JP2007136521A - Immersion nozzle and continuous casting method - Google Patents

Immersion nozzle and continuous casting method Download PDF

Info

Publication number
JP2007136521A
JP2007136521A JP2005335923A JP2005335923A JP2007136521A JP 2007136521 A JP2007136521 A JP 2007136521A JP 2005335923 A JP2005335923 A JP 2005335923A JP 2005335923 A JP2005335923 A JP 2005335923A JP 2007136521 A JP2007136521 A JP 2007136521A
Authority
JP
Japan
Prior art keywords
immersion nozzle
sio
mass
sio2
tundish
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2005335923A
Other languages
Japanese (ja)
Other versions
JP4746412B2 (en
Inventor
Satoshi Ito
智 伊藤
Masaharu Sato
正治 佐藤
Taijiro Matsui
泰次郎 松井
Shinichi Fukunaga
新一 福永
Minero Niitsuma
峰郎 新妻
Tomohide Takeuchi
友英 竹内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP2005335923A priority Critical patent/JP4746412B2/en
Publication of JP2007136521A publication Critical patent/JP2007136521A/en
Application granted granted Critical
Publication of JP4746412B2 publication Critical patent/JP4746412B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an immersion nozzle capable of preventing adhesion of alumina. <P>SOLUTION: The immersion nozzle is preheated by high frequency induction heating. The immersion nozzle contains Al<SB>2</SB>O<SB>3</SB>as a main component, and contains FC (free carbon) and SiO<SB>2</SB>, which satisfy the following two formulae: 0 mass%<M<SB>FC</SB>≤(4/15)M<SB>SiO2</SB>+23 mass%; M<SB>SiO2</SB><25 mass%. By this composition, the amounts of FC and SiO<SB>2</SB>are decreased, so that the adhesion of alumina to the immersion nozzle is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、浸漬ノズルおよび連続鋳造方法に関する。   The present invention relates to an immersion nozzle and a continuous casting method.

連続鋳造機１０の鋳造工程においては、図３に示すように取鍋１１からの流れの乱れを整えたり、各鋳型への溶鋼分配などのため、溶融金属（溶鋼）を一度タンディッシュ１２に溜める。取鍋１１からタンディッシュ１２に溶鋼を流し込むときに溶鋼が大気に触れると酸化汚染が発生するため、取鍋１１の底部に取り付けられたロングノズル１３を介して溶鋼がタンディッシュ１２に供給される。
タンディッシュ１２で整流化された溶鋼は、安定した溶鋼流を得るために底部に取り付けられた浸漬ノズル１４を介して、モールド（水冷鋳型）１５に注入され、冷却されながら下方に引抜かれて連続的に鋳造される。 In the casting process of the continuous casting machine 10, as shown in FIG. 3, molten metal (molten steel) is once accumulated in the tundish 12 for adjusting the turbulence of the flow from the ladle 11 or distributing molten steel to each mold. . When molten steel is poured into the tundish 12 from the ladle 11 and the molten steel comes into contact with the atmosphere, oxidation contamination occurs. Therefore, the molten steel is supplied to the tundish 12 through the long nozzle 13 attached to the bottom of the ladle 11. .
The molten steel rectified by the tundish 12 is poured into a mold (water-cooled mold) 15 through a dipping nozzle 14 attached to the bottom to obtain a stable molten steel flow, and is continuously drawn by being drawn downward while being cooled. Cast.

ここで、溶鋼をタンディッシュ１２に流し込む際にタンディッシュ１２および浸漬ノズル１４の温度が低いと、浸漬ノズルの割れや閉塞が起こったり、介在物が十分に浮上しないことによる鋳片の品質不良が発生する場合がある。
そこで、浸漬ノズル１４は例えば１１００℃以上に予め予熱して用いられる。
例えば、図４に示されるように、バーナー１６によって浸漬ノズル１４を加熱したり、浸漬ノズル１４の外周を電熱器で囲んで加熱する方法が知られている（例えば、特許文献１参照）。 Here, when the temperature of the tundish 12 and the immersion nozzle 14 is low when the molten steel is poured into the tundish 12, the immersion nozzle is cracked or clogged, and the quality of the slab is deteriorated due to the inclusions not sufficiently floating. May occur.
Accordingly, the immersion nozzle 14 is preheated to, for example, 1100 ° C. or higher.
For example, as shown in FIG. 4, a method of heating the immersion nozzle 14 with a burner 16 or surrounding the outer periphery of the immersion nozzle 14 with an electric heater is known (for example, see Patent Document 1).

