JPS6174762A - Continuous casting method of different steel kind - Google Patents
Continuous casting method of different steel kindInfo
- Publication number
- JPS6174762A JPS6174762A JP19747584A JP19747584A JPS6174762A JP S6174762 A JPS6174762 A JP S6174762A JP 19747584 A JP19747584 A JP 19747584A JP 19747584 A JP19747584 A JP 19747584A JP S6174762 A JPS6174762 A JP S6174762A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- tundish
- casting
- previous
- molten steel
- 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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/42—Features relating to gas injection
-
- 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
- B22D11/08—Accessories for starting the casting procedure
- B22D11/086—Means for connecting cast ingots of different sizes or compositions
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）
本発明は、異鋼櫃の連１読鋳造方法に係シ、特に異鋼種
の混合部切捨量減少による歩留シ向上を達成し得る異鋼
種の連続鋳造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 continuous one-shot casting method for dissimilar steel boxes, and in particular can improve yield by reducing the amount of cut-off in the mixed portion of different steels. This relates to a continuous casting method for different steel types.
（従来の技術〕
異鋼種の溶鋼を連続鋳造する方法として従来は、前回の
鋳込み終了時には、溶鋼の表面に浮遊するスラグがタン
ディツシュから鋳型内に注入されない時点でスラグを残
溜させて注入を止め、しかる後鋳型内の訃面上に前回鋼
１と次回鋼種を区分するための、いわゆる仕切板を挿入
し、その後に次回鋼種の鋳造を開始する方法が採用され
ていた。(Prior art) Conventionally, as a method for continuously casting molten steel of different steel types, at the end of the previous casting, when the slag floating on the surface of the molten steel is not injected into the mold from the tundish, the slag remains and the injection is stopped. After that, a so-called partition plate was inserted on the dead surface of the mold to separate the previous steel 1 and the next steel grade, and then casting of the next steel grade was started.
（発明が解決しようとする問題点）
しかしながら先に述べた鋳造方法では以下に示すような
間１点を有している。(Problems to be Solved by the Invention) However, the above-mentioned casting method has one drawback as shown below.
■前回鋼種と次回鋼種との混合部切捨鋳片の増加による
歩留シ低下
前回鋼ｄの鋳込み終了は、鋳型内へのスラグの流出を防
ぐため、タンデイツ７ユ内に溶鋼を３０優等度残してお
り、この中に次回鋼種の溶鋼を注入する為、前回鋼種の
溶鋼の影響のある混合部鋳片の切捨量が増加して歩留り
が低下する。■ Yield decrease due to increase in cut-off slabs in the mixing area between the previous steel grade and the next steel grade.When finishing casting the previous steel d, in order to prevent slag from flowing into the mold, the molten steel was poured into a tandate 7U with a grade of 30. Since molten steel of the next steel grade is injected into this, the amount of mixed section slabs that are affected by the molten steel of the previous steel grade increases and the yield decreases.
■鋳片接続部における漏鋼事故の発生
前回鋼種の溶鋼と次回鋼種の溶鋼との境界は、簡単な仕
切板を挿入して溶鋼の凝固シェルで接続しているため、
凝固不良等により漏鋼事故が発生し易い。■ Occurrence of steel leakage accidents at slab joints The boundary between molten steel of the previous steel grade and molten steel of the next steel grade is connected by a solidified shell of molten steel by inserting a simple partition plate.
Steel leakage accidents are likely to occur due to poor solidification, etc.
■前回１１種の溶鋼と次回鋼種の溶鋼との境界部鋳片の
品質低下
■前回鋼種の溶鋼がタンディツシュ内に残るため、成分
偏析となり異常鋳片が発生する。■Deterioration in the quality of the slab at the boundary between the 11 previous grades of molten steel and the next grade of molten steel.■As the molten steel of the previous grade remains in the tundish, component segregation occurs and abnormal slabs are generated.
■前回鋼種の溶鋼と次回鋼種の溶鋼との境界部は、簡単
な仕切板を挿入しただけであるため、凝固不良等により
仕切が不安定である。従って次回鋼種の溶鋼が前回鋳片
内に流入して異常鋳片となる場合がある。■A simple partition plate is inserted at the boundary between molten steel of the previous steel grade and molten steel of the next steel grade, so the partition is unstable due to poor solidification, etc. Therefore, molten steel of the next steel type may flow into the previous slab, resulting in an abnormal slab.
６次回鋼種の溶鋼をタンディツシュに注入する時、タン
ディツシュ内の溶鋼ヘッドが低下しているため、スラグ
のタタキ込み現象が起こシ介在物が増加する。When molten steel of the 6th grade steel is poured into the tundish, the head of the molten steel in the tundish is lowered, which causes slag slapping and inclusions to increase.
■次回鋼種の鋳込みの際のタンデイツ／ユ開孔時、上部
ノズル内は凝固しているため酸素ガスにて洗滌開孔する
。従って、酸化物が増加し、介在物が発生する。■When drilling holes for the next casting of the steel type, the inside of the upper nozzle will be solidified, so clean it with oxygen gas and open the hole. Therefore, oxides increase and inclusions occur.
（問題点を解決するための手段〕
本発明は上記問題点を解決せんとして成されたものであ
シ、その要旨は、同一タンディツシュを用いて異鋼種溶
鋼を連続鋳造する方法において、前記タンデイノンユ底
部のノズルに取付けられた固定盤の内周部に、その内周
面に複数条のスリットを設けた耐溶損性耐火物からなる
リング金装着すると共に、更に外部から前記スリットに
連通するガス導入孔が設けられた溶融金属排出装置を用
いてガスバブリングを行うことにより、スラグと溶鋼を
分離し、前回鋼種の鋳造を、タンディツシュ内残鋼がタ
ンディツシュ容量の２０−以下となるようにして終了せ
しめ、しかる後同様にガスバブリングを行うことによっ
て前記ノズル部の凝固閉塞を防止しながら継手ブロック
を鋳型内に挿入せしめた後、前回鋼種と異なる次回鋼種
の鋳造を開始することにある。(Means for Solving the Problems) The present invention has been made to solve the above problems, and the gist thereof is to provide a method for continuously casting molten steel of different steel types using the same tundish. A ring metal made of erosion-resistant refractory material with multiple slits provided on the inner periphery of the fixed plate attached to the nozzle is attached to the inner periphery of the fixed plate, and a gas introduction hole communicating with the slits from the outside is attached. slag and molten steel are separated by performing gas bubbling using a molten metal discharge device equipped with a molten metal discharge device, and the casting of the previous steel type is completed so that the residual steel in the tundish becomes 20- or less of the tundish capacity, Thereafter, the joint block is inserted into the mold while preventing solidification and clogging of the nozzle portion by performing gas bubbling in the same manner, and then casting of the next steel type different from the previous steel type is started.
すなわち、本発明の第１の特徴は、第２図に示すように
、固定盤（υの内周部に、その内周面に週数条の環状ス
リットを設けた例えばアルミナ系又はジルコン系等の耐
溶損性耐火物からなるリング＋２＋を装着し、かつ、該
リング（２）の前記スリットに外部から連通するガス導
入孔（３１を設けてなる溶融金属排出４ｔＱｔ４１を用
いてガスバブリングを行うことにより、タンディツシュ
（５）内のスラグと溶鋼を分離せしめ、タンディツシュ
内残鋼が可及的に少量となるまで鋳造できるようにした
ことである。That is, the first feature of the present invention is that, as shown in FIG. Gas bubbling is performed using a molten metal discharge 4tQt41, which is equipped with a ring +2+ made of an elution-resistant refractory, and is provided with a gas introduction hole (31) that communicates with the slit of the ring (2) from the outside. As a result, the slag and molten steel in the tundish (5) are separated, and casting can be performed until the remaining steel in the tundish is reduced to the smallest possible amount.
これにより、前回鋼種と次回鋼種との混合部切捨鋳片が
減少し歩留シが向上する。即ち、前回鋼種の溶鋼と次回
鋼種の溶鋼との境界部鋳片の品質低下部が減少するので
ある。As a result, the amount of cut-off slabs in the mixed portion of the previous steel grade and the next steel grade is reduced, and the yield is improved. In other words, the quality deterioration of the slab at the boundary between the molten steel of the previous steel grade and the molten steel of the next steel grade is reduced.
本発明の第２の特徴は、前回鋳込溶鋼と次回鋳込溶鋼と
の鋳片接続部に、例えば第３図に示すような形状の継手
ブロック（６）を採用していることであり、このような
継手ブロック（６１を用いることで従来の簡単な仕切板
を採用していた時のような凝固不良等による漏清事故の
発生が防止できる。The second feature of the present invention is that a joint block (6) having a shape as shown in FIG. 3, for example, is employed at the slab connection between the previously cast molten steel and the next cast molten steel, By using such a joint block (61), it is possible to prevent the occurrence of water leakage accidents due to poor coagulation, etc., which occurs when conventional simple partition plates are used.
更に本考案の第３の特徴は、前回溶鋼の鋳込み終了後次
回溶鋼の鋳造開始までの間ガスバブリングを行うことに
ある。Furthermore, the third feature of the present invention is that gas bubbling is performed after the previous molten steel casting is completed until the next molten steel casting is started.
これによう、次回溶鋼の鋳造時は自然開孔で開始でき、
従来のようにｏ１ガスによる開孔作業は廃止でき介在物
の発生を防止できる。As a result, the next time you cast molten steel, you can start with natural holes.
The conventional hole-opening operation using O1 gas can be eliminated, and the generation of inclusions can be prevented.
なお、図中■は上ノズル、ｔ８１Ｈスライド盤、（９＋
は下ノズル、頭は鋳型である。In addition, ■ in the figure is the upper nozzle, t81H slide plate, (9+
is the lower nozzle, and the head is the mold.
次（本発明において、前回溶鋼のタンディツシュ内残鋼
がタンディツシュ容量の２０−以下とした理由は、２０
チを超えた場合には以下に示す実施例よシ明らかな如く
前回溶鋼と次回溶鋼の混合部が長くなって歩留）が悪く
なシ、本発明の効果を期待できないからである。Next (In the present invention, the reason why the residual steel in the tundish of the previous molten steel is set to be less than 20 - of the tundish capacity is 20
This is because, if this exceeds 1, the mixing zone between the previous molten steel and the next molten steel becomes long, resulting in poor yield, as is clear from the examples shown below, and the effects of the present invention cannot be expected.
（実施例）
以下に示す条件で本発明方法により異ｔＸＳの連続鋳造
を行った。(Example) Continuous casting of different tXS was performed by the method of the present invention under the conditions shown below.
■ガス圧力 ７麺／−
■ガス流量 １００ｔ／−に
■ガス成分 ムｒガス
第４図は本発明方法により製造した鋳片の異鋼種混同部
の偏析（成分差≦４０ポイント）の実験結果を示したも
のであり、同図よプ明らかな如く本発明方法（タンディ
ツシュ内残鋼が２０−以下）によれば異鋼種混合部の偏
析量が少なく、かつ混合部の鋳片長さの短い鋳片が得ら
れた。■Gas pressure 7 n/- ■Gas flow rate 100 t/- ■Gas composition Mur gas Figure 4 shows the experimental results of segregation (component difference ≦ 40 points) in the mixed steel types of slabs produced by the method of the present invention. As is clear from the figure, according to the method of the present invention (residual steel in the tundish is 20 or less), the amount of segregation in the mixed steel part is small and the length of the slab in the mixed part is short. was gotten.
（発明の効果）
以上述べた如く本発明方法は、ガスバブリングを行いな
がら鋳造する為、タンディツシュ内の溶鋼とスラグを分
離できてタンディツシュ内残鋼が可及的に少量となるま
で鋳造でき、よって前回溶鋼と次回溶鋼の混合部が少な
くなって歩留りが向上し、かつ偏析量も少なくなる。ま
た本発明方法は前回溶鋼と次回溶鋼の接続部に従来の簡
単な仕切板に代えて継手ブロックを採用する為、凝固不
良等による漏鋼事故が防止できる等従来方法のイしてい
た欠点を解決できる大なる効果を有する。(Effects of the Invention) As described above, the method of the present invention performs casting while performing gas bubbling, so that the molten steel and slag in the tundish can be separated and the remaining steel in the tundish can be cast as small as possible. The mixing area of the previous molten steel and the next molten steel is reduced, improving the yield and reducing the amount of segregation. In addition, the method of the present invention uses a joint block instead of the conventional simple partition plate at the connection between the previous molten steel and the next molten steel, so it eliminates the drawbacks of the conventional method, such as preventing steel leakage accidents due to poor solidification. It has a great effect on solving problems.
第１図（イ）〜（ハ）は本発明方法の説明図、第２図は
本発明方法に使用する溶融金属排出装置の一例を示す縦
断面図、第３図は同じく本発明方法に使用する継手ブロ
ックの一例を示す斜視図、第４図は本発明方法の実施例
を示す俸昇碍魯−ｐｐ４偏析量と混合部鋳片長さの関係
図でちる。
（υは固定盤、（２１はリング、（３）はガス導入管、
（４１は溶融金属排出装置、（６）は継手ブロック、（
７）は上ノズル。
特許出願人 住友金属工業株式会社
第１図
（リ αυ （ハ）
第２図
第４図
↓Ｌ合叩Ｓ片長飄）Figures 1 (a) to (c) are explanatory diagrams of the method of the present invention, Figure 2 is a longitudinal sectional view showing an example of a molten metal discharge device used in the method of the present invention, and Figure 3 is also used in the method of the present invention. FIG. 4 is a perspective view showing an example of a joint block, and FIG. 4 is a diagram showing the relationship between the amount of PP4 segregation and the length of the slab in the mixing section, showing an embodiment of the method of the present invention. (υ is a fixed plate, (21 is a ring, (3) is a gas introduction pipe,
(41 is the molten metal discharge device, (6) is the joint block, (
7) is the upper nozzle. Patent applicant: Sumitomo Metal Industries, Ltd. Figure 1 (R αυ (C) Figure 2 Figure 4 ↓ L combination S one length)
Claims (1)
鋳造する方法において、前記タンデイツシユ底部のノズ
ルに取付けられた固定盤の内周部に、その内周面に複数
条のスリツトを設けた耐溶損性耐火物からなるリングを
装着すると共に、更に外部から前記スリツトに連通する
ガス導入孔が設けられた溶融金属排出装置を用いてガス
バブリングを行うことにより前回鋼種の鋳造を、タンデ
イツシユ内残鋼がタンデイツシユ容量の２０％以下とな
るようにして終了せしめ、しかる後ガスバブリングによ
り前記ノズル部の凝固閉塞を防止しながら継手ブロツク
を鋳型内に挿入せしめた後、前回鋼種と異なる次回鋼種
の鋳造を開始することを特徴とする異鋼種の連続鋳造方
法。(1) In a method of continuously casting molten steel of different steel types using the same tundish, a plurality of slits are provided on the inner peripheral surface of a fixed plate attached to a nozzle at the bottom of the tundish to prevent melting and damage. By attaching a ring made of a steel refractory and performing gas bubbling using a molten metal discharge device equipped with a gas introduction hole that communicates with the slit from the outside, the remaining steel in the tundish is removed from the casting of the previous steel type. The process is finished so that the tundish capacity is 20% or less, and then the joint block is inserted into the mold while preventing solidification and clogging of the nozzle part by gas bubbling, and casting of the next steel type different from the previous steel type is started. A continuous casting method for different steel types.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19747584A JPS6174762A (en) | 1984-09-19 | 1984-09-19 | Continuous casting method of different steel kind |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19747584A JPS6174762A (en) | 1984-09-19 | 1984-09-19 | Continuous casting method of different steel kind |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6174762A true JPS6174762A (en) | 1986-04-17 |
| JPH0462826B2 JPH0462826B2 (en) | 1992-10-07 |
Family
ID=16375098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19747584A Granted JPS6174762A (en) | 1984-09-19 | 1984-09-19 | Continuous casting method of different steel kind |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6174762A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0270360A (en) * | 1988-09-07 | 1990-03-09 | Kawasaki Steel Corp | Continuous casting method |
| CN103586434A (en) * | 2013-11-21 | 2014-02-19 | 武汉钢铁(集团)公司 | Non-exchange middle ladle carbon difference >/=0.40% continuous casting different steel casting method |
| CN113927010A (en) * | 2021-08-30 | 2022-01-14 | 山东钢铁集团日照有限公司 | Quick change method for double-flow plate blank tundish |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4600095B2 (en) * | 2005-03-11 | 2010-12-15 | Ｊｆｅスチール株式会社 | Hot reuse of tundish |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551945A (en) * | 1978-06-20 | 1980-01-09 | Kawasaki Steel Corp | Continuous casting method of dissimilar kind molten steel |
| JPS57130761A (en) * | 1981-02-03 | 1982-08-13 | Nippon Kokan Kk <Nkk> | Sliding nozzle device of vessel for molten metal |
-
1984
- 1984-09-19 JP JP19747584A patent/JPS6174762A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551945A (en) * | 1978-06-20 | 1980-01-09 | Kawasaki Steel Corp | Continuous casting method of dissimilar kind molten steel |
| JPS57130761A (en) * | 1981-02-03 | 1982-08-13 | Nippon Kokan Kk <Nkk> | Sliding nozzle device of vessel for molten metal |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0270360A (en) * | 1988-09-07 | 1990-03-09 | Kawasaki Steel Corp | Continuous casting method |
| CN103586434A (en) * | 2013-11-21 | 2014-02-19 | 武汉钢铁(集团)公司 | Non-exchange middle ladle carbon difference >/=0.40% continuous casting different steel casting method |
| CN103586434B (en) * | 2013-11-21 | 2015-11-04 | 武汉钢铁(集团)公司 | Do not change middle bag carbon poor >=the different steel casting method of 0.40% continuous casting |
| CN113927010A (en) * | 2021-08-30 | 2022-01-14 | 山东钢铁集团日照有限公司 | Quick change method for double-flow plate blank tundish |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0462826B2 (en) | 1992-10-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3789911A (en) | Process for continuous continuous casting of hot liquid metals | |
| JPS6174762A (en) | Continuous casting method of different steel kind | |
| EP0211476B1 (en) | Submerged nozzle for use in the continuous casting of slabs | |
| US4630668A (en) | Integral casting apparatus for use in continuous casting of molten metal | |
| CA1234961A (en) | Tundish with fluid flow control structure | |
| JPS61189848A (en) | Continuous casting method | |
| KR100244629B1 (en) | Tundish long nozzle | |
| JP3642015B2 (en) | Stainless steel continuous casting method | |
| JPS608133B2 (en) | Continuous steel casting method | |
| SU1133019A1 (en) | Method of obtaining semikilled steel ingots | |
| JPS611458A (en) | Continuous casting method of different kinds of metal | |
| JPS6145149Y2 (en) | ||
| JPH09192799A (en) | Method for preventing clogging of immersion nozzle in continuous casting | |
| KR20030006138A (en) | Solidification preventing method for ladle upper nozzle | |
| JPS61119358A (en) | Continuous casting method | |
| JPS61147953A (en) | Continuous casting method in which tundish having divided vessels is used | |
| SU1600915A1 (en) | Arrangement for pouring metals | |
| JPH0592241A (en) | Continuous casting method for different kinds of steels | |
| KR960001356Y1 (en) | Filter type cover brick of continuously casting tundish | |
| SU835613A1 (en) | Method of eliminating ingot skin breaking at metal continuous casting | |
| RU2165332C2 (en) | Method of operation of composite mold for steel continuous casting | |
| JP2710093B2 (en) | How to use tundish continuously | |
| JPH01127159A (en) | Continuous casting method for different steel kinds | |
| JPS62224461A (en) | Slag removing method in tundish | |
| JPS58116958A (en) | Continuous casting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |