KR100661821B1 - Device and Method for preventing the Growth of Slag Bear in the Mold for Continuous Casting of Steel - Google Patents

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

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KR100661821B1
KR100661821B1 KR1020000082020A KR20000082020A KR100661821B1 KR 100661821 B1 KR100661821 B1 KR 100661821B1 KR 1020000082020 A KR1020000082020 A KR 1020000082020A KR 20000082020 A KR20000082020 A KR 20000082020A KR 100661821 B1 KR100661821 B1 KR 100661821B1
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mold
flux
molten steel
continuous casting
mold flux
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KR20020052622A (en
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조중욱
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주식회사 포스코
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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
    • B22D11/108—Feeding additives, powders, or the like
    • 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
    • B22D11/07—Lubricating the moulds

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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

본 발명은 강의 연속주조용 몰드에 액상 몰드 플럭스를 투입하여 슬래그 베어의 생성을 방지하는 장치 및 방법에 관한 것으로서,The present invention relates to an apparatus and method for preventing the generation of slag bear by injecting a liquid mold flux into a continuous casting mold of steel,

몰드의 외부에 설치되고 몰드 플럭스를 용해하도록 된 도가니와, 상기 몰드의 상부를 덮도록 설치되되, 용강에 직접 면하는 내면(內面)이 반사율이 높은 알루미늄 거울 또는 골드 코팅 거울로 된 커버와, 상기 도가니로부터 상기 몰드로 상기 몰드 플럭스를 전달시키기 위한 공급용 튜브로 구성되어 있으므로,A crucible installed on the outside of the mold to dissolve the mold flux, a cover made of an aluminum mirror or a gold coated mirror having a high reflectance on an inner surface directly facing the molten steel and covering the upper portion of the mold; Since it is composed of a supply tube for transferring the mold flux from the crucible to the mold,

슬래그 베어의 생성이 억제되어 초기 응고단계에서 균일한 응고 셸이 형성되기 때문에, 응고 셸이 주형에 부착되는 것으로 인한 브레이크-아웃의 발생이 방지될 뿐만 아니라 주편의 표면 형상이 크게 개선된다는 이점이 있다.Since the formation of the slag bear is suppressed to form a uniform solidification shell in the initial solidification step, the break-out caused by the solidification shell attached to the mold is not only prevented, but the surface shape of the slab is greatly improved. .

연속주조, 용강, 몰드, 슬래그 베어, 몰드 플럭스, 응고 셸Continuous Casting, Molten Steel, Mold, Slag Bare, Mold Flux, Solidified Shell

Description

연속주조용 몰드에서 슬래그 베어의 생성을 방지하는 장치 및 그 방법{Device and Method for preventing the Growth of Slag Bear in the Mold for Continuous Casting of Steel}Device and method for preventing the growth of slag bear in the mold for continuous casting of steel}

도 1은, 강의 연속주조시, 본 발명에 따라 몰드 플럭스를 투입하는 장치를 도시하는 개략적인 단면 구성도이고,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,

도 2는, 강의 연속주조시, 본 발명에 따라 몰드 플럭스를 투입한 경우 몰드 근방의 조직을 도시하는 단면도이고,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,

도 3은, 강의 연속주조시 종래기술에 따라 몰드 플럭스를 투입한 경우 몰드 근방의 조직을 도시하는 단면도이다.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.

<주요 도면부호의 설명><Description of Major Reference Signs>

1... 몰드 플럭스 원료 2... 몰드 플럭스 용해장치(발열체)1 ... mold flux raw material 2 ... mold flux dissolving device (heating element)

3... 액상 몰드 플럭스(투입전) 4... 도가니3 ... liquid mold flux (pre-injection) 4 ... crucible

5... 밸브 6... 침지노즐5 ... Valve 6 ... Immersion Nozzle

7... 액상 플럭스 공급용 튜브 8... 커버7 ... tube for liquid flux supply 8 ... cover

9... 액상 몰드 플럭스(투입후) 10... 몰드(동판)9 ... liquid mold flux (after injection) 10 ... mould (copper plate)

11... 응고 셸 12... 용강11 ... solidification shell 12 ... molten steel

15... 고상 슬래그 필름 16... 몰드 플럭스의 파우더 층 15 ... solid slag film 16 ... powder layer of mold flux                 

17... 몰드 플럭스의 소결 층 20... 슬래그 베어(slag bear)17. Sintered layer of mold flux 20 ... slag bear

본 발명은 연속주조용 몰드에서 슬래그 베어의 생성을 방지하는 장치 및 그 방법에 관한 것으로서, 특히 철강의 연속주조시 몰드 플럭스를 액상으로서 탕면에 투입함으로써 제품의 질을 개선하기 위한 장치 및 그 방법에 관한 것이다.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.

철강의 연속주조 조업시 부자재인 몰드 플럭스는 일반적으로 분말 혹은 과립형으로 투입한다. 따라서, 도 3에서와 같이, 몰드 플럭스는 각각 파우더 층(16), 소결 층(반 용융층)(17), 액상 층(9)으로 구분된다. 이 중 액상 층(9)은 거의 투명하기 때문에 용강에서 발산되는 0.5∼4mm 사이의 파장을 가지는 복사파가 쉽게 통과하게 된다. 반면에 소결 층(17) 및 파우더 층(16)은 광학적으로 불투명하므로 복사파를 차단하여 탕면온도가 급격히 떨어지는 것을 방지하는 것이다.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.

한편, 액상의 몰드 플럭스(9)가 주형(10)과 응고 셸(shell)(11) 사이로 유입되는 지점에서는, 통상 주형(10)에 슬래그 베어(slag bear)(20)가 부착된다. 슬래그 베어가 점차 커지면 액상 몰드 플럭스(9)의 유입이 방해되기 때문에, 주편과 주형(10)사이의 윤활기능이 떨어지고 열전달이 불균일하게 되어, 주편의 브레이크-아웃이나 표면 크랙이 유발되게 된다.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.

이에 대하여, 국내공개특허 제1998-038065(백찬준 등) 또는 미국특허 US5577545호(Philips 등)에는 그라파이트(graphite)나 미세한 카본 블랙(carbon black)을 함께 도포하여 몰드 플럭스의 용해속도를 낮춤으로써 상기 슬래그 베어의 성장을 억제하는 방안이 개시되어 있다. 그러나, 이러한 방법은 슬래그 베어를 원천적으로 방지하지 못할 뿐만 아니라, 몰드 플럭스의 용해속도가 낮을 때는 미용융상태의 몰드 플럭스가 응고 셸과 주형 사이로 유입되게 되어 오히려 응고의 불균일화를 초래하고 브레이크-아웃 결함을 심화시키게 되는 문제점이 있다.On the other hand, in Korean Laid-Open Patent 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 inhibiting growth of a bear. 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.

본 발명은 상기한 문제점을 해결하기 위해 안출된 것으로서, 발명의 목적은 몰드 내 용강의 탕면에 투입되는 몰드 플럭스 자체를 액상화함으로써 슬래그 베어의 생성을 방지하고 초기 응고단계에서 균일한 응고 셸을 형성하도록 하여 브레이크-아웃 발생을 방지할 뿐만 아니라 주편 표면 형상을 개선하며 용강 표면에서 용강의 레벨 및 표면 유속 등 고온 현상을 직접 관찰할 수 있는 장치 및 그 방법을 제공하는데 있다.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.

상기한 목적을 달성하기 위해, 본 발명은 몰드(10)의 외부에 설치되고, 몰드 플럭스(3)를 용해하도록 된 도가니(4)와; 상기 몰드(10)의 상부를 덮도록 설치되되, 용강(12)에 직접 면하는 내면(內面)이 반사율이 높은 알루미늄 거울 또는 골드 코팅 거울로 된 커버(8)와; 상기 도가니(4)로부터 상기 몰드(10)로 상기 몰드 플럭스(3)를 전달시키기 위한 공급용 튜브(7)로 구성되는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a crucible (4) which is installed outside the mold (10) and is adapted to dissolve the mold flux (3); A cover 8 installed to cover the upper part of the mold 10, the inner surface of the mold 10 directly facing the molten steel 12 having an aluminum mirror or a gold coated mirror having high reflectance; It is characterized in that it consists of a supply tube (7) for transferring the mold flux (3) from the crucible (4) to the mold (10).

따라서, 본 발명에 따른 연속주조시 몰드 플럭스를 공급하는 공정은, 몰드(10)의 외부로부터 몰드 플럭스(3)를 용해하는 단계와; 상기 용해된 몰드 플럭스(3)를 용강 표면에 투입하는 단계와; 용강(12) 탕면에서 방출되는 복사파가 커버(8)의 내면에서 반사되어 몰드 플럭스 혹은 용강으로 다시 흡수되는 단계로 이루어져 있다.Therefore, the process of supplying the mold flux during continuous casting according to the present invention comprises the steps of: dissolving the mold flux 3 from the outside of the mold 10; Injecting the molten mold flux (3) into the molten steel surface; Radiation waves emitted from the molten steel 12 surface are reflected by the inner surface of the cover 8 and absorbed back into the mold flux or molten steel.

이하, 첨부도면을 참조하여 본 발명의 일 실시예를 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

도 1에 본 발명이 적용되는 연속 주조 장치가 개략적으로 도시되어 있다.1 is a schematic illustration of a continuous casting apparatus to which the present invention is applied.

먼저, 몰드 플럭스 원료(1)가 도가니(4) 내로 장입된다. 상기 도가니(4)는 금속이나 흑연 등으로 구성되어 있다. 그리고, 이 도가니(4)는 저항가열(2) 등에 의해서 플럭스(1)의 용해온도 이상으로 유지된다. 이에 따라, 장입된 몰드 플럭스의 원료(1)는 액상(3)으로 완전히 용해된다.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.

다음, 이와 같이 용해된 액상 몰드 플럭스(3)는 공급용 튜브(7) 등 플럭스 전달 수단을 통해 몰드(10) 내의 용강(12) 표면으로 전달된다. 이 때, 밸브(5)를 통해 유동량이 조절되는 것이 바람직하다.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).

한편, 상기 몰드(10)의 상면에는 커버(8)가 설치되어 있다. 그리고, 이 커버(8)의 내면, 즉 용강(12)에 면하는 부분은 알루미늄 거울이나 골드 코팅 거울 등 반사율이 높은 소재로 형성되어 있어 용강 탕면에서 방출되는 복사파가 반사되어 다시 몰드 플럭스(9) 혹은 용강(12) 표면으로 흡수되므로, 용강표면온도의 하강을 최소화 함과 동시에 액상 몰드 플럭스(9)가 주형(10) 벽면에서 다시 응고되는 것이 방지된다.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.

도 2에는, 본 발명에 따른 장치 및 방법에 의해 강을 연소주조 조업함으로써 슬래그 베어의 생성이 억제된 상태가 도시되어 있다. 도면에서와 같이, 연속주조시, 항상 균일한 양의 액상 몰드 플럭스(9)가 연속적으로 응고 셸(11)과 주형(10) 사이로 유입되게 되어 있다.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, in continuous casting, a uniform amount of liquid mold flux 9 is always introduced continuously between the solidification shell 11 and the mold 10.

상기한 바와 같은 구성의 본 발명에 따르면, 몰드 내 용강의 탕면에 투입되기 전에 몰드 플럭스를 미리 액상화함으로써 슬래그 베어의 생성이 억제되고 초기 응고단계에서 균일한 응고 셸이 형성되므로, 응고 셸이 주형에 부착되는 것으로 인한 브레이크-아웃의 발생이 방지될 뿐만 아니라 주편의 표면 형상이 크게 개선된다는 이점이 있다.According to the present invention having the above-described configuration, since the mold flux is liquefied in advance before being injected into the molten steel of the molten steel in the mold, the generation of 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.

또, 용강 표면에서 용강의 레벨 및 표면 유속 등, 고온 현상을 직접 관찰할 수도 있다는 장점이 있다.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.

Claims (2)

연속주조용 몰드에서 슬래그 베어의 생성을 방지하는 장치에 있어서,In the device for preventing the generation of slag bear in the continuous casting mold, 몰드(10)의 외부에 설치되고, 몰드 플럭스(3)를 용해하도록 된 도가니(4)와;A crucible 4 installed outside the mold 10 and adapted to dissolve the mold flux 3; 상기 몰드(10)의 상부를 덮도록 설치되되, 용강(12)에 직접 면하는 내면(內面)이 반사율이 높은 알루미늄 거울 또는 골드 코팅 거울로 된 커버(8)와;A cover 8 installed to cover the upper part of the mold 10, the inner surface of the mold 10 directly facing the molten steel 12 having an aluminum mirror or a gold coated mirror having high reflectance; 상기 도가니(4)로부터 상기 몰드(10)로 상기 몰드 플럭스(3)를 전달시키기 위한 공급용 튜브(7)로 구성되는 것을 특징으로 하는 연속주조용 몰드에서 슬래그 베어의 생성을 방지하는 장치.Apparatus for preventing the generation of slag bear in a continuous casting mold, characterized in that it consists of a supply tube (7) for transferring the mold flux (3) from the crucible (4) to the mold (10). 몰드(10)의 외부로부터 몰드 플럭스(3)를 용해하는 단계와;Dissolving the mold flux 3 from the outside of the mold 10; 상기 용해된 몰드 플럭스(3)를 용강 표면에 투입하는 단계와;Injecting the molten mold flux (3) into the molten steel surface; 용강(12) 탕면에서 방출되는 복사파가 커버(8)의 내면에서 반사되어 몰드 플럭스 혹은 용강으로 다시 흡수되는 단계로 구성되는 것을 특징으로 하는 연속주조용 몰드에서 슬래그 베어의 생성을 방지하는 방법.A method for preventing the production of slag bear in a continuous casting mold, characterized in that the radiation wave emitted from the molten steel (12) molten steel is reflected from the inner surface of the cover (8) to be absorbed back into the mold flux or molten steel.
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