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WO2020111530A1 - Apparatus for preventing reoxidation of molten steel - Google Patents

Apparatus for preventing reoxidation of molten steel Download PDF

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Publication number
WO2020111530A1
WO2020111530A1 PCT/KR2019/014340 KR2019014340W WO2020111530A1 WO 2020111530 A1 WO2020111530 A1 WO 2020111530A1 KR 2019014340 W KR2019014340 W KR 2019014340W WO 2020111530 A1 WO2020111530 A1 WO 2020111530A1
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WO
WIPO (PCT)
Prior art keywords
molten steel
insertion block
preventing
oxidation
ladle
Prior art date
Application number
PCT/KR2019/014340
Other languages
French (fr)
Korean (ko)
Inventor
이상동
Original Assignee
주식회사 포스코
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Publication of WO2020111530A1 publication Critical patent/WO2020111530A1/en

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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
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting

Definitions

  • the present invention relates to an apparatus for preventing re-oxidation of molten steel for preventing re-oxidation of molten steel.
  • molten steel which has been blown out of a converter, is discharged to a ladle, and is moved to a secondary refining step for component adjustment of the molten steel, temperature uniformity, desulfurization, and inclusion control.
  • an inert gas such as argon (Ar) may be blown through a deodorizing nozzle installed at a lower portion of the molten steel to stir the molten steel by argon bubbling.
  • argon bubbling of molten steel in the ladle is for stirring of molten steel and floating separation of inclusions.
  • the argon bubbles generated during the argon bubbling process As it rises to the top of the molten steel, it collides and collects the non-metallic inclusions present in the molten steel, thereby promoting the action of removing the non-metallic inclusions into a slag layer formed on the surface of the molten steel.
  • the molten steel may come into contact with the atmosphere in the process of escaping the slag layer, and a spattering phenomenon may occur.
  • the vibration generated in the argon bubbling process is sensed, and when the magnitude of the vibration exceeds a certain level, the supply flow rate of argon gas is adjusted to form the slag layer. I control the size of the natang.
  • One embodiment of the present invention to provide a molten steel property prevention device for preventing the re-oxidation of molten steel caused by hot water open to the atmosphere in the slag layer of the molten steel surface.
  • An embodiment of the present invention is an apparatus for preventing re-oxidation of molten steel formed on a surface of a slag layer contained in a ladle, an insertion block that is disposed above the ladle and is elevated in the ladle to be inserted into the slag layer. , It includes a driving unit for raising or lowering the insertion block.
  • the insertion block may be formed of a refractory material.
  • the insert block can be formed of a steel material.
  • the insert block can be equipped with a cooler.
  • the cooler may include a cooling jacket formed inside the insertion block to move the cooling water, and a cooling water supply unit supplying cooling water to the cooling jacket.
  • the driving unit may include a connector member protruding above the insertion block, and an elevator connected to the connector member to provide an upward or downward pressure.
  • the lift may be a hydraulic cylinder having a rod connected to a connector member.
  • a plurality of protrusions may protrude on the bottom surface of the insertion block.
  • the insertion block in the process of stirring operation of molten steel by supply of argon gas from the inside of the ladle, the insertion block is inserted to increase the height of the slag layer, the molten steel by air bubbles of argon gas It is possible to improve the quality of molten steel by preventing the occurrence of sprinkling.
  • FIG. 1 is a perspective view schematically showing a state in which an apparatus for preventing re-oxidation of molten steel according to a first embodiment of the present invention is installed.
  • FIG. 2 is a perspective view schematically showing a ladle of the apparatus for preventing re-oxidation of molten steel of FIG. 1.
  • FIG. 3 is a cross-sectional view schematically showing the ladle of FIG. 2.
  • FIG. 4 is a side view schematically showing an apparatus for preventing re-oxidation of molten steel according to a first embodiment of the present invention.
  • FIG. 5 is a side view schematically showing a state in which the insertion block of FIG. 4 is lowered and inserted into the slag layer on the upper side of the molten steel.
  • FIG. 6 is a sectional view of the main parts schematically showing an insert block in which a cooler of an apparatus for preventing re-oxidation of molten steel according to a second embodiment of the present invention is installed.
  • FIG. 7 is a bottom perspective view schematically showing an insertion block according to a third embodiment of the present invention.
  • FIG. 1 is a perspective view schematically showing a state in which a molten steel re-oxidation prevention apparatus according to a first embodiment of the present invention is installed
  • FIG. 2 is a perspective view schematically showing a ladle of the molten steel re-oxidation prevention apparatus in FIG. 1
  • FIG. 3 is a cross-sectional view schematically showing the ladle of FIG. 2.
  • a slag layer 18 is formed on the surface and is injected into the interior of the ladle 10
  • the insertion block 20 and the insertion block 20 inserted into the slag layer 18 are raised or lowered in the storage space 11 of the ladle 10 and inserted therein. It includes a driving unit 30 for raising or lowering.
  • the ladle 10 may be formed with a storage space 11 in which molten steel 14, which has been blown out from the converter, is stored. That is, in the ladle 10, molten steel manufactured in a primary refining furnace of an electric furnace or an electric furnace is stored therein, so that secondary refining treatment suitable for a casting process may be performed.
  • the ladle 10 may have a cylindrical storage space 11 formed therein, and an opening 12 into which molten steel 14 is introduced may be formed at the top.
  • An inert gas such as argon (Ar) is supplied to the ladle 10 through the deodorizing nozzle 16 connected to the gas supply source 16a, and the molten steel by bubbling of the argon gas 16b
  • argon Ar
  • the stirring action and the floating and separating action of the non-metallic inclusion included in the molten steel may be performed.
  • the stirring operation of the molten steel 14 is performed by the supply of argon gas 16b, and the preparation material and the ferroalloy input to the storage space 11 of the ladle 10 are molten steel ( It can be easily dissolved in 14) can be made to the uniformity of the molten steel component.
  • the argon bubbles (16c, see FIG. 5) generated by the supply of argon gas (16b) is collided and trapped in the non-metallic inclusions present in the molten steel, the non-metallic inclusions are removed to the slag layer 18 The action can be further accelerated.
  • the insertion block 20 may be disposed on the upper portion of the ladle 10. More specifically, the insertion block 20 located on the top of the ladle 10 may be inserted through the opening 12 to be installed to be raised or lowered inside the ladle 10, that is, in the storage space 11.
  • the insertion block 20 may be installed to prevent the molten steel 14 from coming into contact with the atmosphere in the process of leaving the slag layer 18 as argon gas rises to the top of the molten steel 14.
  • FIG. 4 is a side view schematically showing a device for preventing re-oxidation of molten steel according to a first embodiment of the present invention
  • FIG. 5 schematically shows a state in which the insertion block of FIG. 4 is lowered and inserted into the slag layer on the upper side of the molten steel. Side view.
  • the insertion block 20 is installed to be raised or lowered inside the storage space 11 of the ladle 10, and a slag layer formed on the top of the molten steel 14 (18).
  • the height (h, see FIG. 4) of the slag layer 18 formed on the upper side of the molten steel 14 is temporarily increased (h' (See FIG. 5), in order to prevent sputtering of the surface of the molten steel 14 from being exposed to the air during the process of passing the slag layer 18 through the argon bubbles 16c generated in the molten steel 14 will be.
  • the insertion block 20 may be partially inserted into the interior of the slag layer 18, and may be entirely inserted into the interior of the slag layer 18 depending on the height of the slag layer 18.
  • the insertion block 20 may be formed into a cylindrical shape having a diameter smaller than that of the storage space 11 as being raised or lowered in a spaced apart state on the inner wall surface of the storage space 11 of the ladle 10.
  • the insertion block 20 is not necessarily limited to a cylindrical shape, and may be appropriately changed and applied to a polygon having a corner or a part of the edge.
  • the insertion block 20 is exemplarily described as being formed of a refractory material in this embodiment to prevent thermal damage from occurring in the process of contacting the slag layer 18.
  • the insertion block 20 is not necessarily limited to being formed of a refractory material, and may be appropriately changed to a predetermined material that does not cause damage due to heat of the molten steel 14.
  • the insertion block 20 may be lowered into the storage space 11 of the ladle 10 by the driving force of the driving unit 30 which will be described later and inserted into the slag layer 18.
  • the driving unit 30 may be installed to be connected to the insertion block 20 to provide an upward or downward driving force to the insertion block 20.
  • the driving unit 30 may include a connector member 31 protruding from the upper side of the insertion block 20 and an elevator 33 connected to the connector member 31 to provide an upward or downward pressure.
  • the connector member 31 may have one end connected to the upper side of the insertion block 20 and the other end connected to the elevator 33.
  • the connector member 31 protrudes in the shape of a cylindrical rod on the upper side of the insertion block 20 and can be connected to the elevator 33.
  • the connector member 31 is not necessarily limited to a cylindrical rod shape, and may be appropriately changed to various shapes in consideration of durability and installation position.
  • the connector member 31 is exemplarily described as being connected in a fixed state between the insertion block 20 and the elevator 33, but is rotatable on each or any one of the insertion block 20 or the elevator 33 It is also possible to connect.
  • the lift 33 may be applied as a hydraulic cylinder to which the rod 32 is connected to the protruding end of the connector member 31.
  • the elevator and the hydraulic cylinder use the same reference number.
  • the insert block 20 is slag Since it is inserted to increase the height of the layer 18, it is possible to improve the quality of the molten steel 14 by preventing generation of molten steel by bubbles of argon gas.
  • FIG. 6 is a sectional view of the main parts schematically showing an insert block in which a cooler of an apparatus for preventing re-oxidation of molten steel according to a second embodiment of the present invention is installed.
  • 1 to 5 and the same reference numbers refer to the same or similar members of the same or similar functions. Hereinafter, detailed description of the same reference numerals will be omitted.
  • the insertion block 120 of the apparatus for preventing re-oxidation of molten steel according to the second embodiment of the present invention may be formed of a steel material.
  • the inserter 120 may be provided with a cooler 130 to prevent thermal damage while being inserted into the slag layer 18.
  • the cooler 130 may include a cooling jacket 131 formed inside the insertion block 120 to move the cooling water, and a cooling water supply unit 133 supplying cooling water to the cooling jacket 131.
  • the cooling jacket 131 is formed to be extended to a long length inside the insertion block 120, and forms a flow path through which the cooling water moves, thereby preventing damage due to high temperature heat of the molten steel 14.
  • the cooling water supply unit 133 may include a cooling water passage 133a connected to the cooling jacket 131 to supply cooling water, and a pumping part 133b supplying cooling water to the cooling water passage 133a.
  • the coolant is supplied to circulate the interior of the insertion block 120, it is possible to improve durability so that the insertion block 120 is not damaged by high temperature heat.
  • FIG. 7 is a bottom perspective view schematically showing an insertion block according to a third embodiment of the present invention.
  • 1 to 6 and the same reference numerals refer to the same or similar members of the same or similar function. Hereinafter, detailed description of the same reference numerals will be omitted.
  • a protrusion 221 may protrude on the bottom surface of the insertion block 220 of the apparatus for preventing re-oxidation of molten steel according to the second embodiment of the present invention.
  • the protrusion 221 protrudes in a plurality of spaced apart from each other on the bottom surface of the insertion block 20, so it is possible to make the height of the slag layer 18 more effectively in the process of being inserted into the slag layer 18.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

An apparatus for preventing reoxidation of molten steel, according to one embodiment of the present invention, is an apparatus for preventing reoxidation of molten steel which is contained in a ladle and has a slag layer formed on the surface thereof. The apparatus comprises: an insertion block which is disposed on the top of the ladle and is lifted and lowered inside the ladle so as to be inserted into the slag layer; and a driving part for lifting or lowering the insertion block.

Description

용강 재산화 방지장치Device for preventing re-oxidation of molten steel
본 발명은 용강의 재산화 방지를 위한 용강 재산화 방지장치에 관한 것이다.The present invention relates to an apparatus for preventing re-oxidation of molten steel for preventing re-oxidation of molten steel.
일반적으로 전로에서 취련이 완료된 용강은 래들(Ladle)에 출강되어, 용강의 성분조정과 온도균일화와 탈황 및 개재물 제어를 위한 이차정련단계로 이동된다. In general, molten steel, which has been blown out of a converter, is discharged to a ladle, and is moved to a secondary refining step for component adjustment of the molten steel, temperature uniformity, desulfurization, and inclusion control.
이차정련단계에서는 용강의 하부에 설치된 저취 노즐을 통하여 아르곤(Ar) 등의 불활성가스를 취입하여 아르곤 버블링(Ar Bubbling) 발생에 의한 용강의 교반 작용이 이루어질 수 있다.In the second refining step, an inert gas such as argon (Ar) may be blown through a deodorizing nozzle installed at a lower portion of the molten steel to stir the molten steel by argon bubbling.
이와 같이, 래들에서 용강의 아르곤 버블링을 실시하는 것은, 용강의 교반 및 개재물의 부상분리를 위함이다.As described above, argon bubbling of molten steel in the ladle is for stirring of molten steel and floating separation of inclusions.
즉, 용강의 교반을 통해 래들에 투입하는 조제재 및 합금철의 용해를 용이하게 하고 성분을 균일하게 하며, 전극에 의한 승온 작업시 용강온도를 균일하게 할 수 있다.That is, it is possible to facilitate dissolution of the preparation material and alloy iron to be injected into the ladle through stirring of the molten steel, to make the components uniform, and to make the molten steel temperature uniform during the temperature rising operation by the electrode.
아울러, 아르곤 버블링 과정에서 발생되는 아르곤 기포는. 용강의 상부로 부상하면서 용강내 존재하는 비금속 개재물에 충돌 및 포집하는 바, 비금속 개재물을 용강의 표면에 형성된 슬래그(Slag)층으로 제거하는 작용을 촉진할 수 있다. In addition, the argon bubbles generated during the argon bubbling process. As it rises to the top of the molten steel, it collides and collects the non-metallic inclusions present in the molten steel, thereby promoting the action of removing the non-metallic inclusions into a slag layer formed on the surface of the molten steel.
한편, 아르곤 가스가 용강의 상부로 부상하면서, 슬래그층을 벗어나는 과정에서 용강이 대기와 접촉하게 되어 나탕 현상이 발생될 수 있다. On the other hand, as the argon gas rises to the upper portion of the molten steel, the molten steel may come into contact with the atmosphere in the process of escaping the slag layer, and a spattering phenomenon may occur.
이와 같이, 용강에 나탕이 발생되는 경우, 용강이 대기와 접촉되어 대기중의 질소가 용강 표면에 흡착 및 혼입되어 제품 결함이 발생되는 문제점이 있다. As described above, when a molten metal is generated in the molten steel, the molten steel is in contact with the atmosphere, and nitrogen in the atmosphere is adsorbed and mixed on the surface of the molten steel, thereby causing product defects.
따라서, 슬래그층에 형성되는 나탕의 크기를 제어하고자, 아르곤 버블링 과정에서 발생하는 진동을 감지하여, 진동의 크기가 일정 수준을 초과하는 경우 아르곤 가스의 공급 유량을 조절함으로써, 슬래그층에 형성되는 나탕의 크기를 제어하고 있다.Accordingly, in order to control the size of the natang formed in the slag layer, the vibration generated in the argon bubbling process is sensed, and when the magnitude of the vibration exceeds a certain level, the supply flow rate of argon gas is adjusted to form the slag layer. I control the size of the natang.
그러나, 종래 아르곤 가스의 공급 유량을 제어하는 것은, 나탕의 크기를 적정 크기 이하로 제한하는 것은 가능하지만, 나탕이 발생을 방지하는 것은 불가능하여 나탕에 의한 용강 재산화가 지속적으로 발생되는 문제점이 있다.However, it is possible to control the supply flow rate of the argon gas in the related art, but it is possible to limit the size of the wort to an appropriate size or less.
본 발명의 일 실시예는, 용강 표면의 슬래그층에서 대기에 개방된 나탕에 의한 용강의 재산화가 발생되는 것을 방지하는 용강 재산화 방지장치를 제공하고자 한다.One embodiment of the present invention, to provide a molten steel property prevention device for preventing the re-oxidation of molten steel caused by hot water open to the atmosphere in the slag layer of the molten steel surface.
본 발명의 일 실시예는, 래들(ladle)에 담겨져 슬래그층이 표면에 형성된 용강의 재산화를 방지하는 장치로서, 래들의 상부에 배치되며 슬래그층에 삽입되도록 래들의 내부에서 승강되는 삽입 블록과, 삽입 블록을 상승 또는 하강시키는 구동부를 포함한다. An embodiment of the present invention is an apparatus for preventing re-oxidation of molten steel formed on a surface of a slag layer contained in a ladle, an insertion block that is disposed above the ladle and is elevated in the ladle to be inserted into the slag layer. , It includes a driving unit for raising or lowering the insertion block.
삽입 블록은, 내화물 재질로 형성될 수 있다. 삽입 블록은 스틸 재질로 형성될 수 있다. 삽입 블록은 냉각기가 설치될 수 있다.The insertion block may be formed of a refractory material. The insert block can be formed of a steel material. The insert block can be equipped with a cooler.
냉각기는, 삽입 블록의 내부에 형성되어 냉각수가 이동되는 냉각 자켓과, 기 냉각 자켓에 냉각수를 공급하는 냉각수 공급부를 포함할 수 있다.The cooler may include a cooling jacket formed inside the insertion block to move the cooling water, and a cooling water supply unit supplying cooling water to the cooling jacket.
구동부는, 삽입 블록의 상측에 돌출되는 커넥터부재와, 커넥터부재에 연결되어 상승 또는 하강 압력을 제공하는 승강기를 포함할 수 있다.The driving unit may include a connector member protruding above the insertion block, and an elevator connected to the connector member to provide an upward or downward pressure.
승강기는 커넥터부재에 로드가 연결된 유압 실린더일 수 있다.The lift may be a hydraulic cylinder having a rod connected to a connector member.
삽입 블록의 저면에는 복수개의 돌출부가 돌출될 수 있다.A plurality of protrusions may protrude on the bottom surface of the insertion block.
본 발명의 일 실시예에 따르면, 래들의 내부에서 아르곤 가스의 공급에 의하여 용강의 교반 작동이 이루어지는 과정에서, 삽입 블록이 슬래그층의 높이를 상승시키도록 삽입되는 바, 아르곤 가스의 기포에 의해 용강의 나탕이 발생되는 것을 방지하여 용강 품질의 향상이 가능하다.According to an embodiment of the present invention, in the process of stirring operation of molten steel by supply of argon gas from the inside of the ladle, the insertion block is inserted to increase the height of the slag layer, the molten steel by air bubbles of argon gas It is possible to improve the quality of molten steel by preventing the occurrence of sprinkling.
도 1은 본 발명의 제1 실시예에 따른 용강 재산화 방지장치가 설치된 상태를 개략적으로 도시한 사시도이다.1 is a perspective view schematically showing a state in which an apparatus for preventing re-oxidation of molten steel according to a first embodiment of the present invention is installed.
도 2는 도 1의 용강 재산화 방지장치의 래들을 개략적으로 도시한 사시도이다.FIG. 2 is a perspective view schematically showing a ladle of the apparatus for preventing re-oxidation of molten steel of FIG. 1.
도 3은 도 2의 래들을 개략적으로 도시한 단면도이다.3 is a cross-sectional view schematically showing the ladle of FIG. 2.
도 4는 본 발명의 제1 실시예에 따른 용강 재산화 방지장치를 개략적으로 도시한 측면도이다.4 is a side view schematically showing an apparatus for preventing re-oxidation of molten steel according to a first embodiment of the present invention.
도 5는 도 4의 삽입 블록이 하강되어 용강 상측의 슬래그층에 삽입된 상태를 개략적으로 도시한 측면도이다. 5 is a side view schematically showing a state in which the insertion block of FIG. 4 is lowered and inserted into the slag layer on the upper side of the molten steel.
도 6은 본 발명의 제2 실시예에 따른 용강 재산화 방지장치의 냉각기가 설치된 삽입 블록을 개략적으로 도시한 요부 단면도이다.6 is a sectional view of the main parts schematically showing an insert block in which a cooler of an apparatus for preventing re-oxidation of molten steel according to a second embodiment of the present invention is installed.
도 7은 본 발명의 제3 실시예에 따른 삽입 블록을 개략적으로 도시한 저면 사시도이다.7 is a bottom perspective view schematically showing an insertion block according to a third embodiment of the present invention.
이하, 첨부한 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein.
도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조부호를 붙였다.In the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are attached to the same or similar elements throughout the specification.
또한, 도면에서 나타난 각 구성의 크기 및 두께는 설명의 편의를 위해 임의로 나타내었으므로, 본 발명이 반드시 도시된 바에 한정되지 않는다.In addition, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is illustrated.
명세서 전체에서, 어떤 부분이 다른 부분과 "연결"되어 있다고 할 때, 이는 "직접적으로 연결"되어 있는 경우뿐 만 아니라, 다른 부재를 사이에 두고 "간접적으로 연결"된 것도 포함한다. 또한, 어떤 부분이 어떤 구성요소를 "포함"한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다. Throughout the specification, when a part is said to be "connected" to another part, this includes not only "directly connected" but also "indirectly connected" with other members therebetween. Also, when a part is said to "include" a certain component, this means that other components may be further included rather than excluding other components, unless otherwise stated.
도 1은 본 발명의 제1 실시예에 따른 용강 재산화 방지장치가 설치된 상태를 개략적으로 도시한 사시도이고, 도 2는 도 1의 용강 재산화 방지장치의 래들을 개략적으로 도시한 사시도이며, 도 3은 도 2의 래들을 개략적으로 도시한 단면도이다.1 is a perspective view schematically showing a state in which a molten steel re-oxidation prevention apparatus according to a first embodiment of the present invention is installed, and FIG. 2 is a perspective view schematically showing a ladle of the molten steel re-oxidation prevention apparatus in FIG. 1, FIG. 3 is a cross-sectional view schematically showing the ladle of FIG. 2.
도 1 내지 도 3에 도시된 바와 같이, 본 발명의 제1 실시예에 따른 용강 재산화 방지장치(100)는, 슬래그층(18)이 표면에 형성되며 래들(10)의 내부로 주입되는 용강(14)의 재산화를 방지하는 장치로서, 래들(10)의 저장 공간(11)의 내부에서 상승 또는 하강되어 슬래그층(18)에 삽입되는 삽입 블록(20)과, 삽입 블록(20)을 상승 또는 하강시키는 구동부(30)를 포함한다.1 to 3, in the molten steel re-oxidation prevention apparatus 100 according to the first embodiment of the present invention, a slag layer 18 is formed on the surface and is injected into the interior of the ladle 10 As an apparatus for preventing re-oxidation of (14), the insertion block 20 and the insertion block 20 inserted into the slag layer 18 are raised or lowered in the storage space 11 of the ladle 10 and inserted therein. It includes a driving unit 30 for raising or lowering.
래들(10)은 전로에서 취련이 완료되어 출강된 용강(14)이 저장되는 저장 공간(11)이 내부에 형성될 수 있다. 즉, 래들(10)은 전로 또는 전기로의 1차 정련로에서 제조된 용강이 내부에 저장되어 주조 공정에 적합한 2차 정련 처리가 이루어질 수 있다. The ladle 10 may be formed with a storage space 11 in which molten steel 14, which has been blown out from the converter, is stored. That is, in the ladle 10, molten steel manufactured in a primary refining furnace of an electric furnace or an electric furnace is stored therein, so that secondary refining treatment suitable for a casting process may be performed.
래들(10)은 원통형의 저장 공간(11)이 내부에 형성되고, 상부에는 용강(14)이 투입되는 개구부(12)가 형성될 수 있다. The ladle 10 may have a cylindrical storage space 11 formed therein, and an opening 12 into which molten steel 14 is introduced may be formed at the top.
이러한 래들(10)에는 가스 공급원(16a)에 연결된 저취 노즐(16)을 통하여 아르곤(Ar) 등의 불활성 가스가 내부에 공급되는 바, 아르곤 가스(16b)의 버블링(bubbling)에 의한 용강의 교반 작용 및 용강에 포함된 비금속 개재물의 부상 및 분리 작용이 이루어질 수 있다. An inert gas such as argon (Ar) is supplied to the ladle 10 through the deodorizing nozzle 16 connected to the gas supply source 16a, and the molten steel by bubbling of the argon gas 16b The stirring action and the floating and separating action of the non-metallic inclusion included in the molten steel may be performed.
이와 같이, 래들(10)의 내부에서는 아르곤 가스(16b)의 공급에 의하여 용강(14)의 교반 작동이 이루어지는 바, 래들(10)의 저장 공간(11)에 투입되는 조제재 및 합금철이 용강(14)에 용이하게 용해되어 용강 성분의 균일화 작용이 이루어질 수 있다. As described above, in the inside of the ladle 10, the stirring operation of the molten steel 14 is performed by the supply of argon gas 16b, and the preparation material and the ferroalloy input to the storage space 11 of the ladle 10 are molten steel ( It can be easily dissolved in 14) can be made to the uniformity of the molten steel component.
또한, 아르곤 가스(16b)의 공급에 의해 발생된 아르곤 기포(16c, 도 5 참조)는 용강의 내부에 존재하는 비금속 개재물에 충돌 및 포집 작용이 이루어져, 비금속 개재물이 슬래그층(18)으로 제거되는 작용이 더욱 촉진될 수 있다.In addition, the argon bubbles (16c, see FIG. 5) generated by the supply of argon gas (16b) is collided and trapped in the non-metallic inclusions present in the molten steel, the non-metallic inclusions are removed to the slag layer 18 The action can be further accelerated.
한편, 래들(10)의 상부에는 삽입 블록(20)이 배치될 수 있다. 보다 구체적으로, 래들(10)의 상부에 위치한 삽입 블록(20)은 개구부(12)를 통해 삽입되어 래들(10)의 내부, 즉 저장 공간(11)에서 상승 또는 하강 가능하게 설치될 수 있다.Meanwhile, the insertion block 20 may be disposed on the upper portion of the ladle 10. More specifically, the insertion block 20 located on the top of the ladle 10 may be inserted through the opening 12 to be installed to be raised or lowered inside the ladle 10, that is, in the storage space 11.
삽입 블록(20)은 아르곤 가스가 용강(14)의 상부로 부상하여 슬래그층(18)을 이탈하는 과정에서, 용강(14)이 대기와 접촉되는 것을 방지하도록 설치될 수 있다. The insertion block 20 may be installed to prevent the molten steel 14 from coming into contact with the atmosphere in the process of leaving the slag layer 18 as argon gas rises to the top of the molten steel 14.
도 4는 본 발명의 제1 실시예에 따른 용강 재산화 방지장치를 개략적으로 도시한 측면도이고, 도 5는 도 4의 삽입 블록이 하강되어 용강 상측의 슬래그층에 삽입된 상태를 개략적으로 도시한 측면도이다. 4 is a side view schematically showing a device for preventing re-oxidation of molten steel according to a first embodiment of the present invention, and FIG. 5 schematically shows a state in which the insertion block of FIG. 4 is lowered and inserted into the slag layer on the upper side of the molten steel. Side view.
도 4 및 도 5에 도시된 바와 같이, 삽입 블록(20)은 래들(10)의 저장 공간(11)의 내부에서 상승 또는 하강 가능하게 설치되는 것으로, 용강(14)의 상부에 형성되는 슬래그층(18)에 삽입될 수 있다.4 and 5, the insertion block 20 is installed to be raised or lowered inside the storage space 11 of the ladle 10, and a slag layer formed on the top of the molten steel 14 (18).
이와 같이, 삽입 블록(20)이 슬래그층(18)의 내부에 삽입되는 것은, 용강(14)의 상측에 형성된 슬래그층(18)의 높이(h, 도 4 참조)를 일시적으로 상승(h', 도 5 참조)시키도록 하여, 용강(14)에서 발생된 아르곤 기포(16c)가 슬래그층(18)을 통과하는 과정에서 용강(14)의 표면이 대기에 노출되는 나탕이 발생되지 않도록 하기 위한 것이다. As described above, when the insertion block 20 is inserted into the slag layer 18, the height (h, see FIG. 4) of the slag layer 18 formed on the upper side of the molten steel 14 is temporarily increased (h' (See FIG. 5), in order to prevent sputtering of the surface of the molten steel 14 from being exposed to the air during the process of passing the slag layer 18 through the argon bubbles 16c generated in the molten steel 14 will be.
