JPH05228587A - Twin belt type continuous casting method - Google Patents
Twin belt type continuous casting methodInfo
- Publication number
- JPH05228587A JPH05228587A JP3664192A JP3664192A JPH05228587A JP H05228587 A JPH05228587 A JP H05228587A JP 3664192 A JP3664192 A JP 3664192A JP 3664192 A JP3664192 A JP 3664192A JP H05228587 A JPH05228587 A JP H05228587A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- molten metal
- twin
- casting nozzle
- continuous casting
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、通常、厚み１００〜３
０mm、幅５００〜２５００mmの薄肉鋳板を製造する双ベ
ルト式連続鋳造方法に関するものである。BACKGROUND OF THE INVENTION The present invention generally has a thickness of 100 to 3
The present invention relates to a twin belt type continuous casting method for producing a thin cast plate having a width of 0 mm and a width of 500 to 2500 mm.
【０００２】[0002]
【従来の技術】双ベルト式連続鋳造方法は、一般に流路
断面が長方形の鋳造ノズルから溶融金属を双ベルト式モ
ールドに注入してモールド内溶融金属レベルが所定レベ
ルに到達後これを維持しながら双ベルト式モールドを高
速駆動せしめて薄い鋳板を連続鋳造するものであるが、
この開始にあたって前記鋳造ノズルは予め鋳造溶融金属
の溶融温度近くの７００℃前後に加熱して後タンディッ
シュに取付け溶融金属を双ベルト式モールドに注入開始
するものであった。2. Description of the Related Art In the twin belt type continuous casting method, molten metal is generally injected into a twin belt type mold from a casting nozzle having a rectangular flow path section, and the molten metal level in the mold is maintained after reaching a predetermined level. The twin belt type mold is driven at high speed to continuously cast thin cast plates.
To start this, the casting nozzle was previously heated to around 700 ° C., which is close to the melting temperature of the molten metal for casting, and then attached to a tundish to inject molten metal into a twin-belt mold.
【０００３】[0003]
【発明が解決しようとする課題】ところが、該鋳造ノズ
ルから双ベルト式モールドへの溶融金属注入を開始する
と、溶融金属から該鋳造ノズルを介しての抜熱、あるい
は溶融金属表面からの放射等により鋳造ノズル先端表面
に地金が付着する。鋳造ノズルのモールド内メニスカス
相当部に地金が付着するとこの付着した地金は、鋳造ノ
ズル先端部が溶融金属に浸漬後加速的に成長して、メニ
スカスを皮張り状にしベルト側の凝固シェルと結合する
異常状態が発生する。However, when molten metal injection from the casting nozzle into the twin-belt mold is started, heat is removed from the molten metal through the casting nozzle, or radiation from the surface of the molten metal occurs. The metal adheres to the tip surface of the casting nozzle. When the metal is attached to the meniscus equivalent part in the mold of the casting nozzle, this attached metal grows rapidly after the tip of the casting nozzle is immersed in the molten metal, and the meniscus is skinned to form a solidified shell on the belt side. An abnormal condition occurs that combines them.
【０００４】本発明者らの種々の実験検討の結果、該地
金の加速的な成長の要因としては、鋳造ノズル耐火物を
介しての溶融金属からの抜熱が大きいこと、パウダーレ
ス鋳造のためメニスカスでの熱放散が大きいこと、且つ
鋳造ノズル先端部表面と双ベルト表面間が狭隘なため溶
融金属流速が低速化することなどが主であることを解明
した。又、その他高速鋳造化に伴う湯面変動も助長要因
であることもわかった。As a result of various experiments conducted by the inventors of the present invention, the factors for the accelerated growth of the metal are the large heat removal from the molten metal through the refractory of the casting nozzle, and the powderless casting. Therefore, it was clarified that the heat dissipation at the meniscus was large and that the flow velocity of the molten metal was slowed down due to the narrow space between the tip of the casting nozzle and the surface of the twin belts. In addition, it was also found that the fluctuation of the molten metal surface due to high speed casting is also a contributing factor.
【０００５】この皮張りが発生している状態を図２
（ａ）に示すが、一旦この皮張りが発生すると鋳造ノズ
ル１が地金２と凝固シェル３を介して双ベルト４で下方
に引っ張られ、鋳造ノズル１が折れたり、双ベルト４が
大きく変形するなどの鋳造トラブルを起こす。又、図２
（ｂ）示す如く地金２と凝固シェル３の接合部が多段的
に変移して逆三角状に拡大していく三角状欠陥５とこの
三角状欠陥５の下端頂部６から下方に延在する縦割れ疵
７が発生するなど鋳造鋳片の品質を著しく劣化させるも
のであった。FIG. 2 shows a state in which this skinning occurs.
As shown in (a), once this skinning occurs, the casting nozzle 1 is pulled downward by the twin belt 4 via the base metal 2 and the solidification shell 3, and the casting nozzle 1 is broken or the twin belt 4 is largely deformed. It causes casting troubles such as doing. Moreover, FIG.
As shown in (b), the joint between the base metal 2 and the solidified shell 3 is shifted in multiple stages and expands in an inverted triangular shape. The triangular defect 5 extends downward from the lower end apex 6 of the triangular defect 5. The quality of the cast slab was remarkably deteriorated such as the occurrence of vertical cracks 7.
【０００６】本発明は、鋳造ノズルへの地金付着を抑止
し前記メニスカスでの皮張りを防止して以て鋳造ノズル
の折損、双ベルトの変形損傷などの鋳造トラブルを皆無
にするための手段を提供するものである。The present invention is a means for preventing the adhesion of metal to the casting nozzle and preventing the skinning at the meniscus to eliminate the casting trouble such as the breaking of the casting nozzle and the deformation damage of the twin belts. Is provided.
【０００７】[0007]
【課題を解決しようとする手段】本発明の特徴とする手
段は次の２つが主体となる。 （特徴１）双ベルト式連続鋳造において、鋳造ノズルを
予め溶融金属の融点未満から融点−５００℃の範囲内に
加熱すると同時に、溶融金属を双ベルト式モールドに注
入開始した後も継続して前記鋳造ノズルの溶融金属浸漬
部を加熱手段により加熱して同溶融金属浸漬部の温度を
鋳造溶融金属の溶融温度に昇温し保持することを特徴と
する双ベルト式連続鋳造方法。 （特徴２）双ベルト式連続鋳造において、前記鋳造ノズ
ルを予め溶融金属の融点以上に加熱すると同時に、溶融
金属を双ベルト式モールドに注入開始した後も継続して
前記鋳造ノズルの溶融金属浸漬部を加熱手段により加熱
して同溶融金属浸漬部の温度を溶融金属の溶融温度に保
持することを特徴とする双ベルト式連続鋳造方法。[Means for Solving the Problems] The following two are the main features of the present invention. (Characteristic 1) In twin-belt continuous casting, the casting nozzle is preheated to a temperature within the range of from less than the melting point of the molten metal to the melting point of −500 ° C., and at the same time, the molten metal is continuously injected into the twin-belt type mold. A twin-belt continuous casting method, characterized in that the molten metal dipping portion of the casting nozzle is heated by a heating means to raise and maintain the temperature of the molten metal dipping portion to the melting temperature of the casting molten metal. (Feature 2) In twin-belt continuous casting, the casting nozzle is heated in advance to a temperature equal to or higher than the melting point of the molten metal, and at the same time, after the molten metal is started to be poured into the twin-belt mold, it is continuously immersed in the molten metal of the casting nozzle. Is heated by a heating means to maintain the temperature of the molten metal immersion portion at the melting temperature of the molten metal, the twin belt type continuous casting method.
【０００８】[0008]
【作用】本発明の特徴１の手段は、鋳造ノズルを鋳造溶
融金属の溶融温度未満から溶融温度−５００℃の範囲内
に加熱しておき且つ溶融金属を双ベルト式モールドに注
入開始した後も継続して前記鋳造ノズルの溶融金属浸漬
部を加熱手段により加熱開始することにより、鋳造ノズ
ルの先端部が溶融金属に浸漬されると溶融金属の凝固を
抑止しながら鋳造ノズルの内部を流れる高温の溶融金属
からの吸熱昇温効果とあいまって鋳造ノズル先端部温度
を溶融金属の溶融温度に迅速に昇温させることができ
る。The means of feature 1 of the present invention is that the casting nozzle is heated within the range of the melting temperature of the casting molten metal to below the melting temperature of -500 ° C. and after the molten metal is started to be poured into the twin belt type mold. By continuously starting the molten metal immersion portion of the casting nozzle by the heating means, when the tip of the casting nozzle is immersed in the molten metal, high temperature flowing inside the casting nozzle while suppressing solidification of the molten metal Combined with the endothermic temperature raising effect from the molten metal, the temperature of the tip of the casting nozzle can be quickly raised to the melting temperature of the molten metal.
