JPH10118749A - Nozzle for continuous casting - Google Patents
Nozzle for continuous castingInfo
- Publication number
- JPH10118749A JPH10118749A JP8295688A JP29568896A JPH10118749A JP H10118749 A JPH10118749 A JP H10118749A JP 8295688 A JP8295688 A JP 8295688A JP 29568896 A JP29568896 A JP 29568896A JP H10118749 A JPH10118749 A JP H10118749A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- continuous casting
- molten steel
- alumina
- inner hole
- 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
Landscapes
- 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】溶鋼の連続鋳造に於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。In the continuous casting of molten steel, the nozzle for continuous casting prevents the molten steel from being oxidized by contact with the air by injecting the molten steel between the tundish molds, and also prevents the molten steel from being scattered. It is used for the purpose of preventing oxidation due to contact, preventing scattering of molten steel, and rectifying pouring of molten metal to prevent inclusion of non-metallic inclusions and floating materials on the mold surface into a 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, non-metallic inclusions such as α-alumina adhered and deposited in this manner are peeled off or fall off and are rolled up in the slab, resulting in deterioration of 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供給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
の稼働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 supplying 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.) have low reactivity with aluminum oxide as a countermeasure in terms of material.
Nozzles have been proposed in which a non-oxide raw material is added to alumina-graphite or consists of itself. However, when it is added to alumina-graphite, if it is not added in a large amount, the effect of preventing adhesion is not recognized and the corrosion resistance is deteriorated, so that it is not practical. Also, when a nozzle is formed only from non-oxide-based materials, the effect can be expected, but it is not suitable for practical use due to the cost of the materials and production.
【0013】更に、CaOを含有する酸化物原料(Ca
O・ZrO2,CaO・SiO2,2CaO・SiO
2等)はCaOとAl2O3反応により低融点物質を生成
させ鋼中に溶出させる目的で、黒鉛−CaO含有酸化物
原料からなるノズルが提案されている。しかしながら、
鋳造時の溶鋼温度条件により、CaOとAl2O3反応性
は影響を受けやすく、また鋼中に多量のAl2O3介在物
が含まれる場合は、耐スポーリング性及び耐蝕性の面で
CaO量を十分に確保できない場合がある。Further, an oxide raw material containing CaO (Ca
O · ZrO 2 , CaO · SiO 2 , 2CaO · SiO
No. 2 ) has been proposed for the purpose of producing a low-melting substance by a reaction between CaO and Al 2 O 3 and dissolving it in steel, and a nozzle comprising a graphite-CaO-containing oxide raw material has been proposed. However,
The reactivity of CaO and Al 2 O 3 is easily affected by the temperature conditions of the molten steel during casting, and when a large amount of Al 2 O 3 inclusions is contained in the steel, the spalling and corrosion resistance are reduced. In some cases, a sufficient amount of CaO cannot be secured.
【0014】[0014]
【発明が解決しようとする課題】本発明の目的は、使用
中にノズル稼働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、稼働面組織を平滑化す
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す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 entrapped through a refractory structure, and smoothen the operating surface structure. It is economical and relatively economical without using a mechanical method such as blowing out an inert gas, and without promoting erosion to lower 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層部が鉱物組成としてパイロフィラ
イト(Al2O3・4SiO2・H2O)を主成分とするロ
ー石65〜90重量%,黒鉛10〜35重量%からな
り、有機バインダー等の結合剤を添加混練、成形し非酸
化性雰囲気で焼成したものであることを特徴とする。According to the present invention, at least the surface layer of the inner hole in contact with molten steel has a mineral composition of pyrophyllite (Al 2 O 3 .4SiO 2 .H 2 O) as a main component. It is characterized by being made up of 90% by weight and 10% to 35% by weight of graphite, added with a binder such as an organic binder, kneaded, molded and fired 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以下をロー石配合重量比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】本発明の鉱物組成において最も注目すべき
点は、ロー石の使用である。黒鉛及びカーボン共存化の
シリカは実使用時において SiO2(S)+C(S)=SiO(g)+CO(g) 3SiO(g)+2A1 =2Al2O3(S)+3Si 3CO(g)+2A1 =Al2O3(S)+3C 以上の反応によりシリカが消化分解しSiO(g)及び
CO(g)が生成し、鋼中A1と反応してAl2O3を生
成することにより、鋼中への酸素供給源となる。しかし
ロー石の場合、黒鉛及びカーボン共存化においても、ロ
ー石の粒の消化分解はなくロー石の主鉱物であるパイロ
フィライト(Al2O3・4SiO2・H2O)のSiO2
は安定であることが、ロー石+レジン粉末+炭素微粉か
らなるブリケットを作成しブリーズ内に埋め込み150
0℃×24hr熱処理後の顕微鏡観察で粒の崩壊、気泡
発生がないことから判明した。The most remarkable aspect of the mineral composition of the present invention is the use of olivine. In actual use, graphite and silica coexisting with carbon are SiO 2 (S) + C (S) = SiO (g) + CO (g) 3SiO (g) + 2A1 = 2Al 2 O 3 (S) + 3Si 3CO (g) + 2A1 = Al 2 O 3 (S) + 3C The silica is digested and decomposed by the above reaction to produce SiO (g) and CO (g), and reacts with A1 in the steel to form Al 2 O 3, and thereby into the steel. Oxygen source. However, in the case of loasite, even in the coexistence of graphite and carbon, there is no digestion and decomposition of the particles of the loasite and SiO 2 of pyrophyllite (Al 2 O 3 .4SiO 2 .H 2 O), which is the main mineral of the loasite.
