JP3050101B2 - Continuous casting pouring equipment - Google Patents
Continuous casting pouring equipmentInfo
- Publication number
- JP3050101B2 JP3050101B2 JP7244885A JP24488595A JP3050101B2 JP 3050101 B2 JP3050101 B2 JP 3050101B2 JP 7244885 A JP7244885 A JP 7244885A JP 24488595 A JP24488595 A JP 24488595A JP 3050101 B2 JP3050101 B2 JP 3050101B2
- Authority
- JP
- Japan
- Prior art keywords
- flow
- immersion nozzle
- cross
- continuous casting
- flow path
- 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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- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は、金属鋳片(例えば
ビレット、ブルーム、スラブ)の連続鋳造法において用
いられる連続鋳造用注入装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting apparatus for continuous casting used in a continuous casting method for metal slabs (for example, billets, blooms, slabs).
【0002】[0002]
【従来の技術】鉄鋼の鋳造にはインゴット鋳造法と連続
鋳造法があるが、連続鋳造法は分塊・圧延操作が節減で
きる他、歩留りを向上させると共に、製品の品質が改善
されるといった多くの利点を有しており、今日の鉄鋼製
造工程における鋳造法において主流となっている。この
様な種々の利点を有する連続鋳造法の残された課題の中
心は、鋳片の100%直行化、及び操業の自動化であ
る。2. Description of the Related Art There are two types of steel casting: ingot casting and continuous casting. Continuous casting can reduce the slab and rolling operations, improve the yield, and improve the product quality. It has become the mainstream in the casting method in the steelmaking process today. The main remaining issues of the continuous casting method having these various advantages are 100% straightening of the slab and automation of the operation.
【0003】上記課題のうち直行化は、鋳片製造後の冷
却,検査,手入れ,再加熱といった工程を省略し、品質
保証できる鋳片を直接、圧延工程に送ることであり、人
件費や燃料費の削減、製造時間の短縮を図るものであ
る。しかし、鋳片の品質欠陥の発生により、直行化の実
施が大きく阻害されている。[0003] Of the above-mentioned problems, the direct approach is to omit processes such as cooling, inspection, care, and reheating after the production of slabs, and to directly send slabs of which quality can be assured to the rolling process. The aim is to reduce costs and manufacturing time. However, the occurrence of the quality defect of the slab has greatly hindered the implementation of the straightening.
【0004】また、他方の課題である操業の自動化は、
今後の熟練工の減少に向けての対策、人件費削減等の意
味を持つが、その推進にはブレークアウトに代表される
操業トラブルの撲滅が前提となる上に、耐火物交換等の
メンテナンス作業を極力軽減することが重要である。On the other hand, automation of operation, which is another problem,
It has the meaning of measures to reduce the number of skilled workers in the future, reduction of labor costs, etc.It is premised on elimination of operational troubles typified by breakouts, and maintenance work such as refractory replacement is required. It is important to reduce as much as possible.
【0005】図14の(a)は従来の連続鋳造用注入装
置を示す縦断面図であり、図14の(b)は図14の
(a)におけるa−a線での横断面図である。タンディ
ッシュ(図示せず)内の溶融金属(溶鋼)は、インサー
トノズル5から導入され、スライドバルブ(流量調整
弁)4にて流量が調節されて、整流ノズル3及び浸漬ノ
ズル1を介して流下し、浸漬ノズル1の吐出口15から
鋳型(図示せず)内に供給される。尚、浸漬ノズル1の
外周側壁には、鋳型内フラックスによる浸漬ノズル1の
侵食を防止する為に、耐火物7を設けても良い。FIG. 14 (a) is a longitudinal sectional view showing a conventional casting apparatus for continuous casting, and FIG. 14 (b) is a transverse sectional view taken along the line aa in FIG. 14 (a). . The molten metal (molten steel) in the tundish (not shown) is introduced from the insert nozzle 5, the flow rate is adjusted by a slide valve (flow rate adjusting valve) 4, and flows down through the rectifying nozzle 3 and the immersion nozzle 1. Then, it is supplied from a discharge port 15 of the immersion nozzle 1 into a mold (not shown). Incidentally, a refractory 7 may be provided on the outer peripheral side wall of the immersion nozzle 1 in order to prevent erosion of the immersion nozzle 1 by the flux in the mold.
【0006】また浸漬ノズル1の内面には、アルミナや
地金等の付着を防止する目的で、浸漬ノズル管内に不活
性ガスを導入する等の方法が採られているが、溶鋼内で
のガス浮上が後述する理由によって不均一となり、かえ
って製品欠陥を招く基ともなる。A method of introducing an inert gas into the immersion nozzle tube has been adopted for the purpose of preventing adhesion of alumina, ingot, etc. to the inner surface of the immersion nozzle 1. Levitation becomes non-uniform due to the reasons described below, which may also lead to product defects.
【0007】[0007]
【発明が解決しようとする課題】従来の連続鋳造用注入
装置を用いて鋳造した鋳片は、凝固が不均一であった
り、鋳片に介在物欠陥やピンホール欠陥を生じるという
問題があった。更には不均一凝固の為に鋳片に割れを生
じることがあり、また鋳造中にブレークアウトを引き起
こすといった問題があった。そこで本発明者らはこれら
不均一凝固,介在物混入,ピンホール欠陥,ブレークア
ウト等といった問題の発生機構について、詳細な検討を
行った。The slab cast using the conventional continuous casting pouring apparatus has problems that the solidification is non-uniform and that the slab has inclusion defects and pinhole defects. . Further, there is a problem that a slab may be cracked due to uneven solidification, and a breakout occurs during casting. Therefore, the present inventors have studied in detail the mechanism of the occurrence of such problems as non-uniform solidification, inclusion inclusion, pinhole defect, breakout and the like.
【0008】つまり従来の考えでは、鋳型内での凝固殻
厚みは、鋳型内溶鋼から鋳型壁への抜熱量の結果ととら
えられており、しかもこの場合の鋳型内の溶鋼は全く静
止状態と仮定されている。しかしながら、最近の鋼スラ
ブ連続鋳造を例にとれば、既に2.0m/分以上の鋳造
速度での操業も珍しくない程に高速化しており、この様
な高速鋳造の下では、浸漬ノズルから鋳型内に供給され
る溶鋼によって、鋳型内の溶鋼が相当にかき乱されるこ
とになる。In other words, according to the conventional idea, the thickness of the solidified shell in the mold is regarded as a result of the amount of heat removed from the molten steel in the mold to the mold wall, and in this case, the molten steel in the mold is assumed to be completely stationary. Have been. However, taking the recent continuous casting of steel slabs as an example, the operation at a casting speed of 2.0 m / min or more has already been accelerated to an unusual speed. The molten steel supplied into the mold will significantly disturb the molten steel in the mold.
【0009】即ち、従来の静的なとらえ方では問題視さ
れていなかった凝固殻への溶鋼からの熱流入が無視でき
なくなっており、鋳型内溶鋼流動の観点から連続鋳造を
とらえる必要がある。つまり凝固殻厚みは、鋳型抜熱量
から、凝固殻への溶鋼からの入熱量を差し引いた熱収支
の結果ととらえなければならない。この観点による検討
結果について以下に述べる。まず凝固殻への溶鋼からの
熱流入についての溶鋼流速と熱伝達係数の関係について
説明する。That is, the heat inflow from the molten steel into the solidified shell, which has not been regarded as a problem in the conventional static method, cannot be ignored, and it is necessary to capture continuous casting from the viewpoint of the flow of molten steel in the mold. In other words, the thickness of the solidified shell must be taken as the result of the heat balance obtained by subtracting the amount of heat input from the molten steel into the solidified shell from the amount of heat removed from the mold. The examination results from this viewpoint are described below. First, the relationship between the flow rate of molten steel and the heat transfer coefficient for heat inflow from molten steel into the solidified shell will be described.
【0010】Nusselt 数(Nu)はこの熱伝達係数を決
定する数値であるが、壁温が一定の正方形断面を流れる
溶融金属のNuは、下式(1)で示されることが知られ
ている(J.P.HARTNETT AND T.F.IRVINE 、57-NESC-30,1
957,PHILADELPHIA参照) 。 Nu=(2/3)Nus+0.019Pe0.8 …(1) Nus:4.93(定数) Pe:Pecret数 Pe=VL/a …(1a) V:流速 L:注目した部分の長さ a:温度伝達係数(鋼に固有の値) 式(1)と式(1a)から分かる様に、Nuは溶鋼の流
速の関数で示され、NuとVとはNu∝V0.8 の関係に
ある。The Nusselt number (Nu) is a numerical value that determines the heat transfer coefficient. It is known that Nu of a molten metal flowing through a square cross section having a constant wall temperature is represented by the following equation (1). (JPHARTNETT AND TFIRVINE, 57-NESC-30,1
957, PHILADELPHIA). Nu = (2/3) Nus + 0.019Pe 0.8 (1) Nus: 4.93 (constant) Pe: Pecret number Pe = VL / a (1a) V: Flow rate L: Length of focused portion a: Temperature Transfer coefficient (value specific to steel) As can be seen from equations (1) and (1a), Nu is represented by a function of the flow rate of molten steel, and Nu and V have a relationship of Nu∝V 0.8 .
【0011】図17はNuとReynold 数(Re)の関係
を表すグラフである。Re=Pe/Prの関係があり
[Pr(Prantle 数)は定数]、従ってNuとReの関
係も上記式(1)と同様の関係を有し、Reが大きくな
るとNuが増加することを示す。図17のカーブから分
かる様に、Nuが急激に増加するある流速が存在する。
図18は、最近の鋼スラブ連続鋳造機の操業時における
溶鋼流れを表す模式断面図であり、鋳型6の内壁側には
凝固殻8が形成されている。FIG. 17 is a graph showing the relationship between Nu and the Reynold number (Re). There is a relationship of Re = Pe / Pr [Pr (Prantle number) is a constant]. Therefore, the relationship between Nu and Re also has the same relationship as in the above equation (1), and shows that Nu increases as Re increases. . As can be seen from the curve in FIG. 17, there is a certain flow rate at which Nu sharply increases.
FIG. 18 is a schematic cross-sectional view showing the flow of molten steel during the operation of a recent steel slab continuous caster. A solidified shell 8 is formed on the inner wall side of the mold 6.
【0012】最近の操業においては、上述の様に、2.
0m/分以上も珍しくない程に鋳造速度が上昇している
ため、浸漬ノズル1からの吐出流が凝固殻8に衝突する
ときのNuは、流速ゼロのときのNuの50倍に達する
こともある。更には下述の様に、浸漬ノズルからの吐出
流に偏りがあると、偏った側の衝突流れによってNuの
上昇を来す。In recent operations, as described above, 2.
Since the casting speed has increased so as not to be unusual even at 0 m / min or more, Nu when the discharge flow from the immersion nozzle 1 collides with the solidified shell 8 may reach 50 times that of Nu when the flow velocity is zero. is there. Further, as described below, when the discharge flow from the immersion nozzle is deviated, Nu is increased by the impinging flow on the deviated side.
【0013】このNuは衝突溶鋼流が有する熱エネルギ
ーを凝固殻に伝達する割合を示すものであるから、Nu
の過度の上昇は、凝固から鋳型への抜熱量を上回る熱流
入を生じる場合を引き起こす。これにより鋳型内の凝固
殻進展の停滞、更には凝固殻の再溶解現象が生ずる。Since this Nu indicates the rate at which the thermal energy of the impinging molten steel flow is transmitted to the solidified shell, Nu is used.
Excessive rise in the temperature may cause heat flow from solidification to the mold that exceeds the heat removal. This causes a stagnation of the solidified shell in the mold, and further causes a phenomenon of re-dissolution of the solidified shell.
【0014】ところで、鋳造途中で金を添加し、凝固し
たスラブ鋳片狭面の凝固進捗状況を、放射線照射による
印画紙への感光方法によって観察したところ、凝固界面
に凹凸が見られた。この凹凸は従来の鋳型・凝固殻間の
熱伝達理論では説明しきれないものであったが、これは
吐出流がジェットとなり凝固界面に衝突したことによっ
て凝固界面への熱供給過多が生じ、これによって起こっ
た結果であると理解される。以上のことから、不均一凝
固をなくすには、Nuを低く押さえた鋳型内溶鋼流動を
実現することが重要であるとの結論を得た。By the way, the progress of solidification on the narrow surface of the slab slab, which had been added with gold during the casting and solidified, was observed by a method of exposing photographic paper to radiation by irradiation. As a result, irregularities were observed at the solidification interface. This unevenness could not be explained by the conventional theory of heat transfer between the mold and the solidified shell.However, the discharge flow became a jet and collided with the solidified interface, resulting in excessive heat supply to the solidified interface. Are understood to be the consequences of From the above, it was concluded that it is important to realize the molten steel flow in the mold with a low Nu in order to eliminate uneven solidification.
【0015】この様な鋳型内溶鋼流動を実現するには、
下記の3点が重要である。まず第一は浸漬ノズルからの
吐出流の偏りをなくすことである。タンディッシュから
鋳型内に溶鋼を注湯するに際して、流量調節弁として一
般に2層式あるいは3層式のスライドバルブやストッパ
が用いられるが、溶鋼がここを通過するときに流れの偏
りを生じ、その偏りが改善されないまま浸漬ノズルの吐
出口から吐出される。この様な吐出流の偏りにより、鋳
型内の溶鋼流動にも偏りが生じ、不均一凝固を生じる原
因となるのである。In order to realize such molten steel flow in the mold,
The following three points are important. The first is to eliminate the bias of the discharge flow from the immersion nozzle. When pouring molten steel from a tundish into a mold, a two-layer or three-layer slide valve or stopper is generally used as a flow control valve. However, when the molten steel passes therethrough, the flow is biased. The liquid is discharged from the discharge port of the immersion nozzle without improving the bias. Such a deviation in the discharge flow also causes a deviation in the flow of the molten steel in the mold, causing uneven solidification.
【0016】この様な吐出流の偏りを改善するために、
図15に示す様な連続鋳造用注入装置が提案された。図
15の(a)は該連続鋳造用注入装置の縦断面図であ
り、そのe−e線での横断面が図15の(b)である。
この連続鋳造用注入装置は浸漬ノズル21の吐出口15
直上の内壁に環状段部2を設けたものである。尚、図1
4と同じ構成部分については同一の符号を付して重複説
明を避ける。In order to improve the bias of the discharge flow,
A casting apparatus for continuous casting as shown in FIG. 15 has been proposed. FIG. 15A is a longitudinal sectional view of the continuous casting pouring apparatus, and a transverse section taken along line ee is FIG. 15B.
The injection device for continuous casting is connected to the discharge port 15 of the immersion nozzle 21.
An annular step 2 is provided on the inner wall immediately above. FIG.
The same components as in FIG. 4 are denoted by the same reference numerals, and redundant description will be avoided.
【0017】この様な段部2を設けることによって、そ
れより上流側に流れ抵抗が生じて流れの偏りが改善さ
れ、従って吐出流の偏りも上記従来例(図14)に比べ
てかなり改善される。しかし未だ不十分であり、鋳片に
多数の不均一凝固部を形成する問題は未解決として残さ
れる。By providing such a stepped portion 2, a flow resistance is generated on the upstream side thereof, so that the deviation of the flow is improved. Therefore, the deviation of the discharge flow is considerably improved as compared with the conventional example (FIG. 14). You. However, it is still insufficient, and the problem of forming a large number of non-uniformly solidified portions in a slab remains as an unsolved problem.
【0018】図16は図15の連続鋳造用注入装置を用
いた場合において、鋳型内の溶鋼流動について数値計算
して得られた結果を示す模式図である。図中、8は鋳型
の内周壁に沿って形成された凝固殻であり、鋳型内溶鋼
の温度分布が実線で表されている。FIG. 16 is a schematic diagram showing the results obtained by numerically calculating the flow of molten steel in a mold when the casting apparatus for continuous casting shown in FIG. 15 is used. In the figure, reference numeral 8 denotes a solidified shell formed along the inner peripheral wall of the mold, and the temperature distribution of the molten steel in the mold is represented by a solid line.
【0019】図16に見られる様に、左の吐出口15と
右の吐出口15では吐出溶鋼の流動が異なっており、従
ってこの吐出流動不均一は全周面で認められるものであ
り、その結果不均一凝固の原因となり、また鋳型表
面溶鋼の温度も円周方向で異なり、粘性に差が生じて、
気泡の上昇が不均一となる。As shown in FIG. 16, the flow of the molten steel discharged is different between the left discharge port 15 and the right discharge port 15, so that the non-uniform discharge flow is observed on the entire peripheral surface. As a result, it causes uneven solidification, and the temperature of the molten steel on the mold surface also varies in the circumferential direction, resulting in a difference in viscosity.
Non-uniform rise of bubbles.
【0020】第二の課題としては、流量調整弁,整流ノ
ズル,浸漬ノズル等の隙間からの大気の吸い込みを防止
する点が挙げられる。即ち流量調整弁で絞られた溶鋼流
は、整流ノズル,浸漬ノズルに至って流路横断面積が広
くなるので、ここで急激な負圧に曝されることになる。
この負圧によって流量調整弁,整流ノズル,浸漬ノズル
間の接合部の隙間から大気が吸い込まれ、溶鋼に混入す
るのである。吸い込まれた大気(気泡)は溶鋼と反応し
酸化物を生成して鋳片内に介在物として混在し、或いは
そのまま気泡となって残り、鋳片にピンホールを作る。
特にアルミキルド鋼を鋳造する場合は、溶鋼中に酸化さ
れ易いアルミニウムを多量に含む為、これと反応しアル
ミナを生成し、介在物欠陥が一層顕著となる他、上記浸
漬ノズル内の流れの偏りと相俟って、浸漬ノズル内への
偏在付着を生じ、吐出流の偏りを一層悪化させる。A second problem is to prevent air from being sucked from gaps such as a flow control valve, a flow control nozzle, and an immersion nozzle. In other words, the flow of the molten steel throttled by the flow control valve reaches the rectifying nozzle and the immersion nozzle, so that the cross-sectional area of the flow channel is widened.
Due to this negative pressure, the air is sucked from the gap at the joint between the flow control valve, the rectifying nozzle, and the immersion nozzle, and is mixed into the molten steel. The sucked air (bubbles) reacts with the molten steel to generate oxides, which are mixed as inclusions in the slab or remain as bubbles as they are, thereby forming pinholes in the slab.
Especially when casting aluminum killed steel, molten steel contains a large amount of aluminum that is easily oxidized, so it reacts with this to produce alumina, and inclusion defects become more noticeable. Together with this, uneven distribution adheres to the inside of the immersion nozzle, and the unevenness of the discharge flow is further deteriorated.
【0021】また浸漬ノズル内面へのアルミナ等の付着
がこうじると、遂には浸漬ノズルが閉塞するという問題
を生じる。この様な閉塞は浸漬ノズルの頻繁な交換を必
要とし、メンテナンス作業に負担を強いるものであり、
また操業の自動化を妨げる。Further, when the adhesion of the alumina or the like to the inner surface of the immersion nozzle is reduced, there is a problem that the immersion nozzle is finally closed. Such a blockage requires frequent replacement of the immersion nozzle and imposes a burden on maintenance work.
It also hinders automation of operations.
【0022】またこの様な連続鋳造用注入装置では、長
時間使用しているうちに、タンディッシュから移行した
アルミナ等の耐火物や地金が浸漬ノズル21内部に偏っ
て付着し、それが原因となって、浸漬ノズル21内及び
吐出流の偏流の程度が著しく増大し、従って不均一凝固
が更に悪化するという問題もある。Further, in such a casting apparatus for continuous casting, during use for a long time, refractories such as alumina transferred from the tundish and the base metal adhere to the inside of the immersion nozzle 21 unevenly. As a result, there is a problem that the degree of drift in the immersion nozzle 21 and in the discharge flow is significantly increased, and therefore, uneven solidification is further deteriorated.
【0023】更にこの様なアルミナ等の偏った付着は、
前述の閉塞防止用不活性ガスの流れを乱し、ひいてはピ
ンホールや非金属介在物による欠陥が増大するという問
題がある。Further, such uneven adhesion of alumina or the like is as follows.
There is a problem that the flow of the above-described inert gas for preventing blockage is disturbed, and as a result, defects due to pinholes and nonmetallic inclusions increase.
【0024】第三の課題は、浸漬ノズルからの吐出流を
柔らかく吐出させることである。即ち、吐出流が速く且
つ吐出方向に向けて集中的な流れを形成する場合は、前
述の様に、吐出流の凝固殻衝突部及びその近傍の凝固殻
角部に、Nuの過度な上昇が起こって凝固の進行が遅
れ、その結果凝固が不均一となる。不均一凝固が進んだ
部分の近傍は強度的にも弱く、歪も集中し易くなる為、
割れの発生につながり、最悪の場合にはブレークアウト
を引き起こす。A third problem is to discharge the discharge flow from the immersion nozzle softly. That is, in the case where the discharge flow is fast and forms a concentrated flow in the discharge direction, as described above, the excessive rise of Nu occurs in the solidified shell collision portion of the discharge flow and the solidified shell corner in the vicinity thereof. This slows the progress of coagulation and results in non-uniform coagulation. In the vicinity of the part where heterogeneous solidification has progressed, the strength is also weak, and strain tends to concentrate, so
This can lead to cracking and, in the worst case, breakout.
【0025】特に高速鋳造を行う場合は、溶鋼の吐出流
量が多くなり、従って流速が速くなって、上記割れ等の
問題が重大となる。そこでこの様な割れ等が起こらない
ようにNuの値を十分に低くするには、溶鋼を柔らかく
吐出させることが重要である。In particular, when high-speed casting is performed, the discharge flow rate of molten steel increases, and therefore the flow velocity increases, and the above-mentioned problems such as cracks become serious. Therefore, in order to sufficiently lower the value of Nu so as not to cause such cracks, it is important to discharge molten steel softly.
【0026】しかし例えば上記図15に示す連続鋳造用
注入装置の場合では、段部2で加速された流速が、段部
2以降の浸漬ノズルの部分(図15のFで示す部分)が
短い為に、吐出口15に達するまでに十分に減速され
ず、この速い吐出流が凝固殻界面にあたり、前述の如く
不均一凝固を招く問題となる。段部2の段差を高めると
流れの偏りがより改善されるという面はあるが、それに
伴って吐出流速が更に速くなって、逆に不均一凝固の原
因となる。However, for example, in the case of the casting apparatus for continuous casting shown in FIG. 15, the flow velocity accelerated in the step 2 is short at the part of the immersion nozzle after the step 2 (the part indicated by F in FIG. 15). In addition, the flow is not sufficiently decelerated until reaching the discharge port 15, and this fast discharge flow hits the solidified shell interface, which causes a problem of uneven solidification as described above. Increasing the step in the step 2 has the advantage that the flow deviation is further improved, but the discharge flow velocity further increases with this, and conversely causes uneven solidification.
【0027】更に吐出流が速く凝固殻に衝突した場合は
次の問題を生じる。吐出流がジェット流となって凝固殻
に強く衝突した後の溶鋼流れは、上向き方向の流れと下
向き方向の流れに分流する。上向き方向の流れは溶鋼の
上表面に湧き上がり、該表面を奔走後、浸漬ノズル手前
で潜り込む。この流れに前記吐出偏流が加わると、溶鋼
の上表面の高さレベルが浸漬ノズルを囲む周方向で差を
生じることになり、この差によって溶鋼上表面に渦を生
じる。この渦は、溶鋼表面に浮遊する溶融パウダー(ス
ラグ)を巻き込み、該溶融パウダーが凝固殻に取り込ま
れて介在物欠陥となる。Further, when the discharge flow collides with the solidified shell faster, the following problem occurs. After the discharge flow becomes a jet flow and strongly collides with the solidified shell, the molten steel flow is divided into an upward flow and a downward flow. The upward flow springs to the upper surface of the molten steel, and after running over the surface, sinks in front of the immersion nozzle. When the discharge drift is added to this flow, the height level of the upper surface of the molten steel causes a difference in the circumferential direction surrounding the immersion nozzle, and this difference causes a vortex on the upper surface of the molten steel. This vortex entrains the molten powder (slag) floating on the surface of the molten steel, and the molten powder is taken into the solidified shell and becomes an inclusion defect.
【0028】一方、下向き方向の流れは、タンディッシ
ュから浸漬ノズルを通して鋳型内に持ち込まれた介在物
や気泡を下方に引き込む。下向きの流れの影響が少ない
場合は、介在物や気泡は比重が小さいことによって溶鋼
の上表面へ速やかに移動し、鋳片に混入されることは少
ない。しかしこの様な下向きの流れが強い場合は、下向
きの流れによって下方へ引き込まれた介在物や気泡は、
凝固界面で捕捉され、介在物欠陥やピンホール欠陥とな
る。この問題は曲げ型連続鋳造の場合に特に顕著であ
り、また垂直型連続鋳造の場合にも起こる。On the other hand, the downward flow draws in inclusions and bubbles brought into the mold from the tundish through the immersion nozzle. When the influence of the downward flow is small, the inclusions and bubbles move quickly to the upper surface of the molten steel due to the low specific gravity, and are hardly mixed into the slab. However, when such a downward flow is strong, the inclusions and bubbles drawn downward by the downward flow are
They are trapped at the solidification interface and become inclusion defects and pinhole defects. This problem is particularly pronounced in the case of continuous bending casting and also in the case of vertical continuous casting.
【0029】尚従来においては、上記アルミナ等の付着
や閉塞の防止策として、石灰を富化した材質をコーティ
ングするという対策や、浸漬ノズルの断熱性を高めると
いう対策が提案されているが、上記石灰を用いたコーテ
ィング法では、石灰が侵食された後は急激に閉塞が進行
してしまい、また浸漬ノズルの断熱性を高めるだけでは
アルミナの付着を確実に防止することはできないもので
あった。Conventionally, as a measure for preventing the adhesion or clogging of the alumina or the like, measures such as coating with a lime-enriched material and measures for increasing the heat insulating property of the immersion nozzle have been proposed. In the coating method using lime, clogging progresses rapidly after lime is eroded, and the adhesion of alumina cannot be reliably prevented only by increasing the heat insulating property of the immersion nozzle.
【0030】また上記問題の対策として、従来では注入
装置の吐出口角度(上下方向角度)を変えることによっ
て溶鋼流動を制御し、鋳片表層部の欠陥を防止する試み
もなされてきたが、品質改善の決め手に至っておらず、
また電磁撹拌装置や電磁制動装置を設置して溶鋼流動を
制御する方法も開発されているが、高額な設備費を投入
しなければならないという問題がある。As a countermeasure against the above problem, attempts have been made in the past to control the flow of molten steel by changing the discharge port angle (vertical angle) of the injection device to prevent defects on the surface layer of the slab. It has not reached the decisive factor for improvement,
Although a method of controlling the flow of molten steel by installing an electromagnetic stirrer or an electromagnetic braking device has been developed, there is a problem that expensive equipment costs must be invested.
【0031】そこで本発明においては上記三つの課題に
着目し、鋼の不均一凝固を抑制すると共に、介在物欠陥
やピンホールが存在しない金属鋳片を得ることができ、
またブレークアウトの発生がない安全な連続鋳造用注入
装置を提供することを主要な目的とする。In view of the above, the present invention focuses on the three problems described above, and it is possible to suppress uneven solidification of steel and obtain a metal slab free of inclusion defects and pinholes.
It is another object of the present invention to provide a safe casting apparatus for continuous casting without breakout.
【0032】ところで、操業の自動化を図るには耐火物
交換等のメンテナンス作業を極力軽減することが重要で
あるが、浸漬ノズルを頻繁に交換しなければならない原
因として、上述の浸漬ノズルの閉塞以外に、フラックス
と接触する部分の局所的侵食が挙げられる。即ち浸漬ノ
ズルはフラックスと同じく酸化物を主成分とする材質で
構成されている為、フラックスとの反応によって侵食が
進むからである。従って、たとえ前記主たる目的を達成
し浸漬ノズル内部の閉塞が起こらなくなっても、外側か
らの侵食によって浸漬ノズルの交換の必要が生じる。そ
こで本発明においては、連続鋳造用注入装置の浸漬ノズ
ルのフラックスによる侵食を防止することを第二の目的
とする。In order to automate the operation, it is important to reduce maintenance work such as refractory replacement as much as possible. However, frequent replacement of the immersion nozzle is a cause other than the above-mentioned blockage of the immersion nozzle. For example, there is local erosion of a portion in contact with the flux. That is, since the immersion nozzle is made of a material containing an oxide as a main component similarly to the flux, the erosion proceeds due to the reaction with the flux. Therefore, even if the above-mentioned main purpose is achieved and the inside of the immersion nozzle is not clogged, the erosion from the outside requires replacement of the immersion nozzle. Therefore, a second object of the present invention is to prevent erosion by the flux of the immersion nozzle of the casting apparatus for continuous casting.
【0033】[0033]
【課題を解決するための手段】本発明に係る連続鋳造用
注入装置は、上流に流量調整弁を備え、下流に整流ノズ
ルを介して浸漬ノズルを備え、該浸漬ノズルの吐出口か
ら鋳型内に溶融金属を吐出する連続鋳造用注入装置にお
いて、上記浸漬ノズルにおける溶融金属導入部分に絞り
部(以下、絞り部分と称することがある)を設けると共
に、該浸漬ノズルの絞り部より前記吐出口に至る迄の浸
漬ノズルの部分を流速緩和部とし、上記絞り部の流路横
断面積を上記流量調整弁の全開時の流路横断面積の50
〜90%とし、上記流速緩和部の流路横断面積が前記絞
り部の流路横断面積よりも大きく、該流速緩和部の長さ
が上記絞り部の内径の3倍以上であることを要旨とす
る。The casting apparatus for continuous casting according to the present invention is provided with a flow control valve on the upstream side, a dipping nozzle on the downstream side through a straightening nozzle, and a discharge port of the dipping nozzle into the mold. In the casting apparatus for continuous casting which discharges molten metal, a narrowed portion (hereinafter, sometimes referred to as a narrowed portion) is provided at a molten metal introduction portion of the immersion nozzle, and the immersion nozzle extends from the narrowed portion to the discharge port. The portion of the immersion nozzle up to this is used as a flow rate reducing portion, and the flow passage cross-sectional area of the throttle portion is set to 50 times the flow cross-sectional area when the flow rate control valve is fully opened.
The point is that the flow passage cross-sectional area of the flow velocity relaxation portion is larger than the flow passage cross-sectional area of the restriction portion, and the length of the flow velocity relaxation portion is three times or more the inner diameter of the restriction portion. I do.
【0034】或いは本発明に係る連続鋳造用注入装置
は、上流に流量調整弁と、下流に浸漬ノズルを夫々備
え、該浸漬ノズルの吐出口から鋳型内に溶融金属を吐出
する連続鋳造用注入装置において、流量調整弁より下流
側であって浸漬ノズルより上流側に流路絞り部材を設け
るか、あるいは浸漬ノズルにおける溶融金属導入部分に
絞り部を設け(以下、流路絞り部材と絞り部を、絞り部
分と総称する)、上記絞り部分の流路横断面積が上記流
量調整弁の全開時の流路横断面積の50〜90%であ
り、上記浸漬ノズルの吐出口の形状が、浸漬ノズル内部
から外部に向けて水平方向に広がって、上記吐出口の孔
径が浸漬ノズル内側より外側の方が大きくなったもので
あることを要旨とする。Alternatively, the casting apparatus for continuous casting according to the present invention is provided with a flow control valve upstream and an immersion nozzle downstream, respectively, and discharges molten metal into a mold from a discharge port of the immersion nozzle. In, a flow path restricting member is provided on the downstream side of the flow control valve and on the upstream side of the immersion nozzle, or a restricting section is provided in a molten metal introduction portion of the immersion nozzle (hereinafter, the flow path restricting member and the restricting section, The flow passage cross-sectional area of the throttle portion is 50 to 90% of the flow passage cross-sectional area when the flow rate control valve is fully opened, and the shape of the discharge port of the immersion nozzle is from the inside of the immersion nozzle. The gist of the present invention is that the discharge port is widened in the horizontal direction toward the outside, and the hole diameter of the discharge port is larger on the outside than on the inside of the immersion nozzle.
【0035】もしくは、本発明に係る連続鋳造用注入装
置は、流量調整弁より下流側であって浸漬ノズルより上
流側に流路絞り部材を設けるか、あるいは浸漬ノズルに
おける溶融金属導入部分に絞り部を設けると共に(同じ
く、以下、流路絞り部材と絞り部を、絞り部分と総称す
る)、上記流量調整弁より下流であって上記絞り部分よ
り上流側に湯溜まり部を有し、上記湯溜まり部の流路横
断面積が上記流量調整弁の全開時の流路横断面積の10
0〜250%であり、且つ上記絞り部分の流路横断面積
が上記湯溜まり部の流路横断面積の40〜85%である
ことを要旨とする。更に、上記絞り部分より吐出口に至
る迄の浸漬ノズルの部分を流速緩和部とし、該流速緩和
部の流路横断面積が前記絞り部分の流路横断面積よりも
大きく、該流速緩和部の長さが上記絞り部分の内径の3
倍以上であることが好ましい。Alternatively, the casting apparatus for continuous casting according to the present invention may be provided with a flow path restricting member downstream of the flow rate control valve and upstream of the immersion nozzle, or a restricting portion may be provided at the molten metal introduction portion of the immersion nozzle. (Hereinafter, the flow path restricting member and the restricting portion are collectively referred to as a restricting portion), and a water pool is provided downstream of the flow regulating valve and upstream of the restricting portion. The cross-sectional area of the flow passage is 10% of the cross-sectional area of the flow passage when the flow control valve is fully opened.
The gist is 0 to 250%, and the cross-sectional area of the flow path of the throttle portion is 40 to 85% of the cross-sectional area of the flow path of the pool. Furthermore, a portion of the immersion nozzle from the throttle portion to the discharge port is a flow rate reducing portion, and a flow passage cross-sectional area of the flow speed reducing portion is larger than a flow passage cross-sectional area of the throttle portion, and The inner diameter of the squeezed part is 3
It is preferably at least two times.
【0036】或いは、本発明に係る連続鋳造用注入装置
は、流量調整弁より下流側であって浸漬ノズルより上流
側に流路絞り部材を設けるか、あるいは浸漬ノズルにお
ける溶融金属導入部分に絞り部を設け(同じく、以下、
流路絞り部材と絞り部を、絞り部分と総称する)、上記
流量調整弁より下流であって上記絞り部分より上流側に
湯溜まり部を有し、該湯溜まり部の流路横断面積が上記
流量調整弁の全開時の流路横断面積の100〜250%
であり、且つ上記絞り部分の流路横断面積が上記湯溜ま
り部の流路横断面積の40〜85%であり、上記浸漬ノ
ズルの吐出口の形状が、浸漬ノズル内部から外部に向け
て水平方向に広がって、上記吐出口の孔径が浸漬ノズル
内側より外側の方が大きくなったものであっても良い。Alternatively, the continuous casting pouring device according to the present invention may be provided with a flow path restricting member downstream of the flow control valve and upstream of the immersion nozzle, or a restricting portion may be provided at the molten metal introduction portion of the immersion nozzle. (Same below,
The flow path restricting member and the restricting section are collectively referred to as a restricting section), which has a water pool downstream of the flow rate regulating valve and upstream of the restricting section, and the cross section of the flow path of the water collecting section is 100 to 250% of the flow path cross-sectional area when the flow control valve is fully opened
And the cross-sectional area of the flow passage of the throttle portion is 40 to 85% of the cross-sectional area of the flow passage of the pool, and the shape of the discharge port of the immersion nozzle is horizontal from the inside of the immersion nozzle to the outside. The diameter of the discharge port may be larger on the outside than on the inside of the immersion nozzle.
【0037】加えて、前記絞り部分と前記流速緩和部を
有する前記連続鋳造用注入装置の浸漬ノズル、或いは前
記絞り部分,前記流速緩和部,及び湯溜まり部を有する
前記連続鋳造用注入装置の浸漬ノズルに関し、該浸漬ノ
ズルの吐出口の形状が、浸漬ノズル内部から外部に向け
て水平方向に広がって、上記吐出口の孔径が浸漬ノズル
内側より外側の方が大きくなったものが好ましい。In addition, the immersion nozzle of the continuous casting pouring device having the constricted portion and the flow velocity reducing portion, or the immersion nozzle of the continuous casting pouring device having the restricted portion, the flow velocity relaxing portion, and the water pool portion. Regarding the nozzle, it is preferable that the shape of the discharge port of the immersion nozzle expands in the horizontal direction from the inside of the immersion nozzle to the outside, and the hole diameter of the discharge port is larger on the outside than on the inside of the immersion nozzle.
【0038】更に前記絞り部分が、流路横断面積の小さ
い狭隘部を2以上備えたものであることがより好まし
い。加えて上記流速緩和部の流路横断面積を上記流量調
整弁の全開時の流路横断面積の150%以上とするのが
一層好ましい。Further, it is more preferable that the throttle portion has two or more narrow portions having a small cross-sectional area of the flow path. In addition, it is more preferable that the cross-sectional area of the flow passage of the flow rate reducing portion is set to be 150% or more of the cross-sectional area of the flow passage when the flow regulating valve is fully opened.
【0039】また上記浸漬ノズルの先端部断面を、長軸
が短軸の1.2倍以上の長さである矩形もしくは楕円形
またはこれらの組合せ形状とし、吐出口を上記短軸と平
行な面に設けるのが望ましい。更に上記浸漬ノズルとし
て、吐出口の内部に吐出流を上下に分割する案内部材を
有する様に構成することもできる。The cross section of the tip of the immersion nozzle is rectangular or elliptical whose major axis is at least 1.2 times the minor axis or a combination thereof, and the discharge port is formed in a plane parallel to the minor axis. Is desirably provided. Furthermore, the immersion nozzle may be configured to have a guide member for vertically dividing the discharge flow inside the discharge port.
【0040】また上記浸漬ノズルの、鋳型内のフラック
スに接する外周部に、冷却媒体を循環させる機構を内設
した金属製リングを備えて侵食防止を図る様にすること
が好ましい。It is preferable to provide a metal ring provided with a mechanism for circulating a cooling medium on the outer peripheral portion of the immersion nozzle which is in contact with the flux in the mold so as to prevent erosion.
【0041】[0041]
【発明の実施の形態】先ず前記絞り部分の作用について
説明する。スライドバルブ等の流量調整弁で偏って絞ら
れることにより偏流の生じた溶鋼は、前記絞り部分によ
って周囲から均一に絞られ、中心方向への流れ分力を生
じる。即ち、この絞りは前記偏りを軽減する方向に作用
する。その結果、絞り部分以降の流路横断面積の広い部
分に至った溶鋼は、流路断面に偏りのない流れとなる。
つまり、絞り部分を設けることで、流量調整弁を通過す
ることによって生じた溶鋼の偏流を改善することがで
き、偏りなく溶鋼を吐出することができる。加えて、こ
の偏流の改善は吐出口付近のノズル内壁面剪断応力を非
常に増加させ、従来生じていた吐出口近傍のアルミナ等
の付着が避けられる様になる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the operation of the throttle will be described. The molten steel, which has been deflected by the flow rate regulating valve such as a slide valve, is uniformly throttled from the periphery by the throttle portion, and generates a flow component toward the center. That is, the aperture acts in a direction to reduce the bias. As a result, the molten steel that has reached a portion having a large cross-sectional area of the flow passage after the throttle portion has a flow that is not biased in the cross-section of the flow passage.
That is, by providing the throttle portion, the drift of the molten steel caused by passing through the flow control valve can be improved, and the molten steel can be discharged without bias. In addition, the improvement of the drift greatly increases the shear stress on the inner wall surface of the nozzle near the discharge port, and the adhesion of alumina or the like near the discharge port, which has conventionally occurred, can be avoided.
【0042】更に上記絞り部分は、流量調整弁直下での
過大な負圧の発生を抑えるので、過大な負圧がかかった
時に生じていた隙間からの空気の吸い込みを防止するこ
とができ、従って気泡の混入やアルミナ等の酸化物の発
生を防止することができる。Further, the throttle portion suppresses the generation of an excessive negative pressure immediately below the flow control valve, so that it is possible to prevent air from being sucked from the gap generated when an excessive negative pressure is applied. Incorporation of air bubbles and generation of oxides such as alumina can be prevented.
【0043】次に絞り部分の上流に湯溜まり部を設けた
ものについて説明する。流量調整弁の通過によって強い
偏流を生じた溶鋼は、その下流の湯溜まり部において急
速に横断面積が大きくなることによって遠心方向への流
れ分流を生じて強く撹拌されるので、偏りのない流れと
なってその下流の絞り部分に至り、絞り部分では前述の
様に、均一に溶鋼が絞られて整流される。この様に、絞
り部分の上流に湯溜まり部を設けたものは、その相乗効
果により一層偏りのない流れに溶鋼を整流することがで
きる。Next, a description will be given of a case where a water pool is provided upstream of the throttle portion. Molten steel that caused a strong drift due to the passage of the flow control valve is rapidly agitated because the cross-sectional area increases rapidly in the downstream pool, causing strong flow and agitation. As a result, the molten steel is uniformly squeezed and rectified, as described above. In this way, the one provided with the hot water pool portion upstream of the throttle portion can rectify the molten steel into a more even flow due to the synergistic effect.
【0044】尚、湯溜まり部においては、その流路横断
面積が流量調整弁の全開時と同一もしくはより大きく拡
がるが、その下流に絞り部分があるから、前述の様に負
圧の発生が抑えられ、隙間からの空気の吸い込みは生じ
ない。Although the cross-sectional area of the flow passage in the hot water pool portion is the same as or larger than that when the flow control valve is fully opened, the generation of the negative pressure is suppressed as described above because the throttle portion is located downstream of the flow control valve. Therefore, no air is sucked from the gap.
【0045】次に流速緩和部について説明する。前記流
速緩和部は流路横断面積が大きく長さが長いものである
から、この流速緩和部を設けることによって、上記絞り
部分で速くなった流速を十分に遅くすることができ、そ
の結果、吐出口からの溶鋼流出を緩やかなものとするこ
とができる。Next, the flow rate reducing section will be described. Since the flow velocity relaxing portion has a large flow passage cross-sectional area and a long length, the provision of the flow velocity relaxing portion can sufficiently reduce the flow velocity increased in the throttle portion, and as a result, the discharge port Outflow of molten steel from steel can be moderated.
【0046】流速緩和部の流路横断面積を大きくすれば
するほど溶鋼の流速は遅くなるが、一定の大きさの鋳型
内に挿入される浸漬ノズルの流路横断面積を大きくする
には、自ずと限界がある。加えて浸漬ノズルを大きくす
ることで、鋳型内壁から浸漬ノズル外壁までの間隔をあ
まり狭くすると、そこを通過する溶鋼流の抵抗が増す為
に、通過流速の大幅な減少を招き、その部分での凝固が
促進されることになる。その結果、例えば長方形断面の
鋳片の場合では、鋳片の長辺側と短辺側で凝固成長に不
均一を来す。従って、鋳型内壁から浸漬ノズル外壁まで
の間隔は10mm以上とすることが好ましい。The larger the cross-sectional area of the flow passage in the flow velocity reducing portion, the lower the flow velocity of the molten steel. However, in order to increase the cross-sectional area of the flow passage of the immersion nozzle inserted into a mold having a certain size, it is necessary to increase the cross-sectional area. There is a limit. In addition, if the distance between the inner wall of the mold and the outer wall of the immersion nozzle is made too small by increasing the size of the immersion nozzle, the resistance of the molten steel flow passing therethrough will increase, causing a significant decrease in the flow velocity. Coagulation will be promoted. As a result, for example, in the case of a slab having a rectangular cross section, solidification growth is uneven on the long side and the short side of the slab. Therefore, the distance from the inner wall of the mold to the outer wall of the immersion nozzle is preferably 10 mm or more.
【0047】仮に流速緩和部が円形断面である場合の内
径Dは、下記式(2)を満足することが推奨される。 D≦B−(2t+c) …(2) B:鋳型短片方向の内側幅 t:浸漬ノズルの肉厚 c:間隔を表す一定値(10mm以上)It is recommended that the inner diameter D satisfy the following equation (2) when the flow velocity relaxing portion has a circular cross section. D ≦ B− (2t + c) (2) B: inner width in the direction of the short side of the mold t: thickness of the immersion nozzle c: constant value representing the interval (10 mm or more)
【0048】また、吐出口近傍はアルミナ等の付着が元
来起こりやすい部分であるが、流速緩和部の長さが短い
場合では、上記アルミナ等の付着によって絞り部の直下
が埋まりやすくなり、絞り部から流速緩和部にかけて流
路横断面積が拡大するという形状が維持できず、その結
果、吐出流速の低減効果が劣る様になるという問題があ
る。In the vicinity of the discharge port, the adhesion of alumina or the like is originally likely to occur. However, if the length of the flow velocity reducing portion is short, the adhesion of the alumina or the like makes it easy to fill the area immediately below the narrowed portion, and There is a problem that the shape in which the cross-sectional area of the flow path increases from the portion to the flow rate reducing portion cannot be maintained, and as a result, the effect of reducing the discharge flow rate becomes inferior.
【0049】しかし、本発明の流速緩和部の様に長さを
十分に長くした場合では、絞り部直下に付着が発生し難
く、絞り部から流速緩和部にかけて流路横断面積が拡大
する形状を長期に持続することが可能となる。However, when the length is sufficiently long as in the flow rate reducing portion of the present invention, it is difficult for the adhesion to occur immediately below the throttle portion, and the cross-sectional area of the flow channel increases from the throttle portion to the flow rate reducing portion. It is possible to last for a long time.
【0050】次に浸漬ノズルの吐出口の形状について説
明する。浸漬ノズルの吐出口を、浸漬ノズル内部から外
部に向けて水平方向に広がり、浸漬ノズル内側の吐出口
孔径より浸漬ノズル外側の吐出口孔径が大きくなった形
状とすることで、吐出流を緩流化することができる。即
ち、吐出口が内部から外部に向けて広がる形状の場合
は、吐出流がその形状に沿って順次広がる為、全体とし
て緩流化する。加えて吐出直後の溶鋼の一部は吐出口出
側の拡大面に沿って流れるので、スラブ鋳型の狭い側の
凝固殻にも適度に緩流化した溶鋼が当たり、凝固界面を
適度にクリーニングすることができる。Next, the shape of the discharge port of the immersion nozzle will be described. The discharge port of the immersion nozzle expands horizontally from the inside of the immersion nozzle to the outside, and the discharge port outside the immersion nozzle is larger than the discharge port inside the immersion nozzle. Can be That is, when the discharge port has a shape that spreads from the inside to the outside, the discharge flow is gradually widened along the shape, so that the flow becomes slow as a whole. In addition, part of the molten steel immediately after discharge flows along the enlarged surface on the outlet side of the discharge port, so the moderately moderated molten steel also hits the solidified shell on the narrow side of the slab mold and cleans the solidified interface appropriately. be able to.
【0051】この様な吐出流の緩流化によって、凝固界
面での再溶融がなくなり、また溶鋼流を均一化でき、従
って部分的な凝固遅れを消滅させることができ、均一な
凝固成長をさせることができる。By slowing the discharge flow, remelting at the solidification interface is eliminated, and the molten steel flow can be made uniform, so that a partial solidification delay can be eliminated and uniform solidification growth can be achieved. be able to.
【0052】推奨される連続鋳造用注入装置としては、
本発明の主要ポイントである前記湯溜まり部,前記絞り
部分,流速緩和部及び上記水平方向に広がる形状の吐出
口の全てを持つものでる。即ち上述の様に流速緩和部の
作用のみによる吐出流の低速化の限界を、上記水平方向
に広がる形状の吐出口を採用することで克服するもので
あり、従ってより一層の吐出流の緩流化が実現でき、均
一に凝固した鋳片を得ることができる。The recommended casting apparatus for continuous casting is:
The main point of the present invention is to have all of the hot water pool, the throttle, the flow rate reducing portion, and the discharge port having the shape expanding in the horizontal direction. That is, as described above, the limitation of the lowering of the discharge flow due to only the action of the flow velocity reducing portion is overcome by adopting the discharge port having the shape spreading in the horizontal direction. Can be realized, and a cast solidified uniformly can be obtained.
【0053】また吐出流が十分に緩流化されていること
により、吐出口を上向きにすることが可能となる。即
ち、上記上向きの吐出口から出た溶鋼流は十分に緩流化
されているから、鋳型内溶鋼の上表面では流速が十分に
減少しており、加えて上記絞り部分の作用によって流れ
に偏りがないから、溶鋼の上表面において渦或いは潜り
込みが発生することがなく、従って溶鋼表面に浮遊する
溶融パウダーを巻き込むこともない為、上向きの吐出口
が可能となる。Further, since the discharge flow is sufficiently slowed, the discharge port can be directed upward. That is, since the molten steel flow from the upward discharge port is sufficiently slowed, the flow velocity is sufficiently reduced on the upper surface of the molten steel in the mold, and in addition, the flow is biased by the action of the throttle portion. Since there is no molten steel, no vortex or sneak-through occurs on the upper surface of the molten steel, and therefore no molten powder floating on the surface of the molten steel is involved, so that an upward discharge port can be provided.
【0054】この様に、上向きの吐出口とすることで、
吐出溶鋼が高温のまま鋳型内の溶鋼上表面に到達する
が、そのことによって鋳型内に持込まれる介在物全量を
メニスカス上のモールドパウダーに接触させることがで
き、介在物成績の一段の向上を図ることができる。As described above, by making the ejection port upward,
The discharged molten steel reaches the upper surface of the molten steel in the mold at a high temperature, which allows the entire amount of inclusions brought into the mold to contact the mold powder on the meniscus, further improving the performance of inclusions be able to.
【0055】以上の様に偏りのない緩やかな吐出流によ
って凝固界面の溶鋼流れを均一化できる結果、均一な凝
固成長が図られるばかりでなく、上述の様に吐出流の凝
固界面衝突防止、溶鋼上表面の温度上昇、溶鋼上表面の
流れの低速化等によって、鋳型内界面における介在物や
気泡の取り込みを抑止することができる。As described above, the molten steel flow at the solidification interface can be made uniform by the gentle discharge flow without bias, so that not only uniform solidification growth can be achieved, but also the solidification interface of the discharge flow can be prevented as described above, Inclusion of inclusions and air bubbles at the interface in the mold can be suppressed by increasing the temperature of the upper surface, slowing the flow on the upper surface of the molten steel, and the like.
【0056】以下に具体例を挙げて、更に詳細に本発明
を説明する。 <具体例1>図1は本発明の具体例1に係る連続鋳造用
注入装置を示す図である。尚同図において、図14と同
じ構成部分については同一符号を付して重複説明を避け
る。整流ノズル3に続く浸漬ノズル11の溶鋼導入部分
内側には、絞り部12が設けられている。上記浸漬ノズ
ル11の内側には絞り部12を係止するためのテーパが
設けられ、絞り部12が浸漬ノズル11内に安定的に設
置される。Hereinafter, the present invention will be described in more detail with reference to specific examples. <Example 1> FIG. 1 is a view showing an injection apparatus for continuous casting according to Example 1 of the present invention. 14, the same components as those in FIG. 14 are denoted by the same reference numerals, and redundant description will be omitted. A throttle part 12 is provided inside the molten steel introduction part of the immersion nozzle 11 following the rectifying nozzle 3. The inside of the immersion nozzle 11 is provided with a taper for locking the squeezed portion 12, and the squeezed portion 12 is stably installed in the immersion nozzle 11.
【0057】インサートノズル5から導入された溶鋼は
スライドバルブ(流量調整弁)4で流量が調節され、整
流ノズル3で整流される。そして絞り部12で絞られ、
いったん流速が高められるが、絞り部12よりも流路横
断面積の大きい浸漬ノズル11の流速緩和部16へ入っ
て流速が徐々に緩和されて、吐出口15からは所望の穏
やかな吐出流速をもって鋳型(図示せず)内へ供給され
る。The flow rate of the molten steel introduced from the insert nozzle 5 is adjusted by a slide valve (flow rate adjusting valve) 4 and rectified by a rectifying nozzle 3. And it is squeezed by the squeezing section 12,
Once the flow velocity is increased, it enters the flow velocity reduction section 16 of the immersion nozzle 11 having a larger flow passage cross-sectional area than the throttle section 12, and the flow velocity is gradually reduced. (Not shown).
【0058】尚、本発明においては具体例1の様にスラ
イドバルブ4の下流に整流ノズル3を設けたものや、下
述の具体例2の様に湯溜まり部を設けたものに限らず、
これら整流ノズル3等を設けない連続鋳造用注入装置も
本発明に包含される。即ち例えばスライドバルブ4から
直接浸漬ノズル11を接続する様にしても良い。The present invention is not limited to the one in which the rectifying nozzle 3 is provided downstream of the slide valve 4 as in the first embodiment, or the one in which the water pool is provided as in the second embodiment described below.
The casting apparatus for continuous casting without the rectifying nozzle 3 and the like is also included in the present invention. That is, for example, the immersion nozzle 11 may be directly connected from the slide valve 4.
【0059】通常の連続鋳造では、スライドバルブ4の
流路横断面積は全開時の30%ないし70%の開度で操
業されていることが多く、この様な操業の条件下におい
て絞り部12がない場合は、前述の様に、スライドバル
ブ4で流路が絞られた後、急激に拡大したことによる静
圧の低下と、鋳型内の溶融金属湯面よりも位置エネルギ
ーが高いことによる静圧の低下が重なって、負圧(vs
大気圧)が発生する。しかし本具体例1の様に絞り部1
2を設けることでこの負圧が軽減される。In the ordinary continuous casting, the slide valve 4 is often operated with the cross-sectional area of the flow passage being 30% to 70% of the opening degree at the time of full opening. If not, as described above, after the flow path is narrowed by the slide valve 4, the static pressure decreases due to rapid expansion, and the static pressure decreases due to the higher potential energy than the molten metal surface in the mold. And the negative pressure (vs.
Atmospheric pressure). However, as in the first specific example,
By providing 2, the negative pressure is reduced.
【0060】負圧軽減の方策の一つとして、整流ノズル
3以降の流路径を一律に縮小することも考えられるが、
こうした場合は吐出流速が速くなるという別の問題が生
じる。As one of the measures for reducing the negative pressure, it is conceivable to uniformly reduce the diameter of the flow path after the rectifying nozzle 3.
In such a case, there is another problem that the discharge flow rate is increased.
【0061】本具体例1では、スライドバルブ4の下流
に絞り部12を設けているから、絞り部12の上流側の
負圧を軽減できると共に、絞り部12の下流には十分太
くて長い流速緩和部16を設けているから、ここで吐出
流速を十分に低減することができる。この際、絞り部1
2の流路横断面積Iがあまり大きすぎると偏流防止や負
圧軽減の効果が小さくなり、逆にあまり強く絞りすぎる
とスライドバルブ4による流量制御が効かなくなるとい
う問題があるため、絞り部12の流路横断面積Iはスラ
イドバルブ4の操業中の流路横断面積Gより若干大きく
する必要がある。即ちスライドバルブ4の全開時の流路
横断面積Gの50%ないし90%とするのが良い。In the first embodiment, since the throttle portion 12 is provided downstream of the slide valve 4, the negative pressure on the upstream side of the throttle portion 12 can be reduced, and a sufficiently thick and long flow velocity is provided downstream of the throttle portion 12. Since the relief portion 16 is provided, the discharge flow velocity can be sufficiently reduced here. At this time, the throttle unit 1
If the cross-sectional area I of the flow path 2 is too large, the effect of preventing drifting and reducing the negative pressure is reduced. Conversely, if the flow is controlled too strongly, the flow control by the slide valve 4 becomes ineffective. The flow path cross-sectional area I needs to be slightly larger than the flow path cross-sectional area G during operation of the slide valve 4. That is, the flow path cross-sectional area G when the slide valve 4 is fully opened is preferably 50% to 90%.
【0062】そして流速緩和部16の流路横断面積Hが
絞り部12の流路横断面積Iよりも大きいことにより、
絞り部12で速くなった流速が流速緩和部16で遅くな
る。流速緩和効果をより高めるためには、スライドバル
ブ4の全開時の流路横断面積Gの150%以上の大きさ
にすることが望ましい。尚、流速緩和部16の流路横断
面積Hの上限については、鋳型内壁から浸漬ノズル外壁
までの間隔にある程度の余裕(10mm以上)をもたせ
たものが良く、浸漬ノズル11(流速緩和部16)が円
筒形の場合は前記式(2)を満足することが望まれる。Since the cross-sectional area H of the flow path of the flow velocity reducing section 16 is larger than the cross-sectional area I of the flow path of the throttle section 12,
The flow velocity that has been increased in the throttle section 12 is reduced in the flow velocity relaxation section 16. In order to further enhance the flow velocity relaxing effect, it is desirable to set the size to 150% or more of the flow path cross-sectional area G when the slide valve 4 is fully opened. In addition, as for the upper limit of the flow passage cross-sectional area H of the flow velocity reducing portion 16, it is preferable that a space from the inner wall of the mold to the outer wall of the immersion nozzle has a certain margin (10 mm or more). When is a cylindrical shape, it is desired that the above expression (2) be satisfied.
【0063】また溶鋼の流速を十分に緩和させるために
は、流速緩和部16の距離Jは絞り部12の内径の3倍
以上であることが必要であり、更に流速をより完全に緩
和させるためには、5倍以上であることが望ましい。Further, in order to sufficiently reduce the flow velocity of the molten steel, the distance J of the flow velocity reducing portion 16 needs to be at least three times the inner diameter of the narrowed portion 12, and in order to further reduce the flow velocity more completely. Is preferably 5 times or more.
【0064】<具体例2>図2は本発明の具体例2に係
る連続鋳造用注入装置を示す図である。尚同図におい
て、図1と同じ構成部分については同一符号を付して重
複説明を避ける。湯溜まり部13は、スライドバルブ4
の下流であって絞り部12の上流側に設けられている。<Embodiment 2> FIG. 2 is a view showing a continuous casting pouring apparatus according to Embodiment 2 of the present invention. In the figure, the same components as those in FIG. The water pool 13 is provided with the slide valve 4
And on the upstream side of the throttle unit 12.
【0065】インサートノズル5から導入された溶鋼は
スライドバルブ(流量調整弁)4で流量が調節され、ス
ライドバルブ4の全開時と等しい若しくはそれより大き
い流路を持つ湯溜まり部13で撹拌される。そして前記
具体例1と同様に、絞り部12で絞られ、いったん流速
が高められ、次に絞り部12よりも流路横断面積の大き
い浸漬ノズル11の流速緩和部16へ入って流速が徐々
に緩和されて、吐出口15からは所望の穏やかな吐出流
速をもって鋳型(図示せず)内へ供給される。The flow rate of the molten steel introduced from the insert nozzle 5 is adjusted by a slide valve (flow control valve) 4, and the molten steel is stirred in a pool 13 having a flow path equal to or larger than that when the slide valve 4 is fully opened. . Then, in the same manner as in the specific example 1, the flow is narrowed by the throttle unit 12, the flow velocity is once increased, and then the flow enters the flow velocity reduction unit 16 of the immersion nozzle 11 having a larger flow passage cross-sectional area than the throttle unit 12, and the flow velocity gradually increases. After being relaxed, the liquid is supplied from the discharge port 15 into a mold (not shown) at a desired gentle discharge flow rate.
【0066】本具体例2では、前述の様に湯溜まり部1
3と絞り部12によって整流でき、前記具体例1と同様
に、絞り部12の上流側の負圧を低減できると共に、流
速緩和部16によって流速を緩和させて緩やかに溶鋼を
吐出することができる。In the present specific example 2, the water pool 1
3 and the throttle portion 12, the negative pressure on the upstream side of the throttle portion 12 can be reduced, and the molten steel can be discharged gently by relaxing the flow velocity by the flow velocity relaxing part 16, similarly to the first embodiment. .
【0067】この際、スライドバルブ4,湯溜まり部1
3,絞り部12の流路断面積を適切に設定することが必
要である。湯溜まり部13の流路横断面積Nに関して
は、あまり小さすぎると、湯溜まり部での撹拌が少なく
なり、また絞り部との相乗効果による整流効果が小さく
なる。逆に流路横断面積Nがあまり大きいと、湯溜まり
部において偏った流れによってアルミナ付着を生じ易い
という問題がある。また絞り部12の流路断面積Iは、
前述と同様に、大きいと偏流防止や負圧軽減の効果が小
さくなり、小さいとスライドバルブ4による流量制御が
効かなくなる。At this time, the slide valve 4, the pool 1
3. It is necessary to appropriately set the flow path cross-sectional area of the throttle unit 12. If the flow passage cross-sectional area N of the pool 13 is too small, the stirring at the pool is reduced, and the rectifying effect due to the synergistic effect with the throttle is reduced. Conversely, if the flow passage cross-sectional area N is too large, there is a problem in that alumina is likely to adhere to the pool due to the uneven flow in the pool. The flow path cross-sectional area I of the throttle unit 12 is
As described above, if it is large, the effect of preventing drifting and reducing negative pressure will be small, and if it is small, the flow control by the slide valve 4 will not be effective.
【0068】そこでこれらの問題を避け本発明の作用効
果を発揮させる為には、湯溜まり部13の流路横断面積
Nをスライドバルブの全開時の流路横断面積の100〜
250%とし、絞り部12の流路横断面積Iを湯溜まり
部13の流路横断面積Nの40〜85%とするのが良
い。尚、流速緩和部16については、前記具体例1の場
合と同様の大きさが推奨され、同様の作用効果を発揮す
る。Therefore, in order to avoid these problems and to exert the effect of the present invention, the flow passage cross-sectional area N of the pool 13 is set to 100 to 100 times of the flow passage cross-sectional area when the slide valve is fully opened.
It is preferable that the flow passage cross-sectional area I of the narrowed portion 12 is set to 40% to 85% of the flow passage cross-sectional area N of the pool 13. In addition, as for the flow velocity relaxing portion 16, the same size as that of the specific example 1 is recommended, and the same operation and effect are exhibited.
【0069】前記具体例1,2の様に緩やかな吐出流を
実現した連続鋳造用注入装置においては、その吐出口を
上向きにしても、湯面上のフラックスを巻き込むという
心配がなくなるから、吐出口角度を上向きに構成するこ
ともできて、この様に上向きにする対策を施すことで、
更にピンホール等の鋳片欠陥を少なくすることができ
る。In the casting apparatus for continuous casting which realizes a gradual discharge flow as in the specific examples 1 and 2, even if the discharge port is directed upward, there is no fear that the flux on the molten metal surface is caught. The exit angle can be configured to be upward, and by taking measures to make it upward like this,
Furthermore, it is possible to reduce slab defects such as pinholes.
【0070】尚、絞り部12は図1に示す様に浸漬ノズ
ル11との取り外しが可能なセパレート構造としても良
いし、あるいは下述の図5の様に、絞り部12と浸漬ノ
ズル11とを一体とした構造とすることも可能である。The throttle unit 12 may have a separate structure that can be detached from the immersion nozzle 11 as shown in FIG. 1, or the throttle unit 12 and the immersion nozzle 11 may be connected as shown in FIG. An integrated structure is also possible.
【0071】また絞り部12の設置には図1の様なテー
パを設ける方法に限らず、段差を設けて設置する様にし
ても良く、種々の方法がある。設置位置についても、図
1に示す様に浸漬ノズル11の溶鋼導入部端部に限ら
ず、その近傍であれば若干下流側へ下っていても良い。Further, the installation of the aperture portion 12 is not limited to the method of providing a taper as shown in FIG. 1, but may be provided with a step, and there are various methods. The installation position is not limited to the end of the molten steel introduction portion of the immersion nozzle 11 as shown in FIG. 1, but may be slightly downstream as long as it is in the vicinity.
【0072】<具体例3〜5>図3は本発明の具体例3
に係る連続鋳造用注入装置の絞り部22を示す断面図で
ある。本発明における絞り部は、図1,2に示す様に内
側が平らなものに限定されず、図3に示す様に絞り部2
2の内側に段差を設けたものであっても良い。スライド
バルブ4の下流近傍に発生する負圧の軽減は、絞り部2
2の絞り凸部(狭隘部)21によってなされ、凹部23
によって流速の緩和がなされる。<Embodiments 3 to 5> FIG. 3 shows Embodiment 3 of the present invention.
It is sectional drawing which shows the drawing part 22 of the casting apparatus for continuous casting which concerns on FIG. The squeezed portion in the present invention is not limited to a squeezed portion as shown in FIGS.
A step may be provided inside 2. Reduction of the negative pressure generated near the downstream of the slide valve 4
2 is formed by a convex part (narrow part) 21 of the diaphragm, and a concave part 23
This alleviates the flow velocity.
【0073】この様に本具体例3では、絞りの効果を発
揮する絞り凸部21の長さMを短いものとして絞り効果
が若干低下した分、絞りの効果を更に高めるために絞り
凸部21を複数としている。従ってその凸部21同士の
間に凹部23を設けたとしても、絞り部22全体の長さ
はあまり長くならず、それにより絞り部22下流に十分
な長さを持った流速緩和部を設けることができる。As described above, in the third embodiment, the length of the stop projection 21 which exerts the effect of the stop is made shorter, and the stop effect is slightly reduced. Is a plurality. Therefore, even if the concave portion 23 is provided between the convex portions 21, the entire length of the throttle portion 22 does not become too long, so that a flow velocity reducing portion having a sufficient length is provided downstream of the throttle portion 22. Can be.
【0074】図4は具体例4に係る連続鋳造用注入装置
の浸漬ノズルを示す断面図であり、浸漬ノズル11の溶
鋼導入部分内側に絞り部32が設けられており、複数の
絞り凸部(狭隘部)31はテーパとなっている。図5は
具体例5に係る連続鋳造用注入装置の浸漬ノズル41を
示す断面図であり、この浸漬ノズル41は絞り部分が浸
漬ノズルと一体となったものである。FIG. 4 is a sectional view showing an immersion nozzle of the continuous casting pouring apparatus according to the fourth embodiment. The immersion nozzle 11 is provided with a squeezed portion 32 inside the molten steel introduction portion. The narrow portion 31 is tapered. FIG. 5 is a cross-sectional view showing an immersion nozzle 41 of the continuous casting pouring apparatus according to the fifth embodiment. The immersion nozzle 41 has a throttle portion integrated with the immersion nozzle.
【0075】絞り凸部21,31は、図3や図4に示す
様に、2〜3か所に限るものではなく、何か所でも良
い。更に絞り部の長さを単に長くするよりも、短い絞り
凸部を複数設けた方が、絞りの効果が大きいことを確認
している。The aperture projections 21 and 31 are not limited to two or three as shown in FIGS. 3 and 4, but may be any number. Further, it has been confirmed that the effect of the aperture is greater when a plurality of short aperture protrusions are provided than when the length of the aperture is simply increased.
【0076】絞り部分の形状は、図3,4,5に示す以
外にも、種々変更が可能であるが、絞り部分が溶鋼の偏
流を改善する効果を発揮するには、ノズル内径,狭隘部
の高さ,狭隘部の数,加えて流速緩和部の長さが影響す
る為、最も推奨される連続鋳造用注入装置は下記式
(3)〜(6)を満足するものである。尚、下記式にお
いて、w:浸漬ノズルの溶鋼導入部分(入り口部分)の
内径、h:絞り部分における凹部に対する狭隘部(絞り
凸部)の高さ、s:絞り部分の狭隘部の間隔、x:狭隘
部の段数であり、図5の該当する部分に夫々記号を記載
している。 8≦w/h≦30 …(3) 1≦s/h≦5 …(4) 0.6≦s/w≦1 …(5) x≧2 …(6)The shape of the constricted portion can be variously changed in addition to those shown in FIGS. 3, 4, and 5. However, in order for the constricted portion to exhibit the effect of improving the drift of the molten steel, the inner diameter of the nozzle and the confined portion must be reduced. Since the height, the number of narrow portions, and the length of the flow rate reducing portion are affected, the most recommended casting apparatus for continuous casting satisfies the following equations (3) to (6). In the following formula, w: the inner diameter of the molten steel introduction part (entrance part) of the immersion nozzle, h: the height of the narrow part (restriction convex part) with respect to the concave part in the restriction part, s: the interval between the narrow parts of the restriction part, x : The number of steps in the narrow portion, and the corresponding symbols in FIG. 5 are described. 8 ≦ w / h ≦ 30 (3) 1 ≦ s / h ≦ 5 (4) 0.6 ≦ s / w ≦ 1 (5) x ≧ 2 (6)
【0077】複数の狭隘部(x:凸部)を有する絞り部
分の場合は、流量調整弁で生じた偏りのある流れは、複
数の凸部と凹部によって何度もかき混ぜられることによ
って分散され、その結果流速緩和部に至った時点の流れ
には偏りがなくなるから絞り効果が大きく現れるのであ
る。従って2以上の狭隘部を備えることが特に推奨され
る(式(6))。In the case of a throttle portion having a plurality of narrow portions (x: convex portions), the uneven flow generated by the flow control valve is dispersed by being stirred many times by the plurality of convex portions and concave portions, and is dispersed. As a result, the flow at the time when the flow reaches the flow velocity alleviating portion is not biased, so that the throttle effect is greatly exhibited. Therefore, it is particularly recommended to provide two or more narrow portions (Equation (6)).
【0078】wは60〜100mmのものが一般に使用
されているが、wに対しhが大きい場合は溶鋼流れの抵
抗が大きくなり、前述の様な流量調整弁による流量制御
が効かなくなるという問題があり、一方hが小さい場合
は絞り効果が不十分となる。従って上記式(3)を満足
するものが好ましい。またsが小さい場合や大きい場合
は、狭隘部を複数設けたことによる上述のかき混ぜ効果
が発揮されない為、上記式(5)を満足することが望ま
しい。また式(4)についても、上述の様に、hやsが
大きい或は小さい場合の不具合から、上記式(4)を満
足するものが好まれる。Although w having a width of 60 to 100 mm is generally used, if h is larger than w, the resistance of the flow of molten steel increases, and the flow control by the flow control valve as described above becomes ineffective. On the other hand, when h is small, the aperture effect becomes insufficient. Therefore, those satisfying the above expression (3) are preferable. When s is small or large, the above-described stirring effect due to the provision of the plurality of narrow portions is not exhibited, and therefore it is desirable to satisfy the above expression (5). As for the equation (4), as described above, the one satisfying the above equation (4) is preferable because of the disadvantages when h and s are large or small.
【0079】<具体例6(参考例)> 図6は本発明の具体例6(参考例)に係る連続鋳造用注
入装置を示す図であり、同図中、図1と同じ構成部分に
ついては同一符号を付して重複説明を避ける。流路絞り
部材42が、スライドバルブ4より下流側で、浸漬ノズ
ル11より上流側に設けてあり、該流路絞り部材42は
あたかも整流ノズルと絞りを一体とした構造となってい
る。本具体例6(参考例)は前記具体例1,2の様に絞
り部分を浸漬ノズル内に配置するのではなく、浸漬ノズ
ルより上流に配置する構造としたものである。<Specific Example 6 (Reference Example)> FIG. 6 is a view showing a continuous casting injection apparatus according to a specific example 6 (reference example) of the present invention. In FIG. The same reference numerals are given to avoid duplicate description. A flow path restricting member 42 is provided on the downstream side of the slide valve 4 and on the upstream side of the immersion nozzle 11, and the flow path restricting member 42 has a structure in which a rectifying nozzle and a restrictor are integrated. The specific example 6 (reference example) has a structure in which the throttle portion is not disposed in the immersion nozzle as in the specific examples 1 and 2, but is disposed upstream of the immersion nozzle.
【0080】この場合には流路絞り部材42と浸漬ノズ
ル11の結合部48を十分に密着させ、流路絞り部材4
2の下流に発生する負圧による空気の吸い込みを防止す
る必要があり、シール性の高いことが望まれる。しか
し、流路絞り部材42の下流に発生する負圧は、流路絞
り部材42がスライドバルブ4の操業中の流路横断面積
Gより若干大きいこと、及び溶鋼の湯面から余り離れず
落差が少ないことから、閉塞を起こすほどの著しい負圧
ではなく、軽度のものである。この具体例6(参考例)
でも前述と同様に、スライドバルブ4の下流近傍に発生
する負圧を軽減し、閉塞防止効果を発揮する。In this case, the connecting portion 48 between the flow path restricting member 42 and the immersion nozzle 11 is sufficiently brought into close contact, and the flow path restricting member 4
It is necessary to prevent the suction of air due to the negative pressure generated downstream of 2, and a high sealing property is desired. However, the negative pressure generated downstream of the flow passage restricting member 42 is such that the flow passage restricting member 42 is slightly larger than the flow passage cross-sectional area G during the operation of the slide valve 4, and the head is not separated from the molten steel surface so that the negative pressure is reduced. Because of the small amount, the pressure is not so severe as to cause occlusion, but is mild. Specific Example 6 (Reference Example)
However, in the same manner as described above, the negative pressure generated near the downstream of the slide valve 4 is reduced, and the blocking effect is exhibited.
【0081】<具体例7>図7の(a)は本発明の具体
例7に係る連続鋳造用注入装置の浸漬ノズル81を示す
縦断面図で、図7の(b)はそのf−f線での横断面図
である。本具体例7においては、図7(b)に示す様
に、吐出口85がαy の角度で浸漬ノズル81内部から
外部に向けて広がっており、他の部分については上記具
体例5と同様に絞り部分82及び流速緩和部16が設け
られている。この様に吐出口85を水平方向に末広がり
の形状とすることで、吐出流が、図7に示すX方向だけ
でなく、Y方向にも広がり、より緩流化する。<Embodiment 7> FIG. 7A is a longitudinal sectional view showing an immersion nozzle 81 of a continuous casting pouring apparatus according to Embodiment 7 of the present invention, and FIG. FIG. 4 is a cross-sectional view taken along a line. In this example 7, as shown in FIG. 7 (b), it has spread discharge opening 85 from the inside toward the outside immersion nozzle 81 at an angle alpha y, similarly to the embodiment 5 for the other parts The throttle portion 82 and the flow velocity alleviating portion 16 are provided. By forming the discharge port 85 so as to be widened in the horizontal direction, the discharge flow spreads not only in the X direction shown in FIG. 7 but also in the Y direction, and becomes more gentle.
【0082】本具体例7においては、絞り部,流速緩和
部,吐出口形状について、本発明の各条件を満足・具備
しており、最も推奨される連続鋳造用注入装置の一つで
ある。即ち流速緩和部16で流速が遅くなった溶鋼流
を、吐出口85から更におだやかに吐出することがで
き、且つ絞り部分82によって流れに偏りが改善されて
いるから、均一に凝固した良好な鋳片を製造することが
できる。In Example 7, the narrowing section, the flow rate reducing section, and the shape of the discharge port satisfy and satisfy the respective conditions of the present invention, and are one of the most recommended continuous casting injection apparatuses. That is, the molten steel flow whose flow velocity has been slowed down by the flow velocity relaxation section 16 can be more gentlely discharged from the discharge port 85, and the unevenness of the flow is improved by the throttle portion 82. Pieces can be manufactured.
【0083】次に浸漬ノズルの付着物厚みの実験につい
て述べる。種々の組成の溶鋼を用いて鋳造を行なったと
きの、流速緩和部の内壁に付着する付着物の厚みを測定
した。実験は具体例7の浸漬ノズル及び従来(図14参
照)の浸漬ノズルについて行なった。Next, an experiment on the thickness of the deposit on the immersion nozzle will be described. When casting was performed using molten steels of various compositions, the thickness of the deposits adhering to the inner wall of the flow velocity reducing portion was measured. The experiment was performed on the immersion nozzle of Example 7 and the conventional immersion nozzle (see FIG. 14).
【0084】その結果をプロットしたグラフが図19で
ある。図19に示す各プロット(○)は夫々異なる溶鋼
種を用いたときの実験結果を示すものであり、例えばプ
ロットβは、ある種類の鋼を鋳造したときに、従来の浸
漬ノズルでは付着物が23mm厚まで成長したが、具体
例7の浸漬ノズルでは付着物が12mmで止まっていた
ことを示す。この説明から分かる様に直線A上にプロッ
トがある場合は、従来ノズルと具体例7とで付着物量に
差がなかったことを示し、直線Aよりも下方にプロット
がある場合は、従来ノズルよりも具体例7の方が付着物
が少ないことを表している。図19から分かる様に、ほ
とんどの鋼種について具体例7の浸漬ノズルの方が付着
物が付きにくく、優れた結果が得られている。FIG. 19 is a graph plotting the results. Each plot (○) shown in FIG. 19 shows an experimental result when a different type of molten steel was used. For example, plot β shows that when a certain type of steel was cast, a deposit was found with a conventional immersion nozzle. Although it grew to a thickness of 23 mm, the immersion nozzle of Example 7 showed that the deposit stopped at 12 mm. As can be understood from this description, when there is a plot on the straight line A, it indicates that there is no difference in the amount of deposits between the conventional nozzle and the specific example 7, and when there is a plot below the straight line A, it is more than the conventional nozzle. This also indicates that Example 7 has less attached matter. As can be seen from FIG. 19, for most steel types, the immersion nozzle of Example 7 is less likely to adhere, and excellent results are obtained.
【0085】<具体例8>図8の(a)は本発明の具体
例8に係る連続鋳造用注入装置の浸漬ノズル91を示す
縦断面図で、図8の(b)はそのg−g線での横断面図
である。本具体例8は、具体例7に一層の改良を加えた
もので、末広がりの吐出口95がαz の角度で上向きに
開口したものである。この様に吐出口を上向きとするこ
とで、前記説明した様に更に良好な鋳片を製造できる。<Embodiment 8> FIG. 8A is a longitudinal sectional view showing an immersion nozzle 91 of a continuous casting pouring apparatus according to Embodiment 8 of the present invention, and FIG. FIG. 4 is a cross-sectional view taken along a line. This example 8, plus the further improvement in the specific examples 7, in which the flared discharge opening 95 is open upward at an angle of alpha z. By setting the discharge port upward in this way, a better cast piece can be manufactured as described above.
【0086】吐出口95からの吐出流のX方向,Y方
向,Z方向の最大吐出流速を夫々Vx,Vy ,Vz とし
た場合、X−Y平面において総合した吐出流速[(Vx 2
+Vy 2)の平方根]は0.7m/sec.以下が望ましく、X
−Z平面において総合した吐出流速[(Vx 2+Vz 2)の
平方根]は1.2m/sec.以下が望ましい。また、吐出口
角度が上向きであり過ぎると、鋳造操業において鋳型内
へ溶湯を入れ始める際に、鋳型から溶鋼が吹き出し火花
が散るといった危険があり、一方吐出口が下向き過ぎる
と介在物や気泡を下方へ引き込むことになり好ましくな
い。従ってこの様な問題を起こさない様にし、また上記
吐出流速を達成するには吐出角度を10゜≦αy ≦90
゜、−35゜≦αz ≦35゜とするのが良い(図7,図
8参照)。[0086] X direction of the discharge flow from the discharge port 95, Y-direction, the maximum discharge flow rate respectively V x in the Z direction, V y, when the V z, the discharge flow rate [(V x obtained by integrating in the X-Y plane Two
+ V y 2 ) is preferably 0.7 m / sec or less.
-Z [square root of (V x 2 + V z 2 )] Overall ejection flow rate in the plane is desirably 1.2 m / sec. Or less. Also, if the discharge port angle is too upward, there is a danger that molten steel will blow out of the mold and sparks will be scattered when casting the molten metal in the casting operation, while if the discharge port is too downward, inclusions and bubbles will be removed. It is not preferable because it is drawn downward. Therefore, in order to prevent such a problem from occurring and to achieve the above-described discharge flow rate, the discharge angle must be set at 10 ° ≦ α y ≦ 90.
{, −35} ≦ α z ≦ 35 ° (see FIGS. 7 and 8).
【0087】<具体例9>図9は本発明の具体例9に係
る連続鋳造用注入装置の浸漬ノズル51及び絞り部52
を示す図であり、図9の(a)はその縦断面図、図9の
(b),(c),(d)はそれぞれ図9の(a)に示す
b−b線,c−c線,d−d線における横断面図であ
る。本具体例9では、図9に示す様に浸漬ノズル51の
下流側の流路横断面積を大きくしており、これにより更
に溶鋼流速の緩和を図っている。<Embodiment 9> FIG. 9 shows an immersion nozzle 51 and a squeezing section 52 of a casting apparatus for continuous casting according to Embodiment 9 of the present invention.
9 (a) is a longitudinal sectional view, and FIGS. 9 (b), (c) and (d) are bb line and cc shown in FIG. 9 (a), respectively. FIG. 4 is a cross-sectional view taken along line dd. In this specific example 9, as shown in FIG. 9, the flow passage cross-sectional area on the downstream side of the immersion nozzle 51 is increased, thereby further reducing the flow rate of molten steel.
【0088】鋳片の高品質化とトラブル防止の観点か
ら、流速緩和部の流路横断面積をなるべく大きくし、流
速を遅くすることが望まれるが、板状鋳片を製造する板
状連続鋳造用鋳型では、鋳型短辺方向の内径が、通常3
00mm以内に限られている。From the viewpoint of improving the quality of cast slabs and preventing troubles, it is desirable to increase the cross-sectional area of the flow path of the flow velocity reducing section as much as possible to reduce the flow velocity. In general, the inner diameter of the mold in the short side direction is 3
It is limited to within 00mm.
【0089】しかし本具体例9の様に、浸漬ノズル51
の先端部断面を長軸Qが短軸Pの1.2倍以上の長さで
ある矩形または楕円形として、浸漬ノズル51の上流部
分から下流に向かってしだいに広くする様にし、吐出口
15を上記短軸と平行な面に設ける構成とすることによ
り、板状の鋳片を鋳造する際にも鋳型短辺の長さによる
制約を回避し、流路横断面積を大幅に大きくすることが
できる。However, as in Embodiment 9, the immersion nozzle 51
Is formed in a rectangular or elliptical shape in which the major axis Q is at least 1.2 times as long as the minor axis P, so that the width gradually increases from the upstream portion of the immersion nozzle 51 toward the downstream. Is provided on a surface parallel to the short axis, thereby avoiding restrictions due to the length of the short side of the mold even when casting a plate-like cast piece, and greatly increasing the cross-sectional area of the flow path. it can.
【0090】尚、断面が矩形または楕円形のノズルを製
造する場合は、一般の断面円形のノズルよりも加工費用
が高くなってしまう。従ってコストアップを押して、断
面を矩形または楕円形にする効果が有効に発揮されるに
は、上記の様に長軸Qが短軸Pの1.2倍以上の長さで
あることが望ましい。When a nozzle having a rectangular or elliptical cross section is manufactured, the processing cost is higher than that of a general nozzle having a circular cross section. Therefore, it is desirable that the major axis Q is 1.2 times or more the minor axis P as described above in order to effectively exert the effect of making the cross section rectangular or elliptical by pushing up the cost.
【0091】また上部から下部に向けて流路横断面積を
徐々に拡大する際には、内壁の広がり角度Kを7゜以内
に抑えるのが良い。内壁の広がり角度Kがあまりに大き
い場合は、図10(b)に示す様に、流れの剥離部分R
を生じてしまい、渦ができて流路横断面積全体を有効に
使用できなくなる。従ってこの様な流れの剥離を防止す
るには、図10(a)に示す様に、角度Kを小さくする
と良い。この様に流路横断面積の拡大で効果的に流速の
低減を図ることができる。When the cross-sectional area of the flow passage is gradually increased from the upper part to the lower part, it is preferable that the divergence angle K of the inner wall is suppressed within 7 °. When the spread angle K of the inner wall is too large, as shown in FIG.
And a vortex is formed, making it impossible to effectively use the entire cross-sectional area of the flow path. Therefore, in order to prevent such flow separation, it is preferable to reduce the angle K as shown in FIG. Thus, the flow velocity can be effectively reduced by increasing the cross-sectional area of the flow passage.
【0092】本具体例9(図9参照)も前述と同様に、
浸漬ノズル51の溶鋼導入部分に設けられた絞り部52
により流量調整弁(図示せず)の下流近傍における負圧
が低減され、且つ絞り部52より下流の浸漬ノズル51
の部分では流速が緩和され、閉塞防止と遅い吐出流速が
実現される。この様に鋼板状連続鋳造に適用した場合に
も、鋳片の直行率の改善と操業の安定化が図られる。In the present specific example 9 (see FIG. 9) as well,
A squeezing section 52 provided at the molten steel introduction portion of the immersion nozzle 51
As a result, the negative pressure in the vicinity of the downstream of the flow control valve (not shown) is reduced, and the immersion nozzle 51 downstream of the throttle 52
In the part, the flow velocity is reduced, and the prevention of blockage and the low discharge flow velocity are realized. As described above, even when the present invention is applied to steel plate continuous casting, the slab skew rate can be improved and the operation can be stabilized.
【0093】加えて、本具体例9の浸漬ノズル51の吐
出口を内側から外側に向けて広がる形状としても良く、
これにより更に吐出流の緩流化が図られる。In addition, the discharge port of the immersion nozzle 51 of the ninth embodiment may have a shape that expands from the inside to the outside.
As a result, the discharge flow is further moderated.
【0094】<具体例10>図11の(a)は本発明の
具体例10に係る連続鋳造用注入装置の浸漬ノズル61
と絞り部62を示す断面図であり、図11の(b)は案
内部材63付近を示す斜視図である。<Embodiment 10> FIG. 11A shows an immersion nozzle 61 of a continuous casting pouring apparatus according to Embodiment 10 of the present invention.
FIG. 11B is a cross-sectional view showing the guide member 63 and the drawing portion 62. FIG.
【0095】図11に示す様に、湾曲した案内部材63
を吐出口内部に設置することで、絞り部62を通過し、
浸漬ノズル61の内部を満たしながら流れる溶鋼のう
ち、中心部66bに達した部分を案内部材63の下方の
吐出口65b部分へ、また端部66aに達した部分を吐
出口上方の65aへと分配することになる。As shown in FIG. 11, the curved guide member 63
By installing the inside of the discharge port, it passes through the throttle unit 62,
Among the molten steel flowing while filling the inside of the immersion nozzle 61, a portion reaching the center 66b is distributed to a discharge port 65b below the guide member 63, and a portion reaching the end 66a is distributed to 65a above the discharge port. Will do.
【0096】案内部材63がない場合は図12(b)に
示す様に、吐出口の下方のみから溶鋼が流出する様にな
り、下方からの流速が速くなってしまうが、図12
(a)に示す様に、案内部材63を設け、吐出口65b
からだけでなく吐出口63aからも流出する様に溶鋼の
流れを導くことによって、結果として下端から流出する
流速を低減し、気泡欠陥を低減することができる等の効
果が期待できる。When the guide member 63 is not provided, as shown in FIG. 12B, the molten steel flows out only from below the discharge port, and the flow velocity from below becomes high.
As shown in (a), a guide member 63 is provided, and a discharge port 65b is provided.
By guiding the flow of the molten steel so as to flow out of not only from the discharge port 63a but also from the discharge port 63a, as a result, the flow velocity flowing out from the lower end can be reduced, and effects such as reduction in bubble defects can be expected.
【0097】この様に具体例10は閉塞防止を図りつ
つ、更に溶鋼の吐出を偏らせない様にした連続鋳造用注
入装置である。尚、案内部材63の湾曲の方向は、溶融
金属の流れが曲がる方向に合わせることが必要である。Thus, Embodiment 10 is an injection device for continuous casting in which the discharge of molten steel is not biased while preventing clogging. Note that the direction of curvature of the guide member 63 needs to match the direction in which the flow of the molten metal bends.
【0098】<具体例11>図13は本発明の具体例1
1に係る連続鋳造用注入装置の浸漬ノズル71の下流先
端付近を示す断面図である。鋳型(図示せず)内の溶鋼
74の上表面にはフラックス73が浮かべられており、
浸漬ノズル71が浸漬されている。浸漬ノズル71外側
壁のフラックス73に接する部分に金属製リング76が
設けられており、冷却媒体供給管75から供給される冷
却媒体が該金属製リング76内を循環する構造となって
いる。<Embodiment 11> FIG. 13 shows Embodiment 1 of the present invention.
It is sectional drawing which shows the downstream end vicinity of the immersion nozzle 71 of the injection apparatus for continuous castings concerning No. 1. Flux 73 is floated on the upper surface of molten steel 74 in a mold (not shown),
The immersion nozzle 71 is immersed. A metal ring 76 is provided on the outer wall of the immersion nozzle 71 in contact with the flux 73, and a cooling medium supplied from a cooling medium supply pipe 75 circulates through the metal ring 76.
【0099】この様に金属製リング76が備えられてい
ることにより、溶鋼74の中に浸された浸漬ノズル71
がフラックス73と直接接しないから、浸漬ノズル外周
部の局部的な侵食を防止でき、この金属製リング76が
従来の様な耐火物とは異なり金属製であるから、侵食が
起こらず浸漬ノズル71を効果的に守ることができる。
この際、金属製リング76が溶鋼74やフラックス73
の熱で溶損してしまわない様に、他方金属製リング76
の周りに存在するフラックス73や溶鋼74の凝固が進
行し過ぎない様に、供給管65を通じて空気や水等の冷
却媒体をリング76内部に循環させ、適当な強度で冷却
する。即ち、本具体例11は金属製のリングを用いるこ
とで侵食を防止し、且つ熱による該金属の溶損を冷却す
ることにより防止したものである。従って浸漬ノズル7
1の寿命を長くすることができる。なお、本発明に係る
連続鋳造用注入装置は上記具体例1〜5,7〜11に限
るものではなく、本発明の要旨を逸脱しない限り本発明
に含まれる。Since the metal ring 76 is provided, the immersion nozzle 71 immersed in the molten steel 74 is provided.
Does not come into direct contact with the flux 73, it is possible to prevent local erosion of the outer peripheral portion of the immersion nozzle, and since the metal ring 76 is made of metal unlike a conventional refractory, erosion does not occur and the immersion nozzle 71 Can be effectively protected.
At this time, the metal ring 76 is connected to the molten steel 74 or the flux 73.
Metal ring 76 so as not to be melted by the heat of
A cooling medium such as air or water is circulated through the supply pipe 65 inside the ring 76 so that the solidification of the flux 73 and the molten steel 74 existing around the ring does not progress excessively, and is cooled with appropriate strength. That is, in Example 11, erosion was prevented by using a metal ring, and erosion of the metal due to heat was prevented by cooling. Therefore, the immersion nozzle 7
1 can be extended. In addition, the casting apparatus for continuous casting according to the present invention is not limited to the specific examples 1 to 5 and 7 to 11, and is included in the present invention unless departing from the gist of the present invention.
【0100】[0100]
【実施例】実施例1として、前記具体例2(図2参照)
の連続鋳造用注入装置について各部の大きさを示すと、
3層式のスライドバルブ4の断面積Gが全開時:(3.5)2
×3.14=38.5cm2 の時、湯溜まり部13の流路横断面積
N:(4.25)2 ×3.14=56.7cm2 、絞り部12の流路横断
面積I:(2.7)2×3.14=22.9cm2 、絞り部12の長さ
L:19.4cm、流速緩和部16の流路横断面積H:(4.25)
2 ×3.14=56.7cm2 、流速緩和部16の長さJ:45.9cm
である。EXAMPLE As Example 1, the above-mentioned specific example 2 (see FIG. 2)
Indicating the size of each part about the continuous casting injection device of
When the cross-sectional area G of the three-layer slide valve 4 is fully open: (3.5) 2
When × 3.14 = 38.5 cm 2 , the flow passage cross-sectional area N of the pool 13 is N: (4.25) 2 × 3.14 = 56.7 cm 2 , and the flow passage cross-sectional area I of the constriction part 12 is: (2.7) 2 × 3.14 = 22.9 cm 2. The length L of the throttle section 12: 19.4 cm, the cross-sectional area H of the flow path of the flow velocity reducing section 16: (4.25)
2 × 3.14 = 56.7cm 2 , length J of the flow mitigation part 16: 45.9cm
It is.
【0101】実施例2として、前記具体例7(図7参
照)の連続鋳造用注入装置について各部の大きさを示す
と、浸漬ノズル85の溶鋼導入部分の内径w:85mm、流
速緩和部16の内径D:100mm 、浸漬ノズル85の外径
D´:160mm 、浸漬ノズル85の溶鋼導入部から吐出口
までの長さU:750mm 、吐出口85の開口長さV(浸漬
ノズル上下方向):100mm である。導入部分内径wや長
さUは、図14に示す従来の浸漬ノズルと同じである。As the second embodiment, the size of each part of the continuous casting pouring apparatus of the above-mentioned specific example 7 (see FIG. 7) is as follows. Inner diameter D: 100 mm, outer diameter D 'of the immersion nozzle 85: 160 mm, length U from the molten steel introduction part of the immersion nozzle 85 to the discharge port U: 750 mm, opening length V of the discharge port 85 (vertical direction of the immersion nozzle): 100 mm It is. The introduction portion inner diameter w and length U are the same as those of the conventional immersion nozzle shown in FIG.
【0102】尚、上記各部分の大きさは実施の一例に過
ぎず、上述の例に限るものではない。またw,h,s,
xについては前記式(3)〜(6)を満足するものが推
奨されるということは言うまでもない。また2層式のス
ライドバルブを用いた場合でも同様の効果が期待でき
る。The size of each part is merely an example of the embodiment, and is not limited to the above example. W, h, s,
It goes without saying that it is recommended that x satisfy the expressions (3) to (6). Similar effects can be expected even when a two-layer slide valve is used.
【0103】[0103]
【発明の効果】本発明に係る連続鋳造用注入装置は、浸
漬ノズル吐出口からの吐出流の偏りが少なく、連続鋳造
用注入装置中での大気の吸い込みが殆どなくなり、緩や
かに溶鋼を吐出させることができ、従って均一に凝固
し、割れがなく、介在物欠陥やピンホールが存在しない
金属鋳片を得ることができ、またブレークアウト故障の
発生することがないという効果がある。加えて連続鋳造
用注入装置内の閉塞を防止できるから、浸漬ノズルの寿
命を長くできるという効果があり、交換等のメンテナン
ス作業を軽減できる。The casting apparatus for continuous casting according to the present invention has a small deviation of the discharge flow from the discharge port of the immersion nozzle, hardly sucks the atmosphere in the casting apparatus for continuous casting, and discharges molten steel gently. Therefore, it is possible to obtain a metal slab which solidifies uniformly, is free from cracks, has no inclusion defects or pinholes, and has no breakout failure. In addition, since it is possible to prevent clogging in the casting apparatus for continuous casting, there is an effect that the life of the immersion nozzle can be extended, and maintenance work such as replacement can be reduced.
【0104】また冷却媒体の循環機構を内設した金属製
リングを浸漬ノズル外周部に備えたから、フラックスと
接する部分に発生する浸漬ノズルの局部的侵食を防止で
き、従って浸漬ノズルの寿命を長くすることができる。
その結果、連続鋳造における鋳片の直行化、操業の自動
化を促進することができる。Further, since a metal ring provided with a cooling medium circulation mechanism is provided on the outer periphery of the immersion nozzle, local erosion of the immersion nozzle generated at a portion in contact with the flux can be prevented, and the life of the immersion nozzle can be extended. be able to.
As a result, it is possible to promote straightening of the slab in continuous casting and automation of the operation.
【図1】本発明の具体例1に係る連続鋳造用注入装置を
示す断面図。FIG. 1 is a cross-sectional view showing a continuous casting pouring device according to a first embodiment of the present invention.
【図2】本発明の具体例2に係る連続鋳造用注入装置を
示す断面図。FIG. 2 is a sectional view showing a continuous casting pouring apparatus according to a second embodiment of the present invention.
【図3】本発明の具体例3に係る連続鋳造用注入装置の
絞り部を示す断面図。FIG. 3 is a cross-sectional view showing a drawing portion of an injection device for continuous casting according to a third embodiment of the present invention.
【図4】本発明の具体例4に係る連続鋳造用注入装置の
浸漬ノズルを示す断面図。FIG. 4 is a cross-sectional view showing an immersion nozzle of an injection device for continuous casting according to Example 4 of the present invention.
【図5】本発明の具体例5に係る連続鋳造用注入装置の
浸漬ノズルを示す断面図。FIG. 5 is a sectional view showing an immersion nozzle of an injection device for continuous casting according to a fifth embodiment of the present invention.
【図6】 具体例6(参考例)に係る連続鋳造用注入装
置を示す断面図。FIG. 6 is a cross-sectional view showing a continuous casting pouring apparatus according to a specific example 6 (reference example).
【図7】本発明の具体例7に係る連続鋳造用注入装置の
浸漬ノズルを示す断面図。FIG. 7 is a cross-sectional view showing an immersion nozzle of an injection device for continuous casting according to a seventh embodiment of the present invention.
【図8】本発明の具体例8に係る連続鋳造用注入装置の
浸漬ノズルを示す断面図。FIG. 8 is a cross-sectional view showing an immersion nozzle of an injection device for continuous casting according to Embodiment 8 of the present invention.
【図9】本発明の具体例9に係る連続鋳造用注入装置に
おける、下部が長軸方向に広い浸漬ノズル付近を示す断
面図。FIG. 9 is a cross-sectional view showing the vicinity of an immersion nozzle whose lower part is wide in the long axis direction in the continuous casting injection apparatus according to Example 9 of the present invention.
【図10】本発明の具体例9についての、流れの剥離を
説明する為の断面図。FIG. 10 is a cross-sectional view for explaining flow separation in Example 9 of the present invention.
【図11】本発明の具体例10に係る連続鋳造用注入装
置における、案内部材を有する浸漬ノズル付近を示す
図。FIG. 11 is a view showing the vicinity of an immersion nozzle having a guide member in a continuous casting injection apparatus according to Embodiment 10 of the present invention.
【図12】本発明の具体例10についての、案内部材付
近の溶鋼流れを示す断面図。FIG. 12 is a sectional view showing the flow of molten steel in the vicinity of a guide member according to a specific example 10 of the invention.
【図13】本発明の具体例11に係る連続鋳造用注入装
置の、金属製リングを有する浸漬ノズル付近を示す断面
図。FIG. 13 is a cross-sectional view showing the vicinity of an immersion nozzle having a metal ring in a continuous casting injection apparatus according to Embodiment 11 of the present invention.
【図14】従来の連続鋳造用注入装置を示す断面図。FIG. 14 is a cross-sectional view showing a conventional casting apparatus for continuous casting.
【図15】浸漬ノズル内壁に段部を備えた連続鋳造用注
入装置を示す断面図。FIG. 15 is a cross-sectional view showing a continuous casting pouring device provided with a step on the inner wall of the immersion nozzle.
【図16】鋳型内の溶鋼流動を示す模式図。FIG. 16 is a schematic view showing the flow of molten steel in a mold.
【図17】Nusselt 数(Nu)とReynold 数(Re)の
関係を表すグラフ。FIG. 17 is a graph showing a relationship between Nusselt number (Nu) and Reynold number (Re).
【図18】鋼スラブ連続鋳造機の操業時の溶鋼流れを表
す模式断面図。FIG. 18 is a schematic sectional view showing the flow of molten steel during operation of the continuous steel slab caster.
【図19】本発明の具体例7に係る浸漬ノズルと従来の
浸漬ノズルの、付着物厚みを示すグラフ。FIG. 19 is a graph showing the thickness of deposits on the immersion nozzle according to Example 7 of the present invention and the conventional immersion nozzle.
3:整流ノズル 4:流量調整弁(スライドバルブ) 5:インサートノズル 8:凝固殻 11,21,31,41,51,61,71,81,9
1:浸漬ノズル 12,22,32,52,62:絞り部 13:湯溜まり部 15,85,95:吐出口 16:流速緩和部 21,31:絞り凸部 23:凹部 42:流路絞り部材 63:案内部材 73:フラックス 74:溶鋼 75:供給管 76:金属製リング 82:絞り部分3: Rectifying nozzle 4: Flow control valve (slide valve) 5: Insert nozzle 8: Solidified shell 11, 21, 31, 41, 51, 61, 71, 81, 9
1: immersion nozzle 12, 22, 32, 52, 62: throttle section 13: hot-water pool section 15, 85, 95: discharge port 16: flow rate reducing section 21, 31: throttle convex section 23: concave section 42: flow path throttle member 63: guide member 73: flux 74: molten steel 75: supply pipe 76: metal ring 82: drawn portion
───────────────────────────────────────────────────── フロントページの続き (72)発明者 三宅 俊也 兵庫県神戸市西区高塚台1丁目5番5号 株式会社神戸製鋼所 神戸総合技術研 究所内 (72)発明者 徳永 宏彦 兵庫県加古川市金沢町1番地 株式会社 神戸製鋼所 加古川製鉄所内 (72)発明者 安中 弘行 兵庫県加古川市金沢町1番地 株式会社 神戸製鋼所 加古川製鉄所内 (72)発明者 田井 啓文 兵庫県加古川市金沢町1番地 株式会社 神戸製鋼所 加古川製鉄所内 (56)参考文献 特開 平8−19839(JP,A) (58)調査した分野(Int.Cl.7,DB名) B22D 11/10 330 B22D 11/10 B22D 41/50 520 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiya Miyake 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Kobe Steel, Ltd. Kobe Research Institute (72) Inventor Hirohiko Tokunaga Kanazawa, Kakogawa City, Hyogo Prefecture No. 1 Kobe Steel Works Kakogawa Works (72) Inventor Hiroyuki Annaka 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Kobe Steel Works Kakogawa Works (72) Inventor Keifumi Tai 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Kobe Steel, Ltd. Kakogawa Works (56) References JP-A-8-19839 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B22D 11/10 330 B22D 11/10 B22D 41/50 520
Claims (10)
ズルを介して浸漬ノズルを備え、該浸漬ノズルの吐出口
から鋳型内に溶融金属を吐出する連続鋳造用注入装置に
おいて、 上記浸漬ノズルにおける溶融金属導入部分に絞り部を設
けると共に、 該浸漬ノズルの絞り部より前記吐出口に至る迄の浸漬ノ
ズルの部分を流速緩和部とし、 上記絞り部の流路横断面積が、上記流量調整弁の全開時
の流路横断面積の50〜90%であり、 上記流速緩和部の流路横断面積が前記絞り部の流路横断
面積よりも大きく、該流速緩和部の長さが上記絞り部の
内径の3倍以上であることを特徴とする連続鋳造用注入
装置。1. An injection device for continuous casting, comprising a flow control valve upstream and a dip nozzle downstream through a straightening nozzle, and discharging molten metal into a mold from a discharge port of the dip nozzle. A throttle portion is provided at the molten metal introduction portion in the above, and a portion of the immersion nozzle from the throttle portion of the immersion nozzle to the discharge port is a flow rate reducing portion. Is 50 to 90% of the cross-sectional area of the flow path at the time of full opening, the cross-sectional area of the flow path of the flow velocity reducing section is larger than the cross-sectional area of the flow path of the restricting section, and the length of the flow velocity reducing section is smaller than that of the restricting section. An injection device for continuous casting, characterized in that it is at least three times the inner diameter.
を夫々備え、該浸漬ノズルの吐出口から鋳型内に溶融金
属を吐出する連続鋳造用注入装置において、 上記流量調整弁より下流側であって上記浸漬ノズルより
上流側に流路絞り部材を設けるか、あるいは上記浸漬ノ
ズルにおける溶融金属導入部分に絞り部を設け、 上記流路絞り部材あるいは上記絞り部の流路横断面積
が、上記流量調整弁の全開時の流路横断面積の50〜9
0%であり、 上記浸漬ノズルの吐出口の形状が、浸漬ノズル内部から
外部に向けて水平方向に広がって、上記吐出口の孔径が
浸漬ノズル内側より外側の方が大きくなったものである
ことを特徴とする連続鋳造用注入装置。2. An injection device for continuous casting, comprising a flow control valve upstream and a dipping nozzle downstream, and discharging molten metal into a mold from a discharge port of the dipping nozzle. There is provided a flow path restricting member on the upstream side of the immersion nozzle, or a restrictor is provided at a molten metal introduction portion in the immersion nozzle, the flow path cross-sectional area of the flow path restricting member or the restrictor is the flow rate 50 to 9 of the flow path cross-sectional area when the regulating valve is fully opened
0%, and the shape of the discharge port of the immersion nozzle is expanded in the horizontal direction from the inside of the immersion nozzle to the outside, and the hole diameter of the discharge port is
A casting apparatus for continuous casting, characterized in that the outside is larger than the inside of the immersion nozzle .
を夫々備え、該浸漬ノズルの吐出口から鋳型内に溶融金
属を吐出する連続鋳造用注入装置において、 上記流量調整弁より下流側であって上記浸漬ノズルより
上流側に流路絞り部材を設けるか、あるいは上記浸漬ノ
ズルにおける溶融金属導入部分に絞り部を設けると共
に、 上記流量調整弁より下流であって上記流路絞り部材ある
いは上記絞り部より上流側に湯溜まり部を有し、 該湯溜まり部の流路横断面積が、上記流量調整弁の全開
時の流路横断面積の100〜250%であり、 且つ上記流路絞り部材あるいは上記絞り部の流路横断面
積が、上記湯溜まり部の流路横断面積の40〜85%で
あることを特徴とする連続鋳造用注入装置。3. An injection device for continuous casting, comprising a flow control valve upstream and a submerged nozzle downstream, and discharging molten metal into a mold from a discharge port of the submerged nozzle. And a flow path restricting member is provided upstream of the immersion nozzle, or a restricting section is provided at a molten metal introduction portion of the immersion nozzle, and the flow path restricting member or the restrictor is downstream of the flow rate regulating valve. A water pool section upstream of the flow path, wherein the cross section of the flow path of the pool is 100 to 250% of the cross sectional area of the flow path when the flow regulating valve is fully opened, and the flow path restricting member or The casting apparatus for continuous casting, wherein a cross-sectional area of the flow passage of the narrowed portion is 40 to 85% of a cross-sectional area of the flow passage of the pool.
り前記吐出口に至る迄の浸漬ノズルの部分を流速緩和部
とし、 該流速緩和部の流路横断面積が前記流路絞り部材あるい
は前記絞り部の流路横断面積よりも大きく、該流速緩和
部の長さが上記流路絞り部材あるいは上記絞り部の内径
の3倍以上である請求項3に記載の連続鋳造用注入装
置。4. The flow path restricting member or a part of the immersion nozzle from the restricting section to the discharge port is a flow rate reducing section, and the flow path cross-sectional area of the flow rate reducing section is the flow path restricting member or the restrictor. 4. The continuous casting injection device according to claim 3, wherein the flow-passage reducing portion is larger than the flow passage cross-sectional area of the portion, and the length of the flow velocity reducing portion is at least three times the inner diameter of the flow passage restricting member or the restricting portion.
続鋳造用注入装置において、 上記浸漬ノズルの吐出口の形状が、浸漬ノズル内部から
外部に向けて水平方向に広がって、上記吐出口の孔径が
浸漬ノズル内側より外側の方が大きくなったものである
連続鋳造用注入装置。In continuous casting injection device according to any one of claims 5] claims 1,3,4, the shape of the discharge port of the immersion nozzle, spreads horizontally from the inside toward the outside the immersion nozzle, the The diameter of the discharge port
An injection device for continuous casting, which is larger on the outside than on the inside of the immersion nozzle .
ルの絞り部が、流路横断面積の小さい狭隘部を2以上備
えたものである請求項1〜5のいずれかに記載の連続鋳
造用注入装置。Wherein said flow path diaphragm member or diaphragm portion of the immersion nozzle, injection continuous casting according to any one of claims 1 to 5, which was equipped with two or more small narrow portion of the flow path cross-sectional area apparatus.
上記流量調整弁の全開時の流路横断面積の150%以上
である請求項1,4〜6のいずれかに記載の連続鋳造用
注入装置。7. The continuous casting according to any one of claims 1, 4 to 6 , wherein the flow velocity moderating portion has a flow path cross-sectional area that is 150% or more of a flow path cross-sectional area when the flow control valve is fully opened. Injection device.
短軸の1.2倍以上の長さである矩形、楕円形またはこ
れらの組合せ形状であり、上記吐出口は上記短軸と平行
な面に設けられたものである請求項1〜7のいずれかに
記載の連続鋳造用注入装置。8. The cross section at the tip of the immersion nozzle is rectangular, elliptical, or a combination thereof in which the major axis is at least 1.2 times the minor axis, and the discharge port is connected to the minor axis. The injection device for continuous casting according to any one of claims 1 to 7 , wherein the injection device is provided on a parallel surface.
流を上下に分割する案内部材を有するものである請求項
1〜8のいずれかに記載の連続鋳造用注入装置。9. The immersion nozzle for continuous casting injection device according to any one of those having a guide member for dividing the discharge flow down the interior of the discharge port claims 1-8.
スに接する外周部に、冷却媒体を循環させる機構を内設
した金属製リングを備えたものである請求項1〜9のい
ずれかに記載の連続鋳造用注入装置。10. The immersion nozzle according to any one of claims 1 to 9 , wherein a metal ring having a mechanism for circulating a cooling medium is provided on an outer peripheral portion in contact with the flux in the mold. Injection device for continuous casting.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7244885A JP3050101B2 (en) | 1994-09-22 | 1995-09-22 | Continuous casting pouring equipment |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22832394 | 1994-09-22 | ||
JP7-40907 | 1995-02-28 | ||
JP6-228323 | 1995-02-28 | ||
JP4090795 | 1995-02-28 | ||
JP7244885A JP3050101B2 (en) | 1994-09-22 | 1995-09-22 | Continuous casting pouring equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08294757A JPH08294757A (en) | 1996-11-12 |
JP3050101B2 true JP3050101B2 (en) | 2000-06-12 |
Family
ID=27290638
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7244885A Expired - Fee Related JP3050101B2 (en) | 1994-09-22 | 1995-09-22 | Continuous casting pouring equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3050101B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7905432B2 (en) | 2002-07-31 | 2011-03-15 | Shinagawa Refractories Co., Ltd. | Casting nozzle |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001300699A (en) * | 2000-04-25 | 2001-10-30 | Toshiba Ceramics Co Ltd | Flat immersion nozzle |
SK287958B6 (en) * | 2000-06-23 | 2012-07-03 | Vesuvius Crucible Company | Continuous casting nozzle with pressure modulator |
KR100946659B1 (en) * | 2002-11-28 | 2010-03-10 | 주식회사 포스코 | Submerged entry nozzle for continuous casting |
RU2433884C1 (en) * | 2008-03-27 | 2011-11-20 | Кросаки Харима Корпорейшн | Immersible teeming barrel for continuous casting |
JP5047854B2 (en) | 2008-03-27 | 2012-10-10 | 黒崎播磨株式会社 | Immersion nozzle for continuous casting |
JP4578555B2 (en) * | 2008-12-27 | 2010-11-10 | 黒崎播磨株式会社 | Immersion nozzle for continuous casting |
JP5266154B2 (en) * | 2009-07-17 | 2013-08-21 | 株式会社神戸製鋼所 | Rectifying structure that suppresses drift caused by opening and closing of slide plate |
US9676029B2 (en) | 2010-07-02 | 2017-06-13 | Vesuvius Crucible Company | Submerged entry nozzle |
PL2588262T3 (en) * | 2010-07-02 | 2020-06-01 | Vesuvius U S A Corporation | Submerged entry nozzle |
JP5645736B2 (en) | 2011-03-31 | 2014-12-24 | 黒崎播磨株式会社 | Immersion nozzle for continuous casting |
KR102207707B1 (en) * | 2019-04-30 | 2021-01-26 | 주식회사 포스코 | Nozzle and casting method |
JP7121299B2 (en) * | 2019-12-27 | 2022-08-18 | 品川リフラクトリーズ株式会社 | immersion nozzle |
CN112325639A (en) * | 2020-11-04 | 2021-02-05 | 湖南中联志远车轮有限公司 | Metal casting furnace |
-
1995
- 1995-09-22 JP JP7244885A patent/JP3050101B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7905432B2 (en) | 2002-07-31 | 2011-03-15 | Shinagawa Refractories Co., Ltd. | Casting nozzle |
Also Published As
Publication number | Publication date |
---|---|
JPH08294757A (en) | 1996-11-12 |
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