JPH0732103A - Nozzle for casting molten metal - Google Patents

Nozzle for casting molten metal

Info

Publication number
JPH0732103A
JPH0732103A JP5178030A JP17803093A JPH0732103A JP H0732103 A JPH0732103 A JP H0732103A JP 5178030 A JP5178030 A JP 5178030A JP 17803093 A JP17803093 A JP 17803093A JP H0732103 A JPH0732103 A JP H0732103A
Authority
JP
Japan
Prior art keywords
nozzle
cao
inclusions
molten metal
porosity
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Withdrawn
Application number
JP5178030A
Other languages
Japanese (ja)
Inventor
Yoko Nagata
陽子 永田
Yasuhiro Kawashima
康弘 川島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP5178030A priority Critical patent/JPH0732103A/en
Publication of JPH0732103A publication Critical patent/JPH0732103A/en
Withdrawn legal-status Critical Current

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Landscapes

  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

PURPOSE:To decrease the sticking of inclusions to a nozzle for casting to be used for pouring molten metal and to prevent clogging of this nozzle by specifying the compsn. and apparent porosity of the nozzle. CONSTITUTION:This built-in type or integral type nozzle for casting is used at the time of pouring molten metal of >=5ppm 0 total oxygen content T. The compsn. thereof is composed of 73 to 100wt.% CaO and the balance 0 to 27wt.% in total of >=1 kinds among carbon, Si carbide, titanium oxide and nitride of Al and B. The apparent porosily is <=5%. Molten steel is poured into the nozzle formed by adding, for example, additive components C and SiC to CaO of 99.5% purity. The porosity is 3%. The results thereof are such that the sticking of the inclusions to the CaO-rich nozzle is not admitted and that defects, such as crack and craze, are not generated. As a result, the sticking of the Al2O3 inclusions to the inside surface of the nozzle at the time of continuously casting particularly the molten metal subjected to Al deoxidation is effectively prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えば連続鋳造におけ
る浸漬ノズルのような、溶融金属、特にAlで脱酸した溶
融金属の内装型又は一体型鋳造用ノズルに関する。
FIELD OF THE INVENTION The present invention relates to a nozzle for internal or integral casting of molten metal, in particular molten metal deoxidized with Al, such as immersion nozzles in continuous casting.

【0002】[0002]

【従来の技術】近年、連続鋳造における浸漬ノズルの閉
塞が問題となっている。そのような浸漬ノズルの閉塞は
主に溶鋼中のAl2O3 介在物がノズル内面に付着すること
から引き起こされ、溶鋼中にTiが添加された場合は特に
ノズルへの介在物付着が促進される。
2. Description of the Related Art In recent years, the blockage of an immersion nozzle in continuous casting has become a problem. Such blockage of the immersion nozzle is mainly caused by Al 2 O 3 inclusions in the molten steel adhering to the inner surface of the nozzle, especially when Ti is added to the molten steel, the adhesion of inclusions to the nozzle is promoted. It

【0003】ノズル閉塞が起きると付着介在物が原因で
製品の疵となったり鋳造作業の持続を阻害する。このよ
うにして起こるノズル閉塞の防止または低減の目的で従
来よりさまざまな方策がなされている (例えば特開昭55
−114449号公報、特開平3−138054号公報) 。
When the nozzle is clogged, adhered inclusions cause defects in the product and hinder the continuation of the casting operation. Various measures have heretofore been taken for the purpose of preventing or reducing the nozzle clogging that occurs in this way (see, for example, Japanese Patent Laid-Open No. 55-55).
-114449 and Japanese Patent Laid-Open No. 138054/1993).

【0004】例えば、不活性ガスを浸漬ノズル内に吹き
込むことにより、溶鋼とノズルの接触面積を低下させま
たノズル内面に付着したAl2O3 介在物を剥離させてノズ
ル閉塞を防止する方策がとられている。しかし、不活性
ガスの吹き込みは鋼中のピンホールの原因となる可能性
があり製品欠陥の原因となるため完全な対策とはいえな
い。
For example, by blowing an inert gas into the immersion nozzle, the contact area between the molten steel and the nozzle can be reduced, and the Al 2 O 3 inclusions adhering to the inner surface of the nozzle can be peeled off to prevent nozzle clogging. Has been. However, the blowing of the inert gas may cause pinholes in the steel and cause product defects, so it cannot be said to be a complete countermeasure.

