JPH02228416A - Dip pipe for vacuum degasification device - Google Patents
Dip pipe for vacuum degasification deviceInfo
- Publication number
- JPH02228416A JPH02228416A JP4729189A JP4729189A JPH02228416A JP H02228416 A JPH02228416 A JP H02228416A JP 4729189 A JP4729189 A JP 4729189A JP 4729189 A JP4729189 A JP 4729189A JP H02228416 A JPH02228416 A JP H02228416A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- gas
- pipe
- downcomer
- vessel
- 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
- 238000007872 degassing Methods 0.000 title abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 37
- 239000011261 inert gas Substances 0.000 claims abstract description 9
- 238000007654 immersion Methods 0.000 claims description 24
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000011819 refractory material Substances 0.000 claims description 8
- 238000009849 vacuum degassing Methods 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 38
- 229910000831 Steel Inorganic materials 0.000 abstract description 34
- 239000010959 steel Substances 0.000 abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 19
- 238000007664 blowing Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 229910052786 argon Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004901 spalling Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- 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、溶鋼中のガス成分、特に、溶鋼中窒素（以
下、［Ｎ］という）を低減するための真空脱ガス装置の
浸漬管に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an immersion tube for a vacuum degassing device for reducing gas components in molten steel, particularly nitrogen (hereinafter referred to as [N]) in molten steel. .
［従来の技術］
近時、鋼材品質に対する要求は益々厳しく、従来の［Ｐ
］、［Ｓ］の低減化に加えて、ＣＮＩをも低減化した極
低窒素鋼等の高級鋼が脱ガス精錬により製造される傾向
にある。例えば、極低窒素鋼をＲＨ脱ガス槽により脱ガ
ス処理する場合は、脱ガス槽下部の１対の浸漬管を溶鋼
中に浸漬し、浸漬管により溶鋼を外気から遮断しつつ、
脱ガス処理する。[Conventional technology] Recently, requirements for steel material quality have become increasingly strict, and the conventional [P]
], [S], and high-grade steels such as ultra-low nitrogen steels with reduced CNI are now being produced by degassing refining. For example, when ultra-low nitrogen steel is degassed in an RH degassing tank, a pair of immersion tubes at the bottom of the degassing tank are immersed in the molten steel, and while the molten steel is isolated from the outside air by the immersion tube,
Degas.
ところで、極低窒素鋼の製造においては、［Ｎ］濃度の
要求レベルが２０ ｐｐ１１以下と極めて低いために、
処理系内を大気から遮断しているにもかかわらず微量の
大気が侵入し、窒素ピックアップを生じる。大気の侵入
経路は、主として浸漬管を覆う耐火物であ・る。一般に
、ち密な耐火物は耐スポーリング性に劣る。従って、浸
漬管外面は、耐スポーリング性に優れる高気孔率の高ア
ルミナ系キャスタブルで構成される。このため、浸漬管
外面の耐火物を大気が通過し易く、溶湯が汚染されるの
で、窒素ピックアップを防止するために従来から種々の
技術が開発されている。By the way, in the production of ultra-low nitrogen steel, the required level of [N] concentration is extremely low at 20 pp11 or less, so
Even though the inside of the processing system is isolated from the atmosphere, a small amount of air enters and causes nitrogen pickup. The main path for atmospheric intrusion is through the refractory covering the immersion pipe. In general, dense refractories have poor spalling resistance. Therefore, the outer surface of the dip tube is made of high alumina castable with high porosity and excellent spalling resistance. For this reason, the atmosphere tends to pass through the refractories on the outer surface of the immersion tube, contaminating the molten metal, so various techniques have been developed to prevent nitrogen pickup.
従来の脱ガス処理における窒素ピックアップ防止技術と
して、特開昭６０−１７４８１５号公報に記載された発
明がある。これによれば、浸漬管の先端近傍内部に不活
性ガスを吹込みつつ脱ガス処理するので、浸漬管を介し
て系内に大気が侵入しなくなるというものである。As a conventional technique for preventing nitrogen pickup in degassing treatment, there is an invention described in Japanese Patent Application Laid-Open No. 174815/1983. According to this, degassing is performed while blowing an inert gas into the interior near the tip of the immersion tube, so that air does not enter the system through the immersion tube.
［発明が解決しようとする課題］
しかしながら、従来の技術においては、浸漬管先端部の
溶損が進行すると、浸漬管内部に設けた不活性ガス通路
が損傷を受け、使用初期から末期に至るまで同じように
窒素ピックアップを防止することができない。[Problems to be Solved by the Invention] However, in the conventional technology, when the dissolution of the tip of the immersion tube progresses, the inert gas passage provided inside the immersion tube is damaged. Nitrogen pickup cannot be prevented in the same way.
