JP2888312B2 - Continuous casting method of steel slab by static magnetic field - Google Patents
Continuous casting method of steel slab by static magnetic fieldInfo
- Publication number
- JP2888312B2 JP2888312B2 JP24607991A JP24607991A JP2888312B2 JP 2888312 B2 JP2888312 B2 JP 2888312B2 JP 24607991 A JP24607991 A JP 24607991A JP 24607991 A JP24607991 A JP 24607991A JP 2888312 B2 JP2888312 B2 JP 2888312B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- continuous casting
- static magnetic
- nozzle
- molten steel
- 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.)
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- Continuous Casting (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、連続鋳造によって得
られた鋼スラブの表面および内部品質のより一層の改善
を図ることができる静磁場による鋼スラブの連続鋳造法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously casting steel slabs by a static magnetic field, which can further improve the surface and internal quality of steel slabs obtained by continuous casting.
【0002】[0002]
【従来の技術】幅広の鋼板の製造に用いられるスラブの
如き鋼片の連続鋳造においては、溶鋼を収容したタンデ
ィッシュと連鋳鋳型との間の溶鋼流路として、通常耐火
物製の浸漬ノズルが用いられている。この浸漬ノズル
は、とくにアルミキルド鋼の連続鋳造時にノズル内面に
アルミナが付着し易いため、鋳造時間の経過に伴い溶鋼
流路が狭められ、所望の溶鋼流量を得ることができない
問題があった。2. Description of the Related Art In the continuous casting of steel slabs such as slabs used for producing wide steel sheets, a refractory immersion nozzle, usually made of refractory, is used as a molten steel flow path between a tundish containing molten steel and a continuous casting mold. Is used. In this immersion nozzle, alumina tends to adhere to the inner surface of the nozzle particularly during continuous casting of aluminum-killed steel, so that the flow path of the molten steel is narrowed as the casting time elapses, and there has been a problem that a desired flow rate of the molten steel cannot be obtained.
【0003】このため通常は溶鋼を供給する間中、ノズ
ル内にArなどの不活性ガスを供給してこれに対処してい
たが、不活性ガスの供給速度が大きい場合には、該ガス
が鋳型内の浴上に浮上できずに図1(a)、(b)中で
示す凝固シェルaにトラップされるため、最終製品で欠
陥となることがあり、また不活性ガスを単に吹き込むだ
けでは、ノズル詰まりの回避効果は充分でなく、ノズル
交換の頻繁な取替え作業を必要とし、とくに、図5
(a)、(b)に示すように浸漬ノズル5の先端部に左
右対称吐出口6を備えた2孔ノズル形式の浸漬ノズル5
においては、吐出口の左右の非対称な閉塞により品質低
下を招く問題があった。For this reason, an inert gas such as Ar is usually supplied into the nozzle during the supply of molten steel to cope with this. However, when the supply rate of the inert gas is high, the gas is not supplied. Since it cannot be floated on the bath in the mold and is trapped in the solidified shell a shown in FIGS. 1A and 1B, the final product may be defective. However, the effect of avoiding nozzle clogging is not sufficient, and frequent replacement work of nozzle replacement is required.
(A) and (b), a two-hole nozzle type immersion nozzle 5 having a symmetrical discharge port 6 at the tip of the immersion nozzle 5
, There is a problem that the quality is deteriorated due to asymmetric left and right closing of the discharge port.
【0004】このような問題を解決する試みとしては、
アルミナと低融点の化合物を作るCaO を含有するノズル
を用いる試みもあるが、充分な効果は得られていない。
この他に特開昭60-92064号公報には、ノズル内の溶融金
属流に直流磁界を作用させて溶融金属流を層流化するこ
とにより、ノズル閉塞を抑制する溶融金属の注入方法が
開示されているが、溶融金属流が鋳型内の溶融金属クレ
ータの奥深くまで流下するので、随伴する介在物が浮上
できず凝固シェルにトラップされるおそれがある。Attempts to solve such problems include:
Attempts have been made to use a nozzle containing alumina and CaO, which produces a compound with a low melting point, but no satisfactory effect has been obtained.
In addition, Japanese Patent Application Laid-Open No. 60-92064 discloses a method for injecting molten metal that suppresses nozzle blockage by applying a DC magnetic field to the molten metal flow in the nozzle to make the molten metal flow laminar. However, since the molten metal flows down deep into the molten metal crater in the mold, the accompanying inclusions cannot float and may be trapped in the solidified shell.
【0005】[0005]
【発明が解決しようとする課題】連続鋳造における上述
したような問題を解消し表面および内部品質の良好な鋼
スラブを得ることができる静磁場による鋼スラブの連続
鋳造法を提案することがこの発明の目的である。SUMMARY OF THE INVENTION It is an object of the present invention to propose a continuous casting method of a steel slab by a static magnetic field which can solve the above-mentioned problems in the continuous casting and can obtain a steel slab having good surface and internal quality. Is the purpose.
【0006】[0006]
【課題を解決するための手段】炭素濃度が500ppm以下に
なる、主にAlで脱酸した低炭素アルミキルド鋼を用いて
連続鋳造の際におけるノズル詰まりについて種々調査、
検討を重ねた結果、溶鋼中の酸素濃度を 30ppm以下、よ
り好ましくは 20ppm以下に調整し、浸漬ノズルのノズル
本体の先端を開放して溶鋼の吐出口としたストレートノ
ズルを用いるとノズル詰まりがほとんどないことが明ら
かとなった。また、このようなストレートノズルにおい
ては、溶鋼の吐出流が鋳型の出側(下方)に向かうた
め、溶鋼中の介在物やガス気泡などがクレータの奥深く
まで侵入するおそれがある。Various investigations have been made on nozzle clogging during continuous casting using low carbon aluminum killed steel mainly deoxidized with Al, which has a carbon concentration of 500 ppm or less.
As a result of repeated studies, it was found that adjusting the oxygen concentration in the molten steel to 30 ppm or less, more preferably 20 ppm or less, and using a straight nozzle that opened the tip of the nozzle body of the immersion nozzle and used it as the discharge port of the molten steel almost caused nozzle clogging. It became clear that there was none. Further, in such a straight nozzle, since the discharge flow of the molten steel goes toward the outlet side (downward) of the mold, inclusions and gas bubbles in the molten steel may penetrate deep into the crater.
【0007】このような介在物等の侵入防止のためには
連鋳鋳型に、静磁場を作用させる静磁場発生装置を配置
して、上記ストレート浸漬ノズルからの吐出溶鋼流を制
動し、その結果生じるメニスカス方向への溶鋼流に対し
ても制動を加えることが鋳片内の品質向上に有効である
知見を得た。この発明は上記知見に基いてなされたもの
であり、その要旨とするところは下記の通りである。In order to prevent such inclusions from entering, a static magnetic field generator for applying a static magnetic field is arranged in the continuous casting mold to brake the flow of molten steel discharged from the straight immersion nozzle. It has been found that it is effective to apply braking to the generated molten steel flow in the meniscus direction to improve the quality in the slab. The present invention has been made based on the above findings, and the gist thereof is as follows.
【0008】すなわち、この発明は、タンディッシュに
収容した溶鋼を、一対の短辺鋳型と一対の長辺鋳型の組
合せからなる連鋳鋳型内に該タンディッシュとつながる
ノズル本体の先端を開放したストレート浸漬ノズルを通
して供給しつつ鋼スラブを連続鋳造するに当り、上記連
鋳鋳型内にメニスカス部全幅と上記浸漬ノズルの吐出部
を含む幅中央部に静磁場が発生するようなT字型の静磁
場発生器を長辺鋳型の背面に配置し、上記ストレート浸
漬ノズルからの溶鋼を上記幅中央部の静磁場内に吐出
し、この吐出流に上記T字型の静磁場発生器により制動
を加えると同時に、その制動により生じるメニスカス方
向への流動に制動を加えることを特徴とする静磁場によ
る鋼スラブの連続鋳造法であり、この発明においては、
溶鋼の注入過程で溶鋼酸素濃度が 20ppm以下と特に低い
場合にはストレート浸漬ノズル内に不活性ガスを吹き込
まないようにする。That is, according to the present invention, a molten steel accommodated in a tundish is placed in a continuous casting mold comprising a combination of a pair of short-side molds and a pair of long-side molds. In continuously casting a steel slab while feeding through an immersion nozzle, a T-shaped static magnetic field such that a static magnetic field is generated in the continuous casting mold at the entire width of the meniscus portion and the center of the width including the discharge portion of the immersion nozzle. The generator is arranged on the back side of the long side mold, and the molten steel from the straight immersion nozzle is discharged into the static magnetic field in the center of the width, and the discharge flow is braked by the T-shaped static magnetic field generator. At the same time, a continuous casting method of a steel slab by a static magnetic field characterized by applying a braking to the flow in the meniscus direction generated by the braking, in the present invention,
If the oxygen concentration of molten steel is particularly low at 20 ppm or less in the process of pouring molten steel, do not blow inert gas into the straight immersion nozzle.
【0009】さて、図1(a)、(b)にこの発明の実
施に用いて好適な連続鋳造装置の要部の構成を示し、図
における番号1は、一対の短辺壁1aと長辺壁1bから
なる連鋳鋳型、2はタンディッシュと繋がるストレート
浸漬ノズルであって、このストレート浸漬ノズル2はノ
ズル本体の先端部を開放して溶鋼のストレート吐出口4
とした構造になっている。FIGS. 1 (a) and 1 (b) show the structure of a main part of a continuous casting apparatus suitable for use in the present invention. In FIG. 1, reference numeral 1 denotes a pair of a short side wall 1a and a long side. A continuous casting mold 2 composed of a wall 1b is a straight immersion nozzle 2 connected to the tundish. The straight immersion nozzle 2 opens the tip of the nozzle body and opens a straight discharge port 4 of molten steel.
It has a structure.
【0010】また、3は連鋳鋳型1の長辺壁1bの背面
に配置され上記ストレート浸漬ノズルからの吐出溶鋼流
に制動を加え、その結果生じるメニスカス方向への流動
に同時に制動を加えるT字型の静磁場発生器である。A T-shaped member 3 is disposed on the back side of the long side wall 1b of the continuous casting mold 1 to apply braking to the molten steel flow discharged from the straight immersion nozzle and simultaneously apply braking to the resulting flow in the meniscus direction. Type static magnetic field generator.
【0011】[0011]
【作用】溶鋼の吐出口が左右対称になる図5(a)、
(b)に示すような2孔式浸漬ノズル5は、ノズルから
噴出させた溶鋼流がクレータの奥深くまで流入して注入
溶鋼中の介在物や気泡が凝固シェルにトラップされない
ように、また噴出流が鋳型内の浴面へ向かってモールド
パウダーの巻き込みを起こさないような構造がとられて
いる。さらにこのような構造にすることにより、吐出口
6からの溶鋼噴流が凝固シェルに直接接触することを防
止して、凝固が均一に安定して進行することを可能にし
ている。しかし、このような構造になる浸漬ノズルは、
とくに吐出口6近傍においてアルミナなどが付着し易
く、ノズル詰まりを起こし易いことは前述した。[Function] FIG. 5 (a), where the discharge port of molten steel is symmetrical.
The two-hole immersion nozzle 5 as shown in (b) prevents the molten steel flow ejected from the nozzle from flowing deep into the crater, so that inclusions and bubbles in the injected molten steel are not trapped in the solidified shell. Is designed so that the mold powder is not entrained toward the bath surface in the mold. Further, by adopting such a structure, the molten steel jet from the discharge port 6 is prevented from directly contacting the solidified shell, and solidification can proceed uniformly and stably. However, the immersion nozzle having such a structure
In particular, as described above, alumina and the like tend to adhere to the vicinity of the discharge port 6 and clog the nozzle.
【0012】この発明においては、浸漬ノズルをノズル
本体の先端が開放されたストレート吐出口4を有する構
造になる図2(a)、(b)に示すようなストレート浸
漬ノズル2を用い、このノズルより図1(a)、(b)
に示すように連鋳鋳型1内へ供給する溶鋼に対して、連
鋳鋳型1に配置したT字型の静磁場発生器3の磁極領域
で制動を加えつつ連続鋳造するようにしたから、アルミ
ナの付着に起因したノズル詰まりを起こすような不具合
はなく、従って所望の速度で溶鋼を鋳型内に注入しても
介在物が溶鋼の奥深くまで侵入したり、鋳型内に上向き
の流れが生じてもメニスカス溶鋼上のモールドパウダー
を巻き込むことはない。In the present invention, a straight immersion nozzle 2 as shown in FIGS. 2 (a) and 2 (b) having a straight discharge port 4 having an open end at the tip of the nozzle body is used as the immersion nozzle. Fig. 1 (a), (b)
Since the molten steel supplied into the continuous casting mold 1 is braked in the magnetic pole region of the T-shaped static magnetic field generator 3 arranged in the continuous casting mold 1 as shown in FIG. There is no problem such as nozzle clogging caused by the adhesion of the molten steel.Therefore, even if molten steel is injected into the mold at a desired speed, inclusions may penetrate deep into the molten steel or an upward flow may occur in the mold. There is no entrainment of mold powder on the meniscus molten steel.
【0013】[0013]
【実施例】以下、この発明の実施例について説明する。 実施例−1 2ストランド連鋳機を適用して取鍋精錬を経たC濃度 3
60〜450ppm、Al濃度 450〜620ppm、酸素濃度27〜30ppm
になる溶鋼を下記の条件で3チャージ( 280t/チャー
ジ)分を継続して連続鋳造し、ストレート浸漬ノズル内
のアルミナの付着状況を調査した。Embodiments of the present invention will be described below. Example 1 C concentration after ladle refining using a two-strand continuous caster 3
60-450ppm, Al concentration 450-620ppm, Oxygen concentration 27-30ppm
Was continuously cast for 3 charges (280 t / charge) under the following conditions, and the adhesion of alumina in the straight immersion nozzle was investigated.
【0014】なお、この発明に従う連続鋳造を行うにあ
たっては、T字型静磁場発生器3を図3に示すような寸
法関係で配置した。そして2ストランドのうち、一方の
ストランドでは従来の2孔型の浸漬ノズルを用い、もう
一方のストランドではこの発明ではストレート浸漬ノズ
ルを用い、ストレート浸漬ノズルを用いたストランドの
みに上記T字型の静磁場発生器による静磁界を適用し
た。In performing the continuous casting according to the present invention, the T-shaped static magnetic field generator 3 was arranged in a dimensional relationship as shown in FIG. Of the two strands, a conventional two-hole immersion nozzle is used for one strand, and a straight immersion nozzle is used in the present invention for the other strand, and the T-shaped static nozzle is used only for the strand using the straight immersion nozzle. A static magnetic field by a magnetic field generator was applied.
【0015】鋳造条件は以下の通りである。 鋳型サイズ;短辺 220mm 、長辺 1600mm 鋳造速度; 1.7m/min タンディッシュ内溶鋼過熱度;25〜30℃ 静磁場発生器の最大磁束;3000ガウス その結果、ノズル内に10Nl/min のノズル詰まり防止用
ガスを吹き込んだ従来の2孔型の浸漬ノズルを用いた連
続鋳造においては、ノズル吐出口近傍に最大で10mm厚み
になるアルミナ付着物の層が認められたが、この発明に
従う連続鋳造においては、Arガスをノズル内に吹込まな
かったにもかかわらずアルミナの付着物層は最大で2mm
程度であって、ノズル詰まりが極めて小さいことが確か
められた。The casting conditions are as follows. Mold size; short side 220mm, long side 1600mm Casting speed; 1.7m / min Superheat degree of molten steel in tundish; 25-30 ° C Maximum magnetic flux of static magnetic field generator; 3000 gauss As a result, nozzle clogging of 10Nl / min in nozzle In continuous casting using a conventional two-hole immersion nozzle into which a gas for prevention was blown, a layer of alumina deposits with a maximum thickness of 10 mm was observed near the nozzle discharge port, but in the continuous casting according to the present invention, Indicates that the alumina deposit layer is 2 mm at maximum even though Ar gas was not injected into the nozzle.
It was confirmed that nozzle clogging was extremely small.
【0016】実施例−2 取鍋内の溶鋼(実施例−1と同一組成)浴面上のスラグ
にAl粉末を添加して取鍋内溶鋼浴面上のスラグ中の FeO
を還元して、 FeO濃度を3%以下とした取鍋精錬を行っ
て溶鋼中の酸素濃度を15〜18ppm としたのち、実施例−
1と同様の鋳造条件のもとに、3チャージ( 280t/チ
ャージ)連続的に連続鋳造を行い、その際の浸漬ノズル
のアルミナの付着状況を調査した。なお、この実施例で
は、両ストランド共に浸漬ノズル内には一切ノズル詰ま
り防止用のガスは吹き込まなかった。Example 2 Molten steel in the ladle (same composition as in Example 1) Al powder was added to the slag on the bath surface to add FeO in the slag on the molten steel bath surface in the ladle.
After reducing the iron content and performing ladle refining to reduce the FeO concentration to 3% or less to bring the oxygen concentration in the molten steel to 15 to 18 ppm,
Under the same casting conditions as in 1, continuous casting was carried out continuously for 3 charges (280 t / charge), and the adhesion of alumina to the immersion nozzle at that time was investigated. In this example, no gas for preventing nozzle clogging was blown into the immersion nozzle in both strands.
【0017】その結果、2孔浸漬ノズルを用いる従来法
に従った場合には、3チャージ目においてノズル詰まり
のために所定の注入速度が達成できず、鋳造速度が1.7
m/min から1.2 m/min に低下したが、この発明に従
う連続鋳造においては、鋳造速度が低下するようなこと
はなく、鋳造終了後にストレート浸漬ノズルを回収して
その内面を観察したところ、1〜2mm程度のアルミナが
付着しているのみであった。As a result, when the conventional method using a two-hole immersion nozzle is followed, a predetermined injection speed cannot be achieved due to nozzle clogging at the third charge, and the casting speed is reduced to 1.7.
m / min to 1.2 m / min, but in the continuous casting according to the present invention, the casting speed did not decrease. After the completion of casting, the straight immersion nozzle was recovered and its inner surface was observed. Only alumina of about 2 mm was attached.
【0018】なおストレート浸漬ノズルを用い、静磁界
を適用しない実験を別途行ったが、この条件では、ノズ
ル先端から吐出する温度の高い溶鋼噴流が強い流れとな
って鉛直下方に流れて凝固シェルを洗うために、その部
分の凝固進行が妨げられる。そのため、いわゆるブレー
クアウトが発生し、鋳造が不可能であった。これに対し
て、この発明の実施例−1、2では静磁界の適用によっ
てすでに述べたように安定した鋳造が可能であった。Although an experiment was conducted separately using a straight immersion nozzle and applying no static magnetic field, under these conditions, a high-temperature molten steel jet discharged from the nozzle tip flows vertically downward to form a solidified shell. The washing hinders the solidification progress of that part. Therefore, a so-called breakout occurred, and casting was impossible. On the other hand, in Examples 1 and 2 of the present invention, stable casting was possible by applying a static magnetic field as described above.
【0019】以上の実施例−1にて得られた連鋳スラブ
を、次に熱間圧延、冷間圧延して厚さ0.7mm の冷延板と
し、得られた鋼板の表面欠陥(ふくれ性欠陥とすじ状欠
陥の合計)の発生率について調査した。その結果を図4
に示す。図4において、この発明に従う連続鋳造を行っ
た場合には、表面欠陥の発生率が非常に小さいことがわ
かる。この理由は、連続鋳造用鋳型における静磁界の適
用によって、溶鋼の注入流がクレータの奥深くまで侵入
することがないことと、メニスカスの溶鋼流動が抑制さ
れモールドパウダーの巻きこみがないためと考えられ
る。また実施例−2における適合例の結果が実施例−1
の適合例よりも良好なのは、溶鋼の酸素濃度が低く。ま
たふくれ性欠陥の主因となるArガスの吹き込みを行って
いないためと考えられる。なお、この実施例−2におけ
る比較例でもかなり良い結果が得られているが、ノズル
内にノズル詰まり防止用のガスを吹き込まないために、
ノズル詰まりが発生して所望の鋳造速度が得られず、生
産性の点で問題がある。The continuously cast slab obtained in the above Example-1 was then hot-rolled and cold-rolled to form a cold-rolled sheet having a thickness of 0.7 mm. (The sum of defects and streak defects) was investigated. The result is shown in FIG.
Shown in FIG. 4 shows that the rate of occurrence of surface defects is very low when continuous casting is performed according to the present invention. It is considered that the reason for this is that the application of the static magnetic field in the continuous casting mold does not allow the injection flow of the molten steel to penetrate deep into the crater, and that the flow of the molten steel of the meniscus is suppressed and the mold powder is not wound. Also, the result of the conforming example in the embodiment-2 is the same as that of the embodiment-1
What is better than the conforming example is the low oxygen concentration of the molten steel. It is also considered that Ar gas, which is the main cause of blistering defects, was not blown. Although a comparatively good result is obtained in the comparative example in Example-2, since a gas for preventing nozzle clogging is not blown into the nozzle,
A desired casting speed cannot be obtained due to nozzle clogging, and there is a problem in productivity.
【0020】以上のことからこの発明法により表面欠陥
の極めて少ない冷延鋼板を得ることが可能であることが
確認された。From the above, it was confirmed that a cold-rolled steel sheet having extremely few surface defects can be obtained by the method of the present invention.
【0021】[0021]
【発明の効果】以上説明したようにこの発明によれば、
ストレート浸漬ノズルを用いるにもかかわらず、安定し
た連続鋳造が可能で、内部品質の良好な鋳片を得ること
ができる。特に溶鋼の酸素濃度が 20ppm以下と低い場合
には、ノズル詰まり防止用のArガスを吹き込む必要がな
く、Arガス気泡の凝固シェルの捕捉がないので、品質の
優れた鋳片が得られる。As described above, according to the present invention,
Despite the use of a straight immersion nozzle, stable continuous casting is possible, and a slab with good internal quality can be obtained. In particular, when the oxygen concentration of the molten steel is as low as 20 ppm or less, it is not necessary to blow Ar gas for preventing nozzle clogging, and there is no trapped solidified shell of Ar gas bubbles, so that a slab of excellent quality can be obtained.
【図1】この発明に係る連続鋳造装置の構成を示す断面
図である。FIG. 1 is a sectional view showing a configuration of a continuous casting apparatus according to the present invention.
【図2】この発明に従う鋳造方法に適用して好適なスト
レート浸漬ノズルを示す断面図である。FIG. 2 is a sectional view showing a straight immersion nozzle suitable for being applied to a casting method according to the present invention.
【図3】この発明の実施例に係る連続鋳造装置の配置を
寸法と共に示す断面図である。FIG. 3 is a sectional view showing an arrangement of a continuous casting apparatus according to an embodiment of the present invention together with dimensions.
【図4】実施例の結果を表面欠陥発生率(指数)につい
て比較した棒グラフである。FIG. 4 is a bar graph comparing the results of Examples with respect to the incidence (index) of surface defects.
【図5】従来の左右対称吐出口浸漬ノズルを示す断面図
である。FIG. 5 is a cross-sectional view showing a conventional symmetric discharge port immersion nozzle.
1 連鋳鋳型 1a 短辺壁 1b 長辺壁 2 浸漬ノズル 3 静磁場発生器 4 ストレート吐出口 5 左右対称型2孔ノズル 6 左右対称型2孔ノズルの吐出口 DESCRIPTION OF SYMBOLS 1 Continuous casting mold 1a Short side wall 1b Long side wall 2 Immersion nozzle 3 Static magnetic field generator 4 Straight discharge port 5 Left-right symmetric 2-hole nozzle 6 Left-right symmetric 2-hole nozzle discharge port
───────────────────────────────────────────────────── フロントページの続き (72)発明者 奈良 正功 千葉県千葉市川崎町1番地 川崎製鉄株 式会社 技術研究本部内 (56)参考文献 特開 平5−77007(JP,A) 特開 平4−361858(JP,A) 特開 昭58−55157(JP,A) 特開 平4−197553(JP,A) 特開 昭63−154246(JP,A) 特開 昭62−130752(JP,A) 特開 平2−284750(JP,A) 特開 平5−77006(JP,A) (58)調査した分野(Int.Cl.6,DB名) B22D 11/10 350 B22D 11/10 330 B22D 27/02 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masanori Nara 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Corporation Technology Research Division (56) References JP-A-5-77007 (JP, A) JP JP-A-4-361858 (JP, A) JP-A-58-55157 (JP, A) JP-A-4-197553 (JP, A) JP-A-63-154246 (JP, A) JP-A-62-130752 (JP) JP-A-2-284750 (JP, A) JP-A-5-77006 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B22D 11/10 350 B22D 11/10 330 B22D 27/02
Claims (2)
の短辺鋳型と一対の長辺鋳型の組合せからなる連鋳鋳型
内に該タンディッシュとつながるノズル本体の先端を開
放したストレート浸漬ノズルを通して供給しつつ鋼スラ
ブを連続鋳造するに当り、上記連鋳鋳型内にメニスカス
部全幅と上記浸漬ノズルの吐出部を含む幅中央部に静磁
場が発生するようなT字型の静磁場発生器を長辺鋳型の
背面に配置し、上記ストレート浸漬ノズルからの溶鋼を
上記幅中央部の静磁場内に吐出し、この吐出流に上記T
字型の静磁場発生器により制動を加えると同時に、その
制動により生じるメニスカス方向への流動に制動を加え
ることを特徴とする静磁場による鋼スラブの連続鋳造
法。1. A molten steel contained in a tundish is supplied through a straight immersion nozzle having a tip end of a nozzle body connected to the tundish into a continuous casting mold comprising a combination of a pair of short-side molds and a pair of long-side molds. In the continuous casting of steel slabs, a T-shaped static magnetic field generator which generates a static magnetic field in the entire width of the meniscus portion and the center of the width including the discharge portion of the immersion nozzle in the continuous casting mold is lengthened. The molten steel from the straight immersion nozzle is discharged into the static magnetic field at the center of the width, and the T flow is applied to the discharge flow.
A continuous casting method of a steel slab by a static magnetic field, wherein braking is applied to a flow in a meniscus direction caused by the braking at the same time as braking is applied by a V-shaped static magnetic field generator.
トレート浸漬ノズル内に不活性ガスを吹き込まない請求
項1記載の静磁場による鋼スラブの連続鋳造法。2. The continuous casting method of a steel slab by a static magnetic field according to claim 1, wherein inert gas is not blown into the straight immersion nozzle using molten steel having an oxygen concentration of 20 ppm or less.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24607991A JP2888312B2 (en) | 1991-09-25 | 1991-09-25 | Continuous casting method of steel slab by static magnetic field |
CA002096737A CA2096737C (en) | 1991-09-25 | 1992-09-25 | Process of continuously casting steel slab using electromagnetic field |
KR1019930701482A KR0184240B1 (en) | 1991-09-25 | 1992-09-25 | Process of continuously casting steel using electromagnetic field |
US08/064,084 US5570736A (en) | 1991-09-25 | 1992-09-25 | Process of continuously casting steel using electromagnetic field |
PCT/JP1992/001221 WO1993005907A1 (en) | 1991-09-25 | 1992-09-25 | Method of continuously casting steel slabs by use of electromagnetic field |
DE69230666T DE69230666T2 (en) | 1991-09-25 | 1992-09-25 | METHOD FOR CONTINUOUSLY STEEL USING MAGNETIC FIELDS |
EP92919861A EP0568699B1 (en) | 1991-09-25 | 1992-09-25 | Method of continuously casting steel slabs by use of electromagnetic field |
TW081107813A TW213954B (en) | 1991-09-11 | 1992-10-01 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24607991A JP2888312B2 (en) | 1991-09-25 | 1991-09-25 | Continuous casting method of steel slab by static magnetic field |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0577009A JPH0577009A (en) | 1993-03-30 |
JP2888312B2 true JP2888312B2 (en) | 1999-05-10 |
Family
ID=17143170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24607991A Expired - Fee Related JP2888312B2 (en) | 1991-09-11 | 1991-09-25 | Continuous casting method of steel slab by static magnetic field |
Country Status (1)
Country | Link |
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JP (1) | JP2888312B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018198181A1 (en) * | 2017-04-25 | 2018-11-01 | Jfeスチール株式会社 | Continuous casting method for steel |
-
1991
- 1991-09-25 JP JP24607991A patent/JP2888312B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JPH0577009A (en) | 1993-03-30 |
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