JPH06335754A - Pouring nozzle for twin belt type thin slab continuous casting - Google Patents
Pouring nozzle for twin belt type thin slab continuous castingInfo
- Publication number
- JPH06335754A JPH06335754A JP5145386A JP14538693A JPH06335754A JP H06335754 A JPH06335754 A JP H06335754A JP 5145386 A JP5145386 A JP 5145386A JP 14538693 A JP14538693 A JP 14538693A JP H06335754 A JPH06335754 A JP H06335754A
- Authority
- JP
- Japan
- Prior art keywords
- boron nitride
- continuous casting
- belt type
- nozzle
- type thin
- 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.)
- Pending
Links
Landscapes
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造に使用さ
れる注入ノズルの構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an injection nozzle used for continuous casting of steel.
【０００２】[0002]
【従来の技術】双ベルト式薄スラブ連続鋳造機は、図４
の側断面図に示す如く、所定の板幅を有し相対する回転
ベルト４ａ，４ｂで形成される鋳型５内に注入ノズル６
から溶鋼を注入し、これを下方より引き出して連続的に
薄肉のスラブ７を製造するものである。2. Description of the Related Art A twin belt type thin slab continuous casting machine is shown in FIG.
As shown in the side cross-sectional view of FIG.
Molten steel is poured in from the above, and this is pulled out from below to continuously produce the thin slab 7.
【０００３】ここで製造されるスラブ７は、その断面形
状が広幅かつ偏平な形状で製造されるために、品質の均
一化を図るために注入される溶鋼が鋳型５内の幅方向に
一様に供給される必要があり、従って注入ノズル６のフ
ラット部８の形状は図３の斜視図に示す如く長方形また
は偏平な断面形状とされている。なお、図中の９は湯溜
まり部、１０はタンディッシュからの湯口部である。Since the slab 7 manufactured here has a wide cross-sectional shape and a flat shape, the molten steel injected for uniform quality is uniform in the width direction in the mold 5. Therefore, the flat portion 8 of the injection nozzle 6 has a rectangular or flat cross section as shown in the perspective view of FIG. In the figure, 9 is a pool part and 10 is a sprue part from a tundish.
【０００４】例えば、特開昭５０―６１３３２号、特開
昭６０―２０３３４５号等に開示されている双ベルト式
薄スラブ連続鋳造機による鋳造方法では、長さ１２００
ｍｍ、幅４５０ｍｍ、厚み３０ｍｍの形状のノズルが示
されている。For example, in a casting method using a twin belt type thin slab continuous casting machine disclosed in Japanese Patent Laid-Open Nos. 50-61332 and 60-203345, a length of 1200
A nozzle having a shape of mm, width 450 mm and thickness 30 mm is shown.
【０００５】このように注入ノズル６は、その厚みも鋳
型５の幅から制約を受けて、フラット部８の肉厚も数ｍ
ｍ〜１０数ｍｍといった薄厚に限定されるために、構造
上および強度的見地によりみて極めて不安定であり、ま
た耐熱衝撃性も要求されるので、注入ノズルの材質は一
般的な溶鋼注入ノズルに使用されているアルミナーグラ
ファイト系の耐火物でつくられている。As described above, the thickness of the injection nozzle 6 is restricted by the width of the mold 5, and the thickness of the flat portion 8 is several meters.
Since it is limited to a thin thickness such as m to 10 mm, it is extremely unstable from the viewpoint of structure and strength, and thermal shock resistance is also required. Therefore, the material of the injection nozzle is a general molten steel injection nozzle. It is made of the alumina-graphite refractory used.
【０００６】[0006]
【発明が解決しようとする課題】ところで、溶鋼の注入
中において、図６に示す如く注入ノズル６内を流下する
溶鋼の流量によっては注入ノズル６の出口箇所において
垂れや溶鋼の飛散が生じ、これが下端面でつらら状の付
着物１１となり、これが前記の回転ベルト４ａ，４ｂへ
の接触、あるいは溶鋼飛散に伴うベルト面上への焼き付
きを起こすという問題を生じる。By the way, during the injection of molten steel, depending on the flow rate of the molten steel flowing down in the injection nozzle 6 as shown in FIG. The lower end surface becomes an icicle-like deposit 11, which causes a problem of contact with the rotating belts 4a, 4b or seizure on the belt surface due to molten steel scattering.
【０００７】また、図５に示す如く鋳型５のメニスカス
１２付近は溶鋼の抜熱が大きいために、溶鋼が凝固する
と注入ノズル６―回転ベルト４ａ，４ｂ間での地金１３
によるブリッジングが発生し、スラブ７を引き抜く際に
注入ノズル６も同時に下方に引っ張られるために注入ノ
ズル折損等のトラブルを引き起こす問題がある。Further, as shown in FIG. 5, since the molten heat of the molten steel is large in the vicinity of the meniscus 12 of the mold 5, when the molten steel is solidified, the metal 13 between the injection nozzle 6 and the rotary belts 4a and 4b is melted.
