JP2008194745A - Long nozzle - Google Patents

Long nozzle Download PDF

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Publication number
JP2008194745A
JP2008194745A JP2007035182A JP2007035182A JP2008194745A JP 2008194745 A JP2008194745 A JP 2008194745A JP 2007035182 A JP2007035182 A JP 2007035182A JP 2007035182 A JP2007035182 A JP 2007035182A JP 2008194745 A JP2008194745 A JP 2008194745A
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nozzle
inner hole
eroded
long nozzle
thermal shock
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JP4809259B2 (en
Inventor
Shigeaki Takahashi
成彰 高橋
Toshiyuki Muroi
利行 室井
Tomotama Yamauchi
智玲 山内
Kazuhisa Katsuki
和久 香月
Tomoichiro Yoshimitsu
友一郎 吉光
Hirobumi Tajima
博文 田嶋
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Akechi Ceramics Co Ltd
Nippon Steel Corp
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Akechi Ceramics Co Ltd
Nippon Steel Corp
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Publication of JP2008194745A publication Critical patent/JP2008194745A/en
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  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long nozzle capable of extending a usable life by fitting a refractory sleeve inside a nozzle inner hole body to achieve the continuous usage without replacing the nozzle body when the upper end of the nozzle inner hole body is eroded by thermal shock. <P>SOLUTION: The long nozzle 1 is formed in that the refractory sleeve 11 made of the same quality as the inner hole body 6 is fitted inside the inner hole body 6 eroded by the thermal shock accompanying casting, and is secured on the upper end opening 4 of the long nozzle 1 by a flange 13 integrally formed at the upper end to install the sleeve body 12 at the upper end of the inner periphery of the nozzle inner hole 3. The upper end of the nozzle inner hole 3 can newly form a contact surface of molten metal with no erosion. This dispenses with the replacement of the nozzle body with only upper end of the nozzle inner hole 3 eroded by the thermal shock upon casting, thereby enabling the continuous usage of the predetermined number of charges to extend the usable life to enhancing the economic efficiency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ノズル内孔に耐火物の内孔体を形成し、取鍋内の金属溶湯をタンディッシュに注入するロングノズルに関するものである。 The present invention relates to a long nozzle in which an inner hole body of a refractory is formed in a nozzle inner hole and a molten metal in a ladle is poured into a tundish.

鋼等の連続鋳造において、取鍋底部に配設されたスライディングノズルの開度等により、下ノズルからロングノズルに流出する金属溶湯は乱れ不均一な流れとなる。この不均一な流れにより、ロングノズルの内孔面の上端部が熱衝撃を受け部分的に浸食（孔明き）される場合がある。   In continuous casting of steel or the like, the molten metal flowing out from the lower nozzle to the long nozzle becomes a turbulent and non-uniform flow due to the opening degree of the sliding nozzle disposed at the bottom of the ladle. Due to this non-uniform flow, the upper end of the inner hole surface of the long nozzle may be partially eroded (perforated) due to thermal shock.

鋼等の連続鋳造に用いられるロングノズルとしては、特開２００５−１２５４０３号公報（特許文献１）、特開２００４−０７４１９８号公報（特許文献２）等に開示されている。特許文献１では、ロングノズルの内孔の溶鋼接触面にドロマイトクリンカーを含有する耐火物を内張りした内孔体を形成している。また、特許文献２では、金属溶湯の湯の流れを改善して、鋳片の品質を向上できるノズルとして、下端部のノズル吐出孔の開口より上方のノズル筒の左右の肉厚差が１．０ｍｍ以下とした連続鋳造用ノズルが開示されている。   As long nozzles used for continuous casting of steel or the like, JP-A-2005-125403 (Patent Document 1), JP-A-2004-074198 (Patent Document 2) and the like are disclosed. In Patent Document 1, an inner hole body in which a refractory containing dolomite clinker is lined is formed on the molten steel contact surface of the inner hole of a long nozzle. Moreover, in patent document 2, as a nozzle which can improve the flow of the molten metal and improve the quality of the slab, the difference in thickness between the right and left nozzle cylinders above the opening of the nozzle discharge hole at the lower end is 1. A continuous casting nozzle of 0 mm or less is disclosed.

