JPS63188459A - Continuous casting method for round cast billet - Google Patents
Continuous casting method for round cast billetInfo
- Publication number
- JPS63188459A JPS63188459A JP2152887A JP2152887A JPS63188459A JP S63188459 A JPS63188459 A JP S63188459A JP 2152887 A JP2152887 A JP 2152887A JP 2152887 A JP2152887 A JP 2152887A JP S63188459 A JPS63188459 A JP S63188459A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- depth
- casting
- cast billet
- submerged nozzle
- 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
- 238000009749 continuous casting Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 38
- 238000005266 casting Methods 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 238000007654 immersion Methods 0.000 claims description 20
- 230000000704 physical effect Effects 0.000 claims description 4
- 230000005499 meniscus Effects 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 238000005461 lubrication Methods 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
この発明は丸鋳片の連続鋳造技術に係り、より詳しくは
単孔ストレートノズル
実施しながらパウダーキャスティングを行なう場合に、
パウダーに起因する鋳片表面欠陥およびブレークアウト
を防止する丸鋳片連続鋳造方法に関する。[Detailed Description of the Invention] Industrial Application Field This invention relates to continuous casting technology for round slabs, and more specifically, when powder casting is performed using a single-hole straight nozzle,
This invention relates to a method for continuous casting of round slabs that prevents surface defects and breakouts of slabs caused by powder.
従来技術とその問題点
近年、連続鋳造技術の進歩は著しく、最近は丸鋳片（小
径断面ビレット）を連続鋳造する方法が行なわれている
。丸鋳片の場合はスラブ等の矩形モールドに替えてチュ
ーブラ−モールドを使用して連続鋳造されるが、凝固シ
ェルの再溶解防止のために単孔ストレート浸漬ノズルを
使用し、等軸品生成のために電１ａＪｊｆ拌を実施して
パウダーキャスティングが行なわれる。Prior art and its problems Continuous casting technology has made remarkable progress in recent years, and a method of continuously casting round slabs (small diameter cross-section billets) has recently been used. In the case of round slabs, continuous casting is performed using a tubular mold instead of a rectangular mold such as a slab, but a single-hole straight immersion nozzle is used to prevent the solidified shell from remelting, and it is possible to produce equiaxed products. For this purpose, powder casting is carried out by performing electric 1aJjf stirring.
しかし、単孔ストレート浸漬ノズルを用い電磁撹拌を実
施しながらパウダーキャスティングを行なう場合、浸漬
ノズルの深さと電Ｉａ撹拌力のバランスがくずれた場合
にモールド内の溶融パウダ一層厚みがモールド近傍で薄
くなり、鋳片表面欠陥が発生したり、モールドと凝固シ
ェルが焼付いて鋳片がモールドに拘束されることがある
。表面欠陥および鋳片拘束は歩留りの悪化をもたらし、
特に鋳片拘束は、ブレークアウトの危険性があるため、
可及的に防止する必要がある。However, when performing powder casting while performing electromagnetic stirring using a single-hole straight immersion nozzle, if the balance between the depth of the immersion nozzle and the electromagnetic stirring force is lost, the thickness of the molten powder in the mold becomes thinner near the mold. , surface defects may occur in the slab, or the mold and solidified shell may seize, resulting in the slab being restrained by the mold. Surface defects and slab restriction cause yield deterioration,
In particular, slab restraint has the risk of breakout.
It is necessary to prevent this as much as possible.
問題点を解決するための手段
この発明は従来の前記問題点、すなわち丸鋳片の連続鋳
造において浸漬ノズルの深さと電磁撹拌力のバランスが
くずれた場合に発生するパウダー起因の表面欠陥および
鋳片拘束を防止する手段として、電磁撹拌力、鋳込速度
およびパウダー物性（粘性、融点）に基づいて浸漬ノズ
ル深さを制御することにより、メニスカスにおいてモー
ルド近傍の溶融パウダ一層厚の確保と浸漬ノズル近傍の
溶融パウダーのサクションを防止し、表面欠陥と鋳片拘
束の防止を可能とした丸鋳片連続鋳造方法を提案するも
のである。Means for Solving the Problems This invention solves the above-mentioned conventional problems, namely, surface defects caused by powder and slabs that occur when the balance between the depth of the immersion nozzle and the electromagnetic stirring force is lost during continuous casting of round slabs. As a means to prevent binding, by controlling the depth of the immersion nozzle based on the electromagnetic stirring force, casting speed, and powder physical properties (viscosity, melting point), the thickness of the molten powder near the mold can be ensured at the meniscus, and the depth near the immersion nozzle can be increased. This paper proposes a method for continuous casting of round slabs that prevents suction of molten powder, surface defects, and slab restriction.
