JPH0474820A - Method for accelerating degassing of molten steel - Google Patents
Method for accelerating degassing of molten steelInfo
- Publication number
- JPH0474820A JPH0474820A JP18850890A JP18850890A JPH0474820A JP H0474820 A JPH0474820 A JP H0474820A JP 18850890 A JP18850890 A JP 18850890A JP 18850890 A JP18850890 A JP 18850890A JP H0474820 A JPH0474820 A JP H0474820A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- nozzle
- spiral shape
- degassing
- spiral
- 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
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は、高純度鋼溶製に用いる真空精錬方法、特に脱
ガス促進方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a vacuum refining method used in the production of high purity steel, and in particular to a method for promoting degassing.
（ロ）従来技術
溶鋼を真空槽内に流出させることにより脱ガスを行う方
法としては、流滴脱ガス法がよく知られている。流滴説
ガス法とは、真空槽上蓋の上に設置した中間取鍋から、
ノズルをかいして溶鋼を流出させ、圧力の急激な低下に
より溶鋼中に溶解しているガスを放出させるとともに、
そのガス気泡の膨張 破裂により溶鋼を微細化し、表面
積を増加させることで脱ガス反応を促進させる精錬法で
ある。(B) Prior Art A droplet degassing method is well known as a method for degassing molten steel by flowing it into a vacuum chamber. The droplet theory gas method means that the gas is
The molten steel is flowed out through a nozzle, and the sudden drop in pressure releases the gas dissolved in the molten steel.
This is a refining method that uses the expansion and bursting of gas bubbles to refine the molten steel and increase its surface area, thereby promoting the degassing reaction.
したがって、微細化された溶鋼の粒径が小さいほど単位
溶鋼当りの表面積が大きくなり、脱ガスが促進される。Therefore, the smaller the grain size of the refined molten steel, the larger the surface area per unit of molten steel, which promotes degassing.
一方、この微細化効果は、圧力の低下に伴って発生する
ガス量によって決定される。On the other hand, this refinement effect is determined by the amount of gas generated as the pressure decreases.
このガスは主にＣｏガスとＨ２ガスである。溶鋼への溶
鋼量から計算されるＨ２ガスの発生量は少なく、それの
みでは十分に溶鋼を微細化することは不可能である。This gas is mainly Co gas and H2 gas. The amount of H2 gas generated calculated from the amount of molten steel added to the molten steel is small, and it is impossible to sufficiently refine the molten steel with only this amount.
未脱酸溶鋼では酸素の含有率が多く、圧力の低下に伴っ
て炭素との反応により多量のＣｏガスを発生し、そのガ
スのｌｌ１ｌ張、破裂により溶鋼は微細化される。Undeoxidized molten steel has a high oxygen content, and as the pressure decreases, a large amount of Co gas is generated by reaction with carbon, and the molten steel is refined by the expansion and rupture of this gas.
しかし、脱酸溶鋼では、溶鋼中の酸素はＡ１．ｏ、や５
ｉｎ２として固定されているので、圧力の低下に伴い、
炭素と反応することは少なくなる。そのために、発生ガ
スのみによる溶鋼の微細化は、必ずしも期待できるもの
ではない。However, in deoxidized molten steel, the oxygen in the molten steel is A1. o, 5
Since it is fixed as in2, as the pressure decreases,
It is less likely to react with carbon. Therefore, refinement of molten steel only by generated gas cannot necessarily be expected.
そこで、微細化を促進させる方法として、本出願人は真
空槽に通じるノズルの側壁を貫通する通気性を有しない
ガス羽口より、不活性ガスを溶鋼中に吹き込む方法を提
案した。（特願平２−９９８１３号）、シかし、ガスを
用いないで微細化を促進できれば、設備構造が簡略化さ
れ、実用化面でも有利である。Therefore, as a method for promoting refinement, the present applicant proposed a method in which inert gas is blown into molten steel through a gas tuyere that does not have air permeability and penetrates the side wall of a nozzle leading to a vacuum chamber. (Japanese Patent Application No. 2-99813), if miniaturization could be promoted without using gas, the equipment structure would be simplified and it would be advantageous in terms of practical use.
真空槽内で溶鋼を微細化し、表面積を増大させることに
より、脱ガスを促進させる流滴脱ガス法において、鋼種
に関係なく確実に溶鋼を微細化することが必須である。In the droplet degassing method, which promotes degassing by refining molten steel in a vacuum chamber and increasing its surface area, it is essential to reliably refine the molten steel regardless of the type of steel.
しかし、現在、その技術はまだ確立されていない、した
がって、脱酸溶鋼においては、溶鋼流には中心流が残留
し、処理後の到達水素濃度も１ｐｐ−以下が常に達成さ
れているとはいえない。However, at present, this technology has not been established yet. Therefore, in deoxidized molten steel, a central flow remains in the molten steel flow, and although the hydrogen concentration achieved after treatment is always below 1 pp-. do not have.
（ハ）発明が解決しようとした課題
本発明が解決しようとした課題は、鋼種に関係なく、し
かも微細化促進ガスを用いずに真空下で溶鋼を確実かつ
効率的に微細化し、脱ガスご促進させる方法を得ること
にある。(c) Problems to be solved by the present invention The problems to be solved by the present invention are to reliably and efficiently refine molten steel under vacuum without using a refinement-promoting gas, regardless of the steel type, and to degas it. The goal is to find a way to promote it.
（ニ）課題を解決するための手段
本発明の溶鋼の脱ガス促進方法は、溶鋼を真空槽内に流
出させて真空脱ガス精錬を行う方法において、前記真空
槽内に通しる。ノズル内にスパイラル形状部を形成し、
該ノズルから流出する溶鋼に旋回力を与えることからな
る手段によって、上記課題を解決している。(d) Means for Solving the Problems The method of promoting degassing of molten steel of the present invention is a method of performing vacuum degassing refining by flowing molten steel into a vacuum chamber, in which the molten steel is passed through the vacuum chamber. A spiral shaped part is formed inside the nozzle,
The above problem is solved by means of applying a swirling force to the molten steel flowing out of the nozzle.
前記ノズルのスパイラル形状部に続く部分の長さｌを該
ノズル出口内径ｄの４倍未満（ｌ＜ ４ ｄ）に設定す
ることが好ましい。It is preferable that the length l of the portion of the nozzle following the spiral-shaped portion is set to less than four times the nozzle exit inner diameter d (l<4 d).
（ホ）作用
本発明の方法においては、鋼種に関係なく真空下で溶鋼
を微細化する方法として、溶鋼に旋回力を付与し、その
力により溶鋼を飛散・微細化させる。それには、溶鋼が
真空槽内に流出するさいに通過するノズル内にスパイラ
ル形状の内部構造を設けることにより、溶鋼に旋回力を
付与し、溶鋼を飛散・微細化させ、効果的に脱ガスを促
進できることを確認した。(E) Function In the method of the present invention, a swirling force is applied to the molten steel to make the molten steel finer under vacuum regardless of the steel type, and the force causes the molten steel to scatter and become finer. To do this, by providing a spiral-shaped internal structure in the nozzle through which the molten steel flows into the vacuum chamber, a swirling force is applied to the molten steel, causing it to scatter and become fine, effectively degassing. We confirmed that it can be promoted.
ガスを用いないで液体を微細化させる方法としては、水
や油の噴霧ノズルが既に実用化されている。これらの噴
霧ノズルは液体の流路にスリットや螺旋状の溝を有する
もので、液体に乱れや回転力を付与することにより微細
化を促進している。Water and oil spray nozzles have already been put into practical use as a method for atomizing liquids without using gas. These spray nozzles have slits or spiral grooves in the liquid flow path, and promote atomization by imparting turbulence and rotational force to the liquid.
したがって、原理としては本発明の方法も上記ノズルと
同様であるが、１６００℃以上の高温の溶鋼を扱うとい
うことで、ノズル内の材質、構造が異なり、液体の物性
値も水と異なる。噴霧ノズルは通常、金属性であり高温
の溶鋼に適用すること不可能である０本発明の方法に用
いるノズルは、材質として耐熱性、耐衝撃性に優れた耐
火物を用いるとともに、ノズル外側を金属板で保護し、
強度を高めることにより溶鋼への適用を可能にしている
。Therefore, in principle, the method of the present invention is similar to the above-mentioned nozzle, but since molten steel at a high temperature of 1600° C. or higher is handled, the material and structure inside the nozzle are different, and the physical properties of the liquid are also different from water. Spray nozzles are usually made of metal and cannot be applied to high-temperature molten steel.The nozzle used in the method of the present invention is made of refractory material with excellent heat resistance and impact resistance, and the outside of the nozzle is made of a refractory material with excellent heat resistance and impact resistance. Protected by a metal plate
By increasing the strength, it can be applied to molten steel.
溶鋼が旋回力を付与され微細化する過程は次の通りであ
る。まず、ノズル内で溶鋼が旋回力を付与される。溶鋼
が回転しなからノズル出口に向かう、ノズル出口で溶鋼
は回転運動の接線方向の速度を持つので、付与された旋
回力に応じた飛散角度を持ち、飛散し微細化する。The process by which molten steel is subjected to swirling force and becomes finer is as follows. First, a swirling force is applied to the molten steel within the nozzle. The molten steel does not rotate and then heads toward the nozzle exit. At the nozzle exit, the molten steel has a velocity in the tangential direction of the rotational motion, so it has a scattering angle that corresponds to the applied swirling force, and it scatters and becomes fine.
効果的に溶鋼を飛散・微細化するには以下の条件を満た
すことが望ましい。In order to effectively scatter and refine molten steel, it is desirable to satisfy the following conditions.
（１） 溶鋼に効果的に旋回力を付与するためには、ノ
ズルに固定されるか、またはノズルと一体となったスパ
イラル形状の物により、溶鋼を強制的に旋回させること
が有効である。(1) In order to effectively apply a swirling force to the molten steel, it is effective to forcibly swirl the molten steel using a spiral-shaped object that is fixed to the nozzle or integrated with the nozzle.
溶鋼に旋回力を付与するスパイラル部分が固定されてい
ない場合には、スパイラル部分自身が回転し、効果的に
溶鋼に旋回力を付与できないばかりでなく、回転運動に
より破損する可能性がある。If the spiral portion that applies swirling force to the molten steel is not fixed, the spiral portion itself will rotate, and not only will it be unable to effectively impart swirling force to the molten steel, but it may also be damaged by the rotational movement.
（２） ノズル内のスパイラル部分からノズル出口まで
の間で溶鋼の通過する部分長さｌが、ノズル出口の直径
ｄの４倍以上の場合は、その整流作用により溶鋼の旋回
力の損失が大きい、したがって、ストレート部の長さｌ
はノズル出口の直径ｄの４倍未満（１＜ ４ ｄ）が望
ましい。(2) If the length l of the part through which molten steel passes between the spiral part in the nozzle and the nozzle exit is more than four times the diameter d of the nozzle exit, the loss of swirling force of the molten steel will be large due to the rectification effect. , therefore, the length l of the straight part
is preferably less than four times the diameter d of the nozzle outlet (1<4 d).
（へ）実施例
第１図および第２図を参照して、本発明の溶鋼の脱ガス
促進方法の実施例について説明する。(f) Example An example of the method for promoting degassing of molten steel of the present invention will be described with reference to FIGS. 1 and 2.
本発明の方法は、溶鋼を真空槽内に流出させて真空脱ガ
ス精錬を行う方法に適用される。本発明の方法は、第１
図に示すように、真空槽内に通じるノズル１０内にスパ
イラル形状部２を形成し、ノズル１０から流出する溶鋼
に旋回流を与えることを特徴としている。The method of the present invention is applied to a method of performing vacuum degassing refining by flowing molten steel into a vacuum tank. The method of the present invention includes the first
As shown in the figure, a spiral-shaped portion 2 is formed in a nozzle 10 that communicates with the inside of a vacuum chamber, and a swirling flow is imparted to the molten steel flowing out from the nozzle 10.
本発明の方法に用いるノズル１０は、耐火材からなるノ
ズル本体ｌの外周を鋼板３で覆って保護し、ノズル本体
１の内部に上から導入路４、スパイラル形状部２、スパ
イラル形状部に続く部分５が形成されている。The nozzle 10 used in the method of the present invention has a nozzle body l made of a refractory material, whose outer periphery is covered with a steel plate 3 to protect it, and into the inside of the nozzle body 1, an introduction path 4, a spiral-shaped part 2, and a spiral-shaped part are connected from above. A portion 5 is formed.
スパイラル形状部２としては、第２図に示すように、耐
火材からなる予めスパイラル状に形成した中子２ａをノ
ズル本体内に挿入してもよい。As the spiral-shaped portion 2, as shown in FIG. 2, a core 2a made of a refractory material and formed in a spiral shape in advance may be inserted into the nozzle body.
第１図に示すように、ノズル１０のスパイラル形状部２
に続く部分５の長さ！をノズル１０出口内径ｄの４倍未
満（ｌ＜ ４ ｄ）に設定することが好ましい。As shown in FIG. 1, the spiral-shaped portion 2 of the nozzle 10
The length of part 5 following! is preferably set to less than four times the nozzle 10 outlet inner diameter d (l<4 d).
次に、本発明の方法の具体的実施例について説明する。Next, specific examples of the method of the present invention will be described.
第１図および第２図に示すように、ノズル本体１にスパ
イラル形状部２として中子２ａを固定し、本体１の外面
を鋼板３で覆って実験を行い、溶鋼の飛散状況および脱
ガス挙動き調査した。Ａ！脱酸鋼をノズル１０をかいし
て真空度１ ｔｏｒｒ以下に減圧された真空槽内に流出
させた。第１表にその実験結果を示す。As shown in FIGS. 1 and 2, an experiment was conducted by fixing a core 2a as a spiral-shaped part 2 to a nozzle body 1 and covering the outer surface of the body 1 with a steel plate 3. I investigated. A! The deoxidized steel was passed through a nozzle 10 into a vacuum chamber whose pressure was reduced to 1 torr or less. Table 1 shows the experimental results.
Ｎ００１では、スパイラル形状の中子２ａをノズル１０
固定していなかったために、実験開始直後に破損落下し
た。スパイラル形状の中子２ａを固定したＮｏ、２では
良好な飛散状況が得られている。In N001, the spiral-shaped core 2a is inserted into the nozzle 10.
Because it was not secured, it broke and fell immediately after the experiment started. Good scattering conditions were obtained for No. 2 in which the spiral-shaped core 2a was fixed.
スパイラル形状中子２ａの固定方法としては、例えば、
中子２ａとノズル本体１との間をモルタルにより固定す
るか、または、ノズル本体内壁に凹部を設けて嵌合させ
る方法等がある。As a method for fixing the spiral-shaped core 2a, for example,
There are methods such as fixing the core 2a and the nozzle body 1 with mortar, or providing a recess in the inner wall of the nozzle body and fitting them together.
溶鋼の飛散状況に対する中子２８のスパイラル部とノズ
ル出口との間にある部分５の距ｗ１１の影響はＮｏ、２
〜５の実験から得られる。距Ｎ、ｌがノズル出口の直径
ｄの３倍までは、飛散角度が減少しているが、良好な微
細化が得られている。しかし、４倍になると（Ｎｏ、５
）飛散角度は急激に小さくなり微細化も不良である。The influence of the distance w11 of the portion 5 between the spiral portion of the core 28 and the nozzle outlet on the scattering state of molten steel is No. 2.
Obtained from ~5 experiments. Although the scattering angle decreases until the distance N, l reaches three times the diameter d of the nozzle exit, good refinement is obtained. However, when it becomes 4 times (No, 5
) The scattering angle decreases rapidly and the fineness is also poor.
（ト）効果
本発明によれば、鋼種に関係なく、しかも微細化促進ガ
スを用いることなく、真空下で溶鋼を確実かつ効率的に
微細化し、脱ガスを促進させることができる。(g) Effects According to the present invention, molten steel can be reliably and efficiently refined under vacuum and degassing can be promoted regardless of the steel type and without using a refinement-promoting gas.