しかしながら、バーナー１６や電熱器で浸漬ノズル１４を加熱すると、全体を均一に加熱できるわけではないため、浸漬ノズル１４の各部で温度差が生じる。この温度差によって浸漬ノズル１４の各部で膨張量が異なると、浸漬ノズル１４が破損するという問題が生じる。そこで、従来は、アルミナベースで浸漬ノズル１４を形成したうえで、温度差に関わりなく全体の膨張量を略均一とするためにＣやＳｉＯ２を含有させている。
これにより、浸漬ノズル１４を１１００℃〜１２００℃程度に加熱する場合に浸漬ノズル内における最大温度差が５００℃〜６００℃程度あったとしても各部の膨張量が略均一となり、割れ等の不都合が生じることを防止できる。 However, when the immersion nozzle 14 is heated by the burner 16 or the electric heater, the whole cannot be heated uniformly, and thus a temperature difference occurs in each part of the immersion nozzle 14. If the expansion amount differs in each part of the immersion nozzle 14 due to this temperature difference, there arises a problem that the immersion nozzle 14 is damaged. Therefore, conventionally, after the immersion nozzle 14 is formed of an alumina base, C or SiO 2 is contained in order to make the entire expansion amount substantially uniform regardless of the temperature difference.
Accordingly, when the immersion nozzle 14 is heated to about 1100 ° C. to 1200 ° C., even if the maximum temperature difference in the immersion nozzle is about 500 ° C. to 600 ° C., the expansion amount of each part becomes substantially uniform, and there is a problem such as cracking. It can be prevented from occurring.

特開平１０−１１８７４６号公報Japanese Patent Laid-Open No. 10-118746

しかしながら、上記のように全体の膨張量を略均一とするために浸漬ノズル１４にＣやＳｉＯ２を含有させると、浸漬ノズル材質と溶鋼成分とが化学反応して生じる生成物が浸漬ノズル１４の孔に付着し、鋳造作業への支障や鋼品質への悪影響が問題となる。例えば、浸漬ノズルからの吐出流が偏流となったり、鋳造作業ができなくなるなどの問題が生じる。
具体的には、次の式により生成されるＡｌ２Ｏ３が浸漬ノズル１４の孔に付着するアルミナ付着が生じる。 However, when the immersion nozzle 14 contains C or SiO 2 in order to make the entire expansion amount substantially uniform as described above, the product produced by the chemical reaction between the immersion nozzle material and the molten steel component is the result of the immersion nozzle 14. Adhering to the holes causes problems in casting operations and adverse effects on steel quality. For example, there arises a problem that the discharge flow from the immersion nozzle becomes uneven flow or the casting operation cannot be performed.
Specifically, alumina adhesion occurs in which Al 2 O 3 produced by the following formula adheres to the hole of the immersion nozzle 14.

４Ａｌ＋３Ｃ（ｓ）＋３ＳｉＯ２（ｓ）
→Ａｌ２Ｏ３（ｓ）＋３Ｃ（ｓ）＋３Ｓｉ （式１） 4Al + 3C (s) + 3SiO 2 (s)
→ Al 2 O 3 (s) + 3C (s) + 3Si (Formula 1)

単純にアルミナ付着を防止することを考えれば、浸漬ノズル１４を生成する材料からＣやＳｉＯ２成分の含有量を少なくすればよいと考えられるが、予熱工程における膨張量の差による割れ等の問題を防止するには、ＣやＳｉＯ２成分の含有量を単純に少なくすることができず、アルミナ付着の問題を解消することができなかった。 Considering simply preventing the adhesion of alumina, it is considered that the content of the C and SiO 2 components should be reduced from the material for generating the immersion nozzle 14, but problems such as cracks due to the difference in expansion in the preheating process In order to prevent this, the content of the C and SiO 2 components could not be simply reduced, and the problem of alumina adhesion could not be solved.

本発明の目的は、アルミナ付着を防止できる浸漬ノズル、および、浸漬ノズルにアルミナ付着が生じずにかつ割れも生じない連続鋳造方法を提供することにある。   An object of the present invention is to provide an immersion nozzle capable of preventing alumina adhesion, and a continuous casting method in which alumina adhesion does not occur in the immersion nozzle and cracks do not occur.

本発明の浸漬ノズルは、高周波誘導加熱によって予熱される浸漬ノズルであって、Ａｌ２Ｏ３を主成分とし、ＦＣ（フリーカーボン）の含有量をＭＦＣ、ＳiＯ２の含有量をＭＳｉＯ２とするときに、次の２つの式を満たすＦＣおよびＳiＯ２を含有することを特徴とする。 Immersion nozzle of the present invention, there is provided a submerged nozzle which is preheated by high frequency induction heating, as a main component Al 2 O 3, FC M FC content of (free carbon), and the content of SiO 2 M SiO2 In this case, it is characterized by containing FC and SiO 2 satisfying the following two formulas.

