JPH10166117A - Nozzle for continuous casting - Google Patents
Nozzle for continuous castingInfo
- Publication number
- JPH10166117A JPH10166117A JP8342598A JP34259896A JPH10166117A JP H10166117 A JPH10166117 A JP H10166117A JP 8342598 A JP8342598 A JP 8342598A JP 34259896 A JP34259896 A JP 34259896A JP H10166117 A JPH10166117 A JP H10166117A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- nozzle
- inner hole
- continuous casting
- refractory
- 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.)
- Granted
Links
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- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はアルミニウムを含有
するアルミキルド鋼等の連続鋳造において溶鋼が通過す
るノズルの狭さく、さらには閉塞を効果的に抑制するこ
とができる連続鋳造用ノズルに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting nozzle capable of effectively suppressing clogging of a nozzle through which molten steel passes in continuous casting of aluminum-killed steel or the like containing aluminum and further effectively suppressing blockage.
【０００２】[0002]
【従来の技術】溶鋼の連続鋳造用ノズルは、次のような
目的のために使用される。2. Description of the Related Art A nozzle for continuous casting of molten steel is used for the following purposes.
【０００３】溶鋼の連続鋳造において連続鋳造用ノズル
はタンディッシュモールド間の溶鋼注入で溶鋼の空気と
の接触による酸化を防ぎ、又溶鋼の飛散防止を計り、さ
らには非金属介在物及びモールド面浮遊物の鋳片への巻
き込み防止のための注湯の整流化などの目的で使用され
ている。[0003] In continuous casting of molten steel, a continuous casting nozzle is used to prevent oxidation of molten steel caused by contact with air by injection of molten steel between tundish molds, to prevent scattering of molten steel, and to prevent nonmetallic inclusions and mold surface floating. It is used for the purpose of rectifying pouring of molten metal to prevent the product from getting into the slab.
【０００４】従来溶鋼の連続鋳造用ノズル材質は、主と
して黒鉛，アルミナ，シリカ，シリコンカーバイド等で
構成されており、最近ではジルコニアを構成成分として
用いられる場合がある。しかしながらアルミキルド鋼等
を鋳造する場合は次のような問題点を有している。Conventionally, the nozzle material for continuous casting of molten steel is mainly composed of graphite, alumina, silica, silicon carbide and the like, and recently zirconia is sometimes used as a constituent component. However, casting aluminum killed steel or the like has the following problems.
【０００５】アルミキルド鋼等は脱酸剤として添加され
るアルミニウムが溶鋼中に存在する酸素と反応してα−
アルミナ等の非金属介在物が生成する。そのためアルミ
キルド鋼等を鋳造する際、連続鋳造用ノズルの内孔表面
に脱酸剤として添加されるアルミニウムの酸化により生
成されるα−アルミナ等の非金属介在物が付着し、そし
て堆積してその結果内孔が狭さくし最悪の場合、内孔を
閉塞してしまい安定的な鋳造を困難にする。あるいはこ
のようにして付着し堆積したα−アルミナ等の非金属介
在物が剥離或いは脱落して鋳片に巻き込まれ鋳片の品質
低下を招く。In aluminum-killed steel and the like, aluminum added as a deoxidizer reacts with oxygen present in molten steel to form α-killed steel.
Non-metallic inclusions such as alumina are formed. Therefore, when casting aluminum killed steel, etc., non-metallic inclusions such as α-alumina generated by oxidation of aluminum added as a deoxidizing agent adhere to the inner hole surface of the continuous casting nozzle, and are deposited and deposited. As a result, the inner hole is narrowed, and in the worst case, the inner hole is closed, which makes stable casting difficult. Alternatively, the non-metallic inclusions such as α-alumina adhered and deposited in this manner are peeled off or fall off and are caught in the slab, resulting in a deterioration in the quality of the slab.
【０００６】上述したα−アルミナ等の非金属介在物に
よる内孔の狭さく及び閉塞を防止するために内孔を形成
する連続鋳造用ノズルの内面から前記内孔を通って流れ
る溶鋼に向かって不活性ガスを噴射させ、溶鋼中に存在
するα−アルミナ等の非金属介在物が連続鋳造用ノズル
内孔面に付着し堆積することを防止する方法が広く用い
られている。In order to prevent the inner hole from being narrowed and clogged by the non-metallic inclusions such as α-alumina, the inner surface of the continuous casting nozzle for forming the inner hole is difficult to move toward the molten steel flowing through the inner hole. 2. Description of the Related Art A method of injecting an active gas to prevent non-metallic inclusions such as α-alumina present in molten steel from adhering and depositing on the inner surface of a continuous casting nozzle has been widely used.
【０００７】しかしながら上述した内孔を形成する溶鋼
連続鋳造用ノズルの内面から不活性ガスを噴出させる方
法には次のような問題点がある。[0007] However, the method of injecting the inert gas from the inner surface of the molten steel continuous casting nozzle forming the inner hole has the following problems.
【０００８】即ち、噴出させる不活性ガス量が多いと不
活性ガスによってできた気泡が鋳片のなかに巻き込まれ
ピンホールに基づく欠陥が生じる。逆に噴出させる不活
性ガス量が少ないとα−アルミナ等の非金属介在物が連
続鋳造用ノズルの内孔面に付着し堆積して内孔の狭さ
く、さらには最悪の場合閉塞する。That is, if the amount of the inert gas to be jetted is large, bubbles formed by the inert gas are caught in the slab, causing defects due to pinholes. Conversely, if the amount of the inert gas to be ejected is small, non-metallic inclusions such as α-alumina adhere to and accumulate on the inner surface of the continuous casting nozzle, and the inner hole becomes narrower and, in the worst case, clogs.
【０００９】また連続鋳造用ノズルの内面から前記内孔
を通って流れる溶鋼に向かって不活性ガスを均一に吹き
込むことは構造的に不可能であり、また長時間鋳造する
際は連続鋳造用ノズル材質の組織劣化及び構造劣化する
に伴い噴出させる不活性ガスのコントロールが不安定と
なり、さらには不活性ガスを連続鋳造用ノズル内孔面に
均一に噴出させることが困難となり、その結果、α−ア
ルミナ等の非金属介在物が連続鋳造用ノズルの内孔面に
付着し、そして堆積して内孔の狭さく、さらには閉塞し
てしまう。Further, it is structurally impossible to blow an inert gas uniformly from the inner surface of the continuous casting nozzle toward the molten steel flowing through the inner hole. The control of the inert gas to be ejected becomes unstable due to the deterioration of the structure and the structure of the material, and it becomes difficult to evenly eject the inert gas onto the inner surface of the continuous casting nozzle. As a result, α- Non-metallic inclusions such as alumina adhere to the inner surface of the continuous casting nozzle and accumulate to make the inner hole narrower and even clogged.
【００１０】非金属介在物によるノズル閉塞、とくにア
ルミナ介在物によるノズル閉塞は次のようにして生じる
と考えられる。It is considered that nozzle blockage due to nonmetallic inclusions, particularly nozzle blockage due to alumina inclusions, occurs as follows.
【００１１】すなわち（１）鋼中のアルミニウムは耐火
物接合部及び耐火物組織を通しての空気の巻き込みによ
る酸化、カーボンを含んだ耐火物中のシリカは還元反応
により消化し酸素を提供することによる酸化等の二次酸
化によりアルミナを生成する。（２）このアルミナが拡
散、凝集しアルミナ介在物が形成される。（３）ノズル
の稼動面ではカーボンが消失し表面が凹凸状になり、ア
ルミナ介在物が堆積しやすくなる。That is, (1) aluminum in steel is oxidized by entrainment of air through a refractory joint and a refractory structure, and silica in carbon-containing refractory is digested by a reduction reaction and oxidized by providing oxygen. And the like to produce alumina by secondary oxidation. (2) The alumina diffuses and aggregates to form alumina inclusions. (3) On the operating surface of the nozzle, carbon disappears, the surface becomes uneven, and alumina inclusions are easily deposited.