따라서, 아르곤 가스(16b)의 공급에 의한 용강(14)의 교반 과정에서, 용강(14)의 표면이 대기에 노출되는 나탕 현상에 의해 대기중의 질소가 용강(14)에 접촉되어 재산화가 발생되는 것을 차단하여, 제품 결함이 발생되는 것을 방지하는 것이 가능하다. Therefore, during the stirring process of the molten steel 14 by supply of argon gas 16b, nitrogen in the atmosphere is brought into contact with the molten steel 14 due to the sputtering phenomenon in which the surface of the molten steel 14 is exposed to the atmosphere, and re-oxidation occurs. It is possible to prevent the product defects from occurring by blocking them.
삽입 블록(20)은 일부분이 슬래그층(18)의 내부로 삽입되는 것도 가능하고, 슬래그층(18)의 높이에 따라 전체가 슬래그층(18)의 내부로 삽입되는 것도 가능하다.The insertion block 20 may be partially inserted into the interior of the slag layer 18, and may be entirely inserted into the interior of the slag layer 18 depending on the height of the slag layer 18.
이러한 삽입 블록(20)은 래들(10)의 저장 공간(11)의 내벽면에 이격된 상태로 상승 또는 하강되는 것으로 저장 공간(11) 보다 작은 직경을 가지는 원통형으로 형성될 수 있다. 그러나 삽입 블록(20)은 원통형으로 반드시 한정되는 것은 아니고, 가장자리의 일부분 또는 전체가 모서리를 갖는 다각형 등으로 적절하게 변경 적용되는 것도 가능하다.The insertion block 20 may be formed into a cylindrical shape having a diameter smaller than that of the storage space 11 as being raised or lowered in a spaced apart state on the inner wall surface of the storage space 11 of the ladle 10. However, the insertion block 20 is not necessarily limited to a cylindrical shape, and may be appropriately changed and applied to a polygon having a corner or a part of the edge.
삽입 블록(20)은 슬래그층(18)에 접촉되는 과정에서 열 손상이 발생되는 것을 방지하도록, 본 실시예에서 내화물 재질로 형성되는 것을 예시적으로 설명한다. 그러나, 삽입 블록(20)은 내화물 재질로 형성되는 것으로 반드시 한정되는 것은 아니고, 용강(14)의 열에 의한 손상이 발생되지 않는 소정의 재질로 적절하게 변경 적용되는 것도 가능하다. The insertion block 20 is exemplarily described as being formed of a refractory material in this embodiment to prevent thermal damage from occurring in the process of contacting the slag layer 18. However, the insertion block 20 is not necessarily limited to being formed of a refractory material, and may be appropriately changed to a predetermined material that does not cause damage due to heat of the molten steel 14.
삽입 블록(20)은 후술하는 구동부(30)의 구동력에 의해 래들(10)의 저장 공간(11)의 내부로 하강되어 슬래그층(18)에 삽입될 수 있다.The insertion block 20 may be lowered into the storage space 11 of the ladle 10 by the driving force of the driving unit 30 which will be described later and inserted into the slag layer 18.
구동부(30)는 삽입 블록(20)에 연결되어 삽입 블록(20)에 상승 또는 하강 구동력을 제공하도록 설치될 수 있다.The driving unit 30 may be installed to be connected to the insertion block 20 to provide an upward or downward driving force to the insertion block 20.
이러한 구동부(30)는, 삽입 블록(20)의 상측에 돌출되는 커넥터부재(31)와, 커넥터부재(31)에 연결되어 상승 또는 하강 압력을 제공하는 승강기(33)를 포함할 수 있다.The driving unit 30 may include a connector member 31 protruding from the upper side of the insertion block 20 and an elevator 33 connected to the connector member 31 to provide an upward or downward pressure.
커넥터부재(31)는 일단은 삽입 블록(20)의 상측에 연결되고 타단은 승강기(33)에 연결될 수 있다.The connector member 31 may have one end connected to the upper side of the insertion block 20 and the other end connected to the elevator 33.
커넥터부재(31)는 삽입 블록(20)의 상측에 원통형의 봉 형상으로 돌출되어, 승강기(33)에 연결될 수 있다. 물론 커넥터부재(31)는 원통형의 봉 형상으로 반드시 한정되는 것은 아니고, 내구성 및 설치 위치를 고려하여 다양한 형상으로 적절하게 변경 적용될 수 있다.The connector member 31 protrudes in the shape of a cylindrical rod on the upper side of the insertion block 20 and can be connected to the elevator 33. Of course, the connector member 31 is not necessarily limited to a cylindrical rod shape, and may be appropriately changed to various shapes in consideration of durability and installation position.
커넥터부재(31)는 삽입 블록(20)과 승강기(33)의 사이에 고정된 상태로 연결되는 것을 예시적으로 설명하지만, 삽입 블록(20) 또는 승강기(33)의 각각 또는 어느 하나에 회전 가능하게 연결되는 것도 가능하다. The connector member 31 is exemplarily described as being connected in a fixed state between the insertion block 20 and the elevator 33, but is rotatable on each or any one of the insertion block 20 or the elevator 33 It is also possible to connect.
승강기(33)는 커넥터부재(31)의 돌출된 단부에 로드(32)가 연결되는 유압 실린더로 적용될 수 있다. 이하에서 승강기와 유압 실리더는 동일 참조 번호를 사용한다. The lift 33 may be applied as a hydraulic cylinder to which the rod 32 is connected to the protruding end of the connector member 31. Hereinafter, the elevator and the hydraulic cylinder use the same reference number.
유압 실린더(33)는 래들(10)이 작업 위치로 이동된 상태에서 아르곤 가스의 취입 작용이 개시된 것으로 확인되면, 삽입 블록(20)이 슬래그층(18)에 삽입되도록 로드(32) 전진(하강) 작동이 이루어질 수 있다. When the hydraulic cylinder 33 confirms that the blowing action of argon gas is started while the ladle 10 is moved to the working position, the rod 32 is advanced (lowered) so that the insertion block 20 is inserted into the slag layer 18. ) Operation can be made.
