JPH04272120A - Rh degasifier - Google Patents
Rh degasifierInfo
- Publication number
- JPH04272120A JPH04272120A JP3010091A JP3010091A JPH04272120A JP H04272120 A JPH04272120 A JP H04272120A JP 3010091 A JP3010091 A JP 3010091A JP 3010091 A JP3010091 A JP 3010091A JP H04272120 A JPH04272120 A JP H04272120A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- tank
- reflux
- degassing
- cross
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 238000007872 degassing Methods 0.000 claims description 64
- 238000010992 reflux Methods 0.000 claims description 37
- 238000009849 vacuum degassing Methods 0.000 claims description 4
- 238000005261 decarburization Methods 0.000 abstract description 10
- 238000006356 dehydrogenation reaction Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、二次精錬分野の主要な
プロセスである炉外精錬法、特に真空脱ガス法における
取鍋から溶鋼を吸引し脱ガス処理するＲＨ脱ガス装置に
関するものである。[Industrial Field of Application] The present invention relates to an RH degassing device for sucking molten steel from a ladle and degassing it in the out-of-furnace refining method, which is a major process in the field of secondary refining, and in particular in the vacuum degassing method. be.
【０００２】0002
【従来の技術】図１に通常使用されているＲＨ脱ガス装
置による溶鋼処理の模式図を示す。図に示したＲＨ脱ガ
ス装置は、真空排気ポンプにその上部にて結合される、
２分割の槽をフランジ接合した真空脱ガス槽３および４
と、真空脱ガス槽４の底部に一体に設けられる環流管５
と、環流管５の下側のフランジ部６でフランジ接合によ
り接続され、その側壁を貫通して環流ガス導入配管９が
設けられた浸漬管７とから構成されており、真空排気ポ
ンプによる真空脱ガス槽３および４の負圧効果と、環流
管５内に環流ガス導入配管９から導入された例えばアル
ゴンガスによる気泡リフトポンプの効果とにより、取鍋
８中の溶鋼１０が、浸漬管７および環流管５を経て脱ガ
ス槽４内に環流されるものである。2. Description of the Related Art FIG. 1 shows a schematic diagram of molten steel processing using a commonly used RH degassing device. The RH degasser shown in the figure is coupled at its upper part to a vacuum evacuation pump.
Vacuum degassing tanks 3 and 4 with flange-joined two-part tanks
and a reflux pipe 5 provided integrally at the bottom of the vacuum degassing tank 4.
and an immersion pipe 7 which is connected by flange joint at the lower flange part 6 of the recirculation pipe 5 and has a recirculation gas introduction pipe 9 penetrating its side wall. Due to the negative pressure effect of the gas tanks 3 and 4 and the effect of a bubble lift pump using, for example, argon gas introduced into the reflux pipe 5 from the reflux gas introduction pipe 9, the molten steel 10 in the ladle 8 flows into the immersion pipe 7 and It is refluxed into the degassing tank 4 via the reflux pipe 5.
【０００３】かかるＲＨ脱ガス装置において、脱ガス作
用である脱炭反応や脱水素反応は脱ガス槽内の溶鋼内で
生じるため、脱ガス作用を促進させるには、ｉ）反応界
面面積を増やすこと、すなわち脱ガス槽の断面積を増加
させること、ｉｉ）脱ガス槽内への溶鋼供給速度を増加
させることが重要であることは知られている。[0003] In such a RH degassing device, the degassing effects, such as decarburization and dehydrogenation reactions, occur within the molten steel in the degassing tank, so in order to promote the degassing effect, the following steps are required: i) increasing the reaction interface area; It is known that it is important to increase the cross-sectional area of the degassing tank; and ii) to increase the feed rate of molten steel into the degassing tank.
【０００４】例えば、これら脱ガス作用を促進する提案
がなされた発明には、特開平２−２４７３１５号公報に
て提案された発明のごとく、脱ガス槽内の溶鋼の自由表
面に接する部分での断面積を可及的に広くしたＲＨ脱ガ
ス装置や、ＣＡＭＰ−ＩＳＩＪ（１９９０），ｐ１５６
−ｐ１５７にて示されたごとく、脱ガス槽の下部槽のみ
を可及的に広くし、同時に浸漬管径を増して、溶鋼供給
速度を増加させた構造のＲＨ脱ガス装置がある。[0004] For example, inventions that have been proposed to promote these degassing effects include the invention proposed in Japanese Patent Application Laid-Open No. 2-247315, in which a portion of the molten steel in the degassing tank contacts the free surface. RH degassing equipment with as wide a cross-sectional area as possible, CAMP-ISIJ (1990), p156
As shown on page 157, there is an RH degassing device that has a structure in which only the lower tank of the degassing tank is made as wide as possible, and at the same time, the diameter of the immersion pipe is increased to increase the molten steel supply rate.
【０００５】[0005]
【発明が解決しようとする課題】しかし、かかる上述し
たような従来の構造のＲＨ脱ガス装置にあっても、下部
槽や環流管の相対配置が適切でない場合には、脱炭反応
や脱水素反応の反応速度に顕著な増加が見られないとい
う問題があった。[Problems to be Solved by the Invention] However, even in the conventional RH degassing device as described above, if the relative arrangement of the lower tank and the reflux pipe is not appropriate, decarburization and dehydrogenation may occur. There was a problem in that there was no noticeable increase in the reaction rate.
【０００６】これは、脱ガス槽内で溶鋼の一部が排出さ
れずにとどまっていたり、スラグが一部の溶鋼表面に停
滞することによると考えられる。This is thought to be because some of the molten steel remains in the degassing tank without being discharged, or slag remains on the surface of some of the molten steel.
【０００７】本発明は、かかる問題点を解決し、スムー
ズな脱ガス槽内での溶鋼流れを生じさせることにより有
効な反応界面面積と溶鋼供給速度を確保して、脱炭反応
や脱水素反応の反応速度の大幅な促進を図り得るＲＨ脱
ガス装置を提供することを目的とする。[0007] The present invention solves these problems and ensures an effective reaction interface area and molten steel supply rate by generating a smooth flow of molten steel in the degassing tank, thereby facilitating decarburization and dehydrogenation reactions. An object of the present invention is to provide an RH degassing device that can significantly accelerate the reaction rate of.
【０００８】[0008]
【課題を解決するための手段】本発明は上記問題点を解
決するために、ＲＨ脱ガス装置の形状を所定の形状とし
て反応速度の促進を図ったものである。[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention aims at accelerating the reaction rate by using a predetermined shape for the RH degassing device.
【０００９】すなわち、槽底部から一対の環流管を取鍋
の溶鋼内に浸漬させ、溶鋼を該環流管を通して槽内に循
環させるＲＨ脱ガス装置において、溶鋼処理中に溶鋼と
接触する部位の槽の横断面形状を長軸Ｘ１ と短軸Ｘ２
とから成る長円形状となし、前記一対の環流管を前記
底部の長軸方向に配設し、長軸Ｘ１ と短軸Ｘ２ とが
下記式０．４≦Ｘ２ ／Ｘ１ ≦０．９
を満足する構造としたことを特徴とするＲＨ脱ガス装置
を提供する。That is, in an RH degassing device in which a pair of reflux pipes are immersed in molten steel in a ladle from the bottom of the tank and the molten steel is circulated into the tank through the reflux pipes, the part of the tank that comes into contact with the molten steel during molten steel processing is The cross-sectional shape of the long axis X1 and the short axis X2
The pair of reflux tubes are arranged in the long axis direction of the bottom, and the long axis X1 and the short axis X2 satisfy the following formula: 0.4≦X2 /X1≦0.9 The present invention provides an RH degassing device characterized by having a structure in which:
【００１０】また、本発明は、好ましくは、環流管の軸
心と環流管の胴部内壁との間の最短距離をＲ１ とし、
環流管の内半径をＲ２ とした場合に、下記式０．５≦
Ｒ２ ／Ｒ１ ≦１．０
を満足させる構造とするのがよい。Further, in the present invention, preferably, the shortest distance between the axis of the reflux tube and the inner wall of the body of the reflux tube is R1,
When the inner radius of the circulation pipe is R2, the following formula 0.5≦
It is preferable to have a structure that satisfies R2/R1≦1.0.
【００１１】さらにまた本発明のＲＨ脱ガス装置は、槽
の断面積Ｓ１ と環流管の合計断面積Ｓ２ に関して下
記式０．２≦Ｓ２ ／Ｓ１
を満足させる構造とするのが好ましい。Furthermore, the RH degassing apparatus of the present invention preferably has a structure that satisfies the following formula 0.2≦S2/S1 with respect to the cross-sectional area S1 of the tank and the total cross-sectional area S2 of the reflux tube.
【００１２】0012
【作用】本発明は環流する溶鋼の反応面がある下部の脱
ガス槽の形状を変えるとともに、下部の脱ガス槽と環流
管との相対配置を適切にすることによって、脱ガス槽を
循環する溶鋼の停滞をなくすとともに槽内でのスラグの
滞留を防ぐ。このことによって環流する溶鋼の反応面に
おける脱炭反応や脱水素反応の反応速度を増す。[Operation] The present invention circulates the molten steel through the degassing tank by changing the shape of the lower degassing tank where the reaction surface is located and by optimizing the relative arrangement of the lower degassing tank and the reflux pipe. Eliminates stagnation of molten steel and prevents slag from accumulating in the tank. This increases the reaction rate of the decarburization reaction and dehydrogenation reaction on the reaction surface of the circulating molten steel.
【００１３】さらに詳細に説明すると、本発明者が、３
００ｔ規模の１／５縮尺のＲＨ水モデル実験で目視観察
を行ったところ、通常の円形の脱ガス槽に比べて、下部
の脱ガス槽（図２参照）の横断面が長軸をＸ１ 、短軸
をＸ２ （図３参照）とし、かつＸ２ ／Ｘ１ が０．
４〜０．９となる長円形の脱ガス槽の底部の、長軸方向
に一対の環流管を配置した構造の脱ガス槽は、短軸方向
にも殆ど水の停滞もなく、しかも、スラグの代用として
使用した発砲スチロールの脱ガス槽内での滞留も見られ
なかった。ここで長軸方向とは下部の脱ガス槽の胴部断
面の最長距離方向を意味し、短軸方向とはその直交方向
を意味するものとする。[0013] To explain in more detail, the present inventor has
Visual observation in a 1/5 scale RH water model experiment of the 00t scale revealed that, compared to a normal circular degassing tank, the cross section of the lower degassing tank (see Figure 2) has a long axis at X1, The short axis is X2 (see Figure 3), and X2 /X1 is 0.
The degassing tank has a structure in which a pair of reflux tubes are arranged in the long axis direction at the bottom of the oval degassing tank with a diameter of 4 to 0.9, and there is almost no stagnation of water in the short axis direction. No retention of styrene foam, which was used as a substitute, in the degassing tank was observed. Here, the long axis direction means the longest distance direction of the cross section of the body of the lower degassing tank, and the short axis direction means the direction perpendicular thereto.
【００１４】一方、通常の円形の脱ガス槽の形を大きく
しても水の停滞の度合いや発砲スチロールの滞留は小径
の脱ガス槽とほぼ同様であった。このことから、スムー
ズな溶鋼流れを起こさせるには、下部の脱ガス槽の胴部
断面形状をＸ２ ／Ｘ１ のが０．４〜０．９となる長
円形状とし、長軸方向に環流管を配置させることが有効
であることが分かった。逆に、Ｘ２ ／Ｘ１ の比が０
．４未満または０．９超であると、溶鋼流の停滞が局部
的に起こり脱炭速度を低下させるおそれがある。。On the other hand, even if the shape of the ordinary circular degassing tank was enlarged, the degree of water stagnation and retention of styrene foam were almost the same as in a small diameter degassing tank. From this, in order to cause smooth flow of molten steel, the cross-sectional shape of the body of the lower degassing tank should be an oval shape with X2 / It was found that it is effective to place Conversely, if the ratio of X2 /X1 is 0
．． If it is less than 4 or more than 0.9, stagnation of the molten steel flow may occur locally, which may reduce the decarburization rate. .
【００１５】さらに、この長円形状の脱ガス槽において
は、環流管をできるだけ長軸方向の胴部内壁に近づけた
方がスムーズな溶鋼流となり、槽内でのスラグの滞留も
なくなる。すなわち、環流管の軸心から近接の胴部内壁
までの最短距離をＲ１ とし、環流管の半径をＲ２ と
すると、Ｒ２ ／Ｒ１ の比が０．５〜１．０のときに
溶鋼流がスムーズに流れる。逆に、Ｒ２ ／Ｒ１ の比
が０．５未満または１．０超であると、溶鋼流の流れが
悪くなり、脱炭速度が低下する。Furthermore, in this oval degassing tank, if the reflux tube is placed as close as possible to the inner wall of the body in the longitudinal direction, the molten steel will flow more smoothly and slag will not accumulate in the tank. In other words, if the shortest distance from the axis of the reflux tube to the adjacent inner wall of the body is R1, and the radius of the reflux tube is R2, the molten steel will flow smoothly when the ratio of R2/R1 is 0.5 to 1.0. flows to On the other hand, if the R2/R1 ratio is less than 0.5 or more than 1.0, the flow of the molten steel becomes poor and the decarburization rate decreases.
【００１６】また、本発明による長円形状の脱ガス槽に
おいては、下部の脱ガス槽の胴部断面積Ｓ１ に対する
環流管の全断面積Ｓ２ の比（Ｓ２ ／Ｓ１ ）が大き
いほど、すなわち０．２以上の場合に脱ガス槽内の溶鋼
やスラグの滞留が見られなくなることも分かった。ただ
し、環流管の全断面積とは、環流管全体の断面積を意味
し、例えば環流管が２本の場合にはそれらを合わせた面
積を意味するものとする。Furthermore, in the oval degassing tank according to the present invention, the larger the ratio (S2/S1) of the total cross-sectional area S2 of the reflux pipe to the body cross-sectional area S1 of the lower degassing tank, that is, 0. It was also found that molten steel and slag retention in the degassing tank was no longer observed when the value was 2 or more. However, the total cross-sectional area of the reflux tube means the cross-sectional area of the entire reflux tube, and for example, in the case of two reflux tubes, it means the combined area of the reflux tubes.
【００１７】このように、本発明によれば、効果的な溶
鋼の環流速度と反応界面面積の増大が図れるので、反応
速度を高めることができる。なお、本発明において脱ガ
ス槽（上部槽）に対して取鍋内に収まる範囲で極力大き
な下部槽としても反応速度の増加が図れることは言うま
でもない。As described above, according to the present invention, it is possible to effectively increase the molten steel reflux rate and the reaction interface area, so that the reaction rate can be increased. It goes without saying that in the present invention, the reaction rate can be increased even if the lower tank is as large as possible within the ladle compared to the degassing tank (upper tank).
【００１８】[0018]
【実施例】本発明の実施例を以下に具体的に説明する。EXAMPLES Examples of the present invention will be specifically described below.
【００１９】まず、約３００ｔの溶鋼をＲＨ脱ガス槽で
脱炭処理した。溶鋼の初期条件は、Ｃ：０．０３〜０．
０５重量％，Ｍｎ：０．１〜０．２重量％，Ｐ：０．０
２５〜０．０３重量％，Ｓ：０．００５〜０．００６重
量％，Ｏ：０．０７〜０．０８重量％であり、温度は１
６００〜１６１０℃であり、リムド状態で２０分間、Ａ
ｌ投入後キルド処理を１０分行った。First, about 300 tons of molten steel was decarburized in an RH degassing tank. The initial conditions of molten steel are C: 0.03 to 0.
05% by weight, Mn: 0.1-0.2% by weight, P: 0.0
25-0.03% by weight, S: 0.005-0.006% by weight, O: 0.07-0.08% by weight, and the temperature was 1
A temperature of 600 to 1610°C for 20 minutes in a rimmed state.
