JPH07268444A - Recirculation type vacuum degassing apparatus - Google Patents
Recirculation type vacuum degassing apparatusInfo
- Publication number
- JPH07268444A JPH07268444A JP5936994A JP5936994A JPH07268444A JP H07268444 A JPH07268444 A JP H07268444A JP 5936994 A JP5936994 A JP 5936994A JP 5936994 A JP5936994 A JP 5936994A JP H07268444 A JPH07268444 A JP H07268444A
- Authority
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- Japan
- Prior art keywords
- refractory
- molten steel
- flow velocity
- laid
- tank
- 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.)
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- Treatment Of Steel In Its Molten State (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶鋼の真空脱ガス処理
に使用される環流式真空脱ガス装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflux type vacuum degassing apparatus used for vacuum degassing of molten steel.
【０００２】[0002]
【従来の技術】環流式真空脱ガス装置は図４に示すよう
に上部槽６と下部槽７とをフランジ部９で接合した脱ガ
ス槽８の下部に上昇管３と下降管４とを備えたものであ
る。一方の上昇管３に溶鋼環流用Arガス５を吹込みつつ
取鍋１内の溶鋼２を脱ガス槽８に吸上げ、他方の下降管
４から取鍋１へ排出しながら、取鍋１内の溶鋼２を連続
的に脱ガス槽８内で溶鋼２の脱炭や脱ガス処理を行う装
置である。2. Description of the Related Art A reflux type vacuum degassing apparatus is provided with an ascending pipe 3 and a descending pipe 4 below a degassing tank 8 in which an upper tank 6 and a lower tank 7 are joined by a flange 9 as shown in FIG. It is a thing. Inside the ladle 1 while sucking the molten steel 2 in the ladle 1 into the degassing tank 8 while blowing the Ar gas 5 for molten steel circulation into one of the ascending pipes 3 and discharging it into the ladle 1 from the other descending pipe 4. This is an apparatus for continuously performing decarburization and degassing of the molten steel 2 in the degassing tank 8.
【０００３】この装置においては、この他に合金鉄投入
口10からの合金鉄の投入による成分調整、またAlなどの
脱酸剤投入後、溶鋼環流による非金属介在物の浮上分離
による脱酸等が行われる。時には脱ガス槽内での酸素の
吹付けによる脱炭反応の促進策を取ることがある。環流
式真空脱ガス装置における溶鋼環流量は、Arガス流量、
到達真空度、上昇管、下降管の管径等により支配される
が、この環流量によって脱炭、脱水素、脱酸の速度やそ
れぞれの成分到達濃度が異なる。In addition to the above, in this apparatus, component adjustment is performed by charging ferroalloy from the ferroalloy charging port 10, and after deoxidizing agent such as Al is charged, deoxidation is performed by floating separation of non-metallic inclusions by molten steel reflux. Is done. Occasionally, measures to accelerate the decarburization reaction by blowing oxygen in the degassing tank are taken. The flow rate of molten steel in the reflux type vacuum degasser is the Ar gas flow rate,
It is governed by the ultimate vacuum, the pipe diameter of the ascending pipe, the pipe diameter of the descending pipe, and the like, but the decarburization, dehydrogenation, and deoxidation rates and the respective component arrival concentrations differ depending on the ring flow rate.
【０００４】一方、薄鋼板の品質要求はより厳しくなり
つつあり、とくに極低酸素鋼の場合、鋼板の加工性に直
接関係する炭素濃度に関しては、従来の〔Ｃ〕＝25ppm
よりさらに厳しい低濃度のものが要求されており、たと
えば望ましくは、〔Ｃ〕≦15ppm の溶鋼が必要とされ
る。極低炭素鋼の製造においては、転炉で〔Ｃ〕＝0.02
〜0.04％程度まで脱炭して出鋼し、次に環流式真空脱ガ
ス装置で所望の脱炭処理を行い、さらに脱酸と成分調整
を行うのが一般的である。On the other hand, the quality requirements for thin steel sheets are becoming more stringent, and in the case of extremely low oxygen steels, the carbon concentration directly related to the workability of the steel sheet is the conventional [C] = 25 ppm.
