JP2000334550A - Coating agent of immersion nozzle for continuous casting - Google Patents
Coating agent of immersion nozzle for continuous castingInfo
- Publication number
- JP2000334550A JP2000334550A JP11145454A JP14545499A JP2000334550A JP 2000334550 A JP2000334550 A JP 2000334550A JP 11145454 A JP11145454 A JP 11145454A JP 14545499 A JP14545499 A JP 14545499A JP 2000334550 A JP2000334550 A JP 2000334550A
- Authority
- JP
- Japan
- Prior art keywords
- coating agent
- immersion nozzle
- dispersion medium
- continuous casting
- coating
- 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- Withdrawn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]
【発明の属する技術分野】本発明は、連続鋳造用浸漬ノ
ズルの内・外管面に被覆するコーティング剤に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating agent for coating inner and outer pipe surfaces of a continuous casting immersion nozzle.
【０００２】[0002]
【従来の技術】連続鋳造では取鍋からタンデシュ、タン
デシュからモ−ルドに溶鋼を移動させているが、それぞ
れは浸漬ノズルを通じて連続化している。この浸漬ノズ
ルには耐食性、耐スポ−リング性に優れたアルミナ・グ
ラファイト質煉瓦が適用されている。特に、アルミナマ
グネシア系の酸化物を被覆した内管は、多数提案されて
いる。アルミナマグネシア系の酸化物に、さらに、鉄酸
化物を内管の溶鋼浸漬面に塗布したものが使用されてい
る。これは、内管の溶鋼浸漬面上で溶鋼中から析出した
アルミナとコーティング剤中の鉄酸化物（Ｆｅ2 Ｏ3 ）
とを反応させてアルミナ付着層の形成を防止することを
狙いとしたものである（「耐火物」Ｎｏ．５０、Ｖｏ
ｌ．１０、１９９８、ｐ５１０）。2. Description of the Related Art In continuous casting, molten steel is moved from a ladle to a tundesh and from a tundesh to a mold, but each is made continuous through a dipping nozzle. Alumina-graphite bricks having excellent corrosion resistance and spalling resistance are applied to the immersion nozzle. In particular, many inner tubes coated with an alumina-magnesia-based oxide have been proposed. Alumina-magnesia-based oxides further coated with iron oxide on the molten steel immersion surface of the inner tube are used. This is because alumina precipitated from the molten steel on the molten steel immersion surface of the inner tube and iron oxide (Fe 2 O 3 ) in the coating agent
To prevent the formation of an alumina adhered layer ("Refractory" No. 50, Vo
l. 10, 1998, p510).
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
酸化鉄粉体は粒径が１００μｍ〜１ｍｍと粗粒であるた
め、形成した酸化物の被膜は凹凸が大きく、コーティン
グ剤の添加量によっては内管面で侵食され易く安定した
効果が得られない。また、形成された被膜の剥離、垂れ
落ちまたは球滴化等の問題もあり、安定した被膜を形成
するコーティング剤が必要であった。However, since the above iron oxide powder is coarse, having a particle size of 100 μm to 1 mm, the formed oxide film has large irregularities, and depending on the amount of coating agent added, It is easily eroded on the tube surface, and a stable effect cannot be obtained. In addition, there is also a problem such as peeling, dripping or spheroidization of the formed film, and a coating agent that forms a stable film is required.
【０００４】本発明の目的は、連続鋳造用の浸漬ノズル
の内管面に加えて、外管面にも化学的に安定な凹凸の小
さい平滑な酸化物を形成でき、従来問題になっていた剥
離、垂れ落ちまたは球滴化等の問題を低減できるコーテ
ィング剤を提供することにある。An object of the present invention is to form a chemically stable and smooth oxide with small irregularities on the outer tube surface in addition to the inner tube surface of the immersion nozzle for continuous casting. An object of the present invention is to provide a coating agent capable of reducing problems such as peeling, dripping, and spheroidization.
【０００５】[0005]
【課題を解決するための手段】本発明者は、各種試験を
重ねた結果、下記の知見を得た。 （Ａ) 耐火性の酸化物、バインダ、有機系糊剤および分
散媒から構成されたコーティング剤において、有機系糊
剤および分散媒を除く配合量で５０〜８０重量％を粒子
径１０〜２００ｎｍの超微粒子の耐火性の各種酸化物を
含有し、超微粒子中のＭｇＯの配合量を有機系糊剤およ
び分散媒を除く配合量で４０〜８０重量％含有するコー
ティング剤を連続鋳造用浸漬ノズルの内・外管面に使用
すると、化学的に安定な酸化物を形成でき、しかも形成
被膜表面を凹凸の小さい平滑面にすることができる。The present inventors have obtained the following findings as a result of repeated tests. (A) In a coating agent composed of a refractory oxide, a binder, an organic sizing agent and a dispersion medium, 50 to 80% by weight in a compounding amount excluding the organic sizing agent and the dispersion medium is added in a particle size of 10 to 200 nm. An immersion nozzle for continuous casting contains a coating agent containing various kinds of oxides having a refractory property of ultrafine particles and containing 40 to 80% by weight of MgO in the ultrafine particles in a compounding amount excluding the organic paste and the dispersion medium. When used on the inner and outer tube surfaces, a chemically stable oxide can be formed, and the formed coating surface can be made a smooth surface with small irregularities.
【０００６】（Ｂ) 上記超微粒子は、、ＭｇＯを主成分
として、ＭｎＯ、ＳｉＯ2 、Ｎａ2Ｏ、Ｋ2 Ｏ、Ｆｅ2
Ｏ3 、Ａｌ2 Ｏ3 、ＴｉＯ2 、ＣａＯ、Ｙ2 Ｏ3 、Ｚｒ
Ｏ2との組合わせからなる混合物を用いると、さらに連
続鋳造用浸漬ノズルの内・外管面に化学的に安定な酸化
物を形成でき、しかも形成被膜表面を凹凸の小さい平滑
面にすることができる。(B) The ultrafine particles contain MgO as a main component, and contain MnO, SiO 2 , Na 2 O, K 2 O, Fe 2
O 3 , Al 2 O 3 , TiO 2 , CaO, Y 2 O 3 , Zr
By using a mixture composed of a combination with O 2 , a chemically stable oxide can be formed on the inner and outer pipe surfaces of the continuous casting immersion nozzle, and the formed coating surface has a smooth surface with small irregularities. Can be.
【０００７】（Ｃ) 上記酸化物の内で、Ｆｅ2 Ｏ3 、Ａ
ｌ2 Ｏ3 、ＴｉＯ2 は、合計配合量で１０重量％未満の
範囲で使用するのが好ましい。これらの成分は、１０重
量％以上になると連続鋳造用浸漬ノズルの内・外管面の
耐火物を劣化（酸化、侵食）させるため連続操業上好ま
しくない。(C) Among the above oxides, Fe 2 O 3 , A
It is preferable to use l 2 O 3 and TiO 2 in a range of less than 10% by weight in total. If these components exceed 10% by weight, the refractories on the inner and outer tube surfaces of the continuous casting immersion nozzle are deteriorated (oxidized and eroded), which is not preferable for continuous operation.
【０００８】本発明は、以上の知見に基づいてなされた
もので、その要旨は、下記のとおりである。[0008] The present invention has been made based on the above findings, and the gist thereof is as follows.
【０００９】（１）耐火性の酸化物、バインダ、有機系
糊剤および分散媒から構成されたコーティング剤におい
て、粒子径１０〜２００ｎｍの超微粒子の耐火性の酸化
物を有機系糊剤および分散を除く配合量で５０〜８０重
量％含有し、該超微粒子中のＭｇＯを配合量で４０〜８
０重量％含有することを特徴とする連続鋳造用浸漬ノズ
ルのコーティング剤。(1) In a coating agent comprising a refractory oxide, a binder, an organic paste and a dispersion medium, an ultrafine refractory oxide having a particle diameter of 10 to 200 nm is dispersed in an organic paste and a dispersion agent. 50 to 80% by weight in the blending amount except for MgO in the ultrafine particles in a blending amount of 40 to 8%.
A coating agent for an immersion nozzle for continuous casting, characterized by containing 0% by weight.
【００１０】（２）超微粒子の主成分であるＭｇＯを除
く耐火性の酸化物がＭｎＯ、ＳｉＯ2 、Ｎａ2 Ｏ、Ｋ2
Ｏ、Ｆｅ2 Ｏ3 、Ａｌ2 Ｏ3 、ＴｉＯ2 、ＣａＯ、Ｙ2
Ｏ3、ＺｒＯ2 の内の１種以上であることを特徴とする
上記（１）に連続鋳造用浸漬ノズルのコーティング剤。[0010] (2) MnO, SiO 2 , Na 2 O, K 2
O, Fe 2 O 3 , Al 2 O 3 , TiO 2 , CaO, Y 2
The coating agent for an immersion nozzle for continuous casting according to (1), wherein the coating agent is at least one of O 3 and ZrO 2 .