０質量％＜ＭＦＣ≦（４／１５）ＭＳｉＯ２＋２３質量％
ＭＳｉＯ２＜２５質量％ 0% by mass <M FC ≦ (4/15) M SiO 2 + 23% by mass
M SiO2 <25% by mass

本発明では、前記ＭＳｉＯ２はゼロであってもよい。 In the present invention, the M SiO2 may be zero.

このような構成によれば、浸漬ノズルは高周波誘導加熱によって加熱されるので、例えば従来のごとくバーナーにて浸漬ノズルを加熱する場合に比べて浸漬ノズルの各部における温度差が小さく略均一に加熱される。よって、従来のごとく膨張量を制御するために含有されていたＦＣ（フリーカーボン）量およびＳiＯ２量を少なくすることができる。すると、上記（式１）による反応が抑制され、アルミナ付着を防止することができる。 According to such a configuration, since the immersion nozzle is heated by high frequency induction heating, for example, the temperature difference in each part of the immersion nozzle is small and substantially uniform compared to the case where the immersion nozzle is heated by a burner as in the past, for example. The Therefore, it is possible to reduce the amount of FC (free carbon) and the amount of SiO 2 that are contained in order to control the expansion amount as in the conventional case. Then, the reaction according to the above (Formula 1) is suppressed, and adhesion of alumina can be prevented.

本発明の浸漬ノズルは、高周波誘導加熱によって予熱される浸漬ノズルであって、孔の内壁を形成する内層と、前記内層の外側を形成する外層と、を有し、前記内層は、Ａｌ２Ｏ３を主成分とし、ＦＣ（フリーカーボン）の含有量をＭＦＣ、ＳiＯ２の含有量をＭＳｉＯ２とするときに、次の２つの式を満たすＦＣおよびＳiＯ２を含有することを特徴とする。
０質量％＜ＭＦＣ≦（４／１５）ＭＳｉＯ２＋２３質量％
ＭＳｉＯ２＜２５質量％
また、前記浸漬ノズルにあっては、前記ＭＳｉＯ２はゼロであってもよい。 The immersion nozzle of the present invention is an immersion nozzle that is preheated by high-frequency induction heating, and has an inner layer that forms an inner wall of a hole and an outer layer that forms the outside of the inner layer, and the inner layer is made of Al 2 O. 3 as a main component, the content of M FC of FC (free carbon), the content of SiO 2 when the M SiO2, characterized in that it contains the FC and SiO 2 to satisfy the following two equations .
0% by mass <M FC ≦ (4/15) M SiO 2 + 23% by mass
M SiO2 <25% by mass
In the immersion nozzle, the M SiO2 may be zero.

なお、外層を形成する成分としては、熱膨張が少ない成分とすることが好ましく、例えば、Ａｌ２Ｏ３を６０質量％〜７０質量％、ＳｉＯ２を１０質量％〜１５質量％、ＦＣを２０質量％以上とすることが例示される。 As the component forming the outer layer, it is preferable that the thermal expansion is less components, for example, the Al 2 O 3 60 wt% to 70 wt%, a SiO 2 10% by weight to 15% by weight, the FC 20 It is exemplified that the content is not less than mass%.

このような構成において、浸漬ノズルは、内層と外層とを有する複層で構成される。そして、内層を上記の範囲の成分によって形成することにより、上記発明と同様の作用効果を奏することができる。すなわち、上記（式１）による反応が抑制され、アルミナ付着を防止することができる。   In such a configuration, the immersion nozzle is composed of a multilayer having an inner layer and an outer layer. Then, by forming the inner layer with the components in the above range, the same effects as the above-described invention can be achieved. That is, the reaction according to the above (Formula 1) is suppressed, and adhesion of alumina can be prevented.

本発明の連続鋳造方法は、上記浸漬ノズルを高周波誘導加熱により予熱する予熱工程と、前記予熱工程にて予熱された前記浸漬ノズルを介してタンディッシュからモールドに溶鋼を流す鋳造工程と、を備えることを特徴とする。   The continuous casting method of the present invention includes a preheating step of preheating the immersion nozzle by high-frequency induction heating, and a casting step of flowing molten steel from the tundish to the mold through the immersion nozzle preheated in the preheating step. It is characterized by that.

