JPS60114513A - Decreasing method of inclusion - Google Patents

Decreasing method of inclusion

Info

Publication number
JPS60114513A
JPS60114513A JP22053383A JP22053383A JPS60114513A JP S60114513 A JPS60114513 A JP S60114513A JP 22053383 A JP22053383 A JP 22053383A JP 22053383 A JP22053383 A JP 22053383A JP S60114513 A JPS60114513 A JP S60114513A
Authority
JP
Japan
Prior art keywords
molten steel
tundish
holes
inclusions
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP22053383A
Other languages
Japanese (ja)
Inventor
Ikuo Sawada
郁夫 沢田
Shozo Mizoguchi
溝口　庄三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP22053383A priority Critical patent/JPS60114513A/en
Publication of JPS60114513A publication Critical patent/JPS60114513A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/119—Refining the metal by filtering

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE:To remove effectively the inclusions in a molten steel in a stage of supplying the molten steel via a tundish to a casting mold by disposing plural pieces of gates having a specific construction into the tundish and passing the molten steel through the through-holes provided to the gates. CONSTITUTION:A molten steel 2 is supplied in a static flow state by an immersion nozzle 3 ito a tundish 1 in the stage of receiving the molten steel 2 from a ladle into the tundish 1 and supplying the same through a bottom nozzle 5 into a continuous casting mold, etc. Plural gates 4 provided with plural through- holes 7 having diameter d(cm), number (n) and sectional area Scm<2> of the flow passage for the molten steel satisfying the figures expressed by the equation (1) are installed at an interval Lcm in the tundish 1 so as to cross the flow passage for the molten steel 2. The molten steel 2 passes through the holes of the gates 4 and collides against the wall of the next gate 4 while the molten steel flows through the outlet of the nozzle 3 to the tundish nozzle 5. The inclusions contained in the molten steel are flocculated and aggregated by the turbulence generated in the molten steel in this stage and are stuck to the refractory wall of the gates, by which the inclusions are separated and removed. The clean steel is supplied through the nozzle 5 into the casting mold.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、タンディツシュ等の溝型容器において溶鋼中
に浮遊する介在物を低減する方法に係るものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for reducing inclusions floating in molten steel in a channel-shaped container such as a tundish.

従来技術 近年、鋼の高品質化ニーズに伴って、割れの原因となる
介在物の低減が重要視されてきた。特に、鉄鋼の連続鋳
造に用いられるタンディツシュにおいては１種々の介在
物低減対策が講じられている。すなわち、現在行われて
いるタンディツシュにおける介在物低減方法を大別して
みると、（１）堰装置等による浮上分離促進、（２）不
活性ガス吹込みによる吸着分離、（３）乱流利用による
凝集・合体促進（特開昭５５−３３８５３号）　、　（
４）フィルターによる除去（鉄と鋼１月、８９１６．１
８８３年）等がある。BACKGROUND OF THE INVENTION In recent years, with the need for higher quality steel, the reduction of inclusions that cause cracks has become important. In particular, various measures have been taken to reduce inclusions in tundishes used for continuous casting of steel. In other words, if we roughly categorize the currently used methods for reducing inclusions in tundishes, we can: (1) promote flotation separation using weir devices, (2) adsorption separation by inert gas injection, and (3) flocculation by utilizing turbulence.・Promotion of merging (Unexamined Japanese Patent Publication No. 55-33853), (
4) Removal by filter (Tetsu to Hagane January, 8916.1
883) etc.

しかしながら、（１）　、　（２）の方法によれば、こ
れらの方法単独では効果が未だ不十分であり、他の方法
との併用が必要である。また、（２）の方法については
介在物を減少させ、鋼の清節度を向上させるためには、
吹込みガス気泡を２〜５ｍ／ｍ程度に微細化する必要が
あるが、現状では十分な微細化効果は得られていない。However, according to methods (1) and (2), the effects are still insufficient when used alone, and it is necessary to use them in combination with other methods. Regarding method (2), in order to reduce inclusions and improve the clarity of steel,
Although it is necessary to refine the blown gas bubbles to about 2 to 5 m/m, a sufficient refinement effect cannot be obtained at present.

（３）の方法については、特公昭５５−３３８５３号に
記載された例及び第１図に示した不活性カス気泡の攪拌
力を利４用する例等がある。第１図では、ロングノズル
３から注入された溶鋼２が、堰４の貫通孔７を通って又
、底吹きポーラスプラグ６より吹込まれたＡｒガスによ
って攪拌され、タンディツシュノズル５から流出する状
況を示している。Regarding the method (3), there are an example described in Japanese Patent Publication No. 55-33853 and an example in which the stirring power of inert gas bubbles is utilized as shown in FIG. In FIG. 1, molten steel 2 injected from a long nozzle 3 passes through a through hole 7 of a weir 4, is stirred by Ar gas blown from a bottom-blown porous plug 6, and flows out from a tundish nozzle 5. It shows.

これらは発生した乱流を利用して、溶鋼中に浮遊する介
在物の凝集・合体を促進する主旨の方法であるが、これ
にはさらに、成長した介在物を安定に浮上分離除去する
次のプロセスが必要となる。These methods utilize the generated turbulence to promote agglomeration and coalescence of inclusions floating in molten steel. process is required.

（４）の方法については、溶鋼の通過流獄を確保するに
足る孔径のフィルターを用いた場合、介在物の低減効果
があがらなくなる欠点がある。Regarding method (4), there is a drawback that if a filter having a pore size sufficient to ensure a flow hole for molten steel is used, the effect of reducing inclusions will not be enhanced.

発明の目的 本発明はこれら諸欠点を有利に解決し、溶鋼中の介在物
の低減を目的とするものである。OBJECTS OF THE INVENTION The present invention aims to advantageously solve these drawbacks and reduce inclusions in molten steel.

発明の構成・作用 すなわち、本発明はタンディツシュの溶鋼流路横断面方
向に貫通孔を有する特定の複数個の堰を設け、貫通孔か
ら吐出された堰の耐火物壁への衝突噴流を利用して局所
的な乱流を生ぜしめ、凝集合体し成長した介在物を効率
良く耐火物に刺着させ除去することを特徴とする溶鋼中
の介在物低減方法に関するものである。Structure and operation of the invention That is, the present invention provides a specific plurality of weirs having through holes in the cross-sectional direction of the molten steel flow path of the tundish, and utilizes the jet flow discharged from the through holes and colliding with the refractory wall of the weir. The present invention relates to a method for reducing inclusions in molten steel, which is characterized in that the inclusions that have aggregated, coalesced, and grown are efficiently stuck to a refractory and removed by generating local turbulence.

以下、本発明の方法を図面に基いて説明する。Hereinafter, the method of the present invention will be explained based on the drawings.

連続鋳造法または汀通造塊法で、取鍋から鋳型に溶鋼を
注入する際に、溶鋼の注入流を静流とするためにタンデ
ィツシュが使われる。When injecting molten steel from a ladle into a mold in the continuous casting method or ingot making method, a tanditshu is used to make the injection flow of molten steel into a static flow.

水弟１の発明にあっては、第２図（ａ）に示すように、
取鍋などからロングノズル３を介して、溶鋼２がタンデ
ィツシュｌに注がれ、複数個の堰４を通った溶鋼２はタ
ンディツシュノズル５より吐出し鋳型（モールド）に移
される。なお図中の矢印は溶鋼の流れる方向を示す。As shown in Fig. 2(a), in the invention of Suiden 1,
Molten steel 2 is poured into a tundish l from a ladle or the like through a long nozzle 3, and the molten steel 2 that has passed through a plurality of weirs 4 is discharged from a tundish nozzle 5 and transferred to a mold. Note that the arrows in the figure indicate the direction in which molten steel flows.

この場合、第２図（ｂ）に示すように、溶鋼が連続的に
流れるタンディツシュの流路断面に、直径ｄ（ｃｍ）の
貫通孔ｎ個を有する堰４を間隔Ｌ（ｃｍ）Ｍして複数個
配置する。In this case, as shown in Fig. 2(b), weirs 4 having n through holes with diameter d (cm) are installed at intervals of L (cm) M in the cross section of the tundish through which molten steel flows continuously. Place multiple pieces.

また、それぞれの堰の貫通孔の配置については、一般に
流体が壁の貫通孔、ノズル等を通して流れる場合には、
最大的２０６の広がり角をもって吐出されることが知ら
れていることから、第２図（Ｃ）に示すように、隣り合
う噴流同士は、それぞれ２０°以内の広がり角で吐出す
るとした場合に、互いに重ならずに下流側の堰の壁に衝
突するように配置し、これに応じて堰の間隔りを決定す
るものとする。In addition, regarding the arrangement of the through holes of each weir, generally when fluid flows through through holes in the wall, nozzles, etc.
Since it is known that jets are ejected with a maximum divergence angle of 206 degrees, if adjacent jets are discharged with divergence angles within 20 degrees, as shown in FIG. 2(C), They shall be arranged so that they collide with the wall of the weir on the downstream side without overlapping each other, and the spacing between the weirs shall be determined accordingly.

第３図、第４図に低度アルミギルド鋼を、６０ｔのＡｒ
シールドタンディツシュを用いて介在物の除去実験を行
った結果を示す。なお、堰の耐火物材料として、アルミ
ナグラファイトれんがを使用したが、その他のマグカー
ボンれんが、石灰れんが等を使用しても良い。また表−
１には設定した諸条件を示した。Figures 3 and 4 show low-grade aluminum guild steel and 60t Ar
The results of an inclusion removal experiment using a shielded tundish are shown. Although alumina graphite bricks were used as the refractory material for the weir, other materials such as magcarbon bricks and lime bricks may also be used. Also table-
1 shows the various conditions that were set.

表−１ 堰は３枚堰を用いた。尚、介在物の低減効果を表わす指
標として、鋳片表層下１００　ｍ／ｍ位置における５３
ｐＬ以上のスライム−抽出法による介在物個数を従来法
との比較で表わした介在物指数ηを用いた。介在物指数
が小さい程、介在物の低減効果が大きい。ここで従来法
とは表−２に示した条件における操業をいう。Table 1: Three weirs were used. In addition, as an index showing the effect of reducing inclusions, 53
An inclusion index η, which represents the number of inclusions obtained by the slime extraction method of pL or more in comparison with the conventional method, was used. The smaller the inclusion index, the greater the effect of reducing inclusions. Here, the conventional method refers to operation under the conditions shown in Table 2.

表−２ なお、Ｓは定常状態での溶鋼流路断面積〔Ｃｍ′〕を示
すものとする。Table 2 Note that S represents the cross-sectional area of the molten steel flow path [Cm'] in a steady state.

第３図には結果を整理して、堰の間隔りと貫通孔直径ｄ
との比Ｌ／ｄ、介在物指数ηとの関係を示した。ただし
、グラフ中Ｑ　／　ｄ　ｎは、丸が８０、四角が６０、
三角が４０の場合を表わしている。Figure 3 summarizes the results and shows the weir spacing and through hole diameter d.
The relationship between the ratio L/d and the inclusion index η is shown. However, Q/d n in the graph is 80 for a circle, 60 for a square,
This represents the case where there are 40 triangles.

４≦Ｌ／ｄ≦１８．又Ｑ　／　ｄ　ｎ≧４０において低
減効果が認められた。4≦L/d≦18. Further, a reduction effect was observed when Q/d n≧40.

第４図には、Ｑ　／　ｄ　ｎが８０の場合の攪拌強度を
表わすパラメータＱ／ｄｎＳＬと、介在物指数ηとの関
係を示した。FIG. 4 shows the relationship between the parameter Q/dnSL representing the stirring intensity and the inclusion index η when Q/dn is 80.

Ｑ／ｄｎＳＬが１０以上で効果が認められた。The effect was recognized when Q/dnSL was 10 or more.

以上の操業データより、 式 なる条件において介在物の低減効果が現れるものと認め
られた。From the above operational data, it was recognized that the effect of reducing inclusions appears under the conditions of the formula.

次に第５図には、溶鋼の浴面下よりの攪拌ガス吹込みを
併用した末弟２の発明方法の一例を示す、これは各堰間
において、溶鋼浴面下より、底吹きポーラスプラグ６、
或いは浸漬ランスを用いた不活性ガス等の攪拌ガスの吹
込みを伴うことにより溶鋼の攪拌を助長し、介在物の凝
集書合体、気泡による吸着除去効果を付加するものであ
る。Next, Fig. 5 shows an example of the invention method of the youngest brother 2, which also uses stirring gas injection from below the molten steel bath surface. ,
Alternatively, stirring of the molten steel is promoted by blowing in a stirring gas such as an inert gas using an immersion lance, and the effect of adsorption and removal by agglomeration and coalescence of inclusions and bubbles is added.

第６図には低度アルミキルド鋼を６０ｔのＡ「シールド
タンディツシュを用いて、３枚堰ではさまれた２つの部
屋に攪拌ガスとしてＡｒガスを使った吹込み実験を行な
った結果を示す。Figure 6 shows the results of an experiment in which low-grade aluminum killed steel was injected into two rooms sandwiched by three weirs using a 60-ton A shield tundish and Ar gas was used as the stirring gas.

表−３にはその時の諸条件について示した。Table 3 shows the various conditions at that time.

表−３ 尚、Ａｒガスは基間タンディツシュ底部に設けた２ケの
ポーラスプラグより所定の論′量を吹込んだ。第６図は
、吹込みＡｒガス流ｌ　Ｑ　Ａ　ｒと介在物指数ηの関
係を示した。カス流星ＱＡｒが２　ＣＮ文／ｍ１ｎｅｌ
堰区間〕以上において介在物の除去効果が現れるのがわ
かる。Table 3 Ar gas was blown in a predetermined stoichiometric amount through two porous plugs provided at the bottom of the tundish between the bases. FIG. 6 shows the relationship between the blown Ar gas flow l Q A r and the inclusion index η. Kasu Ryusei QAr is 2 CN text/m1nel
It can be seen that the effect of removing inclusions appears above the weir section.

実施例 低次アルミギルド鋼を６０ｔのＡｒシールドタンディツ
シュを用い、３枚堰で各種条件を変化させて連続鋳造を
行なった結果を表−４に示した。EXAMPLE Table 4 shows the results of continuous casting of low-order aluminum guild steel using a 60 t Ar-shielded tundish in a three-weir system under various conditions.

なお、この場合の溶鋼温度は１５８０″Ｃ５溶鋼流路断
面積Ｓは８０００ｃｎｆであり、堰の貫通孔は吐出され
た噴流の広がり角を２０°とした場合に各噴流が東なら
ずに下流側の堰に衝突するように配置した。In addition, the molten steel temperature in this case is 1580'', and the cross-sectional area S of the C5 molten steel flow path is 8000 cnf, and when the spread angle of the discharged jet is set to 20°, the through hole of the weir is located on the downstream side instead of east. It was placed so that it would collide with the weir.

Ｎｏ、１１及び１２は基間の底部よりポーラスプラグか
らＡ「カスを吹込んだもので、介在物の低減効果がより
優れている。Nos. 11 and 12 are those in which A's dregs were blown into the bottom part between the bases from the porous plug, and the effect of reducing inclusions was more excellent.

発明の効果 以］−詳述したことく、本発明方法は貫通孔より吐出す
る噴流を下流側の堰壁に衝突させるごとにより、耐人物
壁近傍に局所的に乱流の激しい部分を発生させ、溶鋼中
に浮遊する介在物の凝集・合体成長を促進せしめ、効率
良く耐火物壁へ移動させ、Ｕ着除去することを可能にし
、又は気泡による吸着除去効果を付加した方法であり、
溶鋼中の介在物を低減させ、これにより鋳片品質を安定
的に向上させる方法が可能となった。[Effects of the Invention] - As described in detail, the method of the present invention causes a region of locally intense turbulence to be generated in the vicinity of the dam wall each time the jet discharged from the through hole collides with the weir wall on the downstream side. , a method that promotes the agglomeration and coalescence of inclusions floating in molten steel, efficiently moves them to the refractory wall, makes it possible to remove U adhesion, or adds an adsorption removal effect using air bubbles,
A method has become possible to reduce inclusions in molten steel and thereby stably improve slab quality.

なお、本発明方法は、鋼の製造のみならず、非鉄金属の
製造工程にも応用することができるものである。Note that the method of the present invention can be applied not only to the production of steel but also to the production process of non-ferrous metals.

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

第１図は、従来の例の立面断面説明図、第２図（ａ）、
（ｂ）及び（ｃ）は本節１の発明の説ＩＪＩＪ図で、第
２図（ａ）は立面断面図、第２図（ｂ）は堰の形状を示
す斜視図、７５２図（ｃ）は堰の貫通孔から溶鋼の噴出
する状態を説ＩＩするものである。 第３及び４図は水弟１の発明の効果を示すグラフである
。 第５図は本節２の発明の説明図で立面断面図である。 第６図は水弟２の発明の効果を示すグラフである。 １−・・タンディツシュ、２・・中溶鋼、３・・・ロン
グノズル、４・・・堰、５・−・タンディツシュノズル
、６・・・底吹きポーラスプラグ、７・・・貫通孔。 特許出願人　新１」木製鐵株式會社 代理人　弁理士　井　上　雅　生 第１図 第２図（Ｑ） 第２図（ｂ） ム 第２図（Ｃ） 第３図 ％ 第４図 ９１￥ＳＬ 第５図 ｂ 第６図 ＱＡｒ（％ｉｎ　）Fig. 1 is an explanatory elevation cross-sectional view of a conventional example, Fig. 2(a),
(b) and (c) are IJIJ diagrams of the invention of this Section 1, Figure 2 (a) is an elevation sectional view, Figure 2 (b) is a perspective view showing the shape of the weir, and Figure 752 (c). Theory II describes the situation in which molten steel gushes out from a through hole in a weir. Figures 3 and 4 are graphs showing the effects of Mizui's invention. FIG. 5 is an explanatory diagram of the invention of Section 2, and is an elevational sectional view. FIG. 6 is a graph showing the effect of the invention of Sui-Tei 2. 1--Tandish nozzle, 2--Medium molten steel, 3--Long nozzle, 4--Weir, 5---Tandish nozzle, 6...Bottom-blown porous plug, 7...Through hole. Patent Applicant New 1 Wooden Iron Co., Ltd. Agent Patent Attorney Masaru Inoue Figure 1 Figure 2 (Q) Figure 2 (b) Figure 2 (C) Figure 3% Figure 4 91￥SL Figure 5b Figure 6 QAr (%in)

Claims (2)

【特許請求の範囲】[Claims] （１）溶鋼の流路横断面方向に貫通孔を有する複数個の
堰を備えたタンディツシュにおいて、複数個の堰が以下
の式で示す条件を満し、 ただし、ｄ：貫通孔の直径（ｃｍ）、ｎ５貫通孔の数Ｑ
：溶鋼流Ｑ（ｃｍ’　／　５ｅｃ）、Ｓ；溶鋼流路断面
積（ｃｍ’）　、Ｌ　＋堰の間隔（ｃｍ）、ＭＩＮ　（
ｘ・ｙ）：ｘとｙのうち最小イ１ム汀つ、貫通孔から吐
出ごれた各噴流が重ならずに下流側の壜の壁に衝突する
ように複数個の堰を配；〆Ｌしたことを特徴とする介在
物の低減方法。(1) In a tundish equipped with a plurality of weirs having through holes in the cross-sectional direction of the molten steel flow path, the plurality of weirs satisfy the conditions expressed by the following formula, where d is the diameter of the through hole (cm ), n5 number of through holes Q
: Molten steel flow Q (cm'/5ec), S; Molten steel flow path cross-sectional area (cm'), L + weir spacing (cm), MIN (
x・y): The minimum value of x and y is 1, and multiple weirs are arranged so that each jet stream discharged from the through hole collides with the wall of the bottle on the downstream side without overlapping; A method for reducing inclusions, characterized in that L. （２）溶鋼の流路横断面方向に貫通孔を有する複数個の
堰を備えたタンディンシュにおいて、複数個の堰が以下
の式で示す条件を満し、 ただし、ｄ：貫通孔の直径（ｃｎ＋）、ｎ：貫通孔の数
Ｑ：溶鋼流量（ｃｍ’／５ｅｃ）、Ｓ：溶鋼流路断面積
（ｃｍ’）　、　Ｌ　：堰の間隔（ｃｍ）、ＭＩＮ　（
Ｘ　、　Ｙ　）＝：　Ｘ、！ｌ：１１のうち最小イＩＣ
ｉ且つ、貫通孔から吐出された各噴流が重ならずに下流
の堰の壁に衝突するごとく複数個の堰を配置し、さらに
前後２枚の堰で区切られた部屋の浴面下より、攪拌カス
を流量２（Ｎ文／ｗｉｎ）以−にで吹き込むことを特徴
とする介在物の低減方法。(2) In a tundish equipped with multiple weirs having through holes in the cross-sectional direction of the molten steel flow path, the multiple weirs satisfy the conditions expressed by the following formula, where d: Diameter of the through hole (cn+ ), n: number of through holes Q: molten steel flow rate (cm'/5ec), S: molten steel flow path cross-sectional area (cm'), L: weir interval (cm), MIN (
X, Y) =: X,! l:Minimum IC among 11
In addition, a plurality of weirs are arranged so that each jet stream discharged from the through hole collides with the wall of the downstream weir without overlapping, and further, from below the bath surface of a room separated by two weirs in the front and back, A method for reducing inclusions, characterized by blowing in stirring scum at a flow rate of 2 (N/win) or higher.
JP22053383A 1983-11-25 1983-11-25 Decreasing method of inclusion Pending JPS60114513A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22053383A JPS60114513A (en) 1983-11-25 1983-11-25 Decreasing method of inclusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22053383A JPS60114513A (en) 1983-11-25 1983-11-25 Decreasing method of inclusion

Publications (1)

Publication Number Publication Date
JPS60114513A true JPS60114513A (en) 1985-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP22053383A Pending JPS60114513A (en) 1983-11-25 1983-11-25 Decreasing method of inclusion

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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU585139B2 (en) * 1986-03-26 1989-06-08 Foseco International Limited Purifying steel
FR2676381A1 (en) * 1991-05-15 1992-11-20 Daussan & Co Method for purifying liquid metal in a metallurgical decantation vessel equipped with at least two filters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU585139B2 (en) * 1986-03-26 1989-06-08 Foseco International Limited Purifying steel
FR2676381A1 (en) * 1991-05-15 1992-11-20 Daussan & Co Method for purifying liquid metal in a metallurgical decantation vessel equipped with at least two filters

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