Even more stringent low concentrations are required, for example, [C] ≦ 15 ppm molten steel is desirable. In the production of ultra low carbon steel, [C] = 0.02 in the converter.
It is general to decarburize to about 0.04% and then tap steel, then perform desired decarburization treatment with a reflux type vacuum degassing device, and further perform deoxidation and component adjustment.
【０００５】この際、環流式真空脱ガス装置では次のよ
うな問題点がある。極低炭素〔Ｃ〕≦20ppm 領域までの
脱炭には長い時間を要し、たとえば〔Ｃ〕＝25ppm まで
は10〜15分で到達するが、これ以降は脱炭速度が極めて
遅くなり、〔Ｃ〕≦20ppm を得るには、20分以上の処理
時間を要する。また時には極めて長い時間処理しても
〔Ｃ〕≦20ppm が得られないことがある。脱ガス処理時
には１〜２℃／分の温度降下があるので、長時間処理の
ためには転炉での出鋼温度を高くする必要がある。これ
は転炉耐火物の溶損が著しく増加するので経済的に極め
て不利である。At this time, the reflux type vacuum degassing apparatus has the following problems. It takes a long time to decarburize to an extremely low carbon [C] ≦ 20 ppm region, and for example, it reaches in 10 to 15 minutes until [C] = 25 ppm, but after that, the decarburizing rate becomes extremely slow. C] ≦ 20 ppm requires a processing time of 20 minutes or more. Further, sometimes [C] ≦ 20 ppm cannot be obtained even if the treatment is carried out for an extremely long time. Since there is a temperature drop of 1 to 2 ° C./min during degassing, it is necessary to raise the tapping temperature in the converter for long-term treatment. This is extremely economically disadvantageous because the melting loss of the converter refractory material increases significantly.
【０００６】脱炭速度の増大には処理初期の排気口11か
らの排気速度の増加、湯面への酸素の吹付は、Ar吹込量
の増加等が効果的であるが、脱ガス槽内でのスプラッシ
ュの量が増し、高さも高くなるので、脱ガス槽内壁への
地金付着が増す。この脱ガス槽内壁への地金付着は、次
の溶鋼処理において地金付着の促進や著しい溶鋼汚染を
もたらすので、極低炭素鋼を安定して溶製するのが困難
になる。To increase the decarburization rate, it is effective to increase the exhaust rate from the exhaust port 11 at the beginning of the treatment, and to blow oxygen to the molten metal surface, increase the Ar injection amount. As the amount of splash increases and the height also increases, the adhesion of metal to the inner wall of the degassing tank increases. This adhesion of the metal to the inner wall of the degassing tank promotes the adhesion of the metal in the next molten steel treatment and causes significant contamination of the molten steel, which makes it difficult to stably manufacture the extremely low carbon steel.
【０００７】このような問題を解決する手段として、た
とえば、下記のものが開示されている。 （１）特開平４−272120号公報には、環流式真空脱ガス
装置の下部槽の胴部断面形状を長円形とすることにより
脱ガス処理中の反応速度を大幅に増大させるものが開示
されている。As means for solving such a problem, for example, the following has been disclosed. (1) Japanese Patent Application Laid-Open No. 4-272120 discloses that the cross-sectional shape of the body of the lower tank of the reflux type vacuum degassing apparatus is oval to significantly increase the reaction rate during the degassing process. ing.
