JPH09308949A - Method for continuously casting steel - Google Patents
Method for continuously casting steelInfo
- Publication number
- JPH09308949A JPH09308949A JP12744496A JP12744496A JPH09308949A JP H09308949 A JPH09308949 A JP H09308949A JP 12744496 A JP12744496 A JP 12744496A JP 12744496 A JP12744496 A JP 12744496A JP H09308949 A JPH09308949 A JP H09308949A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- liquid lubricant
- lubricant
- mold powder
- powder
- 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
Landscapes
- Continuous Casting (AREA)
- Lubricants (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は鋼の連続鋳造方法に
関し、特にダミーバースタート時又はタンディッシュ交
換後の鋳込み開始時の増速時に、鋳型と鋳片との間を潤
滑する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting method for steel, and more particularly to a method for lubricating a space between a mold and a slab at the time of increasing a speed at the start of casting after starting a dummy bar or after replacing a tundish.
【０００２】[0002]
【従来の技術】従来、一般に連続鋳造法により鋼を鋳造
する場合、鋳型と鋳片間の潤滑は鋳型内溶鋼浴面上にモ
ールドパウダまたはレプシードオイルなどの潤滑剤を供
給し、かつ鋳型にオシレーション運動を与えることによ
ってなされている。特にスラブ連鋳においてはモールド
パウダを用いることが多い。モールドパウダは鋼浴面上
に投入され、溶鋼に近づくにつれ粉末状態から焼結状
態、溶融状態へとその態様が変化し、溶融モールドパウ
ダが鋳型と鋳片凝固シェルとの間に流入して潤滑剤とし
て作用する。この溶融モールドパウダの流入は、重力お
よび鋳型のオシレーションによるもので、その流入量は
溶融モールドパウダの物性や溶融モールドパウダ層の厚
み、鋳型のオシレーション条件、鋳片の引き抜き速度等
によって決定される。例えばモールドパウダの消費量は
鋳造速度の増加に伴い減少し、高速鋳造においては、モ
ールドパウダの流入不良が発生しやすく、鋳型と鋳片凝
固シェルの焼き付きによるブレークアウトの原因とな
る。2. Description of the Related Art Conventionally, when casting steel generally by a continuous casting method, lubrication between a mold and a slab is performed by supplying a lubricant such as mold powder or repseed oil onto the molten steel bath surface in the mold and It is done by giving an oscillation exercise. Especially in slab continuous casting, a mold powder is often used. The mold powder is put on the surface of the steel bath and its state changes from powder state to sintering state and molten state as it approaches molten steel, and the molten mold powder flows between the mold and the solidified shell of the slab for lubrication. Acts as an agent. The inflow of the molten mold powder is due to gravity and the oscillation of the mold, and the inflow amount is determined by the physical properties of the molten mold powder, the thickness of the molten mold powder layer, the oscillation conditions of the mold, the withdrawal speed of the slab, etc. It For example, the consumption of the mold powder decreases as the casting speed increases, and in the high-speed casting, defective inflow of the mold powder is likely to occur, which causes breakout due to seizure of the mold and the slab solidifying shell.
【０００３】この問題を解決するために、流動性が良好
な低粘性または低融点のモールドパウダを用いたり、特
開昭５９−１５３５５７号公報に記載されているよう
な、モールドパウダとなたね油とを併用する方法が提案
されている。さらになたね油中にモールドパウダを事前
に懸濁させたスラリを添加する方法（特公平６−２０６
１７号公報）も提案されている。In order to solve this problem, a mold powder having a low viscosity or a low melting point having good fluidity is used, or a mold powder and seed oil as described in JP-A-59-153557 are used. A method of using them together has been proposed. Further, a method of adding a slurry prepared by previously suspending mold powder in rapeseed oil (Japanese Patent Publication No. 6-206
No. 17 publication) is also proposed.
【０００４】さらに、潤滑剤の鋳型と鋳片凝固シェル間
への流入不良を補うため、鋼浴面より下の鋳型から直接
オイルなどの潤滑剤を供給する方法（特開昭６０−２２
１１５６号公報、特開昭６１−４９７７５６号公報、特
開昭６１−５２９６４号公報、特公平８−４８８０号公
報等）が提案されている。また鋳込み開始時にはモール
ドパウダの溶融が追いつかないため特に流入不足が発生
しやすく、素早い増速を阻害している。この問題を解決
するためにこの時期だけ溶融速度の大きいフロントパウ
ダを用いる方法が一般に行われている。Further, in order to compensate for the poor flow of the lubricant between the mold and the slab solidifying shell, a method of directly supplying a lubricant such as oil from the mold below the steel bath surface (JP-A-60-22).
1156, JP 61-497756, JP 61-52964, and JP-B-8-4880). In addition, since the melting of the mold powder cannot catch up at the start of casting, insufficient inflow is likely to occur, which impedes quick speedup. In order to solve this problem, a method using a front powder having a large melting rate only at this time is generally used.
【０００５】[0005]
【発明が解決しようとする課題】モールドパウダとなた
ね油とを併用する方法では、特に定常鋳込み状態では、
粉末状のモールドパウダの上からなたね油を注入するの
で、既に粉末状態から焼結状態となったモールドパウダ
内になたね油が流入しにくく、その結果鋳型と鋳片との
間までなたね油が到達しないうちに分解、燃焼してしま
うという欠点があった。また鋳型鋼板の細管を通して鋼
浴面下からオイルを供給する方法は穴がつまりやすく効
果が不安定であった。In the method of using mold powder and rapeseed oil in combination, particularly in the steady casting state,
Since the rapeseed oil is injected from above the powdery mold powder, it is difficult for the rapeseed oil to flow into the mold powder that has already been in the powder state and has been sintered, and as a result, the rapeseed oil does not reach between the mold and the slab. It had the drawback of breaking down and burning. Also, the method of supplying oil from below the surface of the steel bath through the thin tube of the mold steel sheet was apt to clog holes and the effect was unstable.
【０００６】さらに最近では低粘性または低融点を有す
るモールドパウダを用いることにより４〜５ｍ／ｍｉｎ
レベルまでの高速鋳造が可能となり、あえてオイル中に
モールドパウダを懸濁させたスラリを用いる必要性もな
くなりつつある。しかしながら鋳込開始時の増速時にお
いては低粘性、低融点モールドパウダやフロントモール
ドパウダでは未だ十分な潤滑が得られず特に拘束性ブレ
ークアウトが発生しやすく、素早い増速の阻げとなって
いる。More recently, by using a mold powder having a low viscosity or a low melting point, 4-5 m / min has been obtained.
High-speed casting down to the level has become possible, and the need to use a slurry in which mold powder is suspended in oil is becoming obsolete. However, low viscosity, low melting point mold powders and front mold powders still do not provide sufficient lubrication at the time of increasing the speed at the start of casting, and a restrictive breakout is likely to occur, which prevents quick acceleration. There is.
【０００７】[0007]
【課題を解決するための手段】本発明は特に鋳込開始
（ダミーバースタート、タンディッシュ交換後のスター
ト）時の潤滑不良に起因するブレークアウトを防止し
て、素早い増速を達成するものである。すなわち、ダミ
ーバースタート時もしくはタンディッシュ交換後のスタ
ート時の増速率が１ｍ／ｍｉｎ2 以上の時期に鋳型と鋳
片の間の潤滑剤として連鋳用モールドパウダと植物油、
鉱物油、脂肪酸エステルまたはこれらの混合物またはこ
れらに固体潤滑剤を混合した液体潤滑剤を同時に供給す
ることにより、モールドパウダの流入不良による潤滑不
良を液体潤滑剤により補うことができ、ブレークアウト
を防止することができる。The present invention is intended to prevent breakout due to poor lubrication particularly at the start of casting (dummy bar start, start after tundish replacement), and achieve quick acceleration. . That is, the mold powder for continuous casting and vegetable oil as a lubricant between the mold and the slab at the time when the acceleration rate at the time of starting the dummy bar or after starting the tundish exchange is 1 m / min 2 or more,
By simultaneously supplying mineral oil, fatty acid ester, a mixture of these or a liquid lubricant in which a solid lubricant is mixed, it is possible to compensate for poor lubrication due to poor inflow of the mold powder with the liquid lubricant and prevent breakout. can do.
