JP4967856B2 - Steel continuous casting method - Google Patents

Steel continuous casting method Download PDF

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JP4967856B2
JP4967856B2 JP2007170578A JP2007170578A JP4967856B2 JP 4967856 B2 JP4967856 B2 JP 4967856B2 JP 2007170578 A JP2007170578 A JP 2007170578A JP 2007170578 A JP2007170578 A JP 2007170578A JP 4967856 B2 JP4967856 B2 JP 4967856B2
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mold
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molten steel
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JP2009006370A (en
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正幸 川本
信宏 岡田
方史 花尾
幸司 高谷
晃三 太田
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Sumitomo Metal Industries Ltd
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Priority to ES08740581.7T priority patent/ES2694707T3/en
Priority to PL08740581T priority patent/PL2158985T3/en
Priority to PCT/JP2008/057511 priority patent/WO2009001609A1/en
Priority to EP08740581.7A priority patent/EP2158985B1/en
Priority to CN2008800192911A priority patent/CN101678446B/en
Priority to BRPI0812965-7A priority patent/BRPI0812965B1/en
Priority to KR1020097025091A priority patent/KR101154055B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring

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  • Mechanical Engineering (AREA)
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Description

本発明は、電磁ブレーキと電磁攪拌を兼用可能な電磁コイル装置により、鋳型内溶鋼の流れを制御しつつ鋼を連続鋳造する方法に関するものである。   The present invention relates to a method for continuously casting steel while controlling the flow of molten steel in a mold using an electromagnetic coil device capable of both electromagnetic braking and electromagnetic stirring.

一般的な鋼の連続鋳造では、２つの吐出孔を有する浸漬ノズルを用いて鋳型内に溶鋼を給湯する。図２は、この一般的な連続鋳造法における鋳型内溶鋼の流動状態を模式的に示す縦断面図であるが、図２に示すように、浸漬ノズル１の吐出口１ａから出た溶鋼２は鋳型３の短辺３ａに衝突した後、上昇流２ａと下降流２ｂに分岐する。そして、上昇流２ａは、さらにメニスカス位置において、浸漬ノズル１へ向かう水平流となる。
なお、図２中の４はパウダーを示す。 In general continuous casting of steel, molten steel is supplied into a mold using an immersion nozzle having two discharge holes. FIG. 2 is a longitudinal sectional view schematically showing the flow state of the molten steel in the mold in this general continuous casting method. As shown in FIG. 2, the molten steel 2 coming out from the discharge port 1a of the immersion nozzle 1 is After colliding with the short side 3a of the casting mold 3, it branches into an upward flow 2a and a downward flow 2b. Then, the upward flow 2a becomes a horizontal flow toward the immersion nozzle 1 at the meniscus position.
In addition, 4 in FIG. 2 shows powder.

この鋳型内における溶鋼の流動制御は、操業上ならびに鋳片の品質管理上、極めて重要であり、この溶鋼の流動制御を実現する方法として、浸漬ノズルの形状を工夫する方法、鋳型内の溶鋼に電磁力を作用させる方法などがある。このうちでは、後者の溶鋼に電磁力を作用させる方法が広く利用されており、溶鋼吐出流に制動力を作用させる電磁ブレーキと、溶鋼を電磁力により攪拌する電磁攪拌に大別される。   The flow control of the molten steel in the mold is extremely important for the operation and quality control of the slab. As a method for realizing the flow control of the molten steel, a method of devising the shape of the immersion nozzle, There are methods such as applying electromagnetic force. Among these, the method of applying an electromagnetic force to the latter molten steel is widely used, and is roughly divided into an electromagnetic brake that applies a braking force to the molten steel discharge flow and an electromagnetic stirring that stirs the molten steel by the electromagnetic force.

