JPS58188554A - Method for preventing clogging in tundish nozzle for continuous casting - Google Patents
Method for preventing clogging in tundish nozzle for continuous castingInfo
- Publication number
- JPS58188554A JPS58188554A JP7125182A JP7125182A JPS58188554A JP S58188554 A JPS58188554 A JP S58188554A JP 7125182 A JP7125182 A JP 7125182A JP 7125182 A JP7125182 A JP 7125182A JP S58188554 A JPS58188554 A JP S58188554A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- tundish
- molten steel
- tundish nozzle
- stirring
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/62—Pouring-nozzles with stirring or vibrating means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、連続鋳造用タンディツシュノズルの、改良
された塞り防止方法に関するものである３゜鋼の連続鋳
造においては、１つのタンディノンユを使用して多数の
ヒートを鋳造する多連鋳法が一般的である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for preventing clogging of a tundish nozzle for continuous casting. A multiple casting method is common.
この多連鋳を阻害する要因の一つに、タンディツシュノ
ズル壁面に、十溶鋼中Ａｔ２０３介在物が付着すること
によるノズル閉塞がある。One of the factors that inhibit this multiple casting is nozzle clogging due to At203 inclusions in the molten steel adhering to the tundish nozzle wall surface.
従来、このようなノズル閉塞を防止するために、例えば
、ノズル内へのアルゴンガス吹き込みなどが行なわれて
いるが、安定した充分な効果が得られていないのが現状
である。Conventionally, in order to prevent such nozzle clogging, for example, argon gas has been blown into the nozzle, but at present, a stable and sufficient effect has not been obtained.
そこで本発明者等は、以上のような問題を解消すべく研
究を行なった結果、次に示す通りの知見を得た。即ち、
実機連続鋳造機を用い、タンディツシュノズルの外側に
電磁撹拌コイルを設け、このコイルに所定時間（以下交
番撹拌時間ｔという）毎に正逆方向に電流を加えて、タ
ンディツシュノズル内を通過中の溶鋼に正逆交番の撹拌
を与えた。Therefore, the present inventors conducted research to solve the above problems, and as a result, they obtained the following knowledge. That is,
Using an actual continuous casting machine, an electromagnetic stirring coil is installed outside the tundish nozzle, and a current is applied to this coil in the forward and reverse directions at predetermined time intervals (hereinafter referred to as alternating stirring time t) while passing through the tundish nozzle. The molten steel was subjected to alternating forward and reverse stirring.
第１図は、コイルに流れる電流の一例を示しており、第
２図は交番撹拌時間ｔとタンディツシュノズル内面への
アルミナ（Ａｔ２０３）付着量指数との関係を示す図で
ある。第２図・から、交番撹拌時間ｔが５〜３０ ｓｅ
ｃで、アルミナ付着量は低く保たれ、無電磁撹拌時のア
ルミナ付着量に対して、２０〜４０％アルミナ付着量が
減った。FIG. 1 shows an example of the current flowing through the coil, and FIG. 2 is a diagram showing the relationship between the alternating stirring time t and the alumina (At203) adhesion amount index on the inner surface of the tundish nozzle. From Figure 2, the alternating stirring time t is 5 to 30 se.
In c, the amount of alumina attached was kept low, and the amount of alumina attached was reduced by 20 to 40% compared to the amount of alumina attached when no electromagnetic stirring was performed.
この発明は、上記知見に基づいてなされたもので、タン
ディツシュノズル内を通過中の溶鋼を、５〜３０秒の範
囲内の時間毎に交番撹拌する、連続鋳造用タンディツシ
ュノズルの基り防止法としたことに特徴を有する。This invention has been made based on the above findings, and is intended to prevent the formation of a tundish nozzle for continuous casting, in which molten steel passing through the tundish nozzle is alternately stirred at intervals of 5 to 30 seconds. It is characterized by the fact that it has become a law.
尚５秒より短い交番撹拌時間ｔでは、ノズル内面の溶鋼
が十分撹拌され力いために十分なノズル基り防止効果が
ない。また３０秒より長い交番撹拌時間ｔでは、ノズル
内面に到達したＡｔ２０３介在物がノズル壁と反応して
十分な固着力を持つために、かえって十分なノズル基り
防止効果が得られない。If the alternating stirring time t is shorter than 5 seconds, the molten steel on the inner surface of the nozzle will be sufficiently stirred and the force will be too strong, so that there will not be a sufficient effect of preventing the nozzle from sticking. Further, if the alternating stirring time t is longer than 30 seconds, the At203 inclusions that have reached the inner surface of the nozzle react with the nozzle wall and have sufficient adhesion strength, so that a sufficient nozzle clogging prevention effect cannot be obtained.
