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JP5198501B2 - Continuous casting nozzle - Google Patents
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JP5198501B2 - Continuous casting nozzle - Google Patents

Continuous casting nozzle Download PDF

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Publication number
JP5198501B2
JP5198501B2 JP2010069064A JP2010069064A JP5198501B2 JP 5198501 B2 JP5198501 B2 JP 5198501B2 JP 2010069064 A JP2010069064 A JP 2010069064A JP 2010069064 A JP2010069064 A JP 2010069064A JP 5198501 B2 JP5198501 B2 JP 5198501B2
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nozzle
inner hole
grooves
continuous casting
antioxidant
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JP2011200891A (en
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智玲 山内
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Akechi Ceramics Co Ltd
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Akechi Ceramics Co Ltd
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Description

本発明は、タンディッシュからモールドに溶鋼を注入する浸漬ノズル、ロングノズル、タンディッシュ上ノズル等の連続鋳造に用いられるノズルに関するものである。   The present invention relates to a nozzle used for continuous casting such as an immersion nozzle, a long nozzle, and a tundish upper nozzle for injecting molten steel from a tundish into a mold.

従来より、連続鋳造用ノズルには、溶鋼との接触面であるノズル内孔の内孔面に酸化防止剤を塗布してガラス化させ酸化防止被膜を形成することが行われている。   2. Description of the Related Art Conventionally, for a continuous casting nozzle, an antioxidant coating is formed by applying an antioxidant to the inner hole surface of the nozzle inner hole, which is a contact surface with molten steel, and vitrifying it.

しかし、この酸化防止被膜は、溶鋼注入前の予熱時や溶鋼の注入初期などに、部分的な膨れ、縮み、剥がれ等が生じて流出し易く、その結果、ノズル内孔の内孔面に酸化層が生じて鋳造時に溶損が発生するという問題点があった。
特開平10−277713号公報
However, this anti-oxidation coating tends to flow out due to partial swelling, shrinkage, peeling, etc. during preheating before molten steel injection or at the initial stage of molten steel injection, and as a result, oxidation occurs on the inner surface of the nozzle bore. There was a problem that a layer was formed and melting damage occurred during casting.
Japanese Patent Laid-Open No. 10-277713

本発明は上記問題点を解決するためになされたものであり、すなわち、本発明の課題は、ノズル内孔の内孔面に対する酸化防止剤の結合性を増大させ、酸化防止被膜に部分的な膨れ、縮み、剥がれ等が発生することを防止した連続鋳造用ノズルを提供することにある。   The present invention has been made to solve the above-mentioned problems. That is, the object of the present invention is to increase the binding property of the antioxidant to the inner surface of the nozzle inner hole and to partially apply the antioxidant coating. An object of the present invention is to provide a continuous casting nozzle that prevents swelling, shrinking, peeling, and the like from occurring.

上記課題を解決するものは、ノズル本体と、該ノズル本体内を貫通して形成され溶鋼が流通するためのノズル内孔とを有し、該ノズル内孔の内孔面には互いに交差して格子状となる溝が形成され、該溝には酸化防止剤が塗布され浸入していることを特徴とする連続鋳造用ノズルである。 What solves the said subject has a nozzle main body and the nozzle inner hole which penetrates the inside of this nozzle main body, and a molten steel distribute | circulates, and the inner hole surface of this nozzle inner hole mutually cross | intersects The continuous casting nozzle is characterized in that a grid-like groove is formed, and an antioxidant is applied and infiltrated into the groove .

前記格子状の溝は、少なくとも前記ノズル内孔の内孔面の総面積の50%以上に亘って形成されていることが好ましい。前記格子状の溝の深さおよび溝幅は、0.05〜3.00mmであり、前記溝の形成密度は0.5本〜20本/cmであることが好ましい。 The grid-like grooves are preferably formed over at least 50% of the total area of the inner surface of the nozzle inner hole. The depth and width of the lattice-like grooves are preferably 0.05 to 3.00 mm, and the formation density of the grooves is preferably 0.5 to 20 / cm 2 .

