JPH05277681A - Continuous casting method - Google Patents
Continuous casting methodInfo
- Publication number
- JPH05277681A JPH05277681A JP7702892A JP7702892A JPH05277681A JP H05277681 A JPH05277681 A JP H05277681A JP 7702892 A JP7702892 A JP 7702892A JP 7702892 A JP7702892 A JP 7702892A JP H05277681 A JPH05277681 A JP H05277681A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- continuous casting
- viscosity
- casting
- solidification temperature
- 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
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- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、連続鋳造方法、特に連
続鋳造に用いるパウダーの凝固温度および粘度と目標最
大鋳造速度との関係においてその一つを決定する方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting method, and more particularly to a method for determining one of them in the relationship between the solidification temperature and viscosity of powder used in continuous casting and the target maximum casting speed.
【０００２】[0002]
【従来の技術】一般に、連続鋳造において、使用するパ
ウダー（フラックス）の凝固温度および粘度がスラブの
割れ防止とブレークアウトの防止の上から重要な因子で
あることは知られている。2. Description of the Related Art Generally, in continuous casting, it is known that the solidification temperature and viscosity of the powder (flux) used are important factors in preventing slab cracking and breakout.
【０００３】先ず、連続鋳造用パウダーの凝固温度は鋳
型内におけるスラブの冷却状態に大きな影響を有し、パ
ウダー凝固温度が高くなるほどスラブは緩冷却され、ス
ラブの割れ防止に効果的である（図１参照）。しかし、
パウダー凝固温度を上げると高温でもパウダーが再凝固
しやすくなるため、図３に示すように、鋳型１の内周壁
上に形成される再凝固パウダー層２の厚みが増大し、そ
の結果、鋳型１とシエル３との間の溶融パウダー４の流
入路５が狭くなり、溶融パウダー４の流入量が減少し、
高速鋳造時においては溶融パウダーの流入量不足、すな
わち、パウダー消費量不足によるスティッキング性のブ
レークアウトが発生するという問題があった（図４参
照）。First, the solidification temperature of the powder for continuous casting has a great influence on the cooling state of the slab in the mold, and the higher the powder solidification temperature, the slower the slab is cooled, which is effective in preventing cracking of the slab (Fig. 1). But,
As the powder coagulation temperature is increased, the powder easily re-coagulates even at a high temperature. Therefore, as shown in FIG. 3, the thickness of the re-coagulated powder layer 2 formed on the inner peripheral wall of the mold 1 increases, and as a result, the mold 1 And the inflow path 5 of the molten powder 4 between the shell 3 and the shell 3 is narrowed, the inflow amount of the molten powder 4 is reduced,
At the time of high speed casting, there is a problem that the inflow amount of the molten powder is insufficient, that is, the sticking out breakout occurs due to the insufficient powder consumption amount (see FIG. 4).
【０００４】また、パウダーの粘度も、鋳型１とシエル
３との間への溶融パウダー４の流入性に影響を有し、パ
ウダーの粘性が高い程、パウダーの流入量が減少して流
入量不足によるスティッキング性のブレークアウトが発
生しやすかった。しかし、使用するパウダーの粘性が低
すぎると図５に示すように、浸漬ノズル８からの溶鋼流
９によってスラブ６の表面に10で示すようにパウダーが
巻き込まれる等の問題が生じる。The viscosity of the powder also affects the inflow property of the molten powder 4 between the mold 1 and the shell 3. The higher the viscosity of the powder, the smaller the inflow amount of the powder, and the insufficient inflow amount. It was easy for breakout due to sticking to occur. However, when the viscosity of the powder used is too low, as shown in FIG. 5, the molten steel flow 9 from the dipping nozzle 8 causes a problem that the powder is caught on the surface of the slab 6 as indicated by 10.
【０００５】従来のパウダー設計技術では、図６に示す
ように、パウダー凝固温度が一定の場合には、鋳型との
摩擦力よりパウダーの粘度η×鋳造速度Ｖとパウダー消
費量Ｑとの間には逆比例の関係が成り立つことが知られ
ている。この関係から、従来は、パウダーの凝固温度が
一定の下では、パウダー粘性と使用可能最大鋳造速度Ｖ
max を計算することが可能であった。In the conventional powder design technique, as shown in FIG. 6, when the powder coagulation temperature is constant, the powder viscosity η × the casting speed V and the powder consumption amount Q are determined by the frictional force with the mold. Is known to have an inversely proportional relationship. From this relationship, conventionally, when the solidification temperature of the powder is constant, the powder viscosity and the maximum usable casting speed V
It was possible to calculate max.