【0005】一方、材質面からのノズル閉塞の防止策と
しては、CaO 含有量が30%以下であるZrO2−CaO 系耐火
物のようなCaO 系耐火物をノズル材質に用いるという提
案もある。これはAl2O3 がCaO と反応して低融点物を形
成することから溶鋼中のAl2O3 がノズル内面に付着した
際、ノズル中のCaO と反応して低融点物を形成し、ノズ
ル内部に吸収されるかまたは溶鋼に洗い流されていくこ
とを利用してノズル閉塞を防止するものである。
On the other hand, as a measure for preventing nozzle clogging from the aspect of material, there is also a proposal to use a CaO-based refractory such as a ZrO 2 —CaO-based refractory having a CaO content of 30% or less as a nozzle material. This is because Al 2 O 3 reacts with CaO to form a low-melting point product, so when Al 2 O 3 in molten steel adheres to the inner surface of the nozzle, it reacts with CaO in the nozzle to form a low-melting point product. The nozzle is blocked by being absorbed into the nozzle or washed away by the molten steel.

【0006】しかし、このCaO 系耐火物をノズル材質に
用いることによりノズル閉塞を防止するという方法はノ
ズル中のCaO 濃度が30wt%以下であるため、今日一般的
にみられるAl脱酸した溶鋼中のように0.001 %以上とAl
2O3 量が高い場合、ノズル閉塞防止の効果が期待できる
とは限らない。これはAl2O3 とCaO が反応して当初は低
融点物を形成しても、ノズル中のCaO 濃度が減少してく
るとAl2O3 とCaO の反応生成物の融点は高くなり、最終
的にはノズル壁に付着するからである。これらの問題を
解決するにはCaO 濃度を高めれば良いが、CaO が高濃度
の耐火物は、スポーリング (熱衝撃による割れ) を起こ
しやすく、スポーリングを起こすと耐火物の隙間に溶鋼
が流れ込む危険があり、耐火物の破片が溶鋼中に混入し
溶鋼汚染が問題となる。従って、連続鋳造に用いる浸漬
ノズルの閉塞の問題は根本的な解決に至ってはいないの
が現状である。
However, the method of preventing nozzle clogging by using this CaO-based refractory as the nozzle material has a CaO concentration of 30 wt% or less in the nozzle. Like 0.001% and above with Al
When the amount of 2 O 3 is high, the effect of preventing nozzle clogging may not always be expected. This is because even if Al 2 O 3 and CaO react to form a low melting point product at first, the melting point of the reaction product of Al 2 O 3 and CaO increases as the CaO concentration in the nozzle decreases. This is because they eventually adhere to the nozzle wall. To solve these problems, it is sufficient to increase the CaO concentration, but refractory with a high concentration of CaO easily causes spalling (cracking due to thermal shock), and when spalling causes molten steel to flow into the gap of the refractory. It is dangerous and the fragments of refractory material are mixed in the molten steel, and the contamination of molten steel becomes a problem. Therefore, the problem of blockage of the immersion nozzle used for continuous casting has not been fundamentally solved.

【0007】[0007]

【発明が解決しようとする課題】本発明は、特にAl脱酸
した溶融金属を注湯する場合に、注湯ノズルの閉塞を防
止又は低減することのできる鋳造用ノズルを提供するこ
とを目的とする。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a casting nozzle capable of preventing or reducing the clogging of the pouring nozzle, especially when pouring molten metal deoxidized with Al. To do.

【0008】[0008]

【課題を解決するための手段】本発明者らは、Al2O3
CaO とが反応して低融点物を生成するという点に着目し
て、種々検討を重ねた結果、CaO の含有量と気孔率と組
成とを適切に調整し、高含有量かつ緻密質とすることに
より、CaO の吸湿性の問題を解消し、さらに耐熱衝撃性
および耐スポーリング性が大幅に改善されることを知
り、本発明を完成した。
[Means for Solving the Problems] The present inventors have found that Al 2 O 3
Focusing on the fact that it reacts with CaO to form a low-melting point product, as a result of various studies, the CaO content, porosity, and composition were properly adjusted to obtain a high content and denseness. As a result, the inventors have found that the problem of CaO 2 hygroscopicity is solved, and that the thermal shock resistance and spalling resistance are greatly improved, and the present invention has been completed.

【0009】すなわち、Al2O3 とCaO が反応して低融点
物を生成するという知見は従来より広く知られているこ
とであるが、CaO は水分を吸収しやすいため取扱が難し
く、また耐熱衝撃性が低いため実操業のレベルでは使用
が困難であった。しかし、気孔率が5%以下であって、
炭素、SiC などの炭化物、チタン酸化物、BN、AlN など
の窒化物の1種以上を0〜27%、CaO 73〜100 wt%から
なる組成を有するノズルを用いることにより、溶鋼中の
Al2O3 系介在物が多量に付着しても、ノズル中のCaO 濃
度が高いためにノズルと介在物との反応生成物の融点は
高くなることはなく、よってノズルに介在物の付着も起
こらずノズル閉塞も起こらないことを見い出し、本発明
を完成させた。
That is, it has been widely known that Al 2 O 3 and CaO react with each other to form a low melting point substance. However, since CaO easily absorbs moisture, it is difficult to handle and heat resistance is high. Due to its low impact resistance, it was difficult to use at the level of actual operation. However, if the porosity is 5% or less,
By using a nozzle having a composition of 0 to 27% of Ca, carbide such as SiC, titanium oxide, nitride such as BN and AlN, and 73 to 100 wt% of CaO,
Even if a large amount of Al 2 O 3 -based inclusions adhere, the melting point of the reaction product between the nozzle and the inclusions does not rise because the CaO concentration in the nozzle is high, and therefore the inclusions also adhere to the nozzle. The present invention has been completed by discovering that neither nozzle clogging nor nozzle clogging occurs.

【0010】ここに、本発明の要旨とするところは、全
酸素含有量 T.O≧5ppm の溶融金属を注湯する時に使用
する内装型又は一体型鋳造用ノズルであって、その組成
が、CaO 73〜100wt %、残部が炭素、Si炭化物、チタン
酸化物、AlおよびBの窒化物の1種以上合計で0〜27wt
%から成り、見かけ気孔率が5%以下であることを特徴
とする内装型又は一体型鋳造用ノズルである。
The gist of the present invention is an internal or integral casting nozzle used when pouring molten metal having a total oxygen content TO ≧ 5 ppm, the composition of which is CaO 73 〜100wt%, the balance is one or more of carbon, Si carbide, titanium oxide, and Al and B nitrides.
%, And the apparent porosity is 5% or less.

【0011】なお、「内装型」とは、母材ノズル内のノ
ズル通胴部、吐出孔部の全て、もしくはその一部に本発
明のCaO 含有組成ノズルを嵌め込んだものであり、「一
体型」とはスラグライン部に別材質をセットし他は本発
明のCaO 含有組成ノズルである。
The "interior type" is one in which the CaO-containing composition nozzle of the present invention is fitted into all or part of the nozzle body portion and discharge hole portion in the base material nozzle. The "body type" is the CaO 2 -containing composition nozzle of the present invention in which another material is set in the slag line portion.

【0012】本発明によれば、特にAl脱酸した溶融金属
(例: 溶鋼、Ni基合金、Co基合金)を連続的に鋳込む際
のノズル内表面へのAl2O3 系介在物の付着を効果的に阻
止できる。
According to the invention, in particular Al deoxidized molten metal
(Example: molten steel, Ni-based alloy, Co-based alloy) can be effectively prevented from adhering Al 2 O 3 -based inclusions to the inner surface of the nozzle when continuously casting.

【0013】[0013]

【作用】以下、本発明の構成をその作用とともに説明す
る。本発明にかかる溶融金属注湯用ノズルは、耐熱吸湿
性に優れ、耐衝撃性を備えたノズル閉塞を防止できるノ
ズルである。
The operation of the present invention will be described below together with its operation. The molten metal pouring nozzle according to the present invention is a nozzle having excellent heat resistance and hygroscopicity and having impact resistance and capable of preventing nozzle clogging.

【0014】本発明にかかる溶融金属注湯用ノズルは、
耐衝撃性の向上のためにC、SiC のような炭化物、さら
にはTi酸化物や、AlN 、BNのような窒化物を1種以上合
計で0 〜27%含有し、残部にCaO を73〜100 wt%含有
し、気孔率5%以下の緻密なCaO(カルシア) 系ノズルで
ある。
The molten metal pouring nozzle according to the present invention comprises:
In order to improve impact resistance, one or more kinds of carbides such as C and SiC, as well as Ti oxide and nitrides such as AlN and BN are contained in a total amount of 0 to 27%, and the balance of CaO is 73 to 70%. It is a dense CaO (calcia) -based nozzle containing 100 wt% and having a porosity of 5% or less.

【0015】本発明において重要な点は、高純度、高濃
度の緻密質( 見かけ気孔率5%以下) のCaO を73wt%以
上用いる点である。従来より、ノズル閉塞の防止手段と
してノズルに付着する溶鋼中Al2O3 とノズル中のCaO を
反応させることにより低融点物を生成させてノズルへの
介在物付着を防止するという方策がとられているが、既
存の材質では特にAl脱酸したときのように溶鋼中のAl2O
3 量が多い場合、ノズル閉塞防止の効果が期待できると
は限らない。
An important point in the present invention is that 73% by weight or more of CaO having a high purity and a high density of compact (apparent porosity of 5% or less) is used. Conventionally, as a means for preventing nozzle clogging, a measure has been taken to prevent Al 2 O 3 in molten steel adhering to the nozzle from reacting with CaO in the nozzle to generate a low melting point substance and prevent inclusions from adhering to the nozzle. However, in the case of existing materials, Al 2 O in molten steel, especially when deoxidizing Al, is used.
If 3 amount is large, not necessarily with the effect of preventing nozzle clogging it can be expected.

【0016】これは従来のノズルが気孔率が大であるた
めに溶鋼中のAl2O3 とノズル中のCaO とが反応して生成
した低融点のカルシウムアルミネートがノズル内の細孔
を通って内部へと浸透する吸収型の構造であることが原
因となっている。つまり、Al2O3 とCaO が反応して当初
は低融点物を形成しても、ノズル中のCaO 濃度が減少す
るとAl2O3 とCaO が反応して当初は低融点物を形成して
も、ノズル中のCaO 濃度が減少するとAl2O3 とCaO との
反応生成物の融点は高くなり、最終的にはノズル壁に付
着するからである。
This is because the conventional nozzle has a large porosity, so that the low melting point calcium aluminate formed by the reaction of Al 2 O 3 in the molten steel and CaO in the nozzle passes through the pores in the nozzle. The cause is that it is an absorption type structure that penetrates into the interior. In other words, even if Al 2 O 3 and CaO react to form a low-melting substance at first, when the CaO concentration in the nozzle decreases, Al 2 O 3 reacts with CaO to form a low-melting substance at first. This is also because the melting point of the reaction product of Al 2 O 3 and CaO increases as the CaO concentration in the nozzle decreases, and eventually the reaction product adheres to the nozzle wall.

【0017】この点、本発明にかかるCaO ノズルは気孔
率が極めて低く、緻密であり、従来型とは異なる溶損型
のノズルである。このCaO ノズルはノズル中のCaO 濃度
が高いために溶鋼中のAl2O3 系介在物が多量に付着して
もノズルと介在物との反応生成物の融点は高くなること
はなく、よって、ノズルに介在物の付着も起こらず、そ
の結果ノズル閉塞を防止し、しかも緻密であることか
ら、吸湿性の問題も解決される。
In this respect, the CaO nozzle according to the present invention has a very low porosity, is dense, and is a meltdown type nozzle different from the conventional type. Since this CaO nozzle has a high CaO concentration in the nozzle, even if a large amount of Al 2 O 3 -based inclusions in the molten steel adhere, the melting point of the reaction product between the nozzle and inclusions does not increase, so that No inclusions adhere to the nozzles, and as a result, the nozzles are prevented from being clogged, and since they are dense, the problem of hygroscopicity is solved.

【0018】またこのCaO ノズルは、単独の一体型ノズ
ルとして使用しても、従来のノズルに嵌め込む内装型ノ
ズルとして使用しても十分効果がある。次に、本発明に
おいてノズル材質を上述のように限定した理由について
さらに詳述する。
Further, this CaO nozzle is sufficiently effective whether it is used as a single integrated nozzle or as an internal nozzle fitted into a conventional nozzle. Next, the reason why the nozzle material is limited as described above in the present invention will be described in more detail.

【0019】これまでカルシア(CaO) は耐熱衝撃性、耐
スポーリング性が高くないことから、優れた特性を種々
持ちながら利用範囲が限定されていた。しかしながら、
本発明においては、C、SiC 、TiO2、AlN 、BNのような
耐熱衝撃性の優れた炭素、炭化物、酸化物、窒化物をカ
ルシアに添加することにより、カルシア製ノズルの耐ス
ポーリング性を向上させることができる。また、カルシ
アに添加する物質が炭化物でない場合には、ノズル内に
溶融金属が通過してもノズルからのカーボンピックアッ
プは防止される。
Until now, since calcia (CaO) is not high in thermal shock resistance and spalling resistance, its range of use has been limited while having various excellent properties. However,
In the present invention, by adding carbon, carbide, oxide, or nitride having excellent thermal shock resistance such as C, SiC, TiO 2 , AlN, and BN to calcia, the spalling resistance of the calcia nozzle is improved. Can be improved. Further, when the substance added to calcia is not a carbide, carbon pickup from the nozzle is prevented even if the molten metal passes through the nozzle.

【0020】かかる効果を発揮させるためには、C、Si
C 、TiO2、AlN 、BNのうちの少なくとも1種を合計量で
27wt%以下配合する。これを越えて配合すると鋳込量の
増加に伴いノズルが溶損してしまう。下限は特に制限な
い。
In order to exert such effects, C, Si
The total amount of at least one of C, TiO 2 , AlN and BN
Add less than 27wt%. If the content exceeds this range, the nozzle will melt due to an increase in the casting amount. There is no particular lower limit.

【0021】さらに、従来、CaO には吸湿性の問題があ
るとされてきたが、本発明によれば、CaO 高純度、高濃
度73wt%以上、ノズル材としての気孔率を5%以下に制
限することで、高純度、緻密質となり、従来の吸湿性の
問題は解消できる。なお、CaO に含まれる不純物として
は、SiO2、Al2O3 、等が挙げられる。
Further, although it has been conventionally said that CaO has a problem of hygroscopicity, according to the present invention, CaO has a high purity, a high concentration of 73 wt% or more, and a porosity as a nozzle material is limited to 5% or less. By doing so, it becomes highly pure and dense, and the conventional problem of hygroscopicity can be solved. Note that examples of impurities contained in CaO include SiO 2 and Al 2 O 3 .

【0022】本発明のCaO 系ノズルは高純度、高濃度で
あり、従来の吸収型とは異なる溶損型のノズルである。
このCaO 系ノズルはノズル中のCaO 濃度が高いために溶
鋼中のAl2O3 系介在物が多量に付着してもノズルと介在
物との反応生成物の融点は高くなることはなく、よって
ノズルに介在物の付着も起こらない。その結果、ノズル
閉塞を防止し、しかも成分調整が施され、適度の気孔率
をもつためスポーリング性の問題も解決され、ノズルに
耐水性樹脂をコーティングすれば耐吸湿性が向上し、作
業性の問題も解決される。
The CaO 2 nozzle of the present invention has a high purity and a high concentration, and is a melt-damage type nozzle different from the conventional absorption type.
Since this CaO-based nozzle has a high CaO concentration in the nozzle, even if a large amount of Al 2 O 3 -based inclusions in the molten steel adhere, the melting point of the reaction product between the nozzle and inclusions does not increase, so No inclusions are attached to the nozzle. As a result, nozzle clogging is prevented, the composition is adjusted, and the problem of spalling is solved because it has an appropriate porosity. If a nozzle is coated with a water-resistant resin, moisture absorption resistance is improved and workability is improved. The problem of is solved.

【0023】このノズルは、単独で、つまり一体型とし
て使用しても、従来のノズルにはめ込む内装型ノズルと
して使用しても十分効果がある。本発明が適用される溶
融金属としては例えば、Ni基合金、Co基合金、ステンレ
スが挙げられ、T.O.は5ppm 以上であるが、それはT.O.
<5ppm ではAl2O3 が少なく介在物の付着がみられない
からである。
This nozzle is sufficiently effective whether it is used alone, that is, as an integrated type or as an internal type nozzle that is fitted into a conventional nozzle. Examples of the molten metal to which the present invention is applied include Ni-based alloys, Co-based alloys, and stainless steel, and TO is 5 ppm or more.
This is because if it is <5 ppm, the amount of Al 2 O 3 is small and inclusions are not seen.

【0024】図1に純度99.5%のCaO に添加成分C、Si
C をそれぞれ添加した組成のノズルに表1の組成の溶鋼
([Ti])=0wt %、sol.[Al]=0.06wt%を注湯したときの
結果を示す。なお、気孔率は3%であった。また、本例
で用いたCaO は純度が99.5%ということで、JIS (R2205
の測定方法による) によって測定した吸水率はゼロであ
った。
FIG. 1 shows that CaO having a purity of 99.5% and added components C and Si.
Molten steel with the composition shown in Table 1 in the nozzle with the composition of C added
The results when ([Ti]) = 0 wt% and sol. [Al] = 0.06 wt% are poured are shown. The porosity was 3%. The purity of CaO used in this example is 99.5%, which means that
The water absorption rate was zero.

【0025】比較例として表3に示す組成をもったアル
ミナグラファイト製ノズルを用いて同様の注湯試験を行
い、その結果を同じく図1に示す。図1の結果から分か
るように、本発明で規定する範囲のCaO 濃度のノズルに
は介在物の付着は見られなかったが、本発明のCaO 濃度
域より低いCaO 濃度では若干の介在物付着がみられた。
また、実験後、割れやひび等の欠陥は見られなかった。
これらの結果からノズル閉塞を防止するために必要なノ
ズル中のCaO 濃度は73wt%以上と考えられる。
As a comparative example, the same pouring test was carried out using an alumina graphite nozzle having the composition shown in Table 3, and the results are also shown in FIG. As can be seen from the results shown in FIG. 1, the inclusion of inclusions was not observed in the nozzle having the CaO concentration within the range defined by the present invention, but some inclusions were found at CaO concentrations lower than the CaO concentration range of the present invention. It was seen.
After the experiment, no defects such as cracks and cracks were found.
From these results, it is considered that the CaO concentration in the nozzle required to prevent nozzle clogging is 73 wt% or more.

【0026】図2に純度99.5%のCaO に添加成分TiO2
AlN を添加した組成のノズルに表2の組成成分の溶鋼
([Ti])=0wt %、sol.[Al]=0.06wt%を注湯したときの
結果を示す。本例の場合も、気孔率は5%、またCaO は
純度が99.5%ということで、JIS (R2205の測定方法によ
る) によって測定した吸水率はゼロであった。
FIG. 2 shows that CaO having a purity of 99.5% and an additive component TiO 2 ,
Molten steel with the composition components shown in Table 2 in the nozzle with the composition added with AlN
The results when ([Ti]) = 0 wt% and sol. [Al] = 0.06 wt% are poured are shown. Also in this example, since the porosity was 5% and the purity of CaO was 99.5%, the water absorption rate measured by JIS (by the measuring method of R2205) was zero.

【0027】比較例として表3に示す組成をもったアル
ミナグラファイト製ノズルを用いて同様の注湯試験を行
い、その結果を同じく図2に示す。図2の結果から分か
るように、CaO 73wt%以上と本発明で規定する範囲のCa
O濃度のノズルには介在物の付着は見られなかったが、
本発明のCaO 濃度域より低いCaO 濃度では若干の介在物
付着がみられた。また、実験後、割れやひび等の欠陥は
見られなかった。
As a comparative example, the same pouring test was carried out using an alumina graphite nozzle having the composition shown in Table 3, and the results are also shown in FIG. As can be seen from the results in FIG. 2, CaO of 73 wt% or more and Ca within the range specified in the present invention.
No inclusions were found on the O concentration nozzle,
At CaO concentrations lower than the CaO concentration range of the present invention, some inclusions were observed. After the experiment, no defects such as cracks and cracks were found.

【0028】なお、表1および表2の場合、溶鋼中のT.
O.≧5ppm であった。次に、図3に本発明のノズルと本
発明のノズルより気孔率の高いノズルを用いて表1と同
一成分の溶鋼([Ti])=0wt %、sol.[Al]=0.06 wt %を
200kg 注湯したときのノズルの溶損量を示す。CaO の純
度は99.5%、他の添加物はTiO2、Cであった。
In the case of Table 1 and Table 2, T.
O. ≧ 5 ppm. Next, in FIG. 3, molten steel ([Ti]) = 0 wt% and sol. [Al] = 0.06 wt% having the same composition as in Table 1 were prepared using the nozzle of the present invention and a nozzle having a higher porosity than the nozzle of the present invention.
Shows the amount of melt damage of the nozzle when pouring 200 kg of molten metal. The purity of CaO was 99.5%, and the other additives were TiO 2 and C.

【0029】図3の結果より、ノズルの気孔率が5%を
越えるとノズルの溶損量が大きく増加し、実際の鋳造に
使用するには気孔率5%以下にする必要がある。
From the results shown in FIG. 3, when the porosity of the nozzle exceeds 5%, the amount of melt loss of the nozzle greatly increases, and it is necessary to reduce the porosity to 5% or less for actual casting.

【0030】[0030]

【実施例】次に、実施例により本発明を具体的に説明す
る。表1に示した組成の溶鋼にTi、Alを添加し、ノズル
閉塞を起こしやすいとされているTi入り極低炭素鋼 (S
ol [Al] =0.06wt%) を用意して、注湯実験を行った。
注湯温度は1600℃、溶鋼量は200 kgであった。
EXAMPLES Next, the present invention will be described in detail with reference to examples. Ti-containing ultra-low carbon steel (S that is likely to cause nozzle clogging by adding Ti and Al to molten steel having the composition shown in Table 1 (S
ol [Al] = 0.06 wt%) was prepared and a pouring experiment was conducted.
The pouring temperature was 1600 ° C, and the molten steel amount was 200 kg.

【0031】本発明にかかるノズルは、純度99.5%のCa
O を用い、表4に示す組成割合のノズル材を用いて構成
し、比較例として前述の表3に示す組成のアルミナグラ
ファイトノズルを用いた。
The nozzle according to the present invention has a purity of 99.5% Ca.
A nozzle material having a composition ratio shown in Table 4 was used using O 2, and an alumina graphite nozzle having a composition shown in Table 3 was used as a comparative example.

【0032】得られた各ノズルについて気孔率をもと
に、ノズル閉塞試験、熱衝撃試験、そして耐スポーリン
グ試験を行った。結果は表4に示す。このときの本発明
のノズルへの介在物付着状況ならびにアルミナグラファ
イトノズルへの介在物付着状況を図3、4に示す。
A nozzle blockage test, a thermal shock test, and a spalling resistance test were performed on each of the obtained nozzles based on the porosity. The results are shown in Table 4. The state of inclusions adhering to the nozzle of the present invention and the state of inclusions adhering to the alumina graphite nozzle at this time are shown in FIGS.

【0033】図3、4より従来使用しているアルミナグ
ラファイトノズルを用いた場合と比較して、本発明のノ
ズルを用いた場合、ノズルへの介在物付着は起こらずノ
ズル閉塞も起こらない。
As shown in FIGS. 3 and 4, compared with the case where the conventionally used alumina graphite nozzle is used, when the nozzle of the present invention is used, inclusions do not adhere to the nozzle and nozzle clogging does not occur.

【0034】[0034]

【表1】 [Table 1]

【0035】[0035]

【表3】 [Table 3]

【0036】[0036]

【表4】 [Table 4]

【0037】[0037]

【発明の効果】溶融金属の注湯に際し、本発明のノズル
を用いることによりノズルへの介在物付着が大きく低減
されノズル閉塞防止に有効である。
When pouring molten metal, the use of the nozzle of the present invention greatly reduces the adhesion of inclusions to the nozzle and is effective in preventing nozzle clogging.

【図面の簡単な説明】[Brief description of drawings]

【図1】ノズル組成中の添加成分濃度とノズル内表面へ
の介在物付着量との関係を示すグラフである。
FIG. 1 is a graph showing the relationship between the additive component concentration in the nozzle composition and the amount of inclusions attached to the inner surface of the nozzle.

【図2】ノズル組成中の添加成分濃度とノズル内表面へ
の介在物付着量との関係を示すグラフである。
FIG. 2 is a graph showing the relationship between the concentration of additive components in the nozzle composition and the amount of inclusions adhering to the inner surface of the nozzle.