極低窒素鋼の脱ガス処理において窒素ピックアップが生
じると、［Ｎ］を固定化するために金属チタン、ボロン
、ニオブ、バナジウム等の安定化剤を添加する。このた
め、コスト高を招いていた。When nitrogen pick-up occurs during degassing treatment of ultra-low nitrogen steel, a stabilizer such as metallic titanium, boron, niobium, vanadium, etc. is added to fix [N]. This has led to high costs.
この発明はかかる事情に鑑みてなされたものであって、
脱ガス処理溶湯の［Ｎ］を効率よく低減することができ
る真空脱ガス装置の浸漬管を提供することを目的とする
。This invention was made in view of such circumstances, and
It is an object of the present invention to provide an immersion tube for a vacuum degassing device that can efficiently reduce [N] in a degassed molten metal.
［課題を解決するための手段］
発明者等は、ＲＨ脱ガス槽の場合は下降管において大気
の侵入が著しいことを経験的に見出だしている。これは
、上昇管には不活性ガスが吹込まれるので、吹込まれた
ガスにより管内壁が覆われ、系内への大気の侵入が阻止
されるが、下降管ではこのような大気侵入阻止効果が存
在しないことによるものと考えられる。このような知見
に基づき発明者等は、下降管を種々改良し、下降管の耐
火物多孔体を通過しようとする大気を有効に遮断する手
段を種々検討した。[Means for Solving the Problems] The inventors have found empirically that in the case of an RH degassing tank, the intrusion of atmospheric air into the downcomer pipe is significant. This is because inert gas is blown into the riser pipe, which covers the inner wall of the pipe and prevents air from entering the system. This is thought to be due to the absence of . Based on this knowledge, the inventors have made various improvements to the downcomer pipe and have studied various means for effectively blocking the atmosphere from passing through the porous refractory material of the downcomer pipe.
この発明に係る真空脱ガス装置の浸漬管は、吹込みガス
と共に溶湯を槽内に吸い上げる第１の浸漬管と、耐火物
の多孔体で覆われ、槽内の溶湯を吐出する第２の浸漬管
と、を具備し、前記第２の浸漬管の耐火物多孔体の溶湯
に浸漬されない露出部分を不活性ガスで覆うガスシール
ド手段を有することを特徴とする。The immersion tube of the vacuum degassing device according to the present invention includes a first immersion tube that sucks up the molten metal into the tank together with the blown gas, and a second immersion tube that is covered with a porous refractory material and discharges the molten metal from the tank. It is characterized by having a gas shield means for covering the exposed portion of the porous refractory material of the second immersion tube that is not immersed in the molten metal with an inert gas.
［作用］
この発明に係る真空脱ガス装置の浸漬管においては、第
２の浸漬管を溶湯中に浸漬したときに、その耐火物多孔
体の溶湯に浸漬されない露出部分をガスシールド手段の
不活性ガスで覆うようにしている。このため、耐火物多
孔体の露出部分が大気から遮断され、処理系内に大気が
侵入せず、溶湯の窒素ピックアップが有効に阻止される
。[Function] In the immersion tube of the vacuum degassing device according to the present invention, when the second immersion tube is immersed in the molten metal, the exposed portion of the refractory porous body that is not immersed in the molten metal is covered with the inert gas shielding means. I try to cover it with gas. Therefore, the exposed portion of the refractory porous body is shielded from the atmosphere, the atmosphere is prevented from entering the processing system, and nitrogen pick-up of the molten metal is effectively prevented.
［実施例］
以下、添付の図面を参照してこの発明の実施例について
説明する。[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
第１図は、この発明の実施例に係る真空脱ガス装置の浸
漬管を示す断面模式図である。ＲＨ脱ガス設備の建屋−
階に軌条が敷設され、取鍋２が走行台車により転炉工場
から搬送されるようになっている。脱ガス槽１０が建屋
上部に設けられ、この直下に取鍋２を昇降するためのリ
フティングテーブル（図示せず）が設置されている。FIG. 1 is a schematic cross-sectional view showing an immersion tube of a vacuum degassing apparatus according to an embodiment of the present invention. RH degassing equipment building
Rails are laid on the floor, and the ladle 2 is transported from the converter factory by a traveling truck. A degassing tank 10 is provided in the upper part of the building, and a lifting table (not shown) for raising and lowering the ladle 2 is installed directly below this tank.