【０００８】増速率が１ｍ／ｍｉｎ2 以上の時期に限定
したのは、次の理由による。図２に鋳込開始時のスター
トから鋳造速度が１ｍ／ｍｉｎになるまでの平均増速率
とモールドパウダ消費量の関係を示す。図２より、特に
鋳込開始時の増速率が１．０ｍ／ｍｉｎ2 以上ではモー
ルドパウダの消費量が減少しており、潤滑不良になるこ
とが判明した。従ってこの領域で液体潤滑剤を同時に加
えることによって潤滑不良を解消する本発明法が特に有
効である。The reason why the speed increasing rate is limited to the period of 1 m / min 2 or more is as follows. FIG. 2 shows the relationship between the average speedup rate from the start of casting until the casting speed reaches 1 m / min and the amount of mold powder consumed. From FIG. 2, it has been found that the consumption of the mold powder is reduced and the lubrication becomes defective especially when the speedup rate at the start of casting is 1.0 m / min 2 or more. Therefore, the method of the present invention which eliminates the poor lubrication by simultaneously adding the liquid lubricant in this region is particularly effective.
【０００９】液体潤滑剤としては、なたね油などの植物
油、鉱物油、脂肪酸エステル又はこれらの混合物とし、
さらにこれらにＭｏＳ2 、Ｍｏ−ＭｏＳ2 、ＰｂＯ、Ｎ
ａ2ＭｏＯ4 、ＷＢ−Ａｇ−Ｎｉ、Ａｇ−ＰＴＦＥ−Ｗ
Ｓｅ2 などの固体潤滑剤を混合してもよい。液体潤滑剤
に固体潤滑剤を混合することにより、モールドパウダ流
入不良時の潤滑不良を、液体潤滑剤とともに流入した固
体潤滑剤がさらに効果的に補うことができるようにな
る。なお、液体潤滑剤も、流入後は高温で炭化し黒鉛
（固体潤滑剤）として作用することとなる。As the liquid lubricant, vegetable oil such as rapeseed oil, mineral oil, fatty acid ester or a mixture thereof,
In addition to these, MoS 2 , Mo-MoS 2 , PbO, N
a 2 MoO 4 , WB-Ag-Ni, Ag-PTFE-W
Solid lubricants, such as Se 2 may be mixed. By mixing the solid lubricant with the liquid lubricant, the solid lubricant that has flowed in together with the liquid lubricant can more effectively compensate for the poor lubrication at the time of poor mold powder inflow. The liquid lubricant also carbonizes at a high temperature after flowing into it and acts as graphite (solid lubricant).
【００１０】[0010]
【発明の実施の形態】本発明によれば、ダミーバースタ
ート時又はタンディッシュ交換スタート時の鋳込開始時
の増速時に、連鋳用モールドパウダと液体潤滑剤を同時
に供給するようにしたから、モールドパウダの焼結層が
発達する前に、なたね油などの液体潤滑剤が鋳型と鋳片
凝固シェルとの間に流入し、たとえモールドパウダがそ
の溶融速度が追いつかず流入不良になったとしても、な
たね油による潤滑が十分であるのでブレークアウト等の
発生を防止することができるようになる。その結果増速
率を大きくすることも可能となる。従来、モールドパウ
ダとなたね油を定常状態で併用する方法が提案されてい
たが、定常状態ではモールドパウダの焼結層によりオイ
ルが鋳型と鋳片凝固シェルとの間に流入することが妨げ
られ、必ずしもその効果が得られていなかった。According to the present invention, the mold powder for continuous casting and the liquid lubricant are simultaneously supplied at the time of increasing the speed at the start of casting at the time of starting the dummy bar or starting the tundish exchange. Before the sintered layer of the mold powder develops, liquid lubricant such as rapeseed oil flows in between the mold and the slab solidifying shell, and even if the mold powder fails to catch up with its melting rate and becomes inflow failure, Since the rapeseed oil is sufficiently lubricated, it is possible to prevent the occurrence of breakout and the like. As a result, it is possible to increase the speed increasing rate. Conventionally, a method of using mold powder and rapeseed oil in a steady state has been proposed, but in the steady state, the oil is prevented from flowing between the mold and the slab by the sintered layer of the mold powder, which is not always necessary. The effect was not obtained.
