JPS58116961A - Discharging method of molten metal - Google Patents
Discharging method of molten metalInfo
- Publication number
- JPS58116961A JPS58116961A JP21233581A JP21233581A JPS58116961A JP S58116961 A JPS58116961 A JP S58116961A JP 21233581 A JP21233581 A JP 21233581A JP 21233581 A JP21233581 A JP 21233581A JP S58116961 A JPS58116961 A JP S58116961A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- molten metal
- molten
- tundish
- 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.)
- 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はタンディシュ、取鍋等の溶融金属容器において
、鋳造末期に該容器に残存させる溶融金属量を極少量に
押え、鋳造に際しての歩留を大巾に向上させることに関
するものでるる。DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to minimizing the amount of molten metal remaining in a molten metal container such as a tundish or ladle at the end of casting, thereby greatly improving the yield during casting. There's something about it.
従来溶鋼の連続鋳造において常用されるタンディシュの
形状は、底面がフラットに形成され、溶鋼の注入管が位
置し、他端に注出管が設けられて、注入管から注出管に
溶鋼流が形成され、鋳型に注湯し鋳造されてきた。The shape of a tundish, which is commonly used in conventional continuous casting of molten steel, has a flat bottom surface, where an injection pipe for molten steel is located, and a spout pipe at the other end, which allows the flow of molten steel from the injection pipe to the spout pipe. It has been formed, poured into a mold, and cast.
か\るタンディシュを用いる連続鋳造の末期においては
、溶鋼量の減少に伴い、溶鋼表面に浮上しているスラグ
、保温材が注入溶鋼に巻込まれる恐れが充分ろった。例
えばタンディシュ内残存溶鋼深さ100 IImを維持
するとき、250t/castにおいて残存量2t、8
0t/caatにおいて残存量2tが計量されたが、な
おスラグ、保温材の巻込み危険は大でめった。At the end of continuous casting using such a tundish, as the amount of molten steel decreases, there is a strong possibility that slag and heat insulating material floating on the surface of the molten steel will be caught up in the injected molten steel. For example, when maintaining the depth of residual molten steel in the tundish at 100 IIm, the remaining amount at 250t/cast is 2t, 8
Although the remaining amount of 2t was measured at 0t/caat, there was still a large risk of slag and heat insulating material getting caught.
一方、連鋳設備は生産性の向上という要請から大型化の
傾向がロシ、残存溶鋼が増大する問題が顕著である。更
に要求される鋼種の多様化に伴い、小ロツト鋳造のニー
ズが増加し、この対策が望まれている。On the other hand, continuous casting equipment tends to be larger due to the demand for improved productivity, and the problem of increased residual molten steel is becoming noticeable. Furthermore, with the diversification of required steel types, the need for small-lot casting is increasing, and countermeasures are desired.
即ち、多鋼種小ロツト化が進むに従い、250t/ca
stの鋳造が、例えば80t/castという方向にな
シ、前述したように250t、80を共2tの残湯があ
るため、250tの場合での歩留が99.2%めったも
のが、80tになれば、97.5%までも低下し、大き
な問題となる。In other words, as production of multiple steel types and smaller lots progresses, 250t/ca
For example, when casting of ST is in the direction of 80t/cast, as mentioned above, there is 2t of remaining metal for both 250t and 80, so the yield for 250t is 99.2%, but for 80t the yield is 99.2%. If this happens, it will drop to 97.5%, which will become a big problem.
