JPH03243256A - Sequentially continuous casting method using long nozzle - Google Patents
Sequentially continuous casting method using long nozzleInfo
- Publication number
- JPH03243256A JPH03243256A JP3615590A JP3615590A JPH03243256A JP H03243256 A JPH03243256 A JP H03243256A JP 3615590 A JP3615590 A JP 3615590A JP 3615590 A JP3615590 A JP 3615590A JP H03243256 A JPH03243256 A JP H03243256A
- Authority
- JP
- Japan
- Prior art keywords
- long nozzle
- ladle
- molten metal
- nozzle
- gas
- 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
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009749 continuous casting Methods 0.000 title claims description 9
- 239000002893 slag Substances 0.000 claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract 2
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000011109 contamination Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009848 ladle injection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002265 prevention Effects 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、ロングノズルを用いる連続連続鋳造方法に関
し、特にロングノズル内に残留している先行取鍋のスラ
グを溶融金属外に排出できる連続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 casting method using a long nozzle, and particularly to a continuous casting method that can discharge slag from a preceding ladle remaining in the long nozzle to the outside of the molten metal. This invention relates to a continuous casting method.
〈従来の技術〉
連続鋳造方法において、第7図に示すように、取鍋1か
らクンデイツシュ2に熔融金属4を注入する際に、溶融
金属の大気酸化を防止する目的でロングノズル3が一般
的に用いられている。<Prior art> In the continuous casting method, as shown in FIG. 7, a long nozzle 3 is generally used for the purpose of preventing atmospheric oxidation of the molten metal when pouring the molten metal 4 from the ladle 1 to the kundishu 2. It is used in
この際に、第7図に示すようにロングノズル内には先に
注入を終了した先行取鍋1aから流出した残留スラグ5
が溜まっている。この残留スラグ5が残っている状態の
まま後続取鍋1bから溶融金属4bの注入を行うと、ロ
ングノズル3の残留スラグ5がl容融金属4bのタンデ
インシュへの注入流によってロングツスル外に押し出さ
れて、タンデインシュの熔融金属4a巾に拡散して溶融
金属4aを汚濁するという問題があった。At this time, as shown in Fig. 7, there is residual slag 5 in the long nozzle that has flowed out from the preceding ladle 1a where the injection was completed earlier.
is accumulating. When the molten metal 4b is injected from the subsequent ladle 1b while this residual slag 5 remains, the residual slag 5 in the long nozzle 3 is pushed out of the long helix by the injection flow of the 1-volume molten metal 4b into the tundish. However, there was a problem in that the molten metal 4a of the tundish was diffused over the width of the molten metal 4a, contaminating the molten metal 4a.
〈発明が解決しようとする課題〉
本発明は、前述の従来技術の問題を解決して、クンデイ
ツシュ内溶融金属の取鍋中スラグおよび残留スラグによ
るlη濁を抑制し得るロングノズルを用いた連続連続鋳
造方法を提供するためになされたものである。<Problems to be Solved by the Invention> The present invention solves the above-mentioned problems of the prior art, and provides a continuous continuous method using a long nozzle that can suppress the turbidity of molten metal in the kundish due to slag in the ladle and residual slag. This was done to provide a casting method.