As a result, bridging occurs, and when the slab 7 is pulled out, the injection nozzle 6 is also pulled downward at the same time, which causes a problem such as breakage of the injection nozzle.
【０００８】本発明は、上記の問題点を解決するために
なされたものであり、注入ノズルの先端部への付着物
（地金）の発生を防止し、操業の安定性を図る双ベルト
式薄スラブ連続鋳造用の注入ノズルを提供するものであ
る。The present invention has been made in order to solve the above problems, and is a twin-belt type which prevents the generation of deposits (bare metal) on the tip portion of the injection nozzle and improves the stability of operation. An injection nozzle for thin slab continuous casting is provided.
【０００９】[0009]
【課題を解決するための手段】本発明は、断面が偏平な
スラブを製造する双ベルト式薄スラブ連続鋳造用注入ノ
ズルにおいて、鋳型内の溶鋼に浸漬する該ノズルの先端
部外表面に窒化ホウ素、または窒化ホウ素を含むセラミ
ックスを設けてなることを特徴とする双ベルト式薄スラ
ブ連続鋳造用注入ノズルである。SUMMARY OF THE INVENTION The present invention is a twin belt type thin slab continuous casting injection nozzle for producing a slab having a flat cross section. Boron nitride is formed on the outer surface of the tip of the nozzle immersed in molten steel in a mold. Or a ceramics containing boron nitride, the twin belt type thin slab continuous casting casting nozzle.
【００１０】[0010]
【作用】該注入ノズルの先端部への地金付着が起こる原
因は、溶鋼の注入の状態にもよるが、先端部の形状や表
面性状が最も大きいと考えられる。The cause of the adhesion of the metal to the tip of the injection nozzle depends on the state of injection of molten steel, but it is considered that the shape and surface texture of the tip are the largest.
【００１１】そこで、本発明者等はこの点について検討
した結果、該注入ノズルの先端部表面に溶鋼に対して濡
れ難く（難溶鋼濡れ性）、地金が付着しても容易に脱落
し易い（潤滑性）セラミックスを設置するものである。Therefore, as a result of studying this point, the inventors of the present invention have found that it is difficult for the surface of the tip of the injection nozzle to get wet with molten steel (wettable steel wettability), and even if the metal adheres, it easily falls off. (Lubricity) Ceramics are installed.
【００１２】ここで設置するセラミックス種としては、
上述の特性の他に、熱衝撃に対して割れないこと（耐熱
衝撃性）や熱的に安定である（耐熱性）ことが必要であ
ることから、窒化ホウ素、または窒化ホウ素を含むセラ
ミックスが選定される。The types of ceramics installed here are:
In addition to the characteristics described above, boron nitride or ceramics containing boron nitride is selected because it must not crack (heat shock resistance) and thermally stable (heat resistance) against thermal shock. To be done.
【００１３】[0013]
【実施例】以下に本発明の実施例を説明する。EXAMPLES Examples of the present invention will be described below.
【００１４】図１は、その注入ノズルの正面図、図２は
図１のＡ―Ａ’矢視側面図、図３は図１のＢ―Ｂ’矢視
横断面図を示し、図中、６は注入ノズル本体、１４は窒
化ホウ素、または窒化ホウ素を含むセラミックス、１５
は無機系高温接着剤を示す。FIG. 1 is a front view of the injection nozzle, FIG. 2 is a side view taken along the line AA ′ of FIG. 1, and FIG. 3 is a cross sectional view taken along the line BB ′ of FIG. 6 is an injection nozzle body, 14 is boron nitride, or ceramics containing boron nitride, 15
Indicates an inorganic high temperature adhesive.
【００１５】ノズル本体（アルミナーグラファイト質）
の先端部から２００ｍｍの高さの部分に、厚さ３ｍｍの
窒化ホウ素セラミックスを無機系高温接着剤で隙間なく
設置した。Nozzle body (alumina-graphite)
A boron nitride ceramics having a thickness of 3 mm was placed at a height of 200 mm from the tip of the above with an inorganic high temperature adhesive without any gap.
【００１６】上記のように製作したノズルをバーナーで
１３５０℃×９０分加熱後、双ベルト式薄スラブ連続鋳
造機の鋳型内に挿入し１６００℃の溶鋼を注入し、その
後溶鋼中に浸漬したが、メニスカス部の注入ノズル周り
には地金付着もなく、さらにノズルー鋳型間において、
注入ノズルより鋳型に至たる地金の成長は認められなか
った。The nozzle manufactured as described above was heated with a burner at 1350 ° C. for 90 minutes, then inserted into the mold of a twin-belt type thin slab continuous casting machine, poured with molten steel at 1600 ° C., and then immersed in the molten steel. , There is no metal adhesion around the injection nozzle of the meniscus part, and between the nozzle and mold,
No growth of metal from the injection nozzle to the mold was observed.
【００１７】[0017]
【発明の効果】以上詳述したように、本発明の双ベルト
式薄スラブ連続鋳造用注入ノズルを使用することによ
り、注入ノズルの先端部への付着物（地金）の発生を防
止し、操業の安定性を図ることが可能となった。As described in detail above, by using the twin-belt type thin slab continuous casting casting nozzle of the present invention, the generation of deposits (bare metal) on the tip of the casting nozzle is prevented, It has become possible to stabilize the operation.
【図１】本発明の一実施例のノズルの正面図。FIG. 1 is a front view of a nozzle according to an embodiment of the present invention.
【図２】本発明の一実施例のノズルの側面図。FIG. 2 is a side view of the nozzle according to the embodiment of the present invention.
【図３】本発明の一実施例のノズルの横断面図。FIG. 3 is a cross-sectional view of the nozzle according to the embodiment of the present invention.
【図４】従来の双ベルト式薄スラブ連続鋳造機の一態様
の説明図。FIG. 4 is an explanatory view of one mode of a conventional twin belt type thin slab continuous casting machine.
【図５】従来の注入ノズルの斜視図。FIG. 5 is a perspective view of a conventional injection nozzle.
【図６】注入ノズル先端部への付着物の発達状況の説明
図。FIG. 6 is an explanatory view of the state of development of deposits on the tip of the injection nozzle.
【図７】注入ノズルー回転ベルト間での地金によるブリ
ッジング状況の説明図。FIG. 7 is an explanatory view of a bridging condition by the metal between the injection nozzle and the rotating belt.
４ａ 回転ベルト ４ｂ 回転ベルト ５ 鋳型 ６ 注入ノズル ７ スラブ ８ フラット部 ９ 湯溜まり部 １０ タンディッシュ １１ 付着物 １２ メニスカス １３ 地金 １４ 窒化ホウ素、または窒化ホウ素を含むセラミック
ス １５ 無機系高温接着剤4a rotating belt 4b rotating belt 5 mold 6 injection nozzle 7 slab 8 flat part 9 hot water pool part 10 tundish 11 deposits 12 meniscus 13 bare metal 14 boron nitride or boron nitride ceramics 15 inorganic high temperature adhesive
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浜井 和男 富津市新富20―１ 新日本製鐵株式会社技 術開発本部内 (72)発明者 沢野 清志 富津市新富20―１ 新日本製鐵株式会社技 術開発本部内 (72)発明者 米田 順吉 広島市西区観音新町四丁目６番22号 三菱 重工業株式会社広島製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Hamai 20-1 Shintomi, Futtsu-shi Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Kiyoshi Sawano 20-1 Shintomi, Futtsu Nippon Steel Co., Ltd. (72) Inventor Junkichi Yoneda 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries, Ltd. Hiroshima Works
Claims (1)
式薄スラブ連続鋳造用注入ノズルにおいて、鋳型内の溶
鋼に浸漬する該ノズルの先端部外表面に窒化ホウ素、ま
たは窒化ホウ素を含むセラミックスを設けてなることを
特徴とする双ベルト式薄スラブ連続鋳造用注入ノズル。1. A twin-belt type thin slab continuous casting injection nozzle for producing a slab having a flat cross section. Boron nitride or a ceramic containing boron nitride is formed on the outer surface of the tip of the nozzle immersed in molten steel in a mold. Twin belt type thin slab continuous casting injection nozzle characterized by being provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5145386A JPH06335754A (en) | 1993-05-26 | 1993-05-26 | Pouring nozzle for twin belt type thin slab continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5145386A JPH06335754A (en) | 1993-05-26 | 1993-05-26 | Pouring nozzle for twin belt type thin slab continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06335754A true JPH06335754A (en) | 1994-12-06 |
Family
ID=15384052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5145386A Pending JPH06335754A (en) | 1993-05-26 | 1993-05-26 | Pouring nozzle for twin belt type thin slab continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06335754A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5992711A (en) * | 1997-04-22 | 1999-11-30 | Toshiba Ceramics Co., Ltd. | Integrated submerged entry nozzle and its manufacture |
-
1993
- 1993-05-26 JP JP5145386A patent/JPH06335754A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5992711A (en) * | 1997-04-22 | 1999-11-30 | Toshiba Ceramics Co., Ltd. | Integrated submerged entry nozzle and its manufacture |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |