JP5516393B2 - Ladle operation method - Google Patents

Ladle operation method Download PDF

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JP5516393B2
JP5516393B2 JP2010288381A JP2010288381A JP5516393B2 JP 5516393 B2 JP5516393 B2 JP 5516393B2 JP 2010288381 A JP2010288381 A JP 2010288381A JP 2010288381 A JP2010288381 A JP 2010288381A JP 5516393 B2 JP5516393 B2 JP 5516393B2
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ladle
porous plug
molten steel
inert gas
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JP2012135779A (en
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亮輔 廣岡
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Nippon Steel Corp
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Description

本発明は、低コストで、安全性を考慮しつつ、ポーラスプラグの寿命延長を図ることができる取鍋の操業方法に関するものである。   The present invention relates to a ladle operating method capable of extending the lifetime of a porous plug at low cost while considering safety.

取鍋精錬時、溶鋼を攪拌するための不活性ガスは、取鍋の底部に設けたポーラスプラグから吹込まれる。取鍋精錬後は、取鍋を連続鋳造設備まで搬送して取鍋内の溶鋼をタンディッシュに排出し、溶鋼の排出後は、取鍋整備場でポーラスプラグの点検を行う。   At the time of ladle refining, an inert gas for stirring the molten steel is blown from a porous plug provided at the bottom of the ladle. After ladle refining, the ladle is transported to the continuous casting facility and the molten steel in the ladle is discharged to the tundish. After the molten steel is discharged, the porous plug is inspected at the ladle maintenance site.

上記を基本とする取鍋操業方法において、従来は取鍋精錬以後、取鍋整備場でのポーラスプラグの点検開始までは、ポーラスプラグへの不活性ガスの供給は行われない。従って、取鍋精錬以後タンディッシュへの溶鋼排出完了までの、取鍋内に溶鋼が存在する間は、取鍋内溶鋼の静圧によってポーラスプラグ内に地金差しが発生し、また、スラグの浸潤が頻繁に起こっていた（図７参照）。図７中の１は取鍋、２はポーラスプラグ、３は不活性ガスの供給用ホース、４は溶鋼である。   In the ladle operating method based on the above, conventionally, the inert gas is not supplied to the porous plug after the ladle refining until the inspection of the porous plug at the ladle maintenance site. Therefore, as long as molten steel is present in the ladle from ladle refining until the discharge of molten steel to the tundish, the metal plug in the porous plug is generated by the static pressure of the molten steel in the ladle, and the slag Infiltration occurred frequently (see FIG. 7). In FIG. 7, 1 is a ladle, 2 is a porous plug, 3 is an inert gas supply hose, and 4 is molten steel.

このようなポーラスプラグを再使用するため、取鍋整備場では、取鍋の内部側からポーラスプラグを酸素ガスを用いて洗浄しているが、前記地金差し等によってその洗浄に長時間を要していた。その結果、ポーラスプラグの取鍋内部側の損傷が過大になって、ポーラスプラグの寿命が短くなるという問題があった。   In order to reuse such a porous plug, at the ladle maintenance site, the porous plug is washed with oxygen gas from the inside of the ladle. Was. As a result, there has been a problem that damage to the inside of the ladle of the porous plug becomes excessive and the life of the porous plug is shortened.

そこで、取鍋の側面または底面に蓄圧ボンベ式ガス吹込み装置を着脱可能に取付け、ポーラスプラグからの不活性ガス吹込み終了と同時に蓄圧ボンベからのガス吹込みに切り替える方法が開示されている（特許文献１）。   Therefore, a method is disclosed in which a pressure accumulation cylinder type gas blowing device is detachably attached to the side surface or the bottom surface of the ladle, and the gas injection from the pressure accumulation cylinder is switched simultaneously with the end of the inert gas blowing from the porous plug. Patent Document 1).

この特許文献１で開示された方法によれば、ポーラスプラグへの溶鋼の侵入を抑えることで、酸素洗浄数を軽減でき、プラグの寿命延長に効果があると記載されている。   According to the method disclosed in Patent Document 1, it is described that the number of oxygen washings can be reduced by suppressing the penetration of molten steel into the porous plug, which is effective in extending the life of the plug.

