JPH02303663A - Method for controlling molten steel surface level in mold - Google Patents
Method for controlling molten steel surface level in moldInfo
- Publication number
- JPH02303663A JPH02303663A JP12258889A JP12258889A JPH02303663A JP H02303663 A JPH02303663 A JP H02303663A JP 12258889 A JP12258889 A JP 12258889A JP 12258889 A JP12258889 A JP 12258889A JP H02303663 A JPH02303663 A JP H02303663A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- surface level
- mold
- level
- molten
- 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 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 15
- 238000007654 immersion Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000008961 swelling Effects 0.000 description 8
- 238000005266 casting Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 5
- 238000012733 comparative method Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 206010041052 Sluggishness Diseases 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001055 chewing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は連続鋳造における鋳型内溶鋼の湯面レベルの
制御方法、詳しくは鋳型内溶鋼湯面レベルを適正に制御
して、内部欠陥や表面疵のない鋳片を製造する鋳型内溶
鋼の湯面レベル制御方法に関する。Detailed Description of the Invention (Field of Industrial Application) This invention relates to a method for controlling the level of molten steel in a mold in continuous casting, and more specifically, to properly control the level of molten steel in the mold to prevent internal defects and surface The present invention relates to a method for controlling the level of molten steel in a mold to produce slabs without defects.
（従来の技術）
連続鋳造法によりスラブを製造する場合、ノズル下部に
２つの吐出口を有する浸漬ノズルが用いられる。鋳造中
に溶鋼温度が低下してノズル内にアルミナや地金などが
付着すると、左右の吐出流が不均一となって偏流が生じ
るため、湯面レベルが大きく変動する。その結果、パウ
ダーが溶鋼中に巻きこまれたり、凝固シェルに取りこま
れたりして鋳片に内部欠陥や表面疵が発生する。(Prior Art) When manufacturing a slab by a continuous casting method, a submerged nozzle having two discharge ports at the bottom of the nozzle is used. If the temperature of the molten steel drops during casting and alumina or base metal adheres to the inside of the nozzle, the left and right discharge flows become uneven, causing drift, and the molten metal level fluctuates greatly. As a result, the powder is engulfed in the molten steel or incorporated into the solidified shell, causing internal defects and surface flaws in the slab.
そこで鋳型内溶鋼の偏流をなくすため、下記のような浸
漬ノズルや湯面レベル制御方法が種々提案されている。Therefore, in order to eliminate the drift of molten steel in the mold, various immersion nozzles and molten metal level control methods as described below have been proposed.
■アルミナや地金が付着しにくいようにノズルの材質を
ＺＧ（ジルコニアグラファイト） −Ｃａ Ｏ−Ｓ ｉ
Ｏｘ系にしたノズル（鉄と鋼、１９８７−５９９７
） 、■アルミナ等が付着しないように吐出口の形状と
吐出角度に改良を加えた浸漬ノズル（鉄と鋼、１９８５
−Ｓ１０３８） 、■浸漬ノズルの両側にセンサーを設
置して湯面レベルを測定し、その変動量の大きい方の値
に基づいて湯面レベルを制御する方法（ＣＡＭＰ−Ｉ
Ｓ Ｉ Ｊ、 Ｖｏｌ、（１９８８）−１２６３） 、
などである。■The material of the nozzle is ZG (zirconia graphite) -Ca O-S i to prevent alumina and base metal from adhering to it.
Ox-based nozzle (Tetsu to Hagane, 1987-5997
), ■Immersion nozzle with improved discharge port shape and discharge angle to prevent alumina from adhering (Tetsu to Hagane, 1985)
-S1038), ■Measure the hot water level by installing sensors on both sides of the immersion nozzle, and control the hot water level based on the value with the larger amount of variation (CAMP-I
S I J, Vol, (1988)-1263),
etc.
しかし上記■〜■においてはつぎのような問題があり、
溶鋼の偏流を完全に防止することはできない、すなわち
、■の材質変更したノズルでは、アルミナ等の付着は軽
減するが低炭素アルミキルド鋼の場合には依然として付
着する。■の形状を改良したノズルでは、鋳込みはじめ
の付着は減少するが長期間使用すると付着が起こる。■
の方法では片側のレベル測定値だけにもとづいて制御す
るので精度が悪い。However, in the above ■～■, there are the following problems.
