JPH0724557A - Nozzle for casting molten metal - Google Patents

Nozzle for casting molten metal

Info

Publication number
JPH0724557A
JPH0724557A JP5153713A JP15371393A JPH0724557A JP H0724557 A JPH0724557 A JP H0724557A JP 5153713 A JP5153713 A JP 5153713A JP 15371393 A JP15371393 A JP 15371393A JP H0724557 A JPH0724557 A JP H0724557A
Authority
JP
Japan
Prior art keywords
nozzle
molten metal
cao
composition
present
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
Application number
JP5153713A
Other languages
Japanese (ja)
Other versions
JP2845090B2 (en
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 JP5153713A priority Critical patent/JP2845090B2/en
Publication of JPH0724557A publication Critical patent/JPH0724557A/en
Application granted granted Critical
Publication of JP2845090B2 publication Critical patent/JP2845090B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To prevent or reduce the clogging of a molten metal pouring nozzle when the Al-deoxidized molten metal is poured by specifying the composition of the nozzle for pouring the molten metal and the apparent porosity. CONSTITUTION:When the molten metal of the total oxygen content T.O>=5ppm is poured, the internal-mounting type or integrated type nozzle for casting has the composition consisting of, by weight, 70-95% Cab, and the balance one or more kinds of Al2O3, SiO2, MgO, Cr2O3, ZrO2, and C, and the apparent porosity is <=50%. In addition, as required, the waterproof resin is coated on the nozzle surface. The heat shock resistance and the spalling resistance can be improved by using the nozzle having such composition. The contact with the water content in the air is shut off by coating the waterproof resin on the inside surface of the nozzle. Thus, even when a large amount of Al2O3 inclusion in the molten steel is attached thereto, the concentration of CaO in the nozzle is high, and the melting point of the reaction product between the nozzle and the inclusion does not become high, and no nozzle inclusion is attached.

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
融金属の鋳造用ノズルに関する。
FIELD OF THE INVENTION The present invention relates to a nozzle for casting 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 (特開昭55−1144
49号公報、特開平3−138054号公報参照) 。
When the nozzle is clogged, adhered inclusions cause defects in the product and hinder the continuation of the casting operation. Various measures have been taken in the past for the purpose of preventing or reducing the nozzle clogging that occurs in this way (Japanese Patent Laid-Open No. 55-1144).
49, JP-A-3-138054).

【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 介在物を剥離させるこ
とにより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 is reduced,
In addition, measures are taken to prevent nozzle clogging by peeling off Al 2 O 3 inclusions adhering to the inner surface of the nozzle. 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】材質面からのノズル閉塞の防止策としてCa
O 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方策がある。
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ノズル閉塞を
防止するというものである。
As a measure to prevent nozzle clogging from the material side, Ca
O content, such as ZrO 2 -CaO-based refractory is 30% or less
There is a strategy to use CaO refractory as the 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. However, it is absorbed inside the nozzle or washed away by molten steel to prevent nozzle clogging.

【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0.0010%以上と
Al2O3 量が高い場合、ノズル閉塞防止の効果が期待でき
るとは限らないことが判明した。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、スポーリングを起こし
やすく作業性が非常に悪い。従って、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 the nozzle clogging by using the CaO refractory material as the nozzle material is as follows.
Since the CaO concentration in the nozzle is 30 wt% or less, it is 0.0010% or more as in the Al deoxidized molten steel that is generally found today.
It was found that when the amount of Al 2 O 3 is high, the effect of preventing nozzle clogging cannot always be expected. This is because even if Al 2 O 3 and CaO react to form a low melting point substance at first, CaO in the nozzle
This is because as the concentration decreases, the melting point of the reaction product of Al 2 O 3 and CaO increases, and eventually it adheres to the nozzle wall. To solve these problems, the CaO concentration should be increased, but refractories with high CaO concentration are prone to spalling and have poor workability. Therefore, at present, the problem of blockage of the immersion nozzle 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、気孔率と組成とを適切に調
整することにより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
As a result of various studies, focusing on the fact that CaO reacts with the formation of low-melting point substances, the thermal shock resistance and spalling resistance are greatly improved by adjusting the porosity and composition appropriately. That is, 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。
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 water, it is difficult to handle and heat Due to its low impact resistance, it was difficult to use at the level of actual operation.