【０００９】これによって鋳造ノズル先端部の近くの溶
融金属を凝固させることなく付着した地金を瞬時に溶解
して前記したメニスカスでの皮張りを確実に防止するの
である。前記した鋳造ノズルの加熱温度を溶融温度−５
００℃より低くすると鋳造ノズル先端部と接触する溶融
金属からの抜熱量が加熱手段による加熱昇温速度よりも
大きくなるため、鋳造ノズル先端部に付着した地金の溶
解除去が出来なくなり前記したメニスカスでの皮張りが
発生し易くなる。With this, the solid metal adhered is instantly melted without solidifying the molten metal near the tip of the casting nozzle, and the skinning at the meniscus is surely prevented. The heating temperature of the casting nozzle described above is set to the melting temperature −5.
If the temperature is lower than 00 ° C, the amount of heat removed from the molten metal that comes into contact with the tip of the casting nozzle becomes larger than the rate of temperature rise by heating by the heating means, and the metal adhered to the tip of the casting nozzle cannot be dissolved and removed. It is easy to cause skinning.
【００１０】又、本発明の特徴２の手段は、鋳造ノズル
を予め鋳造溶融金属の溶融温度に加熱して後溶融金属を
双ベルト式モールドに注入開始することにより溶融金属
の冷却による鋳造ノズルへの地金付着を防止する。そし
て、該注入開始後も継続して前記鋳造ノズルの溶融金属
浸漬部を加熱して同溶融金属浸漬部の温度を溶融金属の
溶融温度に保持することにより、鋳造開始直後から、完
全に鋳造ノズル先端部に接触する溶融金属の凝固付着を
防止するものである。Further, the means of feature 2 of the present invention is that the casting nozzle is heated to the melting temperature of the casting molten metal in advance and then the molten metal is started to be injected into the twin-belt mold to cool the molten metal to the casting nozzle. To prevent the adhesion of metal. Then, even after the injection is started, the molten metal immersion portion of the casting nozzle is continuously heated to maintain the temperature of the molten metal immersion portion at the melting temperature of the molten metal, so that the casting nozzle is completely melted immediately after the start of casting. It prevents the solidification and adhesion of the molten metal that contacts the tip.
【００１１】[0011]
【実施例】次に、本発明の実施例を表１により比較例と
共に説明する。 鋳造条件 鋳造機：双ベルト式連続鋳造機 鋳造鋳片サイズ：幅１４００mm×厚み５０mm 鋳造速度：１０mpm 鋼種：Ｃ０〜０．５wt％の一般炭素鋼 溶鋼温度：１５６０℃、ΔＴ：４０℃ 溶鋼融点：１５２０℃ 鋳造ノズル材質：アルミナグラファイト質 鋳造ノズル注出口サイズ：１０×３８０mm 鋳造ノズル注出口外回りサイズ：３０×４００mmEXAMPLES Examples of the present invention will now be described with reference to Table 1 together with comparative examples. Casting conditions Casting machine: Twin belt type continuous casting machine Casting slab size: Width 1400 mm x thickness 50 mm Casting speed: 10 mpm Steel type: C0-0.5 wt% general carbon steel Molten steel temperature: 1560 ° C, ΔT: 40 ° C Melting steel melting point: 1520 ℃ Casting nozzle material: Alumina graphite casting nozzle spout size: 10 x 380mm Casting nozzle spout size: 30 x 400mm
【００１２】[0012]
【表１】 [Table 1]
【００１３】上記具体例２〜７における鋳造ノズル浸漬
部加熱構造は、図１に示す。図１の鋳造ノズル浸漬部加
熱構造は、加熱を通電により実施するための一例であっ
て、タングステンの細線８（直径１mm）を、鋳造ノズル
１の浸漬部に波状に張りつけた構造となっており、鋳造
時に溶鋼とタングステン線８が直接接触することを防止
する目的で、タングステン線８の上にアルミナ耐火物の
シートを被せた構造となっている。FIG. 1 shows the structure for heating the casting nozzle soaked portion in the above concrete examples 2 to 7. The casting nozzle immersion part heating structure of FIG. 1 is an example for carrying out heating by energization, and has a structure in which a thin tungsten wire 8 (diameter 1 mm) is attached to the immersion part of the casting nozzle 1 in a wave shape. In order to prevent the molten steel from directly contacting the tungsten wire 8 during casting, the tungsten wire 8 is covered with a sheet of alumina refractory material.
【００１４】表１中に示したように、従来法による鋳造
においてはメニスカス溶鋼が鋳造ノズルに凝固付着し、
三角状欠陥およびノズル折損等の品質、鋳造異常が発生
した。一方本発明法の手段１を用いて鋳造を実施した場
合は、初期に若干のメニスカス溶鋼の凝固付着が観察さ
れたものの、鋳造定常時においては地金の発生は全く観
察されなかった。更に本発明の手段２においては定常鋳
造時のみならず、鋳造初期においても地金生成は全く観
察されなかった。As shown in Table 1, in casting by the conventional method, the molten meniscus steel solidifies and adheres to the casting nozzle,
Quality such as triangular defects and broken nozzles, and casting abnormalities occurred. On the other hand, when casting was carried out using the means 1 of the method of the present invention, some solidification adhesion of molten meniscus steel was observed in the initial stage, but no generation of metal was observed during steady casting. Further, in the means 2 of the present invention, no metal formation was observed not only during steady casting but also at the beginning of casting.
【００１５】以上の様な条件で鋳造された鋳片の三角欠
陥発生を図３に示すが、従来法で鋳造した鋳片では、鋳
片１ｍ当たりに１０個以上の三角欠陥が発生したのに対
し、本発明法の手段１を用いた場合は、鋳造開始後８分
までは三角欠陥が発生するが、定常鋳造に達する８分以
降は、三角欠陥が全く認められない健全な鋳片が得られ
た。更に本発明法の手段２によって鋳造した鋳片は、鋳
造開始時より全く三角欠陥が無い、無欠陥の鋳片が得ら
れた。FIG. 3 shows the occurrence of triangular defects in a slab cast under the above-mentioned conditions. In the slab cast by the conventional method, 10 or more triangular defects were produced per 1 m of the slab. On the other hand, when the means 1 of the method of the present invention is used, triangular defects are generated up to 8 minutes after the start of casting, but after 8 minutes from the time when steady casting is reached, a sound cast piece having no triangular defects is obtained. Was given. Further, the cast piece cast by the method 2 of the method of the present invention was a flawless cast piece having no triangular defects from the start of casting.
【００１６】[0016]
【発明の効果】以上の説明で明らかなように本発明は、
前記各手段によって鋳造ノズルへの地金付着を抑止する
と共に、鋳造ノズル先端部の近くの溶融金属を凝固させ
ることなくメニスカスでの皮張りを確実に防止し、三角
欠陥等のない健全な品質の鋳片の製造を可能とするもの
である。又これにより鋳造ノズルの折損、双ベルトの変
形損傷などの鋳造トラブルを皆無にすることも併せて可
能となる。As is apparent from the above description, the present invention is
While suppressing the metal adhesion to the casting nozzle by each of the above means, it surely prevents skinning at the meniscus without solidifying the molten metal near the tip of the casting nozzle, and ensures a sound quality without triangular defects. It enables the production of cast slabs. This also makes it possible to eliminate casting troubles such as breakage of the casting nozzle and deformation damage of the twin belts.
【図１】鋳造ノズル浸漬部加熱構造の例を示す断面説明
図である。FIG. 1 is a cross-sectional explanatory view showing an example of a casting nozzle immersion part heating structure.
【図２】（ａ）（ｂ）は従来の双ベルト式連続鋳造にお
けるモールド内のメニスカスの皮張り状況を示す説明図
である。2 (a) and 2 (b) are explanatory views showing a skinning condition of a meniscus in a mold in conventional twin belt type continuous casting.
【図３】鋳造鋳片の疵発生状況を示す説明図である。FIG. 3 is an explanatory diagram showing a flaw generation state of a cast slab.
１ 鋳造ノズル ２ 地金 ３ 凝固シェル ４ 双ベルト ５ 三角状欠陥 ６ 三角状欠陥の下端頂部 ７ 縦割れ疵 ８ タングステン線 DESCRIPTION OF SYMBOLS 1 Casting nozzle 2 Bullion 3 Solidification shell 4 Twin belt 5 Triangular defect 6 Lower end apex of triangular defect 7 Vertical crack 8 Tungsten wire
───────────────────────────────────────────────────── フロントページの続き (72)発明者 縫部 綴 大分県大分市大字西ノ洲１番地 新日本製 鐵株式会社大分製鐵所内 (72)発明者 金井 則之 大分県大分市大字西ノ洲１番地 新日本製 鐵株式会社大分製鐵所内 (72)発明者 三吉野 育人 大分県大分市大字西ノ洲１番地 新日本製 鐵株式会社大分製鐵所内 (72)発明者 三隅 秀幸 大分県大分市大字西ノ洲１番地 新日本製 鐵株式会社大分製鐵所内 (72)発明者 笠間 昭夫 大分県大分市大字西ノ洲１番地 新日本製 鐵株式会社大分製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Suzou Tsuzushi, Oita City, Oita City, 1st Nishinosu, Nippon Steel Co., Ltd., Oita Steel Works, Ltd. Oita Steel Co., Ltd. (72) Inventor Miyoshino Ikuhito 1-chome Nishinosu, Oita City, Oita Prefecture Shin-Nippon Steel Co., Ltd. Oita Steel Co., Ltd. (72) Hideyuki Misumi 1- Nishinosu, Oita City, Oita Prefecture Nippon Steel Co., Ltd. Oita Steel Works (72) Inventor Akio Kasama 1 Nishinosu, Oita-shi, Oita Prefecture Nishinosu Nippon Steel Co., Ltd. Oita Steel Works
Claims (2)
ルを予め溶融金属の融点未満から融点−５００℃の範囲
内に加熱すると同時に、溶融金属を双ベルト式モールド
に注入開始した後も継続して前記鋳造ノズルの溶融金属
浸漬部を加熱手段により加熱して同溶融金属浸漬部の温
度を鋳造溶融金属の溶融温度に昇温し保持することを特
徴とする双ベルト式連続鋳造方法。1. In twin-belt continuous casting, the casting nozzle is preheated to a temperature within the range of less than the melting point of the molten metal to −500 ° C., and at the same time, the molten metal is continuously poured into the twin-belt type mold. A twin-belt continuous casting method, characterized in that the molten metal immersion portion of the casting nozzle is heated by a heating means to raise and maintain the temperature of the molten metal immersion portion to the melting temperature of the casting molten metal.
ノズルを予め溶融金属の融点以上に加熱すると同時に、
溶融金属を双ベルト式モールドに注入開始した後も継続
して前記鋳造ノズルの溶融金属浸漬部を加熱手段により
加熱して同溶融金属浸漬部の温度を溶融金属の溶融温度
に保持することを特徴とする双ベルト式連続鋳造方法。2. In twin-belt continuous casting, the casting nozzle is preheated to a melting point of molten metal or higher, and at the same time,
After the molten metal is started to be poured into the twin-belt mold, the molten metal immersion portion of the casting nozzle is continuously heated by the heating means to maintain the temperature of the molten metal immersion portion at the melting temperature of the molten metal. Twin belt type continuous casting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3664192A JPH05228587A (en) | 1992-02-24 | 1992-02-24 | Twin belt type continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3664192A JPH05228587A (en) | 1992-02-24 | 1992-02-24 | Twin belt type continuous casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05228587A true JPH05228587A (en) | 1993-09-07 |
Family
ID=12475477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3664192A Withdrawn JPH05228587A (en) | 1992-02-24 | 1992-02-24 | Twin belt type continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05228587A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421118A (en) * | 2020-04-27 | 2020-07-17 | 贵州莹月帆铝制品有限公司 | Aluminum alloy casting and rolling machine double-nozzle structure convenient for grain control |
-
1992
- 1992-02-24 JP JP3664192A patent/JPH05228587A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421118A (en) * | 2020-04-27 | 2020-07-17 | 贵州莹月帆铝制品有限公司 | Aluminum alloy casting and rolling machine double-nozzle structure convenient for grain control |
| CN111421118B (en) * | 2020-04-27 | 2023-07-21 | 贵州莹月帆铝制品有限公司 | Aluminum alloy casting and rolling machine double-casting-nozzle structure convenient for grain control |
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