JPH09150251A - Method for completing pouring of molten steel in ladle - Google Patents
Method for completing pouring of molten steel in ladleInfo
- Publication number
- JPH09150251A JPH09150251A JP30723795A JP30723795A JPH09150251A JP H09150251 A JPH09150251 A JP H09150251A JP 30723795 A JP30723795 A JP 30723795A JP 30723795 A JP30723795 A JP 30723795A JP H09150251 A JPH09150251 A JP H09150251A
- Authority
- JP
- Japan
- Prior art keywords
- ladle
- slag
- molten steel
- outflow
- nozzle
- 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.)
- Withdrawn
Links
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- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、取鍋内スラグの流
出を電磁式検知装置で検知して、取鍋内溶鋼のタンディ
ッシュ内への注入を自動的に終了する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the outflow of slag in a ladle by an electromagnetic detection device and automatically ending the injection of molten steel in the ladle into the tundish.
【０００２】[0002]
【従来の技術】従来、鋼の連続鋳造における取鍋内溶鋼
の注入終了の判定は、オペレーターによる取鍋内スラグ
のタンディッシュ内への流出の目視判定で行っていた。
例えば、取鍋〜タンディッシュ間ロングノズルを用いる
場合は、取鍋スラグがロングノズル内を通ってタンディ
ッシュ内に流出し、該ロングノズル外周部の湯面上に浮
上開始した時点で、ロングノズルを用いずにシールボッ
クスを設置し内部をＡｒシールする方法では、シールボ
ックスに注入流監視用窓を設け、この窓から注入流を観
察し、取鍋スラグの流出を確認した時点で、取鍋注入の
終了を判定していた。2. Description of the Related Art Conventionally, the completion of pouring molten steel in a ladle in continuous casting of steel has been judged by an operator by visually observing the outflow of slag in the ladle into the tundish.
For example, when using a long nozzle between the ladle and the tundish, the ladle slag flows through the long nozzle into the tundish, and when the long nozzle begins to float on the molten metal surface of the outer periphery of the long nozzle, the long nozzle In the method of installing the seal box without using the and sealing the inside with Ar, a window for monitoring the injection flow is provided in the seal box, and the injection flow is observed from this window, and when the outflow of the ladle slag is confirmed, the ladle is The end of infusion was being determined.
【０００３】しかし、これらの方法では取鍋注入の末期
に取鍋からタンディッシュへの注入位置において、オペ
レーターが所定の時間注視しなければならないため、高
温環境下にさらされて作業性が悪く、またオペレーター
の目視に頼るため、スラグ流出の判定に個人差があって
判定タイミングにバラツキを生じ易く、取鍋内残溶鋼量
が増加したり、或いはタンディッシュ内へのスラグ流出
量が多くなり過ぎる欠点がある。However, in these methods, since the operator has to watch the pouring position from the ladle to the tundish for a predetermined time at the end of pouring the ladle, the operator is exposed to a high temperature environment and the workability is poor. Also, because it depends on the operator's visual inspection, there are individual differences in the determination of slag outflow, and the determination timing is likely to vary, and the amount of residual molten steel in the ladle increases, or the amount of slag outflow into the tundish becomes too large. There are drawbacks.
【０００４】このため、従来より各種方式の取鍋スラグ
流出検知技術が報告されている。例えば、鉄と鋼，６６
(1980)，Ｓ８１３には電磁誘導方式が、鉄と鋼，６７(1
981)，Ｓ８４７には取鍋ロングノズルの振動から検知す
る方式が報告されている。また、Ｓtahl u Ｅisen，１
０７(1987)，Ｓ３９７には、取鍋ノズル部に電磁式セン
サーを埋設し、スラグ流出を検知後直ちに取鍋ノズルを
作動させ注入終了作業を自動化する方法が述べられてい
る。For this reason, various types of ladle slag outflow detection techniques have been conventionally reported. For example, iron and steel, 66
(1980), S813 is an electromagnetic induction system, iron and steel, 67 (1
981), S847, a method of detecting from the vibration of the ladle long nozzle is reported. Also, Stahl u Eisen, 1
07 (1987), S397 describes a method of burying an electromagnetic sensor in the ladle nozzle and operating the ladle nozzle immediately after detecting the slag outflow to automate the pouring end work.
【０００５】[0005]
【発明が解決しようとする課題】取鍋注入終了作業は、
連続鋳造における基本作業の一つであり、この場合取鍋
内溶鋼を残さずにタンディッシュ内に注入すると同時
に、取鍋内スラグを極力タンディッシュ内に流出させな
いようにすることが理想である。しかし、取鍋残溶鋼量
と流出スラグ量の両方について同時に極少化することは
難しいため、目的に応じて取鍋残溶鋼量または流出スラ
グ量のどちらかを優先的にミニマムとする操業が指向さ
れるのが一般的である。[Problems to be Solved by the Invention]
This is one of the basic operations in continuous casting. In this case, it is ideal to inject the molten steel in the ladle into the tundish without leaving it and at the same time prevent the slag in the ladle from flowing into the tundish as much as possible. However, it is difficult to minimize both the ladle residual molten steel amount and the outflow slag amount at the same time.Therefore, depending on the purpose, either ladle residual molten steel amount or outflow slag amount should be prioritized to the minimum operation. It is common to
【０００６】例えば、鋳造歩留の向上を重視する場合に
は、取鍋残溶鋼を完全にタンディッシュ内に注入する必
要があるが、この場合取鍋内スラグの流出量は増加す
る。一方、介在物欠陥の少ない高清浄鋼を製造する場合
には、取鍋残溶鋼量が若干多くなるが取鍋スラグ流出量
を皆無またはミニマムとする操業が指向される。また、
タンディッシュ耐火物を無補修で次キャストに再使用す
る操業においては、前キャストの鋳造終了後にタンディ
ッシュ内スラグを極力完全に排出することが重要であ
り、この場合にも取鍋スラグのタンディッシュ内への流
出量をミニマムとする操業が指向される。[0006] For example, when the improvement of casting yield is important, it is necessary to completely inject the residual molten steel in the ladle into the tundish, but in this case, the outflow amount of the slag in the ladle increases. On the other hand, in the case of producing high-purity steel with few inclusion defects, the amount of residual molten steel in the ladle is slightly increased, but the operation is aimed at with no or minimal outflow of ladle slag. Also,
In the operation of reusing the tundish refractory in the next cast without repairing, it is important to discharge the slag in the tundish as completely as possible after the casting of the previous cast is completed. The operation is aimed at the minimum amount of inflow.
【０００７】さて、電磁式スラグ流出検知装置は、高周
波電流発生装置、取鍋注入ノズルの外周部に設けた一次
コイル及び二次コイル、増幅器、スラグ流出判定装置か
らなっている。そして、取鍋スラグ流出検知の原理は、
ノズル内を通る溶鋼とスラグの導電率の差が約１０００
倍あることを活用し、一次コイルにより形成される磁場
により発生する渦電流がスラグ中には溶鋼よりも僅かし
か生じないことを利用し、二次コイルに励起される誘導
起電力の変化率を捉えることにより行われる。The electromagnetic slag outflow detection device comprises a high frequency current generator, a primary coil and a secondary coil provided on the outer peripheral portion of the ladle injection nozzle, an amplifier, and a slag outflow determination device. And the principle of ladle slag outflow detection is
The difference in conductivity between molten steel and slag passing through the nozzle is about 1000
By utilizing the fact that the eddy current generated by the magnetic field formed by the primary coil is generated in the slag less than that of molten steel, the rate of change of the induced electromotive force excited in the secondary coil is utilized. It is done by capturing.
【０００８】以上のように、電磁式スラグ流出検知装置
は、取鍋スラグがノズル内を通ってタンディッシュ内に
流出した時点で検知信号が出力され注入終了と判定する
ものである。即ち、スラグ流出を検知する機能は有して
いるものの、取鍋残溶鋼量や取鍋スラグ流出量を制御す
る機能はないために、スラグ流出検知の状況によって
は、流出スラグ量は少ないが溶鋼が取鍋内に多量に残存
したり、逆に残存溶鋼量は少ないがスラグが多量に流出
するという問題がある。As described above, the electromagnetic slag outflow detecting device determines that the injection is completed by outputting the detection signal when the ladle slag flows through the nozzle into the tundish. That is, although it has a function to detect slag outflow, it does not have a function to control the amount of residual molten steel in the ladle or the amount of outflow of ladle slag. However, there is a problem that a large amount of slag remains in the ladle, and conversely, the amount of residual molten steel is small but a large amount of slag flows out.