第１図は本発明の方法に用いるノズルの縦断面図。第２
図は第１図のノズル内に挿入される中子の斜視図。
１０、ノズル １ ノズル本体２： スパ
イラル形状部 ２ａ中子
３ 鋼板 ４ 導入路
５ スパイラル形状部に続く部分
特許出願人 住友金属工業株式会社
（外４名）FIG. 1 is a longitudinal sectional view of a nozzle used in the method of the present invention. Second
The figure is a perspective view of the core inserted into the nozzle of FIG. 1. 10. Nozzle 1 Nozzle body 2: Spiral shaped part 2a Core 3 Steel plate 4 Introduction path 5 Part following the spiral shaped part Patent applicant Sumitomo Metal Industries, Ltd. (4 others)
Claims (1)
方法において、前記真空槽内に通じるノズル内にスパイ
ラル形状部を形成し、該ノズルから流出する溶鋼に旋回
力を与えることにより溶鋼を飛散微細化させることを特
徴とした溶鋼の脱ガス促進方法。 ２、前記ノズルのスパイラル形状部に続く部分の長さｌ
を該ノズル出口内径ｄの４倍未満（ｌ＜４ｄ）に設定す
ることを特徴とした請求項１記載の方法。[Claims] 1. In a method for performing vacuum degassing refining by flowing molten steel into a vacuum chamber, a spiral-shaped portion is formed in a nozzle communicating with the vacuum chamber, and the molten steel flowing out from the nozzle is swirled. A method for promoting degassing of molten steel characterized by scattering and making molten steel finer by applying force. 2. Length l of the part of the nozzle following the spiral shape part
2. The method according to claim 1, wherein d is set to less than four times the nozzle outlet inner diameter d (l<4d).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18850890A JPH0474820A (en) | 1990-07-17 | 1990-07-17 | Method for accelerating degassing of molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18850890A JPH0474820A (en) | 1990-07-17 | 1990-07-17 | Method for accelerating degassing of molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0474820A true JPH0474820A (en) | 1992-03-10 |
Family
ID=16224951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18850890A Pending JPH0474820A (en) | 1990-07-17 | 1990-07-17 | Method for accelerating degassing of molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0474820A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1025933A4 (en) * | 1997-09-22 | 2001-11-07 | Katsukiyo Marukawa | Immersion nozzle |
| EP1759789A1 (en) * | 2005-08-30 | 2007-03-07 | Krosakiharima Corporation | Pouring tube structure and pouring method for uphill casting |
| JP2007216295A (en) * | 2005-08-30 | 2007-08-30 | Kurosaki Harima Corp | Pouring type pouring pipe and pouring method |
| JP2008002715A (en) * | 2006-06-20 | 2008-01-10 | Tohoku Univ | Cryogenic microslash generation system |
| JP2008006456A (en) * | 2006-06-28 | 2008-01-17 | Kyocera Corp | Stoke and low pressure casting equipment using the same |
| CN108436071A (en) * | 2018-05-31 | 2018-08-24 | 东北大学秦皇岛分校 | A kind of continuous casting spin current long nozzle |
| CN108526453A (en) * | 2018-05-31 | 2018-09-14 | 东北大学秦皇岛分校 | A kind of continuous casting spin current submersed nozzle |
| WO2021214070A3 (en) * | 2020-04-21 | 2022-01-20 | Refractory Intellectual Property Gmbh & Co. Kg | Submerged nozzle with rotatable insert |
-
1990
- 1990-07-17 JP JP18850890A patent/JPH0474820A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1025933A4 (en) * | 1997-09-22 | 2001-11-07 | Katsukiyo Marukawa | Immersion nozzle |
| EP1759789A1 (en) * | 2005-08-30 | 2007-03-07 | Krosakiharima Corporation | Pouring tube structure and pouring method for uphill casting |
| JP2007216295A (en) * | 2005-08-30 | 2007-08-30 | Kurosaki Harima Corp | Pouring type pouring pipe and pouring method |
| JP2008002715A (en) * | 2006-06-20 | 2008-01-10 | Tohoku Univ | Cryogenic microslash generation system |
| JP2008006456A (en) * | 2006-06-28 | 2008-01-17 | Kyocera Corp | Stoke and low pressure casting equipment using the same |
| CN108436071A (en) * | 2018-05-31 | 2018-08-24 | 东北大学秦皇岛分校 | A kind of continuous casting spin current long nozzle |
| CN108526453A (en) * | 2018-05-31 | 2018-09-14 | 东北大学秦皇岛分校 | A kind of continuous casting spin current submersed nozzle |
| CN108436071B (en) * | 2018-05-31 | 2024-05-14 | 东北大学秦皇岛分校 | Spin-flow long nozzle for continuous casting |
| CN108526453B (en) * | 2018-05-31 | 2024-05-14 | 东北大学秦皇岛分校 | Spin flow immersion nozzle for continuous casting |
| WO2021214070A3 (en) * | 2020-04-21 | 2022-01-20 | Refractory Intellectual Property Gmbh & Co. Kg | Submerged nozzle with rotatable insert |
| CN115315325A (en) * | 2020-04-21 | 2022-11-08 | 里弗雷克特里知识产权两合公司 | Submerged entry nozzle with rotatable insert |
| US12017273B2 (en) | 2020-04-21 | 2024-06-25 | Refractory Intellectual Property Gmbh & Co. Kg | Submerged nozzle with rotatable insert |
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