JP2003094157A - Method for continuous casting of molten metal - Google Patents
Method for continuous casting of molten metalInfo
- Publication number
- JP2003094157A JP2003094157A JP2001291953A JP2001291953A JP2003094157A JP 2003094157 A JP2003094157 A JP 2003094157A JP 2001291953 A JP2001291953 A JP 2001291953A JP 2001291953 A JP2001291953 A JP 2001291953A JP 2003094157 A JP2003094157 A JP 2003094157A
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- mold
- short side
- molten metal
- continuous casting
- electromagnetic coil
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋳型内の溶融金属
に電磁力を作用させ、初期凝固の不安定を抑制して、鋳
片の表面性状を改善する溶融金属の連続鋳造方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting method for molten metal in which electromagnetic force is applied to the molten metal in a mold to suppress the instability of initial solidification and improve the surface quality of the slab. is there.
【０００２】[0002]
【従来の技術】通常、溶融金属の連続鋳造においては、
鋳型壁と凝固シェルの間に、所要の潤滑性を付与するた
め、溶鋼湯面に、潤滑剤パウダー（以下「パウダー」と
いうことがある。）が添加される。溶融したパウダー
は、上下に振動する鋳型壁と、一定速度で引き抜かれる
凝固シェルの相対運動によって、鋳型壁と凝固シェルの
間隙に流入する。2. Description of the Related Art Normally, in continuous casting of molten metal,
A lubricant powder (hereinafter sometimes referred to as “powder”) is added to the molten steel surface in order to provide a required lubricity between the mold wall and the solidified shell. The molten powder flows into the gap between the mold wall and the solidification shell by the relative motion of the vertically oscillating mold wall and the solidification shell that is pulled out at a constant speed.
【０００３】この流入の際に発生する動圧によって、メ
ニスカスや凝固シェル先端が変形する。この変形が、鋳
型オシレーションの周期で繰り返されて、鋳片表面に、
オシレーションマーク（周期的な皺）が形成されるが、
適切な深さの周期的なオシレーションマークは、鋳造操
業や鋳片の表面品質の安定化に寄与する。Due to the dynamic pressure generated during this inflow, the meniscus and the tip of the solidified shell are deformed. This deformation is repeated in the cycle of mold oscillation, and the slab surface,
Oscillation marks (periodic wrinkles) are formed,
The periodic oscillation marks of appropriate depth contribute to stabilizing the casting operation and the surface quality of the slab.
【０００４】鋳片の表面品質を確保するには、溶融金属
の初期凝固における不安定性を解消するとともに、鋳型
と凝固シェル間における潤滑性を確保することであり、
このための方法又は装置が種々提案されている。In order to secure the surface quality of the slab, it is necessary to eliminate the instability in the initial solidification of the molten metal and to secure the lubricity between the mold and the solidified shell.
Various methods or devices for this have been proposed.
【０００５】例えば、特開昭５２−３２８２４号公報に
は、溶融金属を潤滑剤とともに一定周期で振動する水冷
鋳型に注入し、鋳片を、連続的に下方に引き抜く連続鋳
造方法において、鋳型周りに設けた電磁コイルに交流電
流を連続的に通電し、発生する電磁力を利用して、鋳型
内の溶融金属を凸状に盛り上げて、鋳片の表面性状を改
善する方法が記載されている。For example, in Japanese Unexamined Patent Publication (Kokai) No. 52-32824, a molten metal is poured together with a lubricant into a water-cooled mold that vibrates at a constant cycle, and a cast piece is continuously drawn downward. AC current is continuously applied to the electromagnetic coil provided in, and the generated electromagnetic force is used to raise the molten metal in the mold in a convex shape to improve the surface quality of the slab. .
【０００６】また、特開昭６４−８３３４８号公報に
は、電磁コイルにより鋳型内の溶融金属に電磁力を付与
する際、交流磁場の付与により電磁力を間歇的に印加
し、凝固シェルと鋳型壁の間へのパウダーの流れ込みを
一層推進し、さらに、表面性状の改善を図る方法が記載
されている。Further, in Japanese Patent Laid-Open No. 64-83348, when an electromagnetic force is applied to a molten metal in a mold by an electromagnetic coil, the electromagnetic force is intermittently applied by applying an alternating magnetic field to solidify the shell and the mold. A method for further promoting the flow of powder between the walls and further improving the surface texture is described.
【０００７】しかし、この方法では、交流電流のパルス
で、溶融金属プール表面に、非通電時期にも残存する波
動が発生することがあり、この波動が原因で、凝固シェ
ルへのパウダー捕捉を引き起こすという問題が発生す
る。However, in this method, a pulse of an alternating current may generate a wave that remains on the surface of the molten metal pool even when the current is not applied, and this wave causes the powder to be trapped in the solidified shell. The problem occurs.
【０００８】これらの方法は、鋳片の表面を平滑化する
点で有効な方法であるが、メニスカス部においてパウダ
ーが溶鋼中に巻き込まれ、凝固シェルに捕捉され、鋳片
欠陥となるのを防止する点では、有効に作用しない。[0008] These methods are effective in smoothing the surface of the slab, but prevent the powder from being caught in the molten steel at the meniscus and trapped in the solidified shell, resulting in slab defects. It does not work effectively.
【０００９】一方、特開平２−３７９４３号公報には、
潤滑剤を使用しないで、メニスカスでの溶融金属プール
表面の擾乱が初期凝固に与える悪影響を排除して、表面
性状を改善する方法が記載されている。On the other hand, in Japanese Patent Laid-Open No. 2-37943,
Methods have been described to improve the surface texture without the use of lubricants, eliminating the adverse effects of perturbation of the molten metal pool surface at the meniscus on initial solidification.
【００１０】この方法は、所定の電気伝導度の耐火物
（グラファイト、アルミナグラファイト等）で鋳型を構
成し、その周囲に設けた電磁コイルにより鋳型を発熱さ
せ、溶融金属の凝固レベルを制御することにより、湯面
下凝固による連続鋳造を可能としたものである。According to this method, a mold is made of a refractory material (graphite, alumina graphite, etc.) having a predetermined electric conductivity, and the electromagnetic coil provided around the mold heats the mold to control the solidification level of the molten metal. As a result, continuous casting by under-solidification is possible.
【００１１】しかし、この方法では、鋳片引き抜き方向
において、完全に固相となる部位の直前には固液共存相
が必然的に存在して、この部位は充分な強度を持ってい
ないので、鋳片引き抜きの際、取り残されることもあ
り、安定した操業ができない。However, according to this method, a solid-liquid coexisting phase is inevitably present immediately before the portion where the solid phase is completely formed in the slab drawing direction, and this portion does not have sufficient strength. When the cast slab is pulled out, it may be left behind, which prevents stable operation.
【００１２】印加した電磁力は、溶融金属にも作用し、
金属と鋳型との接触圧、即ち、接触抵抗を減少させる方
向に働くが、この力を増大して初期の凝固を安定化しよ
うとすれば、鋳型及び金属の発熱量も増大して、結果と
して、初期の凝固の安定化が得られない。The applied electromagnetic force also acts on the molten metal,
The contact pressure between the metal and the mold acts in the direction of decreasing the contact resistance, but if this force is increased to stabilize the initial solidification, the calorific value of the mold and the metal also increases, and as a result, , Stabilization of initial solidification cannot be obtained.
【００１３】そこで、本発明者は、国際公開ＷＯ９６／
０５９２６号公報で、鋳片の表面性状を決定する初期凝
固及び鋳造の安定化を図ることができる溶融金属の連続
鋳造方法を提案した。Therefore, the inventor of the present invention has proposed the international publication WO96 /
Japanese Patent Laid-Open No. 05926 proposes a continuous casting method for molten metal which can stabilize the initial solidification and the casting that determine the surface properties of the slab.
【００１４】この方法は、連鋳鋳型を取り囲むように配
置したソレノイド状電磁コイル、又は、連鋳鋳型の側壁
に埋設したソレノイド状電磁コイルに交流電流を通電
し、凝固を開始しようとする溶融金属に、電磁力を、溶
融金属が鋳型壁から離れる方向に印加しつつ連続鋳造す
るものであり、該方法により、鋳片の表面品質を大幅に
改善することができる。According to this method, an alternating current is applied to a solenoid-shaped electromagnetic coil arranged so as to surround the continuous casting mold or a solenoid-shaped electromagnetic coil embedded in the side wall of the continuous casting mold to start solidification. In addition, the electromagnetic force is applied in the direction in which the molten metal moves away from the mold wall to continuously perform casting, and by this method, the surface quality of the cast piece can be greatly improved.
【００１５】しかし、連続鋳造において、矩形断面の鋳
型を用いる場合、鋳型内の磁束密度は、鋳型の長辺中央
部に比べ、短辺近傍において大きく、従って、溶融金属
に作用する電磁力（ローレンツ力）は、同様に、鋳型の
長辺中央部に比べ短辺近傍において大きい。However, in continuous casting, when a mold having a rectangular cross section is used, the magnetic flux density in the mold is larger in the vicinity of the short side than in the center of the long side of the mold, and therefore the electromagnetic force (Lorentz) acting on the molten metal is large. Similarly, the force) is larger in the vicinity of the short side than in the center of the long side of the mold.
【００１６】その結果、溶融金属の盛り上がりの時間平
均値と変動が、鋳型の長辺中央部に比べ、短辺近傍にお
いて大きくなり、鋳片の表面性状を改善する効果が、凝
固シェルに有効に作用しないか、もしくは、作用したと
しても、その程度が、鋳型の長辺と短辺とで異なるとい
う課題が生じる。As a result, the time average value and fluctuation of the rise of the molten metal become larger in the vicinity of the shorter side than in the center of the longer side of the mold, and the effect of improving the surface quality of the slab is effective for the solidified shell. There is a problem that it does not work, or even if it works, the extent of the difference is different between the long side and the short side of the mold.
【００１７】[0017]
【発明が解決しようとする課題】本発明は、鋳型の長辺
と短辺において溶融金属に作用する電磁力（ローレンツ
力）が異なることに起因して生じる鋳片の表面性状に係
る上記課題を、電磁コイルと鋳型の配設関係の点から解
決しようとするものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems relating to the surface properties of cast slabs caused by the difference in the electromagnetic force (Lorentz force) acting on the molten metal between the long side and the short side of the mold. The present invention aims to solve the problem in terms of the arrangement relationship between the electromagnetic coil and the mold.
【００１８】[0018]
【課題を解決するための手段】本発明者は、上記課題を
解決するため、電磁コイルの寸法と鋳型の寸法に着目
し、これら寸法と鋳片の表面性状の良否との関連につい
て鋭意調査研究した。In order to solve the above-mentioned problems, the present inventor has paid attention to the dimensions of the electromagnetic coil and the mold, and has made an earnest research study on the relationship between these dimensions and the quality of the surface properties of the slab. did.
【００１９】その結果、矩形断面の鋳型を用いる連続鋳
造において、電磁コイルの寸法と鋳型の寸法の間には、
優れた表面性状の鋳片を得ることができる適正な寸法関
係が存在することが判明した。As a result, in continuous casting using a mold having a rectangular cross section, between the size of the electromagnetic coil and the size of the mold,
It has been found that there is a proper dimensional relationship with which a slab with excellent surface properties can be obtained.
【００２０】本発明は、上記知見に基づくものであり、
その要旨は、以下のとおりである。The present invention is based on the above findings,
The summary is as follows.
【００２１】（１）短辺が移動可能な矩形断面の鋳型の
周囲に電磁コイルを配設し、電磁コイルに交流電流を通
電しながら溶融金属を連続鋳造する方法において、鋳型
の寸法と電磁コイルの寸法が下記式を満たす範囲で、鋳
型の短辺を移動することを特徴とする溶融金属の連続鋳
造方法。(1) In a method of arranging an electromagnetic coil around a mold having a rectangular cross-section whose movable short side is movable and continuously casting molten metal while applying an alternating current to the electromagnetic coil, the size of the mold and the electromagnetic coil The method for continuous casting of molten metal is characterized in that the short side of the mold is moved within the range where the dimension of the above satisfies the following formula.
【００２２】
０．２≦（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）≦０．８
ここで、Ｌmw：鋳型の長辺内寸、Ｌmn：鋳型の短辺内
寸、Ｌcw：電磁コイルの長辺内寸、Ｌcn：電磁コイルの
短辺内寸である。0.2 ≦ (Lcn−Lmn) / (Lcw−Lmw) ≦ 0.8 where Lmw: inner dimension of long side of mold, Lmn: inner dimension of short side of mold, Lcw: long side of electromagnetic coil Inner size, Lcn: Inner size of the short side of the electromagnetic coil.
【００２３】（２）前記電磁コイルに１ｋHz以下の交流
電流を通電することを特徴とする前記（１）に記載の溶
融金属の連続鋳造方法。(2) The continuous casting method for molten metal according to (1), wherein an alternating current of 1 kHz or less is applied to the electromagnetic coil.
【００２４】[0024]
【発明の実施の形態】図１に、矩形断面の鋳型１の周囲
にソレノイド状の電磁コイル４を配設した連続鋳造鋳型
１を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a continuous casting mold 1 in which a solenoid-shaped electromagnetic coil 4 is arranged around a mold 1 having a rectangular cross section.
【００２５】本発明においては、図に示すように、鋳型
の長辺内寸をＬmw、鋳型の短辺内寸をＬmnとし、また、
電磁コイルの長辺内寸をＬcw、電磁コイルの短辺内寸を
Ｌcnとし、（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）なる寸法関
係式を、指標として採用する。In the present invention, as shown in the drawing, the inner dimension of the long side of the mold is Lmw, the inner dimension of the short side of the mold is Lmn, and
The inner dimension of the long side of the electromagnetic coil is Lcw, the inner dimension of the short side of the electromagnetic coil is Lcn, and a dimensional relational expression of (Lcn-Lmn) / (Lcw-Lmw) is adopted as an index.
【００２６】本発明においてこのような寸法関係を指標
として採用する理由は、溶融金属に作用する電磁力は、
コイルと鋳型の間隔の関数であり、短辺におけるコイル
と鋳型の間隔と長辺におけるコイルと鋳型の間隔の比を
変化させることにより、短辺部および長辺部における電
磁力を制御できるからである。The reason for adopting such a dimensional relationship as an index in the present invention is that the electromagnetic force acting on the molten metal is
It is a function of the distance between the coil and the mold, and by changing the ratio of the distance between the coil and the mold on the short side and the distance between the coil and the mold on the long side, the electromagnetic force on the short side and the long side can be controlled. is there.
【００２７】本発明者は、上記寸法関係を種々変化させ
ることにより、溶融金属に作用する電磁力を変化させ、
その変化と、鋳片の表面性状との関係を調査した。The present inventor changes the electromagnetic force acting on the molten metal by variously changing the above-mentioned dimensional relationship,
The relationship between the change and the surface quality of the slab was investigated.
【００２８】その結果、（Ｌcn−Ｌmn）／（Ｌcw−Ｌm
w）が０．８を超える場合には、鋳型の短辺近傍におい
て、鋳型内の磁束密度が大きく、溶融金属に作用するロ
ーレンツ力が大きくなり、その結果、鋳型の短辺近傍に
おける溶融金属の盛り上がりの時間平均と変動が、鋳型
の長辺中央部における上記時間平均と変動に比べ、大き
くなり、電磁力による表面性状改善効果が有効に作用し
ないことが判明した。As a result, (Lcn-Lmn) / (Lcw-Lm)
When w) exceeds 0.8, the magnetic flux density in the mold is large near the short side of the mold, and the Lorentz force acting on the molten metal becomes large. It was found that the time average and the fluctuation of the swelling became larger than the time average and the fluctuation in the central portion of the long side of the mold, and the effect of improving the surface texture by the electromagnetic force did not work effectively.
【００２９】また、（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）が
０．２未満の場合には、鋳型の短辺近傍において、鋳型
内の磁束密度が小さくなって、溶融金属に作用するロー
レンツ力が小さくなり、その結果、鋳型の短辺側におい
て、電磁力による表面性状改善効果を期待できないこと
が判明した。When (Lcn-Lmn) / (Lcw-Lmw) is less than 0.2, the magnetic flux density in the mold becomes small near the short side of the mold, and the Lorentz force acting on the molten metal. As a result, it was found that the effect of improving the surface texture by the electromagnetic force cannot be expected on the short side of the mold.
【００３０】したがって、矩形断面の鋳型の周囲に電磁
コイルを配設し、電磁コイルに交流電流を通電しながら
溶融金属を連続鋳造する場合において、優れた表面性状
の鋳片を得るためには、鋳型の寸法と電磁コイルの寸法
を、下記式を満たすように設定するとともに、下記式
が、鋳造中、常に満たされていることが重要である。Therefore, in the case of disposing an electromagnetic coil around a mold having a rectangular cross section and continuously casting molten metal while applying an alternating current to the electromagnetic coil, in order to obtain a slab having excellent surface properties, It is important that the size of the mold and the size of the electromagnetic coil are set so as to satisfy the following equation, and that the following equation is always satisfied during casting.
【００３１】
０．２≦（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）≦０．８
ここで、Ｌmw：鋳型の長辺内寸、Ｌmn：鋳型の短辺内
寸、Ｌcw：電磁コイルの長辺内寸、Ｌcn：電磁コイルの
短辺内寸である。0.2 ≦ (Lcn−Lmn) / (Lcw−Lmw) ≦ 0.8 where Lmw: inner dimension of long side of mold, Lmn: inner dimension of short side of mold, Lcw: long side of electromagnetic coil Inner size, Lcn: Inner size of the short side of the electromagnetic coil.
【００３２】したがって、鋳造開始時又は鋳造中、鋳型
の短辺を移動し、鋳片の幅を変える場合、鋳型及び電磁
コイルの寸法が上記式を満たす範囲内で移動する必要が
ある。また、連続鋳造の作業中、鋳造条件が変動し上記
式が満たされなくなった場合には、上記式を満たすよう
に、鋳型の短辺を移動する。Therefore, when the short side of the mold is moved to change the width of the slab at the start of casting or during casting, it is necessary that the dimensions of the mold and the electromagnetic coil are moved within the range satisfying the above formula. When the casting conditions change during the continuous casting operation and the above equation is no longer satisfied, the short side of the mold is moved so as to satisfy the above equation.
【００３３】このように、本発明においては、鋳型の短
辺を移動し、（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）を、常
に、上記範囲内にあるようにすることができ、このこと
により、鋳型の短辺近傍における溶融金属の盛り上がり
の時間平均と変動を、鋳型の長辺中央部における上記時
間平均と変動と同程度のものにし、鋳型の短辺側でも、
同長辺側と同様に、表面性状改善効果を有効に得ること
ができる。As described above, in the present invention, it is possible to move the shorter side of the mold so that (Lcn-Lmn) / (Lcw-Lmw) is always within the above range. , The time average and fluctuation of the rise of the molten metal in the vicinity of the short side of the mold, the same as the time average and fluctuation in the center of the long side of the mold, even on the short side of the mold,
As with the same long side, the effect of improving the surface quality can be effectively obtained.
【００３４】また、本発明においては、電磁コイルに、
１ｋHz以下の交流電流を通電すると、上記式に基づく表
面性状改善効果をより有効に得ることができる。Further, in the present invention, the electromagnetic coil is
When an alternating current of 1 kHz or less is applied, the effect of improving the surface texture based on the above formula can be more effectively obtained.
【００３５】以下、本発明の実施例について説明する
が、本発明は、実施例で用いた条件に限定されるもので
はない。Examples of the present invention will be described below, but the present invention is not limited to the conditions used in the examples.
【００３６】[0036]
【実施例】（実施例）
（ａ）長辺１５００mm×短辺２５０mm、高さ８００mmの
鋳型、（ｂ）長辺１４５０mm×短辺２５０mm、高さ８０
０mmの鋳型、（ｃ）長辺１０００mm×短辺２５０mm、高
さ８００mmの鋳型、及び、（ｄ）長辺８７５mm×短辺２
５０mm、高さ８００mmの鋳型と、（ｐ）長辺１６５０mm
×短辺４００mm、高さ１００mmの電磁コイル、（ｑ）長
辺１６５０mm×短辺４１５mm、高さ１００mmの電磁コイ
ル、及び（ｒ）長辺１８５０mm×短辺４００mm、高さ１
００mmの電磁コイルを組み合わせて各種の連続鋳造鋳型
を構成した。(Example) (a) Mold having a long side of 1500 mm x short side of 250 mm and a height of 800 mm, (b) long side of 1450 mm x short side of 250 mm, height 80
0 mm mold, (c) long side 1000 mm x short side 250 mm, height 800 mm, and (d) long side 875 mm x short side 2
50 mm, 800 mm high mold, (p) long side 1650 mm
× 400 mm short side, height 100 mm electromagnetic coil, (q) long side 1650 mm × short side 415 mm, height 100 mm electromagnetic coil, and (r) long side 1850 mm × short side 400 mm, height 1
Various continuous casting molds were constructed by combining electromagnetic coils of 00 mm.
【００３７】この組み合わせと、該組み合わせにおける
（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）の値を、表１に示す。Table 1 shows this combination and the value of (Lcn-Lmn) / (Lcw-Lmw) in the combination.
【００３８】[0038]
【表１】 [Table 1]
【００３９】この連続鋳造鋳型を用い、鋳型振動：スト
ローク６mm、サイクル１５０cpm、引抜き速度：１ｍ／m
in、の条件下で、粘度１ポアズのＣ−Ca−SiＯ2−Al2Ｏ
3−Na系の潤滑剤を供給しつつ、湯面レベルを電磁コイ
ル上端（鋳型上端から１００mm）に維持し、電磁コイル
には、単相交流２００Hzを通電し、１２００ガウス（最
大実効値）の０．０５秒印加と０．０５秒無印加を繰り
返す磁場条件において、低炭素鋼を連続鋳造した。Using this continuous casting mold, mold vibration: stroke 6 mm, cycle 150 cpm, drawing speed: 1 m / m
in, under the conditions of, the viscosity 1 Poise C-Ca-SiO 2 -Al 2 O
While supplying the 3- Na-based lubricant, maintain the molten metal surface level at the upper end of the electromagnetic coil (100 mm from the upper end of the mold). A low carbon steel was continuously cast under a magnetic field condition in which application of 0.05 seconds and no application of 0.05 seconds were repeated.
【００４０】得られた鋳片において、鋳型短辺から１０
mmの部位の表面粗度（μｍ）を測定した。その結果を表
２と図２に示す。なお、表２には、参考まで、電磁力を
印加しない場合における表面粗度を示した。In the obtained slab, the length from the short side of the mold was 10
The surface roughness (μm) of the portion of mm was measured. The results are shown in Table 2 and FIG. For reference, Table 2 shows the surface roughness when no electromagnetic force is applied.
【００４１】[0041]
【表２】 [Table 2]
【００４２】表２及び図２に示すように、低炭素鋼の溶
鋼に電磁力を印加すると、格段に、鋳片の表面性状が向
上するが、さらに、（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）が
０．２以上０．８以下の範囲で、表面粗度が５０μｍ以
下の優れた表面性状の鋳片が得られている。As shown in Table 2 and FIG. 2, when the electromagnetic force is applied to the molten steel of low carbon steel, the surface quality of the slab is remarkably improved, and further, (Lcn-Lmn) / (Lcw-Lmw). ) Is in the range of 0.2 or more and 0.8 or less, a slab having an excellent surface texture with a surface roughness of 50 μm or less is obtained.
【００４３】[0043]
【発明の効果】本発明によれば、鋳型の短辺側において
も、同長辺側と同様に、表面性状改善効果を有効に得る
ことができるので、優れた表面品質の鋳片を安定して連
続鋳造することができる。その結果、連続鋳造における
生産性を高めることができる。According to the present invention, even on the short side of the mold, the surface quality improving effect can be effectively obtained as in the case of the same long side, so that a slab having excellent surface quality can be stabilized. Can be continuously cast. As a result, productivity in continuous casting can be improved.
【図１】矩形断面の鋳型の周囲にソレノイド状の電磁コ
イルを配設した連続鋳造鋳型を示す図である。FIG. 1 is a view showing a continuous casting mold in which solenoid-shaped electromagnetic coils are arranged around a mold having a rectangular cross section.
【図２】（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）と、鋳型短辺
から１０mmの部位の表面粗度（μｍ）の関係を示す図で
ある。FIG. 2 is a diagram showing the relationship between (Lcn-Lmn) / (Lcw-Lmw) and the surface roughness (μm) of a portion 10 mm from the short side of the mold.
１…連続鋳造鋳型 ２…鋳型の長辺 ３…鋳型の短辺 ４…電磁コイル 1 ... Continuous casting mold 2 ... long side of mold 3 ... Short side of mold 4 ... Electromagnetic coil
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原田 寛 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 Ｆターム(参考） 4E004 AA09 AE02 MA03 MB11 NB01 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiroshi Harada 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel shares Company Technology Development Division F-term (reference) 4E004 AA09 AE02 MA03 MB11 NB01
Claims (2)
に電磁コイルを配設し、電磁コイルに交流電流を通電し
ながら溶融金属を連続鋳造する方法において、鋳型の寸
法と電磁コイルの寸法が下記式を満たす範囲で、鋳型の
短辺を移動することを特徴とする溶融金属の連続鋳造方
法。 ０．２≦（Ｌcn−Ｌmn）／（Ｌcw−Ｌmw）≦０．８ ここで、Ｌmw：鋳型の長辺内寸 Ｌmn：鋳型の短辺内寸 Ｌcw：電磁コイルの長辺内寸 Ｌcn：電磁コイルの短辺内寸1. A method of continuously casting a molten metal while arranging an electromagnetic coil around a mold having a rectangular cross section whose short side is movable, and applying an alternating current to the electromagnetic coil, wherein the size of the mold and the electromagnetic coil A method for continuous casting of molten metal, characterized in that the short side of the mold is moved within a range in which the dimensions satisfy the following formula. 0.2 ≦ (Lcn−Lmn) / (Lcw−Lmw) ≦ 0.8 where Lmw: Inner dimension of long side of mold Lmn: Inner dimension of short side of mold Lcw: Inner dimension of long side of electromagnetic coil Lcn: Electromagnetic Inside dimension of short side of coil
を通電することを特徴とする請求項１に記載の溶融金属
の連続鋳造方法。2. The continuous casting method for molten metal according to claim 1, wherein an alternating current of 1 kHz or less is applied to the electromagnetic coil.
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