JPH01198418A - Apparatus and method for vacuum degassing molten steel - Google Patents
Apparatus and method for vacuum degassing molten steelInfo
- Publication number
- JPH01198418A JPH01198418A JP2175888A JP2175888A JPH01198418A JP H01198418 A JPH01198418 A JP H01198418A JP 2175888 A JP2175888 A JP 2175888A JP 2175888 A JP2175888 A JP 2175888A JP H01198418 A JPH01198418 A JP H01198418A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- vacuum degassing
- tube
- ladle
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000009849 vacuum degassing Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 22
- 238000007664 blowing Methods 0.000 claims abstract description 17
- 238000007654 immersion Methods 0.000 claims description 22
- 238000010992 reflux Methods 0.000 claims description 20
- 238000007872 degassing Methods 0.000 abstract description 21
- 230000000630 rising effect Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 32
- 238000003756 stirring Methods 0.000 description 8
- 230000001174 ascending effect Effects 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、環流式真空脱ガス法により高効率で溶鋼を
真空脱ガス処理する設備および方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to equipment and a method for highly efficiently vacuum degassing molten steel by a recirculation vacuum degassing method.
（従来の技術およびその課！１１）
近年、転炉で溶製された溶鋼に対して真空脱ガスを施し
、高級鋼を製造することが著しく多くなった。(Prior art and its section! 11) In recent years, the production of high-grade steel by subjecting molten steel produced in a converter to vacuum degassing has significantly increased.
真空脱ガス法には、ＲＨ法、Ｄｌｌ法、ｖＯＤ法などが
あるが、前記Ｒ１＋真空脱ガス法は、
（１）−度に多量の溶鋼処理ができる、（２）溶鋼の脱
酸、脱水素等の脱ガスのみならず、低炭素鋼や清浄鋼の
製造に通している、
（３）合金鉄の使用により成分の微調整ができる、など
、他の真空脱ガス法が及ばない優れた点を有している。Vacuum degassing methods include the RH method, Dll method, vOD method, etc., but the R1+ vacuum degassing method is capable of (1) processing a large amount of molten steel at a time, and (2) deoxidizing and dehydrating molten steel. It has advantages that other vacuum degassing methods cannot match, such as not only degassing raw materials but also producing low carbon steel and clean steel. (3) Fine adjustment of the composition by using ferroalloy. It has points.
さて、従来のＲＨ真空脱ガス法の概要を第２図を用いて
説明する。Now, an outline of the conventional RH vacuum degassing method will be explained using FIG. 2.
第２図において、ｌは図示しない真空ポンプに接続され
た真空脱ガス槽である。この脱ガス槽ｌは、その下部に
一本の上昇管２ａと一本の下降管２ｂとを備え、前記上
昇管２ａの中間部には、Ａｒガス等を吹き込む環流ガス
吹き込み口３が°設けられている。In FIG. 2, l is a vacuum degassing tank connected to a vacuum pump (not shown). This degassing tank l is equipped with one rising pipe 2a and one descending pipe 2b at its lower part, and a reflux gas blowing port 3 for blowing Ar gas etc. is provided in the middle part of the rising pipe 2a. It is being
このようなＲＨ装置により溶鋼の脱ガスを行うには、溶
８４を満たした取鍋５を脱ガス槽１の下方に配置し、そ
のあと脱ガス槽１を下降して上昇管２ａと下降管２ｂを
取鍋５内の溶鋼４に浸漬する。To degas molten steel using such an RH device, the ladle 5 filled with molten steel 84 is placed below the degassing tank 1, and then the degassing tank 1 is lowered to connect the ascending pipe 2a and the descending pipe. 2b is immersed in the molten steel 4 in the ladle 5.