以下、この発明について詳細に説明する。This invention will be explained in detail below.
単孔ストレー］・浸漬ノズルを用い電磁撹拌を実施して
丸鋳片を連続鋳造するに際し、電磁撹拌力が強い場合、
あるいは鋳込速度が速い場合にはモールド内での溶鋼の
回転流速が大きくなり、比重の差により溶融パウダーが
浸漬ノズル近傍に吸い寄せられ、モールド内壁側のパウ
ダー溶融層厚が薄くなる。また、浸漬ノズルの深さが浅
い場合も同様にモールド内壁側のパウダー溶融層厚が薄
くなる。この場合、わずかな湯面レベルの変動によって
も焼結パウダーが凝固シェルにトラップされ、炭素のガ
ス化反応によるピンホール状の表面欠陥が発生する。従
って、鋳片の表面欠陥や鋳片拘束を防止するためには、
溶融パウダーの厚み制御を適正に行ない、モールド近傍
でのパウダー溶融層厚を確保する必要がある。Single Hole Stray] - When continuously casting round slabs using electromagnetic stirring using a submerged nozzle, if the electromagnetic stirring force is strong,
Alternatively, when the casting speed is high, the rotational flow rate of the molten steel in the mold increases, and the difference in specific gravity causes the molten powder to be attracted to the vicinity of the immersion nozzle, and the thickness of the molten powder layer on the inner wall of the mold becomes thinner. Furthermore, when the depth of the immersion nozzle is shallow, the thickness of the molten powder layer on the inner wall of the mold becomes thin as well. In this case, the sintered powder is trapped in the solidified shell even by slight fluctuations in the hot water level, and pinhole-like surface defects are generated due to the carbon gasification reaction. Therefore, in order to prevent surface defects and slab restriction,
It is necessary to properly control the thickness of the molten powder to ensure the thickness of the molten powder layer near the mold.
モールド近傍でのパウダー溶融層厚を確保するためには
、浸漬ノズル近傍への溶融パウダーの引込まれ現象を防
止する必要がある。この引き込まれの限界は第１図に示
すごとく浸漬ノズルの深さとメニスカス近傍における溶
鋼の回転流速により決まる。In order to ensure the thickness of the molten powder layer near the mold, it is necessary to prevent the molten powder from being drawn into the vicinity of the immersion nozzle. The limit of this drawing is determined by the depth of the submerged nozzle and the rotational flow velocity of the molten steel near the meniscus, as shown in FIG.
一方、浸漬ノズルの深さが深くなると、第２図に示すご
とくメニスカスでの温度が下がり、パウダーを完全に融
解するには熱不足となり、パウダー滓化不良によるモー
ルド−凝固シェル間の潤滑不良が起る。この潤滑不良は
、モールド内での鋳片拘束をもたらしブレークアウトの
危険性を生ずる原因となる。その他、メニスカスのモー
ルド近傍の溶融パウダ一層厚を確保するためには、パウ
ダーの融点の低下、粘性の増大が必要である。On the other hand, as the depth of the immersion nozzle increases, the temperature at the meniscus decreases as shown in Figure 2, and there is insufficient heat to completely melt the powder, resulting in poor lubrication between the mold and solidified shell due to poor powder slag formation. It happens. This poor lubrication causes the slab to become restricted within the mold, creating a risk of breakout. In addition, in order to ensure a greater thickness of the molten powder near the meniscus mold, it is necessary to lower the melting point of the powder and increase its viscosity.
以上のことより、鋳片表面欠陥の抑制とモールド内拘束
を防止するためには、浸漬ノズル深さを制御することが
必要であり、その浸漬ノズル深さは電磁撹拌力、鋳込速
度およびパウダー物性により最適深さが決定されること
がわかる。すなわち、電磁撹拌力、鋳込速度およびパウ
ダー物性に基づいて浸漬ノズル深さを制御することによ
り、パウダー起因の鋳片表面欠陥およびパウダー潤滑不
良によるモールドへの凝固シェルの焼付きを防止できる
。From the above, it is necessary to control the depth of the immersion nozzle in order to suppress surface defects of the slab and prevent it from being trapped in the mold. It can be seen that the optimum depth is determined by physical properties. That is, by controlling the depth of the immersion nozzle based on the electromagnetic stirring force, casting speed, and powder physical properties, it is possible to prevent powder-induced slab surface defects and seizure of the solidified shell to the mold due to poor powder lubrication.
第３図はこの発明者が実機を使って求めた最適浸漬ノズ
ル深さを例示したものである。図中、実線は低活性、低
融点パウダーを、破線は高粘性。FIG. 3 illustrates the optimal immersion nozzle depth determined by the inventor using an actual machine. In the figure, the solid line indicates low activity, low melting point powder, and the dashed line indicates high viscosity.
高融点のパウダーをそれぞれ使用した場合である。This is the case when powders with high melting points are used.
なお、いずれも電！ｉ撹拌力回転流速６０Ｃｍ／ＳｅＣ
（鋳込速度２．０ｍ／ｍｉｎ時）で撹拌した場合である
。従って、丸鋳片を連続鋳造する場合は、あらかじめ鋳
片サイズ毎に第３図に示すごとき最適浸漬ノズル深さを
求めておくことにより、製造する鋳片サイズに応じて最
適浸漬ノズル深さを設定することができる。In addition, both are electric! i Stirring power Rotational flow rate 60Cm/SeC
(When stirring at a casting speed of 2.0 m/min). Therefore, when continuously casting round slabs, by determining the optimum immersion nozzle depth for each slab size in advance as shown in Figure 3, the optimum immersion nozzle depth can be determined according to the size of the slab to be produced. Can be set.
実 施 例
２３１１ＭＩφ（Ｓ４５Ｃ）丸鋳片連続鋳造機にこの発
明方法を適用した場合の表面欠陥指数を、本発明実施前
（従来）と実施時（本発明例）に分けて、それぞれ第４
図に示す。本実施例における操業条件は第１表に示す。Example 2 The surface defect index when the method of this invention is applied to a 311MIφ (S45C) round slab continuous casting machine is divided into the 4th section before implementing the present invention (conventional) and during implementing the present invention (example of the present invention).
As shown in the figure. The operating conditions in this example are shown in Table 1.
第４図より明らかなごとく、本発明法の実施により、高
速鋳造においても表面欠陥の少ない丸鋳片を製造するこ
とができた。As is clear from FIG. 4, by implementing the method of the present invention, it was possible to produce a round slab with fewer surface defects even during high-speed casting.
以下余白
第１表
発明の詳細
な説明したごとく、この発明方法によれば、丸鋳片の連
続鋳造において溶融パウダーの厚み制御を適正に行ない
、モールド近傍でのパウダー溶融層厚を確保することが
できるので、パウダー起因の鋳片表面欠陥の抑制と鋳片
のモールド内拘束の防止が可能となり、実施例からも明
らかなごとく高速鋳造においても高品質の丸鋳片を製造
することができるという優れた効果を秦するものである
。As described in detail in Table 1 below, according to the method of the invention, the thickness of the molten powder can be properly controlled in continuous casting of round slabs, and the thickness of the molten powder layer near the mold can be ensured. This makes it possible to suppress defects on the surface of the slab caused by powder and prevent the slab from being restricted in the mold.As is clear from the examples, this is an advantage in that high-quality round slabs can be manufactured even during high-speed casting. This is to reduce the effect of the war.
第１図は丸鋳片連続鋳造における浸漬ノズル深さとメニ
スカス近傍における溶鋼の回転流速の関係を示す図、第
２図は浸漬ノズル深さとメニスカス部の高温部割合の関
係を示す図、第３図はこの発明方法による最適浸漬ノズ
ル深さ例を示す図、第４図はこの発明の実施例における
浸漬ノズル深さと表面欠陥指数の関係を示す図で、従来
例と本発明例をそれぞれ示す。
第１図
第２図
浸漬ノズル深さくＪＥＢ）
第３図
鋳込温度（”／ｍ ｉｎ ）
第４図
浸漬ノズル深さく１１１３）Figure 1 is a diagram showing the relationship between the immersion nozzle depth and the rotational flow velocity of molten steel near the meniscus in continuous casting of round slabs, Figure 2 is a diagram showing the relationship between the immersion nozzle depth and the high temperature portion ratio of the meniscus, and Figure 3 4 is a diagram showing an example of the optimum submerged nozzle depth according to the method of the present invention, and FIG. 4 is a diagram showing the relationship between the submerged nozzle depth and the surface defect index in an embodiment of the present invention, showing a conventional example and an example of the present invention, respectively. Figure 1 Figure 2 Immersion nozzle depth JEB) Figure 3 Casting temperature (''/min) Figure 4 Immersion nozzle depth 1113)
Claims (1)
キャスティングを行なう丸鋳片の連続鋳造方法において
、電磁撹拌力、鋳込速度、パウダー物性（粘性、融点）
に基づいて浸漬ノズル深さを制御することを特徴とする
丸鋳片連続鋳造方法。In the continuous casting method of round slabs, which performs powder casting while electromagnetic stirring using a single-hole straight nozzle, electromagnetic stirring force, casting speed, powder physical properties (viscosity, melting point)
A method for continuous casting of round slabs, characterized by controlling the depth of the immersion nozzle based on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62021528A JPH0763818B2 (en) | 1987-01-30 | 1987-01-30 | Round cast continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62021528A JPH0763818B2 (en) | 1987-01-30 | 1987-01-30 | Round cast continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63188459A true JPS63188459A (en) | 1988-08-04 |
| JPH0763818B2 JPH0763818B2 (en) | 1995-07-12 |
Family
ID=12057455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62021528A Expired - Lifetime JPH0763818B2 (en) | 1987-01-30 | 1987-01-30 | Round cast continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0763818B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02284749A (en) * | 1989-04-24 | 1990-11-22 | Sumitomo Metal Ind Ltd | Method for continuously casting steel |
| JP2001025848A (en) * | 1999-07-16 | 2001-01-30 | Sumitomo Metal Ind Ltd | Method for continuously casting round cast billet |
| CN114653912A (en) * | 2022-02-14 | 2022-06-24 | 江阴兴澄特种钢铁有限公司 | Method for producing large-diameter high-purity compact special steel continuous casting round billet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226318A (en) * | 1975-08-25 | 1977-02-26 | Kawasaki Steel Co | Manufacture of continuous casting steels with excellent surface |
| JPS57209762A (en) * | 1981-06-17 | 1982-12-23 | Nippon Steel Corp | Production of continuously cast ingot |
| JPS6152969A (en) * | 1984-08-22 | 1986-03-15 | Nippon Kokan Kk <Nkk> | Electromagnetic stirrer for continuous casting molten steel |
-
1987
- 1987-01-30 JP JP62021528A patent/JPH0763818B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226318A (en) * | 1975-08-25 | 1977-02-26 | Kawasaki Steel Co | Manufacture of continuous casting steels with excellent surface |
| JPS57209762A (en) * | 1981-06-17 | 1982-12-23 | Nippon Steel Corp | Production of continuously cast ingot |
| JPS6152969A (en) * | 1984-08-22 | 1986-03-15 | Nippon Kokan Kk <Nkk> | Electromagnetic stirrer for continuous casting molten steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02284749A (en) * | 1989-04-24 | 1990-11-22 | Sumitomo Metal Ind Ltd | Method for continuously casting steel |
| JP2001025848A (en) * | 1999-07-16 | 2001-01-30 | Sumitomo Metal Ind Ltd | Method for continuously casting round cast billet |
| CN114653912A (en) * | 2022-02-14 | 2022-06-24 | 江阴兴澄特种钢铁有限公司 | Method for producing large-diameter high-purity compact special steel continuous casting round billet |
| CN114653912B (en) * | 2022-02-14 | 2024-05-17 | 江阴兴澄特种钢铁有限公司 | Production method of large-diameter high-purity compact special steel continuous casting round billet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0763818B2 (en) | 1995-07-12 |
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