JPH06142861A - Nozzle for casting - Google Patents
Nozzle for castingInfo
- Publication number
- JPH06142861A JPH06142861A JP4323821A JP32382192A JPH06142861A JP H06142861 A JPH06142861 A JP H06142861A JP 4323821 A JP4323821 A JP 4323821A JP 32382192 A JP32382192 A JP 32382192A JP H06142861 A JPH06142861 A JP H06142861A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- bao
- cao
- alumina
- casting
- 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.)
- Withdrawn
Links
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造に用いる
ノズルの閉塞を防止する鋳造用ノズルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting nozzle which prevents clogging of a nozzle used for continuous casting of steel.
【０００２】[0002]
【従来の技術】鋳造用ノズルとは、取鍋とタンディッシ
ュ間、及びタンディッシュと鋳型間に使用される。例え
ば、スライディングノズルは鋳型への溶鋼量を調整する
ための重要な部材である。従来、この鋳造用ノズルには
耐熱スポーリング性かつ耐食性を考慮し黒鉛−アルミナ
質、黒鉛−ジルコニア質のものが主に使用されている
（例えば、特開昭５８−４１７６８号公報）が、使用中
に内面あるいは吐出孔付近にアルミナが付着し、鋳造中
止においこまれることもめずらしくない。このため、従
来から多くの努力が払われてきた。この問題を解決する
ために、最近ＣａＺｒＯ3 を含有したノズル材質が開発
され（特開昭５７−７１８６０号公報）、使用されるよ
うになった。 ＣａＺｒＯ3はアルミナと反応して、低融
点物質を生成する。この物質は表面に留まらずに溶流す
るため、アルミナの付着が生じず、ノズル閉塞を防止で
きる。A casting nozzle is used between a ladle and a tundish, and between a tundish and a mold. For example, the sliding nozzle is an important member for adjusting the molten steel amount in the mold. Conventionally, graphite-alumina and graphite-zirconia-based nozzles have been mainly used for this casting nozzle in consideration of heat-resistant spalling resistance and corrosion resistance (for example, JP-A-58-41768). It is not uncommon for alumina to adhere to the inner surface or near the discharge holes, which can lead to the suspension of casting. Therefore, many efforts have been made in the past. In order to solve this problem, a nozzle material containing CaZrO 3 has recently been developed (Japanese Patent Application Laid-Open No. 57-71860) and has come into use. CaZrO 3 reacts with alumina to form a low melting point material. Since this substance does not stay on the surface but melts, alumina is not adhered and nozzle clogging can be prevented.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ＣａＺ
ｒＯ3 を含有した材質であっても、期待通りの付着防止
効果を発現しないことが、数多く見られる。これは、低
融点化させるノズル内のＣａＺｒＯ3 の量よりも、付着
するＡｌ2Ｏ3の量が多いため、付着溶損バランスが崩れ
るためである。本発明は、鋳造用ノズル内壁へのアルミ
ナ付着によるノズル閉塞を防止できる鋳造用ノズルを提
供することを目的とする。[Problems to be Solved by the Invention] However, CaZ
It is often found that even a material containing rO 3 does not exhibit the expected anti-adhesion effect. This is because the amount of adhered Al 2 O 3 is larger than the amount of CaZrO 3 in the nozzle for lowering the melting point, so that the adhesion melt loss balance is disrupted. An object of the present invention is to provide a casting nozzle capable of preventing nozzle clogging due to adhesion of alumina to the inner wall of the casting nozzle.
【０００４】[0004]
【課題を解決するための手段】本発明の鋳造用ノズルは
ＣａＯとＺｒＯ2 比が重量比で５〜３５対６５〜９５よ
りなる組成の粒子を５０〜９４重量％、ＢａＯまたはＢ
ａＳＯ4 のうち一種または二種を１〜２０重量％、炭素
５〜３０重量％の組成からなることを特徴とする。In the casting nozzle of the present invention, 50 to 94% by weight of particles having a composition of CaO to ZrO 2 in a weight ratio of 5 to 35:65 to 95, BaO or B is used.
One or two kinds of aSO 4 is composed of 1 to 20% by weight and carbon of 5 to 30% by weight.
