 50 is equal to or slightly larger than the width of the residual flood hole 42, the molten steel which does not flow upward along the inclined surface 52 of the inclusion float block, Flows along the side surface of the block 50 and flows through the remaining hot hole 42. In this process, the inclusions contained in the molten steel M can be collected by the tundish flux.

The present invention is applied to the tundish 1 in which the ladle 100 is provided on the center side of the tundish 1 and the mold 110 is provided on both sides of the lower side of the tundish 1 It will be understood by those skilled in the art that two ladles 100 are provided on both sides of the upper portion of the tundish 1 and one mold 110 is provided on the lower central side of the tundish It will be understood that the present invention may be applied to the case where the present invention is applied.

The molten steel M passing through the main dam 30 and flowing toward the auxiliary dam 40 is introduced into the auxiliary dam 40 by the inclusion float block 50. In this way, So that the inclusion of the molten steel (molten steel) can be reduced even when the flowability of the molten steel M is insufficient when the ladle 100 is connected to the tundish 1 or when the molten steel M is cast at the end of the casting M). &Lt; / RTI > Accordingly, it is possible to prevent the inclusion from being injected into the mold 110 due to lack of fluidity of the molten steel (M) during the ladle connection or at the end of the casting to deteriorate the quality of the slab (S).

If the inclusion float block 50 is provided so as to face the residual water hole 42 of the auxiliary dam 40 and is equal to or slightly larger than the width of the residual water hole 42, The molten steel M on the bottom side of the tundish 1 which is not subjected to the rotation of the tundish 1 is bypassed to the side surface of the inclusion float block 50 and flows into the remaining tundish hole 42. Accordingly, Can be collected by the dish flux.

In the foregoing, the present invention has been shown and described with reference to certain preferred embodiments. 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 or scope of the inventive concept as defined by the appended claims. You can do it.

1: Tundish 2: Immersion nozzle
30: main dam 40: auxiliary dam
42: Jongtam Hall 50: Inclusions Floating block
100: ladle 102: injection nozzle
110: continuous casting mold S: slab

Claims

A main dam installed vertically between an injection nozzle of ladle supplying molten steel from the ladle to the tundish and an immersion nozzle for injecting molten steel in the tundish into the mold, the lower end of which is spaced apart from the bottom of the tundish by a predetermined distance, ;
An auxiliary dam which is installed to extend from the bottom of the tundish to a predetermined height upward at a position closer to the immersion nozzle than the main dam and has a bottom hole at the lower central portion for forming a residual hole for guiding the tundish of molten steel to the immersion nozzle; And
And an inclusion float block installed between the main dam and the auxiliary dam and having a shape that floats the inclusion from the molten steel flowing through the space between the main dam and the tundish bottom and toward the auxiliary dam. Yong Tandish Dam.

The method according to claim 1,
Wherein the inclusion float block has an inclined surface inclined upward from the main dam side toward the auxiliary dam side on the upper surface thereof.

The method according to claim 1,
Wherein the inclusive float block is spaced apart from the remaining dam hole of the auxiliary dam by a predetermined distance and is installed so as to face the remaining hot hole.

4. The method according to any one of claims 1 to 3,
Wherein the inclusive float block has a width equal to or greater than a width of a residual hole of the auxiliary dam.

5. The method of claim 4,
Wherein the inclusive float block has a height equal to or higher than a height of the residual hole of the auxiliary dam.