JPS5952204B2 - Molten steel degassing method - Google Patents
Molten steel degassing methodInfo
- Publication number
- JPS5952204B2 JPS5952204B2 JP12304278A JP12304278A JPS5952204B2 JP S5952204 B2 JPS5952204 B2 JP S5952204B2 JP 12304278 A JP12304278 A JP 12304278A JP 12304278 A JP12304278 A JP 12304278A JP S5952204 B2 JPS5952204 B2 JP S5952204B2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- degassing
- container
- 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.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 43
- 239000010959 steel Substances 0.000 title claims description 43
- 238000007872 degassing Methods 0.000 title claims description 41
- 239000007789 gas Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 16
- 239000011261 inert gas Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 2
- 238000005261 decarburization Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】
本発明は、溶鋼を繰返し真空にさらすことによって脱ガ
スを行う溶鋼の脱ガス方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for degassing molten steel in which the molten steel is degassed by repeatedly exposing the molten steel to vacuum.
溶鋼の脱ガス方法としては、従来から、多数の方法が知
られている。Many methods have been known for degassing molten steel.
特に精練直後の溶鋼を真空雰囲気にさらすことにより行
う真空脱ガス方法は溶鋼の大量処理、低コスト等の点で
量産鋼種には重要である。In particular, the vacuum degassing method, which is performed by exposing molten steel to a vacuum atmosphere immediately after refining, is important for mass-produced steel types in terms of large-volume processing of molten steel and low cost.
また最近では軽処理法と称して、短時間に脱ガスの他溶
鋼の成分や温度を後続工程に合わせる方法が採用され始
めた。Recently, a method called the light treatment method has begun to be adopted, in which the composition and temperature of molten steel are adjusted to the subsequent steps in addition to degassing in a short time.
脱ガスの対称となる溶鋼中のガスとしては水素、酸素、
窒素があるが、酸素は減圧下で
ｃ十ｏ＝ｃ。Gases in molten steel that can be degassed include hydrogen, oxygen,
There is nitrogen, but oxygen is c0o=c under reduced pressure.
の反応を促進して脱ガスができ、またこの反応によって
脱炭を図ることを重視する鋼種もある。Degassing can be achieved by promoting this reaction, and there are also steel types that place emphasis on decarburization through this reaction.
更に脱ガス工程に脱炭という精練工程の一部を組込むこ
とにより、転炉の熱負荷を減じることも可能となる。Furthermore, by incorporating part of the scouring process called decarburization into the degassing process, it is also possible to reduce the heat load on the converter.
また、取鍋の上方に真空容器を配して溶鋼をこの真空容
器に導入して脱ガスを図る方法には、（イ）ＲＨ法と称
される環流式脱ガス法
（ロ）ＤＨ法と称される吸上式脱ガス法
が知られている。In addition, there are two methods for degassing by placing a vacuum container above the ladle and introducing molten steel into the vacuum container: (a) reflux degassing called the RH method; and (b) the DH method. A wicking degassing method is known.
しかし、（イ）法では、溶鋼の移動にガスリフトポンプ
の原理を利用するので、溶鋼の循環機構が複雑で、ガス
リフトによる循環速度が所定の要求に応じ難いことがあ
り、循環速度の増大を図って導入ガス量を増すと吸上管
耐火物の損傷が増大する、等の欠点がある。However, since method (a) uses the principle of a gas lift pump to move molten steel, the molten steel circulation mechanism is complex, and the circulation speed by gas lift may be difficult to meet specified requirements, so it is difficult to increase the circulation speed. However, if the amount of gas introduced is increased, damage to the refractories of the suction pipe increases.
一方（ロ）法では、吸上管内を溶鋼が往復運動すること
、並に真空容器が間けつ的に空になることから、Ａｒ等
によるガスバブリングによる脱ガス有効表面積の増大を
効率よく行い難く、更にまたこの方法は大規模に実施す
る場合には排気設備を伴なった脱ガス容器または溶鋼の
入った取鍋は大重量となり、これを上下することは種々
の困難を伴ない、これを支持するための構造は大規模な
ものとなり、莫大な建設費を要する、等の欠点がある。On the other hand, in method (b), because the molten steel reciprocates in the suction pipe and the vacuum vessel is emptied intermittently, it is difficult to efficiently increase the effective surface area for degassing by gas bubbling with Ar, etc. Furthermore, if this method is carried out on a large scale, the degassing container with exhaust equipment or the ladle containing molten steel will be heavy, and raising and lowering it will be accompanied by various difficulties. There are drawbacks, such as the need for a large-scale supporting structure and a huge construction cost.