しかしながら、上記特許文献１のものは、ドロマイトクリンカーを含有する耐火物による内孔体を形成することにより、地金や介在物が付着し難くなるという効果は期待できるが、不均一な金属溶湯による熱衝撃に対する抵抗力を備えているものではない。また、特許文献２のものは、不均一な金属溶湯による熱衝撃に対する抵抗力を備えているものではない。ロングノズルにおける金属溶湯の注入時の熱衝撃による浸食は、ノズル内孔の上端部に集中して中央部及び下端部に生じることは少なく、上端部が浸食されただけのノズル本体を交換することは不経済である。
特開２００５−１２５４０３号公報 特開２００４−０７４１９８号公報 However, although the thing of the said patent document 1 can anticipate the effect that a base metal and inclusions become difficult to adhere by forming the inner-pore body by the refractory containing a dolomite clinker, it is based on a non-uniform molten metal. It does not have resistance to thermal shock. Moreover, the thing of patent document 2 is not provided with the resistance power with respect to the thermal shock by a non-uniform molten metal. Erosion due to thermal shock at the time of pouring molten metal in the long nozzle is rarely concentrated at the upper end of the nozzle inner hole and occurs at the center and lower end, and the nozzle body whose upper end is only eroded should be replaced. Is uneconomical.
JP 2005-125403 A JP 2004-074198 A

本発明は、上記問題点を解決するためになされたもので、熱衝撃によりノズル内孔体の上端部が浸食された場合に、その内側に耐火物スリーブを嵌装することにより、ノズル本体を交換することなく使用継続を図り、耐用寿命を延長できるロングノズルを提供することを目的とする。   The present invention has been made to solve the above problems, and when the upper end portion of the nozzle inner hole body is eroded by thermal shock, a refractory sleeve is fitted inside the nozzle body, thereby The purpose is to provide a long nozzle that can continue to be used without replacement and extend its service life.

上記課題を解決するための請求項1に記載のロングノズルは、ノズル内孔に耐火物の内孔体を形成し、取鍋内の金属溶湯をタンディシュに注入するロングノズルにおいて、鋳造に伴う熱衝撃により浸食された前記内孔体の内側に、前記内孔体の材質と同一の材質で形成された耐火物スリーブを嵌装するとともに、該耐火物スリーブの上端部に一体形成したフランジを前記ロングノズルの上端開孔部に掛止して、ノズル内孔の上端部内周に前記耐火物スリーブを設置できるようにしたことを特徴とする。   The long nozzle according to claim 1 for solving the above-mentioned problem is a long nozzle in which an inner hole body of a refractory is formed in the nozzle inner hole and the molten metal in the ladle is poured into the tundish. A refractory sleeve made of the same material as that of the inner hole body is fitted inside the inner hole body eroded by impact, and a flange formed integrally with the upper end portion of the refractory sleeve is The refractory sleeve can be installed on the inner periphery of the upper end portion of the nozzle inner hole by hanging on the upper end opening portion of the long nozzle.

請求項１に記載したロングノズルによれば、鋳造に伴う熱衝撃により浸食された前記内孔体の内側に、該内孔体と同一の材質で形成された耐火物スリーブを嵌装し、上端部に一体形成したフランジをロングノズルの上端面に掛止して、ノズル内孔の内周の上端部に耐火物スリーブを設置するもので、ノズル内孔の上端部に新たに浸食のない金属溶湯の接触面を形成できるから、鋳込み時の熱衝撃によりノズル内孔の上端部が浸食されただけのノズル本体を交換することなく、所定チャージ数の継続使用が可能となり、耐用寿命が延長できて経済性を高めることができる。   According to the long nozzle described in claim 1, a refractory sleeve formed of the same material as the inner hole body is fitted inside the inner hole body eroded by thermal shock accompanying casting, and the upper end A flange that is integrally formed with the nozzle is hooked to the upper end surface of the long nozzle, and a refractory sleeve is installed at the upper end of the inner periphery of the nozzle inner hole. Since the contact surface of the molten metal can be formed, it is possible to continue using the specified number of charges without replacing the nozzle body where the upper end of the nozzle bore is eroded due to thermal shock during casting, and the service life can be extended. Can improve economy.

本発明の実施例について添付図面を参照して説明する。図１は、本実施例に係るロングノズル１の上端部の断面図、図２は耐火物スリーブ１１の断面図、図３はロングノズル１に耐火物スリーブ１１を嵌装した状態の断面図である。ロングノズル１は、ノズル本体２の軸中心にノズル内孔３が貫通している。ノズル本体２の上端部には、耐酸化性耐火材質からなる上端開孔部４が一体成形されている。上端開孔５は、ノズル内孔３の孔径より大きく形成されている。ノズル内孔３には、流下する金属溶湯と接触する内側に耐火物層を内張りした内孔体６が形成されている。   Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a cross-sectional view of the upper end portion of the long nozzle 1 according to the present embodiment, FIG. 2 is a cross-sectional view of the refractory sleeve 11, and FIG. 3 is a cross-sectional view of the long nozzle 1 with the refractory sleeve 11 fitted thereto. is there. The long nozzle 1 has a nozzle inner hole 3 passing through the center of the nozzle body 2. An upper end opening 4 made of an oxidation-resistant fireproof material is integrally formed at the upper end of the nozzle body 2. The upper end opening 5 is formed larger than the diameter of the nozzle inner hole 3. The nozzle inner hole 3 is formed with an inner hole body 6 in which a refractory layer is lined inside in contact with the molten metal flowing down.

上端開孔部４には、ノズル内孔３の孔径に合致する縮径孔７が上端開孔５に連続して形成されている。縮径孔７には着脱可能なリング状のキャップ８が嵌装され、下面を内孔体６の上端面に当接している。上端開孔部４の側面には、ガス吹き込み配管の接続管９が取り付けられている。ノズル本体２の外周部及び上端開孔部４の上面は、鉄皮１０で被覆されている。 In the upper end opening portion 4, a diameter-reduced hole 7 that matches the hole diameter of the nozzle inner hole 3 is formed continuously from the upper end opening 5. A detachable ring-shaped cap 8 is fitted in the reduced diameter hole 7, and the lower surface is in contact with the upper end surface of the inner hole body 6. A connecting pipe 9 of a gas blowing pipe is attached to the side surface of the upper end opening 4. The outer periphery of the nozzle body 2 and the upper surface of the upper end opening 4 are covered with an iron skin 10.

図２に示すように耐火物スリーブ１１は、筒状のスリーブ本体１２と上端に一体成形したフランジ１３とから形成されている。耐火物スリーブ１１は、上記内孔体６と同一材質により形成されている。フランジ１３の上面には、上記キャップ８と同一材質によりリング体１４が一体成形されている。リング体１４は、縮径孔７に略緊密に嵌着される。フランジ１３の側面は、下方に向かって径が狭まるテーパー面となっている。また、フランジ１３の下面には、セラミックシート１５が取り付けられている。 As shown in FIG. 2, the refractory sleeve 11 is formed of a cylindrical sleeve body 12 and a flange 13 integrally formed at the upper end. The refractory sleeve 11 is formed of the same material as the inner hole body 6. On the upper surface of the flange 13, a ring body 14 is integrally formed of the same material as the cap 8. The ring body 14 is fitted into the reduced diameter hole 7 substantially tightly. The side surface of the flange 13 is a tapered surface whose diameter is narrowed downward. A ceramic sheet 15 is attached to the lower surface of the flange 13.

上記耐火物スリーブ１１は、鋳造に伴う熱衝撃により浸食された前記内孔体６の上端部内側に嵌装するものである。浸食は不均一な金属溶湯の流れに伴うものであるため、内孔体６の浸食部位が偏る。このため、所定チャージ数の鋳造後、ノズル本体２を設置現場で水平回動させて浸食部位の偏りを解消する。   The refractory sleeve 11 is fitted inside the upper end portion of the inner hole body 6 that has been eroded by the thermal shock associated with casting. Since the erosion is accompanied by a non-uniform flow of the molten metal, the erosion site of the inner hole body 6 is biased. For this reason, after casting a predetermined number of charges, the nozzle body 2 is horizontally rotated at the installation site to eliminate the unevenness of the erosion site.