電磁ブレーキと電磁攪拌は、それぞれに長所と短所があるが、一般的には高速鋳造時は電磁ブレーキが、また、低速鋳造時は電磁攪拌が用いられている。これらの電磁ブレーキ、電磁攪拌装置は、共に鉄芯にコイルを巻き線した電磁コイル装置を鋳型背面に設置することにより実現しているが、通常、これらの電磁コイル装置は、通常、電磁ブレーキ又は電磁攪拌のどちらか単独の機能しか有していない。   The electromagnetic brake and the electromagnetic stirring have advantages and disadvantages, respectively. Generally, the electromagnetic brake is used at high speed casting, and the electromagnetic stirring is used at low speed casting. Both of these electromagnetic brakes and electromagnetic stirrers are realized by installing an electromagnetic coil device in which a coil is wound around an iron core on the back of the mold. It has only one function of electromagnetic stirring.

そこで、以前から電磁ブレーキと電磁攪拌の両機能の兼用を可能となす電磁コイル装置（以後、兼用コイルと言う。）が開発され、出願人も特許文献１、２を提案している。
特開２００５−３４９４５４号公報 特開２００７−００７７１９号公報 In view of this, an electromagnetic coil device (hereinafter referred to as a combined coil) that can be used for both functions of electromagnetic brake and electromagnetic stirring has been developed, and the applicant has also proposed Patent Documents 1 and 2.
JP 2005-349454 A JP 2007-007719 A

出願人が提案した前記特許文献１、２の兼用コイルは、鋳型の外周に配置した電磁コイルに、直流又は交流の電流を供給することにより、鋳型内の溶鋼に電磁ブレーキ又は電磁攪拌を選択的に作用させるものである。   The combined coil disclosed in Patent Documents 1 and 2 proposed by the applicant selectively supplies electromagnetic brake or electromagnetic stirring to molten steel in the mold by supplying direct current or alternating current to the electromagnetic coil disposed on the outer periphery of the mold. It acts on.

この特許文献１、２で提案された兼用コイルは、条件によって電磁ブレーキと電磁攪拌を選択的に作用させる可能性を有するもので、従来不可能であった電磁ブレーキと電磁攪拌の兼用を可能にするものである。   The dual-purpose coil proposed in Patent Documents 1 and 2 has the possibility of selectively acting on the electromagnetic brake and electromagnetic stirring depending on conditions, and enables the combined use of electromagnetic braking and electromagnetic stirring, which was impossible in the past. To do.

しかしながら、実際に鋼を連続鋳造する際に、具体的にどのように電流の印加を行えば良いのかが明らかではなかった。   However, it was not clear how to apply current when actually casting steel.

本発明が解決しようとする問題点は、出願人が提案した電磁ブレーキと電磁攪拌の両機能の兼用を可能とする兼用コイルは、どのように電流を印加させれば良いのかが明らかでないという点である。   The problem to be solved by the present invention is that it is not clear how the current is applied to the dual-purpose coil that enables both the electromagnetic brake function and the electromagnetic stirring function proposed by the applicant. It is.

本発明の鋼の連続鋳造方法は、
兼用コイルへの電流の印加態様を具体化するもので、
２個の磁極鉄芯と、この磁極鉄芯のそれぞれの外周部に巻き回した２個のコイルと、２個の磁極鉄芯を合わせた外周部に巻き回した１個のコイルを有する電磁コイルを、鋳型長辺の外周に、各長辺で同じ個数で、鋳型長辺の外周合計で（２ｎ＋２）個（ｎは自然数）配置し、
鋳型内溶鋼を電磁攪拌する際には、全ての前記電磁コイルにおける各コイルに、電流位相差が９０度から１２０度の３相以上の多相交流電流を通電し、
鋳型内溶鋼に電磁ブレーキを付与する際には、前記各電磁コイル当たり、前記２個の磁極鉄芯を合わせた外周部に巻き回された１個の前記コイルに直流電流を通電するか、またはこれら３個のコイルに直流電流を通電して鋼を連続鋳造する方法であって、
鋳型に給湯する溶鋼の成分組成と給湯量に対応させて、電磁ブレーキまたは電磁攪拌を選択的に切り替えることを最も主要な特徴としている。 The steel continuous casting method of the present invention is
It embodies the application mode of the current to the dual-purpose coil,
Electromagnetic coil having two magnetic pole iron cores, two coils wound around the outer periphery of each of the magnetic pole iron cores, and one coil wound around the outer periphery of the two magnetic pole iron cores Are arranged on the outer periphery of the long side of the mold in the same number on each long side, and the total perimeter of the long side of the mold is (2n + 2) (n is a natural number),
When electromagnetically stirring molten steel in a mold, a multiphase alternating current of three or more phases with a current phase difference of 90 to 120 degrees is passed through each coil in all the electromagnetic coils,
When applying an electromagnetic brake to the molten steel in the mold, a direct current is applied to one of the coils wound around the outer periphery of the two magnetic pole cores for each electromagnetic coil, or A method of continuously casting steel by passing a direct current through these three coils,
The main feature is that the electromagnetic brake or the electromagnetic stirring is selectively switched according to the composition of the molten steel to be supplied to the mold and the amount of hot water supplied.

より具体的には、
鋳型に供給する前記溶鋼の成分炭素濃度が、
質量％で、０．０７％以上、０．１６％以下である場合は、
給湯量が３t／min未満では、鋳型内の溶鋼に電磁攪拌を作用させるべく印加し、
給湯量が３t／min以上では、鋳型内の溶鋼に電磁ブレーキを作用させるべく印加する。 More specifically,
The component carbon concentration of the molten steel supplied to the mold is
When it is 0.07% or more and 0.16% or less in mass%,
When the amount of hot water supply is less than 3 t / min, it is applied to make electromagnetic stirring act on the molten steel in the mold,
When the amount of hot water supply is 3 t / min or more, it is applied so that an electromagnetic brake is applied to the molten steel in the mold.

また、鋳型に供給する前記溶鋼の成分炭素濃度が、
質量％で、０．００５０％を超え、０．０７％未満である場合は、
給湯量が４t／min未満では、鋳型内の溶鋼に電磁攪拌を作用させるべく印加し、
給湯量が４t／min以上では、鋳型内の溶鋼に電磁ブレーキを作用させるべく印加する。 The component carbon concentration of the molten steel supplied to the mold is
If it is more than 0.0050% and less than 0.07% by mass%,
When the amount of hot water supply is less than 4 t / min, it is applied to cause electromagnetic stirring to act on the molten steel in the mold,
When the amount of hot water supply is 4 t / min or more, the electromagnetic brake is applied to the molten steel in the mold.

さらに、鋳型に供給する前記溶鋼の成分炭素濃度が、
質量％で、０．００５０％以下である場合は、
給湯量が５t／min未満では、鋳型内の溶鋼に電磁攪拌を作用させるべく印加し、
給湯量が５t／min以上では、鋳型内の溶鋼に電磁ブレーキを作用させるべく印加する。 Furthermore, the component carbon concentration of the molten steel supplied to the mold is
If it is less than 0.0050% by mass%,
When the amount of hot water supply is less than 5 t / min, it is applied to make electromagnetic stirring act on the molten steel in the mold,
When the amount of hot water supply is 5 t / min or more, it is applied so that an electromagnetic brake is applied to the molten steel in the mold.

本発明の鋼の連続鋳造方法によって、鋼種や鋳造条件によらずに、良好な鋳片を安定して得ることができるようになる。   According to the continuous casting method of steel of the present invention, a good slab can be stably obtained regardless of the steel type and casting conditions.