【０００８】（２）特開平２−8316号公報には、脱ガス
槽の上昇管直上の溶鋼面をスプラッシュ飛散防止板でお
おい、高真空度で脱ガスすることにより、初期の排気速
度を増加して脱炭速度を促進させるものが開示されてい
る。 （３）特開平４−333512号公報には、環流式真空脱ガス
装置により〔Ｃ〕が10ppm 以下の極低炭素鋼を溶製する
ため、脱ガス槽内で所定鋼中炭素濃度まで脱炭した後、
脱ガス槽内の真空度を下げて水素含有物質を脱ガス槽内
へ添加して所定の鋼中水素濃度に調整後、脱ガス槽内の
真空度を上げてから脱炭するものが開示されている。(2) In Japanese Unexamined Patent Publication No. 2-8316, the initial exhaust speed is increased by covering the molten steel surface directly above the rising pipe of the degassing tank with a splash plate to prevent degassing at a high degree of vacuum. It has been disclosed that the decarburization rate is accelerated. (3) In Japanese Unexamined Patent Publication (Kokai) No. 4-333512, an ultra-low carbon steel having a [C] of 10 ppm or less is melted by a reflux type vacuum degassing apparatus. After doing
It is disclosed that the degree of vacuum in the degassing tank is lowered and a hydrogen-containing substance is added into the degassing tank to adjust the hydrogen concentration in the predetermined steel, and then the degree of vacuum in the degassing tank is raised before decarburization. ing.
【０００９】（４）特開昭64−79317 号公報には、上昇
管に吹込む環流用Arガスを２系統にし、一方の系統のガ
ス圧と他方の系統のガス圧に差を付けることにより、上
昇管内の溶鋼中を浮上する気泡の上昇域を側面から中央
部までに拡大するとして溶鋼環流量を増大するものが開
示されている。(4) In Japanese Patent Laid-Open No. 64-79317, there are two systems of circulating Ar gas blown into an ascending pipe, and a gas pressure of one system and a gas pressure of the other system are differentiated from each other. It is disclosed that the molten steel ring flow rate is increased by expanding the rising region of the bubbles floating in the molten steel in the rising pipe from the side surface to the central portion.
【００１０】[0010]
【発明が解決しようとする課題】前記公報に開示された
従来技術のうち、（１）の下部槽を長円形化するものお
よび（２）のスプラッシュ飛散防止板を設けるものは既
存の環流式真空脱ガス装置に適用するには大規模な初期
投資を必要とするという問題点がある。また（３）の脱
ガス槽内へ水素含有物質を添加して真空度を変化させる
ものおよび（４）の上昇管に吹込む環流Arガスを２系統
にするものはランニングコストが嵩むという問題点があ
る。いずれの手段も既存の環流式真空脱ガス装置に対す
る脱炭能力向上策としては不向きである。Among the prior arts disclosed in the above publications, (1) the one in which the lower tank is oval and (2) the one in which the splash scattering prevention plate is provided are the existing recirculation type vacuums. There is a problem that a large-scale initial investment is required to apply it to a degasser. In addition, there is a problem that the running cost increases in the case where the hydrogen-containing substance is added to the degassing tank (3) to change the degree of vacuum and the case where the circulating Ar gas blown into the rising pipe in (4) has two systems. There is. None of the means is suitable for improving the decarburizing capacity of the existing reflux type vacuum degassing equipment.
【００１１】本発明はこのような事情にかんがみてなさ
れたものであり、既存の環流式真空脱ガス装置に大規模
な初期投資を要することなく容易に適用できると共に、
ランニングコストを必要としない環流式真空脱ガス装置
を提供することを目的とするものである。The present invention has been made in view of such circumstances, and can be easily applied to an existing reflux type vacuum degassing apparatus without requiring a large-scale initial investment.
It is an object of the present invention to provide a reflux type vacuum degassing apparatus that does not require running costs.
【００１２】[0012]
【課題を解決するための手段】一般に環流式真空脱ガス
装置における溶鋼の脱炭速度は溶鋼環流量に依存してい
ると云わてれている。図５に示すように下部槽７に形成
された平坦な敷耐火物12上を流れる溶鋼流すなわち上昇
管３から下部槽７に入り敷耐火物12上を流れて下降管４
に入るときの溶鋼流は一様ではない。It is generally said that the decarburization rate of molten steel in a reflux type vacuum degassing apparatus depends on the molten steel recirculation flow rate. As shown in FIG. 5, the molten steel flow flowing on the flat laid refractory material 12 formed in the lower tank 7, that is, the rising pipe 3 enters the lower tub 7 and flows on the laid refractory material 12 and the downcomer pipe 4.
The molten steel flow on entering is not uniform.
【００１３】すなわち、上昇管３の中心点と下降管４の
中心点を結ぶ中心線上の溶鋼流速をピークにして両サイ
ドに行くにつれて次第に流速が小さくなる。とくに上昇
管３および下降管の外径同志を平行な接線で結んで区画
される長円形13の内側における溶鋼流速が外側の溶鋼流
速に比較して著しく高い。本発明はこのような下部槽の
敷耐火物上を流れる溶鋼流速に差があり分布が均一でな
いことに着目し、溶鋼の流速分布を可及的に均等化する
ことを目的にしてなされたものであり、その要旨とする
ところは下記の通りである。That is, the molten steel flow velocity on the center line connecting the center points of the ascending pipe 3 and the descending pipe 4 peaks, and the flow velocity gradually decreases toward both sides. In particular, the molten steel flow velocity inside the oval 13, which is defined by connecting the outer diameters of the ascending pipe 3 and the descending pipe by parallel tangent lines, is significantly higher than the molten steel flow velocity at the outside. The present invention has been made for the purpose of equalizing the flow velocity distribution of molten steel as much as possible, paying attention to the fact that the distribution of molten steel flowing over the refractory in the lower tank is different and the distribution is not uniform. The main points are as follows.
【００１４】本発明は、下部槽の底部から上昇管および
下降管を取鍋の溶鋼内に浸漬させ、溶鋼を上昇管および
下降管を通して槽内に循環させる環流式真空脱ガス装置
において、下部槽の敷耐火物を、上昇管および下降管の
外径同志を平行な接線で結んで区画される長円形の内側
敷耐火物を外側敷耐火物よりも高さレベルを50〜100mm
低くして段差を付け溝状にしたことを特徴とする環流式
真空脱ガス装置である。The present invention relates to a reflux type vacuum degassing apparatus in which a rising pipe and a descending pipe are immersed in molten steel of a ladle from the bottom of the lower tank and the molten steel is circulated through the rising pipe and the descending pipe into the tank. The insole refractory of the ellipse is divided by connecting the outer diameters of the ascending pipe and the descending pipe with parallel tangents, and the ellipse-shaped insole refractory has a height level of 50 to 100 mm higher than the outside refractory.
The circulating-type vacuum degassing device is characterized in that it is formed into a groove shape by lowering the height.
【００１５】[0015]
【作用】本発明では、上昇管および下降管の外径同志を
平行な接線で結んで区画される長円形の内側敷耐火物を
外側敷耐火物よりも高さレベルを50〜100mm 低くして段
差を付け溝状にしてあるので、長円形の内側を流れる溶
鋼の流れに対する直角方向断面積が高さレベルを低くし
た分だけ大きくなるので、長円形の外側を流れる溶鋼の
流れに対する直角方向断面積が小さくなる。なお段差Ｘ
＝50〜100mm にしたのは溶鋼環流平均厚さから考えて設
定したものである。In the present invention, the ellipse-shaped insole refractory, which is divided by connecting the outer diameters of the ascending pipe and the descending pipe with parallel tangents, has a height level lower by 50 to 100 mm than the outside refractory. Since the groove is formed with a step, the cross-section in the direction perpendicular to the flow of molten steel flowing inside the ellipse is increased by the height level, so the cross-section in the direction perpendicular to the flow of molten steel flowing outside the ellipse is increased. The area becomes smaller. The step X
= 50 to 100 mm is set considering the average thickness of molten steel reflux.
【００１６】その結果、本発明では、段差のない従来の
敷耐火物の場合に比較して相対的に長円形の内側の溶鋼
流速が小さくなり、長円形の外側の溶鋼流速が大きくな
るため、全体として溶鋼の速度分布が均等化される。こ
のような槽内で敷耐火物上を流れる溶鋼流速の均等化に
より槽内における溶鋼の脱炭、脱ガス能力向上が達成さ
れる。As a result, in the present invention, the molten steel flow velocity inside the ellipse is relatively small and the molten steel flow velocity outside the ellipse is relatively high, as compared with the case of the conventional refractory laying material having no step. The velocity distribution of molten steel is equalized as a whole. By equalizing the flow rate of molten steel flowing over the laid refractory in such a tank, the decarburization and degassing ability of the molten steel in the tank can be improved.
【００１７】[0017]
【実施例】以下、本発明の実施例を図面に基いて説明す
ると、図１は環流式真空脱ガス装置における下部槽７の
水平断面図を模式的にしたものである。また、図２は図
１のＡ−Ａ矢視を示す断面図であり、図３は図１のＢ−
Ｂ矢視を示す断面図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic horizontal sectional view of a lower tank 7 in a reflux type vacuum degassing apparatus. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line B- of FIG.
It is sectional drawing which shows B arrow.
【００１８】本発明に係る環流式真空脱ガス装置は図１
〜図３に示すように、下部槽７の敷耐火物12を上昇管３
および下降管４の外径同志を平行な接線で結んで区画さ
れる長円形13の内側敷耐火物12ａを外側耐火物12ｂより
もＸ＝50〜100mm 低くなるように段差を付けて溝状にし
たものである。図５に示すように従来は下部槽７の敷耐
火物12は平坦で同一高さに施工されていたため上昇管３
から下降管４への溶鋼環流の速度分布は不均一になって
いると推定される。本発明では図１〜図３に示すように
長円形13の内側敷耐火物12ａを外側耐火物12ｂよりも低
くなるように段差を付けて溝状にしてある。The reflux type vacuum degassing apparatus according to the present invention is shown in FIG.
~ As shown in Fig. 3, the refractory material 12 in the lower tank 7 is connected to the rising pipe 3
And the refractory 12a of the ellipse 13 which is divided by connecting the outer diameters of the downcomer pipe 4 with parallel tangents is formed into a groove with a step so that the refractory 12a is X = 50 to 100 mm lower than the refractory 12b. It was done. As shown in FIG. 5, conventionally, the refractory material 12 in the lower tank 7 was flat and constructed at the same height, so that the rising pipe 3
It is estimated that the velocity distribution of the molten steel recirculation from the to the downcomer pipe 4 is non-uniform. In the present invention, as shown in FIGS. 1 to 3, the refractory 12a having an oval shape 13 is stepped so as to be lower than the refractory 12b having an outer shape, and has a groove shape.
【００１９】本発明では段差のない平坦な敷耐火物の場
合に比較して相対的に長円形13の内側の高さレベルを50
〜100mm 低くしてあるので溶鋼の流れに対する直角方向
の断面積が高さレベルを低くした分だけ大きくなるので
長円形13の外側を流れる溶鋼の流れに対する直角方向の
断面積が小さくなる。その結果、本発明では、段差のな
い平坦な従来の敷耐火物の場合に比較して相対的に長円
形13の内側敷耐火物12ａ上を流れる溶鋼の流速が小さく
なり、長円形13の外側耐火物12ｂ上を流れる溶鋼流速が
大きくなり、全体として溶鋼の速度分布が均等化される
ことになる。In the present invention, the height level inside the ellipse 13 is set to 50 in comparison with the case of a flat laid refractory without steps.
Since the height is made lower by -100 mm, the cross-sectional area in the direction perpendicular to the flow of molten steel becomes larger by the amount of lowering the height level, and therefore the cross-sectional area in the direction perpendicular to the flow of molten steel flowing outside the oval 13 becomes small. As a result, in the present invention, the flow velocity of the molten steel flowing on the inner laying refractory 12a of the ellipse 13 becomes relatively smaller than that of the conventional flat laying refractory without steps, and the outer side of the oval 13 is reduced. The molten steel flow velocity flowing over the refractory 12b is increased, and the velocity distribution of the molten steel is equalized as a whole.
【００２０】このようにして内側敷耐火物12ａと外側敷
耐火物12ｂとの段差Ｘ＝50〜100mmを設けておけば溶鋼
流速分布が均等化され槽内溶鋼の反応界面積当りの溶鋼
循環量もより均一化されるので脱炭反応、脱ガス速度を
向上できる。図１〜図３に示すように下部槽７の敷耐火
物12に長円形13の内側敷耐火物12ａと外側敷耐火物12ｂ
に段差を付けた本発明および図５に示すように敷耐火物
に段差を付けない従来の環流式真空脱ガス装置を用いて
極低炭素鋼を溶製する実験を行った。なお、上昇管およ
び下降管の内径は 500mmφ、環流Arガス量2000Nl／min
により到達〔Ｃ〕＝35ppm として脱炭処理した。In this way, if the step X = 50 to 100 mm between the insole refractory 12a and the outside refractory 12b is provided, the molten steel flow velocity distribution is equalized, and the molten steel circulation amount per reaction boundary area of the molten steel in the tank is equalized. Since it is more uniform, the decarburization reaction and degassing rate can be improved. As shown in FIGS. 1 to 3, the refractory material 12 in the lower tank 7 is provided with the refractory material 12a and the refractory material 12b having an elliptical shape 13 inside and outside.
An experiment was carried out to manufacture ultra-low carbon steel using the present invention in which a step is added to the above and a conventional circulating-type vacuum degassing apparatus in which a laying refractory is not stepped as shown in FIG. The inner diameter of the ascending and descending pipes is 500 mmφ, and the amount of circulating Ar gas is 2000 Nl / min.
Reached by [C] = 35 ppm for decarburization.
【００２１】従来の環流式真空脱ガス装置によれば、溶
鋼の到達〔Ｃ〕＝35ppm にするのに15分を要したのに対
し、本発明では溶鋼の反応界面当りの循環量が均一化さ
れるので脱炭反応が促進され到達〔Ｃ〕＝35ppm にする
のに14分に短縮することができた。According to the conventional reflux type vacuum degassing apparatus, it took 15 minutes to reach the molten steel [C] = 35 ppm, whereas in the present invention, the circulation amount per reaction interface of the molten steel becomes uniform. As a result, the decarburization reaction was accelerated, and it was possible to shorten the time to reach [C] = 35 ppm by 14 minutes.
【００２２】[0022]
【発明の効果】以上説明したように本発明によれば、下
部槽の敷耐火物を、上昇管および下降管の外径同志を平
行な接線で結んで区画される長円形の内側敷耐火物を外
側敷耐火物より高さレベルを50〜100mm 低くして段差を
付け溝状にしたので、槽内の敷耐火物上を流れる溶鋼の
流速分布が均等化される。このため反応界面当りの溶鋼
循環流が均一化され脱炭反応、脱ガス速度の向上が達成
でき、脱ガス処理時間を短縮できる。As described above, according to the present invention, the ellipse-shaped insole refractory is constructed by partitioning the insole refractory in the lower tank by connecting the outer diameters of the ascending pipe and the descending pipe with parallel tangents. Since the height level is lower than that of the outer refractory material by 50 to 100 mm and the groove is formed by forming a step, the flow velocity distribution of the molten steel flowing over the refractory material in the tank is equalized. For this reason, the molten steel circulating flow per reaction interface is made uniform, the decarburization reaction and the degassing rate can be improved, and the degassing treatment time can be shortened.