【００１１】（３）超微粒子の耐火性の酸化物の内、Ｆ
ｅ2 Ｏ3 、Ａｌ2 Ｏ3 、ＴｉＯ2 の１種以上の合計配合
量が有機系糊剤および分散媒を除く配合量で１０重量％
未満であることを特徴とする上記（２）に記載の連続鋳
造用浸漬ノズルのコーティング剤。(3) Among the refractory oxides of ultrafine particles, F
The total amount of at least one of e 2 O 3 , Al 2 O 3 and TiO 2 is 10% by weight in terms of the amount excluding the organic paste and the dispersion medium.
The coating agent for the immersion nozzle for continuous casting according to the above (2), wherein the coating agent is less than.
【００１２】[0012]
【発明の実施の形態】本発明のコーティング剤は耐火性
の酸化物、バインダ、有機系糊剤および分散媒から構成
される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The coating agent of the present invention comprises a refractory oxide, a binder, an organic paste and a dispersion medium.
【００１３】耐火性の酸化物は、粒径１〜１００μｍの
粉体である溶融シリカ、珪砂、長石およびカオリン等が
使用できる。As the refractory oxide, fused silica, silica sand, feldspar, kaolin and the like, which are powders having a particle size of 1 to 100 μm, can be used.
【００１４】耐火性の酸化物に、必要に応じて粒径が１
〜１００μｍのＳｉＣもしくはＳｉ3 Ｎ4 を有機系糊剤
および分散媒を除く配合量で２０重量％（以下、単に％
で重量％を示す）未満の範囲で配合することができる。
これらは、浸漬ノズル昇熱過程で溶融してシリケイトの
被膜となって本体材質を保護するが、２０％以上である
と被膜全体の垂れ落ちが顕著となり、被膜の機能は失わ
れるため、ＳｉＣもしくはＳｉ3 Ｎ4 は約１０％が適当
である。The refractory oxide has a particle size of 1 if necessary.
20 wt% of SiC or Si 3 N 4 of ~100μm in amounts excluding organic sizing agent and the dispersion medium (hereinafter, simply%
(% By weight).
These are melted in the heating process of the immersion nozzle to form a silicate film and protect the body material. However, if the content is more than 20%, dripping of the entire film becomes remarkable, and the function of the film is lost. About 10% of Si 3 N 4 is appropriate.
【００１５】上記耐火性の酸化物に加えて、コーティン
グ剤に粒子径１０〜２００ｎｍの超微粒子の酸化物を有
機系糊剤および分散媒を除く配合量で５０〜８０％含有
させることにより、化学的に安定な被膜を形成でき、し
かも形成被膜の表面を凹凸の小さい平滑面にすることが
できる。In addition to the above-mentioned refractory oxide, the coating agent contains 50 to 80% of ultrafine oxide having a particle diameter of 10 to 200 nm in a compounding amount excluding the organic paste and the dispersing medium. Thus, a stable film can be formed, and the surface of the formed film can be made a smooth surface with small unevenness.
【００１６】しかし、超微粒子の粒子径が２００ｎｍ超
えると、形成被膜の凹凸が大きくなり、溶鋼浸漬面にお
いてアルミナクラスタ等の付着が起こり易くなる。ま
た、焼結性が低下するため多量のバインダを要する。さ
らに、分散媒中では沈降しやすくて均一な塗布処理が困
難となる。また、１０ｎｍ未満の超微粒子は大気中で瞬
時に凝集して超微粒子としての効果が発揮できない。超
微粒子の好ましい粒子径の範囲は、２０〜１００ｎｍで
ある。However, if the particle diameter of the ultrafine particles exceeds 200 nm, the formed film has large irregularities, and adhesion of alumina clusters and the like to the molten steel immersion surface is likely to occur. Further, a large amount of binder is required because sinterability is reduced. Furthermore, it tends to settle in the dispersion medium, making it difficult to perform a uniform coating treatment. Further, ultrafine particles having a diameter of less than 10 nm are instantaneously aggregated in the air and cannot exhibit the effect as ultrafine particles. The preferred range of the particle size of the ultrafine particles is from 20 to 100 nm.
【００１７】超微粒子のＭｇＯの配合量は、有機系糊剤
および分散を除く、各成分の合計量に対して４０〜８０
％が適当である。理由は、４０％未満では、化学的に安
定な被膜を形成できず、剥離が起き易いからであり、８
０％を超えると安定な被膜を形成する効果が飽和するか
らである。The amount of the ultrafine particles of MgO is 40 to 80 with respect to the total amount of each component excluding the organic paste and dispersion.
% Is appropriate. The reason is that if it is less than 40%, a chemically stable film cannot be formed and peeling is likely to occur.