【０００６】しかしながら、パウダーの凝固温度が変っ
た場合には、パウダー粘度を設定し、実際の連鋳機にお
いて試験を行なうことによって消費量を求め、所定のパ
ウダー流入量を確保できる使用可能最大鋳造速度を決定
しなければならなかった。However, when the solidification temperature of the powder changes, the powder viscosity is set, the consumption is obtained by conducting a test in an actual continuous casting machine, and the maximum usable casting in which a predetermined powder inflow amount can be secured. I had to determine the speed.
【０００７】したがって、従来技術では、スラブの品質
を向上させるために凝固温度および粘度を変えたパウダ
ーを作製して、実際の連鋳機による試験時に、パウダー
の最低流入量0.3kg/m2が確保できないために目標鋳造速
度で使用できない場合が生じていた。Therefore, in the prior art, powder having different solidification temperatures and viscosities was produced in order to improve the quality of the slab, and the minimum inflow rate of the powder was 0.3 kg / m 2 when tested by an actual continuous casting machine. In some cases, it could not be used at the target casting speed because it could not be secured.
【０００８】上述したように、パウダーを改良した場合
には、そのパウダーを実際の連鋳機で試験的に使用して
パウダーの物性値（粘性、凝固温度）を再設計しなくて
はならず、パウダー設計の能率が悪く、また、未知のパ
ウダーの使用に際して、設計ミスによるブレークアウト
の危険性が高いという問題があった。As described above, when the powder is improved, the powder must be experimentally used in an actual continuous casting machine to redesign the physical properties (viscosity, solidification temperature) of the powder. However, there was a problem that the powder design was inefficient, and there was a high risk of breakout due to a design mistake when using an unknown powder.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、上述した従
来のパウダー設計上の問題をなくし、連続鋳造用パウダ
ーの凝固温度および粘度と目標最大速度との間の関係を
数値的に確立することによって、高品質のスラブを、ブ
レークアウトの発生なしに、容易に製造することを可能
にする連続鋳造方法を提供しようとするものである。SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned conventional powder design problems and numerically establishes the relationship between the solidification temperature and viscosity of continuous casting powder and the target maximum velocity. Therefore, it is intended to provide a continuous casting method that enables high quality slabs to be easily manufactured without occurrence of breakout.
【００１０】[0010]
【課題を解決するための手段】本発明は、連続鋳造に際
し、連続鋳造用パウダーの凝固温度および粘度と、目標
最大鋳造速度の何れか一つを次式により決定することを
特徴とする。 Ｔ＝Ａ×η（Ｖ±0.1)＋Ｂ 上式において、 Ｔ：連続鋳造用パウダーの凝固温度（℃） η：連続鋳造用パウダーの粘度（poise) Ｖ：目標最大鋳造速度（m/min) Ａ：定数 Ｂ：定数The present invention is characterized in that, in continuous casting, any one of the solidification temperature and viscosity of the powder for continuous casting and the target maximum casting speed is determined by the following equation. T = A × η (V ± 0.1) + B In the above formula, T: solidification temperature of continuous casting powder (° C) η: viscosity of continuous casting powder (poise) V: target maximum casting speed (m / min) A : Constant B: constant
【００１１】[0011]
【作用】本発明は、パウダーの凝固温度が変化した場
合、溶融パウダーの流入路の断面積、したがって流入量
が変化することによって、パウダー粘度η×鋳造速度Ｖ
の逆数１／ηＶとパウダー消費量（kg/m2)との関係が図
７に示すように変化する事実の認識に基づくものであ
る。According to the present invention, when the solidification temperature of the powder changes, the cross-sectional area of the inflow path of the molten powder, and thus the inflow rate, changes, so that the powder viscosity η × the casting speed V
This is based on the recognition of the fact that the relationship between the reciprocal 1 / ηV and the powder consumption (kg / m 2 ) changes as shown in FIG.
【００１２】これがため本発明は、上述の認識に基づ
き、パウダーの凝固温度および粘度と、パウダー消費量
とを求め、充分なパウダー消費量を確保するためのパウ
ダー凝固温度Ｔ、粘度η、使用可能最大鋳造速度Ｖmax
との間に操業条件のばらつきを考慮して Ｔ＝Ａ×η（Ｖmax ±0.1)＋Ｂ の関係があることを確かめたものである。Therefore, according to the present invention, based on the above recognition, the solidification temperature and viscosity of the powder and the powder consumption amount are obtained, and the powder solidification temperature T, the viscosity η, and the usable value for ensuring the sufficient powder consumption amount can be used. Maximum casting speed Vmax
It has been confirmed that there is a relation of T = A × η (Vmax ± 0.1) + B between and and in consideration of variations in operating conditions.
【００１３】なお、式中のＡ，Ｂは鋳型の形状、材質、
操業条件等によって決まる連続機固有の定数である。ま
た、式中の数値0.1 は操業条件のばらつき、すなわち、
モールドレベル変動、鋳造内パウダー溶融層の厚さ変化
等によるパウダーの流入状態のばらつきを考慮したもの
である。A and B in the formula are the shape and material of the mold,
It is a constant that is unique to continuous machines and is determined by operating conditions. Also, the numerical value 0.1 in the formula is the variation in operating conditions, that is,
This is due to consideration of variations in the powder inflow state due to changes in the mold level, changes in the thickness of the powder melting layer in casting, and so on.
【００１４】本発明によれば、スラブの割れを防止する
ため、パウダーの凝固温度Ｔを所定値に設定すれば、目
標鋳造速度を与えることによって最適粘度を求めること
ができる。According to the present invention, in order to prevent cracking of the slab, if the solidification temperature T of the powder is set to a predetermined value, the optimum viscosity can be obtained by giving the target casting speed.
【００１５】また、本発明によれば、パウダーの巻き込
みを防止するため、パウダーの粘度ηを所定値に設定し
て、目標鋳造速度を与えることによって、最適パウダー
凝固温度を求めることができる。Further, according to the present invention, in order to prevent the entrainment of powder, the optimum powder solidification temperature can be obtained by setting the viscosity η of the powder to a predetermined value and giving the target casting speed.
【００１６】さらに、本発明によれば、新しい連続鋳造
用パウダーが開発された場合、そのパウダー凝固温度お
よび粘度を知ることによって、実際の連鋳機による試験
を行なうことなく、使用可能最大鋳造速度を計算により
求めることができ、新パウダー使用時のブレークアウト
の危険性を減少させることができる。Furthermore, according to the present invention, when a new continuous casting powder is developed, the maximum casting speed that can be used without knowing the powder coagulation temperature and viscosity without actually conducting a continuous casting test. Can be calculated to reduce the risk of breakout when using the new powder.
【００１７】[0017]
【実施例】図８は本発明によりパウダーの凝固温度Ｔお
よび粘度ηと使用可能最大鋳造速度Ｖmax を決定するた
めに用いられるグラフであり、はＴ＝Ａ×ηＶ＋Ｂ、
はＴ＝Ａ×η（Ｖ＋0.1)＋Ｂ、 はＴ＝Ａ＋η（Ｖ
−0.1)＋Ｂ の関係を示す。EXAMPLE FIG. 8 is a graph used to determine the freezing temperature T and viscosity η of powder and the maximum usable casting speed Vmax according to the present invention, where T = A × ηV + B,
Is T = A × η (V + 0.1) + B, is T = A + η (V
It shows the relationship of -0.1) + B.
【００１８】図８を用いることにより、例えば、ｂパウ
ダーを通常操業に使用していた場合に、スラブ割れ対策
として凝固温度をｘ(1100 ℃) からｙに上げるには、η
・Ｖmax をＸからＹに変更すれば良いことが判る。この
場合、Ｖmax を変更しないとすれば、η′＝Ｙ／Ｖmax
で求められる。By using FIG. 8, for example, when the b powder was used in the normal operation, to increase the solidification temperature from x (1100 ° C.) to y as a countermeasure against slab cracking, η
・ It turns out that it is sufficient to change Vmax from X to Y. In this case, if Vmax is not changed, η '= Y / Vmax
Required by.
【００１９】[0019]
【発明の効果】本発明によれば、前述した目標鋳造速度
に対するパウダーの凝固温度および粘度の設定または新
しいパウダーに対する使用可能最大鋳造速度の設定が、
実際の連鋳機による試験を行なうことなしに、容易に可
能であり、高品質のスラブをブレークアウトの発生なし
に製造することが容易である。According to the present invention, the setting of the solidification temperature and viscosity of the powder with respect to the above-mentioned target casting speed or the setting of the maximum usable casting speed for the new powder is
This is easily possible without the actual continuous caster testing, and it is easy to produce high quality slabs without breakouts.
【図１】連続鋳造用パウダーの凝固温度の違いによる鋳
造速度と鋳型抜熱量の関係を示すグラフである。FIG. 1 is a graph showing a relationship between a casting speed and a heat removal amount of a mold depending on a difference in solidification temperature of powder for continuous casting.
【図２】使用パウダーの凝固温度が適正である場合のパ
ウダー流入量を示す鋳型上部の線図的部分縦断面図であ
る。FIG. 2 is a diagrammatic partial vertical cross-sectional view of the upper part of the mold showing the powder inflow amount when the solidification temperature of the powder used is appropriate.
【図３】使用パウダーの凝固温度が図２の場合より、高
い場合のパウダー流入量を示す鋳型上部の線図的部分縦
断面図である。3 is a diagrammatic partial vertical cross-sectional view of the upper part of the mold showing the powder inflow when the solidification temperature of the powder used is higher than in the case of FIG.
【図４】パウダー流入量とブレークアウトとの関係を示
すグラフである。FIG. 4 is a graph showing the relationship between powder inflow and breakout.
【図５】使用パウダーの粘度が低い場合における溶融パ
ウダーの巻き込みを示す鋳型上部の線図的部分縦断面図
である。FIG. 5 is a diagrammatic partial vertical cross-sectional view of the upper part of the mold showing the entrainment of molten powder when the viscosity of the powder used is low.
【図６】パウダー粘度・鋳造速度とパウダー消費量との
関係を示すグラフである。FIG. 6 is a graph showing the relationship between powder viscosity / casting speed and powder consumption.
【図７】パウダー消費量に及ぼすパウダー凝固温度の変
化の影響を示すグラフである。FIG. 7 is a graph showing the effect of changes in powder coagulation temperature on powder consumption.
【図８】本発明によるパウダー凝固温度とパウダー粘度
・使用可能最大鋳造速度との関係を示すグラフである。FIG. 8 is a graph showing the relationship between powder coagulation temperature, powder viscosity and maximum usable casting speed according to the present invention.
１ 鋳型 ２ パウダー再凝固層 ３ シエル ４ 溶融パウダー ５ 溶融パウダー流入路 ６ 溶鋼 ７ 未溶融パウダー ８ 浸漬ノズル ９ 溶鋼流 10 巻き込まれた溶融パウダー 1 mold 2 powder re-solidification layer 3 shell 4 molten powder 5 molten powder inflow path 6 molten steel 7 unmelted powder 8 immersion nozzle 9 molten steel flow 10 molten powder entrained
Claims (1)
凝固温度および粘度と、目標最大鋳造速度の何れか一つ
を次式により決定することを特徴とする連続鋳造方法。 Ｔ＝Ａ×η（Ｖ±0.1)＋Ｂ 上式において、 Ｔ：連続鋳造用パウダーの凝固温度（℃） η：連続鋳造用パウダーの粘度（poise) Ｖ：目標最大鋳造速度（m/min) Ａ：定数 Ｂ：定数1. A continuous casting method, characterized in that during continuous casting, one of a solidification temperature and a viscosity of powder for continuous casting and a target maximum casting speed is determined by the following equation. T = A × η (V ± 0.1) + B In the above formula, T: solidification temperature of continuous casting powder (° C) η: viscosity of continuous casting powder (poise) V: target maximum casting speed (m / min) A : Constant B: constant
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04077028A JP3101069B2 (en) | 1992-03-31 | 1992-03-31 | Continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04077028A JP3101069B2 (en) | 1992-03-31 | 1992-03-31 | Continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05277681A true JPH05277681A (en) | 1993-10-26 |
| JP3101069B2 JP3101069B2 (en) | 2000-10-23 |
Family
ID=13622296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04077028A Expired - Fee Related JP3101069B2 (en) | 1992-03-31 | 1992-03-31 | Continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3101069B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008200721A (en) * | 2007-02-21 | 2008-09-04 | Jfe Steel Kk | Mold flux for continuous casting of steel, and continuous casting method using the mold flux |
| JP2012206160A (en) * | 2011-03-30 | 2012-10-25 | Nippon Steel Corp | Continuous casting method |
| JP2016168608A (en) * | 2015-03-12 | 2016-09-23 | Ｊｆｅスチール株式会社 | Friction force estimation method for casting mold and casting piece when continuously casting steel and steel continuous casting method using the same |
-
1992
- 1992-03-31 JP JP04077028A patent/JP3101069B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008200721A (en) * | 2007-02-21 | 2008-09-04 | Jfe Steel Kk | Mold flux for continuous casting of steel, and continuous casting method using the mold flux |
| JP2012206160A (en) * | 2011-03-30 | 2012-10-25 | Nippon Steel Corp | Continuous casting method |
| JP2016168608A (en) * | 2015-03-12 | 2016-09-23 | Ｊｆｅスチール株式会社 | Friction force estimation method for casting mold and casting piece when continuously casting steel and steel continuous casting method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3101069B2 (en) | 2000-10-23 |
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