JPH04187347A - Pouring device for sheet metal continuous caster - Google Patents
Pouring device for sheet metal continuous casterInfo
- Publication number
- JPH04187347A JPH04187347A JP2315913A JP31591390A JPH04187347A JP H04187347 A JPH04187347 A JP H04187347A JP 2315913 A JP2315913 A JP 2315913A JP 31591390 A JP31591390 A JP 31591390A JP H04187347 A JPH04187347 A JP H04187347A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- pouring
- inclined plate
- refractory
- pouring nozzle
- 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
- 239000002184 metal Substances 0.000 title description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 8
- 230000003628 erosive effect Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 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 abstract description 4
- 229910052593 corundum Inorganic materials 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 2
- 238000007569 slipcasting Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 2
- 238000005245 sintering Methods 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 229910052845 zircon Inorganic materials 0.000 description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、薄板連続鋳造機の注湯装置に関し、と（に
溶鋼から厚さ約１０ｍ以下の薄鋼板を直接鋳造する双ロ
ール式薄板連続鋳造機に用いられる注湯装置、なかでも
溶鋼を注湯ノズルと傾斜板とを介して、相対する冷却ロ
ール（水冷式鋳造ロール）間の湯溜り部に供給する形式
の注湯装置における該注湯ノズルの改良構造に関しての
提案である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pouring device for a continuous thin plate casting machine, and a twin roll type continuous thin plate casting machine that directly casts a thin steel plate with a thickness of about 10 m or less from molten steel. A pouring device used in a casting machine, especially a pouring device that supplies molten steel to a pool between opposing cooling rolls (water-cooled casting rolls) through a pouring nozzle and an inclined plate. This is a proposal regarding the improved structure of the hot water nozzle.
上記薄板連続鋳造機は、厚さ数ミリまでの熱延板相当材
を溶鋼から直接鋳造して製造する連鋳機であって、いわ
ゆる厚さ１００〜３００閣程度のスラブを直接鋳造する
スラブ連鋳機やＩＷ未満の２、冷薄帯を鋳造する薄帯鋳
造機に比べると、注湯装置に特別の工夫が必要である。The above continuous thin plate casting machine is a continuous casting machine that directly casts materials equivalent to hot rolled sheets up to several millimeters thick from molten steel, and is a continuous slab casting machine that directly casts slabs with a thickness of about 100 to 300 mm. Compared to a casting machine or a ribbon casting machine that casts cold ribbon, special measures are required for the pouring device.
例えば、スラブ連鋳機では．タンディッシュ内溶鋼は、
イマージジンノズルを介してモールド内に供給するだけ
で足りるので、通常、前記イマージョンノズルに対して
は特別の工夫は必要でない。しかし、本発明にかかる薄
板連鋳機では、第２図に示すように、湯溜り部が隣接す
る冷却ロール間の挟間に形成されるので、この湯溜り部
の場面が注湯によって変動すると、ロール面に接して生
成しようとする凝固シェルの性状に直ちに影響を及ぼす
ことになる。その結果、鋳造薄鋼板の表面性状を著しく
劣化させることになるのである。For example, in a continuous slab caster. The molten steel in the tundish is
Since it is sufficient to simply supply the material into the mold through the immersion nozzle, no special measures are usually required for the immersion nozzle. However, in the thin plate continuous casting machine according to the present invention, as shown in FIG. 2, the pool is formed between adjacent cooling rolls, so if the position of the pool changes due to pouring, This will immediately affect the properties of the solidified shell that will be produced in contact with the roll surface. As a result, the surface quality of the cast thin steel sheet is significantly deteriorated.
このため、従来、この種の連鋳機に用いられる注湯装置
には．タンディッシュ内溶鋼を、注湯ノズルを介して湯
溜り部に供給するとき、かがる注湯ノズル直下に傾斜板
を配置して、溶鋼落下流が湯溜り部の湯面を波立たせる
ことがないように工夫する一方、溶鋼流が均一な層流に
なるように、前記注湯ノズルの下部の吐出口を種々の複
雑な形に工夫していた。For this reason, conventionally, the pouring device used in this type of continuous casting machine has a. When the molten steel in the tundish is supplied to the molten metal pool via the pouring nozzle, an inclined plate is placed directly below the molten metal pouring nozzle so that the falling flow of molten steel ripples the surface of the molten metal in the molten metal pool. At the same time, the discharge opening at the bottom of the pouring nozzle was designed to have various complicated shapes so that the molten steel flow would be a uniform laminar flow.
そのために、従来の注湯装置については、前記注湯ノズ
ル下部の吐出口部が却って早期に変形しやすくなり、こ
のことが均一な広幅層流での溶鋼吐出流を形成すること
を困難にしていた。For this reason, in conventional pouring devices, the discharge opening at the bottom of the pouring nozzle tends to deform early, which makes it difficult to form a uniform wide laminar flow of molten steel. Ta.
それは、従来のほとんどの注湯ノズルがアルミナ系耐火
物の焼成物を使用していたからである。This is because most conventional pouring nozzles use fired alumina refractories.
このような背景の下で、従来、アモルファス急冷薄帯製
造の分野においてジルコニア（ＺｒＯｚ）を使用する試
みが特開平１−１５０４４９号公報で提案されている。Against this background, an attempt to use zirconia (ZrOz) in the field of manufacturing an amorphous quenched ribbon has been proposed in Japanese Patent Laid-Open No. 1-150449.
上述したように、従来の注湯ノズルは、射出溶鋼流を広
幅の均一な層流とするために、粒子が細かく、耐熱衝撃
性に優れ、かつ機械加工特性に優れた酸化物、例えば最
も一般的なのがＡｌ２Ｏ３系耐火物であり、Ａｔｚｏ３
： ３０〜５０−ｔ％、 Ｓｉｎｇ ： ２０〜４
〇−ｔ％およびＣ：２０〜４０ｗｔ％の成分組成のもの
が代表的である。As mentioned above, in order to make the injection molten steel flow into a wide and uniform laminar flow, conventional pouring nozzles use oxides with fine particles, excellent thermal shock resistance, and excellent machining properties, such as the most popular The most popular type of refractory is Al2O3 type refractory.
: 30-50-t%, Sing: 20-4
Typical compositions include 0-t% and C: 20 to 40 wt%.
しかし、このＡ１１ａ３系耐火物で作製したノズルは、
要求特性とくに耐溶損特性に十分に応じられるものでは
なかった。However, the nozzle made with this A11a3 series refractory,
The required properties, especially the corrosion resistance properties, could not be fully met.
また、上記特開平１−１５０４４９号公報に開示された
ノズルは、下部の吐出口部を窒化珪素・硼素セラミック
ス（Ｓｉ３Ｎａ・ＢＮ）とし、上部の溶湯保持部のみを
２０〜９５ｗｔ％（以下は単に「％」のみで表示する）
のジルコン、残部溶融シリカからなる複合セラミックと
したものであり、ノズル全体が掻めて高価であり、アモ
ルファス合金の如き少量の金属溶湯を処理するノズルと
しては好適であるとしても、本発明で対象としているよ
うな大量の溶鋼を取り扱う注湯ノズルとしては適用が困
難である。In addition, the nozzle disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1-150449 has a lower discharge port made of silicon nitride/boron ceramics (Si3Na/BN), and only an upper molten metal holding part of 20 to 95 wt% (hereinafter simply referred to as (Display only as “%”)
This is a composite ceramic consisting of zircon, the remainder being fused silica, and the entire nozzle is very expensive, and although it is suitable as a nozzle for processing a small amount of molten metal such as an amorphous alloy, it is not the object of the present invention. It is difficult to use this method as a pouring nozzle that handles large quantities of molten steel.
以上要するに本発明は、寿命が短いとか高価であるとか
いう従来ノズルが抱えている上述のような問題点を克服
し、少なくとも最も溶損しやすい個所が耐溶損性に優れ
るような構成の注湯ノズルを提案することを目的とする
ものである。In summary, the present invention overcomes the above-mentioned problems of conventional nozzles such as short lifespan and high cost, and provides a pouring nozzle that has a structure in which at least the parts most likely to be melted and damaged have excellent corrosion resistance. The purpose is to make suggestions.
上部の如き目的に対し、本発明者らは、注湯ノズルの最
も溶損の激しい個所のみを耐溶損性の高い材料とする一
方、その他の個所を汎用の耐火物材料にて作製てするこ
とで経済性を考慮したものを開発した。そして、注湯ノ
ズルの溶損の激しい個所に用いる耐溶損性に優れる材料
として、ジルコンと炭素との混合物に想到し、以下に詳
述するような望ましい注湯ノズルを開発した。For purposes such as the upper part, the present inventors made only the parts of the pouring nozzle that were most susceptible to corrosion damage from a material with high corrosion resistance, while the other parts were made from a general-purpose refractory material. We have developed a system that takes economic efficiency into account. Then, we came up with the idea of a mixture of zircon and carbon as a material with excellent erosion resistance to be used in areas of the pouring nozzle where erosion is severe, and developed a desirable pouring nozzle as detailed below.
すなわち、本発明は．タンディッシュ内溶鋼を、相対す
る冷却ロール間に形成される湯溜り部に、注湯ノズルと
その直下に配置される傾斜板とを介して供給する形式の
注湯装置において、前記注湯ノズルの吐出口を含む傾斜
板側の下部を、Ｚｒ（ｈ ： ５０〜８０ｗｔ％および
Ｃ： ２０〜５０ｗｔ％の組成にかかる耐火物にて構成
したことを特徴とする薄板連続鋳造機の注湯装置、に関
し、
このような構成の注湯ノズルとすることにより、溶鋼の
吐出口まわりの形状を長期に安定して保持し、かつヒー
トショックや熱膨張の悪影響を緩和できるようにしたの
である。That is, the present invention... In a pouring device that supplies molten steel in a tundish to a pool formed between opposing cooling rolls via a pouring nozzle and an inclined plate disposed directly below the pouring nozzle, A pouring device for a continuous thin plate casting machine, characterized in that the lower part of the inclined plate side including the discharge port is made of a refractory having a composition of Zr (h: 50 to 80 wt% and C: 20 to 50 wt%), With regard to this, by creating a pouring nozzle with such a configuration, the shape around the molten steel discharge port can be maintained stably for a long period of time, and the adverse effects of heat shock and thermal expansion can be alleviated.
本発明は、注湯ノズルの上部と、下部とくに溶鋼を射出
する吐出口付近との材質を変えることが特徴の１つであ
る。すなわち、上部の置部部分については、従来と同じ
ように安価なＡｌｔｏｓ系耐火物４ａにて形成し、後者
の吐出口を含む下部については耐溶損性に優れたジル、
コン系耐火物４ｂにて形成することとした。このように
下部のみをジルコン系耐火物を用いる理由は、この注湯
ノズルの吐出口まわりというのは、溶鋼を傾斜板上に射
出する部分であって、溶鋼流の方向が急激に変化すると
共に衝撃を受けやすい個所であるから、ノズルの溶損が
最も激しく、それ故に少なくともこの部分の材質は耐溶
損性に優れたものを使うことが必要であるからである。One of the features of the present invention is that the material of the upper part of the pouring nozzle and the lower part, particularly in the vicinity of the discharge port for injecting molten steel, are different. That is, the upper mounting part is made of inexpensive Altos refractory 4a, as in the past, and the lower part, including the latter discharge port, is made of gil, which has excellent erosion resistance.
It was decided to form it with the concrete type refractory material 4b. The reason why zircon-based refractories are used only in the lower part is that the area around the discharge port of the pouring nozzle is where the molten steel is injected onto the inclined plate, and the direction of the molten steel flow changes rapidly. This is because the nozzle is subject to the most severe erosion because it is a part that is easily subjected to impact, and therefore it is necessary to use a material with excellent erosion resistance at least for this part.
二のような要請に応えられるジルコン系耐火物として本
発明は、圧縮強度が３００ｋｇ／ｍｍ”以上のＺｒＯ□
：５０〜８０％で残部がＣである組成のものを採用する
。ＺｒＯ，が５０％未満では耐食性が悪く熱間強度が低
いので、所望の効果を達成できないし、このＺｒ０ｚが
８０％を超えると硬すぎて加工が困難になる他、スポー
リングを起こしやすくなる。また、本発明の耐火物は、
Ｃを２０〜５０％含有する。二〇〇をＺｒＯ，粉末中に
混合して用いる理由は、二〇〇の存在によって耐久ポー
リング性が向上するからであり、２０％より少ないと必
要な効果が得られないのに対し、５０％を超える多量の
添加は圧縮強度と耐溶損性の劣化が顕著になる臨界であ
る。The present invention uses ZrO□ with a compressive strength of 300 kg/mm" or more as a zircon-based refractory that can meet the above requirements.
: A composition having a composition of 50 to 80% and the balance being C is used. If the ZrOz content is less than 50%, the desired effect cannot be achieved because the corrosion resistance is poor and the hot strength is low, and if the ZrOz content exceeds 80%, it becomes too hard and difficult to process, and also tends to cause spalling. Moreover, the refractory of the present invention is
Contains 20-50% C. The reason why 200 is used by mixing it into ZrO powder is that the presence of 200 improves the durable polling property. Addition of a large amount exceeding 100% is a critical point at which deterioration of compressive strength and erosion resistance becomes noticeable.
本発明において、上部をＡｌ２Ｏ３系耐火物とし下部を
ＺｒＯ，系耐火物としたものを一体成形する方法として
は、上・下部で組成が異なるものの、ＣＩＰ、）ＩＩＰ
法を利用した粉末冶金技術の応用あるいはスリップ鋳造
したものを焼成することによって成形することができる
。In the present invention, as a method for integrally molding the upper part made of Al2O3-based refractory and the lower part made of ZrO-based refractory, CIP, ) IIP are used, although the upper and lower parts have different compositions.
It can be molded by applying powder metallurgy technology or by firing slip casting.
Ｃ実施例〕
第１図に示すような注湯ノズルを、第２図に示す双ロー
ル式薄板直接鋳造機の注湯装置に取付けて、ＳＵＳ ３
０４の溶ｆｉｌｌｏ ｌ−ンを、２ｍｌ厚−６００簡幅
の薄鋼板を連続鋳造する試験を行った。なお、図示の薄
板連続鋳造機は、傾斜配置に係る一対の冷却ロール１．
２間のロールキス部上に湯溜り部３を形成してなり、こ
の湯溜り部に、注湯ノズル４と傾斜板５との組合わせに
係る注湯装置を介して、タンデイツシュ６内溶ｍ’ｔを
供給できるように構成されたものである。使用した注湯
ノズルの組成を第１表に示す。Example C] A pouring nozzle as shown in Fig. 1 was attached to the pouring device of a twin-roll thin plate direct casting machine shown in Fig. 2, and SUS 3
A test was conducted in which a thin steel plate with a thickness of 2 ml and a width of 600 mm was continuously cast using a molten fillo line of No. 04. The illustrated thin plate continuous casting machine has a pair of cooling rolls 1.
A pool 3 is formed on the roll kiss part between the rolls 2 and 2, and the molten m' It is configured to be able to supply t. Table 1 shows the composition of the pouring nozzle used.
１０トンの溶鋼を注湯し終わったときの吐出口４Ｃの開
口面積は、使用前１５２０ｍｍ”だったものが、本発明
のノズルでは損傷がわずかで、拡開率１１０％であった
のに対し、従来ノズルでは損傷が激しく拡開率は１３０
％を超えた。しかも、本発明ノズルは上部と下部は組成
が異なるにもかかわらず、割れなどは全く見られなかっ
た。After pouring 10 tons of molten steel, the opening area of the discharge port 4C was 1520 mm before use, but with the nozzle of the present invention, there was only slight damage and the expansion ratio was 110%. , the conventional nozzle was severely damaged and the expansion rate was 130.
exceeded %. Moreover, in the nozzle of the present invention, no cracks were observed even though the upper and lower parts had different compositions.
以上説明したように、本発明注湯装置にあっては、注湯
ノズルの吐出口まわりのみをＺｒＯ□とＣとからなるジ
ルコン系耐火物にて形成することで、吐出口のまわりの
耐溶損性に優れるから、長期に亘って安定した射出溶鋼
流を傾斜板上に射出することができ、それ故に、表面性
状に優れた広幅の薄板を容易に直接鋳造することができ
る。また、本発明は、安価な注湯装置を提供できる。As explained above, in the pouring device of the present invention, by forming only the area around the discharge port of the pouring nozzle with a zircon-based refractory made of ZrO□ and C, the area around the discharge port is resistant to corrosion. Because of its excellent properties, a stable injection molten steel flow can be injected onto an inclined plate over a long period of time, and therefore, wide thin plates with excellent surface properties can be easily directly cast. Further, the present invention can provide an inexpensive pouring device.
第１図は、本発明に係る装置の注湯ノズルの断面図であ
り、
第２図は、薄板連続鋳造機の路線図である。FIG. 1 is a cross-sectional view of a pouring nozzle of an apparatus according to the present invention, and FIG. 2 is a route diagram of a continuous thin plate casting machine.
Claims (1)
形成される湯溜り部に、注湯ノズルとその直下に配置さ
れる傾斜板とを介して供給する形式の注湯装置において
、 前記注湯ノズルの吐出口を含む傾斜板側の下部を、Ｚｒ
Ｏ＿２：５０〜８０ｗｔ％およびＣ：２０〜５０ｗｔ％
の組成にかかる耐火物にて構成したことを特徴とする薄
板連続鋳造機の注湯装置。1. In a pouring device that supplies molten steel in a tundish to a pool formed between opposing cooling rolls via a pouring nozzle and an inclined plate disposed directly below the pouring nozzle, The lower part of the inclined plate side including the discharge port is made of Zr.
O_2: 50-80wt% and C: 20-50wt%
A pouring device for a continuous thin plate casting machine, characterized in that it is constructed of a refractory having the composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2315913A JPH04187347A (en) | 1990-11-22 | 1990-11-22 | Pouring device for sheet metal continuous caster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2315913A JPH04187347A (en) | 1990-11-22 | 1990-11-22 | Pouring device for sheet metal continuous caster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04187347A true JPH04187347A (en) | 1992-07-06 |
Family
ID=18071117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2315913A Pending JPH04187347A (en) | 1990-11-22 | 1990-11-22 | Pouring device for sheet metal continuous caster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04187347A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005123301A1 (en) * | 2004-06-16 | 2005-12-29 | Nucor Corporation | Zirconia refractories for making steel |
-
1990
- 1990-11-22 JP JP2315913A patent/JPH04187347A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005123301A1 (en) * | 2004-06-16 | 2005-12-29 | Nucor Corporation | Zirconia refractories for making steel |
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