If it exceeds 0%, the effect of forming a stable film is saturated.
【００１８】超微粒子の耐火性の酸化物は、好ましく
は、上記ＭｇＯを主成分として、その他、ＭｎＯ、Ｓｉ
Ｏ2 、Ｎａ2 Ｏ、Ｋ2 Ｏ、Ｆｅ2 Ｏ3 、Ａｌ2 Ｏ3 、Ｔ
ｉＯ2、ＣａＯ、Ｙ2 Ｏ3 、およびＺｒＯ2 から成る群
から選んだ１種もしくは２種以上の組合わせからなる混
合物を使用する。The refractory oxide of the ultrafine particles preferably contains the above-mentioned MgO as a main component, and further contains MnO, Si
O 2 , Na 2 O, K 2 O, Fe 2 O 3 , Al 2 O 3 , T
A mixture of one or a combination of two or more selected from the group consisting of iO 2 , CaO, Y 2 O 3 , and ZrO 2 is used.
【００１９】上記超微粒子の耐火性の酸化物の内で、Ｆ
ｅ2 Ｏ3 、Ａｌ2 Ｏ3 、ＴｉＯ2 は、合計配合量で１０
％未満の範囲で使用できる。これらの成分は、合計配合
量で１０％以上になると連続鋳造用浸漬ノズルの内・外
管面の耐火物を劣化（酸化、侵食）させるため連続操業
上好ましくない。Among the refractory oxides of the ultrafine particles, F
e 2 O 3 , Al 2 O 3 , and TiO 2 are 10
% Can be used. If the total content of these components is 10% or more, refractories on the inner and outer tube surfaces of the continuous casting immersion nozzle are deteriorated (oxidized and eroded), which is not preferable for continuous operation.
【００２０】ＣａＯ、Ｙ2 Ｏ3 、ＺｒＯ2 は、ＭｇＯの
耐食性向上に有効である。しかしながら、経済性を勘案
すると合計配合量は５％程度とするのが好ましい。CaO, Y 2 O 3 and ZrO 2 are effective for improving the corrosion resistance of MgO. However, in consideration of economy, it is preferable that the total compounding amount is about 5%.
【００２１】バインダは、硼酸塩、珪酸ソ−ダ系塩（水
ガラス）、シリコンオイル、板ガラス粉、アルミナセメ
ント等およびその混合物を用いる。バインダの配合量は
２０％未満が適当であり、下限値は５％である。As the binder, borate, sodium silicate salt (water glass), silicon oil, plate glass powder, alumina cement, or a mixture thereof is used. The amount of the binder is suitably less than 20%, and the lower limit is 5%.
【００２２】有機系糊剤は、ポリビニルアルコ−ル（Ｐ
ＶＡともいう）、デキストリン等の糊、蔗糖、糖蜜等の
糖類、およびメチルセルロ−ス（ＭＣともいう）等の水
溶性有機物を用いるとよい。有機系糊剤の溶解、混合方
法は、所定量の分散媒で攪拌混合すればよい。混合粒子
が凝集しやすい場合には、超音波を掛けて分散媒中の気
泡を除去すると凝集を防止でき効果的である。The organic paste is polyvinyl alcohol (P
VA), dextrin and the like, sucrose, molasses and other saccharides, and water-soluble organic substances such as methylcellulose (also referred to as MC). The method for dissolving and mixing the organic paste may be stirring and mixing with a predetermined amount of a dispersion medium. In the case where the mixed particles are likely to aggregate, it is effective to remove the bubbles in the dispersion medium by applying ultrasonic waves to prevent aggregation.
【００２３】分散媒は水が使用できる。水の他に、アル
コール類またはエステル類等が使用できる。分散媒の使
用量は、塗布手段、施工方法によって任意に決められ
る。Water can be used as the dispersion medium. Besides water, alcohols or esters can be used. The amount of the dispersion medium used is arbitrarily determined depending on the application means and the construction method.
【００２４】被覆処理の施工方法は、混合液への浸漬、
スプレイノズルによる吹き付け、刷毛塗り、減圧槽内で
の含浸、電着塗装方式等であればよい。これらの施工方
法を変えて多層に被覆する方式でもよい。The coating method is performed by immersion in a mixed solution,
Spraying with a spray nozzle, brushing, impregnation in a decompression tank, an electrodeposition coating method and the like may be used. A method in which these construction methods are changed and a multi-layer coating may be used.
