JPS6149758A - Molten steel sealing method in tandish - Google Patents
Molten steel sealing method in tandishInfo
- Publication number
- JPS6149758A JPS6149758A JP17306684A JP17306684A JPS6149758A JP S6149758 A JPS6149758 A JP S6149758A JP 17306684 A JP17306684 A JP 17306684A JP 17306684 A JP17306684 A JP 17306684A JP S6149758 A JPS6149758 A JP S6149758A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- gas
- tundish
- tandish
- pouring
- 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
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
- B22D11/106—Shielding the molten jet
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、連続鋳造におけるタンディツシュ内の溶鋼
シール方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for sealing molten steel in a tundish in continuous casting.
〈従来技術とその問題点〉
最近、低窒素鋼のニーズが高くなり、特開昭５４−６６
５２９号（不活性ガスシール方法）ζこ示されるように
、タンディツシュ内溶湯の酸化、吸Ｎ２を防止するため
（Ｑ、Ａｒガスによりシールすることは良く知られてお
り、実施されている。<Prior art and its problems> Recently, the need for low nitrogen steel has increased, and
No. 529 (Inert Gas Sealing Method) ζ As shown, sealing with Ar gas is well known and practiced in order to prevent oxidation and N2 absorption of the molten metal in the tundish (Q).
さらに、特開昭５９−２７７６０号（タンディ゛ンシュ
内シールガス制御方法）のように必要Ａｒガス量を最少
限となるよ゛うにしても、シール空間が大きく、洩Ａｒ
ガスが多（、Ａｒ原単位（製造鋳鋼量に対する使用Ａｒ
量）が高かった。特（こ、Ａｒガスは製造コストが高＜
、Ｎ２ガスの約１０倍以上の価格である。Furthermore, even if the required amount of Ar gas is minimized as in JP-A No. 59-27760 (method for controlling sealing gas in tundish), the sealing space is large and Ar leakage occurs.
There is a lot of gas (Ar consumption rate (Ar consumption per production amount
quantity) was high. Especially, Ar gas has a high production cost.
, is about 10 times more expensive than N2 gas.
一方、タンディツシュ内溶湯の動きを制限し、溶湯内の
介在物を浮上させるべく、タンディツシュ内に堰を設け
ることが行なわれており、特にタンディツシュ内受湯部
を仕切る方法として、特開昭５３−４６４３５号（連続
鋳造における清浄鋼の製造方法）および特開昭５４−３
１０１３号（連続鋳造用タンディツシュ内溶鋼中に金属
カルシウムあるいはカルシウム合金を添加する方法）な
どがある。On the other hand, in order to restrict the movement of the molten metal in the tundish and to float inclusions in the molten metal, weirs have been installed in the tundish. No. 46435 (method for producing clean steel in continuous casting) and JP-A-54-3
No. 1013 (method of adding metallic calcium or calcium alloy to molten steel in a tundish for continuous casting).
これらの方法も、仕切った受湯部はＡｒガスシールがな
されており、タンディツシュ内溶湯が安定している期間
、つまり受湯量と注湯量がバランスしており湯面レベル
がほぼ一定の間は良いが、取鍋交換、鋳込速度変更等の
製造条件変更時には、仕切堰下部が、湯面より外に出る
などシール条件も変わり、例えば酸化物系介在物の増加
など種々の不具合が発生することにより、タンディツシ
ュ内は仕切りの外の部分（注湯部）もＡｒガスによりシ
ールを行なっていた。These methods are also suitable as long as the partitioned receiving area is sealed with Ar gas and the molten metal in the tundish is stable, that is, the amount of received and poured molten metal is balanced and the level of the molten metal is approximately constant. However, when manufacturing conditions change, such as replacing the ladle or changing the pouring speed, the sealing conditions change, such as the lower part of the partition weir coming out from the surface of the molten metal, which can lead to various problems such as an increase in oxide inclusions. Therefore, the part of the tundish outside the partition (the pouring part) was also sealed with Ar gas.