す々わちノズル内面近傍の溶鋼流は、一般的によく知ら
れているように、境界層（流速が非常に遅い）を形成す
る。したがってノズル内溶鋼に電磁力を与えて、これを
一方向にらせん回転させる方法（特開昭５６−７１５６
３号公報参照）や撹拌周期の長い交番撹拌では、境界層
に侵入したＡｔ２０３介在物は、ノズル壁と十分反応し
固着する。このため３０秒以下で撹拌方向を変え境界層
を破壊しなければならない。As is generally well known, the molten steel flow near the inner surface of the nozzle forms a boundary layer (the flow velocity is very slow). Therefore, there is a method of applying electromagnetic force to the molten steel in the nozzle to spirally rotate it in one direction (Japanese Patent Laid-Open No. 56-7156
(see Publication No. 3) or alternating stirring with a long stirring cycle, At203 inclusions that have entered the boundary layer sufficiently react with the nozzle wall and become fixed. Therefore, the stirring direction must be changed within 30 seconds to destroy the boundary layer.
第３図は、この発明にかかる方法を実施するだめの垂直
型２ストランドブルーム連続鋳造装置の一態様を示す断
面図である。図において、■はタンディツシュ、２はタ
ンディツシュ１の底部に設けられた２本のタンディツシ
ュノズル（浸漬ノズル）、３はタンディツシュノズル２
の外側に設けられた電磁撹拌コイル、４は鋳型、５は溶
鋼、５′は凝固シェルである。FIG. 3 is a sectional view showing one embodiment of a vertical two-strand bloom continuous casting apparatus for carrying out the method according to the present invention. In the figure, ■ is the tundish nozzle, 2 is the two tundish nozzles (immersed nozzles) provided at the bottom of the tundish 1, and 3 is the tundish nozzle 2.
4 is a mold, 5 is molten steel, and 5' is a solidified shell.
第３図に示す構造の装置を使用し、４００×５２０調の
ブルーム形状の鋳型４に、Ｃ： ０．４５１；ｊ） 、
Ｓｉ −帆２５ ％ 、 Ｍ夏コ１ ： ０．７
５ ％ 、 Ｐ ： ０．０ ２ ０チ、Ｓ
： ０．０２０係、および５ｏｔＡｔ： ０．０３５
％を含む８４５Ｃを、鋳造速度０．５ ｍ ／ ｓｅｃ
で、タンディツシュ１から、タンディツシュノズル２を
通して鋳込んだ。一方、電磁撹拌コイル３として、容量
１００ ＫＶＡ、内径２０・Ｏｍｍφ、高さ１５０咽の
旋回型電磁撹拌コイルを使用した。Using a device having the structure shown in Fig. 3, a bloom-shaped mold 4 of 400 x 520 scale was molded with C: 0.451; j),
Si-sail 25%, M summer co 1: 0.7
5%, P: 0.020chi, S
: 0.020, and 5otAt: 0.035
845C containing %, casting speed 0.5 m/sec
Then, it was cast from tanditshu 1 through tanditshu nozzle 2. On the other hand, as the electromagnetic stirring coil 3, a rotating electromagnetic stirring coil having a capacity of 100 KVA, an inner diameter of 20 mmφ, and a height of 150 mm was used.
そして、電磁撹拌コイル３に対して、条件ｌ：無撹拌（
電磁撹拌コイル３不使用）、条件２：連続一方向撹拌、
条件３：交番撹拌時間ｔ−６０ｓｅｃ、条件４：交番撹
拌時間ｔ ” １５ ｓｅｃ、の各条件で鋳造を行ない
（５チヤージ）、鋳造終了後における、タンディツシュ
ノズル内面へのアルミナ付着量を調べた。その結果を、
第４図に示す。Then, for the electromagnetic stirring coil 3, condition 1: no stirring (
(No use of electromagnetic stirring coil 3), Condition 2: Continuous unidirectional stirring,
Casting was carried out under the following conditions: condition 3: alternating stirring time t-60 sec, condition 4: alternating stirring time t'' 15 sec (5 charges), and the amount of alumina adhering to the inner surface of the tundish nozzle after casting was completed. .The result is
It is shown in Figure 4.
第４図から、本発明（条件４）によって、アルミナ付着
量が、従来無撹拌に比べて％になっていることが明らか
である。From FIG. 4, it is clear that according to the present invention (condition 4), the amount of alumina deposited is % compared to the conventional case without stirring.
以上説明したように、この発明によれば、極めて確実に
、タンディツシュノズルの塞りを防止することができる
。As explained above, according to the present invention, clogging of the tundish nozzle can be extremely reliably prevented.
第１図は電磁撹拌コイルに流れる電流の一例を示す図、
第２図は交番撹拌時間ｔとタンディツシュノズル内面へ
のアルミナ付着量指数との関係を示す図、第３図はこの
発明にかかる方法を実施するだめの垂直型２ストランド
ブルーム連続ｖｊ造装置の一態様を示す断面図、第４図
は各条件におけるアルミナ付着量を示す図である。
２・・・タンディツシュノズル ３・・・電磁撹拌ノ
ズル出願人 日本鋼管株式会社
代理人 堤 敬太部外１名
第１図
第３図
第４図
１ ２ ３ ４
手続補正書（自発）
昭和５７年 ６ 月 ７ 日
特許庁長官 島 １）春 樹 殿１、事件の表示
特願昭５７− ７１２５１ 号
２・ 発明の名称
連続鋳造用タンディツシュノズルの塞す防止法３、補正
をする者
事件との関係 特許出願人゛
住所 東京都千代田区丸の内−丁目１番２号氏名（名称
） 日本鋼管株式会社
代表者 金 尾 實
４、代理人
自発
６、補正の対象
（１） 明細書、第２頁、発明の詳細な説明第２０行
、
「４０チ」とあるを、
「４０チに」と訂正する。
（２）明細書、第３頁、発明の詳細な説明の項、第１１
行、
「かえって」とある記載を削除する，１以上Figure 1 is a diagram showing an example of the current flowing through the electromagnetic stirring coil.
Fig. 2 is a diagram showing the relationship between the alternating stirring time t and the alumina adhesion amount index on the inner surface of the tundish nozzle, and Fig. 3 is a diagram showing the vertical two-strand bloom continuous vj production apparatus for carrying out the method according to the present invention. FIG. 4, which is a cross-sectional view showing one embodiment, is a diagram showing the amount of alumina deposited under each condition. 2...Tundish nozzle 3...Electromagnetic stirring nozzle Applicant Nippon Koukan Co., Ltd. Agent Keita Tsutsumi and one other person Figure 1 Figure 3 Figure 4 Figure 1 2 3 4 Procedural amendment (voluntary) 1981 June 7th Japan Patent Office Commissioner Shima 1) Haruki Tono1, Indication of Case Patent Application No. 1971-71251 2. Title of Invention Act for Prevention of Clogging of Tundish Nozzles for Continuous Casting 3. Related Patent Applicant Address: 1-2 Marunouchi-chome, Chiyoda-ku, Tokyo Name: Nippon Kokan Co., Ltd. Representative: Minoru Kaneo 4, Agent volunteered 6, Subject of amendment (1) Specification, page 2, In line 20 of the detailed description of the invention, the phrase "40 inches" is corrected to "40 inches." (2) Specification, page 3, detailed description of the invention, section 11
line, delete the entry that says "on the contrary", 1 or more
Claims (1)
の範囲内の時間毎に交番撹拌することを特徴とする連続
鋳造用タンディツシュノズルの塞り防１Ｆ法。A 1F method for preventing clogging of a tundish nozzle for continuous casting, characterized in that molten steel passing through the tundish nozzle is alternately stirred at intervals of 5 to 30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7125182A JPS58188554A (en) | 1982-04-30 | 1982-04-30 | Method for preventing clogging in tundish nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7125182A JPS58188554A (en) | 1982-04-30 | 1982-04-30 | Method for preventing clogging in tundish nozzle for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58188554A true JPS58188554A (en) | 1983-11-04 |
Family
ID=13455294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7125182A Pending JPS58188554A (en) | 1982-04-30 | 1982-04-30 | Method for preventing clogging in tundish nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58188554A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61115654A (en) * | 1984-11-10 | 1986-06-03 | Shinko Electric Co Ltd | Continuous casting device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5671563A (en) * | 1979-11-15 | 1981-06-15 | Sumitomo Metal Ind Ltd | Continuous casting method |
-
1982
- 1982-04-30 JP JP7125182A patent/JPS58188554A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5671563A (en) * | 1979-11-15 | 1981-06-15 | Sumitomo Metal Ind Ltd | Continuous casting method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61115654A (en) * | 1984-11-10 | 1986-06-03 | Shinko Electric Co Ltd | Continuous casting device |
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