JPH0631411A - Casting nozzle - Google Patents
Casting nozzleInfo
- Publication number
- JPH0631411A JPH0631411A JP4212388A JP21238892A JPH0631411A JP H0631411 A JPH0631411 A JP H0631411A JP 4212388 A JP4212388 A JP 4212388A JP 21238892 A JP21238892 A JP 21238892A JP H0631411 A JPH0631411 A JP H0631411A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- weight
- casting
- alumina
- sio
- 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- Withdrawn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
- Compositions Of Oxide Ceramics (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
(57)【要約】
【目的】 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。
【構成】 ＺｒＳｉＯ4及びＺｒＯ2の一種または二種を
５０〜８０重量％、製鋼スラグを１〜２０重量％、炭素
５〜３０重量％の組成からなる鋳造用ノズル。
(57) [Summary] [Object] 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. A casting nozzle having a composition of 50 to 80% by weight of ZrSiO 4 and ZrO 2 , 1 to 20% by weight of steelmaking slag, and 5 to 30% by weight of carbon.
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。2. Description of the Related Art 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.
【０００３】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が（例えば、特
開昭５８−４１７６８号公報）、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
力が払われてきたが、同材質における閉塞現象は解決さ
れていない。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 the vicinity of the discharge holes during use, which may lead to the termination of casting. Therefore, many efforts have been made in the past, but the blocking phenomenon in the same material has not been solved.
【０００４】この問題を解決するために、最近ＣａＺｒ
Ｏ3 を含有したノズル材質が開発され（特開昭５７−７
１８６０号公報）、 使用されるようになった。ＣａＺ
ｒＯ3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。In order to solve this problem, recently CaZr
A nozzle material containing O 3 has been developed (Japanese Patent Laid-Open No. 57-7).
No. 1860), it has come to be used. CaZ
rO 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.
【０００５】[0005]
【発明が解決しようとする課題】しかし、ＣａＺｒＯ3
は高価な材質であるということと、消化性に問題がある
ため、保存に対して充分配慮しなければならず、鋳造用
ノズルのような消耗頻度の高い耐火物には不適当であ
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, CaZrO 3
Since is an expensive material and has a problem of digestibility, sufficient consideration must be given to storage, and it is not suitable for refractory materials that are frequently consumed, such as casting nozzles. 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.
【０００６】[0006]
【課題を解決するための手段】本発明は、ＺｒＳｉＯ4
及びＺｒＯ2の一種または二種を５０〜８０重量％，製
鋼スラグを１〜２０重量％、及び炭素５〜３０重量％の
組成からなることを特徴とする。The present invention is directed to ZrSiO 4
And ZrO 2 in one, two or 50-80 wt%, the steel slag 20% by weight, and characterized by comprising the composition of carbon 5-30% by weight.
【０００７】[0007]
【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。一方、
鋳造中ノズル内表層部では、ノズルを構成する製鋼スラ
グ（主成分は２ＣａＯ−ＳｉＯ2） がノズル表層部に付
着したアルミナと反応してＡｌ2Ｏ3−ＣａＯ−ＳｉＯ2
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 composed mainly of alumina mixed in the molten steel come into contact with and temporarily adhere to the surface layer inside the nozzle. on the other hand,
Within during casting nozzle surface portion, steel slag constituting the nozzle (main component 2CaO-SiO 2) reacts with alumina has adhered to the nozzle surface portion Al 2 O 3 -CaO-SiO 2
This produces a low melting point product of the system.
【０００８】Ａｌ2Ｏ3−ＣａＯ−ＳｉＯ2 系生成物で
は、図１に示すＡｌ2Ｏ3−ＣａＯ−ＳｉＯ2 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−ＳｉＯ2 系組成物になる。
（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。In the Al 2 O 3 --CaO--SiO 2 system product, as is clear from the Al 2 O 3 --CaO--SiO 2 phase equilibrium diagram shown in FIG. It becomes Al 2 O 3 -CaO-SiO 2 based composition b).
Since the melting point of (b) is lower than the casting temperature (1550 to 1600 ° C.), it melts without adhering.
【０００９】本発明に用いる製鋼スラグとは例えば、転
炉スラグ、電気炉スラグ、二次精錬スラグ、取鍋スラ
グ、タンディッシュスラグ等である。また製鋼スラグの
ＣａＯ／ＳｉＯ2は２．５〜７．５が望ましく、製鋼ス
ラグ全組成中のＣａＯ＋ＳｉＯ2の重量比率は９０％以
上が望ましい。The steelmaking slag used in the present invention is, for example, converter slag, electric furnace slag, secondary refining slag, ladle slag, tundish slag and the like. Further, CaO / SiO 2 of the steelmaking slag is preferably 2.5 to 7.5, and the weight ratio of CaO + SiO 2 in the total composition of the steelmaking slag is preferably 90% or more.