【００１２】一方、材質面からの対策として非酸化物原
料（ＳiＣ，Ｓi3Ｎ4，ＢＮ，ＺｒＢ2，サイアロン等）
はアルミニウム酸化物との反応性が低いことから、非酸
化物原料をアルミナ−黒鉛質に添加もしくはそれ自体か
らなるノズルが提案されている。しかしながら、アルミ
ナ−黒鉛質に添加する場合は、多量に添加しなければ、
付着防止効果が認められず、耐蝕性も劣化することから
実用的ではない。また、非酸化物系の原料のみでノズル
を作成する場合も、その効果が期待できる反面、原料，
製造面のコストから実用には不向きである。On the other hand, non-oxide raw materials (SiC, Si 3 N 4 , BN, ZrB 2 , sialon, etc.) are taken as measures from the material side.
Because of its low reactivity with aluminum oxide, a nozzle has been proposed in which a non-oxide raw material is added to alumina-graphite or made of itself. However, when adding to alumina-graphite, unless it is added in a large amount,
It is not practical because the effect of preventing adhesion is not recognized and the corrosion resistance is deteriorated. Also, when a nozzle is made only of non-oxide-based material, the effect can be expected, but the material,
It is not suitable for practical use due to manufacturing cost.
【００１３】更にパイロフィライトを主成分とするロー
石を添加し、内孔表面にガラス皮膜を生成させ空気の巻
き込みを抑制する方法が提言されている。しかしながら
鋳造中の溶鋼温度条件によりロー石が溶融することが抑
制され空気の遮断が十分に効果しない場合がある。[0013] Further, a method has been proposed in which rhoite containing pyrophyllite as a main component is added to form a glass film on the surface of the inner hole to suppress air entrapment. However, depending on the temperature condition of the molten steel during casting, melting of the rock may be suppressed, and there may be a case where the blocking of air is not sufficiently effective.
【００１４】[0014]
【発明が解決しようとする課題】本発明の目的は、使用
中にノズル稼動面にガラス層が形成し、耐火物組織を通
しての空気の巻き込みの防止と、稼動面組織を平滑化す
ることにより、不活性ガスを噴出させる等の機械的な方
法を用いることなく、また耐火物中の骨材と鋼中のアル
ミナとの反応により低融点化による溶損を促進すること
なく、経済的かつ比較的安易に、また鋳造時の溶鋼の温
度変化に対し影響を受けることなく、安定して内孔の狭
さく、さらには閉塞を防止する連続鋳造用ノズルを提供
することにある。SUMMARY OF THE INVENTION An object of the present invention is to form a glass layer on a nozzle operating surface during use, prevent air from being trapped through a refractory structure, and smoothen the operating surface structure. It is economical and relatively economical without using mechanical methods such as blowing out inert gas, and without promoting melting by lowering the melting point due to the reaction between the aggregate in the refractory and the alumina in the steel. It is an object of the present invention to provide a continuous casting nozzle that can stably narrow an inner hole and prevent clogging easily and without being affected by a change in temperature of molten steel during casting.
【００１５】[0015]
【課題を解決するための手段】本発明は少なくとも溶鋼
と接触する内孔表面部が鉱物組成としてパイロフィライ
トを主成分とするロー石４５〜８５重量％、黒鉛１０〜
３５重量％、炭化けい素１〜１０重量％からなり有機バ
インダーを添加し成形し非酸化雰囲気にて焼成したもの
であることを特徴とする。According to the present invention, at least 45 to 85% by weight of a rock composed mainly of pyrophyllite as a mineral composition and at least 10% of graphite are formed at the surface of an inner hole in contact with molten steel.
It is characterized by comprising 35% by weight, 1-10% by weight of silicon carbide, adding an organic binder, molding and firing in a non-oxidizing atmosphere.
【００１６】また、ロー石は鉱物組成としてパイロフィ
ライト系の天然原料で８００℃以上で仮焼し、結晶水を
飛ばしＫ2Ｏ，Ｎａ2Ｏ等のアルカリ成分１〜５重量％含
むものを使用する。またロー石の粒度は平均粒径２５０
μｍ以下がロー石配合重量比６０％以下であることを特
徴とする。[0016] In addition, the raw stone is a pyrophyllite-based natural raw material having a mineral composition which is calcined at 800 ° C. or higher to remove water of crystallization and contains 1 to 5% by weight of alkali components such as K 2 O and Na 2 O. use. The grain size of the rock is 250
μm or less is characterized by being 60% or less by weight of the raw stone.
【００１７】本発明のもっとも注目すべき点はロー石と
炭化けい素を共用したことにあり炭化けい素共存化での
ロー石はブローティング現象が発現しやすく低温度にお
いても耐火物組織を通しての空気の巻き込みを抑制する
ことができる。The most remarkable point of the present invention is that the rock and the silicon carbide are used in common, and the rock in the coexistence of the silicon carbide is liable to cause a blowing phenomenon, and even at a low temperature, the rock through the refractory structure. Entrainment of air can be suppressed.
【００１８】ロー石の半溶融温度は１５５０℃前後であ
り溶鋼と接触する稼動面においては空気の巻き込みを抑
制していることがロー石のみでは１４５０℃１ｈｒ熱処
理後の通気率が５．３×１０-4ｄａｒｃｙなのに対し炭
化けい素を添加することにより１．０×１０‐4ｄａｒ
ｃｙと小さくなることからわかる。The semi-molten temperature of the rock is about 1550 ° C., and it is found that the entrainment of air is suppressed on the working surface in contact with the molten steel. 10- 4 darcy a whereas by addition of silicon carbide 1.0 × 10- 4 dar
It can be seen from the fact that it is as small as cy.
【００１９】ロー石の配合重量比率は連続鋳造用ノズル
として実使用時において、稼動面にガラス皮膜を積極的
に生成させるためには４５重量％以上が望ましく、また
８５重量％以上では軟化変形が大きくなることから８５
重量％以下が望ましい。In the actual use as a nozzle for continuous casting, the mixing weight ratio of the rock is desirably 45% by weight or more in order to positively generate a glass film on the working surface, and when 85% by weight or more, softening deformation occurs. 85 from growing
% By weight or less is desirable.
【００２０】炭化けい素の配合比率はロー石のブローテ
ィング現象を積極的に生成させるためには１重量％以上
が望ましく１０重量％以上では溶融が著しく溶損を大き
くすることにより１０重量％以下が望ましい。The compounding ratio of silicon carbide is preferably 1% by weight or more, in order to positively generate the blasting phenomenon of the rock, and if it is 10% by weight or more, melting is remarkable and melting loss is increased, so that it is 10% by weight or less. Is desirable.
【００２１】黒鉛の配合重量比率は、ロー石の軟化変形
を抑制するために、また耐熱衝撃性を保持するために１
０重量％以上が望ましく、また３５重量％以上ではロー
石に対し黒鉛の体積比率が大きくなり、ラミネーション
等の組織欠陥を発生しやすく、ノズル製造面上３５重量
％以下が望ましい。また熱伝導率及び耐酸化性を考慮す
れば天然黒鉛を適用することが望ましい。The compounding weight ratio of graphite is 1 in order to suppress the softening deformation of the rock and to maintain the thermal shock resistance.
The content is preferably 0% by weight or more, and if it is 35% by weight or more, the volume ratio of graphite to the rock becomes large, and tissue defects such as lamination are easily generated. In consideration of thermal conductivity and oxidation resistance, it is desirable to use natural graphite.
【００２２】８００℃以上で仮焼し結晶水を飛ばしたロ
ー石を使用する理由はロー石の結晶水の放出は５００〜
８００℃であるためであり、この時、熱膨脹率が異常に
大きくなり、耐火物に亀裂が入るためである。The reason for using the calcite that has been calcined at 800 ° C. or more to remove crystallization water is that the crystallization water of the rubble is released from 500 to
At 800 ° C., the coefficient of thermal expansion becomes abnormally large and cracks occur in the refractory.
【００２３】ロー石の粒度は平均粒径２５０μｍ以下が
ロー石配合重量比の６０％以上の場合、成形時のラミネ
ーション等の組織欠陥を生じやすく、また連続鋳造用ノ
ズルとしての実使用時においては、ロー石粒子の軟化変
形が生じやすいため６０％以下が望ましい。When the average particle size of the rock stone is 250 μm or less and the weight ratio of the rock stone is 60% or more, structural defects such as lamination at the time of molding are liable to occur, and in actual use as a continuous casting nozzle. Since the softening deformation of the rock particles easily occurs, the content is preferably 60% or less.
【００２４】ロー石の種類としてはパイロフィライト質
ロー石，カオリン質ロー石，セリサイト質ロー石の三種
類いずれも使用できるが、実使用時に溶鋼と接触する稼
動面が半溶融化しガラス層の形成と溶鋼との耐溶損性を
考えると耐火度ＳＫ２９〜３２のパイロフィライト質ロ
ー石が良好である。カオリン質ロー石では耐火度がＳＫ
３３〜３６と高く、逆にセリサイト質ロー石では耐火度
ＳＫ２６〜２９と低い。Any of three types of lozenges, pyrophyllite lozenges, kaolinite lozenges, and sericite lozenges, can be used. Considering the formation of steel and the erosion resistance of molten steel, pyrophyllite-based rock with a fire resistance of SK29 to 32 is good. The fire resistance of kaolinite rock is SK
It is as high as 33 to 36, and conversely, in the case of sericite rock, the fire resistance is SK26 to 29, which is low.
【００２５】（作用）パイロフィライトを主成分とする
ロー石４５〜８５重量％黒鉛１０〜３５重量％炭化けい
素１〜１０重量％からなる耐火物組成は黒鉛及びカーボ
ン共存化においてもロー石粒の消化分解はなくＳｉＯ2
の様な鋼中への酸素供給源にはならない。またロー石の
半溶融温度は１５００℃前後であり、溶鋼と接触する稼
動面においてガラス皮膜を成形し、稼動面組織を平滑に
し、かつ、耐火物を通しての空気の巻き込みを抑制する
ことからＡｌ2Ｏ3及びメタルの付着を抑制する効果があ
る。次に本発明の溶鋼連続鋳造用ノズル図面を参照しな
がら説明する。図１は、本発明の浸漬ノズルとしての溶
鋼連続鋳造用ノズルの実施態様を示す概略垂直断面の一
例である。実施態様の溶鋼連続鋳造用ノズル３は、タン
ディッシュとモールドとの間に配置されている浸漬ノズ
ルとして使用される。図１に示すようにそれを通って溶
鋼が流れる内孔１をその軸線に沿って有する浸漬ノズル
としての溶鋼連続鋳造用ノズル３において、前記内孔１
を形成する前記溶鋼連続鋳造用ノズル３の内孔表層部２
は、上述した化学成分組成を有する耐火物によって形成
されている。実施態様の浸漬ノズルとしての溶鋼連続鋳
造用ノズル３によると内孔１を形成する溶鋼連続鋳造用
ノズル３の内孔表層部２に溶鋼中に存在するアルミナ等
の非金属介在物が付着しそして堆積することを抑制す
る。(Function) A refractory composition comprising 45 to 85% by weight of fluorite mainly composed of pyrophyllite and 10 to 35% by weight of graphite and 1 to 10% by weight of silicon carbide can be used in the coexistence of graphite and carbon. No digestion and decomposition of grains and SiO 2
It does not provide a source of oxygen into the steel as in. The semi-molten temperature of roseki is around 1500 ° C., and forming glass film in working surface in contact with molten steel, to smooth the operation surface tissue, and, Al 2 from suppressing entrainment of air through the refractory It has the effect of suppressing the adhesion of O 3 and metal. Next, the nozzle for continuous casting of molten steel of the present invention will be described with reference to the drawings. FIG. 1 is an example of a schematic vertical cross section showing an embodiment of a nozzle for continuous casting of molten steel as an immersion nozzle of the present invention. The nozzle 3 for continuous casting of molten steel of the embodiment is used as an immersion nozzle disposed between a tundish and a mold. As shown in FIG. 1, a continuous casting nozzle 3 for molten steel as an immersion nozzle having an inner hole 1 along the axis thereof through which molten steel flows.
Inner surface layer 2 of the nozzle 3 for continuous casting of molten steel forming
Is formed of a refractory having the chemical composition described above. According to the molten steel continuous casting nozzle 3 as the immersion nozzle of the embodiment, nonmetallic inclusions such as alumina existing in the molten steel adhere to the inner surface layer 2 of the molten steel continuous casting nozzle 3 forming the inner hole 1. Suppress deposition.
【００２６】次に実施例を挙げ、本発明を説明する。Next, the present invention will be described with reference to examples.
【００２７】[0027]
【実施例】表１に示す本発明の範囲内の化学成分組成を
有する配合物１から５（以下“本発明のサンプル”とい
う）及び本発明の範囲外の化学成分組成を有する配合物
６〜８（以下“比較サンプル”という）の各々に５から
１０重量％の範囲内の粉末及び溶液のフェノール樹脂を
添加し、それらを混合及び混練して得られた原料坏土に
よって、アルミナ等の非金属介在物の付着量及び溶鋼に
対する耐蝕性を試験するための３０ｍｍ×３０ｍｍ×２
３０ｍｍの寸法を有する成形体及び通気率を測定するた
めのφ５０ｍｍ×２０ｍｍの寸法を有する成形体及び、
耐スポーリング性を試験するための外径１００ｍｍ，内
径６０ｍｍ及び長さ２５０ｍｍの寸法を有する成形体を
形成し、そして得られた成形体の各々を１０００℃から
１２００℃の範囲内の温度で還元焼成して耐火物１から
８を調整した。EXAMPLES Formulations 1 to 5 (hereinafter referred to as "samples of the present invention") having a chemical composition within the scope of the present invention shown in Table 1 and formulations 6 to 6 having a chemical composition outside the scope of the present invention. 8 (hereinafter referred to as "comparative sample"), a powder and a phenolic resin in the range of 5 to 10% by weight were added, and the mixture was kneaded and kneaded to obtain a non-alumina or other non-alumina material. 30 mm x 30 mm x 2 for testing the amount of metal inclusions and corrosion resistance to molten steel
A molded article having a dimension of φ50 mm × 20 mm for measuring a molded article having a dimension of 30 mm and a permeability, and
Form compacts having dimensions of 100 mm outer diameter, 60 mm inner diameter and 250 mm length for testing spalling resistance, and reduce each of the resulting compacts at a temperature in the range of 1000 ° C to 1200 ° C. After firing, refractories 1 to 8 were prepared.
【００２８】[0028]
【表１】 [Table 1]
【００２９】上述した本発明のサンプル１から５及び比
較用サンプル６から８のそれぞれにおける物理特性値
（気孔率及び嵩比重）を表１に示す。Table 1 shows the physical property values (porosity and bulk specific gravity) of each of the above-mentioned samples 1 to 5 of the present invention and comparative samples 6 to 8.
【００３０】上述した外径１００ｍｍ，内径６０ｍｍ及
び長さ２５０ｍｍの寸法を有する本発明サンプル１から
５及び比較用サンプル６から８のそれぞれを電気炉にお
いて１５００℃の温度で３０分間加熱し、そして水によ
って急冷して耐スポーリンク性を調査した。その結果を
表１に示す。Each of Samples 1 to 5 of the present invention and Comparative Samples 6 to 8 having the above-mentioned dimensions of 100 mm in outer diameter, 60 mm in inner diameter and 250 mm in length were heated in an electric furnace at a temperature of 1500 ° C. for 30 minutes, and After rapid cooling, the sprinkling resistance was investigated. Table 1 shows the results.
【００３１】上述した３０ｍｍ×３０ｍｍ×２３０ｍｍ
の寸法を有する本発明のサンプル１から５及び比較用サ
ンプル６〜８、それぞれ０．０２から０．０５重量％の
範囲内のアルミニウムを含有する、１５５０℃の温度の
溶鋼中に１８０分間浸漬して溶損率（％）およびアルミ
ナ等の非金属介在物の付着量を調査した。その結果を表
１に示す。The above 30 mm × 30 mm × 230 mm
Samples 1 to 5 of the present invention and Comparative Samples 6 to 8 having the following dimensions were immersed in molten steel at a temperature of 1550 ° C. for 180 minutes containing aluminum in the range of 0.02 to 0.05% by weight, respectively. The erosion rate (%) and the adhesion amount of nonmetallic inclusions such as alumina were investigated. Table 1 shows the results.
【００３２】φ５０ｍｍ×２０ｍｍの寸法を有する本発
明のサンプル１から５及び比較用サンプル６〜８、それ
ぞれを電気炉において１５００℃の温度で６０分間加熱
し、冷却後通気率を測定した。その結果を表１に示す。Each of Samples 1 to 5 of the present invention having dimensions of φ50 mm × 20 mm and Comparative Samples 6 to 8 were heated in an electric furnace at a temperature of 1500 ° C. for 60 minutes, and after cooling, the air permeability was measured. Table 1 shows the results.
【００３３】表１からも明らかなように本発明のサンプ
ルは耐スポーリング性に優れており、溶損率の低いにも
かかわらずアルミナ等の非金属介在物が付着せず、従っ
て溶鋼連続鋳造用ノズルの内孔狭さく、さらには閉塞を
効果的に抑制できる。また、本発明サンプルは通気率が
小さいことから実使用時において耐火物を通しての空気
の巻き込みが抑制できる。As is clear from Table 1, the sample of the present invention has excellent spalling resistance and does not adhere to nonmetallic inclusions such as alumina despite its low erosion rate. The inner hole of the nozzle is narrowed and the blockage can be effectively suppressed. In addition, since the sample of the present invention has a low air permeability, it is possible to suppress the entrapment of air through the refractory during actual use.
【００３４】一方、比較用のサンプル６においてはロー
石の含有量が多いことに起因してアルミナ付着量は小さ
いが、耐スポーリング性は著しく劣り、また溶鋼に対す
る耐蝕性が著しく劣ることが明らかである。On the other hand, in Sample 6 for comparison, although the amount of adhered alumina was small due to the high content of the rock, the spalling resistance was remarkably poor, and the corrosion resistance to molten steel was remarkably poor. It is.
【００３５】また比較サンプル７においては炭化けい素
を添加していないためアルミナの付着が多く通気率も高
くなっている。また比較サンプル８においては炭化けい
素の添加量が多いため溶鋼に対する耐蝕性が著しく劣る
ことが明らかである。In Comparative Sample 7, since no silicon carbide was added, alumina adhered much and the air permeability was high. In Comparative Sample 8, it is apparent that the corrosion resistance to molten steel is extremely poor due to the large amount of silicon carbide added.
【００３６】[0036]
【発明の効果】従って、本発明の溶鋼連続鋳造用ノズル
によると耐火物の組織を劣化を生じることなくアルミナ
等の非金属介在物による内孔の狭さく、さらに閉塞を抑
制し、安定した操業を行なうことができる。Therefore, according to the nozzle for continuous casting of molten steel of the present invention, the inner hole is narrowed by non-metallic inclusions such as alumina without deteriorating the structure of the refractory, and furthermore, the clogging is suppressed and stable operation is achieved. Can do it.
【図１】溶鋼に接触する内孔表層部に本発明の組成材料
を設けた場合の縦断面図である。FIG. 1 is a longitudinal sectional view in a case where a composition material of the present invention is provided on a surface layer of an inner hole in contact with molten steel.
【図２】内孔表層部及び溶鋼連続鋳造用ノズル下部（溶
鋼浸漬部）に本発明の組成材料を設けた場合の縦断面図
である。FIG. 2 is a longitudinal sectional view in a case where the composition material of the present invention is provided in a surface layer portion of an inner hole and a lower portion (a molten steel immersion portion) of a molten steel continuous casting nozzle.