It is not possible to completely prevent drifting of molten steel; in other words, with the nozzle in which the material is changed in (2), the adhesion of alumina, etc. is reduced, but in the case of low carbon aluminium-killed steel, adhesion still occurs. With the nozzle with improved shape (2), adhesion at the beginning of casting is reduced, but adhesion occurs after long-term use. ■
In this method, the accuracy is poor because control is based only on the level measurement value on one side.
（発明が解決しようとする課題）
この発明の目的は、連続鋳造中に湯面レベルに差異が生
じてパウダーが溶鋼中に巻き込まれ、鋳片内部や表面に
欠陥が発生するのを防止する溶鋼湯面レベルの制御方法
を提供することにある。(Problems to be Solved by the Invention) The purpose of the present invention is to prevent the occurrence of defects in the inside and surface of the slab by preventing powder from being rolled into the molten steel due to differences in the level of the molten steel during continuous casting. The object of the present invention is to provide a method for controlling the hot water level.
（課題を解決するための手段）
スラブ鋳造中の鋳型内溶鋼に偏流が起こって湯面レベル
に差異が生じ、パウダーが溶鋼中に巻きこまれることは
よく知られている。(Means for Solving the Problems) It is well known that drifting occurs in the molten steel in the mold during slab casting, causing a difference in the level of the molten metal and causing powder to be engulfed in the molten steel.
そこで本発明者らは溶鋼の偏流防止について検討を重ね
た結果、浸漬ノズルの右側と左側の湯面レベルを測定し
、その値にもとづいて電磁コイルにより溶鋼流を制御す
るならば、偏流を容易に解消でき、引いては湯面レベル
差をなくすことができるとの知見を得、この発明を完成
した。Therefore, the inventors of the present invention have repeatedly studied ways to prevent drifting of molten steel, and found that if the molten metal level on the right and left side of the immersion nozzle is measured and the molten steel flow is controlled by an electromagnetic coil based on the measured values, drifting of molten steel can be easily prevented. This invention was completed based on the knowledge that it was possible to solve this problem and, in turn, eliminate the difference in hot water level.
すなわち本発明の要旨は「鋳型内溶鋼に浸漬したノズル
を挟んで一対の湯面レベル計と電磁コイルを設け、この
レベル計により湯面レベルを測定し、その測定値にもと
づいて前記電磁コイルをそれぞれ独立して作動させ、湯
面レベルを制御する鋳型内溶鋼の湯面レベル制御方法」
にある。In other words, the gist of the present invention is to provide a pair of molten metal level meter and an electromagnetic coil with a nozzle immersed in molten steel in the mold in between, measure the molten metal level with this level meter, and adjust the electromagnetic coil based on the measured value. A method for controlling the level of molten steel in a mold by operating each independently to control the level of the molten steel.
It is in.
（作用）
以下、本発明の鋳型内溶鋼の湯面レベル制御方法を図面
を用いて説明する。第１図は本発明の方法を実施する連
続鋳造用鋳型の長辺方向の概略断面図、第２図はその鋳
型の平面図である。第１図及び第２図において、ｌは鋳
型、２は浸漬ノズル、２ａ及び２ｂは吐出口、３は溶鋼
、４ａ及び４ｂは湯面レベル計（例えば、渦流型レベル
計）、５ａ及び５ｂはｉｔ電磁コイルある。(Function) Hereinafter, the method for controlling the level of molten steel in a mold according to the present invention will be explained with reference to the drawings. FIG. 1 is a schematic sectional view in the long side direction of a continuous casting mold for carrying out the method of the present invention, and FIG. 2 is a plan view of the mold. In Figures 1 and 2, l is a mold, 2 is an immersion nozzle, 2a and 2b are discharge ports, 3 is molten steel, 4a and 4b are surface level meters (for example, eddy current level meters), and 5a and 5b are It has an electromagnetic coil.
