JP2651444B2 - Immersion nozzle for continuous casting of steel - Google Patents
Immersion nozzle for continuous casting of steelInfo
- Publication number
- JP2651444B2 JP2651444B2 JP62220691A JP22069187A JP2651444B2 JP 2651444 B2 JP2651444 B2 JP 2651444B2 JP 62220691 A JP62220691 A JP 62220691A JP 22069187 A JP22069187 A JP 22069187A JP 2651444 B2 JP2651444 B2 JP 2651444B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- steel
- immersion nozzle
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は鋼の連続鋳造用浸漬ノズルに関する。Description: TECHNICAL FIELD The present invention relates to an immersion nozzle for continuous casting of steel.
従来、連続鋳造用浸漬ノズルとしては、アルミナ−グ
ラファイト質や、ジルコニア−グラファイト質のものが
多用されている。これらの材質は溶鋼に対して高耐食性
を示す。ところが、高熱伝導性のために地金が付着しや
すいという欠点がある。また、特にアルミキルド鋼等の
アルミニウム添加量が多い鋼では、アルミニウム酸化物
の付着によりノズル閉塞が起き、鋳込みを中断しなけれ
ばならなくなる。Conventionally, as an immersion nozzle for continuous casting, an alumina-graphite material or a zirconia-graphite material has been frequently used. These materials show high corrosion resistance to molten steel. However, there is a disadvantage that the metal is easily attached due to high thermal conductivity. In addition, in the case of steel containing a large amount of aluminum, such as aluminum-killed steel, nozzle clogging occurs due to adhesion of aluminum oxide, and casting must be interrupted.
このうち地金付着による閉塞に対しては、予熱条件の
改善及び断熱等による防止対策がなされ、かなりの効果
がある。Among them, measures against the blockage due to the adhesion of the bullion are improved by improving the preheating condition and preventing the heat by heat insulation, and have a considerable effect.
一方、アルミニウム酸化物の付着による閉塞に対して
は、ノズル内孔面側に多孔耐火物を設けて不活性ガスを
吐出するスリット式浸漬ノズルが適用されている。しか
し、上記のスリット式浸漬ノズルには、以下のような問
題がある。On the other hand, for blocking due to adhesion of aluminum oxide, a slit-type immersion nozzle that discharges an inert gas by providing a porous refractory on the inner surface of the nozzle is used. However, the above-mentioned slit type immersion nozzle has the following problems.
すなわち、溶鋼の吐出口近傍にはスリットを配置する
ことが困難であるため、吐出口周辺での付近及び閉塞を
防止することは困難である。また、鋳込み回数が多くな
るにしたがい、多孔質耐火物中の炭素成分を酸化によっ
て消耗し、SiO2成分がＣ−CO還元雰囲気で反応してSiO
として揮散するため通気率が大きくなり、不活性ガスの
通気量をコントロールすることが困難となる。しかも、
不活性ガスの吐出量の増大により鋼片にピンホールが発
生しやすくなる。That is, since it is difficult to arrange the slit near the discharge port of the molten steel, it is difficult to prevent the vicinity and the blockage around the discharge port. Further, as the number of times of casting increases, the carbon component in the porous refractory is consumed by oxidation, and the SiO 2 component reacts in a C-CO reducing atmosphere to reduce the SiO 2 content.
As a result, the gas permeability increases, and it is difficult to control the amount of the inert gas to be ventilated. Moreover,
Pinholes are more likely to be generated in the billet due to an increase in the discharge amount of the inert gas.
そこで、浸漬ノズルの材質を改良することにより、閉
塞を防止しようとする種々の試みがなされている。例え
ば、特開昭57−71860号公報では、CaO−黒鉛系の耐火物
を用いることにより、ノズル成分と溶鋼中のAl2O3とを
反応させてCaO−Al2O3系低融点物質を生成させ、付着し
ようとするAl2O3を溶融除去しようとするものである。Therefore, various attempts have been made to prevent blockage by improving the material of the immersion nozzle. For example, in Japanese Patent Application Laid-Open No. 57-71860, by using a CaO-graphite-based refractory, a nozzle component reacts with Al 2 O 3 in molten steel to produce a CaO-Al 2 O 3 -based low-melting substance. It is intended to melt and remove Al 2 O 3 to be generated and adhered.
しかし、CaO−Al2O3系物質は必ずしも低融点物質にな
るとは限らず、逆に高融点物質が生成し、これが核とな
ってAl2O3が付着し、ノズル閉塞を起すおそれが大き
い。However, CaO-Al 2 O 3 based material is not necessarily composed of a low melting point material, a refractory material is produced in the reverse, which is adhered Al 2 O 3 at the core, a possibility is greater to cause nozzle clogging .
本発明は上記問題点を解決するためになされたもので
あり、ノズル内孔の閉塞を有効に防止できる連続鋳造用
浸漬ノズルを提供することを目的とする。The present invention has been made to solve the above problems, and an object of the present invention is to provide an immersion nozzle for continuous casting that can effectively prevent blockage of a nozzle inner hole.
本発明の鋼は連続鋳造用浸漬ノズルは、少なくともノ
ズル内孔の稼動面が、ZrO2;50〜94％、C;5〜40％、Si
O2;1〜10％、Al2O3及びY2O3の合計;5％以下、CaO及びMg
Oの合計;1％以下を含む耐火物からなることを特徴とす
るものである。In the steel of the present invention, the continuous casting immersion nozzle has at least a working surface of the nozzle inner hole of ZrO 2 ; 50 to 94%, C; 5 to 40%, Si
O 2 ; 1 to 10%, total of Al 2 O 3 and Y 2 O 3 ; 5% or less, CaO and Mg
It is characterized by being composed of a refractory containing not more than 1% of O.
なお、SiO2としては、酸化によりSiO2となる原料、例
えば、Si又はその合金を用いてもよい。As the SiO 2, the raw material to be SiO 2 by oxidation, for example, it may be used Si or an alloy thereof.
上記のような耐火物からなる浸漬ノズルは、ZrO2が主
成分であるため、溶鋼にぬれにくく酸化物の付着・成長
を抑制できる。また、Ｃを含んでいるため、良好な耐ス
ポーリング性を示す。更に、SiO2と、Al2O3及びY2O
3と、CaOおよびMgOという酸化物の含有量を規定したこ
とにより、ノズル内孔の稼動面にSiO2のガラス層が形成
される。このガラス層は溶解状態でノズル内孔の稼動面
を覆い、かつ溶損しない程度の粘性を有するので、稼動
面の平滑性を維持することができ、鋼中のAl2O3の析出
・付着を抑制してノズル閉塞を防止することができる。Since the immersion nozzle made of a refractory as described above contains ZrO 2 as a main component, the immersion nozzle is hardly wetted by molten steel and can suppress adhesion and growth of oxide. Also, since it contains C, it shows good spalling resistance. Furthermore, SiO 2 , Al 2 O 3 and Y 2 O
By defining the content of 3 and oxides of CaO and MgO, a glass layer of SiO 2 is formed on the working surface of the nozzle inner hole. This glass layer covers the working surface of the nozzle bore in the molten state and has such a viscosity that it does not melt, so that the smoothness of the working surface can be maintained and the precipitation and adhesion of Al 2 O 3 in steel. And nozzle blockage can be prevented.
本発明において、各成分の含有量を上記のように規定
したのは以下のような理由による。In the present invention, the content of each component is specified as described above for the following reason.
ZrO2が50％未満では耐食性が低下し、94％を超えると
Ｃ量が少なくなって耐スポーリング性が低下する。If ZrO 2 is less than 50%, the corrosion resistance decreases, and if it exceeds 94%, the amount of C decreases and the spalling resistance decreases.
Ｃが５％未満では耐食性が低下し、40％を超えても耐
食性が低下する。If C is less than 5%, the corrosion resistance decreases, and if C exceeds 40%, the corrosion resistance decreases.
SiO2が１％未満ではノズル内孔の稼動面においてガラ
ス層が形成されにくくなり閉塞防止効果が得られず、10
％を超えると耐食性が低下する。If the SiO 2 content is less than 1%, a glass layer is hardly formed on the working surface of the nozzle inner hole, and the effect of preventing clogging cannot be obtained.
%, The corrosion resistance decreases.
その他のAl2O3、Y2O3、CaO及びMgOは含まれていない
ことが望ましい。すなわち、Al2O3は閉塞物の主成分で
あるため、CaO、MgOおよびY2O3は鋼中のAl2O3と反応し
て高融点化合物を形成しこれを核としてAl2O3の付着が
促進される。また、CaO（又はMgO）−Al2O3-SiO2系ガラ
スが生成した場合、過剰に低融点化してノズルの溶損が
起る。したがって、上記の各成分はできるだけ少ない方
がよい。ただし、これらの成分は不純物としての混入が
不可避的である。したがって、本発明におけるこれらの
成分の含有量の規定はノズル内孔の閉塞防止効果を損な
わない程度の許容範囲という意味をもつものである。It is preferable that other Al 2 O 3 , Y 2 O 3 , CaO and MgO are not contained. That is, since Al 2 O 3 is the main component of the obstruction, CaO, MgO and Y 2 O 3 react with Al 2 O 3 in the steel to form a high melting point compound, which is used as a nucleus to form Al 2 O 3 Is promoted. Also, if the CaO (or MgO) -Al 2 O 3- SiO 2 based glass produced, melting of the nozzle occurs excessively low melting point. Therefore, it is better that each of the above components is as small as possible. However, it is inevitable that these components are mixed as impurities. Therefore, the definition of the content of these components in the present invention means an allowable range that does not impair the effect of preventing the nozzle inner hole from being blocked.
以下、本発明の実施例を説明する。 Hereinafter, embodiments of the present invention will be described.
第１図示すような、Al2O3−Ｃ質のノズル本体１、ZrO
2−Ｃ質のスラグライン部２、及びノズル内孔の稼動面
３からなる浸漬ノズルを製造した。ここで、ノズル内孔
の稼動面３を構成する耐火物としては、第１表に示す組
成を有するものを用いた。得られた13種の浸漬ノズルを
同一のタンディッシュに取付けてアルミキルド鋼の５連
鋳を行なった。そして、使用後の浸漬ノズルについて、
第１図に示すＡの位置での水平断面におけるノズル孔の
狭縮率を調べた結果を第１表に示す。なお、狭縮率をノ
ズル孔断面積に占める付着物断面積の比率である。As shown FIG. 1, the nozzle body 1 of the Al 2 O 3 -C quality, ZrO
An immersion nozzle comprising a 2- C quality slag line portion 2 and a working surface 3 of a nozzle inner hole was manufactured. Here, as the refractory constituting the working surface 3 of the nozzle inner hole, a refractory having a composition shown in Table 1 was used. The obtained 13 types of immersion nozzles were attached to the same tundish, and five consecutive castings of aluminum killed steel were performed. And about the immersion nozzle after use,
Table 1 shows the result of examining the narrowing ratio of the nozzle hole in the horizontal section at the position A shown in FIG. In addition, it is the ratio of the cross-sectional area of the adhering matter occupying the narrowing ratio to the cross-sectional area of the nozzle hole.
第１表から明らかなように、実施例１〜７の浸漬ノズ
ルは、従来品である比較例１及び本発明の組成範囲をは
ずれた比較例２〜６の浸漬ノズルと比較して、狭縮率が
1/3以下と低く閉塞防止効果が高いことがわかる。 As is clear from Table 1, the immersion nozzles of Examples 1 to 7 were narrower than those of Comparative Example 1 which is a conventional product and Comparative Examples 2 to 6 which were out of the composition range of the present invention. Rate is
It can be seen that the clogging prevention effect is high at 1/3 or less.
なお、上記実施例では、ノズル内孔の稼動面のみを所
定の耐火物で構成した浸漬ノズルを例示したが、上記耐
火物はスラグラインにも適用できるし、ノズル全体を上
記耐火物で構成してもよい。In the above-described embodiment, the immersion nozzle in which only the working surface of the nozzle inner hole is formed of a predetermined refractory is illustrated. However, the refractory can be applied to a slag line, and the entire nozzle is formed of the refractory. You may.
以上詳述したように本発明によれば、ノズル内孔の閉
塞を有効に防止できる連続鋳造用浸漬ノズルを提供でき
るものである。As described above in detail, according to the present invention, it is possible to provide a continuous casting immersion nozzle capable of effectively preventing the nozzle inner hole from being blocked.
第１図は本発明の実施例において製造された浸漬ノズル
の断面図である。 １……ノズル本体、２……スラグライン部、３……ノズ
ル内孔の稼動面。FIG. 1 is a sectional view of an immersion nozzle manufactured in an embodiment of the present invention. 1 ... nozzle body, 2 ... slag line section, 3 ... working surface of nozzle bore.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河合 和秀 愛知県刈谷市小垣江町南藤１番地 東芝 セラミックス株式会社刈谷製造所内 (72)発明者 森 弘之 愛知県刈谷市小垣江町南藤１番地 東芝 セラミックス株式会社刈谷製造所内 (72)発明者 大屋 鎖登志 愛知県刈谷市小垣江町南藤１番地 東芝 セラミックス株式会社刈谷製造所内 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuhide Kawai 1st Minamito, Ogakie-cho, Kariya-shi, Aichi Pref. Toshiba Ceramics Co., Ltd. (72) Inventor, Katsutoshi Oya, 1 Minamifuji, Ogakie-cho, Kariya-shi, Aichi Prefecture Toshiba Ceramics Co., Ltd.
Claims (1)
0〜94％、C;5〜40％、SiO2;1〜10％、Al2O3及びY2O3の
合計;5％以下、CaO及びMgOの合計;1％以下を含む耐火物
からなることを特徴とする鋼の連続鋳造用浸漬ノズル。The working surface of at least the nozzle inner hole is made of ZrO 2 ; 5
0~94%, C; 5~40%, SiO 2; 1~10%, the sum of Al 2 O 3 and Y 2 O 3; 5% or less, the total of CaO and MgO; from refractory containing less than 1% An immersion nozzle for continuous casting of steel.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62220691A JP2651444B2 (en) | 1987-09-03 | 1987-09-03 | Immersion nozzle for continuous casting of steel |
| AU21761/88A AU593997B2 (en) | 1987-09-03 | 1988-09-01 | A nozzle for discharging molten metal used in a casting device |
| KR1019880011432A KR910006897B1 (en) | 1987-09-03 | 1988-09-03 | A nozzle for discharging molten metal used in a casting device |
| AU45601/89A AU607359B2 (en) | 1987-09-03 | 1989-11-27 | A nozzle for discharging molten metal used in a casting device |
| US07/571,032 US5046647A (en) | 1987-09-03 | 1990-08-22 | Nozzle for discharging molten metal used in a casting device |
| KR1019910008690A KR930000004B1 (en) | 1987-09-03 | 1991-05-27 | Nozzle for discharging molten metal used in a casting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62220691A JP2651444B2 (en) | 1987-09-03 | 1987-09-03 | Immersion nozzle for continuous casting of steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6465069A JPS6465069A (en) | 1989-03-10 |
| JP2651444B2 true JP2651444B2 (en) | 1997-09-10 |
Family
ID=16754973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62220691A Expired - Lifetime JP2651444B2 (en) | 1987-09-03 | 1987-09-03 | Immersion nozzle for continuous casting of steel |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2651444B2 (en) |
| AU (1) | AU607359B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2575580B2 (en) * | 1993-01-28 | 1997-01-29 | 品川白煉瓦株式会社 | Carbon containing refractories |
| CN111168050B (en) * | 2020-01-10 | 2022-06-10 | 江苏沙钢集团有限公司 | High-corrosion-resistance core nozzle for strip continuous casting and manufacturing method thereof |
| CN113087539B (en) * | 2021-05-18 | 2022-06-21 | 江苏泰瑞耐火有限公司 | Refractory material for zirconia composite metering nozzle and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5912619A (en) * | 1982-07-13 | 1984-01-23 | Nippon Telegr & Teleph Corp <Ntt> | Automatic correcting method of analog-digital converter |
| JPS6186052A (en) * | 1984-10-02 | 1986-05-01 | Toshiba Ceramics Co Ltd | Immersion nozzle for continuous casting |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3507876A1 (en) * | 1985-03-06 | 1986-09-11 | Didier-Werke Ag, 6200 Wiesbaden | USE OF CEMENT-FREE VIBRATION MATERIALS BASED ON ALUMINUM OXIDE AND / OR ZIRCONIUM DIOXIDE FOR THE PRODUCTION OF WEARING PARTS |
| AU601999B2 (en) * | 1986-08-18 | 1990-09-27 | Ngk Insulators, Ltd. | High strength zirconia ceramic |
-
1987
- 1987-09-03 JP JP62220691A patent/JP2651444B2/en not_active Expired - Lifetime
-
1989
- 1989-11-27 AU AU45601/89A patent/AU607359B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5912619A (en) * | 1982-07-13 | 1984-01-23 | Nippon Telegr & Teleph Corp <Ntt> | Automatic correcting method of analog-digital converter |
| JPS6186052A (en) * | 1984-10-02 | 1986-05-01 | Toshiba Ceramics Co Ltd | Immersion nozzle for continuous casting |
Also Published As
| Publication number | Publication date |
|---|---|
| AU607359B2 (en) | 1991-02-28 |
| JPS6465069A (en) | 1989-03-10 |
| AU4560189A (en) | 1990-03-15 |
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