Is stable, make briquette consisting of rubble stone + resin powder + carbon fine powder and embed in brieze 150
Microscopic observation after heat treatment at 0 ° C. for 24 hours revealed no collapse of particles and no generation of bubbles.
【0018】ロー石の半溶融温度は1500℃前後であ
り、溶鋼と接触する稼働面においては溶融しガラス皮膜
を成形することから、稼働面組織を平滑にし、またガラ
ス皮膜により耐火物組織を通しての空気の巻き込みを抑
制していることが1000℃×1hr熱処理後の通気率
95×10-4darcyに対し、1500℃で1hr熱
処理後では95×10-5darcyと小さく、通気率が
低下していることから分かる。The semi-melting temperature of the rock is about 1500 ° C., and the working surface in contact with the molten steel is melted to form a glass film, so that the working surface structure is smoothed and the glass film is used to pass through the refractory structure. The suppression of air entrainment is as small as 95 × 10 −5 darcy after heat treatment at 1500 ° C. for 1 hr, whereas the air permeability is 95 × 10 −4 darcy after heat treatment at 1000 ° C. × 1 hr. You can tell from that.
【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、稼働面にガラス皮膜を積極的
に生成させるためには65重量%以上が望ましく、また
90重量%以上では軟化変形が大きくなることから90
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 65% by weight or more in order to positively generate a glass film on the working surface, and if it is 90% by weight or more, softening deformation occurs. 90 because it grows
% By weight or less is desirable.
【0020】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.
【0021】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 higher to remove the crystal water is that the crystallization water of the rock is released from 500 to
At 800 ° C., the coefficient of thermal expansion becomes abnormally large and cracks occur in the refractory.
【0022】ロー石の粒度は平均粒径250μm以下を
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。If the average particle size of the rock is 250 μm or less and the weight ratio of the rock 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.
【0023】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
働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 rhoite can be used: pyrophyllite-type rock, kaolin-type rock, and sericite-type rock, but the working surface that comes into contact with molten steel during actual use becomes semi-molten and the glass layer 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.
【0024】(作用)パイロフィライト(Al2O3・4
SiO2・H2O)を主成分とするロー石65〜90重量
%,黒鉛10〜35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とはならな
い。またロー石の半溶融温度は1500℃前後であり、
溶鋼と接触する稼働面においてガラス皮膜層を形成し、
稼働面組織を平滑にし、かつ、耐火物組織を通しての空
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。(Action) Pyrophyllite (Al 2 O 3 .4)
The refractory composition consisting of 65 to 90% by weight of rocks and 10 to 35% by weight of graphite mainly composed of SiO 2 · H 2 O) has no digestion decomposition of the rocks even in the coexistence of graphite and carbon. It does not provide a source of oxygen into the steel, such as SiO 2 . The semi-solid temperature of the rock is around 1500 ° C,
Form a glass coating layer on the working surface that comes in contact with molten steel,
This has the effect of smoothing the working surface structure and suppressing air entrainment through the refractory structure, thereby suppressing the adhesion of Al 2 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, in 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, the nozzle 3 for the continuous casting of molten steel forming the inner hole 1. The inner-hole surface layer 2 is formed of a refractory having the above-described chemical composition. 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.
