JPS63203258A - Immersion nozzle - Google Patents
Immersion nozzleInfo
- Publication number
- JPS63203258A JPS63203258A JP3519687A JP3519687A JPS63203258A JP S63203258 A JPS63203258 A JP S63203258A JP 3519687 A JP3519687 A JP 3519687A JP 3519687 A JP3519687 A JP 3519687A JP S63203258 A JPS63203258 A JP S63203258A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- mgo
- steel
- wall surface
- zro2
- 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
- 238000007654 immersion Methods 0.000 title claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 16
- 239000010959 steel Substances 0.000 abstract description 16
- 238000009749 continuous casting Methods 0.000 abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 239000000377 silicon dioxide Substances 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract 6
- 229910052681 coesite Inorganic materials 0.000 abstract 3
- 229910052906 cristobalite Inorganic materials 0.000 abstract 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract 3
- 229910052682 stishovite Inorganic materials 0.000 abstract 3
- 229910052905 tridymite Inorganic materials 0.000 abstract 3
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 230000035939 shock Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229910000655 Killed steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N Al2O Inorganic materials [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- WHOPEPSOPUIRQQ-UHFFFAOYSA-N oxoaluminum Chemical compound O1[Al]O[Al]1 WHOPEPSOPUIRQQ-UHFFFAOYSA-N 0.000 description 1
- 230000036619 pore blockages Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
（産業上の利用分野）
本発明は、鋼の連続鋳造用浸漬ノズルの改良に関するも
のである。
（従来の技術）
連続鋳造用浸漬ノズルを用いて、／ｌキルド鋼、Ａｌ−
３ｔキルド鋼等のＡＩｌ含有率の高い鋼を連続鋳造する
場合、浸漬ノズル内周壁にＡｌｔｏ、が付着し孔閉塞現
象が生ずる。
この孔閉塞は、■操業面では、多連鋳化の阻害要因とな
るばかりでなく、■品質面でも、ノズルからの吐出流の
偏流を引き起こし、モールド内での湯あばれを助長し、
表面欠陥の一因となる。特に最近の高連続鋳造化に伴い
、吐出流量が増大するため、■の要因が問題となってい
る。
従来、この種の鋼の連続鋳造には、アルミナ−黒鉛−シ
リカ質のものが用いられている。しかし、この材質は孔
閉塞に関し、以下の欠点を有している。
１）ノズル材質中の５ｉＯｚが（０）供給源となり、ノ
ズル内周壁−溶鋼界面部において下記０式のように鋼中
Ａｌを酸化し、界面でＡ １ ｚＯ：＋を生成する。
人！ｔ＋５ｉＯｔ −Ａｌ２Ｏ，（析出）十旦また、
ノズル材質中の黒鉛も下記０式のようにＳｉＯ□の還元
を助長する。
そして、ノズル内部からも(Industrial Application Field) The present invention relates to an improvement of a submerged nozzle for continuous casting of steel. (Prior art) Using a continuous casting immersion nozzle, /l killed steel, Al-
When continuously casting steel with a high Al content such as 3t killed steel, Alto adheres to the inner circumferential wall of the immersion nozzle, causing a hole clogging phenomenon. In terms of operation, this hole clogging not only obstructs multi-casting, but also in terms of quality, it causes uneven flow of the discharge flow from the nozzle and promotes hot water froth in the mold.
Contributes to surface defects. In particular, with the recent trend toward continuous casting, the discharge flow rate has increased, so factor (2) has become a problem. Conventionally, alumina-graphite-silica steel has been used for continuous casting of this type of steel. However, this material has the following drawbacks regarding pore clogging. 1) 5 iOz in the nozzle material becomes a (0) supply source, and at the nozzle inner peripheral wall-molten steel interface part, Al in the steel is oxidized as shown in the following formula 0, and A 1 zO:+ is generated at the interface. Man! t+5iOt -Al2O, (precipitation) Todan also,
Graphite in the nozzle material also promotes reduction of SiO□ as shown in equation 0 below. And from inside the nozzle
〔０〕が供給され、人ｌ十旦
→ Ａ／ｚＯ：＋ （析出）なる反応が起こる。
しかして、界面に析出したＡ １２０３を起点として、
鋼中に浮遊するＡ Ｉ！ ２０３クラスターの付着が発
達し、孔閉塞に至るのである。
２）アルミナ−黒鉛−シリカ質は熱伝導率が高いため、
ノズル周囲からの抜熱が大きく、上記ｌ）の機構により
生成したＡ Ｉ！２（ｈを伴った鋼の凝固、成長が進行
する。
この対策として、従来から実施されている方法としては
、例えば、
（１）「鉄と鋼ｊ、Ｖｏ１．７２ （１９８６） 、
ＩＶｈ４．３２７８ （奥付ら）記載のように、Ｓｉ０
ｇレス（１重量％以下）、低黒鉛量（８重量％）のアル
ミナ−黒鉛質の採用によって、Ａ ｌ 、Ｏ，析出を抑
制する方法。
（２）また、一部製晶化されている熱伝導率の低いＺｒ
０ｚ−ＣａＯ−Ｃ（ｏｒ ５ｉＣ）質の採用によって
ノズル周囲からの抜熱を抑制する方法。
などが知られている。
（発明が解決しようとする問題点）
しかし、上記（１）の方法では、熱伝導性の問題がら、
閉塞の抑制度合は小さい。また（２）の方法では、Ｚｒ
０２−ＣａＯ−Ｃ（ｏｒ ５ｉｎ）質では、５ｉ０２が
不純物として含有されると鋼中（０）により浸食されや
すいこと、また耐熱衝撃性に劣ることなどの問題があり
、満足すべきものではない。
本発明はかかる問題点を解決できる浸漬ノズルを提供せ
んとするものである。
（問題点を解決するための手段）
上記問題を解決するため、本発明者等が種々研究・実験
を行った結果、■熱伝導率の低いＺｒＯ□系耐火物にお
いて、耐食性、耐熱衝撃性に優れるＺｒＯ□−ＭｇＯを
主体とし、■さらに耐熱衝撃性向上のために含有する黒
鉛を低下させ、不純物として含まれるＳｉＯ□を極力少
なくすることによりＡ Ａ ２Ｏｆｆの析出を抑制する
ことを見出し、本発明を完成させたのである。
ここに本発明の要旨とするところは、鋼の連続鋳造用浸
漬ノズルの孔閉塞に関して、ＺｒＯ２−ＭｇＯを主体と
したノズル内壁材質の改良に関する。さらに詳しく説明
すると、図面に示すようにノズル本体の内周壁面に、Ｍ
ｇＯ：１〜１５重量％、Ｃ：２０重量％以下、ＳｉＯ□
：１重量％以下、残部が不可避不純物とＺｒＯ□からな
る部材２を配置したことを要旨とする浸漬ノズルである
。
本発明においてノズル本体の内周壁面に配置する部材の
成分を上記した如く限定するのは以下の理由による。
１）ＭｇＯ
１重量％未満では耐熱衝撃性が低下し、１５重量％を超
えても耐熱衝撃性が低下するので１〜１５重量％とじた
。
２）ＳｉＯｚ
１重量％を超えると（０）供給源としての活動が顕著と
なり、Ａｌ２Ｏ２の析出を促進するので１重量％以下と
した。
３）Ｃはバインダーの役目、耐食性向上、耐熱衝撃性向
上のために添加するが、２０重量％を超えると耐食性が
悪化するので２０重量％以下とした。
４）ＺｒＯｚは耐食性、耐熱衝撃性を向上する成分であ
り不可避的に含有する不純物を除き、上記各成分の残部
％とする。
（実 施 例）
次に、本発明の詳細な説明する。
内周壁面に下記表に示す組成の連続鋳造用ノズルを製作
し、これらの浸漬ノズルを用いて４０ｋｇ／ ｍｍ ”
級ＡＡ−３ｉキルド鋼を１７５０ ｔｏｎ（２５０ｔｏ
ｎを収容した取鍋で７連鋳）鋳込んだ後の状況と調べた
。その結果を同じく下記表に併記した。なお、併せて従
来例及び参考例も下記表に示す。
以上の表より明らかなように、本発明によれば、容易に
多連鋳化が図られ、しかも高連続鋳造化の際の吐出流の
偏流も抑制できることが判る。
（発明の効果）
以上説明したように本発明に係る浸漬ノズルは、アルミ
ナ黒鉛質を主成分としたノズル本体の内周壁面に、１）
ｇｏ：１〜１５重景％、Ｃ：２０重量％以下、Ｓｉｏ２
：１重量％以下、残部が不可避不純物とＺｒＯ□からな
る部材を配置した構成である為、Ａｌ含有率の高い鋼を
連続鋳造した場合でも孔閉塞が発生しない。加えて本発
明にＪれば高速続鋳造化の際の吐出流の偏流も抑制でき
、操業に、鋼の品質管理上火なる効果を有する。[0] is supplied, and the following reaction occurs: A/zO:+ (precipitation). Therefore, starting from A 1203 precipitated at the interface,
AI floating in steel! Attachment of 203 clusters develops, leading to pore blockage. 2) Alumina-graphite-silica has high thermal conductivity, so
A large amount of heat is removed from around the nozzle, and the A I! 2 (solidification and growth of steel proceed with
As stated in IVh4.3278 (colophon et al.), Si0
A method of suppressing Al, O, and precipitation by employing an alumina-graphite material that is g-less (1% by weight or less) and has a low graphite content (8% by weight). (2) Also, Zr, which has low thermal conductivity and is partially crystallized,
A method of suppressing heat removal from around the nozzle by adopting 0z-CaO-C (or 5iC) quality. etc. are known. (Problems to be solved by the invention) However, in the method (1) above, due to the problem of thermal conductivity,
The degree of suppression of occlusion is small. In addition, in method (2), Zr
The 02-CaO-C (or 5in) quality is unsatisfactory because if 5i02 is contained as an impurity, it is easily corroded by (0) in the steel and has poor thermal shock resistance. The present invention aims to provide a submerged nozzle that can solve these problems. (Means for Solving the Problems) In order to solve the above problems, the present inventors conducted various research and experiments, and found that: ■ ZrO□-based refractories with low thermal conductivity have improved corrosion resistance and thermal shock resistance. Based on the excellent ZrO□-MgO, we discovered that the precipitation of A A 2Off can be suppressed by reducing the graphite content to improve thermal shock resistance and minimizing the amount of SiO□ contained as an impurity. He completed his invention. The gist of the present invention is to improve the nozzle inner wall material, which is mainly composed of ZrO2-MgO, with regard to hole clogging in a submerged nozzle for continuous casting of steel. To explain in more detail, as shown in the drawing, M
gO: 1 to 15% by weight, C: 20% by weight or less, SiO□
: 1% by weight or less, and the remainder consists of unavoidable impurities and ZrO□. In the present invention, the components of the members disposed on the inner circumferential wall surface of the nozzle body are limited as described above for the following reasons. 1) If MgO is less than 1% by weight, the thermal shock resistance will decrease, and if it exceeds 15% by weight, the thermal shock resistance will also decrease, so the content was limited to 1 to 15% by weight. 2) SiOz If SiOz exceeds 1% by weight, its activity as a (0) supply source becomes significant and promotes the precipitation of Al2O2, so the content was set to 1% by weight or less. 3) C is added to serve as a binder, improve corrosion resistance, and improve thermal shock resistance, but if it exceeds 20% by weight, corrosion resistance deteriorates, so it is limited to 20% by weight or less. 4) ZrOz is a component that improves corrosion resistance and thermal shock resistance, and excluding impurities that are unavoidably contained, ZrOz is the remaining percentage of each of the above components. (Example) Next, the present invention will be explained in detail. Continuous casting nozzles with the composition shown in the table below were manufactured on the inner peripheral wall surface, and these immersion nozzles were used to cast 40 kg/mm.
1750 tons (250 tons) of grade AA-3i killed steel
The situation was investigated after seven continuous castings were carried out in a ladle containing n. The results are also listed in the table below. In addition, conventional examples and reference examples are also shown in the table below. As is clear from the above table, according to the present invention, multiple continuous casting can be easily achieved, and it is also possible to suppress uneven flow of the discharge flow during high continuous casting. (Effects of the Invention) As explained above, the immersion nozzle according to the present invention has 1)
go: 1 to 15 weight%, C: 20% by weight or less, Sio2
: 1% by weight or less, the balance being unavoidable impurities and ZrO□, so even when steel with a high Al content is continuously cast, pore clogging will not occur. In addition, according to the present invention, it is possible to suppress the drift of the discharge flow during high-speed continuous casting, which has a significant effect in terms of operation and quality control of steel.
図面は本発明方法の説明図である。 ｌはノズル本体、２は内周壁面部材。 The drawings are explanatory diagrams of the method of the present invention. 1 is the nozzle body, and 2 is the inner peripheral wall member.
Claims (1)
壁面に、ＭｇＯ：１〜１５重量％、Ｃ：２０重量％以下
、ＳｉＯ＿２：１重量％以下、残部が不可避不純物とＺ
ｒＯ＿２からなる部材を配置したことを特徴とする浸漬
ノズル。(1) The inner peripheral wall surface of the nozzle body, which is mainly composed of alumina graphite, contains MgO: 1 to 15% by weight, C: 20% by weight or less, SiO_2: 1% by weight or less, and the balance is unavoidable impurities and Z.
An immersion nozzle characterized in that a member made of rO_2 is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3519687A JPS63203258A (en) | 1987-02-17 | 1987-02-17 | Immersion nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3519687A JPS63203258A (en) | 1987-02-17 | 1987-02-17 | Immersion nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63203258A true JPS63203258A (en) | 1988-08-23 |
Family
ID=12435107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3519687A Pending JPS63203258A (en) | 1987-02-17 | 1987-02-17 | Immersion nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63203258A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0826447A1 (en) * | 1996-08-26 | 1998-03-04 | Shinagawa Refractories Co., Ltd. | Nozzle for continuous casting |
-
1987
- 1987-02-17 JP JP3519687A patent/JPS63203258A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0826447A1 (en) * | 1996-08-26 | 1998-03-04 | Shinagawa Refractories Co., Ltd. | Nozzle for continuous casting |
| US5908577A (en) * | 1996-08-26 | 1999-06-01 | Shinagawa Refractories Co., Ltd. | Nozzle for continuous casting |
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