しかしながら、この特許文献１で開示された方法を実施するには、取鍋の側面または底面に蓄圧ボンベ式ガス吹込み装置を着脱可能に取付けることができるように取鍋を改造する必要があり、コストがかかる。また、取鍋の側面または底面に取付けた蓄圧ボンベが障害物等に接触した場合には、蓄圧ボンベが破損する危険性が懸念される。   However, in order to carry out the method disclosed in Patent Document 1, it is necessary to modify the ladle so that the accumulator cylinder type gas blowing device can be detachably attached to the side surface or bottom surface of the ladle. There will be a cost. Moreover, when the pressure accumulation cylinder attached to the side surface or bottom surface of the ladle comes into contact with an obstacle or the like, there is a concern that the pressure accumulation cylinder may be damaged.

特許第４１０７４０９号公報Japanese Patent No. 4107409

本発明は、上記の問題に鑑みてなされたものであり、その課題は低コストかつ安全性を考慮して、ポーラスプラグ整備時の酸素洗浄の負荷と耐火物の損傷が軽減できる、取鍋ポーラスプラグ使用における効果的な操業方法を提供することである。   The present invention has been made in view of the above-mentioned problems, and the problem thereof is a ladle porous that can reduce oxygen washing load and refractory damage during maintenance of the porous plug in consideration of low cost and safety. It is to provide an effective operating method in the use of plugs.

本発明に係る取鍋の操業方法では、一つの特徴として、取鍋精錬後にポーラスプラグから溶鋼へのガス吹込みを停止した後にも、取鍋精錬中にポーラスプラグ内に充満させておいたガスを保持しておき、かつ、それを取鍋からの溶鋼排出末期に効果的に吐出させることでポーラスプラグの通気性を確保する。   In the ladle operating method according to the present invention, as one feature, the gas that has been filled in the porous plug during ladle refining even after the gas injection from the porous plug to the molten steel is stopped after ladle refining. The porous plug is ensured to be air permeable by discharging it effectively at the end of discharging the molten steel from the ladle.

そのために、取鍋底部に設けたポーラスプラグから不活性ガスを溶鋼へ吹込む取鍋精錬において、前記ポーラスプラグに不活性ガスを供給する配管の途中に逆止弁を設置し、当該逆止弁とポーラスプラグ間の配管内のガス圧力が、取鍋精錬以後、タンディッシュへの溶鋼排出完了までの取鍋内に溶鋼が存在する間は、取鍋内の溶鋼静圧に近い値に保持できるようにしておく。   Therefore, in the ladle refining in which inert gas is blown into the molten steel from the porous plug provided at the bottom of the ladle, a check valve is installed in the middle of the pipe for supplying the inert gas to the porous plug. The gas pressure in the pipe between the pipe and the porous plug can be maintained at a value close to the molten steel static pressure in the ladle as long as there is molten steel in the ladle from the ladle refining until the discharge of the molten steel to the tundish. Keep it like that.

こうしておくことにより、その後、取鍋から連続鋳造機へ溶鋼が排出されるにつれて取鍋内の溶鋼静圧が低下した際、ポーラスプラグから溶鋼へと不活性ガスが自然に吐出するようにできる。   By doing so, when the molten steel static pressure in the ladle is lowered as the molten steel is subsequently discharged from the ladle to the continuous casting machine, the inert gas can be naturally discharged from the porous plug to the molten steel.

この特徴により、ポーラスプラグへの地金差しやスラグの浸潤が抑制でき、かつ、使用後のポーラスプラグの通気性が確保されて、その後のポーラスプラグの整備において、ポーラスプラグを酸素洗浄しなくてよい確率を高くすることができる。   Due to this feature, it is possible to suppress the infiltration of the metal plug and slag into the porous plug, and the air permeability of the porous plug after use is ensured. In the maintenance of the porous plug, the porous plug is not cleaned with oxygen. Good probability can be increased.

さらに、本発明ではもう一つの特徴として、ポーラスプラグを酸素洗浄する必要が生じた場合、取鍋整備場にてポーラスプラグを酸素洗浄する際にポーラスプラグに取鍋外より取鍋内へ向けてガスを流し、予め定めておいた所定流量以上の通気を確保すると自動的に信号を発するようにしておく。   Furthermore, in the present invention, as another feature, when it is necessary to clean the porous plug with oxygen, when the porous plug is cleaned with oxygen at the ladle maintenance site, the porous plug is directed from the outside of the ladle to the inside of the ladle. When a gas is flowed and a ventilation exceeding a predetermined flow rate is secured, a signal is automatically generated.

この特徴により、ポーラスプラグ内の通気性が確保されたら酸素洗浄を終了し、過剰な洗浄を防止することができる。   With this feature, when air permeability in the porous plug is ensured, oxygen cleaning can be terminated and excessive cleaning can be prevented.

本発明では、前記した二つの特徴によって、多数回使用を目的としたポーラスプラグ整備における酸素洗浄の必要性を下げ、かつ、その洗浄時間を短縮して、酸素洗浄によるポーラスプラグの損耗速度の低減によるポーラスプラグの寿命向上が図れる。その結果、低コストでかつ安全性を考慮した、ポーラスプラグ使用を伴う効果的な取鍋操業方法が提供される。   In the present invention, due to the two features described above, the need for oxygen cleaning in the maintenance of a porous plug intended for multiple use is reduced, and the cleaning time is shortened to reduce the wear rate of the porous plug by oxygen cleaning. The life of the porous plug can be improved. As a result, an effective ladle operation method involving the use of a porous plug in consideration of safety at low cost is provided.

本発明の取鍋操業方法の前段階の構成を説明する図である。It is a figure explaining the structure of the previous step of the ladle operation method of this invention. 本発明の取鍋操業方法における溶鋼排出中の説明図で、（ａ）は溶鋼排出初期、（ｂ）は溶鋼排出末期の図である。It is explanatory drawing during the molten steel discharge | emission in the ladle operating method of this invention, (a) is a molten steel discharge | emission initial stage, (b) is a figure of the molten steel discharge | emission final stage. 本発明の取鍋操業方法の後段階の構成を説明する図である。It is a figure explaining the structure of the latter stage of the ladle operation method of this invention. 本発明方法と従来方法のポーラスプラグの酸素洗浄時間を比較した図である。It is the figure which compared the oxygen cleaning time of the porous plug of this invention method and the conventional method. 本発明方法と従来方法のポーラスプラグの溶損速度を比較した図である。It is the figure which compared the melting rate of the porous plug of this invention method and the conventional method. 本発明方法と従来方法のポーラスプラグの寿命を比較した図である。It is the figure which compared the lifetime of the porous plug of this invention method and the conventional method. 従来の取鍋操業方法について説明する図である。It is a figure explaining the conventional ladle operation method.

以下、本発明について説明する。
ポーラスプラグは、取鍋精錬において不活性ガスを溶鋼中に吹込むために使用しており、従来、取鍋精錬後、連続鋳造機へ溶鋼を排出して、取鍋整備場でポーラスプラグの点検を開始するまで、終始不活性ガスを溶鋼中に吹込むことなく操業をしていた。 The present invention will be described below.
Porous plugs are used to blow inert gas into molten steel during ladle refining. Conventionally, after ladle refining, molten steel is discharged to a continuous casting machine, and inspection of porous plugs at the ladle maintenance facility is started. Until then, the operation was carried out without blowing inert gas into the molten steel.

そのため、ポーラスプラグへの地金差し、スラグ浸潤が頻繁に起こり、ポーラスプラグを酸素洗浄する必要性が高く、しかもその洗浄時間が長くなる場合が多かった。その結果、ポーラスプラグが過大に溶損され、その寿命が低迷するという問題があった。   For this reason, metal plugs and slag infiltration into the porous plug frequently occur, and the necessity for oxygen cleaning of the porous plug is high, and the cleaning time is often long. As a result, there has been a problem that the porous plug is excessively melted and its life is sluggish.

そこで、取鍋精錬操業中にポーラスプラグ内に充満した不活性ガスが、取鍋精錬後に溶鋼が連続鋳造機へ排出されて取鍋底部に作用する溶鋼静圧が小さくなった際に自然に流れ出す機構を着想した。こうすることにより、取鍋内の溶鋼静圧と充満させたガス圧力が釣り合って、地金差しやスラグの浸潤の防止が可能となる上に、使用後のポーラスプラグの通気性も確保されると考えた。   Therefore, the inert gas filled in the porous plug during the ladle refining operation naturally flows out when the molten steel is discharged to the continuous casting machine after ladle refining and the molten steel static pressure acting on the bottom of the ladle is reduced. Inspired by the mechanism. By doing so, the molten steel static pressure in the ladle balances with the filled gas pressure, and it is possible to prevent infiltration of the metal bar and slag, and also ensure the breathability of the porous plug after use. I thought.

さらに、鋳造終了後にポーラスプラグから不活性ガスを強制的に吐出させることで、ポーラスプラグの酸素洗浄時間の短縮、酸素洗浄によるポーラスプラグの損耗速度の低減が図れ、一層ポーラスプラグの寿命向上が図れると考えた。   In addition, by forcibly discharging the inert gas from the porous plug after the casting is completed, the oxygen cleaning time of the porous plug can be shortened, the wear rate of the porous plug can be reduced by oxygen cleaning, and the life of the porous plug can be further improved. I thought.

また、ポーラスプラグの酸素洗浄を行う場合、ポーラスプラグの酸素洗浄中にポーラスプラグに取鍋外より取鍋内へ向けてガスを流すことで、ポーラスプラグの通気性が確保できたら信号を発し、過剰なポーラスプラグの洗浄を終了させることで大幅な洗浄時間の短縮が可能になると考えた。   In addition, when performing oxygen cleaning of the porous plug, a gas is sent to the porous plug from the outside of the ladle to the inside of the ladle during oxygen cleaning of the porous plug. We thought that the cleaning time could be greatly shortened by finishing the cleaning of the excessive porous plug.

本発明は、発明者の上記着想に基づいて成されたものであり、以下の構成を備えることによって実現する事ができる。   The present invention has been made based on the above-mentioned idea of the inventor, and can be realized by including the following configuration.

先ず、取鍋精錬中に取鍋のポーラスプラグ内に不活性ガスを充満させ、取鍋精錬後、取鍋内の溶鋼量の減少に応じてポーラスプラグから不活性ガスを吐出させる手段として、図１に示すように、不活性ガスの供給用配管、例えばホース３の途中に逆止弁５を設置する。   First, as a means for filling the ladle porous plug with inert gas during ladle refining, and discharging the inert gas from the porous plug according to the decrease in the amount of molten steel in the ladle after ladle refining, As shown in FIG. 1, a check valve 5 is installed in the middle of an inert gas supply pipe, for example, a hose 3.

この逆止弁５の設置位置は、ホース３の途中であれば特に問わないが、取鍋精錬後連続鋳造設備に移動させる時に邪魔にならず、タンディッシュへの溶鋼排出時にポーラスプラグ２から吐出させる不活性ガスの量を考慮して決定する。   The check valve 5 may be installed at any position in the middle of the hose 3, but it does not get in the way when moved to the continuous casting facility after ladle refining, and discharged from the porous plug 2 when the molten steel is discharged to the tundish. The amount is determined in consideration of the amount of inert gas to be generated.

この様に逆止弁５を設置することによって、ポーラスプラグ２からの不活性ガスの吹込み終了後も、逆止弁５とポーラスプラグ２を繋ぐホース内に、タンディッシュに排出する前の取鍋内の溶鋼静圧と例えば同等の２０×１０4Paの不活性ガスを存在させることが可能になる。従って、取鍋精錬後、連続鋳造設備に到着して溶鋼排出を開始するまでの間で地金差しやスラグの浸潤の発生を防止できて、ポーラスプラグ２の通気性を確保することができるようになる。この不活性ガスの圧力は、取鍋精錬終了時の溶鋼静圧にバランスする値を保持することが望ましくはあるが、それより低い圧力であっても期待効果が全く発揮されないわけではない。 By installing the check valve 5 in this way, even after the end of the blowing of the inert gas from the porous plug 2, the removal before the tundish is discharged into the hose connecting the check valve 5 and the porous plug 2. For example, an inert gas of 20 × 10 4 Pa, which is equivalent to the static pressure of the molten steel in the pan, can be present. Therefore, after the ladle refining, it is possible to prevent the invasion of the ingot and the slag between the arrival at the continuous casting facility and the start of the discharge of molten steel, and the air permeability of the porous plug 2 can be ensured. become. Although it is desirable to maintain the pressure of the inert gas at a value balanced with the molten steel static pressure at the end of the ladle refining, even if the pressure is lower than that, the expected effect is not completely exhibited.

