JPH0289544A - Method for controlling molten steel flow in mold in continuous casting - Google Patents
Method for controlling molten steel flow in mold in continuous castingInfo
- Publication number
- JPH0289544A JPH0289544A JP23986288A JP23986288A JPH0289544A JP H0289544 A JPH0289544 A JP H0289544A JP 23986288 A JP23986288 A JP 23986288A JP 23986288 A JP23986288 A JP 23986288A JP H0289544 A JPH0289544 A JP H0289544A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- mold
- electromagnetic force
- flow
- left sides
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 238000009749 continuous casting Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 7
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000007654 immersion Methods 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 abstract description 10
- 238000007599 discharging Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- 238000005188 flotation Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、鋼の連続鋳造における、電磁力を応用した連
続鋳造用鋳型内溶鋼流動制御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for controlling the flow of molten steel in a mold for continuous casting using electromagnetic force in continuous casting of steel.
従来の技術
連続鋳造法は、取鍋等の容器から、タンデイツシュ内へ
溶鋼を装入し、該溶鋼をタンデイツシュに取り付けた浸
漬ノズルを介し、吐出口から鋳型内へ注入し、鋳型の下
部から連続的に鋳片として引き抜くものである。The conventional continuous casting method involves charging molten steel into a tundish from a container such as a ladle, injecting the molten steel into the mold from a discharge port through a submerged nozzle attached to the tundish, and casting the molten steel continuously from the bottom of the mold. It is extracted as cast slabs.
この際に、ノズルから出る溶鋼噴流により形成される鋳
型内溶鋼流動が、パウダー巻き込みゃ介在物浮上性、ひ
いては製造される鋳片の品質に多大の影響を与えること
、特に、弯曲型連続鋳造機においては、介在物が鋳型内
へ持ち込まれると浮上しにくく、スラブの円弧内面側に
捕捉、集積し、製品品質劣化の原因となる。At this time, it is important to note that the flow of molten steel in the mold, which is formed by the molten steel jet coming out of the nozzle, has a great effect on the levitation of inclusions and the quality of the manufactured slabs if the powder is entrained, especially in curved continuous casting machines. When inclusions are brought into the mold, they are difficult to float and are trapped and accumulated on the arcuate inner surface of the slab, causing product quality deterioration.
そこで、従来はパウダーを巻き込まないようにするため
と、鋳型内に入った介在物の浮上を促進して介在物が凝
固シェルに捕捉されないようにするために、特開昭８２
−１３７１５３号公報に示すように、各連続鋳造機の操
業条件に適合した形状の逆Ｙ２孔型の浸漬ノズルを使用
することが一般的であった。Therefore, in order to prevent the powder from being drawn in, and to promote the floating of the inclusions that have entered the mold so that the inclusions are not captured by the solidified shell, conventional techniques have been developed in Japanese Patent Laid-Open No. 82
As shown in Japanese Patent No. 137153, it has been common to use an inverted Y2 hole type immersion nozzle that is shaped to suit the operating conditions of each continuous casting machine.
しかし、近年の生産性向上の観点から鋳造速度を、より
高速化する状況下においては、パウダー巻き込み防止と
介在物浮上性確保を両立させる浸漬ノズル形状を選定す
ることは非常に困難である。However, in recent years, as casting speeds have been increasing from the perspective of improving productivity, it has become extremely difficult to select a immersion nozzle shape that both prevents powder entrainment and ensures inclusion flotation.
この対策としては、第２図に示すように鋳型４内の浸漬
ノズル１からの溶鋼流３へ、外部から電磁力１０を印加
することによって、該溶鋼流そのものを、減衰させるこ
とによって、高速鋳造下においても、パウダー巻き込み
防止と介在物浮上促進を図る技術が特開昭５７−１７３
５８号公報に示されている。As a countermeasure against this problem, as shown in Fig. 2, an electromagnetic force 10 is applied from the outside to the molten steel flow 3 from the immersion nozzle 1 in the mold 4 to attenuate the molten steel flow itself, thereby achieving high-speed casting. Also, the technology for preventing powder entrainment and promoting the floating of inclusions was developed in Japanese Patent Application Laid-Open No. 57-173.
