JPS5997573A - Steeping nozzle for continuous casting - Google Patents
Steeping nozzle for continuous castingInfo
- Publication number
- JPS5997573A JPS5997573A JP57204567A JP20456782A JPS5997573A JP S5997573 A JPS5997573 A JP S5997573A JP 57204567 A JP57204567 A JP 57204567A JP 20456782 A JP20456782 A JP 20456782A JP S5997573 A JPS5997573 A JP S5997573A
- Authority
- JP
- Japan
- Prior art keywords
- zirconia
- graphite
- continuous casting
- corrosion resistance
- silicon nitride
- 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.)
- Pending
Links
Landscapes
- Continuous Casting (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
され溶鋼の酸化防止、モールド内での溶ｆｉＲ流制御ス
ズラッシュ及びスラグの巻き込み防止を目的に使用され
ている連続ｎ造用浸漬ノズルの改良に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a submerged nozzle for continuous n-molding, which is used for the purpose of preventing oxidation of molten steel, controlling the molten steel flow in a mold, preventing tin lash and slag entrainment.
従来これらの浸漬ノズルとしては良品質の鋳片性状を得
るためにまた鋼の連続鋳造を円滑に操業するために耐ス
ポール性、溶鋼に対する耐食性、気密性の面から黒鉛−
アルミナ質が使用されてきた。Conventionally, these immersion nozzles have been made of graphite in order to obtain high-quality slab properties and to ensure smooth operation of continuous steel casting in terms of spall resistance, corrosion resistance to molten steel, and airtightness.
Alumina has been used.
同材質はモールドパウダーに対する耐食性にに劣るとい
う欠点があるが、一般にこの対策として黒鉛−ジルコニ
ア質をパウダーライン部に局部的に配役せしめた浸漬ノ
ズルが使用されている。しかしながら近年ますます志向
されてきている多連続鋳造には耐用不足の問題が提示さ
れている。This material has the disadvantage of poor corrosion resistance against mold powder, but as a countermeasure to this problem, an immersion nozzle in which graphite-zirconia is locally applied to the powder line portion is generally used. However, multi-continuous casting, which has become increasingly popular in recent years, presents the problem of insufficient durability.
本発明者らはモールドパウダーに対する耐食性について
検討した結果、同材質がモールドパウダーに対し優れた
耐食性を示すのは次の通りであることが判った。The present inventors investigated the corrosion resistance against mold powder and found that the same material exhibits excellent corrosion resistance against mold powder for the following reasons.
すなわら黒鉛−アルミナ質においてはカーボンボンドが
溶鋼への溶解や空気による酸化で消失した場合アルミナ
骨材が粒のまま流出し損傷されるのに対し、黒鉛−ジル
コニア質においてはジルコニア骨材が溶鋼やモールドパ
ウダーと濡れ難いため容易に流出しない。したがって優
れた耐食性を示すものである。しかしながらジルコニア
は変態膨張を生じる際会解し細かい粒形に変化して徐々
に流出してい（ため若干ながら損傷する。In other words, in the case of graphite-alumina, when the carbon bond disappears due to dissolution in molten steel or oxidation in the air, the alumina aggregate flows out as particles and is damaged, whereas in the case of graphite-zirconia, the zirconia aggregate is It does not easily get wet with molten steel or mold powder, so it does not leak out easily. Therefore, it exhibits excellent corrosion resistance. However, when zirconia undergoes transformation and expansion, it disintegrates, changes into fine grains, and gradually flows out (thereby causing some damage).
黒鉛−ジルコニア質においてはジルコニア量を増加させ
ると耐食性は更に改善されるが、変態膨張に起因して鋳
造スタート時の耐スポール性に劣ることとなる。In graphite-zirconia, corrosion resistance is further improved by increasing the amount of zirconia, but due to transformation expansion, spalling resistance at the start of casting is inferior.