【００１０】ＣａＯ＋ＳｉＯ2 の重量比率は９０重量％
以下では、Ａｌ2Ｏ3との低融点化反応を起こさないから
であり、逆に９０重量％以上では耐食性に劣るためであ
る。The weight ratio of CaO + SiO 2 is 90% by weight.
This is because in the following, the reaction for lowering the melting point with Al 2 O 3 does not occur, and conversely, when it is 90% by weight or more, the corrosion resistance is poor.
【００１１】さらに、製鋼スラグは通常廃棄されるのが
普通であり、コスト面でも他の低融点化させるための添
加材質に比べて有利であり、また転炉スラグの主成分で
ある２ＣａＯ−ＳｉＯ2 は融点が２１３０℃と高く、予
熱中、鋳造中に溶けることなく、外来アルミナと接触し
て初めて低融点化反応を起こしアルミナ付着を防止す
る。Further, steelmaking slag is usually discarded, which is advantageous in terms of cost as compared with other additive materials for lowering the melting point, and 2CaO-SiO, which is the main component of converter slag. No. 2 has a high melting point of 2130 ° C., and it does not melt during preheating and casting, and causes a melting point lowering reaction only when it comes into contact with exogenous alumina to prevent alumina adhesion.
【００１２】ノズルを構成する材質で、低融点物を生成
する製鋼スラグの ＣａＯ／ＳｉＯ2は２．５〜７．５の
範囲が望ましい。これはＣａＯ／ＳｉＯ2 が２．５以下
ではＣａＯ量が少なく、主成分が２ＣａＯ−ＳｉＯ2 に
ならず融点が１５００℃近傍になり、鋳造中に流失して
しまう。またＣａＯ／ＳｉＯ2 が７．５以上では遊離の
ＣａＯが多くなり、消化性の問題からノズルとして製造
できなくなる。CaO / SiO 2 of the steelmaking slag, which is a material forming the nozzle and produces a low melting point material, is preferably in the range of 2.5 to 7.5. This is because when CaO / SiO 2 is 2.5 or less, the amount of CaO is small, the main component is not 2CaO-SiO 2 , and the melting point is around 1500 ° C., which is lost during casting. On the other hand, if CaO / SiO 2 is 7.5 or more, the amount of free CaO increases, and it becomes impossible to manufacture it as a nozzle due to the problem of digestibility.
【００１３】製鋼スラグの配合量は、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。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
く、長時間に渡り所定の溶鋼量を注入できる。製鋼スラ
グのサイズは、通常の耐火物原料として用いられる１０
０μｍ以下のものが望ましい。The steel slag content is preferably 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. Within the scope of the present invention, even if the alumina reacts with alumina and is melted and damaged, the diameter of the nozzle is not greatly expanded, and a predetermined amount of molten steel can be injected over a long period of time. The size of steelmaking slag is 10 used as a normal refractory raw material.
It is preferably 0 μm or less.
【００１４】さらに、本発明においてはノズル自体の耐
食性を付与するために、ジルコンまたはジルコニアを６
０〜８０重量％を配合した材質とする。ノズルの耐食性
向上に効果があるジルコン、ジルコニアの配合量は、５
０〜８０重量％が望ましい。これは、５０重量％未満で
は、耐食性が劣り、さらに付着防止効果が薄く、逆に８
０重量％を超えると耐スポール性が劣るためである。ジ
ルコン、ジルコニアは８０％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２００μｍ以下のものが望ましい。Further, in the present invention, zircon or zirconia is added in order to impart corrosion resistance to the nozzle itself.
The material is 0 to 80% by weight. The compounding amount of zircon and zirconia that is effective in improving the corrosion resistance of the nozzle is 5
0 to 80% by weight is desirable. If it is less than 50% by weight, the corrosion resistance is poor, and the anti-adhesion effect is low.
This is because if it exceeds 0% by weight, the spall resistance is poor. It is desirable that zircon and zirconia have a purity as high as 80% or more as much as possible, and electromelted products, sintered products and the like can be used, but the crystal size is preferably 200 μm or less used as a usual refractory raw material. .
