JP2013193122A - Tundish for continuous casting - Google Patents
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- JP2013193122A JP2013193122A JP2012065838A JP2012065838A JP2013193122A JP 2013193122 A JP2013193122 A JP 2013193122A JP 2012065838 A JP2012065838 A JP 2012065838A JP 2012065838 A JP2012065838 A JP 2012065838A JP 2013193122 A JP2013193122 A JP 2013193122A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 238000004891 communication Methods 0.000 claims description 28
- 238000007654 immersion Methods 0.000 claims description 15
- 206010016717 Fistula Diseases 0.000 claims description 4
- 230000003890 fistula Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 10
- 230000003749 cleanliness Effects 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract 6
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 235000007164 Oryza sativa Nutrition 0.000 abstract 1
- 235000009566 rice Nutrition 0.000 abstract 1
- 238000007667 floating Methods 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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Abstract
Description
本発明は介在物の浮上効果に優れた、平面内郭形状がお結び形（三角形または三つの長辺を曲線あるいはそれぞれ複数の直線あるいはそれぞれ一つの直線で連結した形状）の連続鋳造用２ストランドタンディッシュに関するものである。 The present invention is excellent in the floating effect of inclusions, and has two plane strands for continuous casting having a knotted shape (triangle or three long sides connected by a curved line, a plurality of straight lines, or a single straight line). It is about tundish.
連続鋳造は、転炉や二次精錬設備で溶製された溶鋼を、取鍋からロングノズルを介してタンディッシュに注湯し、一定レベルまで貯留した後、この溶鋼を、浸漬ノズルを介して鋳型に供給して冷却し、鋳片を製造する技術である。
この連続鋳造によって鋳片を製造する際、溶鋼がタンディッシュを通過する間に雰囲気ガスや耐火物ライニングと接触し、ガス吸収やライニング材の溶出等によって汚染され易い。また、取鍋からタンディッシュに供給された溶鋼には、精錬反応によって生成したＡｌ２Ｏ３等の介在物が溶鋼から除去されずに残留していることもある。
In continuous casting, molten steel melted in a converter or secondary refining equipment is poured into a tundish from a ladle through a long nozzle and stored to a certain level, and then this molten steel is passed through an immersion nozzle. This is a technique for producing a slab by supplying it to a mold and cooling it.
When producing a slab by this continuous casting, the molten steel comes into contact with the atmospheric gas or the refractory lining while passing through the tundish, and is easily contaminated by gas absorption or elution of the lining material. In addition, inclusions such as Al 2 O 3 generated by the refining reaction may remain in the molten steel supplied from the ladle to the tundish without being removed from the molten steel.
ところで、溶鋼に含有される介在物は、鋳造時には浸漬ノズル等を閉塞させる原因となり、鋳造条件を不安定にするとともに、介在物が連鋳スラブに持ち込まれると、鋳片の清浄度が低下し、後続する圧延段階で疵発生原因となり、歩留まりを低下させる。
そこで、従来から、鋳片の清浄度を高めるために、タンディッシュ内の溶鋼に含まれている介在物を除去するための種々の提案がなされている。
その一つとして、所謂、Ｔ型２ストランドタンディッシュのように、タンディシュの形状や特殊堰の設置により、溶鋼のパスラインを強制的にＴ型とすることで、パスラインを長くし介在物の浮上分離性を高めることが提案されている。
By the way, inclusions contained in the molten steel cause clogging of the immersion nozzle and the like during casting, making the casting conditions unstable, and if inclusions are brought into the continuous casting slab, the cleanliness of the slab is lowered. In the subsequent rolling stage, it causes wrinkles and reduces the yield.
Therefore, conventionally, various proposals for removing inclusions contained in the molten steel in the tundish have been made in order to increase the cleanliness of the slab.
As one of them, like the so-called T-type two-strand tundish, by setting the shape of the tundish and special dams, the pass line of the molten steel is forced to be T-shaped, so that the pass line is lengthened and the inclusions are It has been proposed to increase floating separation.
例えば、特許文献１には、Ｔ型２ストランドタンディッシュにおいて、取鍋からの溶鋼を装入する注入室と該注入室の溶鋼を連続鋳造鋳型に装入する分配室とを備え、この注入室と分配室とを仕切る仕切堰を設け、この仕切堰の形状を最適化することにより、微細な介在物についても浮上分離可能とすることが開示されている。 For example, Patent Document 1 includes, in a T-type two-strand tundish, an injection chamber for charging molten steel from a ladle and a distribution chamber for charging molten steel in the injection chamber into a continuous casting mold. It is disclosed that by providing a partition weir for partitioning the distribution chamber and optimizing the shape of the partition weir, fine inclusions can be levitated and separated.
また、特許文献２には、取鍋からの溶鋼を装入する注入室と前記注入室の溶鋼を鋳型に装入する分配室とを備える容量が１０〜３０ｔｏｎの２ストランドのＴ型タンディッシュにおいて、分配室の半幅と注入室の半幅との関係を適正化し、タンディッシュ凹部の半幅とノズル孔距離との関係を適正化し、分配室の奥行きと凹部の長さとの関係を適正化し、さらに、注入室の半幅と凹部の半幅と分配室１１の奥行きとの関係を適正化することにより、介在物の浮上分離性を改善することが開示されている。 Further, Patent Document 2 discloses a two-strand T-type tundish having a capacity of 10 to 30 tons including an injection chamber for charging molten steel from a ladle and a distribution chamber for charging molten steel in the injection chamber into a mold. , Optimize the relationship between the half width of the distribution chamber and the half width of the injection chamber, optimize the relationship between the half width of the tundish recess and the nozzle hole distance, optimize the relationship between the depth of the distribution chamber and the length of the recess, It is disclosed that the floating separation property of inclusions is improved by optimizing the relationship between the half width of the injection chamber, the half width of the recess, and the depth of the distribution chamber 11.
上記特許文献１、２に記載されるようなＴ型２ストランドタンディッシュにおいては、溶鋼のパスラインがＴ型であるためタンディッシュ内のスペースを有効に活用したパスラインとなっているが、逆に、パスラインをＴ型に強制するために、ロングノズル付近を中絞り形状にする必要があった。これによりタンディッシュ容量を大きくすることができず、介在物浮上効果が小さいという問題があった。
そこで２ストランドタンディッシュの介在物浮上分離機能を改善するためには、タンディッシュの容量拡大が望まれるが、同時に、拡大したスペースを有効に活用し、介在物浮上分離効果を高めることができるような溶鋼パスラインの設計が必要となる。
In the T-type two-strand tundish as described in Patent Documents 1 and 2 above, the pass line of the molten steel is a T-type, so the pass line effectively utilizes the space in the tundish. In addition, in order to force the pass line to be T-shaped, it is necessary to make the vicinity of the long nozzle into a medium-drawing shape. As a result, the tundish capacity cannot be increased, and the inclusion floating effect is small.
Therefore, in order to improve the inclusion floating function of the two-strand tundish, it is desirable to expand the capacity of the tundish. At the same time, the expanded space can be effectively used to enhance the inclusion floating effect. A new molten steel pass line is required.
本発明は、上記従来技術の課題解決を目的としてなされたものであって、連続鋳造用２ストランドタンディッシュにおいて、大容量であって、しかも、介在物の浮上分離効果に優れ、清浄度の高い鋳片を得ることができるような連続鋳造用２ストランドタンディッシュを提供することを目的とする。 The present invention has been made for the purpose of solving the problems of the prior art described above, and has a large capacity in a two-strand tundish for continuous casting, and is excellent in the floating separation effect of inclusions and has a high cleanliness. It aims at providing the 2 strand tundish for continuous casting which can obtain a slab.
本発明は、タンディッシュの大容量化を図るとともに、大容量化した分のスペースを有効活用し介在物の浮上分離効果を最大限発揮させるべく、連続鋳造用２ストランドタンディッシュの形状及び構造について鋭意研究したものであって、まず連続鋳造用２ストランドタンディッシュの平面内郭形状を従来のようなＴ型（図１参照）ではなく、お結び型（三角形または三つの長辺を曲線あるいはそれぞれ複数の直線あるいはそれぞれ一つの直線で連結した形状）（図２参照）に変更してタンディッシュを大容量化したものである。 The present invention relates to the shape and structure of a two-strand tundish for continuous casting in order to increase the capacity of the tundish and to make the best use of the space for the increased capacity and to maximize the effect of floating separation of inclusions. First, the two-sided tundish for continuous casting is not a T-shape (see Fig. 1), but a knot-type (triangle or three long sides curved or The tundish is increased in capacity by changing the shape to a plurality of straight lines or shapes each connected by one straight line (see FIG. 2).
また、本発明は、タンディッシュを大容量化し、その平面内郭形状を六角形状とした際に、タンディッシュの受湯部と注湯部との間に堰を形成し、この堰によって溶鋼のパスラインを適正に維持し、これによって、介在物の浮上分離を効果的に行うものである。 Further, according to the present invention, when the capacity of the tundish is increased and the planar inner shape thereof is a hexagonal shape, a weir is formed between the hot water receiving portion and the pouring portion of the tundish, and the weir of the molten steel is formed by this weir. By properly maintaining the pass line, the floating separation of the inclusions is effectively performed.
また、本発明は、上記堰に、受湯部と注湯部を連通させ、溶鋼を通す連通孔を設けることにより、介在物の浮上分離をより効果的に行うものである。 Moreover, this invention makes the said dam communicate with a hot water receiving part and a pouring part, and provides the communicating hole which lets molten steel pass, and performs floating separation of inclusion more effectively.
また、本発明は、上記連通孔と堰の合計断面積を、定常状態の溶鋼流路断面積以上と定めることにより、介在物の浮上分離をより効果的に行うものである。 In addition, according to the present invention, inclusions are separated and floated more effectively by setting the total cross-sectional area of the communication hole and the weir to be equal to or greater than the steady-state molten steel channel cross-sectional area.
さらに、本発明は、上記堰の適正位置に連通孔の設置位置を定めることにより、介在物の浮上分離効果を最大限に発揮させるものである。 Furthermore, the present invention makes it possible to maximize the effect of floating separation of inclusions by determining the installation position of the communication hole at the appropriate position of the weir.
本発明は、上述したところを特徴とする大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュであって、
「（１） 取鍋からロングノズルを介して溶鋼を受け入れる受湯部と、浸漬ノズルを介して該溶鋼を鋳型に注湯する注湯部とを備え、ロングノズルの中心と浸漬ノズルの中心が一直線上に並んでいない連続鋳造用２ストランドタンディッシュにおいて、
該タンディッシュの平面内郭形状はお結び型（三角形または三つの長辺を曲線あるいはそれぞれ複数の直線あるいはそれぞれ一つの直線で連結した形状）であり、上記受湯部と注湯部との間には堰が形成され、上記タンディッシュの内郭を構成する辺と上記堰によって平面形状がほぼ台形あるいは三角形の上記受湯部が構成され、また、上記タンディッシュの内郭を構成する残りの辺と上記堰によって平面形状がほぼ長方形の上記注湯部が構成され、上記堰には受湯部と注湯部を連通する連通孔が設けられ、上記連通孔と堰の合計断面積は定常状態の溶鋼流路断面積以上であることを特徴とする大容量かつ平面内郭形状がお結び型（三角形または三つの長辺を曲線あるいはそれぞれ複数の直線あるいはそれぞれ一つの直線で連結した形状）の連続鋳造用２ストランドタンディッシュ。
（２） 上記堰には、複数の連通孔が設けられていることを特徴とする前記（１）に記載の大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュ。
（３） 上記堰の下方のコーナー部あるいはコーナー近傍には、鼠孔が設けられていることを特徴とする前記（１）または（２）に記載の大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュ。
（４） 上記連通孔の最上端から定常状態の溶鋼表面までの距離は、１００〜１５０ｍｍであることを特徴とする前記（１）乃至（３）のいずれかに記載の大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュ。」
との構成を備えるものである。
The present invention is a two-strand tundish for continuous casting having a large capacity and a planar inner shape characterized as described above,
“(1) A hot water receiving part for receiving molten steel from a ladle through a long nozzle and a pouring part for pouring the molten steel into a mold through an immersion nozzle, the center of the long nozzle and the center of the immersion nozzle being In a two-strand tundish for continuous casting that is not aligned,
The plane inner shape of the tundish is a knot type (a triangle or three long sides connected by a curved line, a plurality of straight lines, or a single straight line), between the hot water receiving part and the pouring part. The weir is formed, and the side of the tundish that forms the inner wall of the tundish and the weir constitutes the hot water receiving portion having a substantially trapezoidal or triangular shape, and the remaining side that forms the inner surface of the tundish The pouring part having a substantially rectangular planar shape is constituted by the weir, and the weir is provided with a communication hole for communicating the hot water receiving part and the pouring part. The total cross-sectional area of the communication hole and the weir is in a steady state. A large-capacity and flat inner shape characterized by a cross-sectional area of the molten steel flow path is a knot type (a triangle or three long sides connected by a curved line or multiple straight lines or a single straight line) 2 strand tundish for continued casting.
(2) The two-strand tundish for continuous casting having a large-capacity and planar inner shape as described in (1), wherein the dam is provided with a plurality of communication holes.
(3) A large-capacity and planar inner shape as described in (1) or (2) above is characterized in that a fistula is provided in the corner portion or near the corner below the weir. 2 strand tundish for continuous casting.
(4) The large-capacity and planar outline according to any one of (1) to (3) above, wherein the distance from the uppermost end of the communication hole to the molten steel surface in a steady state is 100 to 150 mm 2-strand tundish for continuous casting with a knotted shape. "
It is equipped with the structure.
本発明は、連続鋳造用２ストランドタンディッシュの平面内郭形状をお結び型（三角形または三つの長辺を曲線あるいはそれぞれ複数の直線あるいはそれぞれ一つの直線で連結した形状）にすることにより、タンディッシュの大容量化を図ることが出来る。そして、これによってタンディッシュ内のスペースが増え介在物が浮上するまでの平均滞留時間が増大し介在物の浮上分離機能を高めることが出来る。
また、本発明は、タンディッシュの受湯部と注湯部との間には堰を形成し、これによって溶鋼のパスラインを適正化することができ、さらに堰の適正位置に受湯部と注湯部とを連通する連通孔を設けることによって、介在物の浮上分離を効果的に行うことが出来るので、製造される鋳片には介在物の混入がなく、清浄かつ均質な鋳片を得ることができる。
In the present invention, the planar inner shape of the two-strand tundish for continuous casting is formed as a knotted shape (a shape in which a triangle or three long sides are connected by a curved line, a plurality of straight lines, or a single straight line). The capacity of the dish can be increased. As a result, the space in the tundish increases and the average residence time until inclusions rise, and the floating separation function of inclusions can be enhanced.
Moreover, the present invention forms a weir between the hot water receiving part and the pouring part of the tundish, thereby making it possible to optimize the pass line of the molten steel, and further to the hot water receiving part at an appropriate position of the weir. By providing a communication hole that communicates with the pouring part, it is possible to effectively separate and lift the inclusions, so that the manufactured slab is free of inclusions and a clean and homogeneous slab is required. Can be obtained.
添付した図面を参照しつつ、本発明について詳述する。 The present invention will be described in detail with reference to the accompanying drawings.
図１に従来のＴ型２ストランドタンディッシュの平面概観図を、また、図２に本発明の一例として、大容量かつ平面内郭形状がお結び型（三つの長辺をそれぞれ一つの直線で連結した六角形形状）の連続鋳造用２ストランドタンディッシュを示す。
図１に示すように、従来のＴ型２ストランドタンディッシュ２１は、取鍋からロングノズル２４を介して溶鋼を受け入れる受湯部２２と、浸漬ノズル２５，２５’を介して該溶鋼を鋳型に注湯する注湯部２３とを備え、その平面形状は、受湯部２２が短辺２６と二つの側辺２７（縦側辺２７ａと横側辺２７ｂからなる），２７’（縦側辺２７ａ’と横側辺２７ｂ’からなる）で囲まれたほぼ長方形の領域として形成され、また、注湯部２３は、長辺２９と二つの側辺２８，２８’で囲まれたほぼ方形の領域として形成されている。
ロングノズル２４を介して受湯部２２に供給された溶鋼は、図中の矢印で示すパスラインｆ１→ｆ２に沿って流れ、注湯部２３において二方向のｆ３，ｆ３’に分岐し、それぞれの浸漬ノズル２５，２５’を経由して鋳型に流れ込む。そして、溶鋼がパスラインに沿って流れる間に、溶鋼中に含有されている介在物は浮上し分離される。
しかし、上記従来のＴ型２ストランドタンディッシュ２１では、受湯部２２から注湯部２３への溶鋼の流れｆ１→ｆ２が二つの縦側辺２７ａ，２７ａ’で規制されていることによって適正なパスラインが維持されているのであって、仮に、従来のＴ型２ストランドタンディッシュ２１において、大容量化を図ろうとして、受湯部２２の側壁を構成する二つの側辺２７，２７’を左右に拡げた場合には、溶鋼の適正なパスラインを形成することができなくなり、その結果として、介在物の浮上分離が上手くいかず、鋳片への介在物の混入を招くという事態が生じる。
このようは欠点を解消したのが、本発明の大容量かつ平面内郭形状がお結び型（例えば、六角形形状）の連続鋳造用２ストランドタンディッシュである。
Fig. 1 shows a plan view of a conventional T-type two-strand tundish. Fig. 2 shows an example of the present invention. A two-strand tundish for continuous casting having a hexagonal shape connected to each other is shown.
As shown in FIG. 1, a conventional T-type two-strand tundish 21 has a hot water receiving portion 22 for receiving molten steel from a ladle via a long nozzle 24, and the molten steel as a mold via immersion nozzles 25 and 25 '. The pouring part 23 is provided with a pouring part 23 for pouring hot water. The hot water receiving part 22 has a short side 26 and two side sides 27 (a longitudinal side 27a and a lateral side 27b), 27 '(a longitudinal side). 27a ′ and a lateral side 27b ′), and the pouring part 23 is a substantially rectangular region surrounded by a long side 29 and two side sides 28, 28 ′. It is formed as a region.
Molten steel supplied to受湯portion 22 through the long nozzle 24 flows along the pass line f 1 → f 2 indicated by the arrow in the figure, two-way f 3 in the pouring part 23, the f 3 ' It branches and flows into the mold via the respective immersion nozzles 25 and 25 '. And while the molten steel flows along a pass line, the inclusions contained in the molten steel are levitated and separated.
However, in the conventional T-type two-strand tundish 21, the flow f 1 → f 2 of the molten steel from the hot water receiving portion 22 to the pouring portion 23 is restricted by the two vertical sides 27 a and 27 a ′. Since an appropriate pass line is maintained, in the conventional T-type two-strand tundish 21, in order to increase the capacity, the two sides 27 and 27 constituting the side wall of the hot water receiving portion 22 are used. If 'is expanded to the left and right, it will not be possible to form an appropriate pass line for molten steel, and as a result, the floating separation of inclusions will not be successful and will lead to inclusion of inclusions in the slab Occurs.
In this way, the two-strand tundish for continuous casting having a large-capacity and planar inner shape of the knot type (for example, hexagonal shape) has been solved.
図２は、本発明の一例としての、大容量かつ平面内郭形状がお結び型（図２（ａ）は、三つの長辺をそれぞれ一つの直線で連結した六角形形状からなるお結び型）の連続鋳造用２ストランドタンディッシュの平面概観図である。
本発明の大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュ（以下、単に、「本発明タンディッシュ」という）１は、取鍋からロングノズル４を介して溶鋼を受け入れる受湯部２と、浸漬ノズル５を介して該溶鋼を鋳型に注湯する注湯部３とを備えており、ロングノズル４の中心と浸漬ノズル５の中心が一直線上に並んでいない２ストランドタンディッシュである。
本発明タンディッシュの平面内郭形状は、短辺６と二つの斜辺７，７’と二つの側辺８，８’と長辺９で形成される六角形形状となっており、図１に示される前記従来のＴ型２ストランドタンディッシュ２１における側辺２７の縦側辺２７ａと横側辺２７ｂ、および側辺２７’の縦側辺２７ａ’と横側辺２７ｂ’を、ほぼ斜め方向に拡張した形状に相当する。
本発明では、タンディッシュの平面内郭形状をこのような六角形とすることによって、タンディッシュ、特に、受湯部２、の大容量化を図っており、これによって、タンディッシュ内のスペースが増え介在物が浮上するまでの平均滞留時間が増大し介在物の浮上分離機能を高めることが出来る。
FIG. 2 shows an example of the present invention, a large-capacity and planar inner shape is a knot type (FIG. 2A is a knot type consisting of a hexagonal shape in which three long sides are connected by one straight line. 2) is a schematic plan view of a two-strand tundish for continuous casting.
The two-strand tundish for continuous casting (hereinafter simply referred to as “the present invention tundish”) 1 having a large capacity and a flat inner shape of the present invention receives molten steel from a ladle through a long nozzle 4. 2 strands having a hot water receiving part 2 and a pouring part 3 for pouring the molten steel into a mold via an immersion nozzle 5, and the center of the long nozzle 4 and the center of the immersion nozzle 5 are not aligned in a straight line It is a tundish.
The plane inner shape of the tundish of the present invention is a hexagonal shape formed by a short side 6, two oblique sides 7, 7 ', two side sides 8, 8', and a long side 9, as shown in FIG. In the conventional T-shaped two-strand tundish 21 shown, the longitudinal side 27a and the lateral side 27b of the lateral side 27 and the longitudinal side 27a 'and the lateral side 27b' of the lateral side 27 'are substantially inclined. Corresponds to an expanded shape.
In the present invention, the tundish, in particular, the hot water receiving portion 2 has a large capacity by making the planar inner shape of the tundish into such a hexagonal shape, whereby the space in the tundish is reduced. The average residence time until the increased inclusions rise and the floating separation function of inclusions can be enhanced.
そして、本発明タンディッシュでは、前記一つの斜辺７と一つの側辺８の交点と、残りの他の斜辺７’と残りの他の側辺８’の交点とをほぼ結ぶように、堰１０を設け、堰１０によってタンディッシュの受湯部２と注湯部３とを区画形成する。
言い方を変えれば、受湯部２は、短辺６と二つの斜辺７，７’と堰１０によって囲まれたほぼ台形状の領域として区画形成され、また、注湯部３は、長辺９と二つの側辺８，８’と堰１０によって囲まれたほぼ長方形の領域として区画形成される。
なお、上記でいう斜辺７と側辺８の交点、あるいは、斜辺７’と側辺８’の交点とは、厳密な意味での交点である必要はなく、斜辺７と側辺８の交点近傍、あるいは、斜辺７’と側辺８’の交点近傍であればよい。
つまり、上記のように区画形成された本発明タンディッシュでは、受湯部２の領域が、従来のＴ型２ストランドタンディッシュの受湯部の領域より拡大されているが、それによって、タンディッシュ内の溶鋼流が乱されず介在物の浮上分離効果に悪影響を及ぼさないという条件が満たされておれば、堰１０の先端は斜辺７と側辺８の交点近傍、あるいは、斜辺７’と側辺８’の交点近傍であればよい。
本発明では、受湯部２が、短辺６と二つの斜辺７，７’と堰１０によって囲まれたほぼ台形状の領域として区画形成されていることによって、従来のＴ型２ストランドタンディッシュの受湯部に比してその領域が拡大され、ひいては、タンディッシュの大容量化が図られている。
In the tundish of the present invention, the weir 10 is so connected that the intersection of the one oblique side 7 and the one side 8 and the intersection of the remaining other oblique side 7 'and the remaining other side 8' are substantially connected. The tundish hot water receiving portion 2 and the pouring portion 3 are partitioned by the weir 10.
In other words, the hot water receiving part 2 is partitioned and formed as a substantially trapezoidal region surrounded by the short side 6, the two oblique sides 7, 7 ′ and the weir 10, and the pouring part 3 has the long side 9 And is formed as a substantially rectangular region surrounded by the two sides 8 and 8 ′ and the weir 10.
The intersection of the hypotenuse 7 and the side 8 or the intersection of the hypotenuse 7 'and the side 8' does not have to be an exact intersection, and is near the intersection of the hypotenuse 7 and the side 8. Alternatively, it may be in the vicinity of the intersection of the hypotenuse 7 ′ and the side 8 ′.
In other words, in the tundish of the present invention formed as described above, the area of the hot water receiving part 2 is larger than the area of the hot water receiving part of the conventional T-type two-strand tundish. If the condition that the molten steel flow is not disturbed and does not adversely affect the floating separation effect of inclusions is satisfied, the tip of the weir 10 is near the intersection of the hypotenuse 7 and the side 8 or on the hypotenuse 7 'side. It may be in the vicinity of the intersection of the side 8 ′.
In the present invention, the hot water receiving portion 2 is partitioned and formed as a substantially trapezoidal region surrounded by the short side 6, the two oblique sides 7, 7 ′ and the weir 10, so that the conventional T-type two-strand tundish Compared to the hot water receiving section, the area is expanded, and as a result, the capacity of the tundish is increased.
本発明では、受湯部２と注湯部３とを区画形成する上記堰１０には、受湯部２と注湯部３を連通する連通孔１１を形成する。
取鍋からロングノズル４を介して受湯部２に受け入れられた溶鋼の一部は、受湯部２と注湯部３を連通する連通孔１１を通って、Ｆ１→Ｆ２→Ｆ３（Ｆ３’）のパスラインに沿って注湯部３へ流れるが、タンディッシュが大容量化されたことによって、溶鋼の残部は、Ｆ４（Ｆ４’）→Ｆ５（Ｆ５’）→Ｆ２→Ｆ３（Ｆ３’）というパスラインに沿った流れを生じ、連通孔１１を通って、注湯部３へ流入し、さらに、注湯部３に形成されたそれぞれの浸漬ノズル５（５’）を介して鋳型内へ注湯される。
そして、本発明では、堰１０と連通孔１１を設けたことによって、上記Ｆ４（Ｆ４’）で示す溶鋼流が直接浸漬ノズル５（５’）へ向かうことは阻止され、上記Ｆ４（Ｆ４’）→Ｆ５（Ｆ５’）→Ｆ２というパスラインに沿って連通孔１１を通して流れるから、Ｆ４（Ｆ４’）→Ｆ５（Ｆ５’）→Ｆ２→Ｆ３（Ｆ３’）というパスラインに沿って流れる溶鋼のパスラインが長くなり、また、溶鋼のタンディッシュ内滞留時間が長くなるため、介在物の浮上分離が効果的に行われる。その結果として、鋳片の清浄度が向上する。
なお、図２では、連通孔１１は、堰１０の長さ方向ほぼ中央部に設けているが、これは、Ｆ４→Ｆ５という溶鋼流と、Ｆ４’→Ｆ５’という溶鋼流のパスライン長さ、滞留時間を同じようにするためである。
したがって、Ｆ４→Ｆ５およびＦ４’→Ｆ５’という溶鋼流のパスライン長さ、滞留時間をほぼ同じにできるのであれば、連通孔１１を堰１０の長さ方向に複数個所設けることも勿論可能である。
また、連通孔の形状については、図２（ｂ）に示す長方形の孔形状ばかりでなく、正方形、円形等いかなる孔形状であっても構わない。
In the present invention, the weir 10 that partitions the hot water receiving portion 2 and the pouring portion 3 is formed with a communication hole 11 that communicates the hot water receiving portion 2 and the pouring portion 3.
A portion of the molten steel received from the ladle through the long nozzle 4 to the hot water receiving portion 2 passes through the communication hole 11 that connects the hot water receiving portion 2 and the pouring portion 3 to F1 → F2 → F3 (F3 ′ ) Flows to the pouring part 3 along the pass line, but due to the increased capacity of the tundish, the remainder of the molten steel is F4 (F4 ′) → F5 (F5 ′) → F2 → F3 (F3 ′) The flow along the path line is generated, flows into the pouring part 3 through the communication hole 11, and further into the mold through the respective immersion nozzles 5 (5 ') formed in the pouring part 3. It is poured.
And in this invention, by providing the weir 10 and the communicating hole 11, the molten steel flow shown by said F4 (F4 ') is prevented from heading directly to immersion nozzle 5 (5'), and said F4 (F4 ') → F5 (F5 ′) → F2 passes through the communication hole 11 along the path line F2, so the molten steel path flows along the path line F4 (F4 ′) → F5 (F5 ′) → F2 → F3 (F3 ′). Since the line becomes long and the residence time of the molten steel in the tundish becomes long, the floating separation of inclusions is effectively performed. As a result, the cleanness of the slab is improved.
In FIG. 2, the communication hole 11 is provided at a substantially central portion in the length direction of the weir 10, and this is the path line length of the molten steel flow F4 → F5 and the molten steel flow F4 ′ → F5 ′. This is to make the residence time the same.
Therefore, it is of course possible to provide a plurality of communication holes 11 in the length direction of the weir 10 so long as the pass line length and residence time of the molten steel flow F4 → F5 and F4 ′ → F5 ′ can be made substantially the same. is there.
Moreover, about the shape of a communicating hole, not only the rectangular hole shape shown in FIG.2 (b) but any hole shape, such as a square and a circle, may be sufficient.
本発明では、確実に、溶鋼のパスラインを長くし、また、溶鋼の滞留時間を長くするために、上記堰１０の断面積を、定常状態の溶鋼流路断面積以上と定める。
これは、受湯部２からの溶鋼流が堰１０の上部をあふれ出して注湯部３流れ出すような場合には、Ｆ４（Ｆ４’）→Ｆ５（Ｆ５’）→Ｆ２→Ｆ３（Ｆ３’）というパスラインに沿った溶鋼の流れを形成することができないばかりか、浮上分離された介在物が再度溶鋼流中に混入してしまい、清浄度の高い鋳片を製造することができなくなるからである。
In the present invention, the cross-sectional area of the weir 10 is determined to be equal to or larger than the cross-sectional area of the molten steel flow path in a steady state in order to reliably lengthen the molten steel pass line and lengthen the residence time of the molten steel.
This is because when the molten steel flow from the hot water receiving part 2 overflows the upper part of the weir 10 and flows out into the pouring part 3, F4 (F4 ′) → F5 (F5 ′) → F2 → F3 (F3 ′) This is because the flow of molten steel along the path line cannot be formed, and inclusions separated by levitation are mixed into the molten steel flow again, making it impossible to produce a highly clean slab. is there.
本発明では、堰１０に形成する連通孔１１の位置を、連通孔の最上端から定常状態の溶鋼表面までの距離が１００〜１５０ｍｍであるような位置と定める。
これは、連通孔の最上端から定常状態の溶鋼表面までの距離が１００〜１５０ｍｍより小さい場合には、受湯部２で浮上分離された介在物が連通孔を通過して注湯部３の溶鋼中に混入してしまい、鋳片内に介在物が残存し、清浄度を高められなくなるからであり、一方、連通孔の最上端から定常状態の溶鋼表面までの距離が１００〜１５０ｍｍより大きい場合には、連通孔を通過した後の溶鋼から溶鋼表面までの垂直距離が大きいため溶鋼中介在物が浮上するのに必要な距離が長くなり、清浄度を高めにくくなるからである。
以上のとおり、本発明の大容量かつ平面内郭形状が六角形の連続鋳造用２ストランドタンディッシュによれば、介在物の浮上分離効果を何ら阻害することなく、タンディシュの大容量化が図れることから、高温状態の溶鋼の熱を有効利用することができるとともに、タンディッシュ内溶鋼の温度管理、成分均質化、鋳型へ注湯する溶鋼温度の管理等を容易に行うことができ、さらに、製造される鋳片の清浄度の向上、材質の均質化を図ることができる。
In the present invention, the position of the communication hole 11 formed in the weir 10 is determined as a position where the distance from the uppermost end of the communication hole to the molten steel surface in a steady state is 100 to 150 mm.
This is because, when the distance from the uppermost end of the communication hole to the surface of the molten steel in a steady state is smaller than 100 to 150 mm, the inclusions floating and separated in the hot water receiving part 2 pass through the communication hole and This is because the inclusion in the molten steel remains in the slab and the cleanliness cannot be increased. On the other hand, the distance from the uppermost end of the communication hole to the surface of the molten steel in a steady state is larger than 100 to 150 mm. In this case, the vertical distance from the molten steel to the molten steel surface after passing through the communication hole is large, so that the distance necessary for the inclusions in the molten steel to float rises and it becomes difficult to increase the cleanliness.
As described above, according to the two-strand tundish for continuous casting having a large capacity and a planar inner shape of the present invention, the capacity of the tundish can be increased without impeding the floating separation effect of inclusions. In addition, it is possible to effectively use the heat of molten steel in a high temperature state, easily control the temperature of molten steel in the tundish, homogenize the components, manage the temperature of the molten steel poured into the mold, etc. It is possible to improve the cleanliness of the cast slab and to homogenize the material.
以下、本発明の実施例について説明する。
本発明の実施例として、図２（ａ）に示す平面内郭形状が六角形の２ストランドタンディッシュを用いて、表１に示す連続鋳造条件で表２に示す鋼種を鋳造し、本発明鋳片を製造した。
また、本発明による効果を明らかにするために、比較例として、図１に示すに示す平面内郭形状がＴ型の２ストランドタンディッシュを用いて、同じく表１に示す連続鋳造条件で表２に示す鋼種を鋳造し、比較例鋳片を製造した。
タンディッシュのサイズ・寸法は、図１、図２（ａ）の記号に則して言えば、次のとおりである。
短辺：（６）＝（２６）
長辺：（９）＝（２９）＝２．６×（６）＝２．６×（２６）
浸漬ノズル間距離：（（５）−（５’））＝（（２５）−（２５’））＝１．９×（６）
＝１．９×（２６）
容量：（本発明タンディッシュ）＝１．７×（比較例タンディッシュ）
連通孔：連通孔の上端部位置と、定常状態の溶鋼表面までの距離が１５０ｍｍとなる位置であって、堰（１０）の長さ方向の対称的な２箇所に、縦１００ｍｍ×横３５０ｍｍのサイズの長方形連通孔を形成
鼠孔：２箇所に設置した連通孔のそれぞれの下方のコーナー部あるいはコーナー近傍に、縦１００ｍｍ×横１２０ｍｍのサイズの長方形鼠孔を形成
Examples of the present invention will be described below.
As an example of the present invention, a steel type shown in Table 2 was cast under the continuous casting conditions shown in Table 1 using a two-strand tundish whose inner surface shape shown in FIG. Pieces were produced.
Further, in order to clarify the effect of the present invention, as a comparative example, a two-strand tundish having a planar inner shape shown in FIG. The steel types shown in Table 2 were cast to produce a comparative slab.
The size and dimensions of the tundish are as follows in accordance with the symbols in FIG. 1 and FIG.
Short side: (6) = (26)
Long side: (9) = (29) = 2.6 × (6) = 2.6 × (26)
Distance between immersion nozzles: ((5) − (5 ′)) = ((25) − (25 ′)) = 1.9 × (6)
= 1.9 × (26)
Capacity: (present invention tundish) = 1.7 × (comparative example tundish)
Communication hole: The position where the distance between the upper end position of the communication hole and the surface of the molten steel in a steady state is 150 mm, and two symmetrical positions in the length direction of the weir (10) are 100 mm in length and 350 mm in width. Forms rectangular communication holes of size Fistula: Forms rectangular fistulas with a size of 100 mm in length and 120 mm in width at the corners or near the corners of the communication holes installed at two locations.
まず、上記で本発明鋳片と比較例鋳片を製造した後、本発明タンディッシュと比較例タンディッシュそれぞれのロングノズル近傍の介在物の大きさとその個数を調査し、ロングノズルを介してタンディシュ受湯部に受け入れられた溶鋼中に含有されていた介在物（これを、初期介在物という）の大きさとその個数であるとして扱った。
ここで、ロングノズル近傍の介在物の大きさとその個数の調査手法は、以下のとおりである。
まず、１チャージの鋳造時間の半ば（鋳造開始から１時間後）時点で、タンディッシュ内のロングノズル近傍の溶鋼をサンプリングし、サンプリングした溶鋼を凝固させた。この凝固したサンプルから評価用試験片を採取した。
その後、評価用試験片の表面の酸化被膜や外来の狭雑物を除去したものを溶液（具体的にはヨウ素アルコール）で溶解し、３７μｍ以上の介在物を抽出した。あわせて、評価用試験片の溶解量を計量した。顕微鏡観察により、この抽出した介在物の大きさ区分別の個数をカウントし、溶解量と個数から大きさ区分別の単位質量当たりの個数を算出し、その大きさの初期介在物の個数とした。
First, after producing the slab of the present invention and the slab of the comparative example as described above, the size and the number of inclusions in the vicinity of the long nozzles of the tundish of the present invention and the comparative example tundish were investigated, and the tundish was passed through the long nozzle. It was treated as the size and the number of inclusions (this was called initial inclusions) contained in the molten steel received in the hot water receiving part.
Here, the investigation method of the size and the number of inclusions in the vicinity of the long nozzle is as follows.
First, at the middle of the casting time of one charge (1 hour after the start of casting), the molten steel near the long nozzle in the tundish was sampled, and the sampled molten steel was solidified. An evaluation specimen was collected from the solidified sample.
Thereafter, the oxide film on the surface of the test piece for evaluation and foreign impurities removed were dissolved with a solution (specifically iodine alcohol), and inclusions of 37 μm or more were extracted. In addition, the dissolution amount of the test specimen for evaluation was measured. By microscopic observation, the number of inclusions extracted by size category was counted, and the number per unit mass for each size category was calculated from the dissolved amount and the number, and the number of initial inclusions of that size was used. .
ついで、上記で製造した本発明鋳片と比較例鋳片のそれぞれについて、鋳片内に存在する介在物（これを、流出介在物という）の大きさとその個数を調査した。
ここで、流出介在物の大きさとその個数の調査は、鋳片の長さ方向に対して直交する鋳片断面の３方向について、それぞれ、鋳片の厚さ方向の４箇所の領域（表層から５ｍｍまで、５〜１０ｍｍまで、４０〜４５ｍｍまで、７５〜８０ｍｍまで）において合計１２点の評価用試験片を採取した。その後、前記と同一の方法で各評価用試験片における大きさ区分別の単位質量当たりの個数の１２点の平均値を算出し、その大きさの流出介在物の個数とした。
Next, the size and the number of inclusions (referred to as outflow inclusions) present in the slab were examined for each of the slab of the present invention and the comparative example slab produced as described above.
Here, the size and the number of outflow inclusions were examined in each of four regions (from the surface layer) in the thickness direction of the slab in each of the three directions of the slab cross section perpendicular to the length direction of the slab. A total of 12 test specimens were collected at 5 mm, 5-10 mm, 40-45 mm, and 75-80 mm. Thereafter, an average value of 12 points of the number per unit mass for each size category in each test specimen for evaluation was calculated by the same method as described above, and was used as the number of outflow inclusions of that size.
表３に、初期介在物の大きさとその個数、流出介在物の大きさとその個数についての測定結果を示す。
また、表３には、本発明タンディッシュと比較例タンディッシュによる介在物の浮上分離率（％）の値を求め、これを記入した。
ここで、介在物の浮上分離率（％）
＝（初期介在物個数−流出介在物個数）／初期介在物個数×１００
である。
Table 3 shows the measurement results of the size and number of initial inclusions and the size and number of outflow inclusions.
In Table 3, the value of the floating separation rate (%) of inclusions by the tundish of the present invention and the comparative example tundish was obtained and entered.
Here, the floating separation rate of inclusions (%)
= (Number of initial inclusions−number of outflow inclusions) / number of initial inclusions × 100
It is.
図３は、表３で求めた介在物の浮上分離率（％）と介在物粒子径（介在物の大きさ）との関係を示すグラフである。 FIG. 3 is a graph showing the relationship between the floating separation rate (%) of inclusions determined in Table 3 and the particle size of inclusions (inclusion size).
表３及び図３の結果によれば、本発明タンディッシュを用いた場合には、介在物の大きさに拘わらず、介在物の浮上分離率が極めて高いことが分かる。
したがって、溶鋼の連続鋳造に際し、本発明の大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュを用いて鋳片を製造した場合には、清浄度の極めて高い鋳片を製造し得ることが分かる。
しかも、本発明のタンディシュは大容量であることから、製造される鋳片の清浄度、鋳片の均質性を損なうことなく、高温状態の溶鋼の熱を有効利用することができるとともに、タンディッシュ内溶鋼の温度管理、成分均質化、鋳型へ注湯する溶鋼温度の管理等を容易に行うことができる。
According to the results in Table 3 and FIG. 3, it can be seen that when the tundish of the present invention is used, the floating separation rate of inclusions is extremely high regardless of the size of the inclusions.
Therefore, in the case of continuous casting of molten steel, when a slab is manufactured using the two-strand tundish for continuous casting of the present invention having a large capacity and a flat inner shape, the slab of extremely high cleanliness is used. It can be seen that it can be manufactured.
Moreover, since the tundish of the present invention has a large capacity, it is possible to effectively use the heat of molten steel in a high temperature state without impairing the cleanness of the slab to be produced and the homogeneity of the slab, and the tundish It is possible to easily manage the temperature of the inner molten steel, homogenize the components, manage the temperature of the molten steel poured into the mold, and the like.
（１）：本発明の大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュ
（２）：受湯部
（３）：注湯部
（４）：ロングノズル
（５），（５’）：浸漬ノズル
（６）：短辺
（７），（７’）：斜辺
（８），（８’）：側辺
（９）：長辺
（１０）：堰
（１１）：連通孔
（２１）：従来のＴ型２ストランドタンディッシュ
（２２）：受湯部
（２３）：注湯部
（２４）：ロングノズル
（２５），（２５’）：浸漬ノズル
（２６）：短辺
（２７），（２７’）：側辺
（２７ａ），（２７ａ’）：縦側辺
（２７ｂ），（２７ｂ’）：横側辺
（２８），（２８’）：側辺
（２９）：長辺
(1): Two-strand tundish for continuous casting having a large capacity and a flat inner shape of the present invention (2): Hot water receiving part (3): Pouring part (4): Long nozzle (5), (5 ′): immersion nozzle (6): short side (7), (7 ′): hypotenuse (8), (8 ′): side (9): long side (10): weir (11): communication Hole (21): Conventional T-shaped two-strand tundish (22): Hot water receiving part (23): Pouring part (24): Long nozzle (25), (25 '): Immersion nozzle (26): Short side (27), (27 ′): Side (27a), (27a ′): Vertical side (27b), (27b ′): Horizontal side (28), (28 ′): Side (29): The long side
Claims (4)
該タンディッシュの平面内郭形状はお結び型（三角形または三つの長辺を曲線あるいはそれぞれ複数の直線あるいはそれぞれ一つの直線で連結した形状）であり、上記受湯部と注湯部との間には堰が形成され、上記タンディッシュの内郭を構成する辺と上記堰によって平面形状がほぼ台形あるいは三角形の上記受湯部が構成され、また、上記タンディッシュの内郭を構成する残りの辺と上記堰によって平面形状がほぼ長方形の上記注湯部が構成され、上記堰には受湯部と注湯部を連通する連通孔が設けられ、上記連通孔と堰の合計断面積は定常状態の溶鋼流路断面積以上であることを特徴とする大容量かつ平面内郭形状がお結び型の連続鋳造用２ストランドタンディッシュ。 A hot water receiving part for receiving molten steel from a ladle through a long nozzle and a pouring part for pouring the molten steel into a mold through an immersion nozzle, and the center of the long nozzle and the center of the immersion nozzle are aligned. 2 strand tundish for continuous casting
The plane inner shape of the tundish is a knot type (a triangle or three long sides connected by a curved line, a plurality of straight lines, or a single straight line), between the hot water receiving part and the pouring part. The weir is formed, and the side of the tundish that forms the inner wall of the tundish and the weir constitutes the hot water receiving portion having a substantially trapezoidal or triangular shape, and the remaining side that forms the inner surface of the tundish The pouring part having a substantially rectangular planar shape is constituted by the weir, and the weir is provided with a communication hole for communicating the hot water receiving part and the pouring part. The total cross-sectional area of the communication hole and the weir is in a steady state. A two-strand tundish for continuous casting having a large capacity and a flat inner surface shape, characterized by having a cross-sectional area of the molten steel flow path or larger.
4. The large capacity and planar inner shape according to claim 1, wherein a distance from the uppermost end of the communication hole to the surface of the molten steel in a steady state is 100 to 150 mm. 2 strand tundish of mold.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6071461U (en) * | 1983-10-21 | 1985-05-20 | 新日本製鐵株式会社 | Tundish for multi-strip casting |
| JPH1071456A (en) * | 1996-08-28 | 1998-03-17 | Nippon Steel Corp | Tundish for removing slag in hot state and method therefor |
| JP2000334549A (en) * | 1999-05-28 | 2000-12-05 | Kawasaki Steel Corp | Production of high cleanliness steel |
| JP2007090424A (en) * | 2005-09-30 | 2007-04-12 | Nippon Steel Corp | Tundish for continuous casting |
-
2012
- 2012-03-22 JP JP2012065838A patent/JP5850776B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6071461U (en) * | 1983-10-21 | 1985-05-20 | 新日本製鐵株式会社 | Tundish for multi-strip casting |
| JPH1071456A (en) * | 1996-08-28 | 1998-03-17 | Nippon Steel Corp | Tundish for removing slag in hot state and method therefor |
| JP2000334549A (en) * | 1999-05-28 | 2000-12-05 | Kawasaki Steel Corp | Production of high cleanliness steel |
| JP2007090424A (en) * | 2005-09-30 | 2007-04-12 | Nippon Steel Corp | Tundish for continuous casting |
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