JPH03184659A - Tundish for preventing oxidation in continuous casting and method for operating thereof - Google Patents

Tundish for preventing oxidation in continuous casting and method for operating thereof

Info

Publication number
JPH03184659A
JPH03184659A JP32121389A JP32121389A JPH03184659A JP H03184659 A JPH03184659 A JP H03184659A JP 32121389 A JP32121389 A JP 32121389A JP 32121389 A JP32121389 A JP 32121389A JP H03184659 A JPH03184659 A JP H03184659A
Authority
JP
Japan
Prior art keywords
molten steel
slag
ladle
tundish
communicating holes
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
Application number
JP32121389A
Other languages
Japanese (ja)
Inventor
Hisashi Osanai
小山内 寿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP32121389A priority Critical patent/JPH03184659A/en
Publication of JPH03184659A publication Critical patent/JPH03184659A/en
Pending legal-status Critical Current

Links

Landscapes

  • Continuous Casting (AREA)

Abstract

PURPOSE:To prevent oxidation of molten steel caused by passing the remaining slag layer by providing weirs partitioning a molten steel receiving part from a ladle and molten steel pouring parts into molds and molten steel communicating holes at lower parts of the weirs and arranging slag communicating holes above the molten steel communicating holes. CONSTITUTION:The molten steel 12 is poured into the molten steel receiving part 16 in the weirs 4 through a short nozzle 14. The molten steel 12 is passed through the molten steel communicating holes 6 at lower part and stored into the molten steel pouring parts 18 for A strand and B strand and poured into the molds 24A, 24B through each nozzle. If the molten steel is continuously poured into the molds 24, the molten steel in the molten steel receiving part 16 and the molten steel pouring parts 18 are lowered to the same level, because there are communicated through the molten steel communicating holes 6 and the slag communicating holes 10. Further, by lowering the molten steel level, the slag 8 is caused to flow out into the molten steel pouring part 18 through the slag communicating holes 10. By this method, as the slag layer in the weirs becomes extremely thick, even if the molten metal in the second and third ladles is received this is not oxidized, and the cast slab having the target components is easily produce, and multiple sequential continuous castings can be executed.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は連鋳用酸化防止タンディツシュおよびその操業
方法に係り、特に取鍋からの溶鋼受入れにはロングノズ
ルを使用せず、ショートノズルによる多連続鋳造に適す
る連鋳用酸化防止タンディツシュおよびその操業方法に
関し、Ti含有鋼等の如き酸化され易い元素を含む鋼の
連続鋳造分野で利用される。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an oxidation-preventing tundish for continuous casting and a method of operating the same, and in particular, it does not use a long nozzle to receive molten steel from a ladle, but instead uses a short nozzle to receive molten steel. The present invention relates to an oxidation-preventing tundish for continuous casting suitable for continuous casting and a method for operating the same, and is used in the field of continuous casting of steels containing easily oxidized elements such as Ti-containing steels.

〔従来の技術〕[Conventional technology]

連続鋳造用タンディツシュは、実開昭57−56546
、実開昭59−25353に見られる如く、取鍋からの
溶鋼受入部と鋳型への溶鋼注入部とを堰で仕切り、堰の
下部に溶鋼連通孔を設けることによって取鍋からの溶鋼
受入れの末期に混入するスラグを貯溜し、併せて鋳型へ
の溶鋼注入部ヘスラグが混入しないようにして操業して
いる。
The tundish for continuous casting is manufactured by Utility Model No. 57-56546.
As seen in Utility Model Application No. 59-25353, the molten steel receiving section from the ladle and the molten steel injection section into the mold are separated by a weir, and a molten steel communication hole is provided at the bottom of the weir, thereby making it possible to receive the molten steel from the ladle. The slag that gets mixed in at the end of the process is stored, and the operation is done to prevent slag from getting into the part where molten steel is injected into the mold.

取鍋からタンディツシュに流出するスラグ量を低減する
ためには、取鍋に残す溶鋼をやや多い目にして注入を停
止することによって防止できるが取鍋中の残鋼が多いと
経済的損失が大となるので注入操作上は残鋼量ができる
だけ少く、がっスラグ流出量も少く抑えることが望まし
いが、実際操業上は取鍋からタンディツシュ側へのスラ
グの流出はある程度まで避けることができない。
In order to reduce the amount of slag flowing from the ladle into the tundish, it can be prevented by stopping the injection when a little more molten steel remains in the ladle, but if there is too much remaining molten steel in the ladle, there will be a large economic loss. Therefore, in pouring operations, it is desirable to keep the amount of residual steel as small as possible and the amount of slag flowing out. However, in actual operation, the flow of slag from the ladle to the tundish side cannot be avoided to some extent.

取鍋からタンディツシュへのスラグ流出を避けるために
、通常ロングノズルを使用し、タンディツシュの溶鋼中
にその下端を浸漬して取鍋表面のスラグを巻込まないよ
うに注入することが、一般に行われているが、ロングノ
ズルはショートノズルに比しコストが高く、かつ取鍋操
作上、ロングノズルをタンディツシュに挿入する際に取
鍋側の上昇、下降操作が迅速を欠き扱いにくい欠点があ
る。
In order to avoid slag flowing from the ladle into the tundish, it is common practice to use a long nozzle and immerse its lower end in the molten steel of the tundish to avoid entraining the slag on the surface of the ladle. However, long nozzles are more expensive than short nozzles, and when inserting a long nozzle into a tundish, the ladle side cannot be raised or lowered quickly, making it difficult to handle.

従って、タンディツシュに堰を設置する目的から考慮す
ると、堰によって溶鋼、スラグの分離が可能であるので
、堰機能を十分に発揮できれば、ショートノズルを利用
しても鋼の品質保持上はなんら問題がなく、コスト上も
はるかに有利である。
Therefore, considering the purpose of installing a weir in Tanditshu, the weir can separate molten steel and slag, so if the weir function can be fully demonstrated, there will be no problem in maintaining the quality of the steel even if a short nozzle is used. It is much more advantageous in terms of cost.

本発明は、ショートノズルを利用する、いわゆるオープ
ン注入方式と堰とを組合わせて効果的な連続鋳造を行い
得るタンディツシュおよびその操業方法に関する。
The present invention relates to a tundish that can perform effective continuous casting by combining a so-called open injection method using a short nozzle and a weir, and a method for operating the same.

かくの如く、オープン方式をとっても、タンディツシュ
の層内で非金属介在物の浮上分離およびスラグ分離を図
ることは、堰の下部に連通孔を設けることによりタンデ
ィツシュ内の溶鋼、流動を乱さず可能であるが、溶鋼の
連通孔のみを有する従来のタンディツシュでは次の如き
大きな問題がある。
As described above, even with the open method, it is possible to float and separate non-metallic inclusions and slag within the tundish layer without disturbing the flow of molten steel in the tundish by providing a communicating hole at the bottom of the weir. However, conventional tundishes having only communication holes for molten steel have the following major problems.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記の如き溶鋼の連通孔のみを有するタンディツシュに
て操業する場合、タンディツシュの溶鋼受入部には已む
を得ず流入したスラグが溶鋼上にスラグ層を形成して浮
遊しているので、連々鋳の如く第2.第3の取鍋から、
タンディツシュの溶鋼受入部に注入される溶鋼は、タン
ディツシュのスラグ層を通過するために、溶鋼中の成分
でもしTiの如き酸化され易い元素が含有される場合、
スラグ中に存在するFeO等の酸化物によってTi等の
酸化され易い元素が酸化され、いわゆるTiドロップと
なって第2、第3取鍋からの溶鋼中のTi等の酸化され
易い元素が酸化され、第2、第3取鍋からの連々鋳鋳片
のTi量が低下し目標含有量を外れる結果となる。例え
ばTi含有鋼等の場合は、第2、第3取鍋からの溶鋼受
入時にTiの燃焼が目視的にもwA察される。
When operating in a tundish having only communication holes for molten steel as described above, the slag that inevitably flows into the molten steel receiving part of the tundish forms a slag layer on the molten steel and floats thereon. Like the second. From the third ladle,
The molten steel injected into the molten steel receiving part of the tundish passes through the slag layer of the tundish, so if the molten steel contains elements that are easily oxidized such as Ti,
Easily oxidized elements such as Ti are oxidized by oxides such as FeO present in the slag, resulting in so-called Ti drops, which oxidize easily oxidized elements such as Ti in the molten steel from the second and third ladles. , the Ti content of the cast slabs from the second and third ladles decreases and deviates from the target content. For example, in the case of Ti-containing steel, combustion of Ti can be visually observed wA when molten steel is received from the second and third ladles.

本発明の目的は、Tiの如き酸化されやすい元素を含有
するm#Rの連続鋳造、特に連々鋳ないし多連鋳を実施
しても、酸化を防止し得る効果的な構成を有する連鋳用
酸化防止タンディツシュおよびそのタンディツシュによ
る効果的な操業方法を提供しようとするものである。
The object of the present invention is to continuously cast m#R containing elements that are easily oxidized such as Ti, and in particular, to provide continuous casting that has an effective structure that can prevent oxidation even when continuous casting or multiple continuous casting is carried out. The present invention aims to provide an antioxidant tundish and an effective method of operating the tundish.

〔問題点を解決するための手段〕[Means for solving problems]

本発明によるタンディツシュの要旨とするところは次の
如くである。
The gist of the tandish according to the present invention is as follows.

すなわち、取鍋からの溶鋼受入部と、鋳型への溶鋼注入
部と、角記溶鋼受入部と注入部とを仕切る堰と、前記堰
の下部に設けられた溶鋼連通孔とを有して成る連鋳用タ
ンディツシュにおいて、前記溶鋼連通孔の上部に前記溶
鋼受入部のスラグを前記溶鋼注入部へ流出するスラグ連
通孔を有することを特徴とする連鋳用酸化防止タンディ
ツシュである。
That is, it has a molten steel receiving part from the ladle, a molten steel injection part into the mold, a weir that partitions the molten steel receiving part and the injection part, and a molten steel communication hole provided at the bottom of the weir. The tundish for continuous casting is characterized in that it has a slag communication hole above the molten steel communication hole through which slag in the molten steel receiving section flows out to the molten steel injection section.

次に本発明によるタンディツシュによる操業方法の要旨
とするところは、次の如くである。
Next, the gist of the operating method using a tanditsh according to the present invention is as follows.

すなわち、ダンデイツシュの溶鋼受入部にて第1取鍋の
溶鋼を受入れる段階と、前記溶鋼受入部内に残留するス
ラグ全量を前記スラグ連通孔を介して溶鋼注入部へ流出
させる段階と、前記溶鋼受入部に第2取鍋の溶鋼を受入
れる段階と、前記溶鋼受入部に残留するスラグ全量を前
記スラグ連通孔を介して溶鋼注入部へ流出させる段階と
、を繰返し、この間前記溶鋼注入部の溶鋼を連続的に鋳
型へ注入して多連続鋳造を行うことを特徴とする請求項
(1)に記載の連鋳用酸化防止タンデイツシユの操業方
法である。
That is, a step of receiving the molten steel in the first ladle at the molten steel receiving section of the dandytsu, a step of causing the entire amount of slag remaining in the molten steel receiving section to flow out to the molten steel injection section through the slag communication hole, and a step of causing the molten steel receiving section to flow out. The steps of receiving molten steel from the second ladle and flowing the entire amount of slag remaining in the molten steel receiving section to the molten steel injection section through the slag communication hole are repeated, and during this period, the molten steel in the molten steel injection section is continuously fed. 2. The method of operating an oxidation-preventing tundish for continuous casting according to claim 1, characterized in that multi-continuous casting is carried out by injecting the oxidation-preventing tundish into a mold.

先ず、本発明によるタンディツシュの構成を第1図(A
)、(B)にて説明する。第1図は(A)、(B)はA
ストランド、Bストランドの2ストランド用のタンディ
ツシュを示す。
First, the configuration of the tandish according to the present invention is shown in FIG.
) and (B). Figure 1 is (A), (B) is A
A tundish for two strands, strand and B strand, is shown.

タンディツシュ2の中央部にその両端がタンディツシュ
2の側壁2Aに固定され、底部がタンディツシュ2の底
部壁2Bに固定され、上部が開放の耐火壁にて構成され
た2つの堰4が設けられており、2つの堰4の下部には
それぞれ溶鋼連通孔6が明けられている。
Two weirs 4 are provided in the center of the tanditsh 2, each of which has both ends fixed to the side wall 2A of the tanditsh 2, a bottom fixed to the bottom wall 2B of the tanditsh 2, and an open upper part made of a fireproof wall. , Molten steel communication holes 6 are provided at the bottoms of the two weirs 4, respectively.

この構成は従来のタンディツシュと同様であるが、本発
明の特徴は堰4の高さの1/2よりもやや上部にスラグ
8を流出させるスラグ連通孔10が設けられていること
である。
This structure is similar to a conventional tundish, but the feature of the present invention is that a slag communication hole 10 is provided slightly above 1/2 of the height of the weir 4 to allow the slag 8 to flow out.

〔作 用〕[For production]

上記構成のタンディツシュにおける作用について説明す
る。転炉で溶製され、必要によりRH真空脱ガス装置等
で精錬された溶鋼12は、取鍋に収容されて連続鋳造ヤ
ードに搬送される。本発明が対象としているTi含有鋼
量等の酸化され易い元素を含む溶鋼12はショートノズ
ル14を介して塩4内の溶鋼受入部16へ注入される。
The operation of the tandish with the above configuration will be explained. Molten steel 12 melted in the converter and refined by an RH vacuum degassing device or the like if necessary is stored in a ladle and transported to a continuous casting yard. Molten steel 12 containing easily oxidized elements such as Ti-containing steel, which is the object of the present invention, is injected into a molten steel receiving section 16 in salt 4 through a short nozzle 14 .

注入された溶鋼12は下部の溶鋼連通孔6を通って、そ
れぞれAストランド、Bストランドのta注入部18に
貯溜され、それぞれのタンディツシュノズル2OA、2
0Bおよび浸漬ノズル22A、22Bを介してそれぞれ
の鋳型24A、24Bに注入される。
The injected molten steel 12 passes through the lower molten steel communication hole 6 and is stored in the ta injection portions 18 of the A strand and B strand, respectively, and is supplied to the tundish nozzles 2OA and 2, respectively.
0B and into respective molds 24A, 24B via submerged nozzles 22A, 22B.

上記の工程までの作用は従来装置と同様であるが、連々
鋳を実施する場合は、第1取鍋の溶鋼受入部16へ注入
完了した後、いわゆる「組替り」と称して第2取鍋の同
−成分の溶鋼を受入れることとなるが、この場合堰4内
の溶鋼受入部16には第1取鍋のスラグ8が残存してお
り、第2取鍋の溶鋼12を注入する際には第1取鍋の残
存スラグ8層を通過するので、上記の如く、スラグ8層
のFeO等の酸化物にTi等の酸化し易い元素が酸化さ
れ、目標成分とすることができない。そのため従来は、
已むを得ずTi等の酸化割合を予想してTi投入量を増
加し、過剰Tiの溶鋼を第2取鍋の溶鋼としていた。
The operation up to the above process is the same as that of the conventional device, but when performing continuous casting, after the injection into the molten steel receiving section 16 of the first ladle is completed, the second ladle is However, in this case, the slag 8 from the first ladle remains in the molten steel receiving section 16 in the weir 4, and when pouring the molten steel 12 from the second ladle, Since it passes through the remaining 8 layers of slag in the first ladle, as mentioned above, easily oxidizable elements such as Ti are oxidized by oxides such as FeO in the 8 layers of slag, and cannot be used as target components. Therefore, conventionally,
Unavoidably, the amount of Ti added was increased in anticipation of the oxidation ratio of Ti, etc., and the molten steel containing excess Ti was used as the molten steel in the second ladle.

本発明においては、堰4の溶鋼連通孔6の上部にスラグ
連通孔10を設け、上記の無駄なTi等の酸化を防止す
るようにした。
In the present invention, a slag communication hole 10 is provided above the molten steel communication hole 6 of the weir 4 to prevent the above-mentioned wasteful oxidation of Ti and the like.

すなわち、第1取鍋の溶鋼12を溶鋼受入部16へ注入
完了したあと、鋳型24への注入を連続的に行うと、溶
鋼受入部16および溶鋼注入部18の溶鋼レベルが溶鋼
連通孔6およびスラグ連通孔10にて連通して同一レベ
ルまで下っているので、更に溶鋼レベルを下げるまで鋳
型24への注入を続けると、次にはスラグ連通孔10を
介して溶鋼受入部16中に残存していたスラグ8が溶鋼
注入部18へ流出する。
That is, when the molten steel 12 in the first ladle is poured into the molten steel receiving part 16 and then continuously poured into the mold 24, the molten steel level in the molten steel receiving part 16 and the molten steel injection part 18 reaches the level of the molten steel communicating hole 6 and the molten steel injecting part 18. Since the molten steel is communicated through the slag communication hole 10 and has descended to the same level, if the injection into the mold 24 is continued until the molten steel level is further lowered, the molten steel will remain in the molten steel receiving section 16 through the slag communication hole 10. The slag 8 flowing out flows into the molten steel injection section 18.

スラグ8がすべて溶鋼注入部18へ流出した後。After all of the slag 8 has flowed into the molten steel injection section 18.

第2取鍋からの溶鋼を塩4内の溶鋼受入部16に受ける
。かくすることにより、溶鋼受入部16に残存していた
厚い層のスラグ8が溶鋼注入部18の広い面に拡散され
るので、きわめて薄いスラグ層となり、溶鋼受入部16
には溶鋼注入部18と同一レベルの若干のスラグ層があ
っても、第2取鍋の1fR12の通過によってほとんど
酸化されることがない。
The molten steel from the second ladle is received in the molten steel receiving part 16 in the salt 4. By doing this, the thick layer of slag 8 remaining in the molten steel receiving section 16 is diffused over the wide surface of the molten steel injection section 18, resulting in an extremely thin slag layer, and the slag 8 remains in the molten steel receiving section 16.
Even if there is a slight slag layer at the same level as the molten steel injection part 18, it is hardly oxidized by the passage of 1fR12 of the second ladle.

第2図(A)、(B)、(C)、(D)により本発明に
よるタンディツシュによる多連鋳操業方法について説明
する。
The multiple casting operation method using a tundish according to the present invention will be explained with reference to FIGS. 2(A), (B), (C), and (D).

第2図(A)は第1取鍋の溶鋼12を塩4内の溶鋼受入
部16にショートノズルエ4を介して注入中の状況を示
す模式断面図である。注入された溶鋼12は下部の溶鋼
連通孔6を通過し、溶鋼注入部18に流出し、タンディ
ツシュ2は第2図(B)に示す如く溶鋼12によって満
たされ、取鍋から溶鋼受入部16へ流れ込んだスラグ8
は溶鋼注入部18へ流出せず、溶鋼受入部16の上部に
のみ残留する。この状態で鋳型24A、24Bへの注入
を始めると、タンディツシュ2の溶鋼レベルが降下し、
遂にスラグ連通孔10を通過して溶鋼受入部16中に滞
留していたスラグ8は溶鋼注入部18の全表面に流出す
る。第2図(C)はこの時点の状況を示す模式断面図で
ある。その後、第2取鍋から新しい溶ill・2をタン
ディツシュ2の溶鋼受入部16へ注入すると、スラグ層
8は極めて薄くなっているので、これを通過する新しい
溶鋼12は酸化されることはない。第2図(D)は第2
取鍋の溶鋼12の受入れを完了した状況を示し、タンデ
ィツシュ2は溶鋼12で満たされているが、第2図(B
)とスラグ状況が異なる。
FIG. 2(A) is a schematic cross-sectional view showing a situation in which the molten steel 12 in the first ladle is being poured into the molten steel receiving portion 16 in the salt 4 through the short nozzle 4. The injected molten steel 12 passes through the lower molten steel communication hole 6 and flows out into the molten steel injection part 18, and the tundish 2 is filled with the molten steel 12 as shown in FIG. Flowing slag 8
does not flow into the molten steel injection section 18 and remains only in the upper part of the molten steel receiving section 16. When pouring into the molds 24A and 24B is started in this state, the level of molten steel in Tanditsh 2 decreases,
Finally, the slag 8 that has passed through the slag communication hole 10 and remained in the molten steel receiving section 16 flows out onto the entire surface of the molten steel injection section 18. FIG. 2(C) is a schematic sectional view showing the situation at this point. Thereafter, when new molten steel 2 is injected from the second ladle into the molten steel receiving portion 16 of the tundish 2, the slag layer 8 is extremely thin, so the new molten steel 12 passing through it will not be oxidized. Figure 2 (D) is the second
Fig. 2 (B
) and the slag situation is different.

この操業を繰返し、第3、第4取鍋等の溶鋼12を順次
受入れ、鋳型24A、24Bへの注入を継続することに
より多連鋳操業を実施することができる。
By repeating this operation, sequentially receiving the molten steel 12 from the third and fourth ladles, and continuing to pour it into the molds 24A and 24B, a multiple casting operation can be performed.

今、タンディツシュ2の全湯面面積をSoとし、塩4内
の溶鋼受入部16の面積をSよとすれば、本発明による
ダンデイツシュ2の全湯面におけるスラグ8の厚みは従
来のS工/Soとなり、取組替えによる多連鋳数はSo
/S工倍に延長することが可能となった。
Now, if the total surface area of the tundish 2 is So, and the area of the molten steel receiving part 16 in the salt 4 is S, then the thickness of the slag 8 on the entire molten surface of the dandish 2 according to the present invention is the same as that of the conventional S process. So, the number of multiple casts due to reassignment is So
/S hours can now be extended.

〔実施例〕〔Example〕

C: 0.05%、Si:0.20%、Mn:0.50
%、Ti : 0.2%、A Q : 0.02%なる
鋼成分の溶鋼12を従来法により、スラグ8を塩4内の
溶鋼受入部16に閉じ込めて連々鋳を実施した場合と、
本発明によりスラグ8をスラグ連通孔10から溶鋼注入
部18へ流出し、連々鋳を実施した場合について、鋼中
のTiの歩留を比較試験した。
C: 0.05%, Si: 0.20%, Mn: 0.50
%, Ti: 0.2%, AQ: 0.02%. Molten steel 12 with a steel composition of 0.02% is successively cast by a conventional method with slag 8 confined in the molten steel receiving part 16 in the salt 4.
According to the present invention, the slag 8 flows out from the slag communication hole 10 to the molten steel injection part 18, and the yield of Ti in the steel is compared and tested for the case where continuous casting is performed.

なお、この試験において使用した取鍋溶鋼量は180t
、タンディツシュ容量20t、2001mx200rI
nx611Inのストランド連鋳機を用い、鋳込速度は
1.0m/minとして一定とした。
The amount of molten steel in the ladle used in this test was 180 tons.
, tandish capacity 20t, 2001m x 200rI
An nx611In strand continuous casting machine was used, and the casting speed was kept constant at 1.0 m/min.

上記比較試験によるTi歩留(%)は第1表のとおりで
あった。
The Ti yield (%) in the above comparative test was as shown in Table 1.

第1表 化したので3チヤージで中止した。本発明法による場合
は、第1表から明らかな如く、6チヤージ目で従来法の
3チヤージ目とほぼ等しい歩留となり、Ti歩留の急速
な悪化なしに約2倍数の多連鋳を実施することができた
I was on the first table, so I stopped after 3 charges. In the case of the method of the present invention, as is clear from Table 1, the yield at the 6th charge is almost the same as that at the 3rd charge of the conventional method, and multiple continuous castings of about twice the number can be performed without rapid deterioration of the Ti yield. We were able to.

〔発明の効果〕〔Effect of the invention〕

タンディツシュに溶鋼連通孔を有する堰を設けて連鋳す
る方法は、スラグを溶鋼注入部へ流出させず、fa全な
鋳片を製造するに有効な方法であるが、基円の溶鋼受入
部へ受は入れる第2、第3、取鍋の溶鋼は、基円の残留
スラグ層を通過することとなり、溶鋼の酸化を招く欠点
がある。特にTiの如き酸化し易い元素を含む溶鋼の場
合は、目標成分の鋳片を得がたく、酸化減少量を予定し
て冬目の元素を含有する溶鋼を溶製せざるを得す、しか
もなお鋳片中の該元素にばらつきを生ずる従来技術に鑑
み、本発明によるタンディツシュは、溶鋼連通孔の上部
にスラグ連通孔を設け、取鍋の1チヤージ注入毎に、基
円のスラグをすべてスラグ連通孔を介して溶鋼注入部へ
流出する操業方法をとったので、次の如き効果を挙げる
ことができた。
Continuous casting by providing a weir with a molten steel communication hole in the tundish is an effective method for producing slabs with perfect fa, without letting slag flow into the molten steel injection part, The molten steel in the second, third, and ladle into which the receiver is placed passes through the residual slag layer of the base circle, which has the drawback of causing oxidation of the molten steel. In particular, in the case of molten steel containing easily oxidized elements such as Ti, it is difficult to obtain slabs with the target composition, and it is necessary to prepare molten steel containing winter elements with a planned amount of oxidation reduction. In addition, in view of the conventional technology that causes variations in the elements in the slab, the tundish according to the present invention has a slag communication hole at the top of the molten steel communication hole, and every charge injection into the ladle, all the slag in the base circle is removed from the slag. Since we adopted an operating method in which the molten steel flows out to the molten steel injection section through the communication hole, we were able to achieve the following effects.

(イ)基円のスラグ層はきわめて薄くなるので、第2、
第3取鍋の溶鋼を受けても酸化されることがなく、特に
Tiの如き酸化され易い元素を含む鋼の場合は、酸化さ
れることがないので、目標成分の鋳片製造が容易である
(a) Since the slag layer of the base circle becomes extremely thin, the second
Even if it receives molten steel from the third ladle, it will not be oxidized, and especially steel containing easily oxidized elements such as Ti will not be oxidized, making it easy to manufacture slabs with the target composition. .

(ロ)連々鋳は勿論、取組替えを数回実施する多連鋳が
可能である。
(b) Not only continuous casting but also multiple casting in which the casting is changed several times is possible.

【図面の簡単な説明】[Brief explanation of drawings]

第1図(A)、(B)は本発明による連鋳用酸化防止タ
ンディツシュの実施例を示し、(A)は正面断面図、(
B)は平面断面図、第2図(A)、(B)、(C)、(
D)は本発明タンディツシュによる多連鋳操業中の取組
替えによる湯面、およびスラグ層の変化を示す模式断面
図であって、(A)は第1取鍋受人中の状況。 (B)は第1取鍋の受入完了時の状況 (C)は屠肉のスラグ連通孔を介して溶鋼注入部へ流出
後の状況 (D)第2取鍋の受入完了時の状況を示す。 2・・・・・・タンディツシュ 4・・・・・・堰 6・・・・・・溶鋼連通孔 8・・・・・・スラグ 10・・・・・・スラグ連通孔 12・・・・・・溶鋼 14・・・・・・ショートノズル 16・・・・・・溶鋼受入部 18・・・・・・溶鋼注入部
FIGS. 1(A) and 1(B) show an embodiment of the oxidation-preventing tundish for continuous casting according to the present invention, and FIG. 1(A) is a front sectional view, and FIG.
B) is a plan cross-sectional view, Figures 2 (A), (B), (C), (
D) is a schematic cross-sectional view showing changes in the molten metal level and slag layer due to reassembly during multiple casting operations using the tundish of the present invention, and (A) shows the situation in the first ladle receiver. (B) shows the situation when receiving the first ladle is completed; (C) shows the situation after the slag of the carcass has flowed into the molten steel injection part through the communication hole; (D) shows the situation when receiving the second ladle is completed. . 2... Tandish 4... Weir 6... Molten steel communication hole 8... Slag 10... Slag communication hole 12... - Molten steel 14... Short nozzle 16... Molten steel receiving section 18... Molten steel injection section

Claims (2)

【特許請求の範囲】[Claims] (1)取鍋からの溶鋼受入部と、鋳型への溶鋼注入部と
、前記溶鋼受入部と注入部とを仕切る堰と、前記堰の下
部に設けられた溶鋼連通孔とを有して成る連鋳用タンデ
イツシユにおいて、前記溶鋼連通孔の上部に前記溶鋼受
入部のスラグを前記溶鋼注入部へ流出するスラグ連通孔
を有することを特徴とする連鋳用酸化防止タンデイツシ
ユ。
(1) It has a molten steel receiving section from a ladle, a molten steel injection section into the mold, a weir that partitions the molten steel receiving section and the injection section, and a molten steel communication hole provided at the bottom of the weir. An oxidation-preventing tundish for continuous casting, characterized in that it has a slag communication hole above the molten steel communication hole through which slag in the molten steel receiving section flows out to the molten steel injection section.
(2)タンデイツシユの溶鋼受入部にて第1取鍋の溶鋼
を受入れる段階と、前記溶鋼受入部内に残留するスラグ
全量を前記スラグ連通孔を介して溶鋼注入部へ流出させ
る段階と、前記溶鋼受入部に第2取鍋の溶鋼を受入れる
段階と、前記溶鋼受入部に残留するスラグ全量を前記ス
ラグ連通孔を介して溶鋼注入部へ流出させる段階と、を
繰返し、この間前記溶鋼注入部の溶鋼を連続的に鋳型へ
注入して多連続鋳造を行うことを特徴とする請求項(1
)に記載の連鋳用酸化防止タンデイツシユの操業方法。
(2) A step of receiving the molten steel in the first ladle at the molten steel receiving section of the tundish; a step of causing the entire amount of slag remaining in the molten steel receiving section to flow out to the molten steel injection section through the slag communication hole; The steps of receiving molten steel from the second ladle into the molten steel receiving section and flowing out the entire amount of slag remaining in the molten steel receiving section to the molten steel injection section through the slag communication hole are repeated, and during this period, the molten steel in the molten steel injection section is Claim (1) characterized in that multiple continuous casting is performed by continuously injecting into a mold.
) The method of operating the oxidation-preventing tandate for continuous casting described in .
JP32121389A 1989-12-11 1989-12-11 Tundish for preventing oxidation in continuous casting and method for operating thereof Pending JPH03184659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32121389A JPH03184659A (en) 1989-12-11 1989-12-11 Tundish for preventing oxidation in continuous casting and method for operating thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32121389A JPH03184659A (en) 1989-12-11 1989-12-11 Tundish for preventing oxidation in continuous casting and method for operating thereof

Publications (1)

Publication Number Publication Date
JPH03184659A true JPH03184659A (en) 1991-08-12

Family

ID=18130068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32121389A Pending JPH03184659A (en) 1989-12-11 1989-12-11 Tundish for preventing oxidation in continuous casting and method for operating thereof

Country Status (1)

Country Link
JP (1) JPH03184659A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100909942B1 (en) * 2007-11-01 2009-08-04 주식회사 포스코 Dam of tundish for non-oxidizing cleansteel molding

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5731453A (en) * 1980-07-30 1982-02-19 Nippon Steel Corp Continuous casting method for steel
JPS6372452A (en) * 1986-09-16 1988-04-02 Nkk Corp Tundish weir

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5731453A (en) * 1980-07-30 1982-02-19 Nippon Steel Corp Continuous casting method for steel
JPS6372452A (en) * 1986-09-16 1988-04-02 Nkk Corp Tundish weir

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100909942B1 (en) * 2007-11-01 2009-08-04 주식회사 포스코 Dam of tundish for non-oxidizing cleansteel molding

Similar Documents

Publication Publication Date Title
US4250945A (en) Method of sequential continuous-casting of different grades of steel
JPS59225856A (en) Treatment method and device aiming at inoculation particularly of casting in low-pressure casting of liquid metal
JPH03184659A (en) Tundish for preventing oxidation in continuous casting and method for operating thereof
CN111570744B (en) Pouring device and pouring method of continuous casting machine
JPH084882B2 (en) Continuous casting method for heterogeneous small lot metal
JPH06320232A (en) Method for continuously casting complex metal material
JPH0133271B2 (en)
JPS566761A (en) Pouring method of molten metal in continuous casting
JPH0332452A (en) Method for continuously casting different steel kinds
JPS61147953A (en) Continuous casting method in which tundish having divided vessels is used
JPH04228247A (en) Method for starting pouring of molten steel into tundish from ladle
JPH0338017B2 (en)
JPS5514132A (en) Preventing method for oxygen entry of cast ingot in continuous casting and device thereof
JPH0331474Y2 (en)
RU2204460C2 (en) Method for continuous casting of steel
JPH03297545A (en) Method for continuously casting aluminum-killed steel
JPH0839196A (en) Production of continuously cast slab
JPH0542346A (en) Method for continuously casting different kinds of metals
JPH0985399A (en) Tundish for continuous casting and method for continuously pouring molten metal
JPH09271911A (en) Method for continuously casting steel
JPS5650764A (en) Continuous casting method of decreasing quality defect
JPH07100607A (en) Method for continuously casting steel
JPH07284879A (en) Production of continuously cast slab
JPS61119358A (en) Continuous casting method
JPS6247620B2 (en)