【００１５】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％配合した材質
とする。耐熱衝撃性、耐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、耐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。Further, in the present invention, in order to improve the thermal shock resistance, the nozzle is made of a material containing 5 to 30% by weight of carbon. The amount of carbon having an effect on thermal shock resistance and slag infiltration resistance is preferably 5 to 30% by weight. If the carbon content is less than 5% by weight, the thermal shock resistance and the slag infiltration resistance are inferior, and
This is because the oxidation resistance is remarkably lowered when the content exceeds the weight%. The carbon source refers to natural or artificial graphite, mesophase carbon, carbon black, etc., and is preferably a high-purity carbon source of 80% or more.
【００１６】[0016]
【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２は本発明のノズルの説明図であり、１はタンデイッ
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。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. 2 is an explanatory view of the nozzle of the present invention, 1 is a tundish body, 2 is an upper nozzle, 3 is a sliding nozzle,
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.
【００１７】表１に本発明のノズルの化学組成と使用し
た製鋼スラグの種類を示す。さらに、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、Ｎｏ．１、７は浸漬ノズル、Ｎｏ．
５、９は全てのノズル、Ｎｏ．２、３は上ノズル、４は
中間ノズル、Ｎｏ．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８５ｍｍであった。Table 1 shows the chemical composition of the nozzle of the present invention and the type of steelmaking slag used. Further, 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 where these nozzles are used are No. Nos. 1 and 7 are immersion nozzles, and No.
Nos. 5 and 9 are all nozzles. Nos. 2 and 3 are upper nozzles, 4 are intermediate nozzles, and No. 6 and 8 are sliding nozzles,
The initial inner diameters of the nozzles were all 85 mm.
【００１８】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０．５〜１．５ｍｍ、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 melting loss of 0.5 to 1.5 mm and an adhesion thickness of 0.5 to 2.
It was as good as 0 mm.
【００１９】[0019]
【表１】 [Table 1]
【００２０】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、Ｎｏ．１０、１１は中間ノズル、Ｎｏ．１２は
スライディングノズル、Ｎｏ．１３、１５は浸漬ノズ
ル、Ｎｏ．１４は上ノズルである。その結果を表２に示
す。For comparison, the same experiment as in this example was conducted using the nozzle materials shown in Table 2. Where to use these nozzles, see No. Nos. 10 and 11 are intermediate nozzles. 12 is a sliding nozzle, No. 12 Nos. 13 and 15 are immersion nozzles, and No. 14 is an upper nozzle. The results are shown in Table 2.
【００２１】[0021]
【表２】 [Table 2]
【００２２】７チャージ連続鋳造後の付着最大厚みは
３．０〜１２．５ｍｍ、ノズル最大溶損量は３．０〜１
５．０ｍｍであり、本発明に比べ付着厚みで１．５〜６
倍、溶損量で、２〜１０倍多かった。The maximum adhesion thickness after 7-charge continuous casting is 3.0 to 12.5 mm, and the maximum nozzle melt loss is 3.0 to 1.
5.0 mm, which is 1.5 to 6 in adhesion thickness as compared with the present invention.
The amount of melting loss was 2 to 10 times higher.
【００２３】[0023]
【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, the nozzle clogging at the time of continuous casting operation is reduced, stable operation and improvement of productivity are brought about, the manufacturing cost of molten steel, and further refractory for casting The unit and cost can be reduced.
【図面の簡単な説明】[Brief description of drawings]
【図１】Ａｌ2Ｏ3−ＣａＯ−ＳｉＯ2の相平衡状態図で
ある。FIG. 1 is a phase equilibrium diagram of Al 2 O 3 —CaO—SiO 2 .
【図２】本発明の実施例の側断面図である。FIG. 2 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)
種を５０〜８０重量％、製鋼スラグを１〜２０重量％、
及び炭素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. One or two kinds of ZrSiO 4 and ZrO 2 is 50 to 80% by weight, steelmaking slag is 1 to 20% by weight,
And a composition of 5 to 30% by weight of carbon, a casting nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4212388A JPH0631411A (en) | 1992-07-17 | 1992-07-17 | Casting nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4212388A JPH0631411A (en) | 1992-07-17 | 1992-07-17 | Casting nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0631411A true JPH0631411A (en) | 1994-02-08 |
Family
ID=16621761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4212388A Withdrawn JPH0631411A (en) | 1992-07-17 | 1992-07-17 | Casting nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0631411A (en) |
-
1992
- 1992-07-17 JP JP4212388A patent/JPH0631411A/en not_active Withdrawn
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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: 19991005 |