また、取鍋内の溶鋼４をタンディッシュに排出している間は、取鍋内の溶鋼量の減少に伴い、前記ホース３の内の不活性ガスの圧力が溶鋼静圧より大きくなると、図２に示すように、ポーラスプラグ２から徐々に不活性ガスが取鍋内に吐出する。従って、取鍋内の溶鋼４をタンディッシュに排出している間も、地金差しやスラグの浸潤の発生を防止できると同時に、高温溶鋼の存在も利用してポーラスプラグ２の通気性を確保できるようになる。   Further, while the molten steel 4 in the ladle is being discharged to the tundish, the pressure of the inert gas in the hose 3 becomes greater than the molten steel static pressure as the amount of molten steel in the ladle decreases. As shown in FIG. 2, the inert gas is gradually discharged from the porous plug 2 into the ladle. Therefore, while discharging the molten steel 4 in the ladle to the tundish, it is possible to prevent the invasion of the metal bar and slag, and at the same time ensure the breathability of the porous plug 2 by utilizing the presence of the high temperature molten steel. become able to.

したがって、上記取鍋精錬終了後から連続鋳造設備に到着して溶鋼排出を開始するまでの間の期待効果と、その後、取鍋からの溶鋼排出末期までの期待効果を合わせて考えると、ポーラスプラグ内に封じ込めておく不活性ガスの圧力は、取鍋からの溶鋼排出開始時点で１０×１０4Pa以上が必要である。但し、この圧力は高いほど効果が大きくなるので、取鍋からの溶鋼排出開始時点で１８×１０4Pa以上等であることが望ましい。 Therefore, considering the expected effect from the end of the ladle refining until the start of the discharge of molten steel after arriving at the continuous casting facility, and the expected effect until the end of the molten steel discharge from the ladle, The pressure of the inert gas confined in the inside needs to be 10 × 10 4 Pa or more at the time of starting the molten steel discharge from the ladle. However, the higher the pressure, the greater the effect. Therefore, it is desirable that the pressure is 18 × 10 4 Pa or more at the time when the molten steel is discharged from the ladle.

その後、取鍋内の溶鋼４の排出が終了した時点以降で、外部から不活性ガスを供給するホースと連結し、取鍋１のポーラスプラグ２から、タンディッシュに排出する前の溶鋼静圧以上の圧力（例えば５０×１０4Pa）で不活性ガスを再度吹込めば、さらなる通気性の向上を見込むこともできる。 After that, after the discharge of the molten steel 4 in the ladle is completed, it is connected to a hose that supplies an inert gas from the outside, and is higher than the molten steel static pressure before being discharged from the porous plug 2 of the ladle 1 to the tundish. If the inert gas is blown again at a pressure (eg, 50 × 10 4 Pa), a further improvement in air permeability can be expected.

以上の構成により、取鍋内溶鋼４のタンディッシュへの排出後のポーラスプラグ２の整備において、ポーラスプラグ２を酸素洗浄しなくても良い割合を大きくすることができる。   With the above configuration, in maintenance of the porous plug 2 after discharging the molten steel 4 in the ladle to the tundish, it is possible to increase the proportion of the porous plug 2 that does not need to be oxygen cleaned.

さらに、取鍋内溶鋼４のタンディッシュへの排出終了後、ポーラスプラグ２を酸素洗浄する際には、図３に示すように、取鍋１の外側よりポーラスプラグ２に不活性ガス供給用のホース６を繋いで、タンディッシュへの排出を開始する前の溶鋼静圧以上の圧力（例えば５０×１０4Pa）で取鍋１の外側から内側に不活性ガスを流してポーラスプラグの通気性を確保する。 Furthermore, when the porous plug 2 is cleaned with oxygen after the discharge of the molten steel 4 in the ladle to the tundish, as shown in FIG. 3, an inert gas is supplied to the porous plug 2 from the outside of the ladle 1. Connect the hose 6 and let the inert gas flow from the outside to the inside of the ladle 1 at a pressure (for example, 50 × 10 4 Pa) higher than the molten steel static pressure before starting the discharge to the tundish. Secure.

この際、所定の流量（例えば、取鍋精錬で使用する流量の半分である０．４５Nm3／min）の不活性ガスが流れた時点で例えば警報ランプ７を点灯し、ポーラスプラグ２の過剰な酸素洗浄を終了するようにして、洗浄時間を大幅に短縮すると共にポーラスプラグ２の内部からの劣化、溶損を防ぐことができる。 At this time, for example, an alarm lamp 7 is turned on when an inert gas of a predetermined flow rate (for example, 0.45 Nm 3 / min, which is half of the flow rate used in ladle refining) flows, and the porous plug 2 is excessively charged. By completing the oxygen cleaning, the cleaning time can be greatly shortened, and deterioration and melting damage from the inside of the porous plug 2 can be prevented.

すなわち、本発明では、上記二つの特徴を組み合わせることによって、多数回使用を目的としたポーラスプラグ２の整備における酸素洗浄の必要性を低減し、かつ、酸素洗浄が必要となった場合にもその酸素洗浄時間を短縮して、大きな設備改造を要することなく、酸素洗浄によるポーラスプラグ２の損耗速度の低減によるポーラスプラグ２の寿命向上を図ることができる。   That is, in the present invention, by combining the above two features, the need for oxygen cleaning in the maintenance of the porous plug 2 intended for multiple use is reduced, and even when oxygen cleaning is required It is possible to shorten the oxygen cleaning time and improve the life of the porous plug 2 by reducing the wear rate of the porous plug 2 by oxygen cleaning without requiring a large facility modification.

次に、本発明の効果を確認するために行った実施結果について説明する。
本発明方法では、逆止弁とポーラスプラグを繋ぐホース内の不活性ガスの圧力を１８×１０4Paに維持した。また、ポーラスプラグを酸素洗浄する際には、４５×１０4Paの圧力で取鍋の外側から不活性ガスを流し続け、ガス流量が０．４５Nm3／minに上昇した時点で酸素洗浄を終了した。なお、比較として、逆止弁を設置せず、取鍋の外側から不活性ガスを流さない他は同様の操業を行った従来方法についても実施した。その結果を図４〜図６に示す。 Next, a description will be given of results obtained for confirming the effects of the present invention.
In the method of the present invention, the pressure of the inert gas in the hose connecting the check valve and the porous plug was maintained at 18 × 10 4 Pa. Also, when oxygen cleaning the porous plug, the inert gas is kept flowing from the outside of the ladle at a pressure of 45 × 10 4 Pa, and the oxygen cleaning is finished when the gas flow rate rises to 0.45 Nm 3 / min. did. In addition, as a comparison, a conventional method in which the same operation was performed except that a check valve was not installed and an inert gas was not allowed to flow from the outside of the ladle was also carried out. The results are shown in FIGS.

図４はポーラスプラグの酸素洗浄に要した時間を比較した結果を示した図、図５はポーラスプラグの損耗速度を比較した結果を示した図、図６はポーラスプラグの寿命を比較した結果を示した図である。   FIG. 4 is a diagram showing the result of comparing the time required for oxygen cleaning of the porous plug, FIG. 5 is a diagram showing the result of comparing the wear rate of the porous plug, and FIG. 6 is the result of comparing the life of the porous plug. FIG.