【００２５】[0025]
【実施例】（実施例１）各種コーティング剤を調合して
炭素含有耐火物に塗布して所要温度で熱処理して被覆効
果を調査した。表１は、試験に使用した各種コーティン
グ剤の配合構成と評価試験結果を示す。EXAMPLES (Example 1) Various coating agents were prepared, applied to a carbon-containing refractory, and heat-treated at a required temperature to examine the coating effect. Table 1 shows the composition of the various coating agents used in the test and the results of the evaluation test.
【００２６】[0026]
【表１】 [Table 1]
【００２７】比較例１および２のコーティング剤は、有
機系糊剤としてＰＶＡを、分散媒として水を使用してＰ
ＶＡ３％水溶液を作製し、この水溶液中に表中に示す粒
径１０〜７４μｍの各種基材粉体とバインダを所定量配
合し、分散させてスラリ−状としたものである。The coating agents of Comparative Examples 1 and 2 were prepared using PVA as an organic paste and water as a dispersion medium.
A 3% aqueous VA solution was prepared, and various amounts of base powder having a particle size of 10 to 74 μm shown in the table and a binder were blended in a predetermined amount in this aqueous solution and dispersed to form a slurry.
【００２８】本発明例１〜５のコーティング剤は、有機
系糊剤としてＰＶＡを、分散媒として水を使用して２．
７５％水溶液を作製し、この水溶液中に粒径５〜７４μ
ｍの各種基材粉体、粒径２０〜１７０ｎｍの超微粒子の
耐火性の各種酸化物との混合粉体および粒径１〜２０μ
ｍのバインダを所定量配合し、分散させてスラリ−状と
したものである。The coating agents of Examples 1 to 5 of the present invention use PVA as an organic paste and water as a dispersion medium.
A 75% aqueous solution is prepared, and the particle size is 5 to 74 μm in this aqueous solution.
m, various base powders, mixed powders of ultrafine particles having a particle size of 20 to 170 nm with various refractory oxides, and particle sizes of 1 to 20 μm
A predetermined amount of binder m is mixed and dispersed to form a slurry.
【００２９】アルミナ−炭素系（Ａｌ2 Ｏ3 ：５０％、
Ｃ：２５％）の材料から切り出した内径φ２０ｍｍ、外
径φ６０ｍｍ、高さ６０ｍｍの円筒形状の被覆試験片の
全面に上記スラリ−状に調整したコーティング剤を刷毛
塗りし、１１５℃で２０時間乾燥した。この後に被覆試
験片を温度５００〜１５００℃のそれぞれの温度で２０
０分間加熱処理を行い、処理温度別の減量率と表面状態
を調査した。なお、減量率は、下記式から求めた。Alumina-carbon system (Al 2 O 3 : 50%,
C: 25%) The above slurry-adjusted coating agent is brush-coated on the entire surface of a cylindrical coated test piece having an inner diameter of 20 mm, an outer diameter of 60 mm, and a height of 60 mm cut from a material of 25% and dried at 115 ° C. for 20 hours. did. After this, the coated specimens are subjected to a temperature of 500 to 1500 ° C. for 20 minutes.
Heat treatment was performed for 0 minutes, and the weight loss rate and the surface condition at each treatment temperature were examined. The weight loss rate was determined from the following equation.
【００３０】（被覆試験片の加熱処理前の重量−被覆試
験片の加熱処理後の重量）×１００／被覆試験片の加熱
処理前の重量（％）。(Weight of coated test piece before heat treatment-weight of coated test piece after heat treatment) × 100 / weight (%) of coated test piece before heat treatment.
【００３１】また、表中の（剥離）等の記載は、各種コ
ーティング剤により形成された被膜の加熱処理時におけ
る観察結果の特記を示す。Further, the description of (peeling) and the like in the table shows special observation results of the heat treatment of the film formed by various coating agents.
【００３２】表１の評価試験結果に示すように、比較例
１では、１５００℃の処理温度で被膜の剥離が生じ、比
較例２では５００℃で被膜の剥離が生じ、１５００℃以
上の処理温度で被膜の垂れ落ちまたは球滴化が生じて安
定した被膜の形成ができなかった。As shown in the evaluation test results in Table 1, in Comparative Example 1, the coating peeled off at a processing temperature of 1500 ° C., and in Comparative Example 2, the coating peeled off at 500 ° C., and the processing temperature of 1500 ° C. or more. As a result, the film was dripped or formed into spherical drops, and a stable film could not be formed.
【００３３】これに対して本発明例１〜５のコーティン
グ剤では広い温度範囲で被膜の剥離等の問題が発生しな
いだけではなく、減量率も比較例１および２に比較して
小さかった。また、形成被膜表面を観察したところ、本
発明例１〜５の被覆試験片の表面は、比較例１および２
に比べて凹凸の小さい平滑面であった。On the other hand, the coating agents of Examples 1 to 5 of the present invention not only did not cause a problem such as peeling of the film over a wide temperature range, but also had a smaller weight loss rate as compared with Comparative Examples 1 and 2. Further, when the surface of the formed coating film was observed, the surfaces of the coated test pieces of Examples 1 to 5 of the present invention were found to be Comparative Examples 1 and 2.
It was a smooth surface with small irregularities as compared with.
【００３４】（実施例２）図１（ａ）、（ｂ）は、本実
施例２で使用した浸漬ノズルの概略図を示す。同図に示
す浸漬ノズルの内・外管面に、実施例１で使用した本発
明例１のコーティング剤を刷毛塗りし、比較例１のコー
ティング剤も同様に同一ロットの浸漬ノズルの内・外管
面に刷毛塗りし、共に１０５℃で乾燥して被覆処理し
た。さらに、１２００℃まで昇熱後１００分間、１００
０℃で保温して放冷して熱処理後の酸化状況を調査し
た。Example 2 FIGS. 1A and 1B are schematic views of an immersion nozzle used in Example 2. FIG. The coating agent of Example 1 of the present invention used in Example 1 was brush-coated on the inner and outer tube surfaces of the immersion nozzle shown in the same figure, and the coating agent of Comparative Example 1 was similarly applied to the inner and outer immersion nozzles of the same lot. The tube was brush-coated and dried at 105 ° C. for coating. Further, after heating to 1200 ° C., 100 minutes
The temperature was kept at 0 ° C., the mixture was allowed to cool, and the oxidation state after the heat treatment was examined.
【００３５】なお、浸漬ノズル本体１の部材はアルミナ
−グラファイト質、溶鋼浸漬域部材２はアルミナ−グラ
ファイト質、およびパウダ−ライン部材３はジルコニア
−グラファイト質を使用して試験を実施した。The test was carried out using alumina-graphite as the material of the immersion nozzle body 1, using alumina-graphite as the molten steel immersion zone member 2, and using zirconia-graphite as the powder line member 3.
【００３６】この結果、比較例１のコーティング剤の場
合、浸漬ノズルの内管面では部分的な剥離と酸化が進行
し、浸漬ノズルの外管面で被膜の球滴化が起こり、酸化
も進行した。As a result, in the case of the coating agent of Comparative Example 1, partial peeling and oxidation proceeded on the inner tube surface of the immersion nozzle, and the film became spherical and oxidized on the outer tube surface of the immersion nozzle. did.
【００３７】本発明例１のコーティング剤では、浸漬ノ
ズルの内管面および外管面とも全く被膜の剥離・球滴化
等の問題が発生しなかったし、酸化も進行しなかった。The coating agent of Example 1 of the present invention did not cause any problems such as peeling of the coating and spheroidization on the inner tube surface and the outer tube surface of the immersion nozzle, and oxidation did not proceed.
【００３８】（実施例３）図２（ａ）、（ｂ）は、本実
施例３で使用した浸漬ノズルの概略図を示す。(Embodiment 3) FIGS. 2A and 2B are schematic views of the immersion nozzle used in Embodiment 3. FIG.
【００３９】同図に示す浸漬ノズルの内・外管面に、実
施例１で使用した本発明例２のコーティング剤を刷毛塗
りし、比較例２のコーティング剤も同様に同一ロットの
浸漬ノズルの内・外管面に刷毛塗りし、実炉試験を行っ
た。The inner and outer tube surfaces of the immersion nozzle shown in the same figure were brush-coated with the coating agent of Example 2 of the present invention used in Example 1, and the coating agent of Comparative Example 2 was similarly coated with the immersion nozzle of the same lot. Brushing was applied to the inner and outer tube surfaces, and an actual furnace test was performed.
【００４０】試験した実炉は容量７５トンのスラブ用２
ストランドタンデシュで、使用した溶鋼４はいわゆるア
ルミキルドした極低炭素鋼である。それぞれのストラン
ドに本発明例２のコーティング剤を塗布した浸漬ノズル
と比較例２のコーティング剤を塗布した浸漬ノズルとを
設置して鋳込み温度１５５７℃、鋳込み速度１．７ｍ／
ｍｉｎで連続鋳造した。The actual furnace tested was a 75 ton capacity slab 2
In the strand tandem, the molten steel 4 used is a so-called aluminum-killed ultra-low carbon steel. An immersion nozzle in which the coating agent of the present invention example 2 was applied to each strand and an immersion nozzle in which the coating agent of Comparative Example 2 was applied were installed at a casting temperature of 1557 ° C and a casting speed of 1.7 m /.
min.