【図3】ノズルの気孔率とノズル溶損量との関係を示す
グラフである。
FIG. 3 is a graph showing the relationship between the porosity of a nozzle and the amount of nozzle melt loss.

【図4】ノズル閉塞を起こし易いとされているTi入り極
低炭素鋼を鋳造した場合、本発明にかかるノズルを用い
たときのノズルへの介在物付着量と鋼中のTi濃度との関
係を示すグラフである。
FIG. 4 shows the relationship between the amount of inclusions deposited on the nozzle and the Ti concentration in the steel when the nozzle according to the present invention is used when casting Ti-containing ultra-low carbon steel that is apt to cause nozzle clogging. It is a graph which shows.

【図5】従来使用されているアルミナグラファイトノズ
ルを用いてTi入り極低炭素鋼を鋳造した場合のノズルへ
の介在物付着量と鋼中のTi濃度との関係を示すグラフで
ある。
FIG. 5 is a graph showing the relationship between the amount of inclusions deposited on the nozzle and the Ti concentration in the steel when Ti-containing ultra-low carbon steel is cast using a conventionally used alumina graphite nozzle.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 全酸素含有量 T.O≧5ppm の溶融金属を
注湯する時に使用する内装型又は一体型鋳造用ノズルで
あって、その組成がCaO 73wt%以上から構成され、見か
け気孔率が5%以下であることを特徴とする内装型又は
一体型鋳造用ノズル。
1. An internal or integral casting nozzle used when pouring molten metal having a total oxygen content TO ≧ 5 ppm, the composition of which is 73% by weight or more of CaO and the apparent porosity of which is 5%. % Or less, an interior or integral casting nozzle.
【請求項2】 全酸素含有量 T.O≧5ppm の溶融金属を
注湯する時に使用する内装型又は一体型鋳造用ノズルで
あって、その組成がCaO 73wt%以上、残部が炭素、炭化
物、チタン酸化物および窒化物から成る群から選んだ少
なくとも1種合計27wt%以下から成り、見かけ気孔率が
5%以下であることを特徴とする内装型又は一体型鋳造
用ノズル。
2. An internal or integral casting nozzle used when pouring molten metal having a total oxygen content of TO ≧ 5 ppm, the composition of which is 73% by weight or more of CaO and the balance is carbon, carbide or titanium oxide. A nozzle for internal or integral casting, comprising at least one selected from the group consisting of oxides and nitrides and having a total content of 27 wt% or less and an apparent porosity of 5% or less.
JP5178030A 1993-07-19 1993-07-19 Nozzle for casting molten metal Withdrawn JPH0732103A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5178030A JPH0732103A (en) 1993-07-19 1993-07-19 Nozzle for casting molten metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5178030A JPH0732103A (en) 1993-07-19 1993-07-19 Nozzle for casting molten metal

Publications (1)

Publication Number Publication Date
JPH0732103A true JPH0732103A (en) 1995-02-03

Family

ID=16041369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5178030A Withdrawn JPH0732103A (en) 1993-07-19 1993-07-19 Nozzle for casting molten metal

Country Status (1)

Country Link
JP (1) JPH0732103A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10314905A (en) * 1997-05-19 1998-12-02 Shinagawa Refract Co Ltd Continuous casting nozzle for steel
US7244730B2 (en) 2001-04-19 2007-07-17 Eisai Co., Ltd 2-iminopyrrolidine derivatives
US7375236B2 (en) 2003-02-19 2008-05-20 Eisai Co., Ltd. Methods for producing cyclic benzamidine derivatives

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10314905A (en) * 1997-05-19 1998-12-02 Shinagawa Refract Co Ltd Continuous casting nozzle for steel
US7244730B2 (en) 2001-04-19 2007-07-17 Eisai Co., Ltd 2-iminopyrrolidine derivatives
US7304083B2 (en) 2001-04-19 2007-12-04 Eisai R&D Management Co., Ltd. 2-iminoimidazole derivatives (2)
US7476688B2 (en) 2001-04-19 2009-01-13 Eisai R&D Management Co., Ltd. Cyclic amidine derivatives
US7375236B2 (en) 2003-02-19 2008-05-20 Eisai Co., Ltd. Methods for producing cyclic benzamidine derivatives

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