JPH07195161A - Method for removing inclusion in continuous casting of steel - Google Patents
Method for removing inclusion in continuous casting of steelInfo
- Publication number
- JPH07195161A JPH07195161A JP35544693A JP35544693A JPH07195161A JP H07195161 A JPH07195161 A JP H07195161A JP 35544693 A JP35544693 A JP 35544693A JP 35544693 A JP35544693 A JP 35544693A JP H07195161 A JPH07195161 A JP H07195161A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- gas
- tundish
- pouring
- ladle
- 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.)
- Granted
Links
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造におい
て、溶鋼中の介在物を除去する方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing inclusions in molten steel in continuous casting of steel.
【０００２】[0002]
【従来の技術】溶鋼中にはＡｌ2 Ｏ3 等の介在物が含ま
れており、この介在物が鋳片に混入するのを防ぐため、
従来から多くの試みがなされてきた。とくに介在物が連
続鋳造のモールド内に持ち込まれると、鋳片に捕捉され
てしまう可能性が高くなるので、溶鋼が鋳型に注入され
るよりも前の段階で、介在物をできるだけ低減しておく
必要がある。このためタンディッシュ内の溶鋼につい
て、いくつかの、介在物低減の試みがなされてきた。Of the Related Art in the molten steel contains inclusions such as Al 2 O 3, to prevent the the inclusions are mixed into the cast strip,
Many attempts have been made in the past. In particular, if inclusions are brought into the continuous casting mold, it is more likely that they will be captured by the slab, so reduce inclusions as much as possible before the molten steel is poured into the mold. There is a need. For this reason, several attempts have been made to reduce inclusions in the molten steel in the tundish.
【０００３】その一つは、溶鋼と介在物の比重差を利用
して介在物を浮上分離する方法である。しかし単に介在
物が自然に浮上するのを待つだけでは充分な効果は得ら
れない。そこでタンディッシュ中にガスを吹き込み、生
成した気泡によって、介在物の浮上を促進する方法が開
発された。その一つは、例えば特開昭５９−６３１３号
公報に記載されているような、タンディッシュ底部にガ
ス吹き込み用ノズルを配置して、該ノズルからガスを溶
鋼中に吹き込む方法である。またこの他に、材料とプロ
セス、ｖｏｌ．１ １９８８，１１６１にはタンディッ
シュ上部から溶鋼中に回転ノズルを浸漬し、ガスを吹き
込む方法も提案されている。これらの方法は、いずれも
タンディッシュ内の溶鋼中に吹き込んだ気泡が、溶鋼中
の介在物を捕捉して、溶鋼と介在物の比重差による浮上
速度よりも速い速度で浮上させる効果と、気泡の浮上に
より、溶鋼自体の流動が介在物の浮上に有利な方向にな
る効果とによって、介在物の浮上分離を促進しようとす
るものである。One of them is a method of floating and separating inclusions by utilizing the difference in specific gravity between molten steel and inclusions. However, simply waiting for the inclusions to surface naturally does not produce a sufficient effect. Therefore, a method has been developed in which gas is blown into the tundish and the bubbles generated promote the floating of inclusions. One of them is a method of disposing a gas blowing nozzle at the bottom of a tundish and blowing gas from the nozzle into the molten steel, as described in, for example, JP-A-59-6313. In addition to this, materials and processes, vol. 1 1988, 1161 also proposes a method of immersing a rotary nozzle in molten steel from the upper part of a tundish and blowing gas. All of these methods have the effect that the bubbles blown into the molten steel in the tundish capture the inclusions in the molten steel and levitate at a speed faster than the levitation speed due to the difference in specific gravity between the molten steel and inclusions. The floating of the molten steel itself tends to favor the floating of the inclusions, thereby promoting the floating separation of the inclusions.
【０００４】しかし、これらの方法は、ガス気泡が通過
した領域では効果があるが、吹き込み方法の制約上、タ
ンディッシュ内の全ての溶鋼にガス気泡が通過させるの
は困難で、従ってガス吹き込みの効果は十分とはいえな
かった。またいずれもそのための設備の設置、運用する
ために、経費がかかり作業面での負担も大きいという問
題点もあった。However, although these methods are effective in the region where the gas bubbles pass, it is difficult to allow the gas bubbles to pass through all the molten steel in the tundish due to the restriction of the blowing method, and therefore the gas blowing The effect was not sufficient. In addition, in both cases, there is a problem in that the installation and operation of the equipment for that purpose causes a cost and a heavy work load.
【０００５】このような問題点を解決する手段として、
取鍋からタンディッシュ内に溶鋼を注入する注入ノズル
からガスを吹き込み、落下中の溶鋼にガス気泡を混入さ
せる方法が開発された。この方法では、取鍋からタンデ
ィッシュに流出する溶鋼のほぼ全量にガス気泡を混入さ
せることができる。これらの技術については特開昭５０
−１２８６２４号公報、特開昭５７−１７７９１４号公
報に開示されている。As a means for solving such a problem,
A method has been developed in which gas is blown from a pouring ladle to inject molten steel into a tundish from a ladle, and gas bubbles are mixed into the falling molten steel. In this method, gas bubbles can be mixed into almost all of the molten steel flowing out from the ladle to the tundish. Regarding these techniques, Japanese Patent Laid-Open No. Sho 50
-128624 and JP-A-57-177914.
【０００６】[0006]
【発明が解決しようとする課題】しかし前記公報等で開
示されている内容は注入中の溶鋼にガスを吹き込むこと
は開示されているが、その最適条件は示されていない。However, although the contents disclosed in the above publications and the like disclose blowing gas into the molten steel being poured, the optimum conditions are not shown.
【０００７】注入ノズルを介して注入する場合、通常、
取鍋からの溶鋼注入流は流量制御のために取鍋直下に設
けたスライディングノズルで絞られており、そのため、
それ以降の注入ノズルの内部は負圧になっており、ベル
ヌイの方程式で推算するとほぼ真空状態になっていると
考えられる。そして注入ノズルの上部の内側は必ずしも
溶鋼によって充填されてはおらず、空隙が存在している
可能性が高い。この様な状態の注入ノズルにガスを吹き
込んだ場合には、ガスは溶鋼注入流の中に微細気泡とし
て混入せず、注入ノズル壁と溶鋼注入流との間にガスが
溜まり、このガスが周期的に溶鋼流によって押し出され
て、粗大な気泡を形成する。気泡の径が大きすぎたり、
ガスの吹き込み量が多すぎたりすると、タンデッシュ内
の溶鋼中を上昇した気泡が、タンデッシュ内溶鋼の表面
付近を攪拌して、かえって溶鋼表面付近に浮かんでいる
介在物を溶鋼中に巻き込んだり、通常はスラグで覆われ
ている溶鋼表面を露出させて溶鋼を酸化させてしまう。When injecting through an injection nozzle, usually,
The molten steel injection flow from the ladle is throttled by a sliding nozzle installed directly below the ladle to control the flow rate.
After that, the inside of the injection nozzle has a negative pressure, and it is considered that it is almost in a vacuum state when estimated by Bernoulli's equation. The inside of the upper part of the injection nozzle is not necessarily filled with molten steel, and it is highly possible that voids exist. When the gas is blown into the injection nozzle in such a state, the gas is not mixed as fine bubbles in the molten steel injection flow, and the gas is accumulated between the injection nozzle wall and the molten steel injection flow, and this gas is cycled. And is extruded by the molten steel flow to form coarse bubbles. The diameter of the bubbles is too large,
If the amount of gas blown in is too large, the bubbles rising in the molten steel in the tundish will stir near the surface of the molten steel in the tundish and, on the contrary, entrain inclusions floating near the surface of the molten steel into the molten steel. Exposes the surface of the molten steel covered with slag and oxidizes the molten steel.
【０００８】本発明者等は上記した問題点を解消し介在
物浮上に最適の吹き込み条件を見出すために種々考察研
究した結果、本発明を完成するに至ったものである。The present inventors have completed the present invention as a result of various studies and studies in order to solve the above problems and find the optimum blowing condition for floating inclusions.
【０００９】[0009]
【課題を解決するための手段】本発明の鋼の連続鋳造に
おける介在物の除去方法は、溶鋼を取鍋からタンディッ
シュへ注入ノズルを介して注入する際、注入中の溶鋼に
注入ノズルから不活性ガスを吹き込み、溶鋼中に不活性
ガス気泡を混入させた状態でタンディッシュ内に注入す
る介在物除去方法において、注入ノズルのタンディッシ
ュの湯面よりも上方１．４ｍ以内の位置の一部分を
（１）式で定義される透過率が１０-9〜７×１０-11 cm
2 のポーラス煉瓦で構成し、該ポーラス煉瓦を介して、
溶鋼１トン当たり０．５〜５０リットルの不活性ガスを
吹き込むことを特徴とする。The method for removing inclusions in the continuous casting of steel according to the present invention is such that when pouring molten steel from a ladle to a tundish through a pouring nozzle, the molten steel during pouring does not pass through the pouring nozzle. In the method of removing inclusions in which the active gas is blown and the inert gas bubbles are mixed in the molten steel and is injected into the tundish, a part of the position within 1.4 m above the molten metal surface of the tundish of the injection nozzle is The transmittance defined by the formula (1) is 10 −9 to 7 × 10 −11 cm.
Composed of 2 porous bricks, through the porous brick,
It is characterized by blowing 0.5 to 50 liters of an inert gas per ton of molten steel.
【００１０】 ｑ＝( ｋ・Ｓ・△Ｐ) ／( η・Ｌ) ・・・・・・（１） ｑ：透過ガス流量（cm3 ／ｓｅｃ） ｋ：ポーラス煉瓦の透過率（cm2 ） Ｓ：ガス透過面積（cm2 ） △Ｐ：注入用ノズル内と吹き込みガスの差圧（ｄｙｎ／
cm2 ） η：吹き込みガスの粘度（ｄｙｎ・ｓｅｃ／cm2 ) Ｌ：ポーラス煉瓦の厚さ（ｃｍ）Q = (k · S · ΔP) / (η · L) (1) q: Permeate gas flow rate (cm 3 / sec) k: Permeability of porous brick (cm 2 ). S: Gas permeation area (cm 2 ) ΔP: Differential pressure between the injection nozzle and the blown gas (dyn /
cm 2 ) η: Viscosity of blown gas (dyn · sec / cm 2 ) L: Thickness of porous brick (cm)
【００１１】[0011]
【作用】発明者等の検討によれば、注入ノズルでのガス
吹き込みに最適なポーラス煉瓦の透過率は１０-9〜７×
１０-11 cm2 である。透過率が１０-9よりも大きいと、
ポーラス煉瓦内の気孔の大きい部分から優先的にガスが
流れやすく、生成するガス気泡が大きくなったり、溶鋼
中のガス気泡が偏在したりして、十分な介在物浮上促進
効果がえられない。また、透過率が７×１０-11cm2より
も小さいと、ガス透過に対する抵抗が大きく、必要なガ
ス気泡を吹き込むことができない。According to the study by the inventors, the optimum permeability of the porous brick for gas injection from the injection nozzle is 10 −9 to 7 ×.
It is 10 -11 cm 2 . If the transmittance is greater than 10 -9 ,
The gas easily flows preferentially from the large pores in the porous brick, the generated gas bubbles become large, and the gas bubbles in the molten steel are unevenly distributed, so that a sufficient effect of promoting the floating of inclusions cannot be obtained. If the transmittance is less than 7 × 10 -11 cm 2, the resistance to gas permeation is high and the necessary gas bubbles cannot be blown.
【００１２】溶鋼中への最適ガス吹き込み量は、通過溶
鋼１トン当たり０．５〜５０リットルである。０．５リ
ットル／トンよりも少ないと、生成するガス気泡の量が
少なく、実質的に介在物浮上分離効果はない。しかし５
０リットル／トンよりもガス量が多いと、ガス気泡の合
体が発生しやすくなり、ガス気泡の粗大化により介在物
捕捉効果は低下し、またタンディッシュ溶鋼表面の露出
などが起こりやすくなる。The optimum amount of gas blown into the molten steel is 0.5 to 50 liters per ton of molten steel passing through. If it is less than 0.5 liter / ton, the amount of gas bubbles generated is small, and there is substantially no effect of floating inclusion separation. But 5
If the amount of gas is greater than 0 liter / ton, coalescence of gas bubbles is likely to occur, the inclusion trapping effect is reduced due to the coarsening of gas bubbles, and the surface of the molten steel tundish is likely to be exposed.
【００１３】また、注入用ノズルのタンディッシュの湯
面高さよりも上方１．４ｍ以内の位置の一部をポーラス
煉瓦で構成し、そこをガス吹き込み位置とすることによ
り、吹き込んだガスが確実に微細気泡となって溶鋼中に
混入される。タンディッシュ湯面からポーラス煉瓦設置
位置までの距離が１．４ｍ以内であれば、ノズル内部が
負圧になっても、ノズル内部は落下する溶鋼によって完
全に充填されているので、ガスを容易に溶鋼中に混入さ
せることができる。Further, a part of a position within 1.4 m above the level of the molten metal of the tundish of the injection nozzle is made of porous brick, and the gas is blown in by ensuring that it is a gas blowing position. Fine bubbles are mixed in the molten steel. If the distance from the tundish surface to the porous brick installation position is 1.4 m or less, even if the inside of the nozzle becomes a negative pressure, the inside of the nozzle is completely filled with molten steel that falls, so gas can be easily supplied. It can be mixed in molten steel.
【００１４】[0014]
【実施例】本発明の一実施例を図面を用いて説明する。
図１は本発明の一実施例を示す概念図である。図２は、
本実施例における取鍋の注入ノズルの構成を示す断面図
である。図において、１は取鍋、２は注入ノズル、３は
タンディッシュ、４は溶鋼、５は連続鋳造用鋳型、６は
ポーラス煉瓦、７はアルゴンガス配管、８はガス流路で
ある。溶鋼は取鍋１から注入ノズル２によって、タンデ
ィッシュ３内に注入され、更にタンディッシュ３から浸
漬ノズル９により鋳型５内に注入され、鋳型５内及びそ
の下部の図示されない二次冷却帯において、外周部から
内部に向かって凝固し鋳片が形成される。本実施例では
不活性ガスとしてアルゴンガスを用い、注入ノズル２の
タンディッシュ３の湯面からの距離Ｈが１．２ｍ上方の
１部をポーラス煉瓦６で構成し、注入ノズル２の上部に
取り付けたアルゴンガス配管７から、注入ノズル２の内
部に形成されたガス流路８を経て、２０（リットル／溶
鋼トン）のアルゴンガスを流した。ポーラス煉瓦の透過
率は１．２×１０-10 cm2 であったAn embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram showing an embodiment of the present invention. Figure 2
It is sectional drawing which shows the structure of the injection nozzle of the ladle in a present Example. In the figure, 1 is a ladle, 2 is an injection nozzle, 3 is a tundish, 4 is molten steel, 5 is a casting mold for continuous casting, 6 is a brick brick, 7 is an argon gas pipe, and 8 is a gas passage. Molten steel is injected from the ladle 1 into the tundish 3 by the injection nozzle 2 and further into the mold 5 from the tundish 3 by the dipping nozzle 9, and in the mold 5 and a secondary cooling zone (not shown) below the mold 5. A slab is formed by solidifying from the outer peripheral portion toward the inside. In this embodiment, argon gas is used as an inert gas, and a part of the injection nozzle 2 whose distance H from the molten metal surface of the tundish 3 is 1.2 m is made up of a porous brick 6 and attached to the upper part of the injection nozzle 2. From the argon gas pipe 7, 20 (liter / ton of molten steel) argon gas was caused to flow through the gas passage 8 formed inside the injection nozzle 2. The transmittance of the porous brick was 1.2 × 10 -10 cm 2 .
【００１５】Ｃ：０．１５％、Ｓｉ：０．３０％、Ｍ
ｎ：０．７％、Ｐ：０．０２％、Ｓ：０．０１５％の組
成の炭素鋼の溶鋼を第１図に示す装置で鋳造した。取鍋
１の溶鋼量は２５０トン、タンディッシュ３の容量は５
０トン、鋳造ストランドは２本、鋳造された鋳片の寸法
は２２０ｍｍ×１６００ｍｍである。取鍋１内、鋳型５
内と鋳片から試料を採取し、酸素分析及び介在物調査を
行った。その結果取鍋１内の溶鋼の全酸素量は３０ｐｐ
ｍであるのに、本発明実施後の鋳型５内の溶鋼の全酸素
量は１２ｐｐｍであり、従って本発明により全酸素量で
１８ｐｐｍに相当する介在物がタンディッシュ３内で浮
上分離した。また鋳片のアルミナ系介在物個数は、本発
明を実施しない場合の７０％に減少した。C: 0.15%, Si: 0.30%, M
Molten carbon steel having a composition of n: 0.7%, P: 0.02% and S: 0.015% was cast by the apparatus shown in FIG. The ladle 1 has 250 tons of molten steel, and the tundish 3 has a capacity of 5
0 ton, two cast strands, and the size of the cast slab is 220 mm × 1600 mm. Inside the ladle 1, mold 5
Samples were taken from inside and from the slab, and oxygen analysis and inclusion investigation were performed. As a result, the total oxygen content of molten steel in ladle 1 is 30 pp
m, the total oxygen content of the molten steel in the mold 5 after carrying out the present invention was 12 ppm. Therefore, according to the present invention, inclusions corresponding to the total oxygen content of 18 ppm were floated and separated in the tundish 3. Moreover, the number of alumina-based inclusions in the cast slab was reduced to 70% of that in the case where the present invention was not carried out.
【００１６】本発明は特に、タンディッシュでの溶鋼滞
留時間が短く、かつ鋳型内での介在物浮上が期待しにく
い高速鋳造（鋳造速度が２ｍ／分以上）での、鋳片の介
在物除去に多大の効果を発揮する。The present invention is particularly applicable to removal of inclusions in a slab in high-speed casting (casting speed is 2 m / min or more) in which the molten steel residence time in the tundish is short and inclusion floating in the mold is unlikely to be expected. Exerts a great effect on.
【００１７】[0017]
【発明の効果】本発明により、タンディッシュにおいて
溶鋼中のアルミナ系介在物を効果的に浮上分離除去する
ことができ、品質的に優れた連続鋳造鋳片を製造するこ
とが可能となった。According to the present invention, alumina-based inclusions in molten steel can be effectively floated and removed in a tundish, and a continuous cast slab with excellent quality can be manufactured.
【図１】本発明の一実施例を示す概念図である。FIG. 1 is a conceptual diagram showing an embodiment of the present invention.
【図２】本発明の実施例における取鍋の注入ノズルの構
成を示す断面図である。FIG. 2 is a cross-sectional view showing the structure of a pouring nozzle of a ladle according to an embodiment of the present invention.
１ 取鍋 ２ 注入ノズル ３ タンディッシュ ４ 溶鋼 ５ 連続鋳造用鋳型 ６ ポーラス煉瓦 ７ アルゴンガス配管 ８ ノズル内部のガス流路 ９ 浸漬ノズル 1 Ladle 2 Pouring Nozzle 3 Tundish 4 Molten Steel 5 Continuous Casting Mold 6 Porous Brick 7 Argon Gas Pipe 8 Gas Flow Inside Nozzle 9 Immersion Nozzle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西町 龍三 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuzo Nishimachi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.
Claims (1)
介して注入する際、注入中の溶鋼に注入ノズルから不活
性ガスを吹き込み、溶鋼中に不活性ガス気泡を混入させ
た状態でタンディッシュ内に注入する介在物除去方法に
おいて、注入ノズルのタンディッシュの湯面よりも上方
１．４ｍ以内の位置の一部分を（１）式で定義される透
過率が１０-9〜７×１０-11 cm2 のポーラス煉瓦で構成
し、該ポーラス煉瓦を介して、溶鋼１トン当たり０．５
〜５０リットルの不活性ガスを吹き込むことを特徴とす
る鋼の連続鋳造における介在物の除去方法。 ｑ＝( ｋ・Ｓ・△Ｐ) ／( η・Ｌ) ・・・・・（１） ｑ：透過ガス流量（cm3 ／ｓｅｃ） ｋ：ポーラス煉瓦の透過率（cm2) Ｓ：ガス透過面積（cm2) △Ｐ：注入用ノズル内と吹き込みガスの差圧（ｄｙｎ／
cm2) η：吹き込みガスの粘度（ｄｙｎ・ｓｅｃ／cm2) Ｌ：ポーラス煉瓦の厚さ（ｃｍ）1. When pouring from a ladle into a tundish through a pouring nozzle, an inert gas is blown from the pouring nozzle into the molten steel during pouring, and an inert gas bubble is mixed into the molten steel to fill the inside of the tundish. In the method of removing inclusions, the part of the position within 1.4 m above the level of the tundish of the injection nozzle has a transmittance defined by the formula (1) of 10 -9 to 7 × 10 -11 cm 2. It is composed of 2 porous bricks and 0.5 per ton of molten steel is passed through the porous brick.
A method for removing inclusions in continuous casting of steel, which comprises blowing in an inert gas of up to 50 liters. q = (k ・ S ・ ΔP) / (η ・ L) (1) q: Permeate gas flow rate (cm 3 / sec) k: Permeability of porous brick (cm 2 ) S: Gas permeation Area (cm 2 ) ΔP: Differential pressure between the inside of the injection nozzle and the blown gas (dyn /
cm 2 ) η: Viscosity of blown gas (dyn · sec / cm 2 ) L: Thickness of porous brick (cm)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35544693A JP3216384B2 (en) | 1993-12-30 | 1993-12-30 | Method for removing inclusions in continuous casting of steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35544693A JP3216384B2 (en) | 1993-12-30 | 1993-12-30 | Method for removing inclusions in continuous casting of steel |
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| Publication Number | Publication Date |
|---|---|
| JPH07195161A true JPH07195161A (en) | 1995-08-01 |
| JP3216384B2 JP3216384B2 (en) | 2001-10-09 |
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| JP35544693A Expired - Fee Related JP3216384B2 (en) | 1993-12-30 | 1993-12-30 | Method for removing inclusions in continuous casting of steel |
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| CN102847899A (en) * | 2012-09-19 | 2013-01-02 | 中冶南方工程技术有限公司 | Method for improving cleanliness of casting blank |
| WO2013172613A1 (en) * | 2012-05-14 | 2013-11-21 | 주식회사 포스코 | High cleanliness molten steel production method and refining device |
| KR101356928B1 (en) * | 2012-05-14 | 2014-01-28 | 주식회사 포스코 | Method of manufacturing high purity molten steel and the refining device thereof |
| KR20180094235A (en) | 2017-02-15 | 2018-08-23 | 주식회사 포스코 | Method for treatment of molten steel |
| CN115198055A (en) * | 2022-06-16 | 2022-10-18 | 莱芜钢铁集团银山型钢有限公司 | Continuous casting tundish turbulence controller with argon blowing function and preparation method thereof |
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| CN102847899A (en) * | 2012-09-19 | 2013-01-02 | 中冶南方工程技术有限公司 | Method for improving cleanliness of casting blank |
| KR20180094235A (en) | 2017-02-15 | 2018-08-23 | 주식회사 포스코 | Method for treatment of molten steel |
| CN115198055A (en) * | 2022-06-16 | 2022-10-18 | 莱芜钢铁集团银山型钢有限公司 | Continuous casting tundish turbulence controller with argon blowing function and preparation method thereof |
| CN115198055B (en) * | 2022-06-16 | 2023-06-09 | 莱芜钢铁集团银山型钢有限公司 | Continuous casting tundish turbulence controller with argon blowing function and preparation method thereof |
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|---|---|
| JP3216384B2 (en) | 2001-10-09 |
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