JPH06100925A - Deoxidizing and dehydrogenizing treatment of molten steel - Google Patents
Deoxidizing and dehydrogenizing treatment of molten steelInfo
- Publication number
- JPH06100925A JPH06100925A JP27658292A JP27658292A JPH06100925A JP H06100925 A JPH06100925 A JP H06100925A JP 27658292 A JP27658292 A JP 27658292A JP 27658292 A JP27658292 A JP 27658292A JP H06100925 A JPH06100925 A JP H06100925A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- deoxidizing
- oxygen
- gas
- hydrogen
- 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
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】鋼の溶解、脱炭素過程に於いて酸
素吹錬により過剰の酸素が溶鋼中に溶存するものであ
り、また鉄鋼原料スクラップや溶解容器などから水蒸
気、水素が溶鋼中に溶存するものである。本発明は溶鋼
中に溶存したこれらの酸素、水素を効率的に除去する溶
鋼の脱酸素および脱水素処理方法に関するものである。[Industrial application] Excess oxygen is dissolved in molten steel by oxygen blowing during melting and decarbonization of steel. Also, steam and hydrogen are dissolved in molten steel from steel raw material scrap and melting vessels. It is one that is dissolved. The present invention relates to a method for deoxidizing and dehydrogenating molten steel for efficiently removing these oxygen and hydrogen dissolved in molten steel.
【０００２】[0002]
【従来の技術】高品質鋼を造る目的で、鋼中の酸素、水
素を除去するために、溶鋼中にA1,Siなどの脱酸用の金
属を投入する方法とか真空脱ガス装置によって、水素な
ど溶存するガスを除去する方法が行われていた。即ち、
溶鋼中にA1,Siなどの金属を投入することにより、〔O〕
+ A1,Si = Al2O3，SiO2の反応により、溶鋼中の酸素
を除去した。また真空脱ガス装置として取鍋真空脱ガス
法、ＤＨ法、ＲＨ法などの方法により溶鋼中へのガスの
溶解度を低下させて脱ガスする方法によりガスを除去し
た。2. Description of the Related Art For the purpose of producing high quality steel, hydrogen is removed by a method of introducing deoxidizing metal such as A1, Si into molten steel or a vacuum degassing device in order to remove oxygen and hydrogen in the steel The method of removing the dissolved gas was performed. That is,
By adding metals such as A1 and Si into the molten steel, [O]
Oxygen in molten steel was removed by the reaction of + A1, Si = Al 2 O 3 and SiO 2 . As a vacuum degassing apparatus, the gas was removed by a method of degassing by reducing the solubility of the gas in the molten steel by a ladle vacuum degassing method, a DH method, an RH method, or the like.
【０００３】[0003]
【発明が解決しようとする課題】この方法により酸素を
除去した場合に、反応生成物であるAl2O3，SiO2ができ
ることになり、これらを溶鋼中から除去するために滓化
のための材料を投入、反応させてスラグ化し浮上させて
取り除いた。しかし、この滓化処理が十分に出来ない場
合に、これらの金属の酸化物が、介在物として鋼の最終
製品に混在する危険が存在した。また、水素を除去する
プロセスに於いては、大形耐火物設備、真空装置が必要
とされ、処理コストと時間がかかっていた。When oxygen is removed by this method, Al 2 O 3 and SiO 2 which are reaction products are formed, and in order to remove these from the molten steel, the slag is removed. The material was charged and reacted to form slag, which was floated and removed. However, if this slag treatment is not sufficiently performed, there is a risk that oxides of these metals may be mixed as inclusions in the final steel product. Further, in the process of removing hydrogen, large refractory equipment and a vacuum device are required, which requires processing cost and time.
【０００４】[0004]
【課題を解決するための手段】溶鋼の脱酸素、および脱
水素処理の方法として、揮発性の弗化カ−ボンを単独あ
るいは不活性気体と混合して、溶鋼中に吹き込み、溶鋼
中に溶存する酸素、水素と反応させ直接的に除去する方
法である。即ち、弗化カ−ボンと酸素、水素がC2F4 +
〔O〕，〔H〕= CO2，HF の反応により炭酸ガスと弗化
水素ガスとなり酸素、水素を除去し、反応生成物がガス
として放出される方法を基本原理とするものである。As a method of deoxidizing and dehydrogenating molten steel, a volatile fluorocarbon is used alone or mixed with an inert gas and blown into the molten steel to dissolve it in the molten steel. It is a method of directly removing oxygen by reacting with oxygen and hydrogen. That is, carbon fluoride, oxygen, and hydrogen are C 2 F 4 +.
The basic principle is that the reaction of [O], [H] = CO 2 , HF becomes carbon dioxide gas and hydrogen fluoride gas to remove oxygen and hydrogen, and the reaction product is released as gas.
【０００５】先ず図１及び図２は、溶鋼容器１の底部に
付設されたガス吹き込み用耐火性プラグ２のガス吹き込
み孔４を介して揮発性弗化カ−ボンガスあるいはアルゴ
ンガス（不活性気体）との混合ガスを溶鋼３中に吹き込
み、溶鋼３中に溶存する酸素，水素を除去する方法であ
る。また図３は、溶鋼容器１の上部から耐火性ランスパ
イプ５を挿入し、該耐火性ランスパイプ５を介して揮発
性弗化カ−ボンガスあるいはアルゴンガス（不活性気
体）との混合ガスを溶鋼３中に吹き込み、溶鋼３中に溶
存する酸素、水素を除去する方法である。なを図３の６
は耐火性ランスパイプ５のガス吹き込み孔である。First, FIGS. 1 and 2 show volatile carbon fluoride gas or argon gas (inert gas) through a gas injection hole 4 of a gas injection refractory plug 2 attached to the bottom of a molten steel container 1. Is a method of blowing oxygen into the molten steel 3 to remove oxygen and hydrogen dissolved in the molten steel 3. Further, in FIG. 3, a refractory lance pipe 5 is inserted from the upper part of the molten steel container 1, and a mixed gas of volatile fluorocarbon gas or argon gas (inert gas) is melted through the refractory lance pipe 5. 3 is a method of blowing oxygen into the molten steel 3 to remove oxygen and hydrogen dissolved in the molten steel 3. Na 6 of FIG.
Is a gas blowing hole of the refractory lance pipe 5.
【０００６】取鍋内の溶鋼温度は1600℃であるため、弗
化カ−ボンは溶鋼の有する高温度により直ちに熱分解し
て、C2F4→ C + CF4 + F の反応をおこし、強い還元
性のガスとなって溶鋼中に拡散する。これらガスが溶鋼
中に溶存する酸素、水素あるいは化合物として存在する
酸素、水素と結合して炭素酸化物、弗化水素ガスを生成
する。反応は鋼の原料や精錬過程で含有される酸素、水
素と化学量論的に進行する。Since the temperature of the molten steel in the ladle is 1600 ° C., the carbon fluoride is immediately pyrolyzed by the high temperature of the molten steel to cause a reaction of C 2 F 4 → C + CF 4 + F, It becomes a strong reducing gas and diffuses into molten steel. These gases combine with oxygen dissolved in the molten steel, hydrogen, or oxygen existing as a compound, and hydrogen to generate carbon oxide and hydrogen fluoride gas. The reaction proceeds stoichiometrically with the raw materials of steel and oxygen and hydrogen contained in the refining process.
【０００７】この脱酸素、脱水素反応を溶鋼中で効率的
に行うことが大切である。その方法として、弗化カ−ボ
ンガスを溶鋼中に吹き込む場合に、溶鋼中の弗化カ−ボ
ンガスの均一分散のための拡散作用とガス分圧をコント
ロ−ルするために不活性ガスを混合して単一ノズル孔か
ら吹き込む方法（図１及び図３の場合）、あるいは、図
４の二重管方式にして内管８から弗化カ−ボンガスを、
外管７から不活性ガスを吹き込む方法を使用する。なを
図４における９は耐火物である。It is important to efficiently carry out this deoxidation and dehydrogenation reaction in molten steel. As a method, when blowing carbon fluoride gas into molten steel, an inert gas is mixed to control the diffusion action and the gas partial pressure for uniform dispersion of the carbon fluoride gas in the molten steel. A single nozzle hole (in the case of FIGS. 1 and 3) or a double tube system of FIG.
A method of blowing an inert gas from the outer tube 7 is used. In addition, 9 in FIG. 4 is a refractory material.
【０００８】揮発性の弗化カ−ボンは、本発明の目的を
代表する脱酸素、脱水素の反応を実行する基本的方法で
あり、実際的にはこの種の反応と基本的に同一とみなす
ことのできるガスとしてフロンガス、テトラクロロエチ
レン、ヘキサクロロプロピレン、トリクロロエチレンな
どカ−ボン−ハロゲン系のガスはこの目的に使用するこ
とが可能である。それらは経済性などから高生産性の揮
発性の弗化カ−ボン系のガスが選択される。Volatile fluorinated carbon is a basic method for carrying out the deoxygenation and dehydrogenation reactions that represent the purpose of the present invention, and is practically basically the same as this type of reaction. As a gas that can be regarded, carbon-halogen type gas such as CFC gas, tetrachloroethylene, hexachloropropylene, and trichloroethylene can be used for this purpose. For these reasons, a highly productive volatile carbon fluoride gas is selected from the viewpoint of economy.
【０００９】[0009]
【実施例】１トンの鋼スクラップを酸素吹錬によって溶
解し、揮発性の弗化カ−ボンモノマ−ガスを耐火物チュ
−ブを介して溶鋼中に吹きこみ処理を行い、溶鋼中に含
有される酸素と水素の定量を行った。その結果、処理前
の酸素量４６０ｐｐｍ，水素料７５ｐｐｍが処理後は酸
素量１８ｐｐｍ，水素量７ｐｐｍとなり脱酸素、脱水素
処理効果を確認した。EXAMPLE 1 ton of steel scrap was melted by oxygen blowing, and volatile fluorocarbon monomer gas was blown into the molten steel through a refractory tube to contain it in the molten steel. Oxygen and hydrogen were quantified. As a result, the oxygen amount before treatment was 460 ppm and the hydrogen content was 75 ppm, and after treatment, the oxygen amount was 18 ppm and the hydrogen amount was 7 ppm, and the deoxidation and dehydrogenation treatment effects were confirmed.
【００１０】[0010]
（１）溶鋼の脱酸素をAl，Siを使用して行った場合の副
産物であるAl2O3,SiO2の生成がないため、これらを除去
する工程が完全に省略できて、脱酸素処理が可能になっ
た。 （２）鋼中への析出クラスタ−等による非金属介在物の
生成が皆無になった。そして鉄酸化物の酸素の除去がで
き、鋼品質が大幅に向上した。 （３）脱酸素工程の時間の短縮とコストの低下ができ
た。 （４）溶鋼の脱水素を真空脱ガス装置を使用しないで、
脱水素ができた。 （５）脱水素工程の時間の短縮とコストの低下ができ
た。(1) Since deoxidation of molten steel is performed using Al and Si, by-products Al 2 O 3 and SiO 2 are not generated, so the step of removing them can be completely omitted, and deoxidation treatment can be performed. Became possible. (2) The formation of non-metallic inclusions due to precipitated clusters and the like in the steel was eliminated. And the oxygen of iron oxide was able to be removed, and the steel quality was greatly improved. (3) The time for the deoxidation step can be shortened and the cost can be reduced. (4) Dehydrogenation of molten steel without using a vacuum degassing device
I was able to dehydrogenate. (5) The time for the dehydrogenation process can be shortened and the cost can be reduced.
【図１】本発明の処理方法を示した説明図である。FIG. 1 is an explanatory diagram showing a processing method of the present invention.
【図２】本発明の処理方法の説明における一部の拡大図
である。FIG. 2 is an enlarged view of a part of the description of the processing method of the present invention.
【図３】本発明の別の処理方法を示した説明図である。FIG. 3 is an explanatory diagram showing another processing method of the present invention.
【図４】本発明の二重管方式の説明図である。FIG. 4 is an explanatory diagram of a double tube system of the present invention.
１ 溶鋼容器 ２ 耐火性プラグ ３ 溶鋼 ４ ガス吹き込み孔 ５ ランスパイプ ６ ガス吹き込み孔 ７ 外管 ８ 内管 ９ 耐火物 1 Molten Steel Container 2 Refractory Plug 3 Molten Steel 4 Gas Injection Hole 5 Lance Pipe 6 Gas Injection Hole 7 Outer Tube 8 Inner Tube 9 Refractory
───────────────────────────────────────────────────── フロントページの続き (72)発明者 梶 原 洋 三 横浜市瀬谷区三ッ境98−１ (72)発明者 手 代 木 琢 磨 藤沢市城南１−15−９ ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yozo Kajiwara 98-1 Mitsukai, Seya-ku, Yokohama (72) Inventor Teshiro Takuma Masaki Fujisawa 1-15-9
Claims (2)
性プラグを介して揮発性弗化カ−ボンを単独あるいは不
活性気体と混合して、溶鋼中に吹き込み、溶鋼中に溶存
する酸素、水素を除去することを特徴とする溶鋼の脱酸
素および脱水素処理方法。1. A volatile fluorocarbon alone or mixed with an inert gas through a gas-blowing refractory plug attached to a molten steel container and blown into the molten steel to dissolve oxygen in the molten steel. A method for deoxidizing and dehydrogenating molten steel, which comprises removing hydrogen.
−ボンを単独あるいは不活性気体と混合して、溶鋼中に
吹き込み、溶鋼中に溶存する酸素、水素を除去すること
を特徴とする溶鋼の脱酸素および脱水素処理方法。2. A volatile fluorocarbon alone or mixed with an inert gas through a refractory lance pipe and blown into molten steel to remove oxygen and hydrogen dissolved in the molten steel. Method for deoxidizing and dehydrogenating molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27658292A JPH06100925A (en) | 1992-09-21 | 1992-09-21 | Deoxidizing and dehydrogenizing treatment of molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27658292A JPH06100925A (en) | 1992-09-21 | 1992-09-21 | Deoxidizing and dehydrogenizing treatment of molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06100925A true JPH06100925A (en) | 1994-04-12 |
Family
ID=17571475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27658292A Pending JPH06100925A (en) | 1992-09-21 | 1992-09-21 | Deoxidizing and dehydrogenizing treatment of molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06100925A (en) |
-
1992
- 1992-09-21 JP JP27658292A patent/JPH06100925A/en active Pending
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