JPH03174958A - Submerged nozzle for continuous casting - Google Patents
Submerged nozzle for continuous castingInfo
- Publication number
- JPH03174958A JPH03174958A JP31495489A JP31495489A JPH03174958A JP H03174958 A JPH03174958 A JP H03174958A JP 31495489 A JP31495489 A JP 31495489A JP 31495489 A JP31495489 A JP 31495489A JP H03174958 A JPH03174958 A JP H03174958A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- mold
- slab
- molten metal
- inner hole
- 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
- 238000009749 continuous casting Methods 0.000 title claims description 15
- 239000002184 metal Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000007654 immersion Methods 0.000 claims description 15
- 230000004907 flux Effects 0.000 abstract description 16
- 239000000956 alloy Substances 0.000 abstract description 13
- 229910045601 alloy Inorganic materials 0.000 abstract description 13
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、銅基合金のスラブ鋳片を連続的に鋳造する際
に用いられる上端が開放型の鋳型に溶湯を供給する連続
鋳造用浸漬ノズルに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a continuous casting immersion method for supplying molten metal to a mold with an open top that is used when continuously casting slab slabs of copper-based alloys. Regarding nozzles.
連続鋳造方法は、タンデイツシュの溶湯、または溶解炉
から樋に出湯された溶湯を水冷銅鋳型内に供給し、鋳型
で溶湯を冷却して順次凝固させ、連続的に鋳型から鋳片
を引き抜く方法であり、鉄鋼及び非鉄金属の鋳造法とし
て広く用いられている。The continuous casting method is a method in which the molten metal from the tundish or the molten metal discharged from the melting furnace into the gutter is fed into a water-cooled copper mold, the molten metal is cooled in the mold and solidified one by one, and the slabs are continuously pulled out from the mold. It is widely used as a casting method for steel and non-ferrous metals.
一般に連続鋳造法により銅基合金のスラブ鋳片を鋳造す
る場合、鋳造用の鋳型には対向する一対の鋳型短片と同
じく一対の鋳型長片から構成された矩形の貫通鋳型が使
用され、タンデイツシュあるいは樋から鋳型内への溶湯
の供給には、鋳片の鋳肌や、特に鋳片内部に発生するピ
ンホールの発生状況から、鋳造方向に対して垂直に溶湯
が噴出する逆T字型のノズルが使用されている。Generally, when casting slab slabs of copper-based alloys by the continuous casting method, a rectangular through-hole mold is used, which consists of a pair of opposing short mold pieces and a pair of long mold pieces, and To supply the molten metal from the gutter into the mold, an inverted T-shaped nozzle is used that spouts the molten metal perpendicular to the casting direction, taking into consideration the surface of the slab and the occurrence of pinholes inside the slab. is used.
このノズルは、第1図に示すように、ノズル1の鋳造方
向垂直断面の中心線に沿って円筒型の噴出口2を有する
ものが一般的であり、ノズル1は、第2図に示すように
、溶湯が鋳型4の長片に平行に噴出するようにタンデイ
ツシュまたは樋に取り付けられている。As shown in FIG. 1, this nozzle generally has a cylindrical ejection port 2 along the center line of a cross section perpendicular to the casting direction of the nozzle 1. The mold 4 is attached to a tundish or trough so that the molten metal is ejected parallel to the long pieces of the mold 4.
連続鋳造法により鋳造欠陥の少ない鋳片を安定して鋳造
するためには、鋳型内で均一に抜熱を行なうこと、また
鋳型内の溶湯表面を被覆するモールドフラックスを十分
に供給し、鋳型と鋳片の潤滑性を保つこと、また、鋳片
内部へのモールドフラックスの巻き込みを防止すること
が重要である。In order to stably cast slabs with few casting defects using the continuous casting method, heat must be removed uniformly within the mold, and a sufficient amount of mold flux must be supplied to coat the surface of the molten metal within the mold. It is important to maintain the lubricity of the slab and to prevent mold flux from getting caught inside the slab.
しかしながら、上記の従来技術では、溶湯の鋳型内への
供給量によってはノズルからの溶湯の噴出流が溶湯表面
を被覆しているモールドフラックスを鋳型内に巻き込み
、その巻き込まれたモールドフラックスが凝固殻に捕捉
され、鋳片内部に残留するという問題がある。However, in the above conventional technology, depending on the amount of molten metal supplied into the mold, the jet flow of molten metal from the nozzle may engulf the mold flux covering the surface of the molten metal into the mold, and the engulfed mold flux may solidify into a shell. There is a problem that it is trapped inside the slab and remains inside the slab.
このように鋳片内部に残留したモールドフラックスは以
後の銅基合金条の製造工程で表面欠陥として現われ、表
面品質上大きな制約となっており、歩留低下の一因とな
っていた。The mold flux remaining inside the slab appears as a surface defect in the subsequent manufacturing process of the copper-based alloy strip, and is a major constraint on surface quality, contributing to a decrease in yield.
本発明は、上記事情に鑑みなされたものであって、銅基
合金の連続鋳造の際に鋳型内へモールドフラックスの巻
き込みを生じさせずに、健全な銅基合金のスラブ鋳片を
安定して供給するための銅基合金の連続鋳造方法を提供
することを目的とする。The present invention has been made in view of the above circumstances, and it is possible to stably produce a sound slab slab of a copper-based alloy without causing mold flux to be drawn into the mold during continuous casting of a copper-based alloy. The object of the present invention is to provide a continuous casting method for copper-based alloys.
上記目的を解決するため本発明者は、銅基合金のスラブ
鋳片を連続鋳造法により鋳造するにあたり、浸漬ノズル
の形状とモールドフラックスのスラブ鋳片内への巻き込
みに起因する表面欠陥の発生状況との関係について鋭意
研究を重ねた。In order to solve the above object, the present inventor has investigated the occurrence of surface defects due to the shape of the immersion nozzle and the entrainment of mold flux into the slab slab when casting slab slabs of copper-based alloy by continuous casting method. We have conducted extensive research into the relationship between
その結果、浸漬ノズルの二つの噴出孔断面積の和と内孔
断面積との比を選択することによって、その後の製造工
程で現われるモールドフラックスのスラブ鋳片内への巻
き込みに起因する表面欠陥が低減すること、すなわち、
スラブ鋳片内にモールドフラックスが巻き込まれるのを
抑制できることを知見した。As a result, by selecting the ratio between the sum of the cross-sectional areas of the two nozzle nozzles and the cross-sectional area of the inner hole, surface defects caused by the entrainment of mold flux into the slab slab that appears in the subsequent manufacturing process can be reduced. to reduce, i.e.
It was discovered that it is possible to suppress mold flux from getting caught up in the slab slab.
すなわち、本発明に係る連続鋳造用浸漬ノズルは、鋳造
方向に対して垂直に溶湯が噴出する連続鋳造用2孔浸漬
ノズルにおいて、浸漬ノズルの二つの噴出孔断面積の和
A、と浸漬ノズルの内孔断面積A2との比を
A1/A、≦1.1
の範囲とすることを特徴としたものである。That is, the immersion nozzle for continuous casting according to the present invention is a two-hole immersion nozzle for continuous casting in which molten metal is ejected perpendicularly to the casting direction. It is characterized in that the ratio to the internal hole cross-sectional area A2 is in the range of A1/A, ≦1.1.
本発明は、浸漬ノズルの二つの噴出孔断面積の和A工と
浸漬ノズルの内孔断面積A2との比を1.1以下とする
ことによって鋳型内へのモールドフラックスが巻き込ま
れるのを防止するものである。The present invention prevents mold flux from being drawn into the mold by setting the ratio of the cross-sectional area of the two ejection holes of the immersed nozzle to the cross-sectional area of the inner hole A2 of the immersed nozzle to 1.1 or less. It is something to do.
その理由は、上記断面積の比が、1.1より大きい2孔
浸漬ノズルを用いた上記連続鋳造では。The reason for this is that in the continuous casting using a two-hole immersion nozzle in which the ratio of the cross-sectional areas is greater than 1.1.
浸漬ノズルから噴出される溶湯の噴出流が偏流となり、
定常的に鋳型短片に対し垂直方向に噴出せず、モールド
フラックス被覆面直下で不規則な溶湯流動を生じ、その
際に、モールドフラックスがスラブ鋳片内に巻き込まれ
、前述したごとく、以後の製造工程で表面欠陥として現
われるためである。The jet flow of molten metal spouted from the immersion nozzle becomes a biased flow,
The molten metal does not constantly eject perpendicularly to the mold strip, but irregular flow occurs just below the mold flux coating surface, and at this time, the mold flux gets caught up in the slab slab, and as mentioned above, it interferes with subsequent production. This is because they appear as surface defects during the process.
なお、ここでいう浸漬ノズル噴出口断面積及び浸漬ノズ
ル内孔断面積は、第1図に示す浸漬ノズルの噴出口2、
内孔3の円形断面の面積である。Note that the submerged nozzle ejection port cross-sectional area and submerged nozzle inner hole cross-sectional area herein refer to the submerged nozzle ejection port 2 shown in FIG.
This is the area of the circular cross section of the inner hole 3.
以下に実験例により本発明及びその効果を具体的に説明
する。The present invention and its effects will be specifically explained below using experimental examples.
本実験は、連続鋳造法により第1表に示した浸漬ノズル
の二つの噴出孔断面積の和と浸漬ノズルの内孔断面積と
の比を変化させた2孔浸漬ノズルを用いて黄銅2種スラ
ブを鋳造し、その後、圧延加工によって製造した条の表
面に現われる表面欠陥の個数を計数して行なった。This experiment was conducted using two types of brass using a two-hole immersion nozzle in which the ratio of the sum of the cross-sectional areas of the two nozzle holes shown in Table 1 and the cross-sectional area of the inner hole of the immersion nozzle was changed using the continuous casting method. A slab was cast, and then the number of surface defects appearing on the surface of the strip manufactured by rolling was counted.
これらの結果を比較例とともに第1表に示した。These results are shown in Table 1 along with comparative examples.
第1表から判るようにノズル噴出孔の直径d工とノズル
内径の直径d2から計算した浸漬ノズルの二つの噴出孔
断面積の和と浸漬ノズルの内孔断面積との比が1.1以
下の本発明の実施例では、すべてその表面に欠陥が表わ
れなかった。As can be seen from Table 1, the ratio of the sum of the cross-sectional areas of the two nozzle orifices of the submerged nozzle calculated from the diameter d of the nozzle ejection port and the diameter d2 of the nozzle inner diameter to the cross-sectional area of the inner hole of the submerged nozzle is 1.1 or less. All of the examples of the present invention exhibited no defects on their surfaces.
また、上記浸漬ノズルの二つの噴出孔断面積の和と浸漬
ノズルの内孔断面積との断面積比が1.1以上の比較例
では条の表面に欠陥が発生した。Furthermore, in comparative examples where the cross-sectional area ratio between the sum of the cross-sectional areas of the two ejection holes of the immersed nozzle and the cross-sectional area of the inner hole of the immersed nozzle was 1.1 or more, defects occurred on the surface of the strip.
第
1
表
(注1)
(注2)
断面積比はノズル噴出孔直径d1及びノズル内孔直径d
2から各々計算される二つのノズル噴出孔断面積の和と
ノズル内孔断面積との比を表わす。Table 1 (Note 1) (Note 2) The cross-sectional area ratio is the nozzle jet hole diameter d1 and the nozzle inner hole diameter d.
2 represents the ratio of the sum of the cross-sectional areas of two nozzle ejection holes and the cross-sectional area of the nozzle inner hole, respectively calculated from 2.
表面欠陥数は条表面1平方メートルに存在する平均の表
面欠陥の個数を示す。The number of surface defects indicates the average number of surface defects present on 1 square meter of the strip surface.
したがって、本発明に係る連続鋳造用浸漬ノズルを用い
て銅基合金のスラブ鋳片を鋳造すると、モールドフラッ
クスの巻き込みによる鋳造欠陥を生じさせない健全な銅
基合金のスラブ鋳片を得ることができる。Therefore, when a slab slab of a copper-based alloy is cast using the immersion nozzle for continuous casting according to the present invention, a slab slab of a copper-based alloy that is sound and free from casting defects due to entrainment of mold flux can be obtained.
以上に述べた本発明によれば、モールドフラックスの巻
き込みによる鋳造欠陥のない健全な銅基合金のスラブ鋳
片を安定して鋳造することが可能である。According to the present invention described above, it is possible to stably cast a sound slab slab of a copper-based alloy free of casting defects due to entrainment of mold flux.
第1図は、本発明に係る実施例の2孔浸漬ノズルを示し
、(a)は縦断面図、(b)は側面図、(c)は横断面
図、第2図は、2孔浸漬ノズルの鋳型取り付は位置を示
す説明図であり、図中の矢印は溶湯のノズルからの噴出
流を示している。
工・・・ノズル、 2・・・ノズル噴出孔、3・
・・ノズル内孔、 4・・・鋳型。FIG. 1 shows a two-hole immersion nozzle according to an embodiment of the present invention, (a) is a longitudinal sectional view, (b) is a side view, (c) is a cross-sectional view, and FIG. 2 is a two-hole immersion nozzle. This is an explanatory diagram showing the position of the nozzle attached to the mold, and the arrows in the diagram indicate the flow of molten metal ejected from the nozzle. Engineering: Nozzle, 2: Nozzle outlet, 3:
... Nozzle inner hole, 4... Mold.
Claims (1)
用2孔浸漬ノズルにおいて、浸漬ノズルの二つの噴出孔
断面積の和A_1と浸漬ノズルの内孔断面積A_2との
比を A_1/A_2≦1.1 の範囲とすることを特徴とした連続鋳造用浸漬ノズル。(1) In a two-hole immersion nozzle for continuous casting in which molten metal is ejected perpendicularly to the casting direction, the ratio of the sum A_1 of the cross-sectional area of the two ejection holes of the immersion nozzle to the cross-sectional area A_2 of the inner hole of the immersion nozzle is A_1/ A immersion nozzle for continuous casting, characterized in that A_2≦1.1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31495489A JPH03174958A (en) | 1989-12-04 | 1989-12-04 | Submerged nozzle for continuous casting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31495489A JPH03174958A (en) | 1989-12-04 | 1989-12-04 | Submerged nozzle for continuous casting |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03174958A true JPH03174958A (en) | 1991-07-30 |
Family
ID=18059662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP31495489A Pending JPH03174958A (en) | 1989-12-04 | 1989-12-04 | Submerged nozzle for continuous casting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03174958A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002066729A (en) * | 2000-08-22 | 2002-03-05 | Kurosaki Harima Corp | Submerged nozzle |
-
1989
- 1989-12-04 JP JP31495489A patent/JPH03174958A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002066729A (en) * | 2000-08-22 | 2002-03-05 | Kurosaki Harima Corp | Submerged nozzle |
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