【0010】しかし、本発明者らは、これまでの研究開
発の結果、気孔率が50%以下であって、Al2O3 、SiO2
MgO 、Cr2O3 、ZrO2、Cの少なくとも1種を合計で5〜
30%、70〜95%CaO からなる組成を有するノズルを用い
ることにより耐熱衝撃性、耐スポーリング性を向上させ
得ることを知った。
However, as a result of research and development so far, the present inventors have found that the porosity is 50% or less, and that Al 2 O 3 , SiO 2 ,
At least one of MgO, Cr 2 O 3 , ZrO 2 , and C is 5 to 5 in total.
It was found that thermal shock resistance and spalling resistance can be improved by using a nozzle having a composition of 30% and 70 to 95% CaO.

【0011】また、耐水性樹脂をノズル内表面の内部に
まで塗布して大気中の水分との接触を遮断することで、
CaO の吸湿性の問題を解決できることも知った。したが
って、上述のような構成を採ることによって、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。
Further, by coating the inside of the nozzle with a water resistant resin to block contact with moisture in the atmosphere,
I also found that it can solve the problem of hygroscopicity of CaO. Therefore, by adopting the configuration as described above,
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.

【0012】ここに、本発明の要旨とするところは、Ca
O 70〜95wt%、残部 Al2O3、SiO2、MgO 、Cr2O3 、Zr
O2、Cの1種類以上合計で5〜30wt%から成る組成を有
し、見かけ気孔率50%以下であり、さらに必要に応じ
て、内表面に耐水性樹脂をコーティングしたことを特徴
とする内装型又は一体型である溶融金属の鋳造用ノズル
である。
Here, the gist of the present invention is that Ca
O 70 to 95 wt%, balance Al 2 O 3 , SiO 2 , MgO, Cr 2 O 3 , Zr
It is characterized in that it has a composition of 5 to 30 wt% in total of one or more of O 2 and C, has an apparent porosity of 50% or less, and optionally coats a water resistant resin on the inner surface. It is a nozzle for casting molten metal which is an internal type or an integrated type.

【0013】なお、「内装型」とは、母材ノズルのノズ
ル内直胴部または吐出孔部にCaO 系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
セットしたCaO 系ノズルである。
The "internal type" is a CaO-based nozzle fitted in the straight body portion or the discharge hole of the base material nozzle, and the "integral type" uses a different material in the slag line portion. It is a set CaO nozzle.

【0014】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Al 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.

【0015】[0015]

【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、耐スポー
リング性、耐吸湿性に優れ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 has excellent spalling resistance and moisture absorption resistance and is capable of preventing nozzle clogging.

【0016】本発明において重要な点は、耐スポーリ
ング性向上のためAl2O3 、SiO2、MgO 、Cr2O3 、ZrO2
Cを1種以上合計で5〜30%含有し、見かけ気孔率を50
%以下とし耐吸湿性向上のため耐水性コーティングを
したことの3点である。
An important point in the present invention is Al 2 O 3 , SiO 2 , MgO, Cr 2 O 3 , ZrO 2 , for improving spalling resistance.
It contains 5 to 30% of C in total and has an apparent porosity of 50.
% Or less, and there are three points of having a water resistant coating for improving the moisture absorption resistance.

【0017】従来よりノズル閉塞の防止策としてノズル
に付着する溶鋼中の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Al2O3 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。
Conventionally, as a measure 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 the inclusion of inclusions in the nozzle. However, with the existing materials, the effect of preventing nozzle clogging cannot always be expected when the amount of Al 2 O 3 in the molten steel is large, especially when Al is deoxidized.

【0018】これはAl2O3 介在物とノズルの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 の反応生成物の融点は高くな
り、最終的にはノズル内壁に付着してしまうからであ
る。
This is because even if the Al 2 O 3 inclusions react with CaO in the nozzle to initially form a low-melting substance, when the CaO concentration in the nozzle decreases, the melting point of the reaction product of Al 2 O 3 and CaO. Is high and eventually adheres to the inner wall of the nozzle.

【0019】本発明のCaO 系ノズルは高純度、高濃度で
あり従来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Al
2O3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るため耐吸湿性が向上し、作業性の
問題も解決される。
The CaO 2 type nozzle of the present invention is a high-purity, high-concentration melt-loss type nozzle different from the conventional type. This CaO
The system nozzle has a high CaO concentration in the nozzle, so the Al in molten steel is
Even if a large amount of 2 O 3 -based inclusions are attached, the melting point of the reaction product of the nozzle and the inclusions does not increase, so that the inclusions do not attach to the nozzle. As a result, nozzle clogging is prevented, the composition is adjusted, the problem of spalling is solved because it has an appropriate porosity, and moisture resistance is improved because the nozzle is coated with a water resistant resin, which improves workability. The problem of is solved.

【0020】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, but TO <
This is because the amount of Al 2 O 3 is small at 5 ppm and the inclusion of inclusions is not seen.

【0021】図1にCaO 濃度を変えた組成のノズルを用
いて実施例と同成分の溶鋼 ([Ti]=0 wt%、sol.[Al]=
0.06wt%) を慣用の条件下で注湯した時の結果をグラフ
で示す。なお、CaO 以外は主にMgO であった。T.O.≧5
ppm であった。
FIG. 1 shows a molten steel having the same composition as the embodiment ([Ti] = 0 wt%, sol. [Al] =) by using a nozzle having a composition in which the CaO concentration is changed.
The result when pouring 0.06 wt%) under the conventional condition is shown in the graph. The main components were MgO, except for CaO. TO ≧ 5
It was ppm.

【0022】CaO 70%以上である本発明のCaO 系ノズル
には介在物の付着はみられなかったが、本発明において
規定するCaO 濃度域より低いCaO 濃度では介在物のノズ
ル付着がみられた。これらの結果からノズル閉塞を防止
するためにはノズル中のCaO濃度は70wt%以上必要であ
る。しかし、95%を越えると他の成分が過度に減少して
しまい、耐スポーリング性確保が困難となる。
Inclusion of inclusions was not observed in the CaO-based nozzle of the present invention having CaO of 70% or more, but nozzle adhesion of inclusions was observed at a CaO concentration lower than the CaO concentration range specified in the present invention. . From these results, the CaO concentration in the nozzle must be 70 wt% or more to prevent the nozzle clogging. However, if it exceeds 95%, other components are excessively reduced, and it becomes difficult to secure spalling resistance.

【0023】ノズルの加熱 (800 ℃30分間保持その後空
冷) を行い、耐スポーリング性を調査した結果を表1に
示す。なお、スポーリング性は、○: ワレなし、×: ワ
レありによって評価した。
Table 1 shows the results of examination of spalling resistance by heating the nozzle (holding at 800 ° C. for 30 minutes and then air cooling). In addition, the spalling property was evaluated by ◯: no crack and ×: crack.

【0024】本発明にかかるノズル (試料No.A、B)には
割れやクラック等の欠陥はなかったが、本発明にかかる
ノズルと同じく気孔率が4%であるがCaO 100 %のもの
(C)にはクラックが入っていた。なお、試料No.Eは加熱
試験では欠陥はみられなかったが、前述のように介在物
の付着がみられるため本発明の範囲外となる。
Nozzles according to the present invention (Sample Nos. A and B) did not have defects such as cracks and cracks, but like the nozzle according to the present invention, the porosity is 4% but CaO is 100%.
(C) had cracks. Although no defect was observed in the sample No. E in the heating test, the inclusion of inclusions was observed as described above, which is outside the scope of the present invention.

【0025】また本発明と同組成で気孔率60%のもの
(D) は、欠陥はなく耐スポーリング性は良好であった
が、通鋼時ノズルの物理的破損が一部観察された。これ
らの結果から耐スポーリング性向上のためには本発明の
成分組成でしかも気孔率が50%以下必要であることがわ
かる。
Further, the same composition as that of the present invention having a porosity of 60%
In (D), there were no defects and the spalling resistance was good, but some physical damage to the nozzle was observed during steel passing. From these results, it is understood that the composition of the present invention requires porosity of 50% or less to improve spalling resistance.