以下、本発明の着想から課題解決に至るまでの過程と共に、本発明を実施するための最良の形態について、図１を用いて説明する。
発明者らは、鋼の連続鋳造に際し、特許文献２で提案した兼用コイルを使用した場合に、鋳造条件に対してどのように選択的な印加をすべきかについて考えた。 Hereinafter, the best mode for carrying out the present invention will be described with reference to FIG. 1 together with the process from the idea of the present invention to the solution of the problem.
The inventors have considered how to selectively apply the casting conditions when the dual-purpose coil proposed in Patent Document 2 is used in continuous casting of steel.

ところで、電磁ブレーキは、浸漬ノズルからの吐出流速を低下させ、凝固シェルへの衝突流速の低下による、不均一凝固に起因する縦割れの緩和や、再溶解の抑制に効果がある。一方、電磁攪拌は、凝固シェルと平行な溶鋼流速の付与によってメニスカスの流速を上昇させ、気泡や介在物の凝固シェルへの捕捉を防止するので、表面疵の防止に効果がある。   By the way, the electromagnetic brake is effective in reducing the discharge flow rate from the submerged nozzle and alleviating vertical cracks due to non-uniform solidification due to a decrease in the collision flow rate to the solidified shell, and suppressing remelting. On the other hand, electromagnetic stirring increases the meniscus flow rate by applying a molten steel flow rate parallel to the solidified shell and prevents trapping of bubbles and inclusions in the solidified shell, which is effective in preventing surface flaws.

発明者らは、これらを条件に応じて選択するに際し、鋼の基礎成分である炭素濃度と、現在、電磁ブレーキと電磁攪拌を使い分けている鋳造速度の要因の一つである鋳型への給湯量を変化させて調査を行なうことにした。   When the inventors select these according to conditions, the amount of hot water supplied to the mold, which is one of the factors of the carbon concentration, which is the basic component of steel, and the casting speed that currently uses electromagnetic braking and electromagnetic stirring properly It was decided to investigate by changing.

以下、発明者らが行った調査結果について説明する。
幅が１５００mm、厚さが２７０mmの鋳片を製造可能な垂直曲げ型連続鋳造機で、下記表１に示す化学組成を有する溶鋼を鋳造した。 Hereinafter, the results of investigations conducted by the inventors will be described.
Molten steel having the chemical composition shown in Table 1 was cast by a vertical bending type continuous casting machine capable of producing a slab having a width of 1500 mm and a thickness of 270 mm.

Figure 0004967856
Figure 0004967856

図１に鋳造に使用した電磁ブレーキ、電磁攪拌の兼用コイルと、その代表的な寸法を併せて示す。図１中の５は鋳型３のそれぞれの長辺３ｂ側に連続配置された２つの兼用コイルであり、２個のティース部５ａそれぞれに巻き線５ｂを施し、更に２個のティース部５ａの外側に巻き線５ｃを施してひとつにまとめている。なお、５ｄは上端をメニスカスと同じ高さとされたコア、６は鋳型３の外側に設置したバックアッププレートを示す。   FIG. 1 also shows the electromagnetic brake used for casting and the electromagnetic stirring combined coil and the typical dimensions thereof. In FIG. 1, reference numeral 5 denotes two dual-purpose coils continuously arranged on the long side 3b side of the mold 3, and each of the two tooth portions 5a is provided with a winding 5b, and further outside the two tooth portions 5a. Are wound together with a winding 5c. In addition, 5d shows the core which made the upper end the same height as the meniscus, and 6 shows the backup plate installed in the outer side of the casting_mold | template 3. FIG.

また、電磁ブレーキ、電磁攪拌の兼用コイルの仕様を下記に示す。また、鋳造条件を下記表２に、鋳造結果を下記表３に示す。   The specifications of the electromagnetic brake and electromagnetic stirring coil are shown below. The casting conditions are shown in Table 2 below, and the casting results are shown in Table 3 below.

（兼用コイルの仕様）
鋳型中心部の電磁力：３０００Gauss
周波数：４．０Hz
コイルへの印加電流：４５０００AT
交流電流の位相：１２０°位相の３相交流 (Combined coil specifications)
Electromagnetic force at the center of the mold: 3000 Gauss
Frequency: 4.0Hz
Current applied to the coil: 45000AT
AC current phase: 120 ° phase 3-phase AC

Figure 0004967856
Figure 0004967856

Figure 0004967856
Figure 0004967856

鋼種Ａ群は、炭素濃度が、質量％で、０．００５０％を超え、０．０７％未満である低炭素アルミキルド鋼であって、不均一凝固が発生しにくく、表面疵の検査基準も高くない。従って、従来から電磁ブレーキや電磁攪拌をかけなくても、給湯量が５．７t／minの高速であっても鋳造が可能であった（比較例２３）。   Steel Group A is a low-carbon aluminum killed steel with a carbon concentration of more than 0.0050% and less than 0.07% by mass%, and it is difficult for non-uniform solidification to occur, and the inspection standard for surface defects is high. Absent. Therefore, casting was possible even at high speed of 5.7 t / min without using an electromagnetic brake or electromagnetic stirring conventionally (Comparative Example 23).

しかしながら、電磁ブレーキをかけない場合、給湯量が４t／min以上になると、ブレークアウト比率の増加が見られた（比較例２２，２３）。一方、給湯量が４t／min未満の場合は、電磁攪拌をかけない場合は、表面疵が多発した（比較例２１）。
However, when the electromagnetic brake was not applied, an increase in the breakout ratio was observed when the amount of hot water supply was 4 t / min or more (Comparative Examples 22 and 23). On the other hand, when the amount of hot water supply was less than 4 t / min, surface flaws occurred frequently when no electromagnetic stirring was applied (Comparative Example 21).

これに対して、給湯量が４t／min以上の場合は、電磁ブレーキをかけることで安定した鋳造が実現した（実施例２〜４，１４）。また、給湯量が４t／min未満の場合は、電磁攪拌をかけることによって、表面疵発生率が減少した（実施例１，１３）。   On the other hand, when the amount of hot water supply was 4 t / min or more, stable casting was realized by applying an electromagnetic brake (Examples 2 to 4, 14). Moreover, when the amount of hot water supply was less than 4 t / min, the surface flaw occurrence rate decreased by applying electromagnetic stirring (Examples 1 and 13).

鋼種Ｂ群は、炭素濃度が、質量％で、０．００５０％以下である極低炭素鋼であって、不均一凝固は発生しにくいが、表面疵の検査基準が非常に高い。電磁攪拌や電磁ブレーキをかけない場合は、給湯量が５t／min未満の場合は表面疵が発生し（比較例２４）、給湯量が５t／min以上の場合は表面疵が多発した（比較例２５）。   Steel group B is an ultra-low carbon steel having a carbon concentration of 0.0050% or less in terms of mass%, and non-uniform solidification hardly occurs, but the inspection standard for surface defects is very high. When electromagnetic stirring or electromagnetic brake is not applied, surface flaws occur when the amount of hot water supply is less than 5 t / min (Comparative Example 24), and surface flaws occur frequently when the amount of hot water supply is 5 t / min or more (Comparative Example). 25).

この鋼種Ｂ群では、給湯量が５t／min未満の場合は電磁攪拌が有効であり、特にその効果が大きかったが（実施例５〜７，１５）、給湯量が５t／min以上の場合に電磁ブレーキをかけることも有効であった（実施例８，１６）。   In this steel type B group, electromagnetic stirring was effective when the amount of hot water supply was less than 5 t / min, and the effect was particularly great (Examples 5 to 7 and 15), but when the amount of hot water supply was 5 t / min or more. It was also effective to apply an electromagnetic brake (Examples 8 and 16).