【図１】本発明に係る下部槽の断面を示す模式図であ
る。FIG. 1 is a schematic view showing a cross section of a lower tank according to the present invention.
【図２】図１のＡ−Ａ矢視を示す断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図３】図１のＢ−Ｂ矢視を示す断面図である。FIG. 3 is a cross-sectional view taken along the line BB of FIG.
【図４】従来の環流式真空脱ガス装置を示す全体断面図
である。FIG. 4 is an overall sectional view showing a conventional reflux type vacuum degassing apparatus.
【図５】従来の下部槽内の溶鋼流速分布を示す平面図で
ある。FIG. 5 is a plan view showing a molten steel flow velocity distribution in a conventional lower tank.
１ 取鍋 ２ 溶鋼 ３ 上昇管 ４ 下降管 ５ Arガス ６ 上部槽 ７ 下部槽 ８ 脱ガス槽 ９ フランジ部 10 合金鉄投入口 11 排気口 12 敷耐火物 12ａ 内側敷耐火物 12ｂ 外側敷耐火物 13 長円形 1 Ladle 2 Molten Steel 3 Ascending Pipe 4 Downcomer 5 Ar Gas 6 Upper Tank 7 Lower Tank 8 Degassing Tank 9 Flange 10 Alloy Iron Inlet 11 Exhaust 12 Refractory 12a Inner Refractory 12b Outer Refractory 13 Oval
Claims (1)
取鍋の溶鋼内に浸漬させ、溶鋼を上昇管および下降管を
通して槽内に循環させる環流式真空脱ガス装置におい
て、下部槽の敷耐火物を、上昇管および下降管の外径同
志を平行な接線で結んで区画される長円形の内側敷耐火
物を外側敷耐火物よりも高さレベルを50〜100mm 低くし
て段差を付け溝状にしたことを特徴とする環流式真空脱
ガス装置。1. A circulating-type vacuum degassing apparatus in which a rising pipe and a descending pipe are immersed in molten steel of a ladle from the bottom of the lower tank, and the molten steel is circulated through the rising pipe and the descending pipe into the tank. The refractory has an oval inner lining refractory, which is divided by connecting the outer diameters of the ascending and descending pipes with parallel tangents. A reflux type vacuum degassing device characterized by having a groove shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5936994A JPH07268444A (en) | 1994-03-29 | 1994-03-29 | Recirculation type vacuum degassing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5936994A JPH07268444A (en) | 1994-03-29 | 1994-03-29 | Recirculation type vacuum degassing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07268444A true JPH07268444A (en) | 1995-10-17 |
Family
ID=13111295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5936994A Pending JPH07268444A (en) | 1994-03-29 | 1994-03-29 | Recirculation type vacuum degassing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07268444A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217747A (en) * | 2006-02-16 | 2007-08-30 | Nippon Steel Corp | Structure for laying vessel bottom bricks in rh type vacuum degassing vessel |
| JP2008202080A (en) * | 2007-02-19 | 2008-09-04 | Jfe Steel Kk | Vacuum vessel structure and repairing method of vacuum-degassing facility |
-
1994
- 1994-03-29 JP JP5936994A patent/JPH07268444A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007217747A (en) * | 2006-02-16 | 2007-08-30 | Nippon Steel Corp | Structure for laying vessel bottom bricks in rh type vacuum degassing vessel |
| JP4664834B2 (en) * | 2006-02-16 | 2011-04-06 | 新日本製鐵株式会社 | RH type vacuum degassing tank bottom brick structure |
| JP2008202080A (en) * | 2007-02-19 | 2008-09-04 | Jfe Steel Kk | Vacuum vessel structure and repairing method of vacuum-degassing facility |
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