１ 内孔 ２ 内孔表層部 ３ 溶鋼連続鋳造用ノズル Reference Signs List 1 inner hole 2 inner hole surface layer 3 nozzle for continuous casting of molten steel
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成９年７月１４日[Submission date] July 14, 1997
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２８[Correction target item name] 0028
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００２８】[0028]
【表１】 [Table 1]
Claims (3)
する内孔表面部が鉱物としてパイロフィライトを主成分
とするロー石４５〜８５重量％、黒鉛１０〜３５重量
％、炭化けい素１〜１０重量％からなり、結合材を添加
混練成形し、非酸化雰囲気にて焼成したことを特徴とす
る溶鋼の連続鋳造用ノズル。In a continuous casting nozzle, the inner surface of the inner hole which comes into contact with molten steel has a mineral content of pyrophyllite as a main component, 45 to 85% by weight of rock, 10 to 35% by weight of graphite, 1 to 1% of silicon carbide. A nozzle for continuous casting of molten steel, comprising 10% by weight, kneaded and molded with a binder, and fired in a non-oxidizing atmosphere.
は８００℃以上で仮焼して結晶水を飛ばしアルカリ成分
１〜５重量％含むことを特徴とする請求項１記載の連続
鋳造用ノズル。2. The continuous casting nozzle as claimed in claim 1, wherein the pyrophyllite-based lozenge is calcined at 800 ° C. or more to remove crystallization water and contains 1 to 5% by weight of an alkali component. .
の粒度は平均粒径２５０μｍ以下がロー石配合重量比６
０％以下であることを特徴とする請求項１、２記載の連
続鋳造用ノズル。3. An average particle size of pyrophyllite-based rock is 250 μm or less.
3. The continuous casting nozzle according to claim 1, wherein the content is 0% or less.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34259896A JP3164342B2 (en) | 1996-12-05 | 1996-12-05 | Nozzle for continuous casting |
| AU39978/97A AU725529B2 (en) | 1996-10-16 | 1997-10-08 | A continuous casting nozzle for casting molten steel |
| DE69704645T DE69704645T2 (en) | 1996-10-16 | 1997-10-14 | Pouring nozzle for the continuous casting of steel |
| AT97117734T ATE200752T1 (en) | 1996-10-16 | 1997-10-14 | POURING NOZZLE FOR CONTINUOUS CASTING OF STEEL |
| EP97117734A EP0836901B1 (en) | 1996-10-16 | 1997-10-14 | A continuous casting nozzle for casting molten steel |
| CA002218428A CA2218428C (en) | 1996-10-16 | 1997-10-15 | A continuous casting nozzle for casting molten steel |
| US08/911,535 US5858261A (en) | 1996-10-16 | 1997-10-16 | Continuous casting nozzle for casting molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34259896A JP3164342B2 (en) | 1996-12-05 | 1996-12-05 | Nozzle for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10166117A true JPH10166117A (en) | 1998-06-23 |
| JP3164342B2 JP3164342B2 (en) | 2001-05-08 |
Family
ID=18355012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34259896A Expired - Fee Related JP3164342B2 (en) | 1996-10-16 | 1996-12-05 | Nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3164342B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000059657A1 (en) * | 1997-10-08 | 2000-10-12 | Akechi Ceramics Kabushiki Kaisha | Continuous casting nozzle |
| US6533146B1 (en) | 1997-10-08 | 2003-03-18 | Akechi Ceramics Kabushiki Kaisha | Continuous casting nozzle for molten steel |
-
1996
- 1996-12-05 JP JP34259896A patent/JP3164342B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000059657A1 (en) * | 1997-10-08 | 2000-10-12 | Akechi Ceramics Kabushiki Kaisha | Continuous casting nozzle |
| US6533146B1 (en) | 1997-10-08 | 2003-03-18 | Akechi Ceramics Kabushiki Kaisha | Continuous casting nozzle for molten steel |
| KR100367647B1 (en) * | 1999-04-05 | 2003-01-10 | 아케치세라믹스 가부시키가이샤 | A continuous casting nozzle for molten steel and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3164342B2 (en) | 2001-05-08 |
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