【００４１】なお、浸漬ノズル本体１の部材はアルミナ
−グラファイト質、溶鋼浸漬域部材２はアルミナ−グラ
ファイト質、パウダ−ライン部材３はジルコニア−グラ
ファイト質、および浸漬ノズル内管部材６はアルミナ−
マグネシア質を使用して試験を実施した。The immersion nozzle body 1 is made of alumina-graphite, the molten steel immersion zone member 2 is made of alumina-graphite, the powder line member 3 is made of zirconia-graphite, and the immersion nozzle inner tube member 6 is made of alumina-graphite.
The test was performed using magnesia.
【００４２】この結果、比較例２のコーティング剤を塗
布した浸漬ノズルでは４ｃｈ目に湯面変動が発生して５
ｃｈ目に鋳込み速度を１．４ｍ／ｍｉｎに引き下げて終
了させた。As a result, in the immersion nozzle to which the coating agent of Comparative Example 2 was applied, the level of
The casting speed was lowered to 1.4 m / min at the ch-th end.
【００４３】一方、本発明例２のコーティング剤を塗布
した浸漬ノズルは、湯面変動等のトラブルがなく、６ｃ
ｈ目以降は１．８５ｍ／ｍｉｎに速度を上げて予定した
７ｃｈの連々指数で操業を終了できた。On the other hand, the immersion nozzle coated with the coating agent of Example 2 of the present invention has no troubles such as fluctuations in the molten metal level,
After the h-th operation, the operation was completed at the scheduled index of 7 ch by increasing the speed to 1.85 m / min.
【００４４】[0044]
【発明の効果】本発明のコーティング剤を使用すること
により、連続鋳造用浸漬ノズルの内・外管面に化学的に
安定な酸化物を形成し、形成した酸化物の被膜を凹凸の
小さい平滑面にすることができ、従来問題になっていた
被膜の剥離、垂れ落ちまたは球滴化等の問題を低減でき
る。By using the coating agent of the present invention, a chemically stable oxide is formed on the inner and outer pipe surfaces of the continuous casting immersion nozzle, and the formed oxide film is smoothed with small unevenness. It is possible to reduce the problems such as peeling, dripping or spheroidization of the coating, which have been problems in the past.
【図１】実施例２で使用した連続鋳造用浸漬ノズルを示
し、図１（ａ）は縦断面を示し、図１（ｂ）は、図１
（ａ）のＡ部の拡大図を示す。FIG. 1 shows a continuous casting immersion nozzle used in Example 2, FIG. 1 (a) shows a vertical cross section, and FIG.
An enlarged view of a portion A of (a) is shown.
【図２】実施例３で使用した連続鋳造用浸漬ノズルを示
し、図２（ａ）は縦断面を示し、図２（ｂ）は、図２
（ａ）のＢ部の拡大図を示す。の縦断面を示す。2 shows a continuous casting immersion nozzle used in Example 3, FIG. 2 (a) shows a longitudinal section, and FIG. 2 (b) shows FIG.
An enlarged view of a B part of (a) is shown. 1 shows a vertical cross section of FIG.
１：浸漬ノズル本体、 ２：溶鋼浸漬域部材、 ３：パウダ−ライン部材、 ４：溶鋼、 ５：溶融パウダ−層、 ６：浸漬ノズル内管部材、 ７：実施例２で使用したコーティング剤により形成され
た被膜、 ８：実施例３で使用したコーティング剤により形成され
た被膜。1: immersion nozzle body, 2: molten steel immersion zone member, 3: powder line member, 4: molten steel, 5: molten powder layer, 6: immersion nozzle inner tube member, 7: by coating agent used in Example 2 Formed film 8: Film formed by the coating agent used in Example 3.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4E014 DA00 DA01 DB03 4G030 AA03 AA04 AA07 AA08 AA12 AA16 AA17 AA25 AA27 AA36 AA37 AA60 BA29 GA07 GA14 GA16 PA25 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 4E014 DA00 DA01 DB03 4G030 AA03 AA04 AA07 AA08 AA12 AA16 AA17 AA25 AA27 AA36 AA37 AA60 BA29 GA07 GA14 GA16 PA25
Claims (3)
および分散媒から構成されたコーティング剤において、
粒子径１０〜２００ｎｍの超微粒子の耐火性の酸化物を
有機系糊剤および分散を除く配合量で５０〜８０重量％
含有し、該超微粒子中のＭｇＯを配合量で４０〜８０重
量％含有することを特徴とする連続鋳造用浸漬ノズルの
コーティング剤。1. A coating composition comprising a refractory oxide, a binder, an organic paste and a dispersion medium,
50 to 80% by weight of a refractory oxide of ultrafine particles having a particle diameter of 10 to 200 nm in a compounding amount excluding the organic paste and dispersion.
A coating agent for an immersion nozzle for continuous casting, comprising 40 to 80% by weight of MgO in the ultrafine particles in a blending amount.
火性の酸化物がＭｎＯ、ＳｉＯ2 、Ｎａ2 Ｏ、Ｋ2 Ｏ、
Ｆｅ2 Ｏ3 、Ａｌ2 Ｏ3 、ＴｉＯ2 、ＣａＯ、Ｙ2 Ｏ
3 、ＺｒＯ2 の内の１種以上であることを特徴とする請
求項１に記載の連続鋳造用浸漬ノズルのコーティング
剤。2. A refractory oxide other than MgO, which is a main component of ultrafine particles, comprises MnO, SiO 2 , Na 2 O, K 2 O,
Fe 2 O 3 , Al 2 O 3 , TiO 2 , CaO, Y 2 O
3, coating agents immersion nozzle according to claim 1, characterized in that at least one of the ZrO 2.
Ｏ3 、Ａｌ2 Ｏ3 、ＴｉＯ2 の１種以上の合計配合量が
有機系糊剤および分散媒を除く配合量で１０重量％未満
であることを特徴とする請求項２に記載の連続鋳造用浸
漬ノズルのコーティング剤。3. Among the ultrafine refractory oxides, Fe 2
3. The continuous casting according to claim 2, wherein the total amount of at least one of O 3 , Al 2 O 3 , and TiO 2 is less than 10% by weight excluding the organic sizing agent and the dispersion medium. Coating agent for immersion nozzles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11145454A JP2000334550A (en) | 1999-05-25 | 1999-05-25 | Coating agent of immersion nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11145454A JP2000334550A (en) | 1999-05-25 | 1999-05-25 | Coating agent of immersion nozzle for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000334550A true JP2000334550A (en) | 2000-12-05 |
Family
ID=15385613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11145454A Withdrawn JP2000334550A (en) | 1999-05-25 | 1999-05-25 | Coating agent of immersion nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000334550A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020076066A (en) * | 2001-03-27 | 2002-10-09 | 주식회사 포스코 | Unshaped refractories for wet-type gunning and gunning method |
| KR100483132B1 (en) * | 2001-10-29 | 2005-04-14 | 조선내화 주식회사 | porous and nozzle refractories comprising imbibition-preventing layers and low melting material-forming layers |
| EP1541260A1 (en) * | 2002-08-22 | 2005-06-15 | Krosakiharima Corporation | Method for continuous casting of molten steel for thin sheet |
| JP2007051015A (en) * | 2005-08-15 | 2007-03-01 | National Institute Of Advanced Industrial & Technology | Small diameter flow pipe and method of manufacturing the same |
| WO2013081113A1 (en) * | 2011-12-01 | 2013-06-06 | 黒崎播磨株式会社 | Refractory and nozzle for casting |
| JP2017042785A (en) * | 2015-08-26 | 2017-03-02 | 品川リフラクトリーズ株式会社 | Dipping nozzle for continuous casting |
-
1999
- 1999-05-25 JP JP11145454A patent/JP2000334550A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020076066A (en) * | 2001-03-27 | 2002-10-09 | 주식회사 포스코 | Unshaped refractories for wet-type gunning and gunning method |
| KR100483132B1 (en) * | 2001-10-29 | 2005-04-14 | 조선내화 주식회사 | porous and nozzle refractories comprising imbibition-preventing layers and low melting material-forming layers |
| EP1541260A1 (en) * | 2002-08-22 | 2005-06-15 | Krosakiharima Corporation | Method for continuous casting of molten steel for thin sheet |
| EP1541260A4 (en) * | 2002-08-22 | 2006-05-17 | Krosakiharima Corp | Method for continuous casting of molten steel for thin sheet |
| JP2007051015A (en) * | 2005-08-15 | 2007-03-01 | National Institute Of Advanced Industrial & Technology | Small diameter flow pipe and method of manufacturing the same |
| WO2013081113A1 (en) * | 2011-12-01 | 2013-06-06 | 黒崎播磨株式会社 | Refractory and nozzle for casting |
| AU2012343466B2 (en) * | 2011-12-01 | 2015-02-12 | Krosakiharima Corporation | Refractory and nozzle for casting |
| JP2017042785A (en) * | 2015-08-26 | 2017-03-02 | 品川リフラクトリーズ株式会社 | Dipping nozzle for continuous casting |
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