そして、真空ポンプにより脱ガス槽１内を減圧して溶鋼
４を吸い上げると同時に、前記環流ガス吹き込み口３か
らＡｒガスを吹き込み、Ａｒガスの上昇流により上昇管
２ａ内に溶鋼流を生じさせ、取鍋５内溶ｌ１１４を脱ガ
ス槽１に流入する。脱ガス槽ｌ内に流入したｔｌｊ鋼４
は部分脱ガスされたあと、下降管２ｂを通じて取鍋５内
に環流される。通常、このような操業を２０〜３０分連
続して行うことによって、取鍋的全体の溶！１ｔ１４が
脱ガスされ、所望成分の溶鋼が製造されるのである。Then, the pressure inside the degassing tank 1 is reduced by a vacuum pump to suck up the molten steel 4, and at the same time, Ar gas is blown in from the circulating gas blowing port 3 to cause a molten steel flow in the rising pipe 2a due to the upward flow of the Ar gas, The melt l114 in the ladle 5 flows into the degassing tank 1. tlj steel 4 flowing into the degassing tank l
After being partially degassed, it is refluxed into the ladle 5 through the downcomer pipe 2b. Normally, by performing this operation continuously for 20 to 30 minutes, the entire melt in the ladle is melted! 1t14 is degassed and molten steel with desired composition is produced.
さて、最近の極低炭素鋼等高級鋼の需要の増加に伴って
溶鋼の脱ガス処理量も増大しているが、処理能力が低い
ために対応できない状況にある。Now, with the recent increase in demand for high-grade steels such as ultra-low carbon steel, the amount of molten steel degassed has also increased, but this cannot be handled due to low processing capacity.
そこで、処理能力向上のため、上昇管および下降管の管
径の拡大や環流ガスの増量等の方法で対処している。Therefore, in order to improve processing capacity, measures such as increasing the diameters of the rising and descending pipes and increasing the amount of recirculated gas are being taken.
しかし、これらの対策を行っても、例えば、溶鋼中（Ｃ
）を２００１）ｐＨから１５〜２０ｐｐｍまで低減する
のに１５〜２５分を要し、１５分以内にするという目標
には達していない、以下、その原因について、第２図を
用いて説明する。However, even if these measures are taken, for example, molten steel (C
2001) It takes 15 to 25 minutes to reduce the pH to 15 to 20 ppm, and the goal of reducing the pH within 15 minutes has not been achieved.The reason for this will be explained below using FIG. 2.
第２図において、環流ガス吹き込み口３から吹き込まれ
たＡｒガスにより、溶鋼４は脱ガス槽１内に流入し、脱
ガスされ、下降管２ｂを通って取鍋５内に環流するので
あるが、下降管２ｂから排出された脱ガス後の溶鋼は、
取締自溶鋼４に均一に分散混合せず、同図中矢印で示す
ように、直ちに上昇管２ａに向かって流れる短絡流を形
成する。In FIG. 2, molten steel 4 flows into the degassing tank 1 by Ar gas blown from the reflux gas inlet 3, is degassed, and then refluxes into the ladle 5 through the downcomer pipe 2b. , the degassed molten steel discharged from the downcomer pipe 2b is
It is not uniformly dispersed and mixed in the controlled self-melting steel 4, and forms a short-circuit flow that immediately flows toward the riser pipe 2a, as shown by the arrow in the figure.
このような短絡流が生ずる結果、下降管２ｂと取鍋５と
の間には（Ｃ）濃度希薄部Ａが、上昇管２ａと取Ｍ４５
との間には（Ｃ〕濃度濃縮部Ｂが貯留し、この貯留が存
在するために処理時間の短縮が図れないことが分かった
。As a result of such a short-circuit flow, there is a (C) diluted concentration area A between the downcomer pipe 2b and the ladle 5, and there is a thin concentration area A between the downcomer pipe 2b and the ladle M45.
It was found that (C) the concentration concentrating section B was stored between the two, and that the presence of this storage made it impossible to shorten the processing time.
そこで、上記の貯留部を解消するため、取鍋内溶鋼を攪
拌する方法が提案されている０例えば、特開昭５７−２
００５１４号公報に開示された方法もその一つである。Therefore, in order to eliminate the above-mentioned storage area, a method of stirring the molten steel in the ladle has been proposed.
The method disclosed in Publication No. 00514 is one of them.
この方法は第３図に示すように、取鍋５の底部の上昇管
２ａの直下の位置に、攪拌用ガス吹き込みノズル７を設
け、このノズル７からＡｒ等の攪拌ガスを吹き込むので
ある。そうすると、攪拌ガスの上昇流によって、図中矢
印で示すような取鍋底部を大きく回流する溶鋼流が生ず
るので、短絡流が発生せず、溶鋼環流率が向上して処理
時間の短縮が図れる。In this method, as shown in FIG. 3, a stirring gas blowing nozzle 7 is provided at the bottom of the ladle 5 at a position directly below the riser pipe 2a, and a stirring gas such as Ar is blown through the nozzle 7. In this case, the upward flow of the stirring gas generates a molten steel flow that circulates around the bottom of the ladle as shown by the arrow in the figure, so no short circuit flow occurs, the molten steel circulation rate improves, and the processing time can be shortened.
しかし、この方法では、取鍋底部から吹き込まれた攪拌
ガスの全部を上昇管２ａ内に収容することは難しく、上
昇管２ａ内に収納されなかった一部の攪拌ガスは、さら
に浮上して溶鋼表面を覆っているスラグ６を攪拌する。However, with this method, it is difficult to store all of the stirring gas blown from the bottom of the ladle into the riser pipe 2a, and some of the stirring gas that is not stored in the riser pipe 2a further floats to the surface of the molten steel. The slag 6 covering the surface is stirred.
このスラグ６の攪拌によって、スラグ−メタル反応を引
き起こし、スラグ中のＰ、 Ｓ、 Ｏ，Ｈ等の不純元素
？鋼中に溶解することになり、溶鋼汚染を起こすなどの
新たな問題が出現した。This stirring of the slag 6 causes a slag-metal reaction, and impurity elements such as P, S, O, and H in the slag. New problems have emerged, such as melting into the steel and causing molten steel contamination.
（！１１題を解決するための手段）
この発明は、上記問題点を解消するために成されたもの
であって、その要旨は「環流式真空脱ガス設備において
、真空脱ガス槽の下部に複数個の浸漬管が設けてあり、
これらの全ての管の長さ方向の中間部に環流ガス吹き込
み口を有することを特徴とする溶鋼の真空脱ガス設備、
および前記真空脱ガス設備の浸漬管を取鍋内溶鋼に浸漬
し、任意の位置と数の前記浸漬管から環流ガスを吹き込
んで溶鋼に上昇流をつくり、残りの浸漬管から溶鋼を下
降させ、所定の時間後に環流ガスを吹き込む浸漬管の位
置と数を変化させることにより溶鋼流の方向を変化させ
ることを特徴とする溶鋼の真空脱ガス方法」にある。(Means for Solving!11 Problems) This invention was made to solve the above problems, and the gist is ``In a recirculation type vacuum degassing equipment, the lower part of the vacuum degassing tank is Multiple dip tubes are provided,
Vacuum degassing equipment for molten steel, characterized by having a reflux gas inlet in the longitudinally intermediate part of all these pipes,
and immersing the immersion tubes of the vacuum degassing equipment into the molten steel in the ladle, blowing reflux gas through arbitrary positions and numbers of the immersion tubes to create an upward flow in the molten steel, and descending the molten steel from the remaining immersion tubes; A method for vacuum degassing of molten steel, characterized in that the direction of the flow of molten steel is changed by changing the position and number of immersion tubes into which circulating gas is blown after a predetermined period of time.
（作用）
全ての浸漬管に環流ガス吹き込み口を設けることにより
、溶鋼流の上昇管と下降管を任意に選定・変化させるこ
とができるから、溶鋼の貯留部が生じないようにするこ
とができ、脱ガス速度を促進させることができる。以下
、この発明の真空脱ガス設備および脱ガス方法について
、第１図を用いて説明する。(Function) By providing circulating gas inlets in all the immersion pipes, the ascending pipes and descending pipes for the molten steel flow can be selected and changed at will, making it possible to prevent the formation of molten steel reservoirs. , which can accelerate the degassing rate. Hereinafter, the vacuum degassing equipment and degassing method of the present invention will be explained using FIG. 1.