After adding l, a kill process was performed for 10 minutes.
【００２０】このときの下部の脱ガス槽の横断面形状は
図２に示すように、長円形状であり、各寸法は、長円の
長軸Ｘ１ が２．６〜３．０ｍの範囲，短軸Ｘ２ が１
．２〜２．６ｍ，脱ガス槽の内壁面までの距離Ｒ１ が
０．４４５〜０．７ｍの範囲，環流管の内半径Ｒ２ が
０．３〜０．５ｍの範囲，脱ガス槽の胴部内側断面の面
積Ｓ１ が２．８〜５．５３ｍ２ の範囲，環流管２つ
の断面積Ｓ２ が０．５６〜１．５７ｍ２ の範囲の内
から表１のような種々の値にてＲＨ処理後の炭素濃度を
調べた。The cross-sectional shape of the lower degassing tank at this time is an ellipse as shown in FIG. Minor axis X2 is 1
．． 2 to 2.6 m, the distance R1 to the inner wall of the degassing tank is in the range of 0.445 to 0.7 m, the inner radius R2 of the reflux pipe is in the range of 0.3 to 0.5 m, the body of the degassing tank After RH treatment at various values as shown in Table 1, the inner cross-sectional area S1 is in the range of 2.8 to 5.53 m2, and the cross-sectional area S2 of the two reflux tubes is in the range of 0.56 to 1.57 m2. Carbon concentration was investigated.
【００２１】これらの結果は表１にて実施例および比較
例として示されている。なお、表中、Ｘ１ は下部の脱
ガス槽の胴部の長軸方向の距離（ｍ）を、Ｘ２ は前記
胴部の短軸方向の距離（ｍ）を、Ｒ１ は環流管内側の
半径（ｍ）を、Ｓ１ は下部の脱ガス槽の断面積（ｍ２
）を、Ｓ２ は環流管の合計断面積（ｍ２ ）をそれ
ぞれ示すものとする。These results are shown in Table 1 as Examples and Comparative Examples. In the table, X1 is the distance (m) in the long axis direction of the body of the lower degassing tank, X2 is the distance (m) in the short axis direction of the body, and R1 is the radius (inside the reflux tube). m), S1 is the cross-sectional area of the lower degassing tank (m2
), and S2 represents the total cross-sectional area (m2) of the reflux tube, respectively.
【表１】[Table 1]
【００２２】表１から下部脱ガス槽の形状に関して０．
４≦Ｘ２ ／Ｘ１ ≦０．９
での到達炭素濃度が他の下部脱ガス槽の形状に比べて６
〜１１ｐｐｍと低く、さらに、０．５≦Ｒ２ ／Ｒ１
≦１．０および０．２≦Ｓ２ ／Ｓ１ のいずれか一方
または両条件が満足すると、さらに到達炭素濃度が低く
なることを確かめた（表１中の実施例■および■参照）
。From Table 1, the shape of the lower degassing tank is 0.
The carbon concentration reached at 4≦X2 /X1≦0.9 is 6 compared to other lower degassing tank shapes.
It is as low as ~11 ppm, and furthermore, 0.5≦R2/R1
It was confirmed that when one or both of the conditions ≦1.0 and 0.2≦S2 /S1 were satisfied, the carbon concentration reached was further reduced (see Examples ■ and ■ in Table 1).
.
【００２３】上述したように、本発明では、下部脱ガス
槽と環流管の形状ならびに相対位置を適切に定めれば、
脱炭速度の大幅な向上と到達炭素濃度の大幅な低下が可
能となる。As described above, in the present invention, if the shapes and relative positions of the lower degassing tank and the reflux pipe are appropriately determined,
It is possible to significantly improve the decarburization rate and significantly reduce the carbon concentration achieved.
【００２４】本発明を主に脱炭についての実施例で説明
したが、この他にも脱水素や脱酸素などの脱ガスに使用
しても同様な効果を奏することはもちろんである。[0024] Although the present invention has been explained mainly with respect to decarburization, it goes without saying that the same effect can be obtained when the present invention is used for other degassing purposes such as dehydrogenation and deoxidation.
