JPH0347662A - Semi-immersion nozzle for continuous casting - Google Patents

Semi-immersion nozzle for continuous casting

Info

Publication number
JPH0347662A
JPH0347662A JP17900489A JP17900489A JPH0347662A JP H0347662 A JPH0347662 A JP H0347662A JP 17900489 A JP17900489 A JP 17900489A JP 17900489 A JP17900489 A JP 17900489A JP H0347662 A JPH0347662 A JP H0347662A
Authority
JP
Japan
Prior art keywords
semi
immersion nozzle
continuous casting
mold
molten steel
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
JP17900489A
Other languages
Japanese (ja)
Inventor
Shoji Harada
原田 昭二
Kenji Sawai
澤井 賢治
Koji Toyoda
豊田 剛治
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 Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP17900489A priority Critical patent/JPH0347662A/en
Publication of JPH0347662A publication Critical patent/JPH0347662A/en
Pending legal-status Critical Current

Links

Landscapes

  • Continuous Casting (AREA)

Abstract

PURPOSE:To reduce involution of powder by forming thickness of immersing part of a semi-immersion nozzle thicker than that of non-immersing part by the specific thickness at the time of continuous casting. CONSTITUTION:Molten steel 2 is poured into a mold 6 from a tundish 1 through the semi-immersion nozzle 7. Then, by drawing means, a cast slab formed, after solidifying, in the mold 6 is continuously drawn downward to execute continuous casting. In the case the semi-immersion nozzle 7 is melted off during pouring the molten steel 2, this is exchanged for the fresh one. At this time, as the thickness of immersing part of the semi-immersion nozzle 7 is thicker than that of non-immersing part by >=10%, the semi-immersion nozzle 7 is made difficult to melt off. Therefore, frequency for exchanging the semi- immersion nozzles 7 is made few and the involution of powder 9 into solidified shell 11 can be reduced and defect in the quality can be reduced.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、連続鋳造の際に鋳型内の溶湯に浸漬され、
タンデイツシュから鋳型へ溶湯を供給する連続鋳造用セ
ミイマージョンノズルに関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for casting a metal that is immersed in molten metal in a mold during continuous casting.
This invention relates to a semi-immersion nozzle for continuous casting that supplies molten metal from a tundish to a mold.

[従来の技術及び発明が解決しようとする課題]鋼の連
続鋳造は、溶鋼を取鍋からロングノズルを介して−Hタ
ンディッシュに貯留し、このタンデイツシュからセミイ
マージョンノズルを介して鋳型に注入し、鋳型内で溶湯
が冷却して形成された鋳片を連続的に下方へ引き抜き、
連続的に所望の鋼材を得る技術である。
[Prior art and problems to be solved by the invention] Continuous casting of steel involves storing molten steel from a ladle in a -H tundish through a long nozzle, and injecting the molten steel from this tundish into a mold through a semi-immersion nozzle. , the molten metal is cooled in the mold and the slab formed is continuously pulled downward.
This is a technology to continuously obtain desired steel materials.

この場合に、タンデイツシュから鋳型へ溶鋼を供給する
ためのセミイマージョンノズルは、溶鋼の酸化防止の観
点から鋳型内の溶鋼中に浸漬される。また、鋳型内の溶
鋼上には溶鋼の酸化防止及び不純物の吸着等を目的とし
て金属酸化物を主体としたモールドパウダーが浮遊せし
められている。
In this case, a semi-immersion nozzle for supplying molten steel from the tundish to the mold is immersed in the molten steel in the mold from the viewpoint of preventing oxidation of the molten steel. Furthermore, molding powder mainly composed of metal oxides is suspended above the molten steel in the mold for the purpose of preventing oxidation of the molten steel and adsorbing impurities.

ところで、セミイマージョンノズルは、主成分が5in
2であり、鋳型内のスラグすなわち溶融パウダによって
浸蝕され、100分間程度で溶断する。従って、溶断直
前でこのセミイマージョンノズルを取り外し、新しいも
のと交換しなければならない。セミイマージョンノズル
を交換する際には、タンデイツシュからの注入流は、直
接鋳型内のパウダに当たるため、パウダを凝固シェル内
に巻き込み、製品にブローホール等の欠陥が発生してし
まう。
By the way, the main component of the semi-immersion nozzle is 5 inches.
2, it is eroded by the slag in the mold, that is, the molten powder, and melts and breaks in about 100 minutes. Therefore, the semi-immersion nozzle must be removed and replaced with a new one just before the melting occurs. When replacing the semi-immersion nozzle, the injection flow from the tundish nozzle directly hits the powder in the mold, causing the powder to be drawn into the solidified shell and causing defects such as blowholes in the product.

この発明はかかる事情に鑑みてなされたものであって、
パウダ巻き込みを少なくすることができる連続鋳造用セ
ミイマージョンノズルを提供することを目的とする。
This invention was made in view of such circumstances, and
An object of the present invention is to provide a semi-immersion nozzle for continuous casting that can reduce powder entrainment.

[課題を解決するための手段] この発明に係る連続鋳造用セミイーマージョンノズルは
、連続鋳造の際にタンデシュから鋳型に溶湯を供給する
ための連続鋳造用セミイマージョンノズルであって、そ
の浸漬部の肉厚が非浸漬部の肉厚よりも10%以上厚く
形成されていることを特徴とする。
[Means for Solving the Problems] A semi-immersion nozzle for continuous casting according to the present invention is a semi-immersion nozzle for continuous casting for supplying molten metal from a tundish to a mold during continuous casting. The thickness of the non-immersed portion is 10% or more thicker than the thickness of the non-immersed portion.

[作用] この発明においては、浸漬部の肉厚を非浸漬部の肉厚よ
りも10%以上厚くしたので、ノズルがスラグにより浸
蝕されても溶断する頻度を少なくすることができる。従
って、セミイマージョンノズルの交換頻度を少なくする
ことができ、それたけ凝固シェル内のパウダ巻き込み量
を低減することができる。
[Function] In this invention, since the wall thickness of the immersed part is made 10% or more thicker than the wall thickness of the non-immersed part, even if the nozzle is corroded by slag, the frequency of fusing can be reduced. Therefore, the frequency of replacing the semi-immersion nozzle can be reduced, and the amount of powder caught in the solidified shell can be reduced accordingly.

[実施例] 以下、この発明の実施例について具体的に説明する。[Example] Examples of the present invention will be described in detail below.

第1図はこの実施例に係るセミイマージョンノズルを示
す断面図、第2図はこの発明に係るセミイマージョンノ
ズルを用いた連続鋳造装置を示す断面図である。第2図
において、タンデイシュ1内には、図示しない取鍋から
供給された溶鋼2が貯留されており、その上にはスラグ
3が浮遊している。タンデイツシュ1の底壁には、溶鋼
流出口4が形成されており、溶鋼流出口4にはタンデイ
ツシュノズル5が嵌め込まれている。溶鋼流出口4の上
方には流量調節用のストッパ12が設けられており、図
示しない駆動手段により上下動して溶鋼流量を調節する
ようになっている。
FIG. 1 is a cross-sectional view showing a semi-immersion nozzle according to this embodiment, and FIG. 2 is a cross-sectional view showing a continuous casting apparatus using the semi-immersion nozzle according to the present invention. In FIG. 2, molten steel 2 supplied from a ladle (not shown) is stored in a tundish 1, and slag 3 is floating above it. A molten steel outlet 4 is formed in the bottom wall of the tundish 1, and a tundish nozzle 5 is fitted into the molten steel outlet 4. A stopper 12 for adjusting the flow rate is provided above the molten steel outlet 4, and is moved up and down by a drive means (not shown) to adjust the flow rate of the molten steel.

タンデイツシュ1の下方には鋳型6が設けられており、
この鋳型6に溶鋼2が注入されて連続鋳造される。鋳型
6の鋳込み空間において、鋳型6に注入された溶鋼2の
上には金属酸化物を主体とするモールドパウダ9が浮遊
せしめられており、生パウダと溶鋼との間には溶融スラ
グ1oが形成されている。また、溶鋼2と鋳型6との間
には凝固シェル11が形成されている。そして、溶鋼の
注入に際して、セミイマージョンノズル7が用いられる
A mold 6 is provided below the tandate 1.
Molten steel 2 is poured into this mold 6 and continuously cast. In the casting space of the mold 6, mold powder 9 mainly composed of metal oxides is suspended above the molten steel 2 poured into the mold 6, and molten slag 1o is formed between the raw powder and the molten steel. has been done. Further, a solidified shell 11 is formed between the molten steel 2 and the mold 6. A semi-immersion nozzle 7 is used to inject the molten steel.

セミイマージョンノズル7は、支持部材8により支持さ
れており、上部が朝顔状に形成されており、下部が鋳型
6の鋳込み空間に挿入される。鋳造の定常状態において
は、その下部が鋳型6内の溶鋼に浸漬される。そして、
下部の浸漬部の肉厚が、上部の非浸漬部の肉厚よりも1
0%以上厚く形成されている。
The semi-immersion nozzle 7 is supported by a support member 8, has an upper part shaped like a morning glory, and a lower part inserted into the casting space of the mold 6. In the steady state of casting, its lower part is immersed in the molten steel in the mold 6. and,
The thickness of the lower immersed part is 1 greater than the thickness of the upper non-immersed part.
It is formed thicker than 0%.

このような連続鋳造装置において、タンデイツシュ1か
らセミイマージョンノズル7を介して鋳型6に溶鋼2を
注入する。そして、図示しない引き抜き手段により、鋳
型6内で凝固して形成された鋳片を連続的に下方へ引き
抜き連続鋳造を行う。
In such a continuous casting apparatus, molten steel 2 is injected from a tandy shell 1 into a mold 6 via a semi-immersion nozzle 7. Then, by a drawing means (not shown), the slab solidified within the mold 6 is continuously drawn downward to perform continuous casting.

溶鋼の注入中にセミイマージョンノズルが溶断した場合
には、新しいものと交換するが、この発明においてはセ
ミイマージョンノズルの浸漬部の肉厚が、非浸漬部の肉
厚よりも厚いので、セミイマージジンノズルが溶断され
にくくなっている。
If the semi-immersion nozzle blows out during injection of molten steel, it should be replaced with a new one. However, in this invention, the thickness of the immersed part of the semi-immersion nozzle is thicker than the thickness of the non-immersed part, so the semi-immersion nozzle is replaced with a new one. The gin nozzle is less likely to be fused.

従って、セミイマージッンノズルの交換頻度を少なくす
ることができ、凝固シェル11へのパウダの巻き込みを
低減することができ、品質欠陥を少なくすることができ
る。なお、セミイマージョンノズルの浸漬部の肉厚の付
加が10%未満の場合には、交換頻度を少なくする効果
が少ないので、浸漬部と非浸漬部との厚みの差を10%
以上とする。
Therefore, the frequency of replacing the semi-immersive nozzle can be reduced, the entrainment of powder into the solidified shell 11 can be reduced, and quality defects can be reduced. Note that if the thickness of the immersed part of the semi-immersion nozzle is less than 10%, there is little effect in reducing the frequency of replacement, so the difference in thickness between the immersed part and the non-immersed part is reduced by 10%.
The above shall apply.

実際に浸漬部の厚みを非浸漬部よりも10%増加させた
サンプルを作成して、ノズルの溶断テストを行った結果
、従来のセミイマージョンノズルでは100分間で溶断
したのに対し、このサンプルでは160分間まで溶断し
なかった。このことからこの発明の効果が確認された。
We actually made a sample with the immersed part 10% thicker than the non-immersed part and conducted a nozzle fusing test.As a result, the conventional semi-immersion nozzle melted in 100 minutes, but this sample It did not melt until 160 minutes. This confirmed the effectiveness of this invention.

[発明の効果] この発明によれば、浸漬部の肉厚を非浸漬部の肉厚より
も10%以上厚くしたので、交換頻度を少なくすること
ができ、製品の品質欠陥を低減することができる。
[Effects of the Invention] According to the present invention, the wall thickness of the immersed part is made 10% or more thicker than the wall thickness of the non-immersed part, so it is possible to reduce the frequency of replacement and reduce product quality defects. can.

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

第1図はこの発明の実施例に係るセミイマージ日ンノズ
ルを示す断面図、第2図はこのセミイマ−ジョンノズル
を適用した連続鋳造装置を示す模式図である。 1;タンデイツシュ、2:溶鋼、6;鋳型、7;セミイ
マージジンノズル、9;パウダ、10;溶融スラグ。
FIG. 1 is a sectional view showing a semi-immersion nozzle according to an embodiment of the present invention, and FIG. 2 is a schematic view showing a continuous casting apparatus to which this semi-immersion nozzle is applied. 1: Tundish, 2: Molten steel, 6: Mold, 7: Semi-image nozzle, 9: Powder, 10: Molten slag.

Claims (1)

【特許請求の範囲】[Claims] 連続鋳造の際にタンデシュから鋳型に溶湯を供給するた
めの連続鋳造用セミイマージョンノズルであって、その
浸漬部の肉厚が非浸漬部の肉厚よりも10%以上厚く形
成されていることを特徴とする連続鋳造用セミイマージ
ョンノズル。
A semi-immersion nozzle for continuous casting for supplying molten metal from a tundish to a mold during continuous casting, the wall thickness of the immersed part being 10% or more thicker than the thickness of the non-immersed part. Features a semi-immersion nozzle for continuous casting.
JP17900489A 1989-07-13 1989-07-13 Semi-immersion nozzle for continuous casting Pending JPH0347662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17900489A JPH0347662A (en) 1989-07-13 1989-07-13 Semi-immersion nozzle for continuous casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17900489A JPH0347662A (en) 1989-07-13 1989-07-13 Semi-immersion nozzle for continuous casting

Publications (1)

Publication Number Publication Date
JPH0347662A true JPH0347662A (en) 1991-02-28

Family

ID=16058433

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17900489A Pending JPH0347662A (en) 1989-07-13 1989-07-13 Semi-immersion nozzle for continuous casting

Country Status (1)

Country Link
JP (1) JPH0347662A (en)

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