図４に示すように、ポーラスプラグの酸素洗浄に要した時間は、従来法では２．０〜３．０分かかっていたものが、発明方法では１．０分以下に短縮することができた。この酸素洗浄に要した時間の短縮により、図５に示すように、ポーラスプラグの損耗速度は従来法では平均２０mm／回であったものが、発明方法では１０mm／回に軽減でき、結果として、ポーラスプラグの寿命は、発明方法では従来法の２倍に向上した。   As shown in FIG. 4, the time required for oxygen cleaning of the porous plug was 2.0 to 3.0 minutes in the conventional method, but was reduced to 1.0 minutes or less in the inventive method. . By shortening the time required for this oxygen cleaning, as shown in FIG. 5, the wear rate of the porous plug was 20 mm / time on average in the conventional method, but can be reduced to 10 mm / time in the inventive method. The lifetime of the porous plug was improved twice as much as the conventional method in the inventive method.

本発明は上記の例に限らず、請求項に記載された技術的思想の範疇であれば、適宜実施の形態を変更しても良いことは言うまでもない。   The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in the claims.

例えば上記の例では、逆止弁とポーラスプラグを繋ぐホース内に存在させた不活性ガスの圧力は、タンディッシュに排出する前の取鍋内の溶鋼静圧に近い１８×１０4Paとしたが、溶鋼静圧と同等な具体的圧力値は取鍋容量（溶鋼深さ）に依存して変化することは当然である。本発明に係る技術的思想としては、取鍋からの溶鋼排出開始までは１０×１０4Pa以上であって溶鋼静圧に極力近い圧力値を維持し続けることが望ましいのであるが、本発明に係る発明実施効果を享受するためには、１８×１０4Paあれば十分ということが本発明の実施例によって確認されたということである。 For example, in the above example, the pressure of the inert gas present in the hose connecting the check valve and the porous plug is 18 × 10 4 Pa close to the molten steel static pressure in the ladle before being discharged into the tundish. However, it is natural that the specific pressure value equivalent to the molten steel static pressure varies depending on the ladle capacity (molten steel depth). As a technical idea according to the present invention, it is desirable to maintain a pressure value of 10 × 10 4 Pa or more and as close as possible to the molten steel static pressure until the start of discharging the molten steel from the ladle. In order to enjoy the effect of implementing the invention, it is confirmed by the embodiment of the present invention that 18 × 10 4 Pa is sufficient.

また、ポーラスプラグを酸素洗浄する際に流す不活性ガスの圧力は、ポーラスプラグの通気性が確保できればよいので、４５×１０4Paでなくても良い。 In addition, the pressure of the inert gas that flows when the porous plug is oxygen-washed is not limited to 45 × 10 4 Pa as long as the air permeability of the porous plug can be ensured.

１ 取鍋
２ ポーラスプラグ
３ ホース
４ 溶鋼
５ 逆止弁
1 Ladle 2 Porous plug 3 Hose 4 Molten steel 5 Check valve

Claims (1)

取鍋底部に設けたポーラスプラグから溶鋼に不活性ガスを吹込む取鍋精錬を伴う取鍋操業において、
前記ポーラスプラグに不活性ガスを供給する配管の途中に逆止弁を設置して、当該逆止弁とポーラスプラグ間の配管内のガス圧力が、取鍋精錬終了後から取鍋が連続鋳造設備に到着して溶鋼排出を開始する時点で、１０×１０4Pa以上となるように維持すること、
及び、
前記した取鍋内溶鋼を排出後のポーラスプラグの酸素洗浄時に、取鍋の外側よりポーラスプラグに前記溶鋼排出を開始する時点での圧力と同等の圧力をかけて不活性ガスを吹き込み、当該不活性ガスの流量が予め定めておいた流量になった時点で信号を発するようにしておくことを特徴とする取鍋の操業方法。 In ladle operation with ladle refining that blows inert gas into molten steel from the porous plug provided at the bottom of the ladle,
A check valve is installed in the middle of the pipe for supplying the inert gas to the porous plug, and the ladle is continuously cast after the ladle refining is completed. At the time of arriving at the start of the molten steel discharge, maintain at 10 × 10 4 Pa or higher ,
as well as,
During oxygen cleaning of the porous plug after discharging the molten steel in the ladle, an inert gas is blown into the porous plug from the outside of the ladle by applying a pressure equivalent to the pressure at the time of starting the molten steel discharge. A ladle operating method, wherein a signal is generated when the flow rate of the active gas reaches a predetermined flow rate .
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