〈課題を解決するための手段〉
本発明は、取鍋とクンデイツシュとの間にロングノズル
を用い、取鍋からクンデインシュに溶融金属を注入する
際に、タンディツシュ内溶融金属に浸漬されたロングノ
ズル内に残留している先行取鍋の残留スラグを排出する
ために、ロングノズル内側にガスを供給できる通気孔を
配設し、ロングノズル上端面を後続取鍋のスライドノズ
ルの下ノズル下端面に弥・塑性耐熱シール材を介して密
着させた後、後続取鍋から溶融金属を注入する前に、前
記通気孔から非酸化性ガスを供給してロングノズル内の
圧力を高め、過剰押出し圧力Pを1.5kg/c+f1
以上にして残留スラグを排出した後、後続取鍋からの注
入を開始することを特徴とするロングノズルを用いる連
続連続鋳造方法である。<Means for Solving the Problems> The present invention uses a long nozzle between a ladle and a kundishu, and when injecting molten metal from the ladle into the kundishu, the inside of the long nozzle immersed in the molten metal in the tundish. In order to discharge the residual slag from the preceding ladle that remains in the ladle, a vent hole that can supply gas is provided inside the long nozzle, and the upper end surface of the long nozzle is placed between the lower end surface of the lower nozzle and the slide nozzle of the succeeding ladle. - After making a close contact via a plastic heat-resistant sealing material and before injecting molten metal from the subsequent ladle, non-oxidizing gas is supplied from the vent hole to increase the pressure inside the long nozzle and reduce the excessive extrusion pressure P. 1.5kg/c+f1
This is a continuous continuous casting method using a long nozzle characterized in that after the residual slag is discharged as described above, injection from a subsequent ladle is started.
ここで P=P、−ρ・h −−−−11)P
G :ガス吹込み圧力 (kg/cJ)、ρ :溶鋼比
重 (kg/cnl)、h :ロングノズル浸漬
深さ(cm)。Here, P=P, -ρ・h ------11) P
G: Gas blowing pressure (kg/cJ), ρ: Specific gravity of molten steel (kg/cnl), h: Long nozzle immersion depth (cm).
〈作 用〉
第1図に本発明に用いるロングノズルを後続取鍋の下ノ
ズル下端面に接続した断面図、第2図に残留スラグの排
出状腕を示す概念断面図を示した。<Function> FIG. 1 shows a cross-sectional view of the long nozzle used in the present invention connected to the lower end surface of the lower nozzle of the subsequent ladle, and FIG. 2 shows a conceptual cross-sectional view showing the residual slag discharge arm.
第1図に示すようにロングノズル内側にガスを供給でき
る通気孔6を具えたロングノズル3を用いる。吹込みガ
スがロングノズルの上方にリークするのを防ぐために取
鍋スライドノズルが閉、すなわち固定プレート7aと摺
動プレート7bの孔をずらした状態で、かつロングノズ
ル上端面と取鍋スライドノズル下ノズル7cの下端面と
の間には仰・塑性耐熱シール材8をはさみ込む。As shown in FIG. 1, a long nozzle 3 is used which is equipped with a vent hole 6 that can supply gas inside the long nozzle. In order to prevent the blown gas from leaking above the long nozzle, the ladle slide nozzle is closed, that is, the holes in the fixed plate 7a and the sliding plate 7b are shifted, and the upper end surface of the long nozzle and the bottom of the ladle slide nozzle are closed. A vertical plastic heat-resistant sealing material 8 is sandwiched between the nozzle 7c and the lower end surface.
下ノズル7(、下端面とロングノズル3上端面を密着さ
せた状態で通気孔6からN2、Arガスなどの非酸化性
ガスを吹き込む。A non-oxidizing gas such as N2 or Ar gas is blown through the ventilation hole 6 with the lower end surface of the lower nozzle 7 (and the upper end surface of the long nozzle 3 in close contact with each other).
このとき、クンデイツシュ内溶融金属4aに下部を浸漬
したロングノズル3内にある残留スラグ5および溶融金
属とをロングノズル3外に押し出すためにロングノズル
内を充分に高い非酸化性ガス圧力にすることによって、
ロングノズル内の残留スラグは外に押し出され、溶融金
属との比重差によって、また上吹きガスの気泡と共にす
みやかにクンデイツシュ内溶融金属4aの上方に浮上し
てしまう。従って従来のように残留スラグが熔融金属中
に拡散し、溶融金属を汚濁することを防止できる。At this time, in order to push out the residual slag 5 and molten metal inside the long nozzle 3 whose lower part is immersed in the molten metal 4a inside the long nozzle 3, the inside of the long nozzle is made to have a sufficiently high non-oxidizing gas pressure. By,
The residual slag in the long nozzle is pushed out and quickly floats above the molten metal 4a in the kundish due to the difference in specific gravity with the molten metal and together with the bubbles of the top-blown gas. Therefore, it is possible to prevent residual slag from diffusing into the molten metal and contaminating the molten metal, as in the prior art.
ここでガス吹込み圧力P、を、前記の(1)式で示す過
剰押出し圧力Pが1.5kg/cJ以上となるように選
べば残留スラグは完全に溶融金属の上方に浮上し溶融金
属外に排出される。Here, if the gas injection pressure P is selected so that the excess extrusion pressure P shown in equation (1) above is 1.5 kg/cJ or more, the residual slag will completely float above the molten metal and be removed from the molten metal. is discharged.
〈実施例〉
取鍋容1230t、タンデイ・7シユ容1170 tの
連続鋳造設備で本発明を実施した。第1表に使用したロ
ングノズルの諸元を示す。<Example> The present invention was carried out in a continuous casting facility with a ladle capacity of 1230 tons and a tanday 7-shu capacity of 1170 tons. Table 1 shows the specifications of the long nozzle used.
第3図は、先行取鍋の注入を終えた時点のロングノズル
内残留スラグの厚み分布を示したものである。本測定結
果ではノズル内に約2〜3kgのスラグが残留すること
になる。なお、この残留スラグ量は、先行取鍋の注入終
了時のスライドノズル閉動作のタイミングによって増減
するものである。FIG. 3 shows the thickness distribution of the slag remaining in the long nozzle at the time when the injection of the preceding ladle was completed. According to this measurement result, about 2 to 3 kg of slag remains in the nozzle. Note that the amount of residual slag increases or decreases depending on the timing of the slide nozzle closing operation at the end of pouring into the preceding ladle.
第4図は、吹込みガス圧力、ガス吹込み時間とスラグ排
出率の関係を示したものである。ここでスラグ排出率は
下式により計算した値である。FIG. 4 shows the relationship between the blowing gas pressure, the gas blowing time, and the slag discharge rate. Here, the slag discharge rate is a value calculated using the following formula.
A:注入終了時の残留スラグ厚み(M)、B:本発明方
法採用後の残留スラグ厚み(mm)。A: Residual slag thickness at the end of injection (M), B: Residual slag thickness after adoption of the method of the present invention (mm).
第4図から、残留スラグを排出するためには吹込みガス
圧力が2 kg / c−以上、吹込み時間が10秒以
上の条件で行う必要がある。From FIG. 4, in order to discharge the residual slag, it is necessary to carry out the blowing gas pressure at 2 kg/c- or more and the blowing time at 10 seconds or more.
第5図は、上記の結果を他設備でも応用できるようにす
るため押出し過剰圧力とスラグ排出率の関係を示したも
のである。FIG. 5 shows the relationship between extrusion overpressure and slag discharge rate so that the above results can be applied to other equipment.
ここで押出過剰圧力P (kg/cIll)は下式によ
る。Here, the extrusion excess pressure P (kg/cIll) is determined by the following formula.
P=PG〜ρ・h −一一−−−−(
])PG :ガス吹込み圧力 (kg/c++1)、ρ
:溶融比重 (kg / c! )、h :ロ
ングノズル浸漬法さ(cm)、(第1図参照)。P=PG~ρ・h −11−−−−(
]) PG: Gas blowing pressure (kg/c++1), ρ
: Melt specific gravity (kg/c!), h : Long nozzle immersion method height (cm), (see Figure 1).
第5図から押出過剰圧力が1.5kg/cj以上でその
効果が顕著であることがわかる。It can be seen from FIG. 5 that the effect is significant when the extrusion overpressure is 1.5 kg/cj or more.
第6図には本発明方法(P : 2〜2.5 kg/c
+fl、吹込み時間=15秒)を採用した場合と採用し
ない従来法との低度Alキルド鋼におけるタンディツシ
ュ内鋼中全酸素濃度の比率を示す。図から明らかなよう
に本発明方法によると鋼中全酸素濃度が改善されている
ことがわかる。Figure 6 shows the method of the present invention (P: 2-2.5 kg/c
The ratio of the total oxygen concentration in the inner steel of the tundish in the low-aluminum killed steel with and without the conventional method is shown. As is clear from the figure, it can be seen that the method of the present invention improves the total oxygen concentration in the steel.
ここで、タンディツシュ内鋼中全酸素濃度指数は下式に
よって算出した値である。Here, the total oxygen concentration index in the inner steel of the tanditshu is a value calculated by the following formula.
タンディツシュ内鋼中全酸素濃度指数
第1表
〈発明の効果〉
本発明方法によると、前述のとおりロングノズル内残留
スラグおよび先行取鍋中スラグによるクンデイツシュ内
熔融金属の汚濁を完全に防止することができる。Table 1 Total Oxygen Concentration Index in the Steel Inside the Kunditsu <Effects of the Invention> According to the method of the present invention, as mentioned above, it is possible to completely prevent the contamination of the molten metal in the Kunditsu due to the residual slag in the long nozzle and the slag in the preceding ladle. can.
第1図は、本発明に用いるロングノズルを後続取鍋の下
ノズル下端面に接続した断面図、第2図は、本発明方法
による後続取鍋注入前のロングノズル内残留スラグの排
出状況を示す概念断面図、第3図は、実施例における先
行取鍋注入終了時のロングノズル内残留スラグの厚み分
布を示すヒストグラム、第4図は、実施例における吹込
みガス圧力、ガス吹込み時間とスラグ排出率との関係を
示した特性図、第5図は、ロングノズル内内圧の押出し
過剰圧力とスラグ排出率との関係を示した特性図、第6
図は、タンディツシュ内鋼中全酸素濃度指数を示すヒス
トグラム、第7図は、溶融金属の連続連続鋳造方法にお
いて取鍋とタンデイツシユと間に溶融金属注入流酸化防
止用ロングノズルを用いる場合の概念断面図で、(a)
は先行取鍋の鋳込終了後、(b)は後続取鍋の鋳込開始
前を示す。
4a・・・クンデイツシュ内熔融金属、4b・・・取鍋
内溶融金属、
5 ・・・残留スラグ、
6 ・・・通気孔、
7a・・・スライドノズル固定プレート、7b・・・ス
ライドノズル摺動プレート、7c・・・スライドノズル
下ノズル、
8 ・・・弾・塑性耐熱シール材、
9 ・・・取鍋中スラグ。
1a・・・先行取鍋、
Ib・・・後続取鍋、
2 ・・・タンディツシュ、
3 ・・・ロングノズル、Fig. 1 is a sectional view of the long nozzle used in the present invention connected to the lower end surface of the lower nozzle of the succeeding ladle, and Fig. 2 shows the state of discharge of residual slag in the long nozzle before pouring into the succeeding ladle by the method of the present invention. Fig. 3 is a histogram showing the thickness distribution of the residual slag in the long nozzle at the end of the preceding ladle injection in the example, and Fig. 4 shows the blowing gas pressure and gas blowing time in the example. Figure 5 is a characteristic diagram showing the relationship between the slag discharge rate and Fig. 6.
The figure is a histogram showing the total oxygen concentration index in the steel inside the tundish. Figure 7 is a conceptual cross-section when a long nozzle for oxidation prevention of molten metal injection flow is used between the ladle and the tundish in a continuous continuous casting method of molten metal. In the figure, (a)
(b) shows after the preceding ladle has finished casting, and (b) shows before the succeeding ladle starts casting. 4a... Molten metal in the kundishu, 4b... Molten metal in the ladle, 5... Residual slag, 6... Ventilation hole, 7a... Slide nozzle fixing plate, 7b... Slide nozzle sliding Plate, 7c...Slide nozzle lower nozzle, 8...Elastic/plastic heat-resistant sealing material, 9...Slag in ladle. 1a...Advanced ladle, Ib...Following ladle, 2...Tandish, 3...Long nozzle,
Claims (1)
取鍋からタンディッシュに溶融金属を注入する際に、タ
ンディッシュ内溶融金属に浸漬されたロングノズル内に
残留している先行取鍋の残留スラグを排出するために、 ロングノズル内側にガスを供給できる通気孔を配設し、
ロングノズル上端面を後続取鍋のスライドノズルの下ノ
ズル下端面に弾・塑性耐熱シール材を介して密着させた
後、後続取鍋から溶融金属を注入する前に、前記通気孔
から非酸化性ガスを供給してロングノズル内の圧力を高
め、過剰押出し圧力Pを1.5kg/cm^2以上にし
て残留スラグを排出した後、後続取鍋からの注入を開始
することを特徴とするロングノズルを用いる連続連続鋳
造方法。 ここでP=P_G−ρ・h…………(1) P_G:ガス吹込み圧力(kg/cm^2)、ρ:溶鋼
比重(kg/cm^2)、 h:ロングノズル浸漬深さ(cm)。[Claims] A long nozzle is used between the ladle and the tundish,
When pouring molten metal from the ladle into the tundish, gas is supplied to the inside of the long nozzle to discharge residual slag from the preceding ladle that remains in the long nozzle immersed in the molten metal in the tundish. Provide ventilation holes that allow
After the upper end surface of the long nozzle is brought into close contact with the lower end surface of the lower nozzle of the slide nozzle of the succeeding ladle via an elastic/plastic heat-resistant sealing material, before injecting molten metal from the succeeding ladle, a non-oxidizing A long nozzle characterized by supplying gas to increase the pressure inside the long nozzle, increasing the excess extrusion pressure P to 1.5 kg/cm^2 or more, discharging the residual slag, and then starting injection from the subsequent ladle. Continuous continuous casting method using a nozzle. Here, P=P_G−ρ・h……(1) P_G: Gas blowing pressure (kg/cm^2), ρ: Molten steel specific gravity (kg/cm^2), h: Long nozzle immersion depth ( cm).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3615590A JPH03243256A (en) | 1990-02-19 | 1990-02-19 | Sequentially continuous casting method using long nozzle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3615590A JPH03243256A (en) | 1990-02-19 | 1990-02-19 | Sequentially continuous casting method using long nozzle |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03243256A true JPH03243256A (en) | 1991-10-30 |
Family
ID=12461889
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3615590A Pending JPH03243256A (en) | 1990-02-19 | 1990-02-19 | Sequentially continuous casting method using long nozzle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03243256A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5170353B1 (en) * | 2012-06-29 | 2013-03-27 | 新日鐵住金株式会社 | How to start supplying molten steel |
JP2013542856A (en) * | 2010-11-11 | 2013-11-28 | エルハーイー・アーゲー | Floor casting nozzle for placement at the bottom of metallurgical containers |
-
1990
- 1990-02-19 JP JP3615590A patent/JPH03243256A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013542856A (en) * | 2010-11-11 | 2013-11-28 | エルハーイー・アーゲー | Floor casting nozzle for placement at the bottom of metallurgical containers |
JP5170353B1 (en) * | 2012-06-29 | 2013-03-27 | 新日鐵住金株式会社 | How to start supplying molten steel |
CN103648685A (en) * | 2012-06-29 | 2014-03-19 | 新日铁住金株式会社 | Method for starting supply of molten steel |
CN103648685B (en) * | 2012-06-29 | 2015-03-18 | 新日铁住金株式会社 | Method for starting supply of molten steel |
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