JP2008188644A - Continuous casting method for steel, equipment, and method for producing surface treated steel sheet - Google Patents
Continuous casting method for steel, equipment, and method for producing surface treated steel sheet Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000009749 continuous casting Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title claims description 10
- 238000007654 immersion Methods 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 14
- 239000000843 powder Substances 0.000 abstract description 8
- 230000005499 meniscus Effects 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 6
- 238000007598 dipping method Methods 0.000 abstract 2
- 238000005243 fluidization Methods 0.000 abstract 2
- 238000011437 continuous method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 230000004907 flux Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
Description
本発明は、鋼の連続鋳造方法、設備、及び表面処理鋼板の製造方法に係り、特に、高速鋳造により、自動車用冷延鋼板、溶融亜鉛めっき鋼板を含む表面処理鋼板等の、表面品質が厳格な仕様で欠陥が出易い薄鋼板を製造する際に用いるのに好適な、磁界印加による鋳型内溶鋼流動の改善に関する。 The present invention relates to a steel continuous casting method, equipment, and a method for producing a surface-treated steel sheet, and in particular, surface quality such as a cold-rolled steel sheet for automobiles and a surface-treated steel sheet including hot-dip galvanized steel sheet is strict by high-speed casting. The present invention relates to improvement of molten steel flow in a mold by application of a magnetic field, which is suitable for use in manufacturing a thin steel sheet that is prone to defects with various specifications.
近年、自動車用鋼板を中心として、鋼製品の品質向上要求が厳しくなり、スラブ段階から清浄度の優れた高品質のスラブの要求が高まっている。スラブの欠陥には、介在物や気泡に起因するものや、溶鋼中の成分の偏析に起因するものがあり、溶鋼内の流動は、これらと深い関係があるため、多くの研究、発明がなされてきた。その1つとして、磁界を用いた鋳型内溶鋼流動制御方法がある。 In recent years, mainly for steel sheets for automobiles, the demand for quality improvement of steel products has become strict, and the demand for high-quality slabs with excellent cleanliness has increased from the slab stage. Slab defects include those caused by inclusions and bubbles, and those caused by segregation of components in the molten steel, and the flow in the molten steel is closely related to these, so many studies and inventions have been made. I came. One of them is a molten steel flow control method in a mold using a magnetic field.
例えば特許文献1(図1)には、図1に示す如く、鋳型10内の溶鋼8のメニスカス近傍に交流(AC)の移動磁界発生装置20を配置し、移動磁場により鋳型10内の溶鋼8の表面に旋回流Aを発生させ、鋳型壁面への介在物、気泡の付着を旋回流Aの掻き出し効果で抑制することが記載されている。図において、10aは鋳型10の長辺、10bは同じく短辺、12は浸漬ノズル、12aは、その吐出孔、14は鋳片である。
For example, in Patent Document 1 (FIG. 1), as shown in FIG. 1, an alternating current (AC) moving
しかしながら、図1の従来技術では、渦流Bが発生して、溶鋼表面のモールドパウダを巻き込み、鋳片14の内部欠陥を誘発するという問題点がある。
However, the prior art of FIG. 1 has a problem in that the vortex B is generated to entrain the mold powder on the surface of the molten steel and induce an internal defect of the
このような問題点を解決するべく、同じ特許文献1(図2)には、図2に示す如く、鋳型上部の前記移動磁界発生装置20に加えて、更に、浸漬ノズル12の吐出孔12aの下に直流(DC)の静磁界発生装置30を配置し、静磁場を発生させることにより、鋳型10内の下方に流入する溶鋼8の流動を抑制することが記載されている。
In order to solve such a problem, the same patent document 1 (FIG. 2) includes, as shown in FIG. 2, in addition to the moving magnetic
これによりモールドパウダや介在物等の溶鋼内部への巻き込みを抑制し、溶鋼内部欠陥の発生を抑制することができる。 Thereby, it is possible to suppress the entrainment of mold powder, inclusions and the like inside the molten steel, and to suppress the occurrence of internal defects in the molten steel.
しかしながら、溶鋼8の表面を流れる旋回流Aと、浸漬ノズル12の吐出孔12aから吐出した溶鋼8の上昇流Cとが鋳型上面で干渉し、モールドパウダの巻き込みを誘発し、鋳片14の欠陥が発生するという問題点を有し、これを避けるためには溶鋼スループット量を下げて生産量を落とす必要があった。
However, the swirl flow A flowing on the surface of the
一方、本発明に類似するものとして、特許文献2には、上部に設けた交流用の磁界発生装置に直流も流して、移動磁界に静磁界を重畳することが記載されている。 On the other hand, as similar to the present invention, Patent Document 2 describes that a direct magnetic field is also passed through an alternating-current magnetic field generator provided at an upper portion so that a static magnetic field is superimposed on a moving magnetic field.
しかしながら、特許文献2の従来技術は、交流用のコイルに直流を重畳するものであったため、鋳型長手方向に均一な直流磁界を発生することができないという問題点を有していた。 However, the prior art of Patent Document 2 has a problem in that since a direct current is superimposed on an alternating current coil, a uniform direct current magnetic field cannot be generated in the longitudinal direction of the mold.
なお特許文献3では、交流磁界発生装置と直流磁界発生装置のコイルを独立して設けているが、交流磁界と直流磁界の鉄芯部が共通なため、上記と同じ問題を引き起こす。更に、コイルの位置が浸漬ノズルの吐出孔にかかっており、十分な効果をあげることができなかった。 In Patent Document 3, the coils of the AC magnetic field generator and the DC magnetic field generator are provided independently. However, since the iron core portions of the AC magnetic field and the DC magnetic field are common, the same problem as described above is caused. Furthermore, the position of the coil depends on the discharge hole of the immersion nozzle, and a sufficient effect cannot be obtained.
本発明は、前記従来の問題点を解消するべくなされたもので、鋳造速度を下げることなく、メニスカス近傍に付着する介在物や気泡を効果的に除去すると同時に、モールドパウダの巻き込みを低減し、更に気泡浮上を促進させて、品質を向上することを課題とする。 The present invention was made to solve the above-described conventional problems, and effectively removes inclusions and bubbles adhering to the vicinity of the meniscus without reducing the casting speed, while reducing the entrainment of the mold powder, Furthermore, it is an object to improve the quality by promoting bubble floating.
本発明は、連続鋳造用鋳型の長辺背面に配置した、鋳型長辺を挟み対向する磁極にて磁界を印加して、浸漬ノズルにより流入される鋳型内溶鋼の流動を制御する鋼の連続鋳造方法において、互いに独立した交流磁界用磁極と直流磁界用磁極を用いて、鋳型長辺の全幅にわたって、浸漬ノズルの吐出孔より上側の溶鋼のみに、交流磁界と直流磁界を重ねて印加するようにして、前記課題を解決したものである。 The present invention is a continuous casting of steel that controls the flow of molten steel in a mold that is flowed by an immersion nozzle by applying a magnetic field at a magnetic pole that is opposed to the long side of the mold and is arranged on the back side of the long side of the continuous casting mold. In the method, the AC magnetic field and the DC magnetic field are applied to only the molten steel above the discharge hole of the immersion nozzle over the entire width of the long side of the mold by using the AC magnetic field magnetic pole and the DC magnetic field magnetic pole independent of each other. Thus, the above-mentioned problems have been solved.
前記交流磁界用磁極と直流磁界用磁極の鉄芯が独立していないと、その鉄芯の所に強い磁力をもち、幅方向に不均一になる。 If the iron cores of the AC magnetic field magnetic pole and the DC magnetic field magnetic pole are not independent, the iron core has a strong magnetic force and becomes uneven in the width direction.
前記溶鋼のスループット量は、4トン/分以上6.5トン/分以下とすることができる。 The throughput amount of the molten steel can be 4 tons / minute or more and 6.5 tons / minute or less.
更に、前記鋳片の厚みは180mm以上310mm以下、浸漬ノズルから吹き込むアルゴンガス量は2Nl/分以上30Nl/分以下とすることができる。 Furthermore, the thickness of the slab can be 180 mm or more and 310 mm or less, and the amount of argon gas blown from the immersion nozzle can be 2 Nl / min or more and 30 Nl / min or less.
本発明は又、前記の連続鋳造方法により製造した鋳片を用いて製造することを特徴とする表面処理鋼板の製造方法を提供するものである。 The present invention also provides a method for producing a surface-treated steel sheet, which is produced using a slab produced by the continuous casting method.
本発明は、又、連続鋳造用鋳型の長辺背面に配置した、鋳型長辺を挟み対向する磁極にて磁界を印加して、浸漬ノズルにより流入される鋳型内溶鋼の流動を制御するようにした鋼の連続鋳造設備において、浸漬ノズルの吐出孔より上側の鋳型長辺の全幅にわたって配設された、互いに独立した交流磁界用磁極と直流磁界用磁極とを備え、浸漬ノズルの吐出孔より上側のみに、交流磁界と直流磁界を重ねて印加するようにされていることを特徴とする鋼の連続鋳造設備を提供するものである。 The present invention also controls the flow of molten steel in the mold that is flowed by the immersion nozzle by applying a magnetic field at a magnetic pole facing the long side of the mold, which is disposed on the back side of the long side of the continuous casting mold. In the continuous casting equipment for steel, an AC magnetic field magnetic pole and a DC magnetic field magnetic pole, which are arranged over the entire width of the mold long side above the discharge hole of the immersion nozzle, are provided, and above the discharge hole of the immersion nozzle. The present invention provides a continuous casting equipment for steel, wherein an alternating magnetic field and a direct magnetic field are applied in an overlapping manner.
前記交流磁界用磁極のコイル数は、鋳型長辺の幅方向の長さ1600mmに対し、6個以上として、磁場を均一に近付けることができる。 The number of coils of the magnetic field for alternating current magnetic field can be made six or more with respect to the length of 1600 mm in the width direction of the long side of the mold so that the magnetic field can be made closer to the uniform.
又、前記直流磁界用磁極の鉄芯を、鋳型長辺の全幅にわたって共通として、幅方向に一体として存することが、磁力を均一とするために望ましい。 In order to make the magnetic force uniform, it is desirable that the iron core of the magnetic pole for DC magnetic field is made common over the entire width of the long side of the mold and integrated in the width direction.
本発明においては、図3に例示する如く、溶鋼8のメニスカス近傍に、交流(AC)磁界発生装置20と直流(DC)磁界発生装置30を重畳的に配置する。そして、交流の電磁撹拌により、溶鋼8に旋回流Aを発生させ、メニスカス近傍に付着する介在物や気泡を効果的に除去する。それと同時に、鋳型上部の溶鋼表面に発生する渦流を直流の磁場により制動し、モールドパウダの巻き込みを低減すると共に、気泡浮上を促進させる。
In the present invention, as illustrated in FIG. 3, an alternating current (AC)
なお、浸漬ノズル12の下部では磁界を発生しない。それは、浸漬ノズル12の吐出孔12aからの吐出流が鋳型上部の表面を流れる旋回流Aに影響を及ぼし、モールドパウダ巻き込みの原因となるためである。又、吐出流により運ばれる介在物等は溶鋼8の内部に保持されるので、薄鋼板、特に自動車用外板等の表面性状性の厳格さを要求する表面処理鋼板には、却って品質を良くする効果がある。これに対して、下部で磁界を発生すると、図2に示した上昇流Cにより、介在物等がメニスカスに付着する頻度が高まってしまう。
A magnetic field is not generated below the
本発明によれば、鋳造速度を下げることなく、メニスカス近傍に付着する介在物や気泡を効果的に除去すると同時に、モールドパウダの巻き込みを低減し、更に気泡浮上を促進させて、品質を向上することができる。 According to the present invention, inclusions and bubbles adhering to the vicinity of the meniscus are effectively removed without reducing the casting speed, and at the same time, the entrainment of the mold powder is reduced, and the bubble floating is further promoted to improve the quality. be able to.
従って、自動専用冷延鋼板、溶融亜鉛めっき鋼板を含む表面処理鋼板等の表面品質が厳格な仕様で欠陥が出易い表面処理鋼板(例えば厚さ1mm程度)用の鋳片を、高速(例えば溶鋼スループット量が4トン/分以上)で鋳造することが可能になる。 Therefore, cast slabs for surface-treated steel sheets (for example, about 1 mm thick) that have high surface quality, such as automatic-dedicated cold-rolled steel sheets and surface-treated steel sheets including hot-dip galvanized steel sheets, which are subject to strict specifications, are high speed (for example, molten steel It becomes possible to cast at a throughput amount of 4 tons / minute or more.
以下図面を参照して、本発明の実施形態を詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
本発明の実施に好適な、鋼の連続鋳造設備の特徴をなす交流磁界と直流磁界を重畳して印加する電磁石の一例を、鋳型の水平断面の模式図で図4に示す。図において、10が鋳型、12が浸漬ノズル、20が交流磁界発生装置、22が櫛歯状鉄芯、24が交流用電磁石のコイル、26a、26bが交流電源、28が交流用電磁石の磁極、30が直流磁界発生装置、32が直流電源、34が直流用電磁石の磁極、36が同じく直流用電磁石のコイルである。 FIG. 4 is a schematic diagram of a horizontal cross section of a mold and shows an example of an electromagnet that is applied to the AC magnetic field and the DC magnetic field superimposed on each other and suitable for the practice of the present invention. In the figure, 10 is a mold, 12 is an immersion nozzle, 20 is an AC magnetic field generator, 22 is a comb-like iron core, 24 is a coil of an AC electromagnet, 26a and 26b are AC power supplies, 28 is a magnetic pole of an AC electromagnet, 30 is a DC magnetic field generator, 32 is a DC power source, 34 is a magnetic pole of a DC electromagnet, and 36 is a coil of a DC electromagnet.
前記交流用電磁石は、鋳型10の長辺方向(図の左右方向)xに例えば12個配置され、各電磁石が発生する磁場を、例えば位相0°、60°、120°、180°、240°、300°、又は、0°、90°、180°、270°、0°、90°、180°と順次変化させることで、幅方向にマクロな流動を誘起させるようにしている。
For example, twelve AC electromagnets are arranged in the long side direction (left-right direction in the figure) x of the
ここで、互いに独立した交流磁界用磁極と直流磁界用磁極とは、図4に示すように交流磁界用磁極28と直流磁界用磁極34がそれぞれ巻線24、36の直下の鉄芯部分が異なる位置にあることをいう。これに対して、特許文献3に記載された、図5のような交流磁界用磁極と直流磁界用磁極で鉄芯40を共有する構成の場合は、鋳型長手方向に均一な直流磁界を発生させることができず、本発明の効果は得られない。
Here, the AC magnetic field magnetic pole and the DC magnetic field magnetic pole, which are independent of each other, are different from each other in the AC magnetic field
なお、交流電流の所定の周波数としては、1〜8Hzとするのが好ましく、より好ましくは3〜6Hzである。交流用コイル24に流す交流電流の周波数は、1Hz未満では、低すぎて十分な流動は誘起されない。一方、8Hzを超えると、交流磁界印加の効果が少なくなり、鋳造まわりの部材による磁場の極失が大きくなる。このため、交流用コイル24に流す交流電流の周波数を1〜8Hzとした。
The predetermined frequency of the alternating current is preferably 1 to 8 Hz, and more preferably 3 to 6 Hz. If the frequency of the alternating current flowing through the alternating
なお、本発明では、印加する交流磁界の磁束密度は1000ガウス未満とするのが好ましい。磁束密度が1000ガウス以上になると、湯面変動が大きくなり、モールドフラックスの巻き込みを助長するという問題がある。 In the present invention, the magnetic flux density of the alternating magnetic field to be applied is preferably less than 1000 gauss. When the magnetic flux density is 1000 gauss or more, there is a problem that fluctuation of the molten metal surface becomes large, and entrainment of mold flux is promoted.
なお、本実施形態においては、更に、直流磁界発生装置30を設置して、鋳型の厚さ方向(短辺方向)yの向きに直流磁界を印加するようにしている。
In the present embodiment, a DC
前記直流磁界発生装置30は、鋳型10の長辺方向xに鋳型10を挟んで一対の磁極を配置し、直流電源32から直流電流を直流用コイル34に流して、鋳型10の厚さ方向yに直流磁界を印加する。
The DC
次に、実施例に基づき、本発明について、更に詳細に説明する。 Next, based on an Example, this invention is demonstrated still in detail.
約300トンの溶鋼を転炉で溶製し、RH処理によって極低炭素鋼のAlキルド鋼とし、連続鋳造機でスラブを鋳造した。代表的な溶鋼成分を表1に示す。 About 300 tons of molten steel was melted in a converter and made into ultra-low carbon steel Al killed steel by RH treatment, and a slab was cast by a continuous casting machine. Table 1 shows typical molten steel components.
なお、スラブの幅は1500〜1700mm、厚みは220mm、溶鋼のスループット量は4〜5トン/分の範囲とした。 The width of the slab was 1500-1700 mm, the thickness was 220 mm, and the throughput of the molten steel was in the range of 4-5 tons / min.
又、交流用コイルの構造として、図4に示した如く、幅方向に12等分した櫛歯状の鉄芯22を用い、位相が異なる磁場を発生できるように配置した。交流磁界による磁束は最大2000ガウスとした。
Further, as shown in FIG. 4, a comb-shaped
比較例と本発明の実施例の実験結果を表2に示す。 Table 2 shows the experimental results of the comparative example and the example of the present invention.
表2で、「筋状欠陥指数」は、スラブを溶融亜鉛めっき鋼板に仕上げた後、コイルの外表面を目視で検査し、筋状欠陥発生状況を指数化したものであり、指数化はコイルの長手方向に延びた筋状欠陥の長さを計測し、その総和を検査したコイルの全長で割算することにより求め、最大指数を10として指数化したものである。「モールドフラックス性欠陥指数」は、スラブの表面をスカーフした後、外観を目視チェックし、その結果を指数化したもので、目視チェックは1m2当たりの欠陥個数を数え、最大指数を10として指数化したものである。「気泡、介在物欠陥指数」は、スラブの表面を2mmスカーフし、その位置での直径100μm以上の気泡個数を超音波探傷法にて測定し、1m2当たりの気泡個数とした後、最大指数を10として指数化したものである。 In Table 2, “Stripe Defect Index” is obtained by visualizing the outer surface of the coil after finishing the slab into a hot-dip galvanized steel sheet and indexing the occurrence of the streak defect. Is obtained by measuring the length of the streak defect extending in the longitudinal direction and dividing the sum by the total length of the inspected coil and indexing the maximum index as 10. "Mold flux defect index", after scarf the surface of the slab, the appearance was visually checked, in which the index of the result, the visual check counts the number of defects per 1 m 2, index the maximum exponent as 10 It has become. The “bubble and inclusion defect index” is obtained by scarfing the surface of the slab by 2 mm, measuring the number of bubbles with a diameter of 100 μm or more at the position by ultrasonic flaw detection, and setting the number of bubbles per 1 m 2 , then the maximum index. Is indexed as 10.
ここで、比較例1、2は、交流磁界のみを加えたもの、比較例3は、交流磁界に直流磁界を重畳すると共に、ノズル吐出孔より下部に直流磁界を加えたもの、比較例4は、ノズル吐出孔より上部に交流磁界を加えると共に、ノズル吐出孔より下部に直流磁界を加えたもの、比較例5は、ノズル吐出孔より上部にのみ交流磁界を加えたもの、比較例6は、鉄芯が非独立のもの、実施例1はノズル吐出孔より上部にのみ交流磁界と直流磁界を加えたものである。 Here, Comparative Examples 1 and 2 are those in which only an AC magnetic field is applied, Comparative Example 3 is a case in which a DC magnetic field is superimposed on the AC magnetic field, and a DC magnetic field is added below the nozzle discharge holes. In addition, an AC magnetic field is applied above the nozzle discharge hole and a DC magnetic field is applied below the nozzle discharge hole. Comparative Example 5 is an AC magnetic field applied only above the nozzle discharge hole. The iron core is non-independent. In Example 1, an AC magnetic field and a DC magnetic field are applied only above the nozzle discharge hole.
直流磁界と交流磁界の鉄芯が同一で非独立(特許文献3)の比較例6(図5参照)では、モールドフラックス性欠陥の低減効果や気泡の洗い流し効果が十分に得られなかったのは、直流の鉄芯が幅方向で抜けている部分が存在するので、鋳型の幅方向の磁場が均一になり難くなる結果、磁場に強弱が発生し、流動の乱れが起こり易くなるため、モールドフラックス性欠陥の低減効果や気泡の洗い流し効果が十分に得られなかったものと考えられる。 In Comparative Example 6 (see FIG. 5) in which the DC core and the AC magnetic core are the same and non-independent (see FIG. 5), the effect of reducing mold flux defects and the effect of washing away bubbles were not sufficiently obtained. Because there is a part where the DC iron core is missing in the width direction, the magnetic field in the width direction of the mold becomes difficult to be uniform. As a result, the strength of the magnetic field is generated and the flow disturbance is likely to occur. It is considered that the effect of reducing sexual defects and the effect of washing away bubbles were not sufficiently obtained.
前記説明においては、交流用電磁石として、極数が12極の櫛歯状の鉄芯22が用いられていたが、磁極数や鉄芯の形状は、これに限定されず、例えば鉄芯が分割されていても構わない。
In the above description, the comb-shaped
8…溶鋼
10…鋳型
12…浸漬ノズル
12a…吐出孔
20…交流磁界発生装置
22…櫛歯状鉄芯
24…交流用電極石のコイル
28…交流用電極石の磁極
30…直流磁界発生装置
34…直流用電極石の磁極
36…直流用電極石のコイル
DESCRIPTION OF
Claims (7)
互いに独立した交流磁界用磁極と直流磁界用磁極を用いて、
鋳型長辺の全幅にわたって、浸漬ノズルの吐出孔より上側の溶鋼のみに、交流磁界と直流磁界を重ねて印加することを特徴とする鋼の連続鋳造方法。 In the continuous casting method of steel that controls the flow of molten steel in the mold that is flowed by the immersion nozzle by applying a magnetic field at the magnetic pole that is opposed to the long side of the mold, arranged on the back side of the long side of the continuous casting mold,
Using magnetic poles for AC magnetic field and DC magnetic poles independent of each other,
A continuous casting method for steel, wherein an alternating magnetic field and a direct magnetic field are applied to only the molten steel above the discharge hole of the immersion nozzle over the entire width of the long side of the mold.
浸漬ノズルの吐出孔より上側の鋳型長辺の全幅にわたって配設された、互いに独立した交流磁界用磁極と直流磁界用磁極とを備え、
浸漬ノズルの吐出孔より上側のみに、交流磁界と直流磁界を重ねて印加するようにされていることを特徴とする鋼の連続鋳造設備。 Continuous casting equipment for steel that controls the flow of molten steel in the mold that is flowed by the immersion nozzle by applying a magnetic field at the magnetic pole facing the long side of the mold, placed on the back side of the long side of the continuous casting mold. In
An AC magnetic field magnetic pole and a DC magnetic field magnetic pole independent of each other, arranged over the entire width of the mold long side above the discharge hole of the immersion nozzle,
A continuous casting equipment for steel, wherein an AC magnetic field and a DC magnetic field are applied in an overlapping manner only above the discharge hole of the immersion nozzle.
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