KR20020051480A - Electromagnetic heating apparatus for molten steel in the continuous casting - Google Patents
Electromagnetic heating apparatus for molten steel in the continuous casting Download PDFInfo
- Publication number
- KR20020051480A KR20020051480A KR1020000080554A KR20000080554A KR20020051480A KR 20020051480 A KR20020051480 A KR 20020051480A KR 1020000080554 A KR1020000080554 A KR 1020000080554A KR 20000080554 A KR20000080554 A KR 20000080554A KR 20020051480 A KR20020051480 A KR 20020051480A
- Authority
- KR
- South Korea
- Prior art keywords
- molten steel
- mold
- solenoid coil
- continuous casting
- heating
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- 238000009749 continuous casting Methods 0.000 title claims abstract description 13
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 12
- 230000007547 defect Effects 0.000 abstract description 12
- 239000000843 powder Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 10
- 238000007711 solidification Methods 0.000 abstract description 5
- 230000008023 solidification Effects 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- 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
- B22D11/11—Treating the molten metal
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
본 발명은 연속주조 공정 중 몰드 단변 부분의 용탕면을 완냉각시켜 몰드 파우더의 용융을 촉진시켜 응고 중에 발생하는 코너부 결함을 감소시키는 전자기장을 이용한 연속주조 몰드 내부의 용강 탕면 가열장치에 관한 것이다.The present invention relates to an apparatus for heating molten steel in a continuous casting mold using an electromagnetic field that completely cools a molten surface of a mold short side portion during a continuous casting process to promote melting of the mold powder to reduce corner defects generated during solidification.
일반적으로 연속 주조 공정으로 강을 주조할 경우 주형과 주편 사이에 윤활제인 몰드 파우더(Mold powder)를 원활하게 공급하고, 주편과 주형의융착(Sticking)을 방지하기 위하여 주형 진동을 실시하고 있다.In general, in the case of casting steel in a continuous casting process, a mold powder, which is a lubricant, is smoothly supplied between the mold and the cast steel, and mold vibration is performed to prevent sticking of the cast and the mold.
상기와 같은 공정으로 주조된 주편의 표면에는 주형 진동에 기인한 오실레이션 마크(Oscillation mark), 가로 크랙 및 세로 크랙 등을 비롯한 많은 결함이 발생한다. 특히 코너 부분은 강냉각되는 부분으로 크랙이 빈번하게 발생하여 품질저하와 직결되고 심한 경우 주편 터짐이 발생하여 주조를 중단하게 되는 경우도 있다.Many defects occur on the surface of the cast steel cast as described above, including oscillation marks, transverse cracks and longitudinal cracks due to mold vibration. In particular, the corner portion is a part that is strongly cooled, and cracks frequently occur, which is directly related to deterioration of quality, and in some cases cast casting burst occurs to stop casting.
따라서 용강을 연속 주조할 수 있는 기술이 개발된 이래 주편 표면 품질을 향상시키기 위하여 많은 방법이 제안되었다.Therefore, since the technology for continuous casting of molten steel has been developed, many methods have been proposed to improve the surface quality of cast steel.
종래에는 첫째로, 몰드와 주편간의 윤활성을 향상시키고 몰드 파우더(Mold powder) 소비량을 늘리기 위하여 발열형 몰드 파우더(Mold powder) 등 여러 종류의 몰드 파우더(Mold powder)를 개발하였으나, 표면 결함을 해소시키지는 못하고 오실레이션 마크(Oscillation mark)의 깊이를 약간 줄이는 정도이었다.(일본 재료와 프로세스 5(1992)p.207)Conventionally, in order to improve the lubricity between mold and cast steel and to increase mold powder consumption, various types of mold powders such as heating mold powder have been developed. The oscillation mark was slightly reduced in depth (Japanese Materials and Process 5 (1992) p.207).
둘째로, 주형 진동 방법을 정현파에서 사다리형, 톱니형 등으로 바꾸는 시도도 하였으나, 이 방법 역시 완전하게 주편의 표면 결함을 해소하지는 못하였다.(일본 철과강 71(1985)s p.247)Secondly, attempts were made to change the mold vibration method from sine waves to ladder type and saw tooth type, but this method also did not completely eliminate the surface defects of the cast steel (Japanese Iron and Steel 71 (1985) s p.247).
셋째는, 주형 내 용강 유동을 제어하여 내부 결함을 해소하기 위한 방법으로 주형내 전자교반 장치를 설치하기도 하였으나, 상기와 같은 표면 결함은 해결하지 못하였다.Third, although the electronic stirring apparatus was installed as a method for controlling the flow of molten steel in the mold to solve the internal defects, the surface defects as described above were not solved.
넷째, 상기와 같은 종래의 방법에 의하여 결함을 상당 부분 해소하였으나 몰드 단변부의 결함을 해결하지는 못한 실정으로 더 적극적인 방법이 필요하게 되었으며 이와 같은 요구로 개발된 것이 전자기연속주조 기술이다.Fourth, a more aggressive method is needed in the situation that a large part of the defects have been solved by the conventional method as described above, but the defects in the short sides of the mold have not been solved.
그러나 전자기 주조(Electromagnetic casting; EMC) 기술은 전자기주형 외부에 전자기장을 인가할 수 있는 코일을 설치하여 탕면을 유도가열시키고 전자기압으로 몰드 파우더(Mold powder)가 유입되는 유로를 넓게 확보함으로써 몰드 파우더(Mold powder)가 잘 유입되도록 하여 각종 표면 결함이 해소할 수 있는 기술이나 주형과 주변장치가 복잡하고 설비비가 비싸다는 문제점이 있었다.However, electromagnetic casting (EMC) technology installs a coil that can apply an electromagnetic field to the outside of the electromagnetic mold to induce heating of the hot water surface and secure a wide flow path through which mold powder is introduced by electromagnetic pressure. There was a problem that the mold powder was well introduced, so that various surface defects could be solved, or the mold and the peripheral were complicated and the equipment cost was high.
본 발명은 상기와 같은 종래기술에 있어서의 문제점을 해결하기 위하여 발명된 것으로, 전자기장을 이용하여 연속주조 공정 중 몰드 내 단변 부분의 용탕면을 가열하여 완냉각시키고 몰드 파우더의 용융을 촉진시켜 응고 중에 발생하는 코너부 결함을 감소시키는 전자기장을 이용한 연속주조 몰드 내부의 용강 탕면 가열장치를 제공함을 그 목적으로 한다.The present invention has been invented to solve the problems in the prior art as described above, by heating the molten surface of the short side portion of the mold during the continuous casting process using an electromagnetic field to fully cool and to promote the melting of the mold powder during solidification It is an object of the present invention to provide a molten steel bath heating apparatus inside a continuous casting mold using an electromagnetic field to reduce corner defects generated.
도 1은 본 발명에 따른 몰드 단변부의 종단면도.1 is a longitudinal sectional view of a mold short side portion according to the present invention;
도 2는 본 발명에 따른 몰드 단변부의 횡단면도.2 is a cross-sectional view of a mold short side portion according to the present invention;
〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
1 : 용강2 : 몰드1: molten steel 2: mold
3 : 장변부4 : 단변부3: long side part 4: short side part
5 : 솔레노이드 코일5: solenoid coil
상기의 목적을 달성하기 위한 본 발명의 전자기장을 이용한 연속주조 몰드 내부의 용강 탕면 가열장치는, 연속주조 몰드 내부의 용강의 탕면을 가열시키는 장치에 있어서, 상기 몰드(2)의 단변부(4)측의 용강(1)의 탕면 상부에 설치된 솔레노이드 코일(5)에 주파수가 50 ~ 500,000Hz인 교류전류를 인가하는 것을 특징으로 한다.In the apparatus for heating the molten steel of the molten steel inside the continuous casting mold using the electromagnetic field of the present invention for achieving the above object, the short side portion 4 of the mold 2 is provided. It is characterized by applying an alternating current having a frequency of 50 to 500,000 Hz to the solenoid coil 5 provided on the upper surface of the molten steel 1 on the side.
이하에서는 첨부도면을 참조하여 본 발명에 대하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.
도 1 및 도 2의 본 발명에 따른 몰드 단변부의 종단면도 및 횡단면도에 도시된 바와 같이, 용강(1)을 응고시키기 위한 몰드(2)는 장변부(3)과 단변부(4)로 구성되고, 용강(1)의 탕면 부분을 가열하는 솔레노이드 코일(5)로 구성되어 있다. 그리고 상기 솔레노이드 코일(5)은 몰드 단변부(4)측의 탕면 상부에 설치할 수 있을 정도의 크기로 구성된다.1 and 2, the mold 2 for solidifying the molten steel 1 is composed of a long side portion 3 and a short side portion 4, as shown in the longitudinal and cross-sectional views of the mold short side portion according to the present invention. The solenoid coil 5 which heats the hot water surface part of the molten steel 1 is comprised. In addition, the solenoid coil 5 is configured to a size that can be installed on the upper surface of the hot water on the side of the mold short side (4).
이하에서는 상기와 같이 구성된 본 발명의 작용에 대하여 상세히 설명한다.Hereinafter will be described in detail the operation of the present invention configured as described above.