請求項1に記載した連続鋳造用ノズルによれば、ノズル内孔の内孔面に互いに交差して格子状となる溝を形成したため、ノズル内孔の内孔面に対する酸化防止剤の結合性が増して、酸化防止被膜の部分的な膨れ、縮み、剥がれ等の不具合の発生が防止される。   According to the continuous casting nozzle described in claim 1, since the grooves in the lattice shape are formed so as to intersect with each other on the inner hole surface of the nozzle inner hole, the binding property of the antioxidant to the inner hole surface of the nozzle inner hole is improved. In addition, the occurrence of problems such as partial swelling, shrinkage, and peeling of the antioxidant coating is prevented.

本発明の連続鋳造用ノズルの一実施例の縦断面図である。It is a longitudinal cross-sectional view of one Example of the nozzle for continuous casting of this invention. 図1に示した連続鋳造用ノズルの作用を説明するための一部断面図である。It is a partial cross section figure for demonstrating an effect | action of the nozzle for continuous casting shown in FIG.

本発明では、ノズル内孔3の内孔面3aに、互いに交差して格子状となる溝4を形成したため、塗布した酸化防止剤が溝4内に入り込み、内孔面3aとの接触面積が増加し、ノズル内孔3の内孔面3aに対する酸化防止剤の結合性が増大して、特に予熱時や溶鋼の初期注入時において、酸化防止被膜に部分的な膨れ、縮み、剥がれ等が発生することを防止した連続鋳造用ノズル1を実現した。   In the present invention, the grooves 4 are formed in the inner hole surface 3a of the nozzle inner hole 3 so as to intersect with each other to form a lattice shape. Therefore, the applied antioxidant enters the groove 4, and the contact area with the inner hole surface 3a is reduced. Increased, the binding property of the antioxidant to the inner surface 3a of the nozzle inner hole 3 is increased, and particularly during preheating or initial injection of molten steel, partial swelling, shrinkage, peeling, etc. occur in the antioxidant coating. The nozzle 1 for continuous casting which prevented it doing was implement | achieved.

本発明の連続鋳造用ノズルを図1または図2に示した一実施例を用いて説明する。
この実施例の連続鋳造用ノズル1は、図1に示すように、ノズル本体2と、ノズル本体2内を貫通して形成され溶鋼が流通するためのノズル内孔3とを有し、ノズル内孔3の内孔面3aには、互いに交差して格子状となる溝4が形成されている。以下、各構成について順次詳述する。
The continuous casting nozzle of the present invention will be described with reference to one embodiment shown in FIG. 1 or FIG.
As shown in FIG. 1, the continuous casting nozzle 1 of this embodiment has a nozzle body 2 and a nozzle inner hole 3 that is formed through the nozzle body 2 and through which molten steel flows. Grooves 4 are formed on the inner hole surface 3a of the hole 3 so as to intersect with each other to form a lattice shape. Hereinafter, each configuration will be described in detail.

ノズル本体2は、黒鉛等や有機樹脂等の炭素含有原料と様々な酸化物を組み合わせて形成した耐火物により構成されており、略円筒体で、その上部には上方に向かって徐々に拡径した首部が一体成形されている。   The nozzle body 2 is composed of a refractory material formed by combining various oxides with carbon-containing raw materials such as graphite and organic resin, and is a substantially cylindrical body with a diameter gradually increasing upward. The neck that has been made is integrally molded.

ノズル本体2の中心部には、溶鋼が流れるノズル内孔3がノズル本体2の上端から下端まで貫通して形成されている。具体的には、ノズル内孔3は、上部においては略円錐状に上方に向かって拡径し上端開口に連通しており、下部においては吐出口5に連通している。   A nozzle inner hole 3 through which molten steel flows is formed at the center of the nozzle body 2 so as to penetrate from the upper end to the lower end of the nozzle body 2. Specifically, the nozzle inner hole 3 expands upward in a substantially conical shape at the upper part and communicates with the upper end opening, and communicates with the discharge port 5 at the lower part.

そして、このノズル内孔3の内孔面3aには、互いに交差して格子状となる溝4が形成されている。具体的には、この実施例では、ノズル内孔3を形成する内孔面3aのうち、上部の拡径部以外に、ノズル本体2の長手方向に対して斜め方向に向かって形成された溝が互いに交差して格子状となるように溝4が形成されている。ただし、拡径部の表面にも格子状の溝が形成されたものも本発明の範疇に包含される。   In the inner hole surface 3a of the nozzle inner hole 3, grooves 4 are formed so as to intersect with each other in a lattice shape. Specifically, in this embodiment, a groove formed in an oblique direction with respect to the longitudinal direction of the nozzle body 2 in addition to the upper diameter enlarged portion of the inner hole surface 3a forming the nozzle inner hole 3. The grooves 4 are formed so as to cross each other in a lattice shape. However, those in which lattice-like grooves are formed on the surface of the enlarged diameter portion are also included in the scope of the present invention.

なお、内孔面3aのうち、縮径部の表面ほど酸化防止被膜が剥離し易いため、図1に示すような縮径部の表面には格子状の溝4が形成されていることか好ましい。   In addition, it is preferable that the groove | channel 4 of the grid | lattice shape is formed in the surface of a reduced diameter part as shown in FIG. .

格子状の溝4は、ノズル内孔3の内孔面3aの総面積の50%以上に亘って形成されていることが好ましい。
これによって、酸化防止被膜の部分的な膨れ、縮み、剥がれ等を抑制する格子状溝4の実効性を担保することができる。
The lattice-like grooves 4 are preferably formed over 50% or more of the total area of the inner hole surface 3 a of the nozzle inner hole 3.
As a result, the effectiveness of the grid-like grooves 4 that suppress partial swelling, shrinkage, peeling, etc. of the antioxidant coating can be ensured.

格子状の溝4の深さおよび溝幅は、0.05mm〜3.00mmであることが好ましく、溝4の形成密度は0.5本〜20本/cmであることが好ましい。
これにより、酸化防止剤の塗布作業が容易となるとともに、鋳造時の溶鋼流に影響を与えることのない溝4を形成できる。
The depth and width of the lattice-like grooves 4 are preferably 0.05 mm to 3.00 mm, and the formation density of the grooves 4 is preferably 0.5 to 20 / cm 2 .
Thereby, the application | coating operation | work of antioxidant becomes easy and the groove | channel 4 which does not affect the molten steel flow at the time of casting can be formed.

格子状の溝4の深さおよび溝幅が0.05mm未満であると、酸化防止剤の皮膜形成に効果がなく、3.00mmを超えると耐火物表面の凹凸が大きくなりすぎて、鋳造中にアルミナや溶鋼成分の付着、堆積が進行する。   If the depth and width of the grid-like grooves 4 are less than 0.05 mm, there is no effect in forming a film of the antioxidant, and if it exceeds 3.00 mm, the unevenness of the surface of the refractory becomes too large and casting is in progress. In addition, adhesion and deposition of alumina and molten steel components proceed.

他方、溝4の形成密度が0.5本/cm未満であると、酸化防止剤の皮膜形成に効果がなく、20本/cmを超えると耐火物表面の面粗度が低下しすぎ、鋳造中にアルミナや溶鋼成分の付着、堆積が進行する。 On the other hand, when the formation density of the grooves 4 is less than 0.5 / cm 2 , there is no effect in forming the antioxidant film, and when it exceeds 20 / cm 2 , the surface roughness of the refractory surface is too low. During the casting, adhesion and deposition of alumina and molten steel components proceed.

なお、格子状の溝4の深さおよび溝幅は、より好ましくは0.1mm〜2.00mmであり、溝4の形成密度はより好ましくは1.0本〜10本/cmである。 The depth and width of the lattice-like grooves 4 are more preferably 0.1 mm to 2.00 mm, and the formation density of the grooves 4 is more preferably 1.0 to 10 / cm 2 .