이러한 유압 실린더(33)는 아르곤 가스의 공급에 의한 용강의 교반 작업이 종료된 것으로 확인되면, 삽입 블록(20)이 슬래그층(18)의 외부로 이탈되도록 로드(32)의 후진(상승) 작동이 이루어질 수 있다.When the hydraulic cylinder 33 confirms that the stirring operation of molten steel by supply of argon gas is ended, the reverse (rising) operation of the rod 32 is performed such that the insertion block 20 is released outside the slag layer 18. This can be done.
전술한 바와 같이, 본 실시예의 용강 재산화 방지장치(100)는, 래들(10)의 내부에서 아르곤 가스의 공급에 의하여 용강(14)의 교반 작동이 이루어지는 과정에서, 삽입 블록(20)이 슬래그층(18)의 높이를 상승시키도록 삽입되는 바, 아르곤 가스의 기포에 의해 용강의 나탕이 발생되는 것을 방지하여 용강(14) 품질의 향상이 가능하다. As described above, in the molten steel re-oxidation prevention apparatus 100 of the present embodiment, in the process of stirring operation of the molten steel 14 by supply of argon gas from the inside of the ladle 10, the insert block 20 is slag Since it is inserted to increase the height of the layer 18, it is possible to improve the quality of the molten steel 14 by preventing generation of molten steel by bubbles of argon gas.
도 6은 본 발명의 제2 실시예에 따른 용강 재산화 방지장치의 냉각기가 설치된 삽입 블록을 개략적으로 도시한 요부 단면도이다. 도 1 내지 도 5와 동일 참조 번호는 동일 또는 유사 기능의 동일 또는 유사부재를 말한다. 이하에서 동일 참조 번호에 대해서는 그 자세한 설명을 생략한다.6 is a sectional view of the main parts schematically showing an insert block in which a cooler of an apparatus for preventing re-oxidation of molten steel according to a second embodiment of the present invention is installed. 1 to 5 and the same reference numbers refer to the same or similar members of the same or similar functions. Hereinafter, detailed description of the same reference numerals will be omitted.
도 6에 도시된 바와 같이, 본 발명의 제2 실시예에 따른 용강 재산화 방지장치의 삽입 블록(120)은 스틸 재질로 형성될 수 있다. 6, the insertion block 120 of the apparatus for preventing re-oxidation of molten steel according to the second embodiment of the present invention may be formed of a steel material.
이러한 삽입 블록(120)에는 슬래그층(18)에 삽입된 상태에서 열 손상을 방지하는 냉각기(130)가 설치될 수 있다.The inserter 120 may be provided with a cooler 130 to prevent thermal damage while being inserted into the slag layer 18.
냉각기(130)는, 삽입 블록(120)의 내부에 형성되어 냉각수가 이동되는 냉각 자켓(131)과, 냉각 자켓(131)에 냉각수를 공급하는 냉각수 공급부(133)를 포함할 수 있다.The cooler 130 may include a cooling jacket 131 formed inside the insertion block 120 to move the cooling water, and a cooling water supply unit 133 supplying cooling water to the cooling jacket 131.
냉각 자켓(131)은 삽입 블록(120)의 내부에 긴 길이로 연장 형성되는 것으로, 냉각수가 이동되는 유로를 형성하여 용강(14)의 고온의 열에 의한 손상이 발생되는 것을 방지할 수 있다. The cooling jacket 131 is formed to be extended to a long length inside the insertion block 120, and forms a flow path through which the cooling water moves, thereby preventing damage due to high temperature heat of the molten steel 14.
냉각수 공급부(133)는 냉각 자켓(131)에 연결되어 냉각수를 공급하는 냉각수 유로(133a)와, 냉각수 유로(133a)에 냉각수를 공급하는 펌핑부(133b)를 포함할 수 있다. The cooling water supply unit 133 may include a cooling water passage 133a connected to the cooling jacket 131 to supply cooling water, and a pumping part 133b supplying cooling water to the cooling water passage 133a.
따라서, 냉각수는 삽입 블록(120)의 내부를 순환하도록 공급되는 바, 삽입 블록(120)이 고온의 열에 의해 손상되지 않도록 내구성을 향상시키는 것이 가능하다. Therefore, since the coolant is supplied to circulate the interior of the insertion block 120, it is possible to improve durability so that the insertion block 120 is not damaged by high temperature heat.
도 7은 본 발명의 제3 실시예에 따른 삽입 블록을 개략적으로 도시한 저면 사시도이다. 도 1 내지 도 6과 동일 참조 번호는 동일 또는 유사 기능의 동일 또는 유사부재를 말한다. 이하에서 동일 참조 번호에 대해서는 그 자세한 설명을 생략한다.7 is a bottom perspective view schematically showing an insertion block according to a third embodiment of the present invention. 1 to 6 and the same reference numerals refer to the same or similar members of the same or similar function. Hereinafter, detailed description of the same reference numerals will be omitted.
도 7에 도시된 바와 같이, 본 발명의 제2 실시예에 따른 용강 재산화 방지장치의 삽입 블록(220)의 저면에는 돌출부(221)가 돌출될 수 있다. As illustrated in FIG. 7, a protrusion 221 may protrude on the bottom surface of the insertion block 220 of the apparatus for preventing re-oxidation of molten steel according to the second embodiment of the present invention.
돌출부(221)는 삽입 블록(20)의 저면에 서로 이격된 복수개로 돌출되는 바, 슬래그층(18)에 삽입되는 과정에서 슬래그층(18)의 높이 상승이 더욱 효과적으로 이루어지는 것이 가능하다. The protrusion 221 protrudes in a plurality of spaced apart from each other on the bottom surface of the insertion block 20, so it is possible to make the height of the slag layer 18 more effectively in the process of being inserted into the slag layer 18.