第１図は浸漬管が２本の場合の例示であって、ｌは真空
脱ガス槽、２＾および２Ｂは浸漬管、３Ａおよび３Ｂは
環流ガス吹き込み口、４は溶鋼、５は取鍋である。なお
、本発明では、浸漬管は複数本であって、例えば４本と
する場合、任意の２本を上昇管、他の２本を下降管とし
て使用する。Figure 1 shows an example of two immersion tubes, where l is a vacuum degassing tank, 2^ and 2B are immersion tubes, 3A and 3B are reflux gas inlets, 4 is molten steel, and 5 is a ladle. be. In the present invention, if there are a plurality of immersion pipes, for example four, any two of them are used as ascending pipes and the other two are used as descending pipes.
このような構成からなる装置により、本発明法を実施す
るには、溶鋼４を受鋼した取鍋５を真空脱ガス槽ｌの直
下に配置した後、前記脱ガス槽ｌを下方に移動して浸漬
管２Ａおよび２Ｂを溶鋼４中に挿入する。同時に脱ガス
槽１内を真空ポンプにより減圧し、溶ｍ４を再浸漬管を
通じて脱ガス槽１内に吸い上げる。In order to carry out the method of the present invention using an apparatus having such a configuration, the ladle 5 receiving the molten steel 4 is placed directly below the vacuum degassing tank l, and then the degassing tank l is moved downward. and insert the dip tubes 2A and 2B into the molten steel 4. At the same time, the pressure inside the degassing tank 1 is reduced by a vacuum pump, and the melt m4 is sucked up into the degassing tank 1 through the re-immersion pipe.
このような状態において、まづ浸漬管２Ａの中間部に設
けられた環流ガス吹き込み口３ＡからＡｒガス等の環流
ガスを吹き込む。In such a state, first, a reflux gas such as Ar gas is blown in from the reflux gas blowing port 3A provided in the middle of the immersion tube 2A.
そうすると、環流ガスの上昇によって浸漬管２Ａ内に、
図中実線矢印で示すような溶鋼流が生じ、取鍋５内溶鋼
４が脱ガス槽１内に流入する。流入した溶鋼４は槽内で
脱ガスされたあと、図中実線矢印で示すように浸漬管２
Ｂを介して取鍋５に戻される。この操業を所定時間継続
したあと、環流ガス吹き込み口３Ａからのガスの吹き込
みを止める。Then, due to the rise of the reflux gas, inside the immersion tube 2A,
A molten steel flow as shown by the solid arrow in the figure is generated, and the molten steel 4 in the ladle 5 flows into the degassing tank 1. After the inflowing molten steel 4 is degassed in the tank, it flows into the immersion pipe 2 as shown by the solid arrow in the figure.
It is returned to the ladle 5 via B. After continuing this operation for a predetermined period of time, the blowing of gas from the recirculation gas blowing port 3A is stopped.
そして、今度は浸漬管２Ｂの環流ガス吹き込み口３Ｂか
ら環流ガスを吹き込むのである。そうすると、浸漬管２
Ｂ内に図中点線矢印で示すような上昇溶鋼流が生じ、溶
１１４は脱ガス槽ｌ内に流入する。流入溶鋼は脱ガス槽
ｌ内で脱ガスされたあと、浸漬管２Ａを通って取ｗ４５
に環流される。Then, the reflux gas is blown in from the reflux gas blowing port 3B of the immersion tube 2B. Then, dip tube 2
An upward flow of molten steel as shown by the dotted arrow in the figure is generated in B, and the molten steel 114 flows into the degassing tank l. After the inflowing molten steel is degassed in the degassing tank l, it is taken out through the immersion pipe 2A w45.
It is circulated to.