このような構成によれば、上記発明と同様の作用効果を奏することができる。すなわち、予熱工程において浸漬ノズルを略均一に加熱することができるので、浸漬ノズルの成分のうち膨張量を制御するために含有されていたＦＣ（フリーカーボン）量およびＳｉＯ２量を少なくすることができる。したがって、アルミナ付着を防止することができる。
そして、アルミナ付着が防止されるので、浸漬ノズルの閉塞が防止される。
その結果、浸漬ノズルを介してモールドに安定して溶鋼を供給できる。 According to such a configuration, the same effects as those of the above-described invention can be achieved. That is, since the immersion nozzle can be heated substantially uniformly in the preheating step, the amount of FC (free carbon) and SiO 2 contained in the components of the immersion nozzle can be reduced in order to control the expansion amount. it can. Therefore, alumina adhesion can be prevented.
And since alumina adhesion is prevented, obstruction | occlusion of an immersion nozzle is prevented.
As a result, molten steel can be stably supplied to the mold through the immersion nozzle.

本発明によれば、従来のごとく膨張量を制御するために含有されていたＦＣ（フリーカーボン）量およびＳｉＯ２量を少なくすることができるので、アルミナ付着を防止することができる。 According to the present invention, the amount of FC (free carbon) and the amount of SiO 2 contained for controlling the amount of expansion as in the conventional case can be reduced, so that alumina adhesion can be prevented.

以下、本発明の実施の形態を図示するとともに図中の各要素に付した符号を参照して説明する。
（実施形態）
本発明の浸漬ノズルおよび連続鋳造方法にかかる実施形態について説明する。
表１は、本発明に係る浸漬ノズルの実施例の成分と従来例とを示す表である。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be illustrated and described with reference to reference numerals attached to respective elements in the drawings.
(Embodiment)
Embodiments according to the immersion nozzle and continuous casting method of the present invention will be described.
Table 1 is a table | surface which shows the component of the Example of the immersion nozzle which concerns on this invention, and a prior art example.

Figure 2007136521
Figure 2007136521

本発明の浸漬ノズルは、Ａｌ２Ｏ３を主成分とし、次の２つの式を満たすＦＣ（フリーカーボン）およびＳiＯ２を含有する。 The immersion nozzle of the present invention contains Al 2 O 3 as a main component and contains FC (free carbon) and SiO 2 satisfying the following two formulas.

０質量％＜ＭＦＣ≦（４／１５）ＭＳｉＯ２＋２３質量％ （式２） 0% by mass <M FC ≦ (4/15) M SiO 2 + 23% by mass (Formula 2)

ＭＳｉＯ２＜２５質量％ （式３） M SiO2 <25% by mass (Formula 3)

なお、ＭＦＣは含有されるＦＣ（フリーカーボン）量であり、ＭＳｉＯ２は含有されるＳiＯ２量である。
また、ＳiＯ２はゼロでもよい（ＭＳｉＯ２＝０）。 Incidentally, M FC is FC (free carbon) content contained, M SiO2 is SiO 2 content contained.
Further, SiO 2 may be zero (M SiO2 = 0).

つまり、本発明の浸漬ノズルが含有するＦＣ（フリーカーボン）およびＳｉＯ２は、図１のグラフにおいて、（式２）によって規定されるラインＡと（式３）によって規定されるラインＢとで囲まれる領域Ｓによって表される。
ただし、浸漬ノズルを高周波誘導加熱する都合上、ＦＣは含有されていなければならない。
なお、図１中においてプロットされている点は、従来用いられていた浸漬ノズルに含有されていたＦＣおよびＳｉＯ２の量を示す点である。 That is, FC (free carbon) and SiO 2 contained in the immersion nozzle of the present invention are surrounded by a line A defined by (Expression 2) and a line B defined by (Expression 3) in the graph of FIG. Represented by region S.
However, for the convenience of high-frequency induction heating of the immersion nozzle, FC must be contained.
Incidentally, points are plotted in the figure 1 is that indicative of the amount of FC and SiO 2, which was contained in the immersion nozzle has been used conventionally.

具体的に、本発明の実施例２、実施例５では、ＦＣおよびＡｌ２Ｏ３により形成され、成分比は、表１に示す通りである。
さらに、実施例１ではＳｉＯ２を含み、実施例３ではＳｉＣおよびＳｉＯ２を含み、実施例４ではＳｉＯ２を含む。各実施例の成分比は、表１に示す通りである。 Specifically, Examples 2 and 5 of the present invention are formed of FC and Al 2 O 3 , and the component ratios are as shown in Table 1.
Further, Example 1 includes SiO 2 , Example 3 includes SiC and SiO 2 , and Example 4 includes SiO 2 . The component ratio of each example is as shown in Table 1.