몰드(2) 내부의 용강(1) 탕면 상부에 솔레노이드 코일(5)로 구성된 전자기장 인가장치를 설치하여 탕면을 가열하면 용탕면이 응고하는 것을 완화시켜 주고 몰드파우더가 잘 용해되는데 기여하게 된다. 따라서 몰드(2)의 코너 부분 주편의 강냉각에 기인한 각종 크랙과 결함 발생을 저감시킬 수 있게 된다.By installing an electromagnetic field applying device composed of a solenoid coil 5 on the molten steel 1 in the mold 2 and heating the molten surface, the molten surface is eased to solidify and contributes to the mold powder dissolving well. Therefore, it becomes possible to reduce the occurrence of various cracks and defects due to the strong cooling of the corner portion of the mold (2).
상기 솔레노이드 코일(5)에 의한 탕면 가열 원리를 설명하면, 솔레노이드 코일(5)에 교류 전류를 인가하면 코일 내부에 자속이 발생하고, 이 자속은 용탕에 유도 전류를 발생시키고, 이 유도 전류에 의해 주울(Joule)열이 발생하게 된다.Referring to the principle of heating the floor surface by the solenoid coil 5, when an alternating current is applied to the solenoid coil 5, magnetic flux is generated inside the coil, and the magnetic flux generates an induction current in the molten metal, Joule heat will be generated.
이 때 인가하는 전류의 주파수는 상용주파수(60Hz)에서 고주파(1MHz)까지 가능하며 전류의 세기는 가열 정도에 따라 결정된다.At this time, the frequency of the current to be applied is available from commercial frequency (60Hz) to high frequency (1MHz) and the strength of the current is determined by the degree of heating.
본 발명의 실시예에 의하면 상용주파수인 50Hz 미만인 경우 전류를 공급하기 위한 전원 공급장치의 제작비가 많이 들고 전자기장에 의한 표피두께(Skin depth)가 커져서 용강에 유동이 발생하여 표면 품질을 저하시킬 수 있으며, 주파수가 500,000Hz를 초과하는 경우 본 발명에 의한 효과를 얻을 수는 있으나 전원 공급장치의 제작비가 많이 들기 때문에 솔레노이드 코일(5)의 주파수는 50 ~ 500,000Hz로하는 것이 바람직하다.According to an exemplary embodiment of the present invention, when the commercial frequency is less than 50 Hz, the manufacturing cost of the power supply device for supplying the current is high and the skin depth is increased due to the electromagnetic field, thereby causing the flow to occur in the molten steel to reduce the surface quality. If the frequency exceeds 500,000 Hz, the effect of the present invention can be obtained, but the manufacturing cost of the power supply is high, so the frequency of the solenoid coil 5 is preferably 50 to 500,000 Hz.
이상에서 상세히 설명한 바와 같이, 본 발명의 전자기장을 이용한 연속주조 몰드 내부의 용강 탕면 가열장치를 사용하면, 전자기장을 이용하여 연속주조 공정 중 몰드 내 단변 부분의 용탕면을 균일하게 가열하여 완냉각시키고 몰드 파우더의 용융을 촉진시킴으로써 용탕면의 응고 중에 발생하는 코너부 결함을 감소시키고 제품의 품질과 생산성을 향상시킬 수 있는 효과가 있게 된다.As described in detail above, when the molten steel heating surface heating apparatus inside the continuous casting mold using the electromagnetic field of the present invention is used, the molten surface of the short side portion of the mold is uniformly heated and completely cooled by using the electromagnetic field. By promoting the melting of the powder, it is possible to reduce corner defects occurring during solidification of the molten surface and to improve product quality and productivity.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000080554A KR20020051480A (en) | 2000-12-22 | 2000-12-22 | Electromagnetic heating apparatus for molten steel in the continuous casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000080554A KR20020051480A (en) | 2000-12-22 | 2000-12-22 | Electromagnetic heating apparatus for molten steel in the continuous casting |
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| Publication Number | Publication Date |
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| KR20020051480A true KR20020051480A (en) | 2002-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020000080554A KR20020051480A (en) | 2000-12-22 | 2000-12-22 | Electromagnetic heating apparatus for molten steel in the continuous casting |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07256413A (en) * | 1994-03-22 | 1995-10-09 | Nippon Steel Corp | Apparatus and method for continuous casting of molten metal |
| JPH08252658A (en) * | 1995-03-16 | 1996-10-01 | Nkk Corp | High frequency coil for continuous casting and continuous casting method |
| JPH10193045A (en) * | 1997-01-08 | 1998-07-28 | Nippon Steel Corp | Continuous casting method and continuous casting apparatus for molten metal |
-
2000
- 2000-12-22 KR KR1020000080554A patent/KR20020051480A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07256413A (en) * | 1994-03-22 | 1995-10-09 | Nippon Steel Corp | Apparatus and method for continuous casting of molten metal |
| JPH08252658A (en) * | 1995-03-16 | 1996-10-01 | Nkk Corp | High frequency coil for continuous casting and continuous casting method |
| JPH10193045A (en) * | 1997-01-08 | 1998-07-28 | Nippon Steel Corp | Continuous casting method and continuous casting apparatus for molten metal |
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