【0026】次に、耐吸湿性の調査のため本発明のノズ
ル耐火物と、本発明のノズル耐火物でコーティングなし
の耐火物を大気中に放置し、耐火物が大気中の水分を吸
収することによる重量変化率を調査した。耐火物組成は
表2に示す。コーティング材はレインコート (商品名)
を表面3秒間噴射して塗布したものであった。
Next, in order to investigate the moisture absorption resistance, the nozzle refractory of the present invention and the nozzle refractory of the present invention which is not coated are left in the atmosphere, and the refractory absorbs moisture in the atmosphere. The rate of weight change due to this was investigated. The refractory composition is shown in Table 2. The coating material is a raincoat (trade name)
Was sprayed on the surface for 3 seconds and applied.

【0027】結果を図2に示す。図2より本発明のノズ
ル耐火物はコーティングなしの耐火物と比較して重量変
化率は小さく耐吸湿性は向上されていることが分かる。
なお、重量変化率は次式で求めた。
The results are shown in FIG. It can be seen from FIG. 2 that the nozzle refractory of the present invention has a smaller weight change rate and improved moisture absorption resistance as compared with the refractory without coating.
The weight change rate was calculated by the following formula.

【0028】[0028]

【数1】 [Equation 1]

【0029】本発明において用いられる耐水性樹脂とし
てはその他レインガード (商品名)等が挙げられる。
Other examples of the water resistant resin used in the present invention include Rainguard (trade name).

【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3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%、T.O.=30ppm)を従来使用している
表4に示す組成の本発明にかかる一体型のCaO 系ノズル
と表5に示す組成のアルミナグラファイトノズルを用い
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. Ultra-low carbon steel containing Ti, which is said to be likely to cause nozzle clogging by adding Ti and Al to molten steel with the composition shown in Table 3 (s
ol. [Al] = 0.06 wt%, TO = 30 ppm), which was conventionally used, and was injected using the integrated CaO 3 nozzle of the present invention having the composition shown in Table 4 and the alumina graphite nozzle having the composition shown in Table 5. A hot water experiment was conducted. Pouring temperature is 1600 ℃, molten steel amount is 200
It was kg.

【0031】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
着状況をそれぞれ図3、4に示す。図3、4より従来使
用している表5の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 (表4試
験No.1) 、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。
The state of inclusions adhering to the nozzle of the present invention and the state of adhering inclusions to the alumina graphite nozzle at this time are shown in FIGS. Compared to the case of using the alumina graphite nozzle of Table 5 which is conventionally used from FIGS. 3 and 4, when the nozzle of the present invention is used (Table 4 test No. 1), adhesion of inclusions to the nozzle does not occur. No nozzle blockage occurs.

【0032】また表6に本発明にかかるノズルならびに
アルミナグラファイトノズルを用いてTi添加極低炭素鋼
以外のAl脱酸鋼の注湯実験を行った結果を示す。表6よ
り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ことがわかる。
Table 6 shows the results of pouring experiments of Al deoxidized steels other than Ti-added ultra-low carbon steel using the nozzle according to the present invention and the alumina graphite nozzle. It can be seen from Table 6 that when the nozzle of the present invention is used, adhesion of inclusions to the nozzle does not occur and nozzle clogging does not occur as compared with the case where the alumina graphite nozzle is used.

【0033】[0033]

【表1】 [Table 1]

【0034】[0034]

【表2】 [Table 2]

【0035】[0035]

【表3】 [Table 3]

【0036】[0036]

【表4】 [Table 4]

【0037】[0037]

【表5】 [Table 5]

【0038】[0038]

【表6】 [Table 6]

【0039】[0039]

【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CaO 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 CaO 2 concentration in the nozzle composition and the amount of inclusions deposited on the inner surface of the nozzle.

【図2】ノズル耐火物を大気中に放置したときのノズル
耐火物の重量変化率の変化を示すグラフである。
FIG. 2 is a graph showing changes in the weight change rate of the nozzle refractory when the refractory nozzle is left in the atmosphere.

【図3】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. 3 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 in the case of casting Ti-containing ultra-low carbon steel that is likely to cause nozzle clogging. It is a graph which shows.

【図4】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. 4 is a graph showing the relationship between the amount of inclusions attached to the nozzle and the Ti concentration in the steel when a Ti-containing ultra-low carbon steel is cast using a conventionally used alumina graphite nozzle.

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成5年8月11日[Submission date] August 11, 1993

【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】請求項1[Name of item to be corrected] Claim 1

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 全酸素含有量T.0≧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 70〜95wt%、残部がAl2O3
SiO2、Mg、Cr2O3 、ZrO2、Cの1種以上から成り、見か
け気孔率が50%以下であることを特徴とする溶融金属の
鋳造用ノズル。
1. An internal or integral casting nozzle used when pouring molten metal having a total oxygen content of T.0 ≧ 5 ppm, the composition of which is CaO 70 to 95 wt%, and the balance is Al 2 O 3 ,
A nozzle for casting a molten metal, which is made of one or more of SiO 2 , Mg, Cr 2 O 3 , ZrO 2 , and C and has an apparent porosity of 50% or less.
【請求項2】 さらに、ノズル内表面に耐水性樹脂コー
ティング層を設けたことを特徴とする請求項1記載の鋳
造用ノズル。
2. The casting nozzle according to claim 1, further comprising a water resistant resin coating layer provided on the inner surface of the nozzle.
JP5153713A 1993-06-24 1993-06-24 Nozzle for casting molten metal Expired - Fee Related JP2845090B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5153713A JP2845090B2 (en) 1993-06-24 1993-06-24 Nozzle for casting molten metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5153713A JP2845090B2 (en) 1993-06-24 1993-06-24 Nozzle for casting molten metal

Publications (2)

Publication Number Publication Date
JPH0724557A true JPH0724557A (en) 1995-01-27
JP2845090B2 JP2845090B2 (en) 1999-01-13

Family

ID=15568476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5153713A Expired - Fee Related JP2845090B2 (en) 1993-06-24 1993-06-24 Nozzle for casting molten metal

Country Status (1)

Country Link
JP (1) JP2845090B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005018851A1 (en) * 2003-08-22 2005-03-03 Krosakiharima Corporation Immersion nozzle for continuous casting of steel and meethod for continuous casting of steel using the immersion nozzle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005018851A1 (en) * 2003-08-22 2005-03-03 Krosakiharima Corporation Immersion nozzle for continuous casting of steel and meethod for continuous casting of steel using the immersion nozzle
US7275584B2 (en) 2003-08-22 2007-10-02 Krosakiharima Corporation Immersion nozzle for continuous casting of steel and continuous steel casting method using same
CN100372633C (en) * 2003-08-22 2008-03-05 黑崎播磨株式会社 Immersion nozzle for continuous casting of steel and method for continuous casting of steel using the immersion nozzle

Also Published As

Publication number Publication date
JP2845090B2 (en) 1999-01-13

Similar Documents

Publication Publication Date Title
JP2542585B2 (en) Immersion nozzle for continuous casting
JPH0724557A (en) Nozzle for casting molten metal
JP3124421B2 (en) Immersion nozzle for continuous casting
JPH07232249A (en) Nozzle for casting molten metal
JPH0732103A (en) Nozzle for casting molten metal
JP2001179406A (en) Nozzle for continuous casting and continuous casting method
KR100258131B1 (en) Nozzle for continuous casting
JP4377002B2 (en) Gas injection upper nozzle for molten metal container open / close nozzle
JP3519213B2 (en) Top nozzle and stopper head for continuous casting
JP2718271B2 (en) Repairing and extending the life of alumina refractories
JPH08132200A (en) Casting method of molten metal
JPH03138054A (en) Submerged nozzle for continuous casting
JPH0751822A (en) Heat insulating agent for molten steel surface
JP3779785B2 (en) Highly airtight packing material for refractories
JPS62104654A (en) Nozzle for continuous casting
JP2005060128A (en) Refractory
JPH07124741A (en) Surface heat insulating material for molten steel
JPH0413453A (en) Flux for casting and method for casting la-containing steel using this flux
JPH09276998A (en) Method for reusing immersion nozzle for continuously casting steel
JPH04158963A (en) Nozzle for continuous casting
JPH08103865A (en) Pouring nozzle of molten metal
JPH04158962A (en) Nozzle for continuous casting
JP3505193B2 (en) Refractory
JPS641954Y2 (en)
JPH0833961A (en) Continuous casting method

Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 19980929

LAPS Cancellation because of no payment of annual fees