本発明はこの問題点を有したジルコニア−黒鉛質につい
て窒化珪素を添加することにより耐食性、耐スポール性
共に改善した連続鋳造用浸漬ノズルを提出するものであ
る。その要旨とするところは重量比でジルコニア５３〜
７．７チ、窒化珪素７．２〜２７％、黒鉛／／〜λ３％
及び炭化珪素または金属珪素の７種または、２種３〜１
０％からなる組成を有することを特徴とする連続鋳造用
浸漬ノズルである。The present invention proposes an immersion nozzle for continuous casting in which corrosion resistance and spalling resistance are improved by adding silicon nitride to zirconia-graphite, which has this problem. The gist of this is that the weight ratio of zirconia is 53~
7.7chi, silicon nitride 7.2~27%, graphite//~λ3%
and 7 types or 2 types of silicon carbide or metal silicon 3 to 1
This immersion nozzle for continuous casting is characterized by having a composition consisting of 0%.
すなわち本発明はジルコニアと比べて若干劣るが、アル
ミナ等の他原料と比べて溶鋼やモールドパウダーに対し
て濡れ難い特性を有する窒化珪素を適当量添加するもの
である。黒鉛−窒化珪素質のモールドパウダーに対する
耐食性は黒鉛−ジルコニア質と比べ骨材の濡れ性や空気
中酸素の酸化に基づき若干劣るが、逆に耐スポール性に
ついては膨張率が極めて低いために優れている。すなわ
ち窒化珪素量が多くても耐スポール性は良好である。こ
のような特徴を有する窒化珪素を黒鉛−ジルコニア質と
組み合わせた場合、以上のような理由から耐スポール性
を劣化さｂずに総り的な骨材量を増加させ耐食性をｄｌ
、 Ｍ −ｊ にとが可能である。更にジルコニア−窒
化珪素−黒鉛質においては、稼動面において分解したジ
ルコニア細粒と空気中の酸素により若干酸化した窒化珪
素から生成するシリカがモールドパウダーと反応して粘
性の高いガラスが形成される。このためモールドパウダ
ーの侵入が抑制されるという相乗効果により耐食性は改
善されるものである。That is, the present invention adds an appropriate amount of silicon nitride, which is slightly inferior to zirconia but has the property of being less wettable by molten steel and mold powder than other raw materials such as alumina. The corrosion resistance of graphite-silicon nitride to mold powder is slightly inferior to that of graphite-zirconia due to aggregate wettability and oxidation of oxygen in the air, but on the other hand, spalling resistance is superior due to the extremely low expansion rate. There is. That is, even if the amount of silicon nitride is large, the spalling resistance is good. When silicon nitride, which has these characteristics, is combined with graphite-zirconia, it is possible to increase the total amount of aggregate without deteriorating spalling resistance and improve corrosion resistance for the reasons mentioned above.
, M −j is possible. Furthermore, in the case of zirconia-silicon nitride-graphite, silica produced from zirconia fine particles decomposed on the working surface and silicon nitride slightly oxidized by oxygen in the air reacts with the mold powder to form a highly viscous glass. Therefore, corrosion resistance is improved due to the synergistic effect of suppressing the penetration of mold powder.
以上の本発明のジルコニア−窒化珪素−黒鉛質を連続鋳
造用浸漬ノズルに適用することにより大巾な多連続鋳造
が可能となった。By applying the above-mentioned zirconia-silicon nitride-graphite material of the present invention to a continuous casting immersion nozzle, wide-scale multi-continuous casting has become possible.
本発明においてジルコニア祉については５３チ未満では
耐食性に劣り、また７３チを超えると変態膨張が顕著と
なり耐スポール性に劣ることとなる。従って５３〜７３
％の配合、！１（が望ましい。°黒鉛の配合はについて
は７７％未満でＧま耐スポール性に劣り、コ３％を超す
と溶鋼による侵食または空気による酸化消失が生じ耐食
性力（劣ることとなるので７７〜．２３％の範囲が望ま
しい。In the present invention, if the zirconia thickness is less than 53 degrees, the corrosion resistance will be poor, and if it exceeds 73 degrees, the transformation expansion will be significant and the spall resistance will be poor. Therefore 53-73
% combination,! 1 (desirably.) If the graphite content is less than 77%, the spall resistance will be poor, and if it exceeds 3%, it will be eroded by molten steel or lost by oxidation in the air, resulting in poor corrosion resistance. A range of .23% is desirable.
一方、窒化珪素の配合量については７７％未満では弱酸
化した窒化珪素から生成するシリカ猷が少な（高粘性の
ガラスが形成されζこくいし、２ｇ％を超すと主要成分
としてのジルコニア量の配合比率が低下し耐食性を劣化
させること（こナルので、ｌ−〜コク条の範囲が望まし
い。また炭化珪素及び金属珪素は使用中の酸化防止を目
的として添加するものであるがその配合ｉ４こついては
３チ未満ではその効果が小さく７０％を超えると耐食性
に劣ることとなる。従って３〜ＩＯ％の範囲が望ましい
。On the other hand, if the amount of silicon nitride is less than 77%, there will be less silica produced from weakly oxidized silicon nitride (a highly viscous glass will be formed), and if it exceeds 2g%, the amount of zirconia as the main component will be reduced. The ratio will decrease and the corrosion resistance will deteriorate (this is why the range of 1- to 100% is desirable.Also, silicon carbide and metallic silicon are added for the purpose of preventing oxidation during use, but their formulation i4 If it is less than 3%, the effect will be small, and if it exceeds 70%, the corrosion resistance will be poor.Therefore, a range of 3 to IO% is desirable.
次に実施例について説明する。Next, an example will be described.
実施例１
表／に示したジルコニア−黒鉛の従来材質をパウダーラ
イン部３０ ｍｍ の厚みで配役せしめた浸漬ノズル
を容量、２．ｔＯトン取鍋の速読鋳造に使用したところ
Ａ／はＳチャージでノく−ウダーライン部に穴あきが生
じ、またＡ、２は鋳込初期にパウダーライン部付近に縦
きれつが発生し鋳込を中止した。Example 1 An immersion nozzle made of the conventional material of zirconia-graphite shown in Table 1 with a thickness of 30 mm at the powder line part was constructed with a capacity of 2. When used for quick casting of a tO ton ladle, A/ was S-charged and had a hole in the powder line, and A and 2 had vertical cracks near the powder line in the early stages of casting. has been discontinued.
一方本発明のジルコニア−窒化珪素−黒鉛の材質を同様
にパウダーライン部に配設せしめた浸漬ノズルを使用し
たところ鋳込初期の割れも発生せず最高７２チヤージを
耐用し本材質の優ｉ／ 本発明の配合例及び品質衣
＝ ／
※２ 溶１鋳湯試験On the other hand, when an immersion nozzle in which the zirconia-silicon nitride-graphite material of the present invention was similarly arranged in the powder line part was used, no cracking occurred at the initial stage of casting and it could withstand up to 72 charges. Blend example and quality coating of the present invention = / *2 Melt 1 casting test
Claims (1)
、黒鉛／／〜２３％および炭化珪素または金属珪素の７
種またはユ種３〜ｉｏ％からなる組成を有することを特
徴とする連続鋳造用浸漬ノズノνZirconia 53-73% Silicon nitride 12-27% by weight
, graphite //~23% and silicon carbide or silicon metal 7
Immersion nozzle ν for continuous casting characterized by having a composition consisting of 3 to io% of seeds or seeds
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57204567A JPS5997573A (en) | 1982-11-24 | 1982-11-24 | Steeping nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57204567A JPS5997573A (en) | 1982-11-24 | 1982-11-24 | Steeping nozzle for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5997573A true JPS5997573A (en) | 1984-06-05 |
Family
ID=16492605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57204567A Pending JPS5997573A (en) | 1982-11-24 | 1982-11-24 | Steeping nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5997573A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0242849A2 (en) * | 1986-04-21 | 1987-10-28 | Vesuvius Crucible Company | Carbon bonded refractory bodies |
-
1982
- 1982-11-24 JP JP57204567A patent/JPS5997573A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0242849A2 (en) * | 1986-04-21 | 1987-10-28 | Vesuvius Crucible Company | Carbon bonded refractory bodies |
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