更に近時非金属介在物の少ない清浄鋼の製造要求が強い
が、例えば特公昭52−36085号公報において、清
浄鋼の製造法が提案されているが、本発明は上述の問題
を解決するものであって、その要旨は溶融金属を鋳造す
る際に使用するタンディシュ、取鍋等の溶融金属容器の
底部を平坦にして溶鋼流を形成し、注出孔を含む近傍に
溶鋼の滞留域を形成し、滞留域を溶鋼へのスラグ巻込限
界tよル深くすることによシ、鋳造末期に前記容器内に
残存させる溶融金属を減少させることを特徴とする溶融
金属注出方法でアシ、更に溶融金属を鋳造するに際し使
用するタンディシュ、取鍋等溶融金属容器の底部を平坦
にして溶鋼流を形成し、注出孔を含む近傍に溶鋼の滞留
域を形成し、滞留域を溶鋼へのスラグ巻込限界tよシ深
くするとともK、鋳造末期に注出孔の溶鋼流量調整によ
シ前記容器内に残存させる溶融金属を減少させることを
特徴とする溶融金属注出方法にるる。Furthermore, recently there has been a strong demand for manufacturing clean steel with few non-metallic inclusions, and for example, a method for manufacturing clean steel has been proposed in Japanese Patent Publication No. 52-36085, but the present invention solves the above-mentioned problems. The gist of this is to flatten the bottom of a molten metal container such as a tundish or ladle used when casting molten metal to form a molten steel flow, and to form a stagnation area for molten steel near the pouring hole. The molten metal pouring method is characterized in that the molten metal remaining in the container at the end of casting is reduced by making the retention area deeper than the slag entrainment limit t in the molten steel, and further The bottom of a molten metal container such as a tundish or ladle used when casting molten metal is flattened to form a molten steel flow, a molten steel retention area is formed near the pouring hole, and the molten steel retention area is used as a slag for the molten steel. The molten metal pouring method is characterized in that the molten metal is made deeper than the entrainment limit t, and the molten metal remaining in the container is reduced by adjusting the flow rate of molten steel in the pouring hole at the end of casting.
以下本発明を図面について説明する。The present invention will be explained below with reference to the drawings.
第1図は本発明の方法を適用するタンディシュの模式図
である。図において、タンプ1シユ2は注出孔8及び注
出ノズル9が設けられ、かつ凹型部10が形成される。FIG. 1 is a schematic diagram of a tundish to which the method of the present invention is applied. In the figure, a tamp 1 and a casing 2 are provided with a pouring hole 8 and a pouring nozzle 9, and a concave portion 10 is formed.
凹型部10は常用されるタンディシュのスラグ巻込限界
値(1)よシ深くする。The concave portion 10 is made deeper than the slag entrainment limit value (1) of a commonly used tundish.
即ち本発明は、ある必要溶鋼ヘッドが必要な箇所を、注
出孔を含む近傍に絞り、この部分の形状として容器深さ
をよシ深くして残存溶鋼量を減少させたものである。That is, in the present invention, the area where a certain required molten steel head is required is narrowed down to the vicinity including the pouring hole, and the shape of this area is made to have a deeper container depth to reduce the amount of remaining molten steel.
従って本発明においては、溶鋼3カー注入管12を介し
てタンディシュ2に注湯されると平坦部11に溶鋼流が
形成されて、必要によシ介在物の浮上捕捉が行なわれる
が、鋳造末期においては、凹型部IOに溶鋼3が滞留状
態を造シ、スラグ4が層状にろってもスラグ巻込限界t
が維持されて、スラグ巻込みも生じない。Therefore, in the present invention, when the molten steel is poured into the tundish 2 through the 3-car injection pipe 12, a molten steel flow is formed in the flat part 11, and necessary inclusions are floated and captured. In this case, the molten steel 3 forms a stagnation state in the concave part IO, and even if the slag 4 is thickened in layers, the slag entrainment limit t is reached.
is maintained, and no slag entrainment occurs.
実験によればスラグ巻込み限界は第2図のようになる。According to experiments, the slag entrainment limit is as shown in Figure 2.
横軸は注出用ノズル断面積当シの流出速度を示している
。スラグ巻込み限界は、流出速度に大きな影響をうけて
おり、ち々みに80關φのノズルから4t/NRの溶鋼
を流出させる場合は、流出速度が800 t / m7
/Mjlとなシ、り・要深さが10011E以上となる
。The horizontal axis indicates the outflow velocity per cross-sectional area of the pouring nozzle. The slag entrainment limit is greatly affected by the outflow speed, and when 4t/NR of molten steel is flown out from a nozzle with a diameter of 80 mm, the outflow speed is 800t/m7.
/Mjl, the required depth is 10011E or more.
本発明の他の実施例を第3図及び第4図に示す。第3図
は溶鋼注出孔直上部にストツノ(−5を設置したもので
6D、第4図はアーム6の先端に邪魔板13を併設した
例、を示す。Another embodiment of the invention is shown in FIGS. 3 and 4. FIG. 3 shows an example in which a strut horn (-5) is installed directly above the molten steel pouring hole, 6D, and FIG. 4 shows an example in which a baffle plate 13 is installed at the tip of the arm 6.
即ち溶鋼注出口直上部にストツノく−等の流量調整機構
を設け、溶鋼ヘッドが小さくなるに従って、表層のスラ
グ、保温材等を巻き込まないよう流量を絞シ込んでいく
ことが容易でめる。That is, by providing a flow rate adjustment mechanism such as a stopper directly above the molten steel spout, as the molten steel head becomes smaller, it is easy to reduce the flow rate so as not to entrain surface slag, heat insulating material, etc.
ストッパー等で流量を絞シ込む方法の原理は、前述した
第2図のように、流出速度を抑えることによシ、スラグ
巻込み限界を下げることにろる。The principle of the method of restricting the flow rate with a stopper or the like is to lower the limit of slag entrainment by suppressing the outflow speed, as shown in FIG. 2 described above.
又、溶鋼注出口直上部に邪魔板を設置すると、設置しな
い時の溶鋼表面形状のすりばち状を改善し、表層のスラ
グ、保温材等を巻き込まないので実際的でるる。Furthermore, it is practical to install a baffle plate directly above the molten steel spout, since it improves the grooved surface shape of the molten steel when it is not installed, and prevents surface slag, heat insulating material, etc. from getting caught up in the baffle plate.
邪魔板方法の原理は、流出速度の影響を注出口直上のみ
から周囲に分散することによシ、前述したようにみかけ
上の流出速度を抑えることKある。The principle of the baffle plate method is to suppress the apparent outflow speed as described above by dispersing the influence of the outflow speed from just above the spout to the surrounding area.
更に第5図は、注出孔8の周辺部にポーラス耐火物7を
埋設した例を示す。即ち溶融金属注出口近傍周辺部にガ
ス吹込み装置を設置し、Ar等の不活性ガスを凹型内溶
鋼に吹込むことで、更に残存溶融金属量を減少させるこ
とができる。Furthermore, FIG. 5 shows an example in which a porous refractory material 7 is embedded in the periphery of the pouring hole 8. That is, by installing a gas blowing device in the vicinity of the molten metal outlet and blowing an inert gas such as Ar into the molten steel in the concave mold, the amount of remaining molten metal can be further reduced.
不活性ガス吹込みの圧力、吹込み耐火物面積等は注入孔
サイズ、タンディシュ規模によって求めることができる
。The pressure of inert gas injection, the area of the blown refractory, etc. can be determined based on the injection hole size and tundish scale.
次に250t/cast及び80t/caatについて
本発明法を従来法と比較した例を表1に示す。Next, Table 1 shows an example in which the method of the present invention was compared with the conventional method for 250t/cast and 80t/cat.
表1
本発明法は歩留の向上が著しいことが明らかである。又
鋳造鋳片について超音波探傷不良率を第6図に示す。図
面に明らかなように本発明法によると残存溶鋼量が減少
しても不良率は低いことが明らかである。Table 1 It is clear that the method of the present invention significantly improves yield. Figure 6 shows the defective rate of ultrasonic flaw detection for cast slabs. As is clear from the drawings, it is clear that according to the method of the present invention, even if the amount of remaining molten steel is reduced, the defective rate is low.
第1図(、)は本発明の断面正面図、第1図(b)は第
1図(a)の平面図、第2図はスラグ巻込み限界と流出
速度のグラフ、第3図乃至第5図は本発明の詳細な説明
図、第6図は超音波探傷不良率と残存溶鋼量のグラフで
ある。
2・・・タンディシュ 3・・・溶鋼9・・・注入
ノズル 10・・・凹型部11・・・平坦部
隼6vJ
残存煉4目量 Uoη)FIG. 1(,) is a cross-sectional front view of the present invention, FIG. 1(b) is a plan view of FIG. 1(a), FIG. 2 is a graph of the slag entrainment limit and outflow velocity, and FIGS. FIG. 5 is a detailed explanatory diagram of the present invention, and FIG. 6 is a graph of the defective rate of ultrasonic flaw detection and the amount of remaining molten steel. 2... Tundish 3... Molten steel 9... Injection nozzle 10... Concave part 11... Flat part Hayabusa 6vJ Remaining brick 4 scale Uoη)
Claims (1)
取鍋等の溶融金属容器の底部を平坦にして溶鋼流を形成
し、注出孔を含む近傍に溶鋼の滞留域を形成し、滞留域
を溶鋼へのスラグ巻込限界tより深くすることにより、
鋳造末期に前記容器内に残存させる溶融金属を減少させ
ることを特徴とする溶融金属注出方法。 2、 溶融金属を鋳造するに際し使用するタンディシュ
、取鍋等の溶融金属容器の底部を平坦にして溶鋼流を形
成し、注出孔を含む近傍に溶鋼の滞留域を形成し、滞留
域を溶鋼へのスラグ巻込限界tよシ深くするとともに、
鋳造末期に注出孔の溶鋼流量調整によシ前記容器内に残
存させる溶融金属を減少させることを特徴とする溶融金
属注出方法。 3、溶融金属注出孔にストッパーを設けて溶鋼流量調整
する特許請求の範囲第2項記載の溶融金属注出方法。 4、溶融金属注出孔周辺部から不活性ガスを吹込んで溶
鋼流量調整する特許請求の範囲第2項記載の溶融金属注
出方法。[Claims] 1. A tundish used when casting molten metal;
By flattening the bottom of a molten metal container such as a ladle to form a molten steel flow, forming a stagnation area for molten steel near the pouring hole, and making the stagnation area deeper than the limit t for slag entrainment into molten steel. ,
A method for pouring molten metal, comprising reducing the amount of molten metal remaining in the container at the end of casting. 2. Flatten the bottom of a molten metal container such as a tundish or ladle used when casting molten metal to form a molten steel flow, form a molten steel retention area near the pouring hole, and make the molten steel retention area In addition to deepening the slag entrainment limit t,
A method for pouring molten metal, which comprises reducing the amount of molten metal remaining in the container by adjusting the flow rate of molten steel in a pouring hole at the end of casting. 3. The molten metal pouring method according to claim 2, wherein a stopper is provided in the molten metal pouring hole to adjust the flow rate of the molten steel. 4. The molten metal pouring method according to claim 2, wherein the molten steel flow rate is adjusted by blowing inert gas from the periphery of the molten metal pouring hole.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21233581A JPS58116961A (en) | 1981-12-29 | 1981-12-29 | Discharging method of molten metal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21233581A JPS58116961A (en) | 1981-12-29 | 1981-12-29 | Discharging method of molten metal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58116961A true JPS58116961A (en) | 1983-07-12 |
Family
ID=16620829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21233581A Pending JPS58116961A (en) | 1981-12-29 | 1981-12-29 | Discharging method of molten metal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58116961A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61107452U (en) * | 1984-09-07 | 1986-07-08 | ||
JP2007054861A (en) * | 2005-08-24 | 2007-03-08 | Jfe Steel Kk | Tundish for continuous casting and method for producing cast slab |
-
1981
- 1981-12-29 JP JP21233581A patent/JPS58116961A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61107452U (en) * | 1984-09-07 | 1986-07-08 | ||
JP2007054861A (en) * | 2005-08-24 | 2007-03-08 | Jfe Steel Kk | Tundish for continuous casting and method for producing cast slab |
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