It is shown in Publication No. 58.
一方、浸漬ノズル上部に設けられた溶鋼流量制御装置で
あるスライディングノズルの開度状況や、浸漬ノズル１
の詰まり、または溶損状況によって、浸漬ノズルｌの左
右の吐出口２から吐出される溶鋼流速は必ずしも同一で
はない。On the other hand, the opening status of the sliding nozzle, which is a molten steel flow control device installed at the top of the immersion nozzle, and the immersion nozzle 1
The flow velocity of the molten steel discharged from the left and right discharge ports 2 of the immersion nozzle l is not necessarily the same depending on the clogging or melting condition.
従って、この左右の吐出流速に合わせて、各々の吐出流
に作用させる電磁場の強さを調整する必要があるが、現
在の電磁力印加装置では、第２図に示すように、左右の
吐出流に作用する電磁力１０は同一であるため、左右の
吐出流速に合った電磁力に正確に調整することは不可能
であった。Therefore, it is necessary to adjust the strength of the electromagnetic field that acts on each discharge flow according to the left and right discharge flow velocities, but with the current electromagnetic force application device, as shown in Figure 2, Since the electromagnetic force 10 acting on both sides is the same, it has been impossible to accurately adjust the electromagnetic force to match the left and right discharge flow velocities.
発明が解決しようとする課題
本発明は、従来技術の上記問題点を解消するもので、種
々鋳造条件下においてもパウダー巻き込みを防止しつつ
、介在物浮上性を促進することによって、介在物の少な
い高清浄度鋼を安定に歩留りよく製造することを目的と
する。Problems to be Solved by the Invention The present invention solves the above-mentioned problems of the prior art, and reduces the amount of inclusions by promoting inclusion flotation while preventing powder entrainment under various casting conditions. The purpose is to produce high-cleanliness steel stably and with good yield.
課題を解決するための手段
本発明は、上記課題を有利に解決するためになされたも
ので、その要旨とするところは、溶湯容器から浸漬ノズ
ルを介して鋳型内に溶鋼を注入する連続鋳造において、
浸漬ノズルからの溶湯流に、その逆方向に電磁力を付与
する電磁力付与装置を浸漬ノズルに隣接して鋳型の左右
に各１台設置し、かつその付与すべき電磁力を鋳造状況
に応じて左右独立に設定することを特徴とする連続鋳造
における鋳型内溶鋼流動制御方法である。Means for Solving the Problems The present invention has been made to advantageously solve the above problems, and its gist is to provide a method for continuous casting in which molten steel is injected into a mold from a molten metal container through an immersion nozzle. ,
An electromagnetic force applying device that applies electromagnetic force in the opposite direction to the molten metal flow from the immersion nozzle is installed on each side of the mold adjacent to the immersion nozzle, and the electromagnetic force to be applied is applied according to the casting situation. This is a method for controlling the flow of molten steel in a mold in continuous casting, which is characterized in that the left and right sides are set independently.
作用 以下、図面に基づき本発明の作用を詳細に説明する。action Hereinafter, the operation of the present invention will be explained in detail based on the drawings.
一般的な２孔型の浸漬ノズルｌを用いた場合の連続鋳造
機においては、溶鋼流量調整用のキスライディングノズ
ルでの流れの乱れ、および浸漬ノズル内部または吐出口
近傍での詰まり等により、第３図（ａ）に示すように、
左右の吐出口２から吐出される溶鋼流速、３ａ、 ３ｂ
は必ずしも等しくなく、その結果、鋳型４内に形成され
る湯流れは左右対称でない状態、つまり、偏流を形成し
、溶鋼流速が大きい場合上昇流３ａｌが強くなり、パウ
ダー５巻き込みが発生しやすく、かつ、下降流３ａ２も
強くなり浸透深さも深くなるので、介在物の浮上性も悪
化する。In a continuous casting machine that uses a typical two-hole type immersion nozzle, problems such as flow disturbance in the sliding nozzle for adjusting the flow rate of molten steel and clogging inside the immersion nozzle or near the discharge port may occur. As shown in Figure 3(a),
Flow velocity of molten steel discharged from left and right discharge ports 2, 3a, 3b
are not necessarily equal, and as a result, the molten metal flow formed in the mold 4 is not symmetrical, that is, it forms a biased flow, and when the molten steel flow velocity is high, the upward flow 3al becomes strong, and powder 5 entrainment is likely to occur. In addition, since the downward flow 3a2 becomes stronger and the penetration depth becomes deeper, the floatability of inclusions also deteriorates.
これに対し、第２図に示すように、鋳型４の周囲に、コ
イル８とヨーク７で構成された電磁石を設置し、浸漬ノ
ズル１からの溶鋼吐出流３へ制動力１０を作用させる既
存技術がある。しかし、この技術においては、浸漬ノズ
ル１の左右で発生する電磁力ｌＯは同一であるため、吐
出流速の大きい側では、浸漬ノズル吐出流３ａへ作用す
る制動力１０が不充分で、第３図（ｂ）に示すように、
メニスカス部での上昇流３ａｌは若干弱化するが、パウ
ダー５巻込みは完全には防止できない、一方、吐出流速
の小さい側では、作用する制動力１０が大きすぎるため
、吐出流３ｂは上下に分岐３ｂ、 、 ３ｂ２され、浸
漬ノズル１周辺での湯わきが発生し、パウダー５巻込み
の原因となる。In contrast, as shown in FIG. 2, the existing technology installs an electromagnet composed of a coil 8 and a yoke 7 around the mold 4, and applies a braking force 10 to the molten steel discharge flow 3 from the immersion nozzle 1. There is. However, in this technique, since the electromagnetic force lO generated on the left and right sides of the submerged nozzle 1 is the same, the braking force 10 acting on the submerged nozzle discharge flow 3a is insufficient on the side where the discharge flow velocity is high, as shown in FIG. As shown in (b),
Although the upward flow 3al at the meniscus section is slightly weakened, the entrainment of powder 5 cannot be completely prevented.On the other hand, on the side where the discharge flow velocity is small, the braking force 10 that acts is too large, so the discharge flow 3b is divided into upper and lower directions. 3b, , 3b2, and bubbling occurs around the immersion nozzle 1, causing the powder 5 to become entangled.
従って偏流の発生している条件下で、従来の方法では理
想的な湯流れに制御することはできない。Therefore, under conditions where drifting occurs, it is not possible to control the flow to an ideal level using conventional methods.
これに対し、第１図に示すように本発明の場合には、鋳
型４の外側に、コイル８とヨーク７で構成されたコの字
型の電磁石を浸漬ノズルｌに隣接して左右別々に設置し
、各々の電磁石を独立に設定する。On the other hand, in the case of the present invention, as shown in FIG. and set each electromagnet independently.
従って、第３（ｃ）図に示すように、吐出口２からの溶
鋼流速の大きな左側のコイル８には、その流れを減衰す
るのに充分な電磁力１０を印加し、吐出溶鋼流速の小さ
い右側のコイルには、やや弱く電磁力ｌＯを印加するこ
とによって、結果的には左右の流動とも理想的な状態に
維持できる。Therefore, as shown in FIG. 3(c), an electromagnetic force 10 sufficient to attenuate the flow is applied to the coil 8 on the left side, where the flow rate of molten steel from the discharge port 2 is high, and By applying a slightly weaker electromagnetic force lO to the right coil, it is possible to maintain both the left and right flows in an ideal state.
ここに電磁力付与装置の容量は鋳造設備毎に適宜決定す
れば良く、本発明においては特に限定されるものでない
、なお、電磁力の印加が適正な状態になっているかどう
かの判定は第３図に示すように、鋳型湯面上に４ケの溶
鋼湯面レベルセンサー６を設置し、この湯面レベルセン
サー６によって、左右各々の鋳型短辺近傍と浸漬ノズル
近傍の溶鋼湯面レベルを同時に測定することによって監
視できる。Here, the capacity of the electromagnetic force applying device may be appropriately determined for each casting equipment, and is not particularly limited in the present invention.It should be noted that whether or not the application of electromagnetic force is in an appropriate state is determined in the third step. As shown in the figure, four molten steel level sensors 6 are installed above the mold surface, and these molten steel level sensors 6 simultaneously measure the molten steel level near the short sides of the left and right molds and near the immersion nozzle. Can be monitored by measuring.
実施例
鋳造スラブ［ＩＥｌｏｏｍｍｗ、スラブ厚み２４５ｍｍ
ｔのスラブを鋳造速度１．８５１１層ｉｎで鋳造する
上で、４００１鵬Ｘ４００ｍｍの断面積を有するコイル
２個と２つのコイルを連結するヨーク１つからなるコの
字型の電磁石を鋳型の左右に、各々設置し、左右各々で
３０００ＧａｕＳｓの磁場が発生するように制御した第
１図に示す鋳型を使用し、７０φの吐出口を有する２孔
Ｙ型浸漬ノズル１を介して鋳造したところ、左側の湯面
レベルセンサー６による湯面レベルは目標値を維持でき
ていたが、右側の湯面レベルセンサー６では、浸漬ノズ
ル１近傍で異常な溶鋼盛り上がりが検出された。Example casting slab [IEloommw, slab thickness 245mm
When casting a slab of 1.85 mm at a casting speed of 1.8511 layers, U-shaped electromagnets consisting of two coils with a cross-sectional area of 400 mm x 400 mm and a yoke connecting the two coils are placed on the left and right sides of the mold. Using the mold shown in Fig. 1, which was installed on each side and controlled to generate a magnetic field of 3000 GauSs on each side, casting was performed through a two-hole Y-type immersion nozzle 1 with a 70φ discharge port. Although the hot water level measured by the hot water level sensor 6 was able to maintain the target value, the hot water level sensor 6 on the right side detected an abnormal bulge of molten steel near the immersion nozzle 1.
次に右側のコイル８のみ、３０００Ｇａｕｓｓから２０
００Ｇａｕｓｓになるように設定を変更したところ、右
側の湯面レベルも目標どおり同一レベルを維持できるよ
うになった。Next, only coil 8 on the right side, from 3000 Gauss to 20
After changing the settings to 00 Gauss, the water level on the right side was able to maintain the same level as desired.
また鋳造された成品の品質レベルを調査したところ、左
右とも３０００Ｇａｕｓｓの同一レベルの磁場を印加し
たところでは、ところどころで介在物系の欠陥が検出さ
れたものの、湯面レベルが全体的に平滑になるように、
左右の印加電磁場を独立に設定したところでは、介在物
系欠陥は検出されず、非常に良好な成品が得られた。In addition, when we investigated the quality level of the cast product, we found that when the same level of magnetic field of 3000 Gauss was applied to both the left and right sides, inclusion-based defects were detected here and there, but the level of the molten metal was smooth overall. like,
When the left and right applied electromagnetic fields were set independently, no inclusion defects were detected and a very good product was obtained.
発明の詳細
な説明したように、本発明を用いれば鋳型内の溶鋼流動
を理想的な状態に維持できるため、いかなる鋳造条件下
においても、パウダー巻込みを防止しつつ介在物浮上性
を促進することによって、介在物の少ない高清浄度鋼を
安定に、歩留りよく製造することができる。As described in detail, the present invention allows the flow of molten steel in the mold to be maintained in an ideal state, thereby promoting inclusion flotation while preventing powder entrainment under any casting conditions. By doing so, high-cleanliness steel with few inclusions can be stably manufactured with a high yield.
第１図は本発明の実施例を示す＃ＰＪ型平面説明図、第
２図は従来技術を示す鋳型平面説明図、第３図（ａ）
、 （ｂ） 、 （ｃ）は本発明の作用を示す説明図で
ある。
１ｅａ・浸漬ノズル、２・・・吐出口、３１１・・吐出
溶鋼硫、４争・・鋳型、５・・・モールドパラター、６
・・・湯面レベルセンサー、７・・争ヨーク、８・Φ・
コイル、９・舎・磁場、１０・・・電磁制動力。
第１図Fig. 1 is an explanatory plan view of #PJ type showing an embodiment of the present invention, Fig. 2 is an explanatory plan view of a mold showing a conventional technique, and Fig. 3 (a)
, (b) and (c) are explanatory diagrams showing the effect of the present invention. 1ea・Immersion nozzle, 2・Discharge port, 311・Discharge molten steel sulfur, 4・Mold, 5・Mold parameter, 6
...Hot water level sensor, 7..War yoke, 8.Φ.
Coil, 9. Magnetic field, 10... Electromagnetic braking force. Figure 1
Claims (1)
る連続鋳造において、浸漬ノズルからの溶湯流にその逆
方向に電磁力を付与する電磁力付与装置を、浸漬ノズル
に隣接して鋳型の左右に各１台設置し、かつその付与す
べき電磁力を、鋳造条件に応じて左右独立に設定するこ
とを特徴とする連続鋳造における鋳型内溶鋼流動制御方
法。In continuous casting, in which molten steel is injected from a molten metal container into a mold through an immersion nozzle, electromagnetic force applying devices that apply electromagnetic force in the opposite direction to the molten metal flow from the immersion nozzle are placed adjacent to the immersion nozzle on the left and right sides of the mold. A method for controlling the flow of molten steel in a mold in continuous casting, characterized in that one unit is installed in each of the molds, and the electromagnetic force to be applied is set independently on the left and right sides according to casting conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23986288A JPH0289544A (en) | 1988-09-27 | 1988-09-27 | Method for controlling molten steel flow in mold in continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23986288A JPH0289544A (en) | 1988-09-27 | 1988-09-27 | Method for controlling molten steel flow in mold in continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0289544A true JPH0289544A (en) | 1990-03-29 |
Family
ID=17050989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23986288A Pending JPH0289544A (en) | 1988-09-27 | 1988-09-27 | Method for controlling molten steel flow in mold in continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0289544A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02303663A (en) * | 1989-05-16 | 1990-12-17 | Sumitomo Metal Ind Ltd | Method for controlling molten steel surface level in mold |
| US7320356B2 (en) * | 2001-01-10 | 2008-01-22 | Abb Ab | Electromagnetic brake |
| KR101277701B1 (en) * | 2011-06-29 | 2013-06-21 | 현대제철 주식회사 | Device for controlling level of molten steel in mold and method therefor |
| JP2020108898A (en) * | 2019-01-07 | 2020-07-16 | 日本製鉄株式会社 | Continuous casting machine |
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1988
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| JPS5976647A (en) * | 1982-10-22 | 1984-05-01 | Kawasaki Steel Corp | Method and device for stirring molten metal for casting in continuous casting |
| JPS6152969A (en) * | 1984-08-22 | 1986-03-15 | Nippon Kokan Kk <Nkk> | Electromagnetic stirrer for continuous casting molten steel |
| JPS6188952A (en) * | 1984-10-05 | 1986-05-07 | Kawasaki Steel Corp | Method for adding alloy component to mold inside in continuous casting |
| JPS62252649A (en) * | 1986-04-25 | 1987-11-04 | Nippon Steel Corp | Divagating flow control method in mold for molten steel continuous casting |
| JPS62254954A (en) * | 1986-04-30 | 1987-11-06 | Kawasaki Steel Corp | Control method for molten steel flow in mold of continuous casting |
| JPS6316841A (en) * | 1986-07-10 | 1988-01-23 | Nippon Kokan Kk <Nkk> | Control method for molten surface fluctuation in continuous casting |
| JPS63212051A (en) * | 1987-02-27 | 1988-09-05 | Nkk Corp | Method for controlling variation of molten metal surface in continuous casting |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02303663A (en) * | 1989-05-16 | 1990-12-17 | Sumitomo Metal Ind Ltd | Method for controlling molten steel surface level in mold |
| US7320356B2 (en) * | 2001-01-10 | 2008-01-22 | Abb Ab | Electromagnetic brake |
| KR101277701B1 (en) * | 2011-06-29 | 2013-06-21 | 현대제철 주식회사 | Device for controlling level of molten steel in mold and method therefor |
| JP2020108898A (en) * | 2019-01-07 | 2020-07-16 | 日本製鉄株式会社 | Continuous casting machine |
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