次に、浸漬ノズルの予熱方法について説明する。
本発明の浸漬ノズル１４にあっては、図２に示されるように、高周波誘導加熱によって浸漬ノズル１４を加熱する。
図２において、誘導コイル２０は、浸漬ノズル１４の外側に配置される外側コイル２１と、浸漬ノズル１４の内側に配置される内側コイル２２と、を備える。
ここで、外側コイル２１は浸漬ノズル１４の下端から上部の途中まで浸漬ノズル１４を囲んでいる。また、内側コイル２２は、外側コイル２１よりも上側に配置されている。そして、外側コイル２１および内側コイル２２にそれぞれ高周波電流を印加し、浸漬ノズル１４を誘導加熱する。
このような誘導コイル２０による誘導加熱によれば、外側コイル２１と内側コイル２２とが浸漬ノズル１４の下端から上端にまで誘導加熱を行うことができる。
さらに、外側コイル２１と内側コイル２２とへの印加電流の電流値を精密に制御することにより、浸漬ノズル全体を誘導加熱することができる。
例えば、浸漬ノズル１４を１１００℃以上に加熱する場合、従来のごとくバーナー１６（図４）で加熱する場合には５００℃〜６００℃の最大温度差が生じるが、高周波誘導加熱によれば最大温度差を３００℃程度にすることができる。 Next, a method for preheating the immersion nozzle will be described.
In the immersion nozzle 14 of the present invention, the immersion nozzle 14 is heated by high frequency induction heating as shown in FIG.
In FIG. 2, the induction coil 20 includes an outer coil 21 disposed outside the immersion nozzle 14 and an inner coil 22 disposed inside the immersion nozzle 14.
Here, the outer coil 21 surrounds the immersion nozzle 14 from the lower end of the immersion nozzle 14 to the middle of the upper part. Further, the inner coil 22 is disposed above the outer coil 21. Then, a high frequency current is applied to each of the outer coil 21 and the inner coil 22 to inductively heat the immersion nozzle 14.
According to such induction heating by the induction coil 20, the outer coil 21 and the inner coil 22 can perform induction heating from the lower end to the upper end of the immersion nozzle 14.
Furthermore, by accurately controlling the current value of the current applied to the outer coil 21 and the inner coil 22, the entire immersion nozzle can be induction heated.
For example, when the immersion nozzle 14 is heated to 1100 ° C. or higher, the maximum temperature difference of 500 ° C. to 600 ° C. is generated when the immersion nozzle 14 is heated by the burner 16 (FIG. 4) as in the prior art. The difference can be about 300 ° C.

実際の鋳造手順について説明する。
まず、タンディッシュ１２、ロングノズル１３および浸漬ノズルを予熱する。
このとき、タンディッシュ１２およびロングノズル１３は、２時間〜４時間かけて予熱し、タンディッシュ内温度は１２００℃以上となるようにする。
浸漬ノズル１４は、前述の高周波誘導加熱によって０．５時間〜２時間かけて１０００℃以上になるように予熱される。なお、浸漬ノズル１４は、タンディッシュ１２に組み付けられた状態で予熱されてもよく、タンディッシュ１２から外された状態で予熱されてもよい。 The actual casting procedure will be described.
First, the tundish 12, the long nozzle 13 and the immersion nozzle are preheated.
At this time, the tundish 12 and the long nozzle 13 are preheated over 2 to 4 hours so that the temperature in the tundish becomes 1200 ° C. or higher.
The immersion nozzle 14 is preheated so as to reach 1000 ° C. or more over 0.5 to 2 hours by the above-described high frequency induction heating. In addition, the immersion nozzle 14 may be preheated in the state assembled | attached to the tundish 12, and may be preheated in the state removed from the tundish 12.

溶鋼が入った取鍋１１が到着したところで、タンディッシュ１２、ロングノズル１３および浸漬ノズル１４の予熱を終了する。浸漬ノズル１４をタンディッシュ１２から外して予熱している場合には、浸漬ノズル１４をタンディッシュ１２に組み付ける。
タンディッシュ１２をモールド１５上に移動させ、さらに、ロングノズル１３を取鍋１１に取り付ける。
そして、取鍋１１からロングノズル１３を介してタンディッシュ１２に溶鋼を流し込み、タンディッシュ１２の質量が所定量になったところで流量調整機を開にして、浸漬ノズル１４からモールド１５に溶鋼を注入する。モールド１５の湯面レベルを維持しながら、鋳造が継続される。 When the ladle 11 containing molten steel arrives, preheating of the tundish 12, the long nozzle 13 and the immersion nozzle 14 is terminated. When the immersion nozzle 14 is removed from the tundish 12 and preheated, the immersion nozzle 14 is assembled to the tundish 12.
The tundish 12 is moved onto the mold 15, and the long nozzle 13 is attached to the pan 11.
Then, molten steel is poured into the tundish 12 from the ladle 11 through the long nozzle 13, and when the mass of the tundish 12 reaches a predetermined amount, the flow rate adjuster is opened and molten steel is injected from the immersion nozzle 14 into the mold 15. To do. Casting is continued while maintaining the hot water level of the mold 15.

（実験例）
次に、表１の従来例、実施例１〜５の成分で形成した浸漬ノズルを試験した結果について説明する。
実験方法としては、従来例、実施例１〜５の成分で形成した浸漬ノズルを実際に使用し、浸漬ノズルの吐出孔孔上端（溶鋼流入側）から５０ｍｍ地点におけるアルミナ付着厚みを測定した。鋳造時間は３００分であった。
実験結果より、従来例の場合にくらべて、実施例１〜５によれば、アルミナ付着の厚みをおよそ半分以下に抑えることができた。よって、本発明の効果が確認された。 (Experimental example)
Next, the result of having tested the immersion nozzle formed with the component of the prior art example of Table 1 and Examples 1-5 is demonstrated.
As an experimental method, the immersion nozzle formed with the components of the conventional example and Examples 1 to 5 was actually used, and the alumina adhesion thickness at a point of 50 mm from the upper end of the discharge hole of the immersion nozzle (the molten steel inflow side) was measured. The casting time was 300 minutes.
From the experimental results, according to Examples 1 to 5, compared to the conventional example, the thickness of the alumina adhesion could be suppressed to about half or less. Therefore, the effect of the present invention was confirmed.

なお、本発明は前述の実施例に限定されず、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれる。例えば、実施例１〜５の成分比に限定されず、図１の領域Ｓに入る成分組成であれば、本発明に含まれる。   In addition, this invention is not limited to the above-mentioned Example, The deformation | transformation, improvement, etc. in the range which can achieve the objective of this invention are included in this invention. For example, it is not limited to the component ratio of Examples 1-5, and if it is a component composition which enters the area | region S of FIG. 1, it is included in this invention.

本発明は、浸漬ノズルおよびこの浸漬ノズルを利用した連続鋳造方法に利用できる。   The present invention can be used for an immersion nozzle and a continuous casting method using the immersion nozzle.

本発明で利用できるＦＣ量とＳiＯ２量の範囲を示す図。It shows a range of FC amount and amount of SiO 2 which can be utilized in the present invention. 浸漬ノズルを高周波誘導加熱している状態を示す図。The figure which shows the state which is carrying out the high frequency induction heating of the immersion nozzle. 背景技術の説明において、連続鋳造機を示す図。The figure which shows a continuous casting machine in description of background art. 背景技術の説明において、浸漬ノズルを予熱する様子を示す図。The figure which shows a mode that an immersion nozzle is pre-heated in description of background art.

符号の説明Explanation of symbols

１０…連続鋳造機、１１…取鍋、１２…タンディッシュ、１３…ロングノズル、１４…浸漬ノズル、１５…モールド、１６…バーナー、２０…誘導コイル、２１…外側コイル、２２…内側コイル。 DESCRIPTION OF SYMBOLS 10 ... Continuous casting machine, 11 ... Ladle, 12 ... Tundish, 13 ... Long nozzle, 14 ... Immersion nozzle, 15 ... Mold, 16 ... Burner, 20 ... Induction coil, 21 ... Outer coil, 22 ... Inner coil

Claims (5)