このような装置によって湯面レベルを制御するには、浸
漬ノズル２の左側に設置された湯面レベル計４８により
左側の溶鋼盛り上がり量Ｈａを、右側レベル計４ｂによ
って右側の盛り上がり量Ｈｂを測定する。鋳造中は連続
して湯面レベルの測定を続け、ＨａとＨｂとが等しい場
合、すなわち偏流が生じていない場合には電磁コイル５
ａ及び５ｂには印加しないか、または両側の盛り上がり
量が共に大きすぎる場合には両方の電磁コイルに同等の
印加を行い溶鋼流速を低下させる。どちらか一方の吐出
口にアルミナ等が付着して溶鋼吐出速度ｐ（低下すると
、他方の吐出流速が増してその側の盛り上がり量が増大
する。たとえば吐出口２ａにアルミナが付着して口径が
狭くなると、その吐出量Ｖａが減少して盛り上がり量Ｈ
ａは低くなる。一方、反対側の吐出口２ｂからの吐出量
ｖｂは増大し、盛り上がり量Ｈｂは高くなる。盛り上が
り量ＨａとＨｂは湯面レベル計４ａ及び４ｈにより測定
されているから、その差に見合う磁場を生じるように電
磁コイル５ｂに印加すれば吐出速度ｖｂは低減され、そ
の差は解消される。To control the molten metal level with such a device, the molten steel swell amount Ha on the left side is measured by the molten steel level meter 48 installed on the left side of the immersion nozzle 2, and the swell amount Hb on the right side is measured by the right side level meter 4b. . During casting, the level of the molten metal is continuously measured, and when Ha and Hb are equal, that is, when no drift occurs, the electromagnetic coil 5
If no voltage is applied to a and 5b, or if the amount of swelling on both sides is too large, the same voltage is applied to both electromagnetic coils to reduce the molten steel flow rate. When alumina or the like adheres to one of the discharge ports and the molten steel discharge speed p decreases, the discharge flow velocity of the other side increases and the amount of swelling on that side increases. For example, alumina adheres to the discharge port 2a and the diameter becomes narrow. Then, the discharge amount Va decreases and the swelling amount H
a becomes lower. On the other hand, the discharge amount vb from the discharge port 2b on the opposite side increases, and the swelling amount Hb becomes high. Since the heaving amounts Ha and Hb are measured by the hot water level meters 4a and 4h, if a magnetic field corresponding to the difference is applied to the electromagnetic coil 5b, the discharge speed vb is reduced and the difference is eliminated.
ところで磁場の強さと溶鋼の盛り上がり量とは下記（１
）式の関係にある。By the way, the strength of the magnetic field and the amount of swelling of molten steel are as follows (1
) is related to the equation.
Ｂ−に−Ｈ” −−−（１）ここに
、Ｂは磁場の強さく１東回度）、Ｈは盛り上がり量、Ｋ
は定数、である。B-to-H” ---(1) Here, B is the strength of the magnetic field (1 degree), H is the amount of swelling, and K
is a constant.
したがって第１図（ａ）のように、溶鋼盛り上がり量が
Ｈａ及びＨｂの場合には、５ａの電磁コイルにはＢａ
（＝に−Ｈａ寡）の磁束密度が、５ｂのコイルにはＢｂ
（−に−ｆ（ｂ”）の磁束密度が生じるように印加すれ
ばよい。Therefore, as shown in Fig. 1(a), when the amount of molten steel buildup is Ha and Hb, the electromagnetic coil 5a has Ba.
The magnetic flux density of (= ni - Ha less) is Bb for the 5b coil.
(It is sufficient to apply it so that a magnetic flux density of -f(b'') is generated at -.
以上のように浸漬ノズルの両側に設置したレベル計によ
って湯面レベルを測定し、その値にもとづいてそれぞれ
の電磁コイルに別々に印加して溶鋼流を制御すれば、偏
流は解消されてパウダーの巻き込みは少なくなり、内部
欠陥や表面疵のない健全な鋳片が製造される。As described above, if the molten metal level is measured using the level meters installed on both sides of the immersion nozzle, and the molten steel flow is controlled by applying voltage to each electromagnetic coil separately based on that value, the uneven flow will be eliminated and the powder flow will be controlled. Entrainment is reduced, and a healthy slab without internal defects or surface flaws is produced.
（実施例）
以下、実施例により本発明の溶鋼湯面レベル制御方法を
説明する。(Example) Hereinafter, the molten steel level control method of the present invention will be explained with reference to Examples.
第１図に示すような鋳型（一対の湯面レベル針及び電磁
コイルを備えている）に第１表に示す化学組成の溶鋼を
鋳込み、その湯面を渦流式レベル計で測定し、その値を
用いて前記（１）式により磁束密度を演算し、左右の溶
鋼盛り上がり量の差が±５−−以内となるようにそれぞ
れの電磁コイルへ印加するフィードバック１１１′ｍを
行い、２ｍ／分の鋳造速度で、幅１．６００ｓｕｓ、厚
さ２００ｍ■のスラブを製造した。そして、のるかみ（
未溶融パウダー又はスカムが凝固シェルに捕捉されて生
じた鋳片表面欠陥）の発生状態を調べた。また本発明法
の効果を明らかにするために、同じ鋳造条件で従来法及
び比較法による鋳造を実施した。従来法とは渦流式セン
サーで湯面の１点を測定し、それにもとづいてタンディ
シュのスライディングゲートを摺動させて湯面レベルを
制御した場合である。その場合、溶鋼湯面の盛り上がり
量の差は±１５腸−程度に制御することができた。比較
法とは第１図に示す電磁コイルのそれぞれに３．０００
ガウスの静磁場を印加して溶鋼流を制御した場合である
。この場合には、盛り上がり量の差は±ｌＯ−−程度に
制御することができた。Molten steel having the chemical composition shown in Table 1 is poured into a mold as shown in Figure 1 (equipped with a pair of level needles and an electromagnetic coil), and the level of the molten steel is measured with an eddy current level meter. The magnetic flux density is calculated using the equation (1) above, and feedback 111'm is applied to each electromagnetic coil so that the difference in the amount of molten steel swelling on the left and right sides is within ±5. At the casting speed, a slab with a width of 1.600 sus and a thickness of 200 m was produced. And Norukami (
The occurrence of surface defects in slabs caused by unmelted powder or scum trapped in the solidified shell was investigated. Further, in order to clarify the effects of the method of the present invention, casting was carried out using the conventional method and the comparative method under the same casting conditions. The conventional method involves measuring a single point on the hot water level using an eddy current sensor, and then controlling the hot water level by sliding the sliding gate of the tundish based on that measurement. In that case, the difference in the amount of rise of the molten steel surface could be controlled to about ±15 mm. The comparative method is to apply 3.000 to each of the electromagnetic coils shown in Figure 1.
This is a case where the flow of molten steel is controlled by applying a Gaussian static magnetic field. In this case, the difference in the amount of swelling could be controlled to about ±lO--.
（以下、余白）
第 １ 表 （重量％）
その結果を第３図に示す、同図から明らかなように、本
発明法の場合ののるかみ発生率は０．２％以下ときわで
小さい、これに対して従来法の場合には０６８％を越え
、比較法の場合でも０．７％に達している。(Hereinafter, blank space) Table 1 (% by weight) The results are shown in Figure 3.As is clear from the figure, the occurrence rate of chewing in the case of the method of the present invention is 0.2% or less, which is small. On the other hand, in the case of the conventional method, it exceeds 0.068%, and even in the case of the comparative method, it reaches 0.7%.
（発明の効果）
以上説明したように本発明の湯面レベル制御方法によれ
ば、浸漬ノズルの左右側の湯面レベルを常に同じ高さに
することができる。その結果、パウダーの巻き込みがな
くなり、内部欠陥や表面疵の少ない健全な鋳片を製造す
ることができる。(Effects of the Invention) As explained above, according to the hot water level control method of the present invention, the hot water level on the left and right sides of the immersion nozzle can always be kept at the same height. As a result, there is no powder entrainment, and a healthy slab with few internal defects and surface flaws can be manufactured.
第１図は、本発明の方法を実施する連続鋳造用鋳型の長
辺方向の概略断面図、
第２図は、第１図に示す鋳型の平面図、第３図は、本発
明法、従来法、及び比較法の場合ののろかみ発生率を示
す図、
である。
ｌは鋳型、２は浸漬ノズル、２ａ及び２ｂは吐出口、３
は溶鋼、４ａ及び４ｂは湯面レベル計、５ａ及び５ｂは
電磁コイル。FIG. 1 is a schematic sectional view in the long side direction of a continuous casting mold for carrying out the method of the present invention, FIG. 2 is a plan view of the mold shown in FIG. 1, and FIG. This is a diagram showing the incidence of sluggishness in the case of the method and the comparative method. l is the mold, 2 is the immersion nozzle, 2a and 2b are the discharge ports, 3
is molten steel, 4a and 4b are molten metal level meters, and 5a and 5b are electromagnetic coils.
Claims (1)
計と電磁コイルを設け、このレベル計により湯面レベル
を測定し、その測定値にもとづいて前記電磁コイルをそ
れぞれ独立して作動させ、湯面レベルを制御することを
特徴とする鋳型内溶鋼の湯面レベル制御方法。A pair of molten metal level gauges and electromagnetic coils are provided with a nozzle immersed in the molten steel in the mold sandwiched between them, the molten metal level is measured by the level meters, and each of the electromagnetic coils is operated independently based on the measured value, A method for controlling the level of molten steel in a mold, characterized by controlling the level of the molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12258889A JPH02303663A (en) | 1989-05-16 | 1989-05-16 | Method for controlling molten steel surface level in mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12258889A JPH02303663A (en) | 1989-05-16 | 1989-05-16 | Method for controlling molten steel surface level in mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02303663A true JPH02303663A (en) | 1990-12-17 |
Family
ID=14839639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12258889A Pending JPH02303663A (en) | 1989-05-16 | 1989-05-16 | Method for controlling molten steel surface level in mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02303663A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100801116B1 (en) * | 2001-12-22 | 2008-02-05 | 재단법인 포항산업과학연구원 | A nonuniform flow detection system of submerged entry nozzle in continuous casting mold with free surface height measurement |
| CN109158567A (en) * | 2018-09-30 | 2019-01-08 | 武汉钢铁有限公司 | Continuous casting production even pours process constant liquis position control method |
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| JPS63212051A (en) * | 1987-02-27 | 1988-09-05 | Nkk Corp | Method for controlling variation of molten metal surface in continuous casting |
| JPS6483356A (en) * | 1987-09-25 | 1989-03-29 | Nippon Kokan Kk | Method for controlling metal flow in continuous casting mold |
| JPH0199763A (en) * | 1987-10-12 | 1989-04-18 | Kawasaki Steel Corp | Method for controlling molten steel discharging flow in mold for continuous casting |
| JPH0289544A (en) * | 1988-09-27 | 1990-03-29 | Nippon Steel Corp | Method for controlling molten steel flow in mold in continuous casting |
-
1989
- 1989-05-16 JP JP12258889A patent/JPH02303663A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JPS63212051A (en) * | 1987-02-27 | 1988-09-05 | Nkk Corp | Method for controlling variation of molten metal surface in continuous casting |
| JPS6483356A (en) * | 1987-09-25 | 1989-03-29 | Nippon Kokan Kk | Method for controlling metal flow in continuous casting mold |
| JPH0199763A (en) * | 1987-10-12 | 1989-04-18 | Kawasaki Steel Corp | Method for controlling molten steel discharging flow in mold for continuous casting |
| JPH0289544A (en) * | 1988-09-27 | 1990-03-29 | Nippon Steel Corp | Method for controlling molten steel flow in mold in continuous casting |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100801116B1 (en) * | 2001-12-22 | 2008-02-05 | 재단법인 포항산업과학연구원 | A nonuniform flow detection system of submerged entry nozzle in continuous casting mold with free surface height measurement |
| CN109158567A (en) * | 2018-09-30 | 2019-01-08 | 武汉钢铁有限公司 | Continuous casting production even pours process constant liquis position control method |
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