Device and Method for preventing the Growth of Slag Bear in the Mold for Continuous Casting of Steel

专利摘要:
PURPOSE: An apparatus and a method for preventing the formation of slag bear in a continuous casting mold is provided to prevent generation of break-out, improve surface shape of a steel billet and directly observe level and surface flow rate of molten steel by liquefying mold flux itself injected into molten steel in a mold. CONSTITUTION: The apparatus for preventing the formation of slag bear in a continuous casting mold comprises a crucible(4) installed at the outer part of a mold(10) to melt mold flux(3); a cover(8) which is installed to cover the upper part of the mold(10), the inner surface of which directly faces molten steel(12), and which is consisted of a material having a high reflectivity; and a supplying tube(7) for conveying the mold flux(3) from the crucible(4) to the mold(10). The method for preventing the formation of slag bear in a continuous casting mold comprises the steps of melting mold flux from the outer part of a mold(10); injecting the molten mold flux(3) onto the surface of molten steel; and cutting off radiant heat from molten steel(12).
公开号:KR20020052622A
申请号:KR1020000082020
申请日:2000-12-26
公开日:2002-07-04
发明作者:조중욱
申请人:이구택；주식회사 포스코；
IPC主号:

专利说明:

Device and method for preventing the growth of slag bear in the mold for continuous casting of steel}
[13] The present invention relates to an apparatus and a method for preventing the generation of slag bear in a continuous casting mold, and more particularly, to an apparatus and method for improving the quality of a product by injecting a mold flux as a liquid into the surface during continuous casting of steel. It is about.
[14] In the continuous casting operation of steel, mold flux, which is a subsidiary material, is generally introduced in powder or granular form. Thus, as in FIG. 3, the mold flux is divided into a powder layer 16, a sintered layer (semi-melt layer) 17, and a liquid layer 9, respectively. Since the liquid layer 9 is almost transparent, radiation waves having a wavelength between 0.5 and 4 mm emitted from the molten steel easily pass. On the other hand, since the sintered layer 17 and the powder layer 16 are optically opaque, the sintered layer 17 and the powder layer 16 prevent radiation from dropping sharply by blocking radiation.
[15] On the other hand, at the point where the liquid mold flux 9 flows between the mold 10 and the solidification shell 11, a slag bear 20 is usually attached to the mold 10. As the slag bear gradually increases, the inflow of the liquid mold flux 9 is hindered, so that the lubrication function between the cast steel and the mold 10 is reduced and heat transfer becomes uneven, causing break-out or surface cracking of the cast steel.
[16] On the contrary, in Korean Patent Publication No. 1998-038065 (Baek Chan-Joon et al.) Or US Patent US5577545 (Philips et al.), Graphite or fine carbon black is coated together to lower the dissolution rate of the mold flux. Disclosed is a method of suppressing growth of the. However, this method not only prevents the slag bears inherently, but also when the dissolution rate of the mold flux is low, unmelted mold flux enters between the solidification shell and the mold, rather it causes non-uniformity of solidification and break-out. There is a problem that deepens the defect.
[17] The present invention has been made to solve the above problems, the object of the invention is to liquefy the mold flux itself is injected into the molten steel of the molten steel in the mold to prevent the creation of slag bear and to form a uniform solidification shell in the initial solidification step The present invention provides a device and a method for not only preventing occurrence of break-out but also improving the surface shape of a cast steel and directly observing high temperature phenomena such as molten steel level and surface flow rate on the molten steel surface.
[1] 1 is a schematic cross-sectional configuration diagram showing an apparatus for introducing a mold flux according to the present invention during continuous casting of steel,
[2] 2 is a cross-sectional view showing the structure near the mold when the mold flux is added according to the present invention during continuous casting of steel,
[3] 3 is a cross-sectional view showing the structure near the mold when the mold flux is introduced according to the prior art during continuous casting of steel.
[4] <Description of Major Reference Signs>
[5] 1 ... mold flux raw material 2 ... mold flux dissolving device (heating element)
[6] 3 ... liquid mold flux (pre-injection) 4 ... crucible
[7] 5 ... Valve 6 ... Immersion Nozzle
[8] 7 ... tube for liquid flux supply 8 ... cover
[9] 9 ... liquid mold flux (after injection) 10 ... mould (copper plate)
[10] 11 ... solidification shell 12 ... molten steel
[11] 15 ... solid slag film 16 ... powder layer of mold flux
[12] 17. Sintered layer of mold flux 20 ... slag bear
[18] In order to achieve the above object, the present invention is a crucible is provided on the outside of the mold to melt the mold flux; A cover which is installed to cover the upper part of the mold, and whose inner surface faces the molten steel, is made of a material having high reflectance; And means for transferring mold flux from the crucible to the mold.
[19] Therefore, the process of supplying the mold flux during continuous casting according to the present invention comprises the steps of: dissolving the mold flux from the outside of the mold; Injecting the molten mold flux to the molten steel surface through a delivery means; It blocks the radiant heat from the molten steel.
[20] Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;
[21] 1 is a schematic illustration of a continuous casting apparatus to which the present invention is applied.
[22] First, the mold flux raw material 1 is charged into the crucible 4. The crucible 4 is made of metal, graphite, or the like. The crucible 4 is maintained above the melting temperature of the flux 1 by resistance heating 2 or the like. Thus, the raw material 1 of the charged mold flux is completely dissolved in the liquid phase 3.
[23] Then, the molten liquid flux 3 dissolved in this way is transferred to the molten steel 12 surface in the mold 10 through a flux delivery means such as a supply tube 7. At this time, it is preferable that the flow amount is controlled through the valve (5).
[24] On the other hand, a cover 8 is provided on the upper surface of the mold 10. The inner surface of the cover 8, that is, the part facing the molten steel 12, is formed of a material having high reflectivity such as an aluminum mirror or a gold coated mirror, so that the radiation wave emitted from the molten steel surface is reflected, and again the mold flux 9 Or by being absorbed into the molten steel 12 surface, minimizing the drop in the molten steel surface temperature and preventing the liquid mold flux 9 from solidifying again on the mold 10 wall surface.
[25] 2 shows a state in which the production of slag bears is suppressed by combustion casting operation of steel by the apparatus and method according to the present invention. As shown in the figure, during continuous casting, a uniform amount of liquid mold flux 9 is continuously introduced between the solidification shell 11 and the mold 10.
[26] According to the present invention having the above-described configuration, since the mold flux is preliminarily liquefied before being injected into the molten steel of the molten steel in the mold, the formation of the slag bear is suppressed and a uniform solidification shell is formed in the initial solidification step. Not only the occurrence of break-out due to attachment is prevented, but also the surface shape of the cast steel is greatly improved.
[27] In addition, there is an advantage that high-temperature phenomena such as the level and surface flow rate of molten steel can be directly observed on the molten steel surface.