【０００９】取鍋スラグの流出は、注入末期の湯面低下
に伴う渦流の形成による湯面上のスラグの吸引により開
始され、最終的には溶鋼高さが限界を切るとスラグのみ
の流出となる。一般に、ノズル直上に形成される溶鋼の
渦流へのスラグの巻き込み割合（ノズル内を通過する溶
鋼に対するスラグの量比）は、取鍋底面からの湯面高さ
の低下と共に急激に増加する。また、ノズル直上部から
ノズル内にかけて形成される渦流の強さは、ノズル径が
一定の場合にはノズル内を通過する溶鋼流量が大きい程
増大する。The outflow of the ladle slag is started by the suction of the slag on the molten metal surface due to the formation of a vortex accompanying the lowering of the molten metal surface at the end of the pouring, and finally when the molten steel height falls below the limit, only the slag flows out. Become. Generally, the slag entrainment ratio (the ratio of the amount of slag to the molten steel passing through the nozzle) to the vortex flow of the molten steel formed immediately above the nozzle rapidly increases as the height of the molten metal from the bottom of the ladle decreases. Further, the strength of the vortex flow formed from immediately above the nozzle to inside the nozzle increases as the molten steel flow rate passing through the nozzle increases when the nozzle diameter is constant.
【００１０】即ち、巻き込みにより流出するスラグ量
は、鋳造断面サイズが大きい程、ストリーム数が多い
程、そして鋳造速度が速いほど増加する。従って、取鍋
残溶鋼量や取鍋スラグ流出量を制御するためには、スラ
グ流出検知時の前記条件を加味した機能を具備する必要
がある。That is, the amount of slag flowing out due to the entrainment increases as the casting cross-section size increases, the number of streams increases, and the casting speed increases. Therefore, in order to control the amount of residual molten steel in the ladle and the outflow amount of the ladle slag, it is necessary to have a function that takes into account the above-mentioned conditions when the slag outflow is detected.
【００１１】[0011]
【課題を解決するための手段】本発明は、前記課題を解
決するものである。即ち、取鍋注入ノズルの外周部に電
磁式スラグ流出検知装置を設けて、取鍋内溶鋼注入の末
期に取鍋内スラグの連続鋳造用タンディッシュ内への流
出を自動検知して取鍋内溶鋼の注入を終了させる方法に
おいて、前記スラグ流出検知装置に接続するタイマー設
定器を設け、該タイマー設定器における設定時間を鋳片
断面サイズ、ストリーム数、鋳造速度の積で決まる溶鋼
注入量によって求め、スラグ流出検知から前記求めた設
定時間経過後に取鍋注入ノズルに閉止指令を出力するも
のである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. That is, an electromagnetic slag outflow detection device is installed on the outer periphery of the ladle injection nozzle, and at the end of the molten steel injection in the ladle, the outflow of the slag in the ladle into the continuous casting tundish is automatically detected and the inside of the ladle is detected. In the method of terminating the injection of molten steel, a timer setting device connected to the slag outflow detection device is provided, and the set time in the timer setting device is determined by the molten steel injection amount determined by the product of the slab cross sectional size, the number of streams, and the casting speed. After the slag outflow detection, the closing command is output to the ladle injecting nozzle after the calculated set time has elapsed.
【００１２】本発明者らは、図１に示すような電磁式取
鍋スラグ流出検知装置を用いてスラグ流出検知について
の測定を行い、オペレーターの目視判定との検知時間
差、取鍋内残溶鋼量及び取鍋スラグ流出量を評価した。The present inventors measured the slag outflow detection using an electromagnetic type ladle slag outflow detection device as shown in FIG. 1, and detected the time difference from the operator's visual judgment and the amount of residual molten steel in the ladle. And the ladle slag outflow rate was evaluated.
【００１３】図１において、１は取鍋、２は取鍋注入ノ
ズル、３は取鍋ロングノズル、４は取鍋スライディング
ノズル、５は取鍋スライディングノズル駆動装置、６は
タンディッシュ、７はタンディッシュストッパー、８は
浸漬ノズル、９は鋳型、１０はピンチロール、１１は取
鍋内溶鋼、１２は取鍋内スラグ、１３はタンディッシュ
内溶鋼、１４はタンディッシュ内スラグ、１５は鋳片、
１６は高周波電流発生装置、１７は一次コイル、１８は
二次コイル、１９は増幅器、２０はスラグ流出判定装
置、２１は鋳造速度計、２２は鋳造条件設定器、２３は
タイマー設定器である。また、図２には、取鍋注入ノズ
ル２の外周部に設置したセンサー部分の一次コイル１
７、二次コイル１８を示す。In FIG. 1, 1 is a ladle, 2 is a ladle injection nozzle, 3 is a ladle long nozzle, 4 is a ladle sliding nozzle, 5 is a ladle sliding nozzle drive device, 6 is a tundish, and 7 is a tank. Dish stopper, 8 immersion nozzle, 9 mold, 10 pinch roll, 11 molten steel in ladle, 12 slag in ladle, 13 molten steel in tundish, 14 slag in tundish, 15 slab,
Reference numeral 16 is a high-frequency current generator, 17 is a primary coil, 18 is a secondary coil, 19 is an amplifier, 20 is a slag outflow determination device, 21 is a casting speed meter, 22 is a casting condition setting device, and 23 is a timer setting device. Further, in FIG. 2, the primary coil 1 of the sensor portion installed on the outer peripheral portion of the ladle injection nozzle 2 is shown.
7, the secondary coil 18 is shown.
【００１４】先ず、スラグ検知時間差の測定方法を以下
に示す。オペレーターによるスラグ流出タイミングの測
定は、注入末期に取鍋内溶鋼１１が減少し取鍋スラグ１
２がタンディッシュ６内に流出開始しタンディッシュ内
溶鋼１３の表面上に浮上した瞬間を目視にて判定し測定
した。First, a method of measuring the slag detection time difference will be described below. When measuring the slag outflow timing by the operator, the molten steel 11 in the ladle decreased and ladle slag 1
The moment when 2 started flowing out into the tundish 6 and floated on the surface of the molten steel 13 in the tundish was visually determined and measured.
【００１５】同時に、二次コイル１８に現れた誘導起電
力の変化をスラグ流出判定装置２０にて測定した。該ス
ラグ流出判定装置に現れる信号（誘導起電力）の経時変
化の代表例を図３に示したが、誘導起電力がノイズレベ
ルよりも高い任意のレベル（しきい値Ｘ）を超えたタイ
ミング（図中Ａ点）をスラグ流出検知と判定するもので
ある。At the same time, the change in the induced electromotive force appearing in the secondary coil 18 was measured by the slag outflow determination device 20. FIG. 3 shows a typical example of the change over time of the signal (induced electromotive force) appearing in the slag outflow determination device. However, the timing at which the induced electromotive force exceeds an arbitrary level (threshold value X) higher than the noise level ( The point A in the figure) is determined as slag outflow detection.
【００１６】電磁式スラグ流出検知装置による検知は、
前述の原理からオペレーターによる検知よりも速く、そ
の時間差を「スラグ流出検知時間差」と定義し測定結果
を図４に示す。図４で明らかなように、スラグ流出判定
装置の方が、オペレーターよりも速いことが判る。しか
し、バラツキが大きいためにスラグ流出検知時間差を注
入流量との関係でプロットすると図５が得られ、注入流
量が小さい程スラグ流出検知時間差が大きくなってい
る。The detection by the electromagnetic slag outflow detection device is
Based on the above-mentioned principle, it is faster than the detection by the operator, and the time difference is defined as "slag outflow detection time difference", and the measurement results are shown in FIG. As is clear from FIG. 4, the slag outflow determination device is faster than the operator. However, since the variation is large, FIG. 5 is obtained when the slag outflow detection time difference is plotted in relation to the injection flow rate, and the smaller the injection flow rate, the larger the slag outflow detection time difference.
【００１７】次に、取鍋残溶鋼量及び流出スラグ量の測
定結果をそれぞれ図６及び図７に示す。両図から、取鍋
残溶鋼量及び流出スラグ量は、溶鋼注入流量の増加に伴
い増加している。また、スラグ流出判定をオペレーター
の目視により行った場合の方が、取鍋残溶鋼量は少なく
流出スラグ量が多いことが知られる。逆に、スラグ流出
検知装置により行った場合は、残溶鋼量が多く流出スラ
グ量が少ない結果になっている。Next, the measurement results of the amount of residual molten steel in the ladle and the amount of outflowing slag are shown in FIGS. 6 and 7, respectively. From both figures, the amount of residual molten steel in the ladle and the amount of outflowing slag increase with the increase in the molten steel injection flow rate. Further, it is known that the amount of residual molten steel in the ladle is small and the amount of slag flowing out is large when the slag outflow determination is visually performed by the operator. On the contrary, when the slag outflow detection device is used, the amount of residual molten steel is large and the amount of outflow slag is small.
【００１８】尚、溶鋼注入流量は下記［１］式で定義し
た。 Ｑ＝Ｓ×Ｎ×ρ×Ｖc ……………………［１］ ここで、Ｑは溶鋼注入流量（Ｔon／min）、Ｓは１スト
リーム当りの鋳造断面積（ｍ2）、Ｎはストリーム数、
ρは溶鋼の比重、Ｖcは鋳造速度（ｍ／min）である。The molten steel injection flow rate was defined by the following equation [1]. Q = S × N × ρ × V c …………………… [1] Here, Q is the molten steel injection flow rate (Ton / min), S is the casting cross-sectional area per stream (m 2 ), N Is the number of streams,
ρ is the specific gravity of molten steel, and V c is the casting speed (m / min).
【００１９】本発明では、上記知見に基ずきスラグ流出
判定装置２０の後にタイマー設定器２３を設け、且つ鋳
造条件設定器２２に鋳造断面積、ストリーム数、溶鋼の
比重を入力すると共に、鋳造速度計２１から鋳造速度Ｖ
cを与えることにより、所定の時間経過後に取鍋スライ
ディングノズル駆動装置５により取鍋注入ノズル２に閉
止指令を出力させるものである。In the present invention, a timer setting device 23 is provided after the slag slag outflow judging device 20 based on the above knowledge, and the casting cross-sectional area, the number of streams and the specific gravity of molten steel are input to the casting condition setting device 22 and the casting is performed. Casting speed V from speedometer 21
By giving c , the ladle sliding nozzle driving device 5 outputs a closing command to the ladle injecting nozzle 2 after a predetermined time has elapsed.
【００２０】[0020]
【作用】本発明では、タイマー設定器における設定時間
Ｔ（sec）を目的に応じて設定するものである。以下
に、具体的に記述する。In the present invention, the set time T (sec) in the timer setter is set according to the purpose. The details will be described below.
【００２１】先ず、鋳造歩留の向上を重視する操業の場
合には、スラグ流出検知後に直ちに取鍋ノズルを閉止す
るのでなく、スラグ流出検知後所定の時間ΔＴ（sec）
経過後に閉止するものである。例えば、 図５の関係から、溶鋼注入流量Ｑに応じたスラグ流出
検知時間差ΔＴを表１の如く設定する。First, in the case of an operation that emphasizes the improvement of casting yield, the ladle nozzle is not closed immediately after the slag outflow detection, but a predetermined time ΔT (sec) after the slag outflow detection.
It will be closed after a lapse of time. For example, from the relationship of FIG. 5, the slag outflow detection time difference ΔT according to the molten steel injection flow rate Q is set as shown in Table 1.
【００２２】図５の関係について直線回帰式を求める
と、 ΔＴ＝−０．８６２Ｑ＋５．３３……………［２］ が得られるので、スラグ流出検知後［２］式を満足する
ΔＴを設定する。 直線回帰式以外に、Ｑの増加に対してΔＴが減少する
ような他の関係式での設定も可能である。When a linear regression equation is obtained for the relationship shown in FIG. 5, ΔT = −0.862Q + 5.33 ... [2] is obtained. Therefore, after detection of slag outflow, ΔT that satisfies the equation [2] is set. To do. In addition to the linear regression equation, other relational expressions such that ΔT decreases as Q increases can be set.
