JPH0847752A - Method for cleaning molten steel in tundish - Google Patents
Method for cleaning molten steel in tundishInfo
- Publication number
- JPH0847752A JPH0847752A JP20302094A JP20302094A JPH0847752A JP H0847752 A JPH0847752 A JP H0847752A JP 20302094 A JP20302094 A JP 20302094A JP 20302094 A JP20302094 A JP 20302094A JP H0847752 A JPH0847752 A JP H0847752A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- tundish
- inert gas
- side wall
- steel surface
- 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
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造において
取鍋からタンディッシュ内に溶鋼の注入を開始する際、
急激な溶鋼の空気酸化を防止し、タンディッシュ内溶鋼
の清浄化を図る方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the start of pouring molten steel into a tundish from a ladle in continuous casting of steel.
The present invention relates to a method for preventing rapid air oxidation of molten steel and cleaning the molten steel in a tundish.
【０００２】[0002]
【従来の技術】鋼の連続鋳造において、タンディッシュ
は取鍋と鋳型間に位置し、操業、品質上最も重要な役割
を果たす部分の一つである。2. Description of the Related Art In continuous casting of steel, the tundish is located between the ladle and the mold, and is one of the most important parts in terms of operation and quality.
【０００３】その機能は、鋳型内への溶鋼供給量の調
節、溶鋼貯蔵、介在物の分離除去等である。特に、介在
物除去の機能は、近年の鋼材品質厳格化に伴い極めて重
要な機能となっている。Its functions are to control the amount of molten steel supplied into the mold, store molten steel, and separate and remove inclusions. In particular, the function of removing inclusions has become an extremely important function as the quality of steel materials has become stricter in recent years.
【０００４】しかし、取鍋からタンディッシュに溶鋼を
注入する際、空気酸化による溶鋼汚染の問題が生じるた
め、タンディッシュにおける介在物除去効果が十分に発
揮されていないのが現状である。However, when the molten steel is poured into the tundish from the ladle, the problem of contamination of the molten steel due to air oxidation arises, and therefore, the effect of removing inclusions in the tundish is not sufficiently exerted at present.
【０００５】このため、タンディッシュ内における溶鋼
汚染防止を目的として種々の方法が検討され、実用化さ
れている。例えば、特開昭５９―１０５５号公報に記載
されているように、耐火ボード蓋で覆われたタンディッ
シュ内に不活性ガスを吹き込むことにより、注入溶鋼の
空気酸化防止が図られている。Therefore, various methods have been studied and put to practical use for the purpose of preventing molten steel contamination in the tundish. For example, as described in JP-A-59-1055, by blowing an inert gas into a tundish covered with a refractory board lid, it is possible to prevent the air oxidation of the injected molten steel.
【０００６】また、特開昭６０―２６１６５１号公報で
は、取鍋から溶鋼を注入する際のタンディッシュ内の湯
面上昇速度を限定することにより空気酸化を抑制する方
法が提案され、或程度の効果を発揮している。Further, JP-A-60-261651 proposes a method of suppressing air oxidation by limiting the rising rate of the molten metal in the tundish when pouring molten steel from a ladle. It is effective.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、タンデ
ィッシュを耐火ボード蓋で覆い不活性ガスでシールする
方法については、タンディッシュや耐火ボード自体が高
温で変形するため、空気酸化を防止できる程度までタン
ディッシュ内の酸素分圧を低減することはできない。However, as for the method of covering the tundish with the refractory board lid and sealing with the inert gas, the tundish or the refractory board itself is deformed at a high temperature, and thus the tundish is prevented to the extent that air oxidation can be prevented. It is not possible to reduce the oxygen partial pressure in the dish.
【０００８】また、鋳込初期は注入流による攪拌エネル
ギーが大きいため、反応界面積が増大し、空気酸化速度
は定常時に比べて格段に速い。Further, since the stirring energy by the injection flow is large at the initial stage of casting, the reaction interfacial area increases, and the air oxidation rate is remarkably faster than in the steady state.
【０００９】このため、鋳込初期においてタンディッシ
ュ内の湯面上昇速度を限定する方法は、空気酸化を幾分
抑制する効果があるものの十分な汚染防止対策にはなっ
ていない。For this reason, the method of limiting the rate of rise of the molten metal in the tundish at the initial stage of casting has an effect of suppressing air oxidation to some extent, but is not a sufficient measure for preventing pollution.
【００１０】これらの問題を鑑み、本発明は、耐火ボー
ド蓋等の大がかりな設備を必要とせず、簡便な方法で最
も激しい鋳込初期の溶鋼汚染をすみやかに低減し、さら
にタンディッシュにおける介在物除去効果をも向上させ
るタンディッシュ内溶鋼の清浄化方法を提示することを
目的とするものである。In view of these problems, the present invention does not require large-scale equipment such as a refractory board lid and promptly reduces the most severe molten steel contamination at the initial stage of casting by a simple method, and further, inclusions in the tundish. The purpose of the present invention is to provide a method for cleaning molten steel in a tundish that also improves the removal effect.
【００１１】[0011]
【課題を解決するための手段】本発明は、取鍋からタン
ディッシュに溶鋼を注入する際、注入点のタンディッシ
ュ側壁から不活性ガスを吹き込むことを特徴とするタン
ディッシュ内溶鋼の清浄化方法に関するものである。SUMMARY OF THE INVENTION The present invention is a method for cleaning molten steel in a tundish, characterized in that when injecting molten steel from a ladle into a tundish, an inert gas is blown from the side wall of the tundish at the pouring point. It is about.
【００１２】[0012]
【作用】一般に、取鍋からタンディッシュ内に溶鋼を注
入する際、取鍋ロングノズルが湯面下に浸漬されるまで
は注入流の攪拌エネルギーが非常に大きいため、鋳込初
期は溶鋼表面積が増大し、（１）式の反応で示される空
気酸化に起因して多数の介在物が生成する。[Operation] Generally, when pouring molten steel from the ladle into the tundish, the stirring energy of the pouring flow is very large until the long nozzle of the ladle is immersed below the surface of the molten metal. And a large number of inclusions are generated due to the air oxidation shown in the reaction of the equation (1).
【００１３】[0013]
【化１】 ４Ａｌ（溶鋼中）＋３Ｏ2（空気中）＝２Ａｌ2Ｏ3（介在物） （１）## STR1 ## 4 Al (in molten steel) + 3O 2 (in air) = 2Al 2 O 3 (inclusions) (1)
【００１４】このように、鋳込初期の空気酸化速度は定
常状態のそれに比べて極めて速く、タンディッシュにお
ける溶鋼汚染の最大の原因となっている。As described above, the air oxidation rate in the initial stage of casting is extremely higher than that in the steady state, which is the largest cause of molten steel contamination in the tundish.
【００１５】そこで、本発明者らは、この鋳込初期の空
気酸化を防止すると共に、取鍋から持ち込まれた介在物
の浮上分離を促進する方法について種々の検討を行った
結果、注入点のタンディッシュ側壁から不活性ガスを吹
き込むことが有効であることを見いだした。Therefore, the inventors of the present invention conducted various studies on a method of preventing air oxidation at the initial stage of casting and promoting floating separation of inclusions brought in from the ladle. We have found that it is effective to blow an inert gas from the side wall of the tundish.
【００１６】図１は本発明を説明するための図、図２は
従来のタンディッシュシール方法を説明するための図で
ある。FIG. 1 is a diagram for explaining the present invention, and FIG. 2 is a diagram for explaining a conventional tundish sealing method.
【００１７】取鍋１から溶鋼２をロングノズル６を通し
てタンディッシュ３内に注入する際、注入点のタンディ
ッシュ側壁に設けたポーラスプラグ４から不活性ガス５
を吹き込むと、溶鋼２中および雰囲気中に同時に不活性
ガス５を供給することができる。When the molten steel 2 is poured from the ladle 1 into the tundish 3 through the long nozzle 6, the porous plug 4 provided on the side wall of the tundish at the pouring point to the inert gas 5
By blowing in, the inert gas 5 can be simultaneously supplied into the molten steel 2 and the atmosphere.
【００１８】溶鋼表面７より下部から溶鋼２中に吹き込
まれた不活性ガス５―１は、溶鋼２中で介在物の浮上分
離を促進すると共に、溶鋼２中から雰囲気中に移行する
ことにより溶鋼表面７の酸素濃度を低下させ、空気酸化
を抑制する。The inert gas 5-1 blown into the molten steel 2 from below the molten steel surface 7 promotes levitation separation of inclusions in the molten steel 2 and moves from the molten steel 2 to the atmosphere to melt the molten steel. The oxygen concentration on the surface 7 is reduced and air oxidation is suppressed.
【００１９】一方、溶鋼表面７より上部から雰囲気中に
吹き込まれた不活性ガス５―２は溶鋼表面をカーテン状
に覆い、雰囲気から溶鋼表面をシールする効果を有す
る。On the other hand, the inert gas 5-2 blown into the atmosphere from above the molten steel surface 7 has the effect of covering the molten steel surface in a curtain shape and sealing the molten steel surface from the atmosphere.
【００２０】従来の空気酸化防止はタンディッシュを耐
火ボード蓋１０で覆い、上部ノズル８から溶鋼表面７に
不活性ガス５を吹き付ける方法で行われているが、本方
法では周囲の酸素９を巻き込み、溶鋼表面７に吹き付け
ることになるため、溶鋼２の空気酸化を促進する結果と
なる。Conventional air oxidation prevention is carried out by covering the tundish with a refractory board lid 10 and spraying an inert gas 5 from the upper nozzle 8 onto the molten steel surface 7. In this method, ambient oxygen 9 is entrained. Since it is sprayed on the molten steel surface 7, the result is that the air oxidation of the molten steel 2 is promoted.
【００２１】しかし、本発明によれば、タンディッシュ
側壁の溶鋼表面より上部から雰囲気中に吹き込まれた不
活性ガス５―２は溶鋼表面７を水平に流れるため、雰囲
気からの酸素９巻き込みがなく、タンディッシュ３内の
酸素濃度が高い状態でも十分空気酸化を防止できる。According to the present invention, however, since the inert gas 5-2 blown into the atmosphere from above the molten steel surface of the tundish side wall flows horizontally on the molten steel surface 7, there is no entrainment of oxygen 9 from the atmosphere. Even in the state where the oxygen concentration in the tundish 3 is high, air oxidation can be sufficiently prevented.
【００２２】一方、タンディッシュ底部から不活性ガス
を吹き込み、溶鋼表面の酸素濃度を下げることにより空
気酸化を防止する方法も考えられる。On the other hand, a method of preventing air oxidation by injecting an inert gas from the bottom of the tundish to reduce the oxygen concentration on the surface of the molten steel can be considered.
【００２３】この場合不活性ガスは全量溶鋼中に吹き込
まれるため、タンディッシュ側壁からのガス吹き込みに
比べて、溶鋼表面に供給される攪拌エネルギーは大きく
なる。In this case, since the entire amount of the inert gas is blown into the molten steel, the stirring energy supplied to the surface of the molten steel becomes larger than that of the gas blown from the side wall of the tundish.
【００２４】さらに、溶鋼静圧の高いタンディッシュ底
部で生成した気泡は浮上中に膨張するため、この膨張エ
ネルギーを考慮すると、溶鋼表面に供給される攪拌エネ
ルギーはさらに増加する。Further, the bubbles generated at the bottom of the tundish with a high static pressure of molten steel expand during floating, so the stirring energy supplied to the surface of the molten steel further increases in consideration of this expansion energy.
【００２５】その結果、タンディッシュ底部からの不活
性ガス吹き込みでは、雰囲気中の酸素濃度を低下させる
効果よりも、溶鋼表面積を増加させる効果が大きくな
り、溶鋼の空気酸化速度はかえって速くなる。As a result, by blowing the inert gas from the bottom of the tundish, the effect of increasing the surface area of the molten steel is greater than the effect of decreasing the oxygen concentration in the atmosphere, and the air oxidation rate of the molten steel is rather high.
【００２６】以上に述べたように、タンディッシュ側壁
からの不活性ガス吹き込みは、溶鋼表面に供給される攪
拌エネルギーを最小限にし溶鋼表面積の増大を抑え、且
つ溶鋼表面の酸素濃度を低減できるため、タンディッシ
ュ注入点の空気酸化を効率的に防止できる方法である。As described above, the blowing of the inert gas from the side wall of the tundish can minimize the stirring energy supplied to the surface of the molten steel, suppress the increase of the surface area of the molten steel, and reduce the oxygen concentration on the surface of the molten steel. This is a method that can efficiently prevent air oxidation at the tundish injection point.
【００２７】タンディッシュ側壁における不活性ガス吹
き込み用ポーラスプラグの幅は、取鍋からタンディッシ
ュに溶鋼を注入するロングノズルの外径以上が良く、好
ましくは注入溶鋼流の影響によりロングノズルと同心円
状に盛り上がった溶鋼表面の直径以上とする。The width of the porous plug for injecting the inert gas on the side wall of the tundish should be equal to or larger than the outer diameter of the long nozzle for injecting the molten steel from the ladle into the tundish, preferably concentric with the long nozzle due to the influence of the injected molten steel flow. The diameter should be equal to or larger than the diameter of the molten steel surface that is raised.
【００２８】タンディッシュ側壁からの不活性ガス吹き
込みは、必ずしも両方の側壁から実施する必要はなく、
一方から実施しても良い。この不活性ガスは微細である
ほど介在物浮上に効果があり、１０ｍｍφ以下の気泡と
して吹き込むことが好ましい。Blowing the inert gas from the tundish side wall does not necessarily have to be carried out from both side walls.
You may carry out from one side. The finer this inert gas is, the more effective it is for floating inclusions, and it is preferable to blow it as bubbles of 10 mmφ or less.
【００２９】また、不活性ガスの吹き込み流量は５〜１
００Ｎｌ／ｍｉｎ程度が好ましい。すなわち、５Ｎｌ／
ｍｉｎ未満では溶鋼表面のシール効果が不十分であり、
また１００Ｎｌ／ｍｉｎ超では溶鋼のボイングが激しく
溶鋼表面積が大きくなり過ぎ、この場合も十分な酸化防
止効果は得られない。The flow rate of the inert gas blown is 5 to 1
It is preferably about 00 Nl / min. That is, 5Nl /
If it is less than min, the sealing effect on the surface of molten steel is insufficient,
On the other hand, if it exceeds 100 Nl / min, the boiling of molten steel is severe and the surface area of molten steel becomes too large, and in this case also, a sufficient antioxidant effect cannot be obtained.
【００３０】さらに、鋳込み初期の最も溶鋼汚染が激し
い場合だけでなく、鋳造全域に渡って本発明を適用する
ことは十分可能であり、全体の鋳片品質を向上させるた
めにも有効な方法である。Furthermore, it is possible to apply the present invention not only to the case where the molten steel is most heavily contaminated at the initial stage of casting, but also to apply the present invention to the entire casting area, which is an effective method for improving the quality of the entire cast piece. is there.
【００３１】[0031]
【実施例】以下に、実施例及び比較例を挙げて、本発明
について説明する。EXAMPLES The present invention will be described below with reference to Examples and Comparative Examples.
【００３２】[0032]
【実施例１】図１に示す容量５０ｔのタンディッシュ３
（深さ１．０×幅２．０×長さ８．０ｍ）には、その側
壁に不活性ガス供給管に接続されたガス吹き込み用ポー
ラスプラグ４が設けられている。Example 1 A tundish 3 having a capacity of 50 ton shown in FIG.
A gas-blowing porous plug 4 connected to an inert gas supply pipe is provided on the side wall (depth 1.0 × width 2.0 × length 8.0 m).
【００３３】ここで使用したポーラスプラグ４の幅は、
ロングノズル６外径（２００ｍｍ）の２倍とした。The width of the porous plug 4 used here is
It was twice the outer diameter (200 mm) of the long nozzle 6.
【００３４】成分Ｃ：５０ｐｐｍ、Ｓｉ：０．０１５
％、Ｍｎ：０．２５％、Ｐ：０．０２％、Ｓ：０．０１
％、Ａｌ：０．０３５％、温度１５５０℃（タンディッ
シュ内）の溶鋼２５０ｔを取鍋１からタンディッシュ３
内に２５ｔ／ｍｉｎで注入を開始すると共に、タンディ
ッシュ側壁の２個のポーラスプラグ（アルミナ製）４か
ら初期気泡径１０ｍｍφのＡｒガス５を各々２５Ｎｌ／
ｍｉｎずつ吹き込んだ。Component C: 50 ppm, Si: 0.015
%, Mn: 0.25%, P: 0.02%, S: 0.01
%, Al: 0.035%, temperature 1550 ° C. (in tundish) 250 t molten steel, ladle 1 to tundish 3
The injection is started at 25 t / min, and 25 Nl / each of Ar gas 5 having an initial bubble diameter of 10 mmφ is supplied from the two porous plugs (made of alumina) 4 on the tundish side wall.
I blew it in min.
【００３５】タンディッシュ１内に溶鋼４が充満した
後、溶鋼注入量を８ｔ／ｍｉｎまで絞ると共に、鋳型に
鋳造を開始した。この時、タンディッシュ出側の溶鋼中
全酸素量は注入初期から一定値を示し、安定して全酸素
量２０ｐｐｍを確保できた。After the molten steel 4 was filled in the tundish 1, the molten steel injection amount was reduced to 8 t / min and casting was started in the mold. At this time, the total amount of oxygen in the molten steel on the outlet side of the tundish showed a constant value from the initial stage of injection, and a total amount of oxygen of 20 ppm could be stably secured.
【００３６】これにより、溶鋼汚染は確実に防止でき、
圧延後の成品には表面欠陥は全く発生しなかった。By this, the contamination of molten steel can be surely prevented,
No surface defects occurred in the rolled product.
【００３７】[0037]
【実施例２】図１に示すタンディッシュ３を用いて操業
した例であり、該タンディッシュ３は実施例１と同一の
寸法を有するもので、不活性ガス吹き込みはタンディッ
シュ側壁の一方に設けた４００ｍｍ幅のガス吹き込み用
ポーラスプラグ４から行った。EXAMPLE 2 This is an example of operation using the tundish 3 shown in FIG. 1, the tundish 3 has the same dimensions as in Example 1, and the inert gas blowing is provided on one side wall of the tundish. It was performed from the porous plug 4 for gas injection having a width of 400 mm.
【００３８】成分Ｃ：５０ｐｐｍ、Ｓｉ：０．０１５
％、Ｍｎ：０．２５％、Ｐ：０．０２％、Ｓ：０．０１
％、Ａｌ：０．０３５％、温度１５５０℃（タンディッ
シュ内）の溶鋼２５０ｔを取鍋１からタンディッシュ３
内に２５ｔ／ｍｉｎで注入を開始すると同時に、タンデ
ィッシュ側壁の一方にあるポーラスプラグ（アルミナ
製）４から初期気泡径１０ｍｍφのＡｒガス５を７０Ｎ
ｌ／ｍｉｎで吹き込んだ。Component C: 50 ppm, Si: 0.015
%, Mn: 0.25%, P: 0.02%, S: 0.01
%, Al: 0.035%, temperature 1550 ° C. (in tundish) 250 t molten steel, ladle 1 to tundish 3
At the same time as starting the injection at 25 t / min, 70 N of Ar gas 5 having an initial bubble diameter of 10 mmφ is supplied from the porous plug (made of alumina) 4 on one side of the tundish side wall.
Blow at 1 / min.
【００３９】タンディッシュ１内に溶鋼２が充満した
後、溶鋼注入量を８ｔ／ｍｉｎまで絞ると共に、鋳型に
鋳造を開始した。この時、タンディッシュ出側の溶鋼中
全酸素量は注入初期から一定値を示し、安定して全酸素
量１９ｐｐｍを確保できた。After the molten steel 2 was filled in the tundish 1, the molten steel injection amount was reduced to 8 t / min and casting was started in the mold. At this time, the total oxygen content in the molten steel on the outlet side of the tundish showed a constant value from the beginning of injection, and a stable total oxygen content of 19 ppm could be secured.
【００４０】これにより、溶鋼汚染は確実に防止でき、
圧延後の成品には表面欠陥は全く発生しなかった。With this, the contamination of molten steel can be surely prevented,
No surface defects occurred in the rolled product.
【００４１】[0041]
【比較例１】図２のタンディッシュ３を用いて操業した
例であり、該タンディッシュ３は実施例１と同一の寸法
を有するもので、タンディッシュ上部は耐火ボード蓋１
０で覆った。COMPARATIVE EXAMPLE 1 This is an example of operation using the tundish 3 of FIG. 2, the tundish 3 has the same dimensions as in Example 1, and the upper part of the tundish is the refractory board lid 1.
Covered with 0.
【００４２】タンディッシュ上部に設けたノズル８から
Ａｒガス５を１０００Ｎｌ／ｍｉｎで吹き付け、成分
Ｃ：５０ｐｐｍ、Ｓｉ：０．０１５％、Ｍｎ：０．２５
％、Ｐ：０．０２％、Ｓ：０．０１％、Ａｌ：０．０３
５％、温度１５５０℃（タンディッシュ内）の溶鋼２５
０ｔを取鍋１からタンディッシュ３内に２５ｔ／ｍｉｎ
で注入を開始した。Ar gas 5 was sprayed at 1000 Nl / min from a nozzle 8 provided on the upper part of the tundish, and component C: 50 ppm, Si: 0.015%, Mn: 0.25.
%, P: 0.02%, S: 0.01%, Al: 0.03
Molten steel 25, 5%, temperature 1550 ° C (in tundish)
0t from ladle 1 to tundish 3 25t / min
The injection started at.
【００４３】タンディッシュ３に溶鋼２が充満した後、
溶鋼注入量を８ｔ／ｍｉｎまで絞ると共に、鋳型に鋳造
を開始した。After the tundish 3 is filled with the molten steel 2,
The molten steel injection amount was reduced to 8 t / min and casting was started in a mold.
【００４４】注入初期から溶鋼中全酸素量は８０ｐｐｍ
あり、その後徐々に低下したが、最終到達値は５０ｐｐ
ｍであった。このため、注入初期の溶鋼汚染防止機能及
びその後の介在物除去効果の向上は見られず、圧延後の
成品には表面欠陥が発生した。From the beginning of injection, the total oxygen content in the molten steel is 80 ppm
Yes, then gradually decreased, but the final reached value is 50 pp
It was m. Therefore, the function of preventing molten steel contamination at the initial stage of injection and the effect of removing inclusions thereafter were not improved, and surface defects occurred in the product after rolling.
【００４５】[0045]
【発明の効果】以上のごとく、本発明のタンディッシュ
内溶鋼の清浄化方法によれば、大がかりな設備を必要と
せず、最も激しい鋳込初期の溶鋼汚染をすみやかに低減
し、さらにタンディッシュにおける介在物除去効果をも
向上できるため、鋳片の品質は極めて向上する。As described above, according to the method for cleaning molten steel in a tundish of the present invention, no large-scale equipment is required, the molten steel contamination at the earliest stage of casting is promptly reduced, and further in the tundish. Since the effect of removing inclusions can also be improved, the quality of the cast piece is significantly improved.
【図１】本発明を説明するための図。FIG. 1 is a diagram for explaining the present invention.
【図２】従来のタンディッシュシール方法を説明するた
めの図。FIG. 2 is a diagram for explaining a conventional tundish sealing method.
１ 取鍋 ２ 溶鋼 ３ タンディッシュ ４ タンディッシュ側壁のポーラスプラグ ５ Ａｒガス ５―１ 溶鋼表面より下部から溶鋼中に吹き込んだＡｒ
ガス ５―２ 溶鋼表面より上部から雰囲気中に吹き込んだＡ
ｒガス ６ ロングノズル ７ 溶鋼表面 ８ ノズル ９ 酸素 １０ 耐火ボード蓋1 Ladle 2 Molten steel 3 Tundish 4 Tundish Porous plug on the side wall 5 Ar gas 5-1 Ar Ar blown into molten steel from below the molten steel surface
Gas 5-2 A blown into the atmosphere from above the molten steel surface
r Gas 6 Long nozzle 7 Molten steel surface 8 Nozzle 9 Oxygen 10 Fireproof board lid
Claims (1)
る際、注入点のタンディッシュ側壁から不活性ガスを吹
き込むことを特徴とするタンディッシュ内溶鋼の清浄化
方法。1. A method for cleaning molten steel in a tundish, comprising injecting an inert gas from a side wall of a tundish at an injection point when pouring molten steel into a tundish from a ladle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20302094A JP3348988B2 (en) | 1994-08-05 | 1994-08-05 | Cleaning method for molten steel in tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20302094A JP3348988B2 (en) | 1994-08-05 | 1994-08-05 | Cleaning method for molten steel in tundish |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0847752A true JPH0847752A (en) | 1996-02-20 |
| JP3348988B2 JP3348988B2 (en) | 2002-11-20 |
Family
ID=16467023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20302094A Expired - Fee Related JP3348988B2 (en) | 1994-08-05 | 1994-08-05 | Cleaning method for molten steel in tundish |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3348988B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100488876B1 (en) * | 2002-11-20 | 2005-05-11 | 현대자동차주식회사 | Device for preventing intrusion of hydrogen gas |
| WO2007114100A1 (en) * | 2006-03-30 | 2007-10-11 | Kabushiki Kaisha Kobe Seiko Sho | Process for producing steel for high-carbon steel wire material with excellent drawability and fatigue characteristics |
-
1994
- 1994-08-05 JP JP20302094A patent/JP3348988B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100488876B1 (en) * | 2002-11-20 | 2005-05-11 | 현대자동차주식회사 | Device for preventing intrusion of hydrogen gas |
| WO2007114100A1 (en) * | 2006-03-30 | 2007-10-11 | Kabushiki Kaisha Kobe Seiko Sho | Process for producing steel for high-carbon steel wire material with excellent drawability and fatigue characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3348988B2 (en) | 2002-11-20 |
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