【０００５】[0005]
【作用】本発明のノズルを用いて、溶鋼を鋳造した場
合、溶鋼に混在するアルミナを主体としたいわゆる介在
物がノズル内表層部に接触し一時的に付着する。ノズル
表層部ではＺｒＯ2・ＣａＯ がＣａＯとＺｒＯ2 に解離
し、またＢａＳＯ4は鋼中酸素によって酸化されてＢａ
Ｏになる。このＣａＯ、ＢａＯがノズル表層部に付着し
たアルミナと反応してＡｌ2Ｏ3−ＣａＯ系、及びＡｌ2
Ｏ3−ＢａＯ系の低融点物を生成する。When molten steel is cast using the nozzle of the present invention, so-called inclusions mainly composed of alumina mixed in molten steel come into contact with the surface layer of the nozzle and are temporarily attached thereto. At the surface layer of the nozzle, ZrO 2 · CaO is dissociated into CaO and ZrO 2 , and BaSO 4 is oxidized by oxygen in the steel to form BaO.
It becomes O. The CaO and BaO react with the alumina adhering to the surface layer of the nozzle to react with Al 2 O 3 -CaO system, and Al 2
O 3 to produce a low melting point of -BaO system.
【０００６】例えば、Ａｌ2Ｏ3−ＣａＯ系生成物では、
図１に示すＡｌ2Ｏ3−ＣａＯ相平衡状態図から明らかの
ように、高濃度のイのアルミナはロのＡｌ2Ｏ3−ＣａＯ
になる。ロの融点は、鋳造温度（１５５０〜１６００
℃）よりも低いため、付着することなく溶流する。又、
Ａｌ2Ｏ3−ＢａＯ系でも、図２に示すＡｌ2Ｏ3−ＢａＯ
相平衡状態図から明らかのように、ハの高濃度のアルミ
ナはニのＡｌ2Ｏ3−３ＢａＯになり、ノズルに付着する
ことなく溶流する。For example, in the Al 2 O 3 -CaO system product,
As is clear from the Al 2 O 3 —CaO phase equilibrium diagram shown in FIG. 1, the high-concentration alumina has a low Al 2 O 3 —CaO content.
become. The melting point of (b) is the casting temperature (1550 to 1600).
(° C), it melts without adhering. or,
Even in the Al 2 O 3 —BaO system, the Al 2 O 3 —BaO shown in FIG.
As is clear from the phase equilibrium diagram, the high-concentration alumina of C becomes Al 2 O 3 -3BaO of 2 and melts without adhering to the nozzle.
【０００７】本発明に用いるＣａＯ成分を５〜３５重量
％含有するカルシウムジルコネート系クリンカーの配合
量の設定範囲については、５０重量％未満では、耐食性
に劣ることになり、また９４重量％をこえると耐スポー
ル性に劣る結果となる。このため５０〜９４重量％の範
囲が望ましい。またカルシウムジルコネート系クリンカ
ーのＣａＯ含有量については５重量％未満では付着防止
に効果がなく、３５重量％をこえるとＺｒＯ2 含有量が
少なく耐食性に劣る結果となるため５〜３５重量％の範
囲が望ましい。When the calcium zirconate clinker containing CaO component used in the present invention is contained in an amount of 5 to 35% by weight, the corrosion resistance is inferior when it is less than 50% by weight, and exceeds 94% by weight. And, the result is inferior spall resistance. Therefore, the range of 50 to 94% by weight is desirable. Regarding the CaO content of the calcium zirconate clinker, if it is less than 5% by weight, there is no effect in preventing adhesion, and if it exceeds 35% by weight, the ZrO 2 content is small and the corrosion resistance is poor, so the range is from 5 to 35% by weight. Is desirable.
【０００８】ノズルを構成する材質で、低融点物をつく
るＢａＯ、ＢａＳＯ4 の配合量は、１〜２０重量％が望
ましい。これは１重量％未満では、付着防止に効果が薄
く、逆に２０重量％を超えると、ノズルの異常溶損が起
きるためである。It is desirable that the compounding amount of BaO and BaSO 4 , which is a material forming the nozzle and forms a low melting point material, be 1 to 20% by weight. This is because if it is less than 1% by weight, the effect of preventing adhesion is weak, and if it exceeds 20% by weight, abnormal melting loss of the nozzle occurs.
【０００９】Ａｌ2Ｏ3を低融点化させるためにＢａＯが
必要であるがＢａＳＯ4 はＢａＯに比べて安価であり、
酸化してＢａＯになるためＢａＯと併用して添加しても
問題ないが、分子量がＢａＯに比べて大きくなり、同じ
量ではＢａＯに比べ付着防止効果は薄い、そのためアル
ミナ付着防止効果の程度に応じて、任意にＢａＯとＢａ
ＳＯ4割合を変更することによりアルミナ付着を防止で
きる。BaO is necessary to lower the melting point of Al 2 O 3 , but BaSO 4 is cheaper than BaO,
Since it oxidizes to BaO, there is no problem if it is added together with BaO, but the molecular weight becomes larger than that of BaO, and the same amount has a lower adhesion preventing effect than BaO. Therefore, it depends on the degree of alumina adhesion preventing effect. And optionally BaO and Ba
Alumina adhesion can be prevented by changing the SO 4 ratio.