脱ガス槽１０は、その外面が鉄皮１１で覆われ、鉄皮１
１内に耐火物１２が内張すされている。脱ガス槽１０α
上部には、ガス排気孔及び合金材投入孔（図示せず）が
設けられている。一方、脱ガス槽１０の下部には１対の
短管部１４．１６が形成されており、短管部１４には上
昇管２４が、短管部１６には下降管２６が、それぞれフ
ランジ継手により接続されている。ガス吹込み管１５が
上昇管２４を貫通し、通路２５に不活性ガスが吹込まれ
るようになっている。The outer surface of the degassing tank 10 is covered with an iron skin 11.
1 is lined with a refractory material 12. Degassing tank 10α
A gas exhaust hole and an alloy material input hole (not shown) are provided in the upper part. On the other hand, a pair of short pipe sections 14 and 16 are formed in the lower part of the degassing tank 10, and the short pipe section 14 has an ascending pipe 24, and the short pipe section 16 has a descending pipe 26, each having a flange joint. connected by. A gas blowing pipe 15 passes through the riser pipe 24 and inert gas is blown into the passage 25.
下降管２６においては、金属筒２つの内側に耐火レンガ
２８が内張すされ、レンガ２８により実質的に溶鋼通流
路２７が取囲まれている。また、金属筒２９の外側には
高アルミナ系キャスタブル３０が所定の厚さに設けられ
、これにより下降管２６の外側が覆われている。因みに
、キャスタブル３０の気孔率は９〜１５％である。下降
管のフランジ２６ａ下面から筒状の覆い板３９が下垂し
、覆い板３９により下降管２６上部の凹所が覆い隠され
るようになっている。この覆い板３９の内面には多孔ガ
ス管４０が取付けられている。なお、覆い板３９及び多
孔ガス管４０はそれぞれフランジ２６ａから脱着可能に
設けられている。In the downcomer pipe 26, the insides of the two metal cylinders are lined with refractory bricks 28, and the bricks 28 substantially surround the molten steel passage 27. Furthermore, a high alumina castable 30 having a predetermined thickness is provided on the outside of the metal tube 29, and the outside of the downcomer pipe 26 is covered with this. Incidentally, the porosity of the castable 30 is 9 to 15%. A cylindrical cover plate 39 hangs down from the lower surface of the flange 26a of the downcomer pipe, and the cover plate 39 covers and hides the recess in the upper part of the downcomer pipe 26. A porous gas pipe 40 is attached to the inner surface of this cover plate 39. Note that the cover plate 39 and the porous gas pipe 40 are each provided so as to be detachable from the flange 26a.
第２図に示すように、多孔ガス管４０は３分割構造であ
り、各部材４０ａの内周側に多数の孔４１が形成されて
いる。各部材４０ａのそれぞれは圧力調整弁を備えたア
ルゴンガス供給源（図示せず）に連通され、ガスが供給
されると多数の孔４１から中央に向かってガスが噴出す
るようになっている。As shown in FIG. 2, the porous gas pipe 40 has a three-part structure, and a large number of holes 41 are formed on the inner peripheral side of each member 40a. Each of the members 40a is connected to an argon gas supply source (not shown) equipped with a pressure regulating valve, and when gas is supplied, the gas is ejected from the numerous holes 41 toward the center.
次に、上記脱ガス槽により溶鋼を脱ガス処理する場合に
ついて説明する。Next, a case where molten steel is degassed using the degassing tank will be described.
脱ガス槽１０内のガスを排気し、所定の圧力まで減圧す
る。取鍋２を脱ガス槽１０の直下にて停止させ、次いで
、リフティングテーブルにより取鍋２を上昇させ、上昇
管２４及び下降管２６の下端部を取鍋自溶Ｉｆ４３に浸
漬させる。このとき、スラグライン（スラグ４の湯面）
が上昇管２４及び下降管２６の上部凹所の直下に位置す
るようにする。上昇管２４及び下降管２６の浸漬により
取鍋自溶鋼３が脱ガス槽１０内に吸い上げられる。次い
で、ガス吹込み管１５にアルゴンガスを供給し、上昇管
の通路２５にガスを吹込む。これにより、溶鋼３の見掛
けの比重が低下し、溶ｙ４３がガスと共に通路２５を上
昇する一方、下降管２６を介して脱ガス槽１０内の溶鋼
が下降し、溶鋼３が取鍋２及び脱ガス槽１０の間を循環
するようになる。The gas in the degassing tank 10 is exhausted and the pressure is reduced to a predetermined pressure. The ladle 2 is stopped directly below the degassing tank 10, and then the ladle 2 is raised by a lifting table, and the lower ends of the rising pipe 24 and the descending pipe 26 are immersed in the ladle self-melting If43. At this time, the slag line (hot water surface of slag 4)
is located directly below the upper recesses of the riser pipe 24 and the downcomer pipe 26. By immersing the riser pipe 24 and the downcomer pipe 26, the ladle self-melting steel 3 is sucked up into the degassing tank 10. Next, argon gas is supplied to the gas blowing pipe 15, and the gas is blown into the passage 25 of the riser pipe. As a result, the apparent specific gravity of the molten steel 3 decreases, and the molten steel 43 moves up the passage 25 together with the gas, while the molten steel in the degassing tank 10 descends through the downcomer pipe 26, and the molten steel 3 moves into the ladle 2 and out of the degassing tank 10. The gas is circulated between the gas tanks 10.
処理開始とほぼ同時に、多孔ガス管４０に所定流量のア
ルゴンガスを供給し、これを下降管２６外面のキャスタ
ブル３０の露出部分（スラグラインより上方領域）に吹
付ける。このため、アルゴンガスで露出部分がシールド
され、キャスタブル３０を介して大気が処理系内に侵入
することが阻止される。Almost simultaneously with the start of the process, a predetermined flow rate of argon gas is supplied to the porous gas pipe 40, and argon gas is sprayed onto the exposed portion of the castable 30 on the outer surface of the downcomer pipe 26 (the area above the slag line). Therefore, the exposed portion is shielded with argon gas, and atmospheric air is prevented from entering the processing system through the castable 30.
第４図は、横軸に脱ガス処理前の溶鋼中窒素含有量［Ｎ
］をとり、縦軸に脱ガス処理後の溶鋼中窒素含有量［Ｎ
］をとって、本発明の浸漬管および従来の浸漬管により
それぞれ溶鋼を脱ガス処理した場合の両者の関係を示す
グラフ図である。図中、白丸は溶鋼環流量を毎分３００
トンとした本発明の結果を、斜線領域は溶鋼環流量を毎
分１５０トンとした従来の結果をそれぞれ示す。図から
明らかなように、本発明の実施例に係る浸漬管を用いれ
ば、下降部における処理系内への大気の侵入を有効に防
止することができ、従来の浸漬管では達成困難なレベル
であった１ ０ ｐｐｍ以下のレベルまで［Ｎ］を低減
することができた。このため、溶鋼を極低窒素鋼の領域
に迅速に脱窒素することができた。In Figure 4, the horizontal axis shows the nitrogen content [N
], and the vertical axis shows the nitrogen content in the molten steel after degassing treatment [N
] is a graph diagram showing the relationship between the cases where molten steel is degassed using the immersion tube of the present invention and the conventional immersion tube, respectively. In the figure, the white circle indicates the molten steel circulation flow rate at 300 per minute.
The shaded area shows the results of the present invention where the molten steel recirculation flow rate was 150 tons per minute. As is clear from the figure, by using the dip tube according to the embodiment of the present invention, it is possible to effectively prevent atmospheric air from entering the processing system in the descending section, at a level that is difficult to achieve with conventional dip tubes. It was possible to reduce [N] to a level of 10 ppm or less. Therefore, it was possible to quickly denitrify the molten steel to the region of ultra-low nitrogen steel.
第３図は、この発明の第２の実施例に係る脱ガス槽の下
降管フランジ部分を示す断面模式図である。この第２の
実施例においては、下降管のフランジ２６ａ内にガス通
路４２を形成し、下降管２６の凹所と覆い板３９とで形
成されたスペース内にガス通路４２を介して所定流量の
アルゴンガスが供給されるようになっている。FIG. 3 is a schematic cross-sectional view showing a downcomer pipe flange portion of a degassing tank according to a second embodiment of the present invention. In this second embodiment, a gas passage 42 is formed in the flange 26a of the downcomer pipe, and a predetermined flow rate is allowed to flow through the gas passage 42 into the space formed by the recess of the downcomer pipe 26 and the cover plate 39. Argon gas is supplied.
上記第２の実施例によれば、前記第１の実施例と同様に
溶鋼の窒素ピックアップを有効に防止することができる
と共に、ガスによりフランジが冷却されるので下降管の
寿命が延長される。According to the second embodiment, as in the first embodiment, nitrogen pick-up of molten steel can be effectively prevented, and since the flange is cooled by gas, the life of the downcomer pipe is extended.
［発明の効果］
この発明によれば、脱ガス処理中における溶湯の窒素ピ
ックアップを有効に防止することができ、［Ｎ］値を１
０ｐｐｍ以下のレベルに低減することができ、金属チタ
ン等の安定化剤を大幅に削減することができ、極低窒素
鋼を低コストかつ高能率に製造することが可能となる。[Effects of the Invention] According to the present invention, it is possible to effectively prevent nitrogen pickup in the molten metal during degassing treatment, and to reduce the [N] value to 1.
It can be reduced to a level of 0 ppm or less, the need for stabilizers such as metallic titanium can be significantly reduced, and ultra-low nitrogen steel can be manufactured at low cost and with high efficiency.
第１図はこの発明の第１の実施例に係る真空脱ガス装置
の浸漬管を示す断面模式図、第２図は第１の実施例のガ
スシールド手段としての多孔ガス管を示す斜視図、第３
図は”この発明の第２の実施例に係る真空脱ガス装置の
浸漬管の一部を示す断面模式図、第４図はこの発明の詳
細な説明するためのグラフ図である。
１０；脱ガス槽、２４；上昇管、２６：下降管、２８：
耐火レンガ、２９；金属筒、３０：キャスタブル（耐火
物多孔体）、３９；覆い板、４０；多孔ガス管、４２；
ガス通路
出願人代理人 弁理士 鈴江武彦
第
図
ズシエ里前 （Ｎｌ （ｐＰｍ）
図FIG. 1 is a schematic cross-sectional view showing a submerged tube of a vacuum degassing device according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing a porous gas pipe as a gas shielding means of the first embodiment. Third
The figure is a schematic cross-sectional view showing a part of the immersion tube of the vacuum degassing apparatus according to the second embodiment of the present invention, and FIG. 4 is a graph diagram for explaining the present invention in detail. Gas tank, 24; Ascending pipe, 26: Descending pipe, 28:
Firebrick, 29; Metal cylinder, 30: Castable (porous refractory material), 39; Cover plate, 40; Porous gas pipe, 42;
Gas passage applicant representative Patent attorney Takehiko Suzue (Nl (pPm) Diagram
Claims (1)
と、耐火物の多孔体で覆われ、槽内の溶湯を吐出する第
２の浸漬管と、を具備し、前記第２の浸漬管の耐火物多
孔体の溶湯に浸漬されない露出部分を不活性ガスで覆う
ガスシールド手段を有することを特徴とする真空脱ガス
装置の浸漬管。A first immersion pipe that sucks up the molten metal into the tank together with blown gas, and a second immersion pipe that is covered with a porous refractory material and discharges the molten metal from the tank, the second immersion pipe An immersion tube for a vacuum degassing device, characterized in that it has a gas shielding means for covering an exposed portion of the porous refractory body that is not immersed in molten metal with an inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4729189A JPH02228416A (en) | 1989-02-28 | 1989-02-28 | Dip pipe for vacuum degasification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4729189A JPH02228416A (en) | 1989-02-28 | 1989-02-28 | Dip pipe for vacuum degasification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02228416A true JPH02228416A (en) | 1990-09-11 |
Family
ID=12771181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4729189A Pending JPH02228416A (en) | 1989-02-28 | 1989-02-28 | Dip pipe for vacuum degasification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02228416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012197511A (en) * | 2011-03-08 | 2012-10-18 | Tokyo Yogyo Co Ltd | Immersion tube of vacuum degassing apparatus |
| JP2015094028A (en) * | 2013-11-14 | 2015-05-18 | 新日鐵住金株式会社 | Method and apparatus for manufacturing extreme low nitrogen steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61295315A (en) * | 1985-06-20 | 1986-12-26 | Harima Refract Co Ltd | Method for operating vacuum degassing device |
-
1989
- 1989-02-28 JP JP4729189A patent/JPH02228416A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61295315A (en) * | 1985-06-20 | 1986-12-26 | Harima Refract Co Ltd | Method for operating vacuum degassing device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012197511A (en) * | 2011-03-08 | 2012-10-18 | Tokyo Yogyo Co Ltd | Immersion tube of vacuum degassing apparatus |
| JP2015094028A (en) * | 2013-11-14 | 2015-05-18 | 新日鐵住金株式会社 | Method and apparatus for manufacturing extreme low nitrogen steel |
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