【００２３】[0023]
【表１】 [Table 1]
【００２４】次に、取鍋内スラグの流出をミニマムに抑
制するる場合には、オペレーターよりも電磁式スラグ流
出検知装置の方が優れていることから、ΔＴ＝０（sec)
として取鍋注入ノズルを閉止するものである。Next, in the case of suppressing the outflow of slag in the ladle to a minimum, ΔT = 0 (sec) because the electromagnetic slag outflow detection device is superior to the operator.
As a result, the ladle injection nozzle is closed.
【００２５】[0025]
【実施例】実施例については以下に示す。ヒートサイズ
２６０Ｔ／Ｃｈのブルーム・ビレット兼用連鋳機におい
て、図１に示す取鍋スラグ流出検知装置を設置し鋳造を
行った。鋳造条件は、ブルーム鋳造においては鋳片サイ
ズ３５０×５６０ｍｍ、ストリーム数４、鋳造速度範囲
０．５０〜０．７５ｍ／min、ビレット鋳造においては
鋳片サイズ１６２×１６２ｍｍ、ストリーム数６、鋳造
速度範囲１．４０〜〜２．５０ｍ／minである。EXAMPLES Examples are shown below. In a continuous caster with a heat size of 260 T / Ch for both bloom and billet, the ladle slag outflow detection device shown in FIG. 1 was installed and casting was performed. Casting conditions are: slab size 350 x 560 mm, stream number 4, casting speed range 0.50 to 0.75 m / min in bloom casting, billet size 162 x 162 mm, stream number 6, casting speed range in billet casting It is 1.40 to 2.50 m / min.
【００２６】スラグ流出検知装置については、高周波電
流発生装置で一次コイルに周波数５００Ｈｚ、電流１０
００ｍｍＡの電流を流し、二次コイルで取鍋注入ノズル
内の溶鋼に誘起される約２００〜３００ｍｍＶの起電力
を測定し、該誘導起電力を増幅してその変化率を測定
し、変化率３５％のレベルを敷居値(図３のＸ値に対応)
としてスラグ流出検知を行った。尚、ノズル内が溶鋼の
みの場合の誘導起電力の変化率（ノイズレベルに対応）
は約５％以下、スラグが流出してノズル内を通過した場
合の変化率は１００％である。As for the slag outflow detection device, a high frequency current generator is used, and the primary coil has a frequency of 500 Hz and a current of 10
A current of 00 mmA is passed, an electromotive force of about 200 to 300 mmV induced in the molten steel in the ladle injecting nozzle is measured by the secondary coil, the induced electromotive force is amplified, and its change rate is measured. The level of% is the threshold value (corresponding to the X value in Fig. 3)
As a result, the slag outflow was detected. The rate of change of induced electromotive force when the nozzle is made of molten steel only (corresponding to the noise level)
Is about 5% or less, and the change rate when the slag flows out and passes through the nozzle is 100%.
【００２７】さて、本発明の実施例１として先ず鋳造歩
留の向上を重視する操業を行った。即ち、図１に示した
装置を用い、スラグ流出検知後に直ちに取鍋ノズルを閉
止するのでなく、鋳造条件設定器２２の情報から注入流
量Ｑを演算し、タイマー設定器２３にて図５の関係から
求めた表１に記す所定の時間ΔＴ（sec）経過後に、取
鍋注入ノズル駆動装置５により取鍋注入ノズル４を閉止
し取鍋残溶鋼量を測定した。また、比較例１として、オ
ペレーターの目視にてスラグ流出の確認及び取鍋注入ノ
ズルの閉止を行った場合、更に比較例２として取鍋スラ
グ流出検知装置を用いスラグ流出検知後に直ちに（即ち
ΔＴ＝０）取鍋注入ノズルを閉止した場合について取鍋
残溶鋼量を測定した。As Example 1 of the present invention, first, an operation was carried out with an emphasis on improving the casting yield. That is, by using the device shown in FIG. 1, the pouring nozzle Q is not closed immediately after the slag outflow is detected, but the injection flow rate Q is calculated from the information of the casting condition setting device 22, and the timer setting device 23 performs the relationship of FIG. After the lapse of a predetermined time ΔT (sec) obtained from Table 1, the ladle pouring nozzle driving device 5 closed the ladle pouring nozzle 4 and the residual ladle molten steel amount was measured. Further, as Comparative Example 1, when the operator visually confirms the slag outflow and closes the ladle injecting nozzle, as Comparative Example 2, the ladle slag outflow detection device is used and immediately after the slag outflow detection (that is, ΔT = 0) The amount of residual molten steel in the ladle was measured when the ladle injection nozzle was closed.
【００２８】実施結果を表２に示す。表から明らかなよ
うに、本発明になる方法では取鍋残溶鋼量は明らかに少
なく、且つ取鍋注入終了を自動的に行うことが可能であ
りその効果は大きい。また、ΔＴとして［２］式を満足
する値で行った結果においても同様の結果が得られた。The execution results are shown in Table 2. As is clear from the table, the amount of residual molten steel in the ladle is obviously small in the method according to the present invention, and the ladle injection can be automatically completed, which is a great effect. Further, similar results were obtained even when the value of ΔT was a value satisfying the expression [2].
【００２９】[0029]
【表２】 [Table 2]
【００３０】次に、本発明の実施例２として、取鍋スラ
グの流出量をミニマムに抑制する操業を行った。実施結
果を表３に示す。この場合の比較例として、オペレータ
ーの目視による方法でのスラグ流出量を測定し比較し
た。表３から、本発明になる方法では、スラグ流出量は
約４５％減少している。その結果、溶鋼中の介在物欠陥
が減少し、また多連々鋳を行った後のタンディッシュ内
スラグ量が減少し、その結果として鋳造終了後のタンデ
ィッシュ内スラグの排出が完璧に行われ、再使用操業を
順調に行うことが可能となった。Next, as Example 2 of the present invention, an operation was carried out to minimize the outflow of ladle slag. The results of the implementation are shown in Table 3. As a comparative example in this case, the slag outflow amount was measured and compared by a method visually observed by the operator. From Table 3, in the method according to the present invention, the slag outflow amount is reduced by about 45%. As a result, inclusion defects in molten steel are reduced, and the amount of slag in the tundish after performing multiple castings is reduced, and as a result, the slag in the tundish after casting is completely discharged, It became possible to carry out the reuse operation smoothly.
【００３１】[0031]
【表３】 [Table 3]
【００３２】[0032]
【発明の効果】本発明によれば、取鍋注入終了作業を自
動的に行いながら目的に応じて取鍋残湯量の極少化、ま
たは取鍋スラグ流出量の大幅な低減を図ることが可能で
あり、操業コストの大幅な低減、品質の向上並びにスラ
グ流出確認要員の省力化が達成され、その適用効果は極
めて大きい。According to the present invention, the amount of remaining hot water in the ladle can be minimized or the amount of outflow of the ladle slag can be significantly reduced while automatically performing the ladle pouring end work. Yes, significant reduction of operating cost, improvement of quality and labor saving of slag outflow confirmation personnel have been achieved, and its application effect is extremely large.
【図１】は本発明を示す図、FIG. 1 is a diagram showing the present invention,
【図２】は取鍋注入ノズル外周部のセンサーを示す図、[Fig. 2] is a view showing a sensor around the periphery of the ladle injection nozzle,
【図３】はスラグ流出判定装置の信号を示す図、FIG. 3 is a diagram showing a signal of a slag outflow determination device,
【図４】はスラグ流出検知時間差を示す図、FIG. 4 is a diagram showing a slag outflow detection time difference,
【図５】は取鍋注入量とスラグ検知時間差の関係を示す
図、FIG. 5 is a diagram showing a relationship between a ladle injection amount and a slag detection time difference,
【図６】は取鍋注入量と取鍋残溶鋼量の関係を示す図、FIG. 6 is a diagram showing a relationship between a ladle injection amount and a ladle residual molten steel amount,
【図７】は取鍋注入量と流出スラグ量の関係を示す図。FIG. 7 is a diagram showing a relationship between a ladle injection amount and an outflow slag amount.