高周波誘導加熱によって予熱される浸漬ノズルであって、
Ａｌ２Ｏ３を主成分とし、
ＦＣ（フリーカーボン）の含有量をＭＦＣ、ＳiＯ２の含有量をＭＳｉＯ２とするときに、次の２つの式を満たすＦＣおよびＳiＯ２を含有する
ことを特徴とする浸漬ノズル。
０質量％＜ＭＦＣ≦（４／１５）ＭＳｉＯ２＋２３質量％
ＭＳｉＯ２＜２５質量％ An immersion nozzle preheated by high frequency induction heating,
Al 2 O 3 as a main component,
FC immersion nozzle content M FC of (free carbon), the content of SiO 2 when the M SiO2, characterized in that it contains the FC and SiO 2 satisfy the following two equations.
0% by mass <M FC ≦ (4/15) M SiO 2 + 23% by mass
M SiO2 <25% by mass 請求項１に記載の浸漬ノズルにおいて、
前記ＭＳｉＯ２はゼロである
ことを特徴とする浸漬ノズル。 The immersion nozzle according to claim 1,
The M SiO2 is zero. 高周波誘導加熱によって予熱される浸漬ノズルであって、
孔の内壁を形成する内層と、前記内層の外側を形成する外層と、を有し、
前記内層は、Ａｌ２Ｏ３を主成分とし、
ＦＣ（フリーカーボン）の含有量をＭＦＣ、ＳｉＯ２の含有量をＭＳＩＯ２とするときに、次の２つの式を満たすＦＣおよびＳｉＯ２を含有する
ことを特徴とする浸漬ノズル。
０質量％＜ＭＦＣ≦（４／１５）ＭＳｉＯ２＋２３質量％
ＭＳｉＯ２＜２５質量％ An immersion nozzle preheated by high frequency induction heating,
An inner layer that forms an inner wall of the hole, and an outer layer that forms the outer side of the inner layer,
The inner layer is mainly composed of Al 2 O 3 ,
An immersion nozzle characterized by containing FC and SiO 2 satisfying the following two formulas when the content of FC (free carbon) is M FC and the content of SiO 2 is MSIO2 .
0% by mass <M FC ≦ (4/15) M SiO 2 + 23% by mass
M SiO2 <25% by mass 請求項３に記載の浸漬ノズルにおいて、
前記ＭＳｉＯ２はゼロである
ことを特徴とする浸漬ノズル。 The immersion nozzle according to claim 3,
The M SiO2 is zero. 請求項１から請求項４のいずれかに記載の浸漬ノズルを高周波誘導加熱により予熱する予熱工程と、
前記予熱工程にて予熱された前記浸漬ノズルを介してタンディッシュからモールドに溶鋼を流す鋳造工程と、を備える
ことを特徴とする連続鋳造方法。 A preheating step of preheating the immersion nozzle according to any one of claims 1 to 4 by high frequency induction heating;
And a casting step of flowing molten steel from the tundish to the mold through the immersion nozzle preheated in the preheating step.
JP2005335923A 2005-11-21 2005-11-21 Continuous casting method Active JP4746412B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005335923A JP4746412B2 (en) 2005-11-21 2005-11-21 Continuous casting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005335923A JP4746412B2 (en) 2005-11-21 2005-11-21 Continuous casting method

Publications (2)

Publication Number Publication Date
JP2007136521A true JP2007136521A (en) 2007-06-07
JP4746412B2 JP4746412B2 (en) 2011-08-10

Family

ID=38199998

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005335923A Active JP4746412B2 (en) 2005-11-21 2005-11-21 Continuous casting method

Country Status (1)

Country Link
JP (1) JP4746412B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009072217A1 (en) * 2007-12-05 2009-06-11 Nippon Steel Corporation Immersion nozzle and method of continuous casting
WO2009072216A1 (en) * 2007-12-05 2009-06-11 Nippon Steel Corporation Immersion nozzle and method of continuous casting
JP2020175405A (en) * 2019-04-16 2020-10-29 日本製鉄株式会社 Immersion nozzle preheating method
JP2020179412A (en) * 2019-04-25 2020-11-05 日本製鉄株式会社 Induction heater for immersion nozzle and method of pre-heating immersion nozzle

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4978632A (en) * 1972-12-04 1974-07-29
JPS55136169A (en) * 1979-04-12 1980-10-23 Nippon Crucible Co Electroconductive refractories
JPS63278665A (en) * 1987-05-07 1988-11-16 Nkk Corp Container for molten metal making nozzle heated
JPH03243257A (en) * 1990-02-20 1991-10-30 Kurosaki Refract Co Ltd Submerged nozzle for continuous casting
JPH06246409A (en) * 1993-02-25 1994-09-06 Leotec:Kk Heating type immersion nozzle device for discharging half-soldified metal
JPH10502579A (en) * 1995-04-28 1998-03-10 デイデイエル−ヴエルケ アクチエンゲゼルシヤフト Method for induction heating of refractory molded part and suitable molded part therefor
JP2001179406A (en) * 1999-12-27 2001-07-03 Nippon Steel Corp Nozzle for continuous casting and continuous casting method
JP2003126945A (en) * 2000-12-25 2003-05-08 Sumitomo Metal Ind Ltd Device for supplying molten steel for continuous casting and method for continuous casting using the same
JP2003260545A (en) * 2002-03-11 2003-09-16 Shinagawa Refract Co Ltd Refractory for fireproof member for continuous steel casting