本発明は従来法の有する上述の諸欠点を是正することを
目的としなしたもので、気密にできるような容器状の台
車の内部に、溶鋼を入れた取鍋を置き、前記溶鋼に先端
が浸るようにした流通管を有する脱ガス容器で前記台車
に蓋をし、脱ガス容器内を真空に保ち、取鍋周囲の大気
を不活性ガスで置換した後、台車を気密とし、取鍋周囲
のガス圧を大気圧以上の圧力と大気圧とに周期的に変化
させて、溶鋼を脱ガス容器内に出し入れすると共に脱ガ
ス容器内にその底部よりＡｒ或はＡｒ・０２混合ガスを
連続的に吹込むことを特徴とする溶鋼の脱ガス方法に係
る。The present invention was made with the aim of correcting the above-mentioned drawbacks of the conventional method.A ladle containing molten steel is placed inside a container-shaped cart that can be made airtight, and the tip of the molten steel is The cart is covered with a degassing container having a flow pipe that can be submerged, the inside of the degassing container is kept in a vacuum, and the atmosphere around the ladle is replaced with an inert gas. By periodically changing the gas pressure between atmospheric pressure and above, the molten steel is taken in and out of the degassing container, and Ar or Ar/02 mixed gas is continuously supplied into the degassing container from the bottom of the container. The present invention relates to a method for degassing molten steel, which is characterized by blowing into molten steel.
以下、図面を参照しつつ本発明の詳細な説明する。Hereinafter, the present invention will be described in detail with reference to the drawings.
第１図及び第２図は本発明の一実施例に係り、溶鋼の脱
ガス方法に用いる装置の一例を示すものである。FIGS. 1 and 2 relate to an embodiment of the present invention and show an example of an apparatus used in a method for degassing molten steel.
１は気密にできるよう容器状に形成した走行自在な台車
である。Reference numeral 1 denotes a movable trolley shaped like a container so as to be airtight.
該台車１内には溶鋼Ｓを入れた。取鍋２が、台車１内面
に対し所要の間隔があくよう置いである。Molten steel S was placed in the trolley 1. The ladle 2 is placed with a required distance from the inner surface of the cart 1.
３は脱ガス容器であり、該脱ガス容器３の頂部には排気
口４が設けであると共に底部には、前記容器３と一体構
造の流通管５が設けてあり、更に底部から容器内に脱ガ
ス促進用ガス１′（Ａｒ、 Ａｒ・０□混合ガス）を導
入するガス導入系６が前記容器３に接続しである。Reference numeral 3 denotes a degassing container, and the top of the degassing container 3 is provided with an exhaust port 4, and the bottom thereof is provided with a flow pipe 5 that is integrally constructed with the container 3. A gas introduction system 6 for introducing a degassing promoting gas 1' (Ar, Ar.0□ mixed gas) is connected to the container 3.
前記容器状の台車１は、脱ガ容器３の流通管５先端部が
取鍋２内の溶鋼Ｓ中に浸るように、脱ガス容器３でもっ
て気密状態に蓋をされている。The container-shaped cart 1 is hermetically covered with a degassing container 3 so that the tip of the flow pipe 5 of the degassing container 3 is immersed in the molten steel S in the ladle 2.
尚７は取鍋２に取付けたストッパ、８は台車の周囲に配
した気密保持用バッキング、９は台車１に連通させた溶
鋼移行用加圧配管、１０は該配管９に接続したシリンダ
である。In addition, 7 is a stopper attached to the ladle 2, 8 is a backing for airtightness arranged around the cart, 9 is a pressure piping for transferring molten steel that is communicated with the cart 1, and 10 is a cylinder connected to the piping 9. .
次に上記構成の装置を用いた溶鋼の脱ガス方法。Next, a method for degassing molten steel using the apparatus configured as described above.
を述べる。state.
台車１に、図示の如く、脱ガス容器３で蓋をした後、脱
ガス容器３内をを排気により真空に保ち、取鍋２周囲の
大気をＡｒ等の不活性ガスで置換し、その後台車１を気
密状態にし、取鍋２周囲。After covering the trolley 1 with a degassing container 3 as shown in the figure, the interior of the degassing container 3 is kept in a vacuum by exhausting air, the atmosphere around the ladle 2 is replaced with an inert gas such as Ar, and then the trolley Make 1 airtight and place around ladle 2.
のガス圧を大気圧以上の圧力と大気圧とに周期的に変化
させて、流通管５を介し、取鍋２内の溶鋼Ｓを脱ガス容
器３内に出し入れすると共に（シリンダ１０により行な
う）、脱ガス容器３内にその底部からＡｒ或はＡｒ・０
□混合ガスのようなガスを。The molten steel S in the ladle 2 is transferred into and out of the degassing container 3 via the flow pipe 5 by periodically changing the gas pressure between the pressure above the atmospheric pressure and the atmospheric pressure (this is done by the cylinder 10). , Ar or Ar・0 is introduced into the degassing container 3 from its bottom.
□Gas like mixed gas.
連続的に吹込んで溶鋼の脱ガスは勿論のこと脱炭も行う
。Continuous injection not only degasses the molten steel but also decarburizes it.
第１図は、台車１に脱ガス容器３で蓋をも、脱ガス容器
３内を排気により真空にした状態を示し、取鍋２内溶鋼
面と脱ガス容器３内溶鋼面とのレベル差は約１４００ｍ
ｍである。Fig. 1 shows a state in which the degassing container 3 is placed on the trolley 1 with a lid and the inside of the degassing container 3 is evacuated by evacuation, and the level difference between the molten steel surface in the ladle 2 and the molten steel surface in the degassing container 3 is shown. is about 1400m
It is m.
第２図は取鍋２周囲をＡｒ等のような不活性ガスで置換
後加圧し、溶鋼Ｓを脱ガス容器３内に流入させた状態を
示し、取鍋２内溶鋼面と脱ガス容器３内溶鋼面とのレベ
ル差は前記１４００ｍｍより大であり、その高さは１回
に出し入れする溶鋼量で変る。Figure 2 shows a state in which the area around the ladle 2 is replaced with an inert gas such as Ar, then pressurized, and the molten steel S flows into the degassing container 3. The level difference with the internal molten steel surface is greater than the above-mentioned 1400 mm, and the height changes depending on the amount of molten steel that is taken in and out at one time.
その量が例えば２１ＴＯＮであり、体積を３ｍ”、脱ガ
ス容器３内径を３．２ｍとすると、増加する溶鋼高さは
３８ｃｍであり、気圧にして約０．２６ａｔｍである。If the amount is, for example, 21 TON, the volume is 3 m'', and the inner diameter of the degassing container 3 is 3.2 m, the increased height of the molten steel is 38 cm, which is approximately 0.26 atm in terms of atmospheric pressure.
この２１ＴＯＨの溶鋼量の制御は、圧力と熱の補正をさ
れた３ｍ８に相当する内容積のシリンダーとピストンと
の組合せを用いるが、或は加圧装置（Ａｒ圧縮機）とリ
ークバルブとの組合せによって実施する。To control the amount of 21TOH molten steel, a combination of a cylinder and a piston with an internal volume equivalent to 3m8 that has been compensated for pressure and heat, or a combination of a pressure device (Ar compressor) and a leak valve is used. Implemented by.
しかし作動ガスが圧縮性であるため取鍋２周囲の空間は
できるだけ小さくすることが望ましい。However, since the working gas is compressible, it is desirable to make the space around the ladle 2 as small as possible.
また作動ガス系はＡｒの放散損失を防ぐよう閉回路とし
、回収系を含むことが望ましい。Further, it is desirable that the working gas system is a closed circuit to prevent Ar dissipation loss and includes a recovery system.
以上述べたような構成及び作用により本発明の脱ガス方
法は次のような効果を発揮する。With the configuration and operation described above, the degassing method of the present invention exhibits the following effects.
ｉ 脱ガス容器や取鍋の上下運動に機械的エネルギーを
用いないため、設備を大規模にする必要がない。i Since no mechanical energy is used to move the degassing container or ladle up and down, there is no need for large-scale equipment.
ｉｉ 脱ガス容器の炉底レンガが露出しないようにす
るため、脱ガス容器内溶鋼に連続的にガスを吹込んで溶
鋼を攪拌でき、脱ガスを促進できるばかりテなく、吹込
むガスにＡｒ−０２混合ガスを用いると強制脱炭も容易
になる。ii In order to prevent the bottom bricks of the degassing container from being exposed, gas can be continuously blown into the molten steel in the degassing container to stir the molten steel. Using a mixed gas also makes forced decarburization easier.
ｉｉｉ 取鍋周りの雰囲気が不活性ガスであるため取
鍋内の溶鋼表面からのガス吸収がない。iii Since the atmosphere around the ladle is an inert gas, there is no gas absorption from the surface of the molten steel in the ladle.
ｉｖ ＜り返し真空にさらす溶鋼の量の制御は取鍋や
脱ガス容器の上下運動によらず、ガスの体積或はガス′
の圧力で検知するためきわめて容易な作業となる。iv <The amount of molten steel repeatedly exposed to vacuum can be controlled by controlling the volume of gas or the amount of gas
This is an extremely easy task as it is detected by pressure.
第１図及び第２図は本発明の溶鋼の脱ガス方法に用いる
装置の一例を示す断面図である。
Ｓ・・・溶鋼、１・・・台車、２・・・取鍋、３・・・
脱ガス容器、５・・・流通管、６・・・ガス導入系、１
０・・・シリンダ。FIGS. 1 and 2 are cross-sectional views showing an example of an apparatus used in the molten steel degassing method of the present invention. S... Molten steel, 1... Trolley, 2... Ladle, 3...
Degassing container, 5... Distribution pipe, 6... Gas introduction system, 1
0...Cylinder.
Claims (1)
入れた取鍋を置き、前記溶鋼に先端が浸るようにした流
通管を有する脱ガス容器で前記台車に蓋をし、脱ガス容
器内を真空に保ち、取鍋周囲の大気を不活性ガスで置換
した後、台車を気密とし、取鍋周囲のガス圧を大気圧以
上の大気圧とに周期的に変化させて、溶鋼を脱ガス容器
内に出し入れすると共に脱ガス容器内にその底部よりＡ
ｒ或はＡｒ−０２混合ガスを連続的に吹込むことを特徴
とする溶鋼の脱ガス方法。1. Place a ladle containing molten steel inside a container-shaped cart that can be made airtight, cover the cart with a degassing container having a flow pipe whose tip is immersed in the molten steel, and remove the degassed container. After maintaining a vacuum inside the ladle and replacing the atmosphere around the ladle with inert gas, the trolley is made airtight and the gas pressure around the ladle is periodically changed to atmospheric pressure or higher to remove the molten steel. While putting it in and taking it out of the gas container, I put A into the degassing container from the bottom.
A method for degassing molten steel, characterized by continuously blowing r or Ar-02 mixed gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12304278A JPS5952204B2 (en) | 1978-10-05 | 1978-10-05 | Molten steel degassing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12304278A JPS5952204B2 (en) | 1978-10-05 | 1978-10-05 | Molten steel degassing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5550418A JPS5550418A (en) | 1980-04-12 |
| JPS5952204B2 true JPS5952204B2 (en) | 1984-12-18 |
Family
ID=14850761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12304278A Expired JPS5952204B2 (en) | 1978-10-05 | 1978-10-05 | Molten steel degassing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952204B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61202702U (en) * | 1985-06-11 | 1986-12-19 | ||
| JPS627011U (en) * | 1985-06-27 | 1987-01-16 | ||
| JPS63122911A (en) * | 1986-11-13 | 1988-05-26 | Kobe Steel Ltd | Position detector |
| JPS6387506U (en) * | 1987-05-29 | 1988-06-07 | ||
| JPH0184005U (en) * | 1987-11-24 | 1989-06-05 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731231B2 (en) * | 1982-09-30 | 1995-04-10 | 松下電工株式会社 | Voltage comparison circuit |
| JP4820909B2 (en) * | 2010-03-03 | 2011-11-24 | 株式会社野村総合研究所 | Environmental adjustment method and environmental adjustment system of information center |
-
1978
- 1978-10-05 JP JP12304278A patent/JPS5952204B2/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61202702U (en) * | 1985-06-11 | 1986-12-19 | ||
| JPS627011U (en) * | 1985-06-27 | 1987-01-16 | ||
| JPS63122911A (en) * | 1986-11-13 | 1988-05-26 | Kobe Steel Ltd | Position detector |
| JPS6387506U (en) * | 1987-05-29 | 1988-06-07 | ||
| JPH0184005U (en) * | 1987-11-24 | 1989-06-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5550418A (en) | 1980-04-12 |
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