【００１１】図１は本発明方法を実施する例を示す鋳型
の断面図である。鋳型１内において、溶鋼３は鋳片凝固
シェル２を形成している。溶鋼２上に供給された粉末状
のモールドパウダ４ａは、下降するにつれて焼結状態の
モールドパウダ４ｂとなり、さらに下降して溶融状態の
モールドパウダ４ｃとなり、鋳型１と凝固シェル２との
間の隙間に侵入する。しかし、ダミーバースタート時又
はタンディッシュ交換スタート後の鋳込開始時の増速時
には、モールドパウダが未だ溶融状態に到達していな
い。そこで本発明では、図１に示すように、液体潤滑剤
注入管５を備え、鋳型内面の鋼浴面より上方から液状潤
滑剤を滴下する。鋳込開始の少し前から液状潤滑剤の滴
下を開始し、増速中にモールドパウダを併せて供給す
る。すなわち、増速中はモールドパウダと液体潤滑剤と
を同時に供給する。増速終了後は液体潤滑剤の滴下を中
止してモールドパウダのみで鋳造を行う。FIG. 1 is a sectional view of a mold showing an example for carrying out the method of the present invention. In the mold 1, the molten steel 3 forms the cast solidified shell 2. The powdery mold powder 4a supplied onto the molten steel 2 becomes a mold powder 4b in a sintered state as it descends, and further descends into a mold powder 4c in a molten state, and a gap between the mold 1 and the solidified shell 2 is generated. Break into. However, the mold powder has not yet reached the molten state when the dummy bar is started or when the casting is started after the tundish exchange is started and the speed is increased. Therefore, in the present invention, as shown in FIG. 1, a liquid lubricant injection pipe 5 is provided, and the liquid lubricant is dripped from above the steel bath surface inside the mold. Shortly before the start of pouring, dripping of the liquid lubricant was started, and the mold powder was also supplied during acceleration. That is, during acceleration, the mold powder and the liquid lubricant are simultaneously supplied. After accelerating, dropping of liquid lubricant is stopped and casting is performed only with mold powder.
【００１２】[0012]
【実施例】本発明方法を用い２２０ｍｍｔ×１５００ｍ
ｍＷのスラブを垂直曲げ型連鋳機で鋳造した例について
述べる。低炭素アルミキルド鋼（成分Ｃ／０．０５ｗｔ
％、Ｓｉ／０．０１ｗｔ％、Ｍｎ／０．８ｗｔ％、Ｐ／
０．０１５ｗｔ％、Ｓ／０．００８ｗｔ％、Ａｌ／０．
０４ｗｔ％）を浸漬ノズルから鋳型内に注入する。注入
開始直後になたね油を液体潤滑剤注入管５から合計２０
０ｃｃ／ｍｉｎを鋳型長辺面全体にほぼ均一に給油を開
始する。溶鋼が鋳型内に満たされ浸漬ノズルの吐出孔が
浸漬した時点でモールドパウダ（ＳｉＯ2 ／３５％、Ａ
ｌ2 Ｏ3 ／７．５％、ＣａＯ／３４％、ＭｇＯ／１．５
％、Ｎａ2 Ｏ／４．５％、ＣａＦ2 ／５％）を鋼浴面に
散布し、引き抜きを開始する。引き抜き速度の増速率は
１．２ｍ／ｍｉｎ2 で速度２．４ｍ／ｍｉｎまで一気に
増速する。増速終了後になたね油の給油を停止し、モー
ルドパウダのみで鋳造を続行する。EXAMPLE 220 mmt × 1500 m using the method of the present invention
An example in which an mW slab is cast by a vertical bending type continuous casting machine will be described. Low carbon aluminum killed steel (component C / 0.05wt
%, Si / 0.01 wt%, Mn / 0.8 wt%, P /
0.015 wt%, S / 0.008 wt%, Al / 0.
04 wt%) is injected into the mold from the dipping nozzle. Immediately after the start of injection, a total of 20 seed oils from the liquid lubricant injection pipe 5
Lubrication is started almost uniformly at 0 cc / min over the entire long side surface of the mold. When the molten steel is filled in the mold and the discharge hole of the immersion nozzle is immersed, the mold powder (SiO 2 /35%, A
l 2 O 3 /7.5%, CaO / 34%, MgO / 1.5
%, Na 2 O / 4.5%, CaF 2 /5%) is sprinkled on the steel bath surface, and drawing is started. The rate of increase of the drawing speed is 1.2 m / min 2 and the speed is increased to 2.4 m / min at a stroke. After accelerating, the rapeseed oil supply is stopped and the casting is continued only with the mold powder.
【００１３】次に、鋳込開始時のブレークアウトの発生
率と増速率の関係を、モールドパウダのみで行う従来の
鋳造法と、なたね油とモールドパウダとを併用する本発
明方法について比較を行った。結果を図３に示した。従
来法では，特に平均増速率が１．０ｍ／ｍｉｎ2 を越え
るとブレークアウトの発生率が急増するのに対して、本
発明法では１．０ｍ／ｍｉｎ2 を越えてもほとんどブレ
ークアウトの発生率が変化していない。本発明では平均
増速率が１．０ｍ／ｍｉｎ2 未満でも多少ブレークアウ
トの発生率が低下しているが、特に１．０ｍ／ｍｉｎ2
以上でその効果が大きい。これは従来法でモールドパウ
ダの流入不良による潤滑不良が発生しやすい増速率１．
０ｍ／ｍｉｎ2 以上では、なたね油が潤滑を補っている
ことを示している。Next, the relationship between the breakout occurrence rate at the start of casting and the speedup rate was compared between the conventional casting method in which only mold powder is used and the method of the present invention in which rapeseed oil and mold powder are used in combination. . The results are shown in FIG. In the conventional method, especially when the average speed-up rate exceeds 1.0 m / min 2 , the breakout occurrence rate sharply increases, whereas in the method of the present invention, breakout occurs almost even when the average speedup exceeds 1.0 m / min 2. The rate has not changed. Although the incidence of some breakout average acceleration rate be less than 1.0 m / min 2 in the present invention is impaired, particularly 1.0 m / min 2
With the above, the effect is great. This is because the conventional method is likely to cause poor lubrication due to poor mold powder inflow.
At 0 m / min 2 or more, it indicates that the rapeseed oil supplements the lubrication.
【００１４】また、なたね油のかわりに脂肪酸エステル
を使用した場合、およびなたね油にＰｂＯを混入した場
合の同条件で鋳造したブレイクアウトの発生率の結果を
図３に示す。なたね油と同様の効果が得られている。Further, FIG. 3 shows the results of the breakout occurrence rate cast under the same conditions when a fatty acid ester was used instead of rapeseed oil and when PbO was mixed in rapeseed oil. It has the same effect as rapeseed oil.
【００１５】[0015]
【発明の効果】本発明は鋳込み開始時に潤滑剤として連
鋳用モールドパウダとなたね油等の液体潤滑剤を同時に
用いるようにしたから１．０ｍ／ｍｉｎ2 以上の高い増
速率の時でもブレークアウトの発生を抑制して鋳造がで
きるようになった。またこのため鋳込時間も短縮するこ
とができるようになったため生産能力も向上するという
効果もある。According to the present invention, a mold powder for continuous casting and a liquid lubricant such as rapeseed oil are used at the same time as a lubricant at the start of casting, so that breakout can be achieved even at a high speed increasing rate of 1.0 m / min 2 or more. It became possible to suppress the occurrence and cast. Further, since the casting time can be shortened, the production capacity can be improved.
【図１】本発明の実施例を示す部分概略図である。FIG. 1 is a partial schematic view showing an embodiment of the present invention.
【図２】従来モールドパウダ鋳造法における平均増速率
とモールドパウダ消費量の関係を示すグラフである。FIG. 2 is a graph showing a relationship between an average speedup rate and mold powder consumption in a conventional mold powder casting method.
【図３】従来モールドパウダ鋳造法と本発明法について
ブレークアウトの発生率と平均増速率の関係を示すグラ
フである。FIG. 3 is a graph showing the relationship between the breakout occurrence rate and the average speedup rate for the conventional mold powder casting method and the method of the present invention.
１ 鋳型長辺 ２ 鋳片凝固シェル ３ 溶鋼 ４ａ モールドパウダ（粉末状態） ４ｂ モールドパウダ（焼結状態） ４ｃ モールドパウダ（溶融状態） ５ 液体潤滑剤注入管 ６ 液体潤滑剤 1 Mold Long Side 2 Cast Piece Solidified Shell 3 Molten Steel 4a Mold Powder (Powder State) 4b Mold Powder (Sintered State) 4c Mold Powder (Fused State) 5 Liquid Lubricant Injection Pipe 6 Liquid Lubricant
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 //(Ｃ１０Ｍ 169/04 101:02 159:08 129:68） Ｃ１０Ｎ 40:36 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location // (C10M 169/04 101: 02 159: 08 129: 68) C10N 40:36
Claims (4)
ト時又はタンディッシュ交換後の鋳込み開始時の増速時
に、鋳型と鋳片の間の潤滑剤として連鋳用モールドパウ
ダと液体潤滑剤とを同時に供給して鋳造することを特徴
とする鋼の連続鋳造方法。1. A continuous casting mold powder and a liquid lubricant are simultaneously supplied as a lubricant between a mold and a slab at the time of increasing the speed at the start of a dummy bar in continuous casting of steel or at the start of casting after tundish exchange. A method for continuous casting of steel, characterized in that
2 以上であることを特徴とする請求項１記載の鋼の連続
鋳造方法。2. The speed increasing rate during the speed increasing is 1.0 m / min.
The method for continuous casting of steel according to claim 1, wherein the number is 2 or more.
肪酸エステル、またはこれらの混合物であることを特徴
とする請求項１又は２記載の鋼の連続鋳造方法。3. The continuous casting method for steel according to claim 1, wherein the liquid lubricant is vegetable oil, mineral oil, fatty acid ester, or a mixture thereof.
ことを特徴とする請求項１、２又は３記載の鋼の連続鋳
造方法。4. The continuous casting method for steel according to claim 1, 2 or 3, wherein a solid lubricant is mixed with the liquid lubricant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12744496A JP3536530B2 (en) | 1996-05-22 | 1996-05-22 | Steel continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12744496A JP3536530B2 (en) | 1996-05-22 | 1996-05-22 | Steel continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09308949A true JPH09308949A (en) | 1997-12-02 |
| JP3536530B2 JP3536530B2 (en) | 2004-06-14 |
Family
ID=14960092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12744496A Expired - Lifetime JP3536530B2 (en) | 1996-05-22 | 1996-05-22 | Steel continuous casting method |
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| Country | Link |
|---|---|
| JP (1) | JP3536530B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769526A (en) * | 2022-04-27 | 2022-07-22 | 重庆钢铁股份有限公司 | Method for preventing ladle replacement joint mark steel leakage of continuous casting machine |
-
1996
- 1996-05-22 JP JP12744496A patent/JP3536530B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769526A (en) * | 2022-04-27 | 2022-07-22 | 重庆钢铁股份有限公司 | Method for preventing ladle replacement joint mark steel leakage of continuous casting machine |
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| Publication number | Publication date |
|---|---|
| JP3536530B2 (en) | 2004-06-14 |
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