【0025】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.
【0026】[0026]
【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.
【0027】[0027]
【表1】 [Table 1]
【0028】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.
【0029】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グ性を調査した。その結果を
表1に示す。Each of the inventive samples 1 to 5 and the 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, spalling resistance was investigated. Table 1 shows the results.
【0030】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-mentioned 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.
【0031】φ50mm×20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 a size of φ50 mm × 20 and Comparative Samples 6 to 8 were heated in an electric furnace at a temperature of 1500 ° C. for 60 minutes,
After cooling, the air permeability was measured. Table 1 shows the results.
【0032】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.
【0033】一方、比較用のサンプル6に於いてはロー
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 Comparative Sample 6, although the amount of adhered alumina was small due to the high content of the rock, the spalling resistance was extremely poor and the corrosion resistance to molten steel was extremely poor. Is evident.
【0034】また、比較用サンプル7に於いては、ロー
石の替りにAl2O3とSiO2を含有しているためSi
O2が消化分解して鋼中に酸素を供給するためアルミナ
の付着量が著しく多く、また、比較用サンプル8に於い
ては、ロー石の替りにSiO2を含まず、Al2O3のみの
含有であり、鋼中に酸素を供給する鉱物を除去したにも
かかわらず、通気率が高く、アルミナ等の非金属介在物
の付着が多い。The sample 7 for comparison contains Al 2 O 3 and SiO 2 in place of the rock, so that Si
O 2 oxygen remarkable amount of adhesion of alumina to supply much during digestion decomposed to steel, also, is at the comparative sample 8, instead of the roseki not contain SiO 2, only Al 2 O 3 Although the mineral that supplies oxygen to steel is removed, the permeability is high and non-metallic inclusions such as alumina adhere much.
【0035】[0035]
【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】0027[Correction target item name] 0027
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【0027】[0027]
【表1】 [Table 1]
Claims (3)
する内孔表層部が鉱物組成としてパイロフィライト(A
l2O3・4SiO2・H2O)を主成分とするロー石65
〜90重量%,黒鉛10〜35重量%からなり、結合剤
を添加混練、成形し、非酸化性雰囲気で焼成したことを
特徴とする溶鋼の連続鋳造用ノズル。In a continuous casting nozzle, a surface portion of an inner hole in contact with molten steel has a mineral composition of pyrophyllite (A).
(1) 2 O 3 · 4 SiO 2 · H 2 O)
A nozzle for continuous casting of molten steel, which comprises 90 to 90% by weight and 10 to 35% by weight of graphite, with a binder added, kneaded, molded 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. .
は粒度が平均粒径250μm以下をロー石配合重量比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. The limestone containing pyrophyllite as a main component has an average particle diameter of 250 μm or less, and the ration weight of the limestone is 6%.
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 |
---|---|---|---|
JP8295688A JP2940668B2 (en) | 1996-10-16 | 1996-10-16 | Nozzle for continuous casting |
AU39978/97A AU725529B2 (en) | 1996-10-16 | 1997-10-08 | A continuous casting nozzle for casting molten steel |
EP97117734A EP0836901B1 (en) | 1996-10-16 | 1997-10-14 | 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 |
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 |
---|---|---|---|
JP8295688A JP2940668B2 (en) | 1996-10-16 | 1996-10-16 | Nozzle for continuous casting |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10118749A true JPH10118749A (en) | 1998-05-12 |
JP2940668B2 JP2940668B2 (en) | 1999-08-25 |
Family
ID=17823899
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8295688A Expired - Lifetime JP2940668B2 (en) | 1996-10-16 | 1996-10-16 | Nozzle for continuous casting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2940668B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000061321A1 (en) * | 1999-04-09 | 2000-10-19 | Akechi Ceramics Kabushiki Kaisha | Continuous casting nozzle |
-
1996
- 1996-10-16 JP JP8295688A patent/JP2940668B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000061321A1 (en) * | 1999-04-09 | 2000-10-19 | Akechi Ceramics Kabushiki Kaisha | Continuous casting nozzle |
US6257466B1 (en) | 1999-04-09 | 2001-07-10 | Akechi Ceramics Kabushiki Kaisha | Continuous casting nozzle |
Also Published As
Publication number | Publication date |
---|---|
JP2940668B2 (en) | 1999-08-25 |
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