【００２５】[0025]
【発明の効果】以上の説明からわかるように、本発明に
よれば、環流する溶鋼の反応面がある下部の脱ガス槽の
形状を所定形状に変えるとともに、下部の脱ガス槽と環
流管との相対配置を適切にすることによって、脱ガス槽
を循環する溶鋼の停滞をなくすとともに槽内でのスラグ
の滞留を防ぐ。このことによって環流する溶鋼の反応面
における脱炭反応や脱水素反応の反応速度を増し、到達
される炭素濃度や水素濃度の大幅な低下が可能となる。As can be seen from the above description, according to the present invention, the shape of the lower degassing tank where the reaction surface of circulating molten steel is located is changed to a predetermined shape, and the lower degassing tank and the reflux pipe are By optimizing the relative arrangement of the degassing tank, stagnation of molten steel circulating in the degassing tank can be eliminated, and slag retention in the tank can be prevented. This increases the reaction rate of the decarburization reaction and dehydrogenation reaction on the reaction surface of the circulating molten steel, making it possible to significantly reduce the achieved carbon and hydrogen concentrations.
【図１】 ＲＨ脱ガス装置を示す概略的な断面図であ
る。FIG. 1 is a schematic cross-sectional view showing an RH degassing device.
【図２】 下部脱ガス槽の外観を示す概観図である。FIG. 2 is an overview diagram showing the appearance of the lower degassing tank.
【図３】 図２に示した下部脱ガス槽のＡ−Ａ’線上
の断面図であり、下部脱ガス槽の胴部断面形状および環
流管の形状およびそれらの関係を示す線図である。3 is a sectional view taken along the line AA' of the lower degassing tank shown in FIG. 2, and is a diagram showing the cross-sectional shape of the body of the lower degassing tank, the shape of the reflux pipe, and the relationship therebetween.
３ 上部脱ガス槽 ４ 下部脱ガス槽 ５ 環流管 ６ フランジ部 ７ 浸漬管 ８ 取鍋 ９ 環流ガス導入配管 １０ 溶鋼 3 Upper degassing tank 4 Lower degassing tank 5 Circulation pipe 6 Flange part 7. Dip tube 8 Ladle 9 Reflux gas introduction piping 10 Molten steel
Claims (3)
内に浸漬させ、溶鋼を該環流管を通して槽内に循環させ
るＲＨ脱ガス装置において、溶鋼処理中に溶鋼と接触す
る部位の槽の横断面形状を長軸Ｘ１ と短軸Ｘ２ とか
ら成る長円形状となし、前記一対の環流管を前記底部の
長軸方向に配設し、長軸Ｘ１ と短軸Ｘ２ とが下記式
０．４≦Ｘ２ ／Ｘ１ ≦０．９ を満足する構造としたことを特徴とするＲＨ脱ガス装置
。Claim 1: In an RH degassing device in which a pair of reflux pipes are immersed in molten steel in a ladle from the bottom of the tank, and the molten steel is circulated into the tank through the reflux pipes, the tank is a part of the tank that comes into contact with molten steel during molten steel processing. The cross-sectional shape of is an elliptical shape consisting of a long axis X1 and a short axis X2, the pair of reflux tubes are arranged in the long axis direction of the bottom, and the long axis X1 and short axis X2 are expressed by the following formula 0. .4≦X2 /X1≦0.9 A RH degassing device characterized by having a structure that satisfies the following.
て、環流管の軸心と環流管の胴部内壁との間の最短距離
をＲ１ とし、環流管の内半径をＲ２ とした場合に、
下記式 ０．５≦Ｒ２ ／Ｒ１ ≦１．０ を満足させる構造としたＲＨ脱ガス装置。2. In the RH degassing device according to claim 1, when the shortest distance between the axis of the reflux tube and the inner wall of the body of the reflux tube is R1, and the inner radius of the reflux tube is R2,
An RH degassing device having a structure that satisfies the following formula: 0.5≦R2 /R1≦1.0.
ガス装置において、槽の断面積Ｓ１ と環流管の合計断
面積Ｓ２ に関して下記式 ０．２≦Ｓ２ ／Ｓ１ を満足させる構造としたＲＨ真空脱ガス装置。3. The RH degasser according to claim 1 or 2, wherein the RH degasser has a structure that satisfies the following formula 0.2≦S2 /S1 with respect to the cross-sectional area S1 of the tank and the total cross-sectional area S2 of the reflux pipe. Vacuum degassing equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3010091A JP2880810B2 (en) | 1991-02-25 | 1991-02-25 | RH degasser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3010091A JP2880810B2 (en) | 1991-02-25 | 1991-02-25 | RH degasser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04272120A true JPH04272120A (en) | 1992-09-28 |
| JP2880810B2 JP2880810B2 (en) | 1999-04-12 |
Family
ID=12294361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3010091A Expired - Fee Related JP2880810B2 (en) | 1991-02-25 | 1991-02-25 | RH degasser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2880810B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04314818A (en) * | 1991-02-20 | 1992-11-06 | Kawasaki Steel Corp | Vacuum degassing apparatus and production of extremely low carbon steel using this apparatus |
| WO2022009630A1 (en) | 2020-07-09 | 2022-01-13 | Ｊｆｅスチール株式会社 | Method for refining molten steel |
| KR20230006904A (en) | 2020-07-09 | 2023-01-11 | 제이에프이 스틸 가부시키가이샤 | How to refine molten steel |
-
1991
- 1991-02-25 JP JP3010091A patent/JP2880810B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04314818A (en) * | 1991-02-20 | 1992-11-06 | Kawasaki Steel Corp | Vacuum degassing apparatus and production of extremely low carbon steel using this apparatus |
| WO2022009630A1 (en) | 2020-07-09 | 2022-01-13 | Ｊｆｅスチール株式会社 | Method for refining molten steel |
| KR20230006904A (en) | 2020-07-09 | 2023-01-11 | 제이에프이 스틸 가부시키가이샤 | How to refine molten steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2880810B2 (en) | 1999-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5520373A (en) | Steelmaking degassing apparatus | |
| JPH04272120A (en) | Rh degasifier | |
| JP2007031820A (en) | Vacuum-degassing treating method for molten steel | |
| JP3843589B2 (en) | Melting method of high nitrogen stainless steel | |
| JP2582316B2 (en) | Melting method of low carbon steel using vacuum refining furnace | |
| JPS63143216A (en) | Melting method for extremely low carbon and low nitrogen steel | |
| JP3891013B2 (en) | Method of refining molten steel with RH degassing equipment | |
| JPH11293329A (en) | Production of extra-low carbon silicon-killed steel excellent in cleaning property | |
| JP2648769B2 (en) | Vacuum refining method for molten steel | |
| JP3539740B2 (en) | Molten steel desulfurization method and vacuum degassing tank in reflux vacuum degassing tank | |
| JPH07268444A (en) | Recirculation type vacuum degassing apparatus | |
| JPH08109410A (en) | Finish decarburization refining of stainless steel | |
| JP3842857B2 (en) | RH degassing method for molten steel | |
| JPH08302419A (en) | Refining method of molten steel | |
| JP2819424B2 (en) | Manufacturing method of ultra-low carbon steel | |
| JPH09143546A (en) | Oxygen top blowing method in rh degassing equipment | |
| JPH06212243A (en) | Production of high cleanliness molten steel | |
| JPH07224314A (en) | Production of al-free deoxidized steel utilizing co deoxidation | |
| JPH02267213A (en) | Method for vacuum-decarbonizing molten steel | |
| JPH11293331A (en) | Refining of molten steel | |
| JPH0565528A (en) | Melting production of high cleanliness steel | |
| JPH10330829A (en) | Method for melting high cleanliness extra-low carbon steel | |
| JP2001158910A (en) | Vacuum refining method for molten steel | |
| JPH08311531A (en) | Gas bubbling method in rh vacuum vessel | |
| JPH0243315A (en) | Method and device for reflux type degassing treatment of molten steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19990119 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080129 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090129 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090129 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100129 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110129 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |