JPH0339412A - Method for refining molten metal - Google Patents
Method for refining molten metalInfo
- Publication number
- JPH0339412A JPH0339412A JP17620489A JP17620489A JPH0339412A JP H0339412 A JPH0339412 A JP H0339412A JP 17620489 A JP17620489 A JP 17620489A JP 17620489 A JP17620489 A JP 17620489A JP H0339412 A JPH0339412 A JP H0339412A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- power
- container
- magnetic field
- refining
- 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.)
- Granted
Links
- 239000002184 metal Substances 0.000 title claims abstract description 55
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 55
- 238000007670 refining Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 20
- 238000003756 stirring Methods 0.000 claims abstract description 24
- 238000006477 desulfuration reaction Methods 0.000 abstract description 16
- 230000023556 desulfurization Effects 0.000 abstract description 16
- 238000007872 degassing Methods 0.000 abstract description 8
- 230000003009 desulfurizing effect Effects 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000013019 agitation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- 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）
本発明は、取鍋等の精錬用容器内において、溶融金属の
脱りん、脱硫、脱ガスをより効率よ〈実施できる精錬方
法に関するものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a refining method that allows more efficient dephosphorization, desulfurization, and degassing of molten metal in a refining container such as a ladle. be.
（従来の技術）
溶融金属の精錬に際し、脱りん、脱硫、脱ガスの速度を
向上させるための手段としては、大きく攪拌することが
有効であるため、従来からガス攪拌やインペラー攪拌等
が採用されていた。(Prior art) When refining molten metal, large stirring is effective as a means to improve the speed of dephosphorization, desulfurization, and degassing, so gas stirring, impeller stirring, etc. have traditionally been employed. was.
しかし、ガス攪拌において攪拌力を増強するにはガス流
量の増加や真空系の設置が必要である。However, in order to increase the stirring power in gas stirring, it is necessary to increase the gas flow rate and install a vacuum system.
また、ガス攪拌は場面の揺動が激しいため、フリーボー
ドを高くする必要があるが、フリーボードを高くしても
スプラッシュのために地金の付着が著しいなどの問題が
あり、必然的に攪拌力の大きさに制限がある。In addition, gas agitation requires a high freeboard because the scene shakes violently, but even if the freeboard is high, there are problems such as significant metal adhesion due to splash, so it is inevitable that the agitation There is a limit to the amount of force.
また、インペラー攪拌では、ガスの吹込みは不要である
が、耐火物製のインペラーを高温の溶融金属中に挿入し
て高速で回転するため耐久性に問題があり、インペラー
の頻繁な交換が必要であった。そのため、比較的低温（
１３００−１５００″Ｃ）（７）溶融金属では通用例が
あるものの、１５５０°Ｃ以上の溶融金属では適用でき
ない。In addition, impeller agitation does not require blowing gas, but since a refractory impeller is inserted into high-temperature molten metal and rotates at high speed, it has durability issues and requires frequent replacement of the impeller. Met. Therefore, the temperature is relatively low (
1300-1500''C) (7) Although it is commonly used for molten metals, it cannot be applied to molten metals at temperatures of 1550°C or higher.
そこで、これらの問題・を克服するための手段として電
磁攪拌を利用するものが提案されている。Therefore, methods using electromagnetic stirring have been proposed as a means to overcome these problems.
その第１は、例えば特開昭５８−３４１２５号公報に開
示されているように、容器底部に移動磁界装置を設置す
ると共に、該部分にガス体又はガスと精錬剤の混合物を
供給し、移動磁界の溶鉄流動力によってガス気泡を微細
化して分散させることによる精！！Ｉ（脱ガス、脱介在
物、脱硫、脱りん）効果を狙ったものである。The first method is to install a moving magnetic field device at the bottom of the container and supply a gas body or a mixture of gas and refining agent to the bottom of the container, as disclosed in Japanese Patent Application Laid-Open No. 58-34125. The essence of micronizing and dispersing gas bubbles using the molten iron fluidity of the magnetic field! ! I (degassing, removal of inclusions, desulfurization, dephosphorization) effects are aimed at.
また第２は、特開昭５３−１０２２１２号公報、同６２
−１２７４１７号公報、同６２−２３５４１６号公報、
同６２−２３８３２１号公報、同６２−２８７０１１号
公報、同６３−４５３１６号公報等に開示されているよ
うに、容器外周に回転磁界装置を設置し、容器内の溶融
金属を回転させて攪拌混合を行うものである。The second is JP-A-53-102212, JP-A-62.
-127417 publication, 62-235416 publication,
As disclosed in Publication No. 62-238321, Publication No. 62-287011, Publication No. 63-45316, etc., a rotating magnetic field device is installed around the outer circumference of the container, and the molten metal in the container is rotated and mixed. This is what we do.
この攪拌方法では溶融金属は剛体運動をしており、介在
物の凝集等については良好である。また、スラグメタル
の混合を促進する場合は、邪魔板や邪魔棒を溶融金属内
に設置してスラグの巻込みを強制的に引き起こさせるこ
とにより極めて良好な反応速度が得られる。In this stirring method, the molten metal undergoes rigid body motion, and is effective against agglomeration of inclusions. In addition, when promoting the mixing of slag metal, an extremely good reaction rate can be obtained by installing a baffle plate or a baffle rod in the molten metal to forcefully cause the slag to be dragged into the molten metal.
（発明が解決しようとする課題）
しかしながら、前記した電磁攪拌を利用するものは次の
ような問題がある。(Problems to be Solved by the Invention) However, the above-mentioned method using electromagnetic stirring has the following problems.
■ 容器底部に移動磁界を印加する方法一般に工業的に
用いられる容器は、溶融金属が非常に高温であるという
理由から、鉄製容器の内側に耐火煉瓦を張った状態で用
いられる。■ Method of applying a moving magnetic field to the bottom of the container Generally, containers used industrially are made of iron with refractory bricks lined inside the container because the molten metal is at a very high temperature.
特に容器の底部は、熔融金属の流出を防ぐ必要があるた
めに厚みを大きく（通常３０ｃ１１１以上）とり、しか
も鉄皮があるために移動磁界の磁束を容器内の溶融金属
まで到達させるためには移動磁界の周波数を１〜５Ｈｚ
と小さくする必要がある。移動磁界の電磁力によって攪
拌される溶融金属の流速は、移動磁界の周波数と磁極の
極間距離に比例するため、前記したように周波数を低下
させた場合、磁束の移動と溶融金属の移動との間のすべ
りを考慮すると、溶融金属の流速を０．８ｍ／ｓｅｃ以
上とすることは極めて困難である。In particular, the bottom of the container needs to be thick (usually 30c111 or more) to prevent the molten metal from flowing out, and since there is an iron shell, it is difficult for the magnetic flux of the moving magnetic field to reach the molten metal inside the container. Set the frequency of the moving magnetic field to 1-5Hz
It is necessary to make it smaller. The flow velocity of the molten metal stirred by the electromagnetic force of the moving magnetic field is proportional to the frequency of the moving magnetic field and the distance between the magnetic poles, so when the frequency is lowered as described above, the movement of the magnetic flux and the movement of the molten metal are Considering the slippage between the two, it is extremely difficult to increase the flow rate of the molten metal to 0.8 m/sec or more.
また、容器底部に移動磁界を印加する場合、電磁力によ
る回転運動が容器間の溶融金属の上部に伝達するまでの
時間が著しく長くなり、処理時間の延長につながる。Furthermore, when a moving magnetic field is applied to the bottom of the container, the time required for the rotational motion due to electromagnetic force to be transmitted to the upper part of the molten metal between the containers becomes significantly longer, leading to an extension of processing time.
更に、容器底部へ移動磁界を設ける場合は、磁界の印加
面積及び印加半径が大きくとれないため回転力のトルク
が十分に得られないという問題がある。Furthermore, when a moving magnetic field is provided at the bottom of the container, there is a problem that a sufficient torque of rotational force cannot be obtained because the area and radius to which the magnetic field is applied cannot be large.