このように、環流ガスを交互に切り換えて吹き込むこと
により、取鍋５内の全体の溶鋼４が環流作用を起こすの
で、局所的な溶鋼の滞留が生じない、その結果、溶鋼環
流率が向上し、処理時間の短縮が図れるのである。In this way, by alternately switching and blowing the reflux gas, the entire molten steel 4 in the ladle 5 causes a reflux effect, so that local molten steel does not stagnate, and as a result, the molten steel reflux rate improves. , the processing time can be shortened.
ところで、上記のような吹き込みガスの切り換えは、浸
漬管が４本の場合、隣合わせの２本をグループとして上
昇管に、他を下降管としてもよく、相対する２本を上昇
管、他を下降管としてもよい。By the way, when switching the blowing gas as described above, when there are four immersion pipes, two adjacent pipes may be grouped as ascending pipes and the others may be used as descending pipes, or two opposing pipes may be used as ascending pipes and the others as descending pipes. It can also be used as a pipe.
これらの切り換えは、予め設定したプログラムにしかっ
て自動的に操作することもできる。その切り換え間隔は
６０秒以上とするのが好ましい、 ６０秒未満では、脱
ガス槽ｌ内で溶鋼流の流れの方向が変わる際に、淀みを
生ずる頻度が多くなり、環流率が低下するからである。These switching operations can also be performed automatically according to a preset program. It is preferable that the switching interval is 60 seconds or more; if it is less than 60 seconds, stagnation will occur more frequently when the flow direction of the molten steel changes in the degassing tank l, and the reflux rate will decrease. be.
（実施例）
本発明法により極低炭素鋼を製造し、脱ガス処理時間と
溶鋼中（Ｃ）の変化を調査した。(Example) Ultra-low carbon steel was manufactured by the method of the present invention, and changes in degassing treatment time and (C) in molten steel were investigated.
なお、本発明の効果を明確にするため、同等の条件で従
来法も実施した。その時の提言条件を第１表に示す。In order to clarify the effects of the present invention, a conventional method was also carried out under the same conditions. Table 1 shows the proposed conditions at that time.
（以下余白） 第１表 ＊片側の浸漬管のみ この結果を第４図に示す。(Margin below) Table 1 *One side dip tube only The results are shown in FIG.
第４図から分かるように、従来法では、当初溶鋼中［Ｃ
）濃度が２９５ｐｐｍあったものを１０ ｐｐｍまで低
減するのに１５分を要している。As can be seen from Figure 4, in the conventional method, initially in the molten steel [C
) It took 15 minutes to reduce the concentration from 295 ppm to 10 ppm.
これに対し、本発明法においては、当初（Ｃ）濃度２９
５ｐｐ−からＢｐｐ−にするのに１１分で行うことがで
き、従来法より約３０％短縮できた。In contrast, in the method of the present invention, the initial (C) concentration is 29
It took 11 minutes to change from 5pp- to Bpp-, which was about 30% shorter than the conventional method.
なお、上記操業では、溶鋼中（Ｃ１のみ調査したが、他
の調査では、酸素、水素、窒素等の脱ガスにも同様の効
果があることが確認されている。In addition, in the above operation, only C1 was investigated in molten steel, but other investigations have confirmed that degassing of oxygen, hydrogen, nitrogen, etc. has a similar effect.
（発明の効果）
上記説明したように、本発明法によれば、両方の浸漬管
に環流ガス吹き込み口を設け、交互に環流ガスを吹き込
むだけで、真空脱ガス処理時間を大幅に短縮でき、生産
性の向上が図られるとともに高級鋼の増産の要請にも十
分に応えられるようになった。(Effects of the Invention) As explained above, according to the method of the present invention, the vacuum degassing process time can be significantly shortened by simply providing reflux gas blowing ports in both immersion tubes and blowing reflux gas alternately. Not only has productivity been improved, but the company has also been able to fully meet the demand for increased production of high-grade steel.
第１図は本発明を実施する真空脱ガス装置の概略図、
第２図は従来の真空脱ガス装置の図、
第３図は従来の取鍋底部に攪拌ガスを有する真空脱ガス
装置の図、
第４図は本発明法と従来法の真空脱ガス処理時間と溶鋼
中（Ｃ）の変化を示す図、である。
１は真空脱ガス槽、２Ａ、２Ｂは浸漬管、２ａは上昇管
、２ｂは下降管、３．３Ａ、３Ｂは環流ガス吹き込み口
、４は溶鋼、５は取鍋、６はスラグ、Fig. 1 is a schematic diagram of a vacuum degassing device implementing the present invention, Fig. 2 is a diagram of a conventional vacuum degassing device, and Fig. 3 is a diagram of a conventional vacuum degassing device having a stirring gas at the bottom of a ladle. , FIG. 4 is a diagram showing the vacuum degassing treatment time and the change in molten steel (C) in the method of the present invention and the conventional method. 1 is a vacuum degassing tank, 2A and 2B are immersion pipes, 2a is a rising pipe, 2b is a descending pipe, 3.3A and 3B are reflux gas inlets, 4 is molten steel, 5 is a ladle, 6 is slag,
Claims (2)
下部に複数個の浸漬管が設けてあり、これらの全ての管
の長さ方向の中間部に環流ガス吹き込む口を有すること
を特徴とする溶鋼の真空脱ガス設備。(1) A recirculation type vacuum degassing equipment is characterized in that a plurality of immersion pipes are provided at the bottom of the vacuum degassing tank, and all of these pipes have an opening for blowing the recirculation gas into the middle part in the length direction. Vacuum degassing equipment for molten steel.
溶鋼に浸漬し、任意の位置と数の前記浸漬管から環流ガ
スを吹き込んで溶鋼に上昇流をつくり、残りの浸漬管か
ら溶鋼を下降させ、所定の時間後に環流ガスを吹き込む
浸漬管の位置と数を変化させることにより溶鋼流の方向
を変化させることを特徴とする溶鋼の真空脱ガス方法。(2) The immersion tube of the equipment described in claim 1 is immersed in molten steel in a ladle, and reflux gas is blown into the molten steel from arbitrary positions and numbers of immersion tubes to create an upward flow into the molten steel, and the remaining immersion tubes are A vacuum degassing method for molten steel, characterized in that the direction of the molten steel flow is changed by changing the position and number of immersion tubes that blow reflux gas into the molten steel after a predetermined period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2175888A JPH01198418A (en) | 1988-02-01 | 1988-02-01 | Apparatus and method for vacuum degassing molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2175888A JPH01198418A (en) | 1988-02-01 | 1988-02-01 | Apparatus and method for vacuum degassing molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01198418A true JPH01198418A (en) | 1989-08-10 |
Family
ID=12063961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2175888A Pending JPH01198418A (en) | 1988-02-01 | 1988-02-01 | Apparatus and method for vacuum degassing molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01198418A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011023337A1 (en) | 2009-08-28 | 2011-03-03 | Sms Siemag Aktiengesellschaft | Device for degassing molten steel with an improved discharge nozzle |
| CN106435094A (en) * | 2016-12-08 | 2017-02-22 | 中冶京诚工程技术有限公司 | RH method vacuum tank with lifting gas pipeline and arrangement method of lifting gas pipeline thereof |
-
1988
- 1988-02-01 JP JP2175888A patent/JPH01198418A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011023337A1 (en) | 2009-08-28 | 2011-03-03 | Sms Siemag Aktiengesellschaft | Device for degassing molten steel with an improved discharge nozzle |
| DE102009039260A1 (en) | 2009-08-28 | 2011-03-03 | Sms Siemag Ag | Apparatus for degassing a molten steel with an improved spout |
| CN106435094A (en) * | 2016-12-08 | 2017-02-22 | 中冶京诚工程技术有限公司 | RH method vacuum tank with lifting gas pipeline and arrangement method of lifting gas pipeline thereof |
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