以上のように、従来のガスシールに要するＡｒガスは膨
大であり、製鉄所内製造Ａｒガスの約３０〜５０％以上
をこの部位で消費している。As described above, a huge amount of Ar gas is required for the conventional gas seal, and approximately 30 to 50% or more of the Ar gas produced in the steelworks is consumed in this part.
ここで、従来窒素ガスによるシールが行なえない理由は
、溶鋼中に窒素ガスが吸収されるためであり、窒素は鋼
の青熱もろさや低温もろさを助長したり時効硬化を生じ
させることより危険視されていた。Here, the reason why conventional sealing with nitrogen gas cannot be performed is because nitrogen gas is absorbed into molten steel, and nitrogen is considered dangerous because it promotes the blue-hot brittleness and low-temperature brittleness of steel and causes age hardening. It had been.
しかし、吸窒素現象を詳細に検討、実験したところタン
ディツシュ内の静置溶湯表面よりの吸窒素は全く起こら
ないことが判明できた。このことより従来言われていた
吸窒素は全て受湯部の湯面変動部分で起っていることを
つきとめた。However, after a detailed study and experiment of the nitrogen absorption phenomenon, it was found that nitrogen absorption from the surface of the molten metal in the tundish did not occur at all. From this, it was determined that all of the nitrogen absorption that had previously been said occurs in the area where the hot water level fluctuates in the hot water receiving section.
この発明は、以上のような知見に基づいて提案されたも
ので、その目的は吸窒素を防止しつつ高価な不活性ガス
（Ａｒ、Ｈｅ等溶鋼に対して不活性なガスの使用量を大
幅に削減し得るタンディツシュ内の溶鋼シール方法を提
供することことある。This invention was proposed based on the above knowledge, and its purpose is to significantly reduce the amount of expensive inert gases (such as Ar and He) used for molten steel while preventing nitrogen absorption. An object of the present invention is to provide a method for sealing molten steel in a tundish, which can reduce the amount of molten steel in a tundish.
〈問題点を解決するための手段・作用〉この発明に係る
溶鋼シール方法は、タンディツシュ上部から垂下する堰
板によりタンディツシュ内を、湯面の変動部分である受
湯部と、静態部分である注湯部とに仕切り、これにより
受湯部の波動を制限して静態部分を拡大し、さらに、タ
ンディツシュ内溶湯安定期には、受湯部を不活性ガス、
注湯部を窒素ガスでガスシールし、タンディツシュ内溶
湯不安定期には、受湯部、注湯部ともに不活性ガスによ
りガスシールすることにより吸窒素を防止しつつ高価な
不活性ガスの使用量を大幅に削減するようにしたもので
ある。<Means/effects for solving the problem> The molten steel sealing method according to the present invention uses a weir plate hanging from the upper part of the tundish to divide the inside of the tundish into a molten metal receiving part where the molten metal level fluctuates and a static part. The molten metal is separated from the molten metal part, thereby limiting the wave motion in the molten metal receiving part and expanding the static part.Furthermore, when the molten metal in the tundish is stable, the molten metal receiving part is heated with inert gas,
The pouring section is sealed with nitrogen gas, and when the molten metal in the tundish is unstable, both the receiving section and the pouring section are sealed with inert gas to prevent nitrogen absorption while reducing the amount of expensive inert gas used. It was designed to significantly reduce the
〈実施例〉
以下、この発明を図示する一実施例に基づいて説明する
。<Example> The present invention will be described below based on an illustrative example.
第１図に示すように、タンディツシュ１上部から垂下す
る堰板２により、タンディツシュ１内が、取鍋６、取鍋
ノズル４かちの溶鋼５を受ける受湯部Ａ（変動部分）と
、それ以外の注湯部Ｂ（静態部分）の、２つの部分に分
割されている。As shown in Fig. 1, a weir plate 2 hanging from the top of the tundish 1 divides the inside of the tundish 1 into a ladle 6, a receiving part A (fluctuating part) that receives molten steel 5 from four ladle nozzles, and the rest. The pouring section B (static section) is divided into two parts.
吸窒素防止の研究より注湯部Ｂでは吸窒素は全く生じず
、気液混合域の受湯部へで吸窒素が生じることが明らか
である。Research on the prevention of nitrogen absorption has revealed that no nitrogen absorption occurs in the pouring section B, but that nitrogen absorption occurs in the receiving section in the gas-liquid mixing area.
そのため、タンディツシュ内溶湯安定期には、受湯部Ａ
をＡｒガスで、注湯部Ｂを窒素ガスでガスシールし、タ
ンディツシュ内溶湯不安定期には、受湯部Ａ、注湯部Ｂ
ともにＡｒガスによ□リガスシールし、注湯部Ｂを大部
分の時間にわたって窒素ガスによりガスシールすること
により高価なＡｒガスの使用量を５０％程度減少させて
いる。Therefore, during the stable period of molten metal in the tundish, the receiving part A
The molten metal in the tundish is sealed with Ar gas and the molten metal pouring part B with nitrogen gas.
Both are regas-sealed with Ar gas, and the pouring section B is gas-sealed with nitrogen gas for most of the time, reducing the amount of expensive Ar gas used by about 50%.
次に、第２図に示すグラフは、受湯部ＡへのＡｒガス供
給量を１０００（−ｇ／ｍｉｎ〕、注湯部Ｂへの窒素ガ
ス供給量を１ｏ ｏ ｏ （−６／ｍ１ｎ）とし、さら
に、Ｄ／ｄ （Ｄ ：受湯部Ａの代表長さ、ｄ：取鍋ノ
ズル４の内径）をパラメータとして、取鍋内からモール
ド内への鋼の吸窒素を測定したものであり、このような
グラフから
−Ｄ／ｄ≧５
であれば、吸窒素がほとんどなくなることが見い出され
た。Next, in the graph shown in Figure 2, the amount of Ar gas supplied to the receiving part A is 1000 (-g/min), and the amount of nitrogen gas supplied to the pouring part B is 1o o o (-6/m1n). Furthermore, the nitrogen absorption of the steel from the ladle to the mold was measured using D/d (D: representative length of the receiving part A, d: inner diameter of the ladle nozzle 4) as a parameter. From such a graph, it was found that if -D/d≧5, nitrogen absorption almost disappears.
これは、Ｄが小さい（狭い）とタンディツシュ内１嚇鋼
中の上下方向流れが大きくなり、堰外 Ｊ、域（注
湯部Ｂ）にも溶鋼表面の波立ちが起こり、雰囲気ガス（
窒素）の巻き込みによる吸窒素が起こるものと思われる
。This is because when D is small (narrow), the vertical flow in the first inlet steel in the tundish becomes large, ripples occur on the surface of the molten steel in the area J (pouring part B) outside the weir, and the atmospheric gas (
Nitrogen absorption is thought to occur due to entrainment of nitrogen (nitrogen).
〈発明の効果〉
前述のとおりこの発明によればタンディツシュ内を堰板
により受湯部と注湯部に分割し、受湯部に不活性ガスを
、安定した注湯部に対して窒素ガスを供給するようにし
たため、吸窒素を防止しつつ高価な不活性ガスを大幅に
削減でき、低窒素鋼を安価に製造し得る。<Effects of the Invention> As described above, according to this invention, the inside of the tundish is divided into a receiving part and a pouring part by a weir plate, and inert gas is supplied to the receiving part and nitrogen gas is supplied to the stable pouring part. Since nitrogen is supplied, the amount of expensive inert gas can be significantly reduced while preventing nitrogen absorption, and low-nitrogen steel can be manufactured at low cost.
第１図はこの発明に係る溶鋼シール方法を実施するため
のタンディツシュを示す縦断面図、第２図はＤ／ａをパ
ラメータとして吸窒素量を表わしたグラフである。
１ ・・タンディツシュ、２・・堰板、３・・取鍋、４
・・取鍋ノズル、５・・溶鋼、Ａ・・受湯部、Ｂ・・注
湯部。
第 １ 図
１ タンデイノンユ
２ ｗｉ板
３ 取鍋
Δ 受湯部
８ 注湯部FIG. 1 is a longitudinal cross-sectional view showing a tundish for implementing the molten steel sealing method according to the present invention, and FIG. 2 is a graph showing the amount of absorbed nitrogen using D/a as a parameter. 1. Tanditshu, 2. Weir board, 3. Ladle, 4
...Ladle nozzle, 5.. Molten steel, A.. Receiving section, B.. Pouring section. 1 Fig. 1 Tandei nonyu 2 Wi plate 3 Ladle Δ Receiving section 8 Pouring section
Claims (2)
デイッシュ内を、取鍋からの溶鋼を受ける受湯部と、そ
れ以外の注湯部とに分割し、タンデイッシュ内溶湯安定
期には、受湯部を不活性ガス、注湯部を窒素ガスでガス
シールし、タンデイッシュ内溶湯不安定期には、受湯部
、注湯部ともに不活性ガスによりガスシールすることを
特徴とするタンデイッシュ内の溶鋼シール方法。(1) A weir plate hanging from the top of the tundish divides the inside of the tundish into a receiving section that receives molten steel from the ladle and a pouring section for the rest of the molten metal. The inside of the tundish is characterized by gas-sealing the molten metal part with inert gas and the molten metal pouring part with nitrogen gas, and gas-sealing both the molten metal receiving part and the molten metal pouring part with inert gas when the molten metal in the tundish becomes unstable. Molten steel sealing method.
以上であることを特徴とする特許請求求の範囲第１項記
載のタンデイッシュ内の溶鋼シール方法。(2) The method for sealing molten steel in a tundish according to claim 1, wherein the equivalent diameter of the weir plate is five times or more the inner diameter of the pouring nozzle of the ladle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17306684A JPS6149758A (en) | 1984-08-20 | 1984-08-20 | Molten steel sealing method in tandish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17306684A JPS6149758A (en) | 1984-08-20 | 1984-08-20 | Molten steel sealing method in tandish |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6149758A true JPS6149758A (en) | 1986-03-11 |
| JPH0457426B2 JPH0457426B2 (en) | 1992-09-11 |
Family
ID=15953574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17306684A Granted JPS6149758A (en) | 1984-08-20 | 1984-08-20 | Molten steel sealing method in tandish |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6149758A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012061516A (en) * | 2010-09-17 | 2012-03-29 | Sumitomo Metal Ind Ltd | Consecutive continuous casting method |
| JP2013512782A (en) * | 2009-12-08 | 2013-04-18 | スウェレア・メフオス・アクチエボラーグ | Arrangement to control the flow from the tundish |
| KR20160067842A (en) * | 2013-08-26 | 2016-06-14 | 닛신 세이코 가부시키가이샤 | Continuous casting method |
-
1984
- 1984-08-20 JP JP17306684A patent/JPS6149758A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013512782A (en) * | 2009-12-08 | 2013-04-18 | スウェレア・メフオス・アクチエボラーグ | Arrangement to control the flow from the tundish |
| JP2012061516A (en) * | 2010-09-17 | 2012-03-29 | Sumitomo Metal Ind Ltd | Consecutive continuous casting method |
| KR20160067842A (en) * | 2013-08-26 | 2016-06-14 | 닛신 세이코 가부시키가이샤 | Continuous casting method |
| EP3040137A4 (en) * | 2013-08-26 | 2017-04-12 | Nisshin Steel Co., Ltd. | Continuous casting method |
| US9643241B2 (en) | 2013-08-26 | 2017-05-09 | Nisshin Steel Co., Ltd. | Continuous casting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0457426B2 (en) | 1992-09-11 |
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