鋼種Ｃ群は、炭素濃度が、質量％で、０．０７％以上、０．１６％以下の亜包晶鋼であって、不均一凝固が発生しやすく、表面疵の検査基準は低い。この鋼種Ｃ群は、電磁攪拌や電磁ブレーキをかけない場合は、給湯量が４．３t／min以上になると縦割れや再溶解が発生し、ブレークアウトの確率が非常に高くなった（比較例２７，２８）。   Steel type C is a sub-peritectic steel having a carbon concentration of 0.07% or more and 0.16% or less in terms of mass%, and uneven solidification is likely to occur, and the inspection standard for surface defects is low. In this steel group C, when electromagnetic stirring and electromagnetic braking were not applied, vertical cracking and remelting occurred when the hot water supply amount exceeded 4.3 t / min, and the probability of breakout became very high (Comparative Example). 27, 28).

この鋼種Ｃ群では、給湯量が３t／min未満の場合は電磁攪拌をかけることによって（実施例１７）、また給湯量が３t／min以上の場合は電磁ブレーキをかけることによって（実施例９〜１２，１８）、これらのブレークアウトは低減された。   In this steel type C group, when the hot water supply amount is less than 3 t / min, electromagnetic stirring is applied (Example 17), and when the hot water supply amount is 3 t / min or more, electromagnetic brakes are applied (Examples 9 to 9). 12, 18), these breakouts were reduced.

これらの結果のように、低炭素鋼の場合は、給湯量が４t／min以上のときに、極低炭素鋼の場合は、給湯量が５t／min以上のときに、亜包晶鋼の場合は、給湯量が３t／min以上のときに電磁ブレーキは大きな効果を有した。特に、不均一凝固や再溶解が発生しやすい亜包晶鋼では、電磁ブレーキは非常に大きな効果を有した。   As shown in these results, in the case of low carbon steel, when the amount of hot water supply is 4 t / min or more, in the case of extremely low carbon steel, when the amount of hot water supply is 5 t / min or more, in the case of hypoperitectic steel The electromagnetic brake had a great effect when the amount of hot water supply was 3 t / min or more. In particular, in the subperitectic steel that is prone to non-uniform solidification and remelting, the electromagnetic brake has a very large effect.

一方、上記鋼種において給湯量が上記値未満の場合は、電磁攪拌が大きな効果を有した。特に極低炭素鋼では、検査基準が高いこともあるが、表面疵の発生率が高く、電磁攪拌をかけることによって大きな効果が得られた。   On the other hand, when the amount of hot water supply was less than the above value in the above steel type, electromagnetic stirring had a great effect. In particular, ultra-low carbon steel has a high inspection standard, but the incidence of surface flaws is high, and a large effect was obtained by applying electromagnetic stirring.

本発明は上記した例に限らないことは勿論であり、各請求項に記載の技術的思想の範疇であれば、適宜実施の形態を変更しても良いことは言うまでもない。   It goes without saying that the present invention is not limited to the above-described examples, and the embodiments may be appropriately changed within the scope of the technical idea described in each claim.

例えば、交流電流は３相でなくても、電流位相差が９０度から１２０度であればそれ以上でも良い。   For example, the AC current may not be three-phase, but may be more as long as the current phase difference is 90 degrees to 120 degrees.

以上の本発明は、連続鋳造であれば、湾曲型、垂直型など、どのような方式の連続鋳造であっても適用できる。また、スラブの連続鋳造だけでなくブルームの連続鋳造にも適用できる。   The present invention described above can be applied to any type of continuous casting such as a curved type and a vertical type as long as it is continuous casting. Moreover, it can be applied not only to continuous casting of slabs but also to continuous casting of blooms.

本発明方法に使用する兼用コイルの形状を説明する図で、（ａ）は水平断面図、（ｂ）は垂直断面図である。It is a figure explaining the shape of the combined coil used for this invention method, (a) is a horizontal sectional view, (b) is a vertical sectional view. 一般的な連続鋳造法における鋳型内溶鋼の流動状態を模式的に示す縦断面図である。It is a longitudinal cross-sectional view which shows typically the flow state of the molten steel in a mold in a general continuous casting method.

符号の説明Explanation of symbols

１ 浸漬ノズル
２ 溶鋼
３ 鋳型
３ａ 短辺
３ｂ 長辺
５ 兼用コイル
５ａ ティース部
５ｂ 内側巻き線
５ｃ 外側巻き線
５ｄ コア
DESCRIPTION OF SYMBOLS 1 Immersion nozzle 2 Molten steel 3 Mold 3a Short side 3b Long side 5 Coil 5a Teeth part 5b Inner winding 5c Outer winding 5d Core

Claims (3)

２個の磁極鉄芯と、この磁極鉄芯のそれぞれの外周部に巻き回した２個のコイルと、２個の磁極鉄芯を合わせた外周部に巻き回した１個のコイルを有する電磁コイルを、鋳型長辺の外周に、各長辺で同じ個数で、鋳型長辺の外周合計で（２ｎ＋２）個（ｎは自然数）配置し、
鋳型内溶鋼を電磁攪拌する際には、全ての前記電磁コイルにおける各コイルに、電流位相差が９０度から１２０度の３相以上の多相交流電流を通電し、
鋳型内溶鋼に電磁ブレーキを付与する際には、前記各電磁コイル当たり、前記２個の磁極鉄芯を合わせた外周部に巻き回された１個の前記コイルに直流電流を通電するか、またはこれら３個のコイルに直流電流を通電して鋼を連続鋳造する方法であって、
鋳型に供給する前記溶鋼の成分炭素濃度が、
質量％で、０．０７％以上、０．１６％以下である場合は、
給湯量が３t／min未満では、鋳型内の溶鋼に電磁攪拌を作用させるべく印加し、
給湯量が３t／min以上では、鋳型内の溶鋼に電磁ブレーキを作用させるべく印加することを特徴とする連続鋳造方法。 Electromagnetic coil having two magnetic pole iron cores, two coils wound around the outer periphery of each of the magnetic pole iron cores, and one coil wound around the outer periphery of the two magnetic pole iron cores Are arranged on the outer periphery of the long side of the mold in the same number on each long side, and the total perimeter of the long side of the mold is (2n + 2) (n is a natural number),
When electromagnetically stirring molten steel in a mold, a multiphase alternating current of three or more phases with a current phase difference of 90 to 120 degrees is passed through each coil in all the electromagnetic coils,
When applying an electromagnetic brake to the molten steel in the mold, a direct current is applied to one of the coils wound around the outer periphery of the two magnetic pole cores for each electromagnetic coil, or A method of continuously casting steel by passing a direct current through these three coils,
The component carbon concentration of the molten steel supplied to the mold is
When it is 0.07% or more and 0.16% or less in mass%,
When the amount of hot water supply is less than 3 t / min, it is applied to make electromagnetic stirring act on the molten steel in the mold,
When the amount of hot water supply is 3 t / min or more, the continuous casting method is characterized in that an electromagnetic brake is applied to the molten steel in the mold . ２個の磁極鉄芯と、この磁極鉄芯のそれぞれの外周部に巻き回した２個のコイルと、２個の磁極鉄芯を合わせた外周部に巻き回した１個のコイルを有する電磁コイルを、鋳型長辺の外周に、各長辺で同じ個数で、鋳型長辺の外周合計で（２ｎ＋２）個（ｎは自然数）配置し、
鋳型内溶鋼を電磁攪拌する際には、全ての前記電磁コイルにおける各コイルに、電流位相差が９０度から１２０度の３相以上の多相交流電流を通電し、
鋳型内溶鋼に電磁ブレーキを付与する際には、前記各電磁コイル当たり、前記２個の磁極鉄芯を合わせた外周部に巻き回された１個の前記コイルに直流電流を通電するか、またはこれら３個のコイルに直流電流を通電して鋼を連続鋳造する方法であって、
鋳型に供給する前記溶鋼の成分炭素濃度が、
質量％で、０．００５０％を超え、０．０７％未満である場合は、
給湯量が４t／min未満では、鋳型内の溶鋼に電磁攪拌を作用させるべく印加し、
給湯量が４t／min以上では、鋳型内の溶鋼に電磁ブレーキを作用させるべく印加することを特徴とする連続鋳造方法。 Electromagnetic coil having two magnetic pole iron cores, two coils wound around the outer periphery of each of the magnetic pole iron cores, and one coil wound around the outer periphery of the two magnetic pole iron cores Are arranged on the outer periphery of the long side of the mold in the same number on each long side, and the total perimeter of the long side of the mold is (2n + 2) (n is a natural number),
When electromagnetically stirring molten steel in a mold, a multiphase alternating current of three or more phases with a current phase difference of 90 to 120 degrees is passed through each coil in all the electromagnetic coils,
When applying an electromagnetic brake to the molten steel in the mold, a direct current is applied to one of the coils wound around the outer periphery of the two magnetic pole cores for each electromagnetic coil, or A method of continuously casting steel by passing a direct current through these three coils,
The component carbon concentration of the molten steel supplied to the mold is
If it is more than 0.0050 % and less than 0.07 % by mass%,
If the amount of hot water supply is less than 4 t / min, it is applied to cause electromagnetic stirring to act on the molten steel in the mold,
The hot water supply amount is 4 t / min or more, continuous casting how to and applying to the action of the electromagnetic brake molten steel in the mold. ２個の磁極鉄芯と、この磁極鉄芯のそれぞれの外周部に巻き回した２個のコイルと、２個の磁極鉄芯を合わせた外周部に巻き回した１個のコイルを有する電磁コイルを、鋳型長辺の外周に、各長辺で同じ個数で、鋳型長辺の外周合計で（２ｎ＋２）個（ｎは自然数）配置し、
鋳型内溶鋼を電磁攪拌する際には、全ての前記電磁コイルにおける各コイルに、電流位相差が９０度から１２０度の３相以上の多相交流電流を通電し、
鋳型内溶鋼に電磁ブレーキを付与する際には、前記各電磁コイル当たり、前記２個の磁極鉄芯を合わせた外周部に巻き回された１個の前記コイルに直流電流を通電するか、またはこれら３個のコイルに直流電流を通電して鋼を連続鋳造する方法であって、
鋳型に供給する前記溶鋼の成分炭素濃度が、
質量％で、０．００５０％以下である場合は、
給湯量が５t／min未満では、鋳型内の溶鋼に電磁攪拌を作用させるべく印加し、
給湯量が５t／min以上では、鋳型内の溶鋼に電磁ブレーキを作用させるべく印加することを特徴とする連続鋳造方法。 Electromagnetic coil having two magnetic pole iron cores, two coils wound around the outer periphery of each of the magnetic pole iron cores, and one coil wound around the outer periphery of the two magnetic pole iron cores Are arranged on the outer periphery of the long side of the mold in the same number on each long side, and the total perimeter of the long side of the mold is (2n + 2) (n is a natural number),
When electromagnetically stirring molten steel in a mold, a multiphase alternating current of three or more phases with a current phase difference of 90 to 120 degrees is passed through each coil in all the electromagnetic coils,
When applying an electromagnetic brake to the molten steel in the mold, a direct current is applied to one of the coils wound around the outer periphery of the two magnetic pole cores for each electromagnetic coil, or A method of continuously casting steel by passing a direct current through these three coils,
The component carbon concentration of the molten steel supplied to the mold is
If it is less than 0.0050% by mass%,
When the amount of hot water supply is less than 5 t / min, it is applied to cause electromagnetic stirring to act on the molten steel in the mold,
The hot water amount 5 t / min or more, continuous casting how to and applying to the action of the electromagnetic brake molten steel in the mold.
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