权利要求:
Claims (2)
[1" claim-type="Currently amended] In the device for preventing the generation of slag bear in the continuous casting mold,
A crucible 4 provided outside the mold 10 for dissolving the mold flux 3;
A cover 8 installed to cover the upper portion of the mold 10 and directly facing the molten steel 12, the cover 8 being made of a material having high reflectance;
A supply tube (7) for transferring the mold flux (3) from the crucible (4) to the mold (10);
Apparatus for preventing the generation of slag bear in the continuous casting mold, characterized in that consisting of.
[2" claim-type="Currently amended] Dissolving the mold flux 3 from the outside of the mold 10;
Injecting the molten mold flux (3) into the molten steel surface;
Blocking radiant heat from the molten steel 12;
Method for preventing the generation of slag bear in the continuous casting mold, characterized in that consisting of.

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同族专利:

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公开号 | 公开日

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KR100661821B1|2006-12-27|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2000-12-26|Application filed by 이구택, 주식회사 포스코

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2000-12-26|Priority to KR1020000082020A

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2002-07-04|Publication of KR20020052622A

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2006-12-27|Application granted

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2006-12-27|Publication of KR100661821B1

优先权:

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申请号 | 申请日 | 专利标题

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KR1020000082020A|KR100661821B1|2000-12-26|2000-12-26|Device and Method for preventing the Growth of Slag Bear in the Mold for Continuous Casting of Steel|