이상을 통해 본 발명의 바람직한 실시예에 대하여 설명하였지만, 본 발명은 이에 한정되는 것이 아니고 청구범위와 발명의 상세한 설명 및 첨부한 도면의 범위 안에서 여러 가지로 변형하여 실시하는 것이 가능하고 이 또한 본 발명의 범위에 속하는 것은 당연하다.Although preferred embodiments of the present invention have been described through the above, the present invention is not limited thereto, and it is possible to carry out various modifications within the scope of the claims and detailed description of the invention and the accompanying drawings. It is natural to fall within the scope of.
(부호의 설명)(Explanation of codes)
10...래들 11...저장 공간10...Ladle 11...Storage space
12...개구부 14...용강12...Opening part 14...Yonggang
16...저취 노즐 16a..가스 공급원16...odor nozzle 16a..gas supply
16b..아르곤 가스 16c,.아르곤 기포16b..Argon gas 16c,.Argon bubbles
18...슬래그층 20 120, 220...삽입 블록18...Slag layer 20 120, 220...Insert block
30...구동부 31...커넥터부재30...Driving part 31...Connector member
32...로드 33...승강기, 유압 실린더 32...rod 33...lift, hydraulic cylinder
130..냉각기 131..냉각 자켓130.. Cooler 131.. Cooling Jacket
133..냉각수 공급부 133a..냉각수 유로133..Cooling water supply 133a..Cooling water flow path
133b..펌핑부 221..돌출부133b..Pumping section 221..Extrusion section

Claims (7)

  1. 래들(ladle)에 담겨져 슬래그층이 표면에 형성된 용강의 재산화를 방지하는 장치로서, As a device to prevent re-oxidation of molten steel formed on the surface of the slag layer contained in the ladle,
    상기 래들의 상부에 배치되며, 상기 슬래그층에 삽입되도록 상기 래들의 내부에서 승강되는 삽입 블록; 및An insertion block disposed above the ladle and elevating inside the ladle to be inserted into the slag layer; And
    상기 삽입 블록을 상승 또는 하강시키는 구동부;A driving unit for raising or lowering the insertion block;
    를 포함하는 용강 재산화 방지장치.The apparatus for preventing re-oxidation of molten steel comprising a.
  2. 제1항에 있어서,According to claim 1,
    상기 삽입 블록은, 내화물 재질로 형성되는 용강 재산화 방지장치.The insertion block is a device for preventing re-oxidation of molten steel formed of a refractory material.
  3. 제1항에 있어서,According to claim 1,
    상기 삽입 블록은, 스틸 재질로 형성되고 냉각기가 설치되는 용강 재산화 방지장치.The insert block is formed of a steel material, and a device for preventing re-oxidation of molten steel in which a cooler is installed.
  4. 제3항에 있어서,According to claim 3,
    상기 냉각기는, The cooler,
    상기 삽입 블록의 내부에 형성되어 냉각수가 이동되는 냉각 자켓; 및A cooling jacket formed inside the insertion block to move cooling water; And
    상기 냉각 자켓에 냉각수를 공급하는 냉각수 공급부;A cooling water supply unit supplying cooling water to the cooling jacket;
    를 포함하는 용강 재산화 방지장치.The apparatus for preventing re-oxidation of molten steel comprising a.
  5. 제1항에 있어서,According to claim 1,
    상기 구동부는,The driving unit,
    상기 삽입 블록의 상측에 돌출되는 커넥터부재; 및A connector member protruding above the insertion block; And
    상기 커넥터부재에 연결되어 상승 또는 하강 압력을 제공하는 승강기;An elevator connected to the connector member to provide an upward or downward pressure;
    를 포함하는 용강 재산화 방지장치.The apparatus for preventing re-oxidation of molten steel comprising a.
  6. 제5항에 있어서,The method of claim 5,
    상기 승강기는 상기 커넥터부재에 로드가 연결된 유압 실린더인 용강 재산화 방지장치.The elevator is a hydraulic cylinder having a rod connected to the connector member, the apparatus for preventing re-melting of molten steel.
  7. 제1항에 있어서,According to claim 1,
    상기 삽입 블록의 저면에는 복수개의 돌출부가 돌출되는 용강 재산화 방지장치.A device for preventing re-oxidation of molten steel in which a plurality of protrusions protrude on the bottom surface of the insertion block.
PCT/KR2019/014340 2018-11-30 2019-10-29 Apparatus for preventing reoxidation of molten steel WO2020111530A1 (en)

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CN113369470A (en) * 2021-06-11 2021-09-10 马鞍山钢铁股份有限公司 Continuous casting rotary table ladle bottom argon blowing equipment and using method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08120324A (en) * 1994-10-25 1996-05-14 Sumitomo Metal Ind Ltd Apparatus and method for vacuum-refining molten steel
KR20020026029A (en) * 2000-09-30 2002-04-06 이구택 Secondary refining system of stainless steel
JP2009030886A (en) * 2007-07-27 2009-02-12 Jfe Steel Kk Sealing method and device for ladle refining facility
KR101207116B1 (en) * 2010-07-27 2012-12-03 주식회사 포스코 Apparatus for preventing reoxidation of molten steel
KR20170138860A (en) * 2016-06-08 2017-12-18 주식회사 포스코 Molten material processing apparatus and processing method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08120324A (en) * 1994-10-25 1996-05-14 Sumitomo Metal Ind Ltd Apparatus and method for vacuum-refining molten steel
KR20020026029A (en) * 2000-09-30 2002-04-06 이구택 Secondary refining system of stainless steel
JP2009030886A (en) * 2007-07-27 2009-02-12 Jfe Steel Kk Sealing method and device for ladle refining facility
KR101207116B1 (en) * 2010-07-27 2012-12-03 주식회사 포스코 Apparatus for preventing reoxidation of molten steel
KR20170138860A (en) * 2016-06-08 2017-12-18 주식회사 포스코 Molten material processing apparatus and processing method

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