■ 容器外周に回転磁界印加装置を設置する方法この方
法によってスラグメタルの攪拌を促進し、溶融金属の脱
硫・脱りんを高効率に行うためには、先に挙げた一連の
発明から判るように邪魔板・邪魔棒が必要であり、これ
らの邪魔部材は反応性の高い脱硫又は脱りんフラックス
と激しく衝突するために著しく高い溶損速度を示す。■ Method of installing a rotating magnetic field applying device around the outer circumference of the container. In order to promote stirring of slag metal and desulfurize and dephosphorize molten metal with high efficiency using this method, it is clear from the series of inventions listed above. Baffles and baffle bars are required, and these baffles exhibit a significantly high rate of erosion due to violent collision with the highly reactive desulfurization or dephosphorization flux.
また、容器の内壁耐火物も高速で移動するフラックスと
長時間接触するため、非常に速く溶損し、取鍋補修時間
の増加や、取鍋の保有数増加などの問題が生じる。In addition, since the inner wall refractories of the container are in contact with the flux moving at high speed for a long time, they are eroded very quickly, causing problems such as increased ladle repair time and an increased number of ladles owned.
本発明は上記した従来の問題点を解決するためになされ
たものであり、従来にない強攪拌力を有効に溶融金属に
印加することにより、溶融金属の脱りん・脱硫・脱ガス
を短時間に行なえる方法を提供することを目的としてい
る。The present invention was made to solve the above-mentioned conventional problems, and by effectively applying an unprecedented strong stirring force to molten metal, dephosphorization, desulfurization, and degassing of molten metal can be carried out in a short time. The purpose is to provide a method that can be used to
（課題を解決するための手段）
本発明者は、先ず溶融金属の流速立上がり時間ｔ６を調
査すべく、取鍋内に回転磁界を印加後の溶融金属表面の
流速が定常値になるまでの立上がり時間ｔｏを測定した
ところ、底部へ電磁力を印加した場合は、外周へ印加し
た場合よりも１０倍以上の時間がかかり、処理時間の点
から不適当であることがわかった。(Means for Solving the Problems) First, in order to investigate the rise time t6 of the flow velocity of molten metal, the inventor of the present invention first investigated the rise time t6 of the flow velocity on the surface of the molten metal after applying a rotating magnetic field in the ladle until the flow velocity on the surface of the molten metal reached a steady value. When the time to was measured, it was found that applying the electromagnetic force to the bottom took more than 10 times as long as applying it to the outer periphery, which was inappropriate in terms of processing time.
これは、底部への電磁力印加が溶融金属のごく一部にし
か作用しないため、底部の回転力が上部へ伝達するのに
時間がかかるためである。This is because the application of electromagnetic force to the bottom acts on only a small portion of the molten metal, so it takes time for the rotational force at the bottom to be transmitted to the top.
次に溶融金属の脱硫速度を調査すべく、回転磁界印加中
の取鍋内溶融金属の流速が定常になった後に、上方から
脱硫フランクス１０ｋｇ／ＴＯＮ（８０％Ｃａｂ、２０
％ｃａＦｚ）を投入し、脱硫速度を測定した。Next, in order to investigate the desulfurization rate of the molten metal, after the flow rate of the molten metal in the ladle became steady while applying a rotating magnetic field, a desulfurization flank of 10 kg/TON (80% Cab, 20
%caFz) and measured the desulfurization rate.
脱硫速度は、底部へ電磁力を印加する方法が邪魔板なし
で外周へ電磁力を印加する方法の２０倍、邪魔板ありで
外周へ電磁力を印加する方法の３倍の値を得た。邪魔板
ありの場合の外周への電磁力印加は脱硫速度が大きくな
ると下部への電磁力印加の方が優れているという結果が
得られた。これは下部へ電磁力を印加した場合には、第
６図に示すようにスラグが取鍋の中央へ集められ、さら
に中心に集中した渦によって溶融金属中の全体へ分散し
ているためと考えられる。The desulfurization rate was 20 times higher by applying electromagnetic force to the bottom than by applying electromagnetic force to the outer circumference without a baffle plate, and three times faster than by applying electromagnetic force to the outer circumference with a baffle plate. The results showed that when the desulfurization rate increases, applying electromagnetic force to the lower part of the specimen with a baffle plate is better than applying it to the outer circumference. This is thought to be because when electromagnetic force is applied to the lower part, the slag is collected in the center of the ladle as shown in Figure 6, and is further dispersed throughout the molten metal by the vortices concentrated at the center. It will be done.
これに対し、外周への電磁力印加は邪魔板６をつけてス
ラグを分散させても、溶融金属の流れが剛体運動である
ため、第７図に示すように分散したスラグが溶融金属の
上部にしか分散しないため脱硫速度が劣ったと考えられ
る。On the other hand, when applying electromagnetic force to the outer periphery, even if the baffle plate 6 is attached to disperse the slag, the flow of the molten metal is a rigid body motion, so the dispersed slag is pushed to the top of the molten metal as shown in Fig. 7. It is thought that the desulfurization rate was poor because it was only dispersed in the water.
なお、このことは脱ガスについても同様で、スラグの代
わりに気泡が巻込まれる。Note that this also applies to degassing, and air bubbles are drawn in instead of slag.
本発明は上記した調査の結果得られた知見に基ついてな
されたものであり、その第１は、精錬用容器内の溶融金
属に該容器の外側面から回転磁界を印加し、溶融金属を
攪拌することによってＩ＃錬する電磁攪拌による精錬方
法において、容器の外側面から容器内の溶融金属に印加
する電磁力又は磁界の移動速度を、容器の上部側に対し
て下部側を大きくすると共に、更に溶融金属に精錬剤を
供給することを要旨とするものである。The present invention has been made based on the knowledge obtained as a result of the above-mentioned investigation, and the first is that a rotating magnetic field is applied to the molten metal in the refining container from the outer surface of the container to stir the molten metal. In a refining method using electromagnetic stirring that involves I# refining, the moving speed of the electromagnetic force or magnetic field applied from the outer surface of the container to the molten metal in the container is made larger on the lower side than on the upper side of the container, and Furthermore, the gist is to supply a refining agent to the molten metal.
また第２の本発明は、前記第１の本発明方法において、
溶融金属の全体又は一部を減圧状態となすことを要旨と
するものである。Further, the second invention provides the method of the first invention, comprising:
The gist of this is to bring all or part of the molten metal into a reduced pressure state.
更に第３の本発明は前記第１又は第２の本発明方法にお
いて、電磁攪拌に加えてガス攪拌を併用することを要旨
とするものである。Furthermore, a third aspect of the present invention is that in the method of the first or second aspect of the present invention, gas stirring is used in addition to electromagnetic stirring.
本発明において容器の外周に設けた電磁力印加装置によ
って印加する電磁力を上部側より下部側を大きくするの
は、溶融金属の流速を定常値に立上げるためには、上下
方向全体に攪拌する必要があり、溶融金属製錬の場合に
は、下部の回転速度を上部よりはやくする必要があるた
めである。In the present invention, the reason why the electromagnetic force applied by the electromagnetic force applying device provided on the outer periphery of the container is made larger on the lower side than on the upper side is that in order to raise the flow velocity of the molten metal to a steady value, it is necessary to stir the molten metal in the entire vertical direction. This is because, in the case of molten metal smelting, the rotation speed of the lower part needs to be faster than that of the upper part.
（実 施 例）
以下本発明方法を添付図面に示す実施例に基づいて説明
する。(Example) The method of the present invention will be explained below based on the example shown in the attached drawings.
その１）
第１図は取鍋１の外周部に、その上下方向に３分割した
回転移動磁界印加装置（以下「印加装置」と略す）２１
〜２．を設置した例を示したものであり、初期には３つ
の印加装置２１〜２３の磁界を同一速度、同一電力で取
鍋１内の溶融金属に印加させた。Part 1) Figure 1 shows a rotary moving magnetic field applying device (hereinafter abbreviated as "applying device") 21 which is divided into three parts in the vertical direction on the outer periphery of the ladle 1.
~2. In this example, the magnetic fields of the three application devices 21 to 23 were initially applied to the molten metal in the ladle 1 at the same speed and with the same power.
そして、その後印加装置２．の電力を初期の１／２印加
装置２！の電力を初期のまま、印加装置２３の電力を初
期の２倍としたところ、取鍋ｌ内の場面形状は、第２図
（イ）に示す初期の状態から同図（ロ）に示す如くにな
った。Then, applying device 2. Applying 1/2 of the initial power to the device 2! When the electric power of the application device 23 was doubled from the initial value while keeping the electric power of Became.
この状態下において下記の条件で脱硫処理をしたところ
第３図に示すように底部から攪拌した時の２倍、外周か
ら同一電力で攪拌したときの４倍の脱硫速度を得た。Under these conditions, desulfurization treatment was carried out under the following conditions, and as shown in FIG. 3, the desulfurization rate was twice that of stirring from the bottom and four times that of stirring from the outer periphery with the same power.
取 鍋： ２５０ＴＯＮ
電磁場電磁カニ ２００ｋｗ Ｘ ３ （初期）溶鋼温
度： １６２０°Ｃ
フラックス＝８０％Ｃａｂ、２０％ＣａＦｚ １０ｋ
ｇ／ＴＯＮその２）
その１）と同じ印加装置２．〜２．を設置した２５０Ｔ
ＯＮ取鍋ｌを第４図に示すように減圧可能なチェンバー
３に導入後Ｉ Ｔｏｒｒまで減圧した。Ladle: 250TON Electromagnetic crab 200kw
g/TON Part 2) Same application device as Part 1) 2. ~2. 250T with installed
As shown in FIG. 4, the ON ladle 1 was introduced into a chamber 3 capable of reducing the pressure, and then the pressure was reduced to I Torr.
そして、初めの３０秒間に２００に−の電力を印加装置
２．〜２３に印加して全体の溶鋼流動を確保し、３０秒
後に印加装置２．の電力を１１００ｋ 、印加装置２、
の電力を４００ｋｗに変更して１０〜２０分間脱炭処理
を行った。Then, for the first 30 seconds, a power of 200 - is applied to the device 2. 23 to ensure the entire molten steel flow, and after 30 seconds, the application device 2. The power of 1100k, application device 2,
The power was changed to 400 kW and decarburization was performed for 10 to 20 minutes.
更に脱炭処理中に、取鍋１内の溶鋼４にＡｒガスのバブ
リング（２Ｎ ｍ”／ａ＋ｉｎ）を追加して実施した。Furthermore, during the decarburization treatment, Ar gas bubbling (2N m''/a+in) was added to the molten steel 4 in the ladle 1.
なお第４図中、５はランスを示す。In addition, in FIG. 4, 5 indicates a lance.
これらの場合について夫々サンプリングにより脱ガス速
度定数を求めた結果を第５図に示す。The results of degassing rate constants determined by sampling in each of these cases are shown in FIG.
この第５図よりわかるように、ガス攪拌を併用すること
により７分間の処理にて炭素濃度２０ｐρ繭の極低炭素
鋼を溶製できた。As can be seen from FIG. 5, ultra-low carbon steel with a carbon concentration of 20 pρ could be produced in a 7-minute treatment by using gas stirring in combination.
（発明の効果）
以上説明したように本発明方法により、溶融金属の脱り
ん、脱硫、脱ガスの処理効率を著しく高めることが可能
となった。(Effects of the Invention) As explained above, the method of the present invention makes it possible to significantly improve the processing efficiency of dephosphorization, desulfurization, and degassing of molten metal.
第１図は本発明方法に使用する回転移動磁界印加装置の
設置位置説明図で、（イ）は平面図、（ロ）は正面図、
第２図は処理中の場面形状の説明図で、（イ）は初期、
（ロ）は製錬中、第３図は処理中の硫黄濃度の移動を示
す図、第４図は第２及び第３の本発明方法の説明図、第
５図は処理中の炭素濃度の時間的変化を示す図、第６図
は底部に電磁力を印加させたときのスラグの分散挙動を
示す図、第７図は外周部に電磁力を印加させたときの第
６図と同様の図である。
１は取鍋、２Ｉ〜２３は回転移動磁界印加装置、３はチ
ェンバー、４は）容鋼、５はランス。
（ロ）
第３図
！６Ｆ１６（分）FIG. 1 is an explanatory diagram of the installation position of the rotary moving magnetic field application device used in the method of the present invention, in which (a) is a plan view, (b) is a front view,
Figure 2 is an explanatory diagram of the scene shape during processing; (a) is the initial stage;
(B) shows the movement of sulfur concentration during smelting, FIG. 3 shows the movement of sulfur concentration during treatment, FIG. Fig. 6 shows the dispersion behavior of slag when electromagnetic force is applied to the bottom, and Fig. 7 shows the same behavior as Fig. 6 when electromagnetic force is applied to the outer periphery. It is a diagram. 1 is a ladle, 2I to 23 are rotating magnetic field applying devices, 3 is a chamber, 4 is a steel container, and 5 is a lance. (b) Figure 3! 6F16 (minutes)
Claims (3)
転磁界を印加し、溶融金属を攪拌することによって精錬
する電磁攪拌による精錬方法において、容器の外側面か
ら容器内の溶融金属に印加する電磁力又は磁界の移動速
度を、容器の上部側に対して下部側を大きくすると共に
、更に溶融金属に精錬剤を供給することを特徴とする溶
融金属の精錬方法。(1) In a refining method using electromagnetic stirring, in which molten metal in a refining container is refined by applying a rotating magnetic field from the outer surface of the container and stirring the molten metal, the molten metal in the container is applied from the outer surface of the container to the molten metal in the container. A method for refining molten metal, which comprises increasing the moving speed of an applied electromagnetic force or magnetic field on the lower side of the container than on the upper side of the container, and further supplying a refining agent to the molten metal.
体又は一部を減圧状態となすことを特徴とする溶融金属
の精錬方法。(2) A method for refining molten metal according to claim 1, characterized in that the entire or part of the molten metal is brought into a reduced pressure state.
拌に加えてガス攪拌を併用することを特徴とする溶融金
属の精錬方法。(3) A method for refining molten metal according to claim 1 or 2, characterized in that gas stirring is used in combination with electromagnetic stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17620489A JP2847774B2 (en) | 1989-07-07 | 1989-07-07 | Refining method of molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17620489A JP2847774B2 (en) | 1989-07-07 | 1989-07-07 | Refining method of molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0339412A true JPH0339412A (en) | 1991-02-20 |
| JP2847774B2 JP2847774B2 (en) | 1999-01-20 |
Family
ID=16009447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17620489A Expired - Lifetime JP2847774B2 (en) | 1989-07-07 | 1989-07-07 | Refining method of molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847774B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2812661A1 (en) * | 2000-06-05 | 2002-02-08 | Sanyo Special Steel Co Ltd | HIGH-CLEAN STEEL AND PROCESS FOR PRODUCING THE SAME |
| GB2406580A (en) * | 2000-06-05 | 2005-04-06 | Sanyo Special Steel Co Ltd | High-cleanliness steel and processes for producing the same |
| GB2410253A (en) * | 2000-06-05 | 2005-07-27 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
-
1989
- 1989-07-07 JP JP17620489A patent/JP2847774B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2812661A1 (en) * | 2000-06-05 | 2002-02-08 | Sanyo Special Steel Co Ltd | HIGH-CLEAN STEEL AND PROCESS FOR PRODUCING THE SAME |
| WO2001094648A3 (en) * | 2000-06-05 | 2002-08-08 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| GB2381537A (en) * | 2000-06-05 | 2003-05-07 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| GB2406580A (en) * | 2000-06-05 | 2005-04-06 | Sanyo Special Steel Co Ltd | High-cleanliness steel and processes for producing the same |
| GB2410253A (en) * | 2000-06-05 | 2005-07-27 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| GB2406580B (en) * | 2000-06-05 | 2005-09-07 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| GB2410253B (en) * | 2000-06-05 | 2005-09-14 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| GB2381537B (en) * | 2000-06-05 | 2005-09-14 | Sanyo Special Steel Co Ltd | High-cleanliness steel and process for producing the same |
| US7396378B2 (en) | 2000-06-05 | 2008-07-08 | Sanyo Special Steel Co., Ltd. | Process for producing a high cleanliness steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2847774B2 (en) | 1999-01-20 |
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