１…取鍋、 ２…取鍋注入ノズル、 ３…取鍋ロングノ
ズル、 ４…取鍋スライディングノズル、 ５…取鍋ス
ライディングノズル駆動装置、 ６…タンディッシュ、
７…タンディッシュストッパー、 ８…浸漬ノズル、
９…鋳型、１０…ピンチロール、 １１…取鍋内溶
鋼、 １２…取鍋内スラグ、 １３…タンディッシュ内
溶鋼、 １４…タンディッシュ内スラグ、 １５…鋳
片、 １６…高周波電流発生装置、 １７…一次コイ
ル、 １８…二次コイル、 １９…増幅器、 ２０…ス
ラグ流出判定装置、 ２１…鋳造速度計、 ２２…鋳造
条件設定器、 ２３…タイマー設定器。1 ... Ladle, 2 ... Ladle injection nozzle, 3 ... Ladle long nozzle, 4 ... Ladle sliding nozzle, 5 ... Ladle sliding nozzle drive device, 6 ... Tundish,
7 ... Tundish stopper, 8 ... Immersion nozzle,
9 ... Mold, 10 ... Pinch roll, 11 ... Molten steel in ladle, 12 ... Ladle slag, 13 ... Tundish molten steel, 14 ... Tundish slag, 15 ... Cast piece, 16 ... High frequency current generator, 17 ... primary coil, 18 ... secondary coil, 19 ... amplifier, 20 ... slag outflow determination device, 21 ... casting speed meter, 22 ... casting condition setting device, 23 ... timer setting device.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２２Ｄ 46/00 8719−4Ｋ Ｂ２２Ｄ 46/00 (72)発明者 島影 肇 北海道室蘭市仲町12番地 新日本製鐵株式 会社室蘭製鐵所内 (72)発明者 成田 津 北海道室蘭市仲町12番地 ニッテツ北海道 制御システム株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location B22D 46/00 8719-4K B22D 46/00 (72) Inventor Hajime Shimakage 12 Nakamachi, Muroran-shi, Hokkaido Shin Japan Steel Co., Ltd. Muroran Works (72) Inventor Narita Tsu 12 Nakamachi, Muroran, Hokkaido Nittetsu Hokkaido Control System Co., Ltd.
Claims (1)
出検知装置を設けて、取鍋内溶鋼注入の末期に取鍋内ス
ラグの連続鋳造用タンディッシュ内への流出を自動検知
して取鍋内溶鋼の注入を終了させる方法において、前記
スラグ流出検知装置に接続するタイマー設定器を設け、
該タイマー設定器における設定時間を鋳片横断面サイ
ズ、ストリーム数、鋳造速度の積で決まる溶鋼注入流量
によって求め、スラグ流出検知から前記求めた設定時間
経過後に取鍋注入ノズルに閉止指令を出力することを特
徴とする取鍋内溶鋼の注入終了方法。1. An electromagnetic slag outflow detection device is provided on the outer periphery of the ladle injection nozzle to automatically detect outflow of the slag in the ladle into the continuous casting tundish at the end of the molten steel injection in the ladle. In the method of ending the injection of molten steel in the ladle, provided with a timer setting device connected to the slag outflow detection device,
The set time in the timer setter is determined by the molten steel injection flow rate determined by the product of the slab cross-sectional size, the number of streams, and the casting speed, and a closing command is output to the ladle injection nozzle after the calculated set time has elapsed from the slag outflow detection. A method for ending the injection of molten steel in a ladle, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30723795A JPH09150251A (en) | 1995-11-27 | 1995-11-27 | Method for completing pouring of molten steel in ladle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30723795A JPH09150251A (en) | 1995-11-27 | 1995-11-27 | Method for completing pouring of molten steel in ladle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09150251A true JPH09150251A (en) | 1997-06-10 |
Family
ID=17966693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30723795A Withdrawn JPH09150251A (en) | 1995-11-27 | 1995-11-27 | Method for completing pouring of molten steel in ladle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09150251A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015066556A (en) * | 2013-09-26 | 2015-04-13 | 新日鐵住金株式会社 | Injection method for ladle molten steel in continuous casting |
| JP2015521546A (en) * | 2012-06-29 | 2015-07-30 | バオシャン アイアン アンド スティール カンパニー リミテッド | Method and apparatus for controlling molten steel injection in continuous casting |
-
1995
- 1995-11-27 JP JP30723795A patent/JPH09150251A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015521546A (en) * | 2012-06-29 | 2015-07-30 | バオシャン アイアン アンド スティール カンパニー リミテッド | Method and apparatus for controlling molten steel injection in continuous casting |
| JP2015066556A (en) * | 2013-09-26 | 2015-04-13 | 新日鐵住金株式会社 | Injection method for ladle molten steel in continuous casting |
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