【００１０】なお、その他のＢａ化合物は劇物であり取
扱いに注意を要することや、高価であるためふさわしく
ない。本発明の範囲内ではアルミナと反応して溶損して
も、ノズルとしての口径拡大は大きくなり、長時間に渡
り所定の溶鋼量を注入できる。ＢａＯ、ＢａＳＯ4 は８
０％以上のできるだけ高純度であることが望ましく、電
融品、焼結品などが使用可能であるが、結晶サイズは、
通常の耐火物原料として用いられる、１００μｍ以下の
ものが望ましい。Other Ba compounds are not suitable because they are deleterious substances that require careful handling and are expensive. Within the scope of the present invention, even if the alumina reacts with alumina and is melted and damaged, the diameter of the nozzle increases, and a predetermined amount of molten steel can be injected over a long period of time. 8 for BaO and BaSO 4
It is desirable that the purity is 0% or more as high as possible, and electromelted products, sintered products, etc. can be used, but the crystal size is
It is preferably 100 μm or less, which is used as a normal refractory raw material.
【００１１】さらに、本発明において、耐熱衝撃性を高
めるためにノズルに炭素を５〜３０重量％を配した材質
とする。耐熱衝撃性、対スラグ浸潤性に効果のある炭素
は５〜３０重量％が望ましい。これは、炭素が５重量％
未満では、耐熱衝撃性、対スラグ浸潤性に劣り、３０重
量％を超えると耐酸化性が著しく低下するからである。
炭素源は、天然または、人造黒鉛、メソフェーズカーボ
ン、カーボンブラック等を指し、８０％以上の高純度の
ものが望ましい。炭素の好ましい粒径は、３ｍｍ以下で
ある。これは３ｍｍ以上ではノズル強度が低下するため
である。Further, in the present invention, in order to enhance the thermal shock resistance, the nozzle is made of a material containing 5 to 30% by weight of carbon. The amount of carbon which is effective for thermal shock resistance and slag infiltration is preferably 5 to 30% by weight. This is 5% by weight of carbon
If it is less than 30% by weight, the thermal shock resistance and slag infiltration resistance are poor, and if it exceeds 30% by weight, the oxidation resistance is significantly reduced.
The carbon source refers to natural or artificial graphite, mesophase carbon, carbon black or the like, and is preferably a high purity of 80% or more. The preferred particle size of carbon is 3 mm or less. This is because the nozzle strength decreases when the thickness is 3 mm or more.
【００１２】[0012]
【実施例】以下、実施例に基づいて本発明について説明
する。本発明の連続鋳造用ノズルを２ストランド型連続
鋳造設備に適用し、アルミナ付着防止効果を確認した。
図３は本発明のノズルの説明図であり、１はタンディッ
シュ本体、２は上ノズル、３はスライディングノズル、
４は中間ノズル、５は浸漬ノズル、６はパウダーライン
溶損防止のための従来からあるＺｒＯ2 −黒鉛系耐火物
であり、５の外側を覆っている。表１は本発明のノズル
を使用して鋳造した例であり、低炭アルミキルド鋼
（Ｃ：０．０３５％，Ａｌ：０．０１８％）３５０ｔｏ
ｎを７チャージ連続して鋳造した。また、これらのノズ
ルの使用場所は、１，７は浸漬ノズル、５，９は全ての
ノズル、２，３は上ノズル、４は中間ノズル、６，８は
スライディングノズルで、ノズルの初期内径は全て８５
ｍｍであった。EXAMPLES The present invention will be described below based on examples. The continuous casting nozzle of the present invention was applied to a two-strand type continuous casting facility, and the effect of preventing alumina adhesion was confirmed.
FIG. 3 is an explanatory view of a nozzle of the present invention, 1 is a tundish body, 2 is an upper nozzle, 3 is a sliding nozzle,
Reference numeral 4 is an intermediate nozzle, 5 is a dipping nozzle, 6 is a conventional ZrO 2 -graphite refractory for preventing powder line melting damage, which covers the outside of 5. Table 1 is an example of casting using the nozzle of the present invention, low carbon aluminized steel (C: 0.035%, Al: 0.018%) 350 to
n was continuously cast for 7 charges. The locations of these nozzles are as follows: 1, 7 are immersion nozzles, 5 and 9 are all nozzles, 2 and 3 are upper nozzles, 4 are intermediate nozzles, and 6 and 8 are sliding nozzles. All 85
It was mm.
【００１３】７チャージ連続鋳造終了後にノズルを回収
し、アルミナの最大付着厚みと、ノズルの最大溶損量を
測定した。その結果を表１に示す。本実施例のノズルは
溶損量が０．５〜２．０ｍｍ、付着厚みが０．５〜２．
０ｍｍと良好であった。After the completion of the 7-charge continuous casting, the nozzle was recovered, and the maximum adhesion thickness of alumina and the maximum amount of melt loss of the nozzle were measured. The results are shown in Table 1. The nozzle of this embodiment has a melt loss of 0.5 to 2.0 mm and an adhesion thickness of 0.5 to 2.
It was as good as 0 mm.
【００１４】[0014]
【表１】 [Table 1]
【００１５】なお、比較のため、表２に示すノズル材質
で本実施例と同様な実験を行った。これらのノズルの使
用場所は、１０，１１は上ノズル、１２は中間ノズル、
１３，１５は浸漬ノズル、１４はスライディングノズル
である。その結果を表２に示す。For comparison, the same experiment as this example was conducted using the nozzle material shown in Table 2. These nozzles are used at 10, 11 upper nozzles, 12 intermediate nozzles,
Reference numerals 13 and 15 are immersion nozzles, and 14 is a sliding nozzle. The results are shown in Table 2.
【００１６】[0016]
【表２】 [Table 2]
【００１７】７チャージ連続鋳造後の付着最大厚みは、
３．５〜１５．５ｍｍ、ノズル最大溶損量は３．０〜
７．０ｍｍであり、本発明の鋳造用ノズルに比べ、付着
厚みで１．５〜７．５倍、溶損量で、１．５〜３．５倍
多かった。The maximum adhesion thickness after 7-charge continuous casting is
3.5 to 15.5 mm, maximum nozzle melt loss is 3.0 to
The thickness was 7.0 mm, and the deposit thickness was 1.5 to 7.5 times and the melting loss amount was 1.5 to 3.5 times larger than that of the casting nozzle of the present invention.
【００１８】[0018]
【発明の効果】本発明によれば、鋼の連続鋳造において
多連鋳操業時のノズル閉塞を低減し、安定操業と生産性
の向上をもたらし、溶鋼の製造コスト、さらに鋳造用耐
火物の原単位及びコスト低減を図ることができる。According to the present invention, in continuous casting of steel, it is possible to reduce the nozzle clogging during the continuous casting operation, to bring about stable operation and improvement in productivity, the production cost of molten steel, and the original refractory material for casting. The unit and cost can be reduced.
【図１】Ａｌ2Ｏ3−ＣａＯの相平衡状態図である。FIG. 1 is a phase equilibrium diagram of Al 2 O 3 —CaO.
【図２】Ａｌ2Ｏ3−ＢａＯの相平衡状態図である。FIG. 2 is a phase equilibrium diagram of Al 2 O 3 —BaO.
【図３】本発明の実施例の側断面図である。FIG. 3 is a side sectional view of an embodiment of the present invention.
１ タンディッシュ本体 ２ 上ノズル ３ スライディングノズル ４ 中間ノズル ５ 浸漬ノズル ６ 浸漬ノズルパウダーライン 1 Tundish body 2 Upper nozzle 3 Sliding nozzle 4 Intermediate nozzle 5 Immersion nozzle 6 Immersion nozzle Powder line
Claims (1)
５対６５〜９５よりなる組成の粒子を５０〜９４重量
％、ＢａＯまたはＢａＳＯ4 のうち一種または二種を１
〜２０重量％、炭素５〜３０重量％の組成からなること
を特徴とする鋳造用ノズル。1. The weight ratio of CaO to ZrO 2 is 5 to 3.
50 to 94% by weight of particles having a composition of 5 to 65 to 95, and 1 or 2 of BaO or BaSO 4
A casting nozzle characterized by having a composition of -20% by weight and carbon 5-30% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4323821A JPH06142861A (en) | 1992-11-10 | 1992-11-10 | Nozzle for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4323821A JPH06142861A (en) | 1992-11-10 | 1992-11-10 | Nozzle for casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06142861A true JPH06142861A (en) | 1994-05-24 |
Family
ID=18158981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4323821A Withdrawn JPH06142861A (en) | 1992-11-10 | 1992-11-10 | Nozzle for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06142861A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010127810A1 (en) * | 2009-05-07 | 2010-11-11 | Refractory Intellectual Property Gmbh & Co. Kg | Moulded product consisting of a fire-proof ceramic material |
-
1992
- 1992-11-10 JP JP4323821A patent/JPH06142861A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010127810A1 (en) * | 2009-05-07 | 2010-11-11 | Refractory Intellectual Property Gmbh & Co. Kg | Moulded product consisting of a fire-proof ceramic material |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000201 |