JPH04253563A - Separation of nonmetallic inclusion in molten metal and pouring nozzle - Google Patents
Separation of nonmetallic inclusion in molten metal and pouring nozzleInfo
- Publication number
- JPH04253563A JPH04253563A JP1178191A JP1178191A JPH04253563A JP H04253563 A JPH04253563 A JP H04253563A JP 1178191 A JP1178191 A JP 1178191A JP 1178191 A JP1178191 A JP 1178191A JP H04253563 A JPH04253563 A JP H04253563A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- molten metal
- tundish
- flow
- side wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052751 metal Inorganic materials 0.000 title claims description 28
- 239000002184 metal Substances 0.000 title claims description 28
- 238000000926 separation method Methods 0.000 title description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 abstract description 4
- 238000005188 flotation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
Landscapes
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、タンディッシュ内で溶
融金属中の非金属介在物を分離除去する方法及びそれに
用いる給湯ノズル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 separating and removing nonmetallic inclusions in molten metal in a tundish, and a hot water nozzle used therein.
【0002】0002
【従来の技術】溶融金属中の非金属介在物が、鋼板など
の製品欠陥を引き起こすことはよく知られている。連続
鋳造等のタンディッシュ内で非金属介在物の浮上分離を
促進させるためには、溶融金属の攪拌を行い、非金属介
在物間の合体による粗大化を促し、また非金属介在物の
浮上に対しては、タンディッシュ等の容器内の溶融金属
の流動を制御することが重要である。例えば特公昭58
−27020号公報にはタンディッシュ内に堰を設けて
人工的に溶融金属の流動を制御し、流入口から流出口に
至る短く速い流れ(ショートサーキット)を防止し、非
金属介在物の分離を促進する方法が開示されている。2. Description of the Related Art It is well known that nonmetallic inclusions in molten metal cause defects in products such as steel sheets. In order to promote the flotation and separation of nonmetallic inclusions in a tundish during continuous casting, etc., the molten metal is stirred to promote coalescence and coarsening of the nonmetallic inclusions, and also to promote the flotation of nonmetallic inclusions. For this reason, it is important to control the flow of molten metal in a container such as a tundish. For example, special public service in 1983
Publication No. 27020 discloses that a weir is installed in the tundish to artificially control the flow of molten metal, prevent a short and fast flow from the inlet to the outlet (short circuit), and prevent the separation of non-metallic inclusions. A method of promoting is disclosed.
【0003】しかしながら、近年、鋼の連続鋳造用のタ
ンディッシュなどでコスト低減のために熱間でタンディ
ッシュを再利用するニーズが高まり、このためにタンデ
ィッシュを傾けることにより、残った溶融金属及びスラ
グを排出する必要が生じてきた。この際に容器内に堰が
あると、残った溶融金属、スラグを排出する際に、堰部
の耐火物が落ちたり、残った溶融金属やスラグが容易に
排出されないという問題が生じてきた。また、容器耐火
物コストに占める堰部分の比率が高く、堰の設置は耐火
物コストアップの原因となっていた。However, in recent years, there has been an increasing need to reuse hot tundishes for continuous casting of steel to reduce costs, and for this purpose, by tilting the tundish, remaining molten metal and It became necessary to discharge the slag. At this time, if there is a weir inside the container, problems have arisen in that when the remaining molten metal and slag are being discharged, the refractories in the weir may fall, and the remaining molten metal and slag cannot be easily discharged. In addition, the weir portion accounts for a high proportion of the cost of container refractories, and the installation of weirs has been a cause of increased refractory costs.
【0004】0004
【発明が解決しようとする課題】本発明では、従来の、
(1)鋳造終了時に残ったスラグ、溶融金属の排出が困
難、(2)堰設置による耐火物のコストアップ、等の問
題を解決し、タンディッシュ等の容器内で溶融金属中の
非金属介在物の分離を堰設置時以上に促進する方法及び
それに用いる給湯ノズルを提供することを目的とするも
のである。[Problem to be solved by the invention] In the present invention, the conventional
(1) Difficulty in discharging slag and molten metal remaining at the end of casting, (2) Increased cost of refractories due to the installation of weirs, etc. are solved, and non-metallic inclusions in molten metal in containers such as tundishes are solved. The object of the present invention is to provide a method for promoting the separation of objects more than when installing a weir, and a hot water nozzle for use in the method.
【0005】[0005]
【課題を解決するための手段】本発明者らは、非金属介
在物の浮上分離を促進するには、給湯ノズルより溶融金
属が吐出される際の流速を減衰させ、容器底部を高速で
流れる底流れなどのショートサーキットを防止すること
が重要と考えた。従来の方法では、ノズル吐出口から容
器底面までの距離が小さく、底面での反転流速も大きい
。そこで本発明者らは吐出流を容器側壁面に当てるため
、ノズル吐出角度及び吐出口から側壁面までの距離を調
整することにより、反転流による底流れを防止できるこ
とを発見し、本発明を構成するに至った。[Means for Solving the Problems] The present inventors have proposed that in order to promote floating separation of non-metallic inclusions, the flow velocity when the molten metal is discharged from the hot water supply nozzle is attenuated so that the molten metal flows at high speed at the bottom of the container. We considered it important to prevent short circuits such as underflow. In the conventional method, the distance from the nozzle outlet to the bottom of the container is small, and the reverse flow velocity at the bottom is also large. Therefore, the present inventors discovered that by adjusting the nozzle discharge angle and the distance from the discharge port to the side wall surface in order to apply the discharge flow to the side wall surface of the container, bottom flow due to reverse flow can be prevented, and the present invention has been constructed. I ended up doing it.
【0006】すなわち、本発明は、溶融金属を給湯ノズ
ルより一時的に受湯し流出口から排出するタンディッシ
ュにおいて、該給湯ノズルよりの吐出流を該流出口から
最も離れた該タンディッシュ側壁面に所定の距離を保ち
、ほぼ垂直に当てるように注湯することを特徴とする溶
融金属中の非金属介在物の分離方法であり、また、タン
ディッシュへの給湯ノズルにおいて、該ノズルの底部は
有底とし、吐出口は該ノズル底部側壁に開口したことを
特徴とするタンディッシュへの給湯ノズルである。That is, the present invention provides a tundish that temporarily receives molten metal from a hot water supply nozzle and discharges it from an outlet, and directs the discharge flow from the hot water supply nozzle to the side wall surface of the tundish that is farthest from the outlet. This is a method for separating non-metallic inclusions in molten metal, which is characterized by pouring the metal at a predetermined distance and hitting it almost perpendicularly to the tundish. This is a nozzle for supplying hot water to a tundish, characterized in that it has a bottom and a discharge port is opened in the side wall of the bottom portion of the nozzle.
【0007】[0007]
【作 用】本発明では、タンディッシュに注湯する際
に、大きなエネルギーをもつ吐出流を流出口から離れた
反対側の壁面にぶつけることにより、壁面周辺に大きな
乱流場を形成し、攪拌領域を形成している。そしてこの
攪拌領域において、介在物間の合体による粗大化が促進
される。[Function] When pouring into the tundish, the present invention creates a large turbulent flow field around the wall by hitting the discharge flow with high energy against the wall on the opposite side away from the outlet, creating agitation. forming an area. In this stirring region, coarsening due to coalescence between inclusions is promoted.
【0008】壁面に当たった流れは広い範囲で反転流を
形成し、この反転流は広い範囲で拡がり、ピストンフロ
ーに近づいた流れとなる。このために、大型の非金属介
在物の流出の起因とされているショートサーキット(流
入口より流出口に至る短絡流)が防止され、非金属介在
物の浮上分離が促進される。図1は本発明の実施状況を
示す全体図である。また図2は従来の実施状況を説明す
る断面図、図3は本発明の実施状況を説明する断面図で
ある。[0008] The flow that hits the wall surface forms a reversed flow over a wide range, and this reversed flow spreads over a wide range and becomes a flow approaching a piston flow. Therefore, a short circuit (a short-circuit flow from an inlet to an outlet) which is considered to be the cause of the outflow of large nonmetallic inclusions is prevented, and floating separation of the nonmetallic inclusions is promoted. FIG. 1 is an overall diagram showing the implementation status of the present invention. Further, FIG. 2 is a sectional view illustrating a conventional implementation situation, and FIG. 3 is a sectional view illustrating an implementation situation of the present invention.
【0009】図2に示したように、従来のストレートノ
ズルの場合溶融金属はv0 の吐出流となる。一方本発
明の方法では図3に示したように、ノズルの吐出部分で
As shown in FIG. 2, in the case of a conventional straight nozzle, the molten metal has a discharge flow of v0. On the other hand, in the method of the present invention, as shown in Fig. 3, the discharge part of the nozzle
【0010】0010
【数1】[Math 1]
【0011】まで吐出流速が下がり、更に側壁面に当た
るまでにv2 =v1 (b・d/x)(但し、xはノ
ズル〜壁面までの距離、bはポテンシャルコア長≒2、
dは吐出孔直径)まで減衰する。すなわち本発明の方法
では、ノズル〜壁面までの距離x及び分岐損出係数ξを
変化させるノズル吐出角度などを変えることにより、壁
面にあたる際の溶融金属の流速を調整することができ、
介在物浮上に必要な壁面近傍での溶融金属の攪拌及び反
転流の抑制が可能となる。The discharge flow velocity decreases to [0011], and by the time it hits the side wall, v2 = v1 (b・d/x) (where x is the distance from the nozzle to the wall, b is the potential core length≒2,
d is the discharge hole diameter). That is, in the method of the present invention, by changing the distance x from the nozzle to the wall surface and the nozzle discharge angle that changes the branching loss coefficient ξ, the flow velocity of the molten metal when it hits the wall surface can be adjusted.
It is possible to stir the molten metal near the wall surface and suppress the reverse flow necessary for floating inclusions.
【0012】なお、図5(a)は本発明の給湯ノズルの
、(b)は従来の給湯ノズルの夫々底部近傍の断面図で
ある。Note that FIG. 5(a) is a sectional view of the hot water supply nozzle of the present invention, and FIG. 5(b) is a sectional view of the vicinity of the bottom of a conventional hot water supply nozzle.
【0013】[0013]
【実施例】溶鋼鍋より100tonの低炭アルミキルド
鋼を図4に示すタンディッシュを経て連鋳モールドへ注
いだ。
注湯ノズルは図5(b)に示すような従来型のストレー
トタイプ(内径60mm)のものと、(a)に示す本発
明の底部が有底で吐出口が底部側壁で横に開口している
もの(内径60mm)2種類を用いて比較した。EXAMPLE 100 tons of low carbon aluminum killed steel was poured from a molten steel ladle into a continuous casting mold through a tundish shown in FIG. The pouring nozzle is a conventional straight type (inner diameter 60 mm) as shown in FIG. 5(b), and the present invention shown in FIG. 5(a) has a bottom with a bottom and a discharge port opens laterally on the side wall of the bottom. Comparison was made using two types (inner diameter 60 mm).
【0014】本発明の実施例として、流入ノズル〜流出
ノズル間の水平距離Lを1800mmと1200mmの
2つの場合について行った。ノズルの角度αはともに下
向きの5°である。また、従来型のストレートタイプの
ノズルは図4の8で示す位置で用い、堰を設備した場合
についても実験を行った。溶鋼通過量は1.1ton/
min で、各実験とも一定である。非金属介在物量は
、非金属介在物の集積し易い鋳片の1/4厚みの位置を
切り出し、スライム抽出法によって評価した。As an example of the present invention, two cases were conducted in which the horizontal distance L between the inlet nozzle and the outlet nozzle was 1800 mm and 1200 mm. The angle α of both nozzles is 5° downward. Further, a conventional straight type nozzle was used at the position shown by 8 in FIG. 4, and experiments were also conducted with a weir installed. The amount of molten steel passing through is 1.1 tons/
min, which is constant for each experiment. The amount of nonmetallic inclusions was evaluated by cutting out a 1/4 thickness position of the slab where nonmetallic inclusions tend to accumulate, and using a slime extraction method.
【0015】表1に各条件での鋳片より抽出される非金
属介在物量をまとめた。これより、Lが1200mmで
も1800mmでも、従来型の堰設置時よりも鋳片中の
非金属介在物量が少ないことがわかる。Table 1 summarizes the amount of nonmetallic inclusions extracted from the slab under each condition. From this, it can be seen that whether L is 1200 mm or 1800 mm, the amount of nonmetallic inclusions in the slab is smaller than when installing a conventional weir.
【0016】[0016]
【表1】[Table 1]
【0017】[0017]
【発明の効果】本発明により、タンディッシュ内での溶
融金属の流動を制御し、非金属介在物の浮上分離を促進
できた。この効果により、製品中の非金属介在物起因の
欠陥を減少させ、製品品質の向上ができるようになった
。また、堰を用いないことにより、鋳造終了時に容器中
に残った溶融金属、スラグの除去が容易となり、容器の
熱間再利用が可能となった。また、堰を用いないことに
より、堰設置に伴う耐火物コストの削減も可能となった
。Effects of the Invention According to the present invention, the flow of molten metal within the tundish can be controlled and the floating separation of non-metallic inclusions can be promoted. This effect reduces defects caused by nonmetallic inclusions in products and improves product quality. In addition, by not using a weir, it is easier to remove the molten metal and slag that remain in the container at the end of casting, allowing hot reuse of the container. Additionally, by not using a weir, it has become possible to reduce the cost of refractories associated with weir installation.
【図1】本発明の実施状況を示す全体図である。FIG. 1 is an overall diagram showing the implementation status of the present invention.
【図2】従来法の溶融金属の流れを模式的に示した概念
図である。FIG. 2 is a conceptual diagram schematically showing the flow of molten metal in a conventional method.
【図3】本発明法の溶融金属の流れを模式的に示した概
念図である。FIG. 3 is a conceptual diagram schematically showing the flow of molten metal in the method of the present invention.
【図4】実施例の説明補助図である。FIG. 4 is an auxiliary diagram for explaining the embodiment.
【図5】(a)は本発明の、(b)は従来の夫々ノズル
の縦断面図である。FIG. 5(a) is a vertical cross-sectional view of a nozzle of the present invention and FIG. 5(b) is a conventional nozzle.
1 取鍋 2 タンディッシュ 3 給湯ノズル 4 流出ノズル 5 溶融金属 6 底流れ(ショートサーキット) 7 ノズル(実施例実験時) 8 ノズル(比較例実験時) 9 堰(比較例実験時) 1 Ladle 2 Tundish 3 Hot water nozzle 4 Outflow nozzle 5 Molten metal 6 Undercurrent (short circuit) 7 Nozzle (at the time of example experiment) 8 Nozzle (during comparative example experiment) 9 Weir (during comparative example experiment)
Claims (2)
湯し流出口から排出するタンディッシュにおいて、該給
湯ノズルよりの吐出流を該流出口から最も離れた該タン
ディッシュ側壁面に所定の距離を保ち、ほぼ垂直に当て
るように注湯することを特徴とする溶融金属中の非金属
介在物の分離方法。Claim 1: In a tundish that temporarily receives molten metal from a hot water supply nozzle and discharges it from an outlet, the flow discharged from the hot water supply nozzle is directed to the side wall surface of the tundish furthest from the outlet at a predetermined distance. A method for separating non-metallic inclusions in molten metal, which is characterized by pouring the metal so that it hits the metal almost vertically.
て、該ノズルの底部は有底とし、吐出口は該ノズル底部
側壁に開口したことを特徴とするタンディッシュへの給
湯ノズル。2. A nozzle for supplying hot water to a tundish, characterized in that the bottom of the nozzle is closed, and the discharge port is opened in a side wall of the bottom of the nozzle.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1178191A JPH04253563A (en) | 1991-02-01 | 1991-02-01 | Separation of nonmetallic inclusion in molten metal and pouring nozzle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1178191A JPH04253563A (en) | 1991-02-01 | 1991-02-01 | Separation of nonmetallic inclusion in molten metal and pouring nozzle |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04253563A true JPH04253563A (en) | 1992-09-09 |
Family
ID=11787493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1178191A Pending JPH04253563A (en) | 1991-02-01 | 1991-02-01 | Separation of nonmetallic inclusion in molten metal and pouring nozzle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04253563A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002239691A (en) * | 2001-02-20 | 2002-08-27 | Kawasaki Steel Corp | Method for continuously casting molten metal |
-
1991
- 1991-02-01 JP JP1178191A patent/JPH04253563A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002239691A (en) * | 2001-02-20 | 2002-08-27 | Kawasaki Steel Corp | Method for continuously casting molten metal |
JP4543562B2 (en) * | 2001-02-20 | 2010-09-15 | Jfeスチール株式会社 | Continuous casting method for molten steel |
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