内孔体６の浸食状況は、経験的に判断可能であり、耐火物スリーブ１１のスリーブ本体１２が嵌装できるまで、内孔体６の浸食が進行した段階で、キャップ８を上端開孔部４の縮径孔７から外す。そして、耐火物スリーブ１１のスリーブ本体１２を内孔体６に嵌装する。このとき、フランジ１３が縮径孔７に嵌着されるとともに、リング体１４が縮径孔７に略緊密に嵌着される。そして、フランジ１３の下面に取り付けたセラミックシート１５が内孔体６の上端面に当接して、該上端面に耐火物スリーブ１１が掛止される。 The erosion status of the inner hole body 6 can be determined empirically, and when the erosion of the inner hole body 6 proceeds until the sleeve main body 12 of the refractory sleeve 11 can be fitted, the cap 8 is opened at the upper end opening portion. 4 is removed from the reduced diameter hole 7. Then, the sleeve body 12 of the refractory sleeve 11 is fitted into the inner hole body 6. At this time, the flange 13 is fitted into the reduced diameter hole 7, and the ring body 14 is fitted into the reduced diameter hole 7 almost tightly. And the ceramic sheet | seat 15 attached to the lower surface of the flange 13 contact | abuts to the upper end surface of the inner hole body 6, and the refractory sleeve 11 is latched by this upper end surface.

上記に説明で明らかなようにロングノズル１は、鋳造に伴う熱衝撃により浸食された内孔体６の内側に、該内孔体６と同一の材質で形成された耐火物スリーブ１１を嵌装し、上端部に一体形成したフランジ１３によりロングノズル１の上端開孔部４に掛止して、ノズル内孔３の内周の上端部にスリーブ本体１２を設置するもので、ノズル内孔３の上端部に新たに浸食のない金属溶湯の接触面を形成できるから、鋳込み時の熱衝撃によりノズル内孔３の上端部が浸食されただけのノズル本体を交換することなく、所定チャージ数の継続使用が可能となり、耐用寿命が延長でき経済性を高めることができる。 As is apparent from the above description, the long nozzle 1 is fitted with a refractory sleeve 11 made of the same material as the inner hole body 6 inside the inner hole body 6 that has been eroded by thermal shock associated with casting. Then, the sleeve body 12 is installed at the upper end portion of the inner periphery of the nozzle inner hole 3 by being hooked to the upper end opening portion 4 of the long nozzle 1 by the flange 13 integrally formed at the upper end portion. A new contact surface of the molten metal without erosion can be formed at the upper end of the nozzle, so that a predetermined number of charges can be obtained without replacing the nozzle body in which the upper end of the nozzle inner hole 3 is only eroded by the thermal shock during casting. Continuous use is possible, and the service life can be extended and the economy can be improved.

また、耐火物スリーブ１１のフランジ１３の上面には、上記キャップ８と同一材質によりリング体１４が一体成形されているから、改めて縮径孔７にキャップ８を嵌着する必要がない等の利点がある。 Further, since the ring body 14 is integrally formed of the same material as the cap 8 on the upper surface of the flange 13 of the refractory sleeve 11, there is an advantage that it is not necessary to fit the cap 8 into the reduced diameter hole 7 again. There is.

本実施例に係るロングノズルの上端部の断面図である。It is sectional drawing of the upper end part of the long nozzle which concerns on a present Example. 耐火物スリーブの断面図である。It is sectional drawing of a refractory sleeve. ロングノズルに耐火物スリーブを嵌装した状態の断面図である。It is sectional drawing of the state which fitted the refractory sleeve to the long nozzle.

符号の説明Explanation of symbols

１ ロングノズル
２ ノズル本体
４ ノズル内孔
６ 内孔体
１１ 耐火物スリーブ
１２ スリーブ本体
１３ フランジ
DESCRIPTION OF SYMBOLS 1 Long nozzle 2 Nozzle main body 4 Nozzle inner hole 6 Inner hole body 11 Refractory sleeve 12 Sleeve main body 13 Flange

Claims (1)

ノズル内孔に耐火物の内孔体を形成し、取鍋内の金属溶湯をタンディシュに注入するロングノズルにおいて、
鋳造に伴う熱衝撃により浸食された前記内孔体の内側に、前記内孔体の材質と同一の材質で形成された耐火物スリーブを嵌装するとともに、該耐火物スリーブの上端部に一体形成したフランジを前記ロングノズルの上端開孔部に掛止して、ノズル内孔の上端部内周に前記耐火物スリーブを設置できるようにしたことを特徴とするロングノズル。 In the long nozzle that forms the inner hole body of refractory in the nozzle inner hole and injects the molten metal in the ladle into the tundish,
A refractory sleeve made of the same material as that of the inner hole body is fitted inside the inner hole body eroded by thermal shock accompanying casting, and is integrally formed at the upper end of the refractory sleeve. The long nozzle is configured such that the refractory sleeve can be installed on the inner periphery of the upper end portion of the nozzle inner hole by hooking the flange to the upper end opening portion of the long nozzle.
JP2007035182A 2007-02-15 2007-02-15 Long nozzle Active JP4809259B2 (en)

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JP4809259B2 JP4809259B2 (en) 2011-11-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010207848A (en) * 2009-03-10 2010-09-24 Nippon Steel Corp Long nozzle and method of manufacturing the same

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768254A (en) * 1980-10-13 1982-04-26 Kawasaki Steel Corp Pepairing method of long nozzle
JPH02235566A (en) * 1989-01-31 1990-09-18 Mannesmann Ag Metal casting nozzle
JPH05285612A (en) * 1992-04-13 1993-11-02 Kurosaki Refract Co Ltd Nozzle inner hole body for continuous casting
JPH09220652A (en) * 1996-02-14 1997-08-26 Akechi Ceramics Kk Long nozzle for continuous casting
JPH10277713A (en) * 1997-04-01 1998-10-20 Kurosaki Refract Co Ltd Nozzle for continuous casting
JP2000094098A (en) * 1998-07-22 2000-04-04 Toshiba Ceramics Co Ltd Pouring tube of tundish
JP2000167658A (en) * 1998-12-07 2000-06-20 Shinagawa Refract Co Ltd Pouring tube for tundish
JP2005125403A (en) * 2003-10-27 2005-05-19 Nippon Steel Corp Long nozzle used for continuous casting and continuous casting method using it
JP2006130555A (en) * 2004-10-04 2006-05-25 Kurosaki Harima Corp Long nozzle for continuous casting, and continuous casting method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768254A (en) * 1980-10-13 1982-04-26 Kawasaki Steel Corp Pepairing method of long nozzle
JPH02235566A (en) * 1989-01-31 1990-09-18 Mannesmann Ag Metal casting nozzle
JPH05285612A (en) * 1992-04-13 1993-11-02 Kurosaki Refract Co Ltd Nozzle inner hole body for continuous casting
JPH09220652A (en) * 1996-02-14 1997-08-26 Akechi Ceramics Kk Long nozzle for continuous casting
JPH10277713A (en) * 1997-04-01 1998-10-20 Kurosaki Refract Co Ltd Nozzle for continuous casting
JP2000094098A (en) * 1998-07-22 2000-04-04 Toshiba Ceramics Co Ltd Pouring tube of tundish
JP2000167658A (en) * 1998-12-07 2000-06-20 Shinagawa Refract Co Ltd Pouring tube for tundish
JP2005125403A (en) * 2003-10-27 2005-05-19 Nippon Steel Corp Long nozzle used for continuous casting and continuous casting method using it
JP2006130555A (en) * 2004-10-04 2006-05-25 Kurosaki Harima Corp Long nozzle for continuous casting, and continuous casting method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010207848A (en) * 2009-03-10 2010-09-24 Nippon Steel Corp Long nozzle and method of manufacturing the same

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