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4978632A (en) * 1972-12-04 1974-07-29
JPS55136169A (en) * 1979-04-12 1980-10-23 Nippon Crucible Co Electroconductive refractories
JPS63278665A (en) * 1987-05-07 1988-11-16 Nkk Corp Container for molten metal making nozzle heated
JPH03243257A (en) * 1990-02-20 1991-10-30 Kurosaki Refract Co Ltd Submerged nozzle for continuous casting
JPH06246409A (en) * 1993-02-25 1994-09-06 Leotec:Kk Heating type immersion nozzle device for discharging half-soldified metal
JPH10502579A (en) * 1995-04-28 1998-03-10 デイデイエル−ヴエルケ アクチエンゲゼルシヤフト Method for induction heating of refractory molded part and suitable molded part therefor
JP2001179406A (en) * 1999-12-27 2001-07-03 Nippon Steel Corp Nozzle for continuous casting and continuous casting method
JP2003126945A (en) * 2000-12-25 2003-05-08 Sumitomo Metal Ind Ltd Device for supplying molten steel for continuous casting and method for continuous casting using the same
JP2003260545A (en) * 2002-03-11 2003-09-16 Shinagawa Refract Co Ltd Refractory for fireproof member for continuous steel casting

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009072217A1 (en) * 2007-12-05 2009-06-11 Nippon Steel Corporation Immersion nozzle and method of continuous casting
WO2009072216A1 (en) * 2007-12-05 2009-06-11 Nippon Steel Corporation Immersion nozzle and method of continuous casting
CN101888910B (en) * 2007-12-05 2012-12-19 新日本制铁株式会社 Immersion nozzle and method of continuous casting
CN101883647B (en) * 2007-12-05 2013-06-12 新日铁住金株式会社 Method of continuous casting
JP2020175405A (en) * 2019-04-16 2020-10-29 日本製鉄株式会社 Immersion nozzle preheating method
JP7234768B2 (en) 2019-04-16 2023-03-08 日本製鉄株式会社 Preheating method of immersion nozzle
JP2020179412A (en) * 2019-04-25 2020-11-05 日本製鉄株式会社 Induction heater for immersion nozzle and method of pre-heating immersion nozzle

Also Published As

Publication number Publication date
JP4746412B2 (en) 2011-08-10

Similar Documents

Publication Publication Date Title
JP5869747B2 (en) Method for producing an alloy casting having a protective layer
JP4746412B2 (en) Continuous casting method
JP7167646B2 (en) Method of adding alloy to molten steel
US20090145933A1 (en) Induction powered ladle bottom nozzle
JP5015053B2 (en) Method of preheating immersion nozzle for continuous casting and continuous casting method
JP6772677B2 (en) Tandish internal molten steel heating method and tundish plasma heating device
JP2008105042A (en) Method for preheating nozzle for pouring molten steel
JP6569554B2 (en) Thin-walled slab manufacturing method
JP6531625B2 (en) Method of manufacturing thin cast slab
JP3393829B2 (en) Immersion nozzle
JP2005297001A (en) Continuous casting method for steel
KR20200036533A (en) Mold for continuous casting and coating method of mold for continuous casting
WO2009072216A1 (en) Immersion nozzle and method of continuous casting
KR100738857B1 (en) Method for purposefully moderating of pouring spout and pouring spout for performing the same
JP7234768B2 (en) Preheating method of immersion nozzle
JP2019515797A (en) Mold flux and casting method using the same
JP4055522B2 (en) Molded copper plate for continuous casting mold and manufacturing method thereof
KR100239938B1 (en) Immersion nozzle for continuous casting
JPH09276996A (en) Method for preventing surface oxidation (deckel) at the time of starting reused tundish
JP7124617B2 (en) Scum weir, twin-roll continuous casting apparatus, and method for producing thin cast slab
CN109482829B (en) Crystallizer casting powder for prolonging service life of submerged nozzle
JP2017177130A (en) Gutter for high temperature fluid
JP2007326110A (en) Immersion nozzle and continuous casting method
JP2020179412A (en) Induction heater for immersion nozzle and method of pre-heating immersion nozzle
JP2024032616A (en) Molten steel coating powder

Legal Events

Date Code Title Description
RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20070703

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20070815

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080307

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20101214

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20101221

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110221

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20110510

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20110513

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140520

Year of fee payment: 3

R151 Written notification of patent or utility model registration

Ref document number: 4746412

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140520

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140520

Year of fee payment: 3

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140520

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350