格子状の溝4の形成方法としては、ノズル本体2の成形時に形成する方法が好ましく、具体的には、ノズル本体2の外形を形成するための雌型金型内に、ノズル内孔3を形成するための雄型金型を配する際に、雄型金型の表面にネットを被せる、或いは雄型金型の表面にネット状帯状体を巻回した後、ノズル本体2を成形することにより、内孔面3aに格子状の溝4を容易に形成することができる。   As a method for forming the lattice-shaped grooves 4, a method of forming the nozzle body 2 at the time of molding is preferable. Specifically, the nozzle inner hole 3 is formed in a female mold for forming the outer shape of the nozzle body 2. When the male mold for forming is arranged, the nozzle body 2 is molded after the net is put on the surface of the male mold or the net-like band is wound around the surface of the male mold. Thus, the lattice-like grooves 4 can be easily formed in the inner hole surface 3a.

このように形成された格子状の溝4に酸化防止剤6を塗布すると、図2に示すように酸化防止剤6が溝4内に入するため、ノズル内孔3の内孔面3aに対する酸化防止剤の結合性が増して、酸化防止被膜の部分的な膨れ、縮み、剥がれ等の不具合の発生が防止され、特に予熱時や溶鋼の初期注入時に、酸化防止被膜が流出しない連続鋳造用ノズル1を構成できる。 When applied thus formed lattice antioxidant 6 in the groove 4, antioxidants 6 as shown in FIG. 2 for entering immersion in the groove 4, with the inner bore surface 3a of the nozzle bore 3 For the continuous casting that prevents the antioxidant coating from flowing out, especially during preheating or the initial injection of molten steel, by preventing the occurrence of defects such as partial swelling, shrinkage, and peeling of the antioxidant coating by increasing the binding properties of the antioxidant. The nozzle 1 can be configured.

1 連続鋳造用ノズル
2 ノズル本体
3 ノズル内孔
3a 内孔面
4 格子状となる溝
5 吐出口
6 酸化防止被膜
DESCRIPTION OF SYMBOLS 1 Nozzle for continuous casting 2 Nozzle main body 3 Nozzle inner hole 3a Inner hole surface 4 Groove | lattice-shaped groove 5 Discharge port 6 Antioxidation coating

Claims (1)

ノズル本体と、該ノズル本体内を貫通して形成され溶鋼が流通するためのノズル内孔とを有し、該ノズル内孔の内孔面には互いに交差して格子状となる溝が形成され、該溝には酸化防止剤が塗布され浸入していることを特徴とする連続鋳造用ノズル。 The nozzle body has a nozzle inner hole formed through the nozzle body and through which molten steel flows. Grooves that cross each other in a lattice shape are formed on the inner hole surface of the nozzle inner hole. The continuous casting nozzle is characterized in that an antioxidant is applied and infiltrated into the groove .
JP2010069064A 2010-03-25 2010-03-25 Continuous casting nozzle Expired - Fee Related JP5198501B2 (en)

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Application Number Priority Date Filing Date Title
JP2010069064A JP5198501B2 (en) 2010-03-25 2010-03-25 Continuous casting nozzle

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JP2011200891A JP2011200891A (en) 2011-10-13
JP5198501B2 true JP5198501B2 (en) 2013-05-15

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5230222A (en) * 1975-09-02 1977-03-07 Kubota Ltd Metal frame for centrifugal casting
JPH0515408Y2 (en) * 1987-11-30 1993-04-22
JPH05318060A (en) * 1992-05-13 1993-12-03 Nippon Steel Corp Molten metal supply nozzle for continuous casting
JP3363083B2 (en) * 1997-12-17 2003-01-07 住友大阪セメント株式会社 Transparent substrate and method for producing the same
JP2002153970A (en) * 2000-11-22 2002-05-28 Shinagawa Refract Co Ltd Multi-layer structural molten metal pouring nozzle

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