JPS60199555A - Continuous casting method and long nozzle to be used for said method - Google Patents
Continuous casting method and long nozzle to be used for said methodInfo
- Publication number
- JPS60199555A JPS60199555A JP5627584A JP5627584A JPS60199555A JP S60199555 A JPS60199555 A JP S60199555A JP 5627584 A JP5627584 A JP 5627584A JP 5627584 A JP5627584 A JP 5627584A JP S60199555 A JPS60199555 A JP S60199555A
- Authority
- JP
- Japan
- Prior art keywords
- long nozzle
- tundish
- molten metal
- ladle
- 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
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、？８融金属中に懸濁する非金属介在物を合理
的に除去して健全な連鋳片を製造する連続鋳造法および
その実施に使用する特殊なロングノズルに関する。[Detailed Description of the Invention] What is the present invention? 8. This invention relates to a continuous casting method for manufacturing sound continuous slabs by rationally removing non-metallic inclusions suspended in molten metal, and a special long nozzle used for carrying out the method.
例えば溶鋼の連続鋳造においては、第１図に図解的に示
したように、取鍋ｌ内の溶鋼はいったんタンディツシュ
２内に移され、このタンディツシュ２から鋳型３内に溶
鋼が連続的に導かれる。この取鍋１からタンディツシュ
２へ溶鋼を供給するには、取鍋１の底部にその上端を接
続したロングノズル４が使用され、タンディツシュ２か
ら鋳型３へ溶鋼を導くにはタンディツシュノズル５が使
用される。For example, in continuous casting of molten steel, as schematically shown in FIG. . To supply molten steel from the ladle 1 to the tundish 2, a long nozzle 4 whose upper end is connected to the bottom of the ladle 1 is used, and to guide molten steel from the tundish 2 to the mold 3, a tundish nozzle 5 is used. be done.
従来において、このロングノズル４は、上下端が開口し
た耐火物製の筒体が使用されていた。この場合、取鍋１
の底部に設けた流出口に１通常はスライディングノズル
を介して、このロングノズル４の上部の開口を接続し、
このロングノズル４の下方をタンディツシュ２内に挿入
して、ロングノズル４の下部の開口からタンディツシュ
２内に溶鋼を流出させていた。またタンディツシュ２が
ら鋳型３への注入も、タンディツシュ２と鋳型３を連通
させる上下開口のタンディツシュノズル５によって行わ
れていた。従って、取鍋１の溶鋼中に懸濁する非金属介
在物も溶鋼とともにタンディツシュ２内に入り、その一
部はこのタンディツシュ２内で浮上するものの、大部分
は鋳型３内に混入し、この鋳型２内で成る程度浮上分離
されはするが、凝固シェルに補足されるものもあり、こ
れが連鋳鋳片表面欠陥や内部欠陥の原因となって。Conventionally, the long nozzle 4 has been a cylinder made of refractory material with open upper and lower ends. In this case, ladle 1
Connect the upper opening of this long nozzle 4 to the outlet provided at the bottom of the long nozzle 1, usually through a sliding nozzle,
The lower part of the long nozzle 4 was inserted into the tundish 2, and molten steel was made to flow into the tundish 2 from the opening at the bottom of the long nozzle 4. Injection from the tundish 2 into the mold 3 was also carried out using a tundish nozzle 5 with upper and lower openings that communicated the tundish 2 and the mold 3. Therefore, non-metallic inclusions suspended in the molten steel in the ladle 1 also enter the tundish 2 together with the molten steel, and although some of them float up in the tundish 2, most of them get mixed into the mold 3 and are molded into the tundish 2. 2, some of them are captured by the solidified shell, which causes surface defects and internal defects in the continuously cast slab.
高級鋼の連鋳化を阻害したり５またホントチャージやダ
イレクトローリングを阻害する等の問題を引き起こして
いた。This caused problems such as inhibiting continuous casting of high-grade steel, and inhibiting real charging and direct rolling.
この問題の解決を図るために、従来より、取鍋内の溶鋼
自身の清浄化を図るべく前工程で種々の溶鋼の清浄化対
策を採ったり、あるいはタンディツシュ内で特殊な堰を
設置して非金属介在物が鋳型に流入しないようにする処
方などが提案または採用されていたが、余分な処理を必
要とする割りには、なかなか実効が上がらず、この非金
属介在物を効果的に分離できる操業上有利な処方の開発
が強く望まれていた。In order to solve this problem, various methods have been used to clean the molten steel in the ladle in the previous process, or by installing a special weir inside the tundish. Formulations that prevent metal inclusions from flowing into the mold have been proposed or adopted, but they require extra processing and have not been very effective. There was a strong desire to develop a formulation that would be advantageous for operation.
本発明の目的はこの要求を満たすことにあり。The purpose of the present invention is to meet this need.
取鍋内の溶融金属をロングノズルを経てタンディツシュ
に供給し、このタンディツシュ内の溶融金属を鋳型に注
入して連鋳片を製造する既述のようす連ｖＩ＆を造法に
おいて、このロングノズルにフィルター機能と交換機能
を持たせ、溶融金属がこのロングノズルを通過するさい
に溶融金属中に懸濁する非金属介在物を濾別することを
特徴とする連続鋳造法、並びに、この連鋳鋳造法を好適
に実施するためのロングノズルとして５一端のみ開口し
た筒状の形状を有し２ この筒状体における他方の開口
しない他端の部分またはその近傍の部分を。The molten metal in the ladle is supplied to the tundish through a long nozzle, and the molten metal in the tundish is injected into the mold to produce continuous cast pieces. A continuous casting method characterized by having a function and an exchange function and filtering out non-metallic inclusions suspended in the molten metal when the molten metal passes through the long nozzle, and this continuous casting method. As a long nozzle for suitably carrying out 5, it has a cylindrical shape with only one end open.
溶融金属が貫通できるに十分な細孔をもつ多孔質耐火物
製フィルターで構成したロングノズルを櫂供するもので
ある。The paddle is equipped with a long nozzle made of a porous refractory filter with pores large enough for molten metal to pass through.
すなわち本発明は、取鍋−タンデイソシュー鋳型という
溶融金属の流れのなかで、取鍋−タンディツシュ内を接
続するロングノズルを取り替え可能なフィルター構造体
として、この間で非金属介在物を濾別分離し、タンディ
ツシュ内に入る溶融金属中の非金属介在物濃度を一定水
準以下に維持すると同時に、濾別分離された非金属介在
物は多孔質耐火物と共に系外に除去するものである。That is, the present invention is a filter structure in which a long nozzle connecting the inside of the ladle and the tundish is replaceable in the flow of molten metal called the ladle and the tundish mold. However, while maintaining the concentration of nonmetallic inclusions in the molten metal entering the tundish below a certain level, the filtered and separated nonmetallic inclusions are removed from the system together with the porous refractory.
図面に従って具体的に説明すると、第２図は。To explain in detail according to the drawings, FIG.
取鍋１とタンディツシュ２とを接続するロングノズル部
分を拡大して示したもので１本発明においては、このロ
ングノズルとして、フィルター機能を持つものを使用す
る。図示の例では、従来のように両端を開口したものの
代わりに、上端だけ開口した底のある筒状体を使用し、
この底および下端部分を多孔質耐火物製フィルター５で
構成した例を示している。すなわぢ１図示のロングノズ
ル４は、取鍋１の底部の流出口に接続するための開口を
上部に有するが、下端は底を有しており、この底とタン
ディツシュ２内に挿入される部分のうちこの底に近い部
分、より具体的には、少なくともタンディツシュ２内の
溶鋼に浸漬される部分については、溶鋼は流出できるが
懸濁する非金属介在物を捕捉できるような細孔を多数設
けた多孔質耐火物５で構成し、その他の部分６（多孔質
耐火物５より上の部分）は溶鋼が流出しないような従来
同様の耐火物構造としである。This is an enlarged view of a long nozzle connecting a ladle 1 and a tundish 2. In the present invention, a long nozzle with a filter function is used as the long nozzle. In the illustrated example, a cylindrical body with a bottom that is open only at the top end is used instead of a conventional one that is open at both ends.
An example is shown in which the bottom and lower end portions are constructed of a porous refractory filter 5. In other words, the long nozzle 4 shown in FIG. 1 has an opening at the top for connection to the outlet at the bottom of the ladle 1, but has a bottom at its lower end, and is inserted into the tundish 2. The part of the section near the bottom, and more specifically, at least the part immersed in the molten steel in the tundish 2, has a large number of pores that allow the molten steel to flow out but trap suspended non-metallic inclusions. The other part 6 (the part above the porous refractory 5) has the same refractory structure as the conventional one to prevent molten steel from flowing out.
このフィルターを構成する材質は、耐火物であれば特に
制限を受けないが１図例の多孔質耐火物６はシリコンカ
ーバイドにアルミナコーティングしたものを用いている
。この多孔質耐火物６に設ける貫通孔はできるだけ小径
として孔の数を増すほうが孔内壁の面積が増大して非金
属介在物の威遇効率は向上する。しかし孔径があまり小
さいと溶鋼の通過時に凝固閉塞が生じやすくなるので。The material constituting this filter is not particularly limited as long as it is refractory, but the porous refractory 6 shown in Figure 1 is silicon carbide coated with alumina. If the diameter of the through holes provided in the porous refractory 6 is as small as possible and the number of holes is increased, the area of the inner wall of the hole will increase, and the efficiency with which nonmetallic inclusions will be treated will be improved. However, if the hole diameter is too small, solidification and blockage will easily occur when molten steel passes through.
実際には最少径が約１１ＩＩ１１φ程度となるようにす
るのがよい。このフィルターの形状としては円筒であっ
ても角状であってもよく、またロングノズル４の管内に
嵌合装着されるものであってもよい。In reality, it is preferable that the minimum diameter is approximately 11II11φ. The shape of this filter may be cylindrical or angular, or it may be fitted into the tube of the long nozzle 4.
本発明の実施にあたって、前記のフィルター機能をもつ
ロングノズル全体を、あるいはロングノズルからフィル
タ一部分だけを、取鍋１からタンディツシュ２へ注入が
終了したらその都度交換することによって、フィルタ一
部分の目詰まりによる非金属介在物分離の性能低下を回
避することができる。このロングノズル交換方式で非金
属介在物の分離効率を一定の水準に維持し、かつ系内か
らの非金属介在物の除去を簡便に行えるようにした点に
本発明の一つの特徴があり、これによって操業上非常に
合理的かつ有利に既述の目的が達成できる。In carrying out the present invention, by replacing the entire long nozzle having the above-mentioned filter function, or just a portion of the filter from the long nozzle, each time the injection from the ladle 1 to the tundish 2 is completed, it is possible to avoid clogging of a portion of the filter. Deterioration in the performance of separating nonmetallic inclusions can be avoided. One of the features of the present invention is that this long nozzle exchange method maintains the separation efficiency of nonmetallic inclusions at a certain level and allows easy removal of nonmetallic inclusions from the system. This makes it possible to achieve the above-mentioned objectives in a very operationally rational and advantageous manner.
実施例
第１図に示すような鋼の連鋳設備において使用されてい
たノズル孔が約１００ｍｍφのロングノズル４の吐出量
に合致するように、約２．抛ｍφの細孔を多数設けた第
２図に示すような多孔質耐火物５（シリコンカーバイド
にアルミナコーティングしたもの）をその下部に取りつ
けたロングノズルを使用し、それ以外は従来と同様にし
て、Ｃ；０．０６％、 Ｓｔ ： ０．０１％、 Ｍｎ
： ０．３０％、Ｐ ： ０．０１５％、Ｓ７０．０
１５％、 Ｓｏｌ、＾Ｉ ： ０．０４０％の低炭素ア
ルミキルド鋼を鋳造速度１．４ ｎ＋／ａ＋ｉｎで２５
０ Ｘ １１０５０ＩＩＩのスラブに連続鋳造した。鋳
造終了後、鋳片内の非金属介在物置を測定し、これを、
前記のノズル孔が約１００ｍｍφのロングノズルを使用
した従来例で得た同じ鋼の鋳片内の非金泥介在物量と比
較して示したのが第３図である。第３図より９本発明に
よると、従来の場合に比べて鋳片内の非金属介在物量は
約１１５にまで低下し、極めて簡易な処方であるにもか
かわらず連鋳鋳片の品質を大幅に向上させることができ
たことが判る。Embodiment The nozzle hole used in the continuous steel casting equipment as shown in FIG. A long nozzle with a porous refractory 5 (silicon carbide coated with alumina) attached to the bottom as shown in Fig. 2 with many pores of diameter mφ was used, but other than that, the process was the same as before. , C: 0.06%, St: 0.01%, Mn
: 0.30%, P: 0.015%, S70.0
15%, Sol,^I: 0.040% low carbon aluminum killed steel at a casting speed of 1.4 n+/a+in.
Continuously cast into 0 x 11050 III slabs. After casting, the non-metallic inclusions in the slab are measured and
FIG. 3 shows a comparison of the amount of non-gold inclusions in a slab of the same steel obtained in a conventional example using a long nozzle with a nozzle hole of about 100 mmφ. According to the present invention, the amount of non-metallic inclusions in the slab is reduced to about 115 compared to the conventional method, and the quality of the continuously cast slab is significantly improved despite the extremely simple recipe. It can be seen that it was possible to improve the
第１図は従来の連続鋳造設備の概略を示す離断面図、第
２図は本発明で使用するロングノズルの使用状態の例を
示す略断面図、第３図は本発明を適用した場合の鋳片内
非金属介在物の量を従来法と対比して示したグラフであ
る。
■・・取鍋、２・・タンディツシュ。
３・・鋳型、４・・ロングノズル。
５・・多孔質耐火物（フィルター）Fig. 1 is a cross-sectional view schematically showing a conventional continuous casting equipment, Fig. 2 is a schematic cross-sectional view showing an example of the usage state of the long nozzle used in the present invention, and Fig. 3 is a cross-sectional view showing an example of the usage state of the long nozzle used in the present invention. It is a graph showing the amount of non-metallic inclusions in a slab in comparison with a conventional method. ■...Ladle, 2...Tanditshu. 3. Mold, 4. Long nozzle. 5. Porous refractory (filter)
Claims (2)
ィツシュに供給し、このタンディツシュ内の溶融金属を
鋳型に注入して連鋳片を製造する方法において、前記の
ロングノズルにフィルター機能を持たせ、溶融金属がこ
のロングノズルを通過するさいにｆ４融金属中に懸濁す
る非金属介在物を濾別することを特徴とする連続鋳造法
。(1) In a method in which molten metal in a ladle is supplied to a tundish through a long nozzle, and the molten metal in the tundish is injected into a mold to produce continuous slabs, the long nozzle has a filter function. A continuous casting method characterized in that nonmetallic inclusions suspended in the F4 molten metal are filtered out when the molten metal passes through the long nozzle.
体における他方の開口しない他端の部分またはその近傍
の部分を、溶融金属が貫通できるに十分な細孔をもつ多
孔質耐火物製フィルターで構成した特許請求の範囲第１
項の連続鋳造法に使用するロングノズル。(2) A porous material that has a cylindrical shape with only one end open, and has sufficient pores to allow molten metal to penetrate the other end of the cylindrical body that is not open or its vicinity. Claim 1 consisting of a refractory filter
Long nozzle used in continuous casting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5627584A JPS60199555A (en) | 1984-03-26 | 1984-03-26 | Continuous casting method and long nozzle to be used for said method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5627584A JPS60199555A (en) | 1984-03-26 | 1984-03-26 | Continuous casting method and long nozzle to be used for said method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60199555A true JPS60199555A (en) | 1985-10-09 |
Family
ID=13022528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5627584A Pending JPS60199555A (en) | 1984-03-26 | 1984-03-26 | Continuous casting method and long nozzle to be used for said method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60199555A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60221158A (en) * | 1984-04-16 | 1985-11-05 | Nisshin Steel Co Ltd | Continuous casting installation |
| KR101244322B1 (en) | 2010-11-05 | 2013-03-14 | 주식회사 포스코 | Shroud Nozzle |
-
1984
- 1984-03-26 JP JP5627584A patent/JPS60199555A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60221158A (en) * | 1984-04-16 | 1985-11-05 | Nisshin Steel Co Ltd | Continuous casting installation |
| JPH0525585B2 (en) * | 1984-04-16 | 1993-04-13 | Nisshin Steel Co Ltd | |
| KR101244322B1 (en) | 2010-11-05 | 2013-03-14 | 주식회사 포스코 | Shroud Nozzle |
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