JPH0199760A - Method for preventing clogging of immersion nozzle in continuous casting - Google Patents
Method for preventing clogging of immersion nozzle in continuous castingInfo
- Publication number
- JPH0199760A JPH0199760A JP25733387A JP25733387A JPH0199760A JP H0199760 A JPH0199760 A JP H0199760A JP 25733387 A JP25733387 A JP 25733387A JP 25733387 A JP25733387 A JP 25733387A JP H0199760 A JPH0199760 A JP H0199760A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- nozzle
- molten steel
- mold
- clogging
- 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
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009749 continuous casting Methods 0.000 title claims abstract description 9
- 238000007654 immersion Methods 0.000 title claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 238000004090 dissolution Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 11
- 230000005587 bubbling Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 67
- 238000005266 casting Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- 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、従来から連続鋳造のイマージツンノズルにガ
スを吹き込みノズル閉塞防止を図っているが、このとき
生ずる鋳片への介在物混入、すなわち製品の品質欠陥を
防止するためになされたものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention has conventionally attempted to prevent nozzle clogging by blowing gas into an imagine-tuned nozzle in continuous casting. In other words, this was done to prevent product quality defects.
〈従来の技術〉
溶鋼の連続鋳造において、タンディツシュと鋳型との間
に注入流の流路をなすイマージョンノズルが使用され、
このノズルの閉塞を防止するために、ガスをノズル内に
吹き込む方法が採用されているが、この際のガスが鋳型
内で浴面上に完全に浮上しな（その一部が介在物を伴っ
て鋳片中にトラップされ、製品の品質欠陥となる。ノズ
ルには第１図に示すような装置が使用されるが、吹き込
みガスとしては溶鋼への溶解がほとんど無視できるアル
ゴンガスや溶解速度の小さい窒素ガスが主に用いられて
いる０本方法は、ノズル内を流れるアルゴンガス（以下
Ａｒと略記）がノズル内壁を洗浄することにより、ノズ
ル内壁へのアルミナ（以下ｆｉＪ ｚ Ｏｓと略記）の
付着や溶鋼の凝固付着を防止し、ノズルの鋳造中の閉塞
を防止する上で極めて効果的な方法である０本方法はア
ルミニウム（以下Ｍと略記）で脱酸された、換言すれば
実質的にＭを含有する鋼の連続鋳造を安定して長時間行
うのに優れた技術であり、広く工業的に用いられている
０本方法ではノズル内に吹き込まれた＾ｒあるいはＮ、
ガスは、その大部分がノズル内を溶鋼と共に流下し、気
泡として鋳型内に流入する。これらの気泡は、鋳型内の
鋼浴上に浮上することとなる。<Prior art> In continuous casting of molten steel, an immersion nozzle is used that forms a flow path for the injection flow between the tundish and the mold.
In order to prevent this nozzle from clogging, a method is adopted in which gas is blown into the nozzle. This is trapped in the slab and causes quality defects in the product.A device as shown in Figure 1 is used for the nozzle, but the blowing gas is argon gas whose dissolution into the molten steel is negligible, or argon gas whose dissolution rate is low. In the zero method, in which a small nitrogen gas is mainly used, argon gas (hereinafter abbreviated as Ar) flowing inside the nozzle cleans the nozzle inner wall, thereby removing alumina (hereinafter abbreviated as fiJ z Os) to the nozzle inner wall. This method is extremely effective in preventing adhesion and solidification adhesion of molten steel and preventing blockage during nozzle casting. It is an excellent technique for stably continuous casting of steel containing M in
Most of the gas flows down the nozzle together with the molten steel and flows into the mold as bubbles. These bubbles will float above the steel bath within the mold.
しかし、これらの気泡のうちで極く一部は鋼浴上に浮上
する機会をなくして、注入流とともに鋳型内の鋼浴中の
深くまで侵入し、鋳型あるいはそれ以後の領域で凝固中
の鋳片の凝固殻にトラップされることがある。鋳造後の
鋳片を破断して調査するとこれらのトラップされた気泡
は、鋳片の表面近傍に存在するが、さらに詳細に観察す
ると、これらの気泡はｋｌ ｔ Ｏｓなどの介在物を伴
い、その後の圧延過程を経て冷延鋼板の製品となっても
その痕跡をとどめて、製品の欠陥となる。However, a small portion of these bubbles do not have a chance to float above the steel bath, and penetrate deep into the steel bath in the mold along with the injection flow, causing the solidifying cast in the mold or in the subsequent region. May be trapped in the solidified shell of the fragment. When the slab after casting is fractured and investigated, these trapped air bubbles are found near the surface of the slab, but when observed in more detail, these bubbles are accompanied by inclusions such as kl t Os, and then Even after the cold-rolled steel sheet is made into a product through the rolling process, traces of it remain, resulting in defects in the product.
以上の気泡の鋳片へのトラップの度合いは、鋳型への注
入流の流入様式や鋳造速度に大きく影響され、注入流の
流動様式を改善すべくノズル先端部の形状変更などの最
適化が行われている。しかし、生産性の向上を目指して
鋳造速度を増大すると、気泡の鋳片へのトラップされる
量が増大し、問題は完全には解決されていない。The degree of trapping of the air bubbles in the slab is greatly influenced by the flow pattern of the injection flow into the mold and the casting speed, and optimization such as changing the shape of the nozzle tip is performed to improve the flow pattern of the injection flow. It is being said. However, when the casting speed is increased with the aim of improving productivity, the amount of air bubbles trapped in the slab increases, and the problem has not been completely solved.
〈発明が解決しようとする問題点〉
本発明は、従来の方法によると前述のとおり鋳片の凝固
殻に介在物を伴った気泡がトラップされて製品に表面欠
陥が生じ易いという欠点があったので、これらの欠点を
克服し、製品の表面欠陥を防止できるイマージ！ンノズ
ルの閉塞防止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 has the drawback that, as mentioned above, air bubbles with inclusions are likely to be trapped in the solidified shell of the slab, resulting in surface defects in the product. So Image can overcome these shortcomings and prevent product surface defects! This invention was developed to provide a method for preventing clogging of the nozzle.
く問題点を解決するための手段〉
本発明は、鋼浴の深さが３ｍ以上といった大型の取鍋の
底部から、種々のガスを溶鋼中に吹き込んだ場合の浴面
の観察結果に基づいて生まれたものである。すなわち従
来用いられていたＡｒガスやＮｔガスを溶鋼中に底部か
ら吹き込むと浴中を浮上し、浴面に到達し大気中に放散
される現象が観察されるが、Ｈ□ガス、ＣＯガスあるい
はＣ，Ｈ，などの炭化水素ガスを溶鋼中に吹き込んでも
浴面への浮上は観察されず浴中の浮上過程において浴中
に吸収されてしまっているという現象に基づいて本発明
はなされたものである。Means for Solving the Problems> The present invention is based on the observation results of the bath surface when various gases are blown into molten steel from the bottom of a large ladle, such as a steel bath with a depth of 3 m or more. It is something that was born. In other words, when traditionally used Ar gas or Nt gas is blown into molten steel from the bottom, a phenomenon is observed in which it floats through the bath, reaches the bath surface, and is dissipated into the atmosphere, but H□ gas, CO gas or The present invention was made based on the phenomenon that even when hydrocarbon gases such as C, H, etc. are blown into molten steel, they are not observed to float to the bath surface, but are absorbed into the bath during the floating process. It is.
本発明は、連続鋳造のタンディツシュと鋳型との間のイ
マージ５ンノズル内にガスを吹き込み、該ノズルの閉塞
を防止する方法において、該ガスとして溶鋼への溶解速
度が大きいガスを、単独あるいは混合ガスとして吹き込
むことを特徴とする連続鋳造のイマージ５ンノズルの閉
塞防止方法、である。The present invention is a method for blowing gas into an imaginary nozzle between a tundish and a mold in continuous casting to prevent clogging of the nozzle. This is a method for preventing blockage of an imaginary nozzle for continuous casting, characterized by blowing as a jet.
〈発明をなすに至った経過と作用〉
Ｈ８ガスなどの溶鋼への溶解度と溶解速度が大きいガス
は比較的短時間で溶鋼中に下記の反応で溶解する。<Process and effects leading to the invention> Gases such as H8 gas which have high solubility and dissolution rate in molten steel dissolve in molten steel in a relatively short time by the following reaction.
Ｈｚ →２且
ＣＯ→旦＋立
ＣｓＨｍ→３旦＋８ｉ
Ｍ脱酸された溶鋼や、通常の水素濃度ｓ ｐ ｐ ｍ、
以下の溶鋼ではこれらの反応が進行することは熱力学的
にも合理的である。Hz → 2 and CO → dan + standing CsHm → 3 dan + 8i M deoxidized molten steel, normal hydrogen concentration s p p m,
It is thermodynamically rational that these reactions proceed in the following molten steel.
以上の結果に基づき第１図に示す装置において、ノズル
閉塞防止用のガスとしてＨ！ガスやＣＯガスを用いた実
験を行った。鋳造中の鋳型内の浴面を観察すると、浴面
上に浮上するガス気泡の量は、従来のＡｒガスやＮ２ガ
スの場合と比較しては大幅に減少し、吹き込み量に対し
て極くわずかの量が浮上するのみで、他の大部分のガス
は、ノズル内の流下中あるいはノズルから鋳型内に流入
して浴中を浮上する間に溶鋼中に溶解・吸収されること
によるものと考えられた０以上の結果は、鋳型内の浴中
に流入した気泡のうち、浴上への浮上の機会をなくして
、鋳型内の浴中深くまで巻き込まれた気泡も、上述と同
様に溶鋼中に溶解・吸収されるので、鋳片にトラップさ
れる気泡が大幅に減少するものと考えられ、後述のよう
にトラップされた気泡に基づ（製品欠陥が大幅に減少し
た。Based on the above results, in the device shown in Figure 1, H! Experiments were conducted using gas and CO gas. Observing the bath surface in the mold during casting, the amount of gas bubbles floating on the bath surface is significantly reduced compared to conventional Ar gas or N2 gas, and is extremely small compared to the amount of gas blown into the mold. Only a small amount of the gas floats to the surface, and most of the other gas is dissolved and absorbed into the molten steel while flowing down in the nozzle or flowing into the mold from the nozzle and floating in the bath. The considered result of 0 or more means that among the air bubbles that flow into the bath in the mold, there is no chance of them floating to the top of the bath, and the air bubbles that are drawn deep into the bath in the mold are also absorbed into the molten steel in the same way as described above. It is thought that the number of air bubbles trapped in the slab is greatly reduced, and as will be described later, product defects have been significantly reduced based on the trapped air bubbles.
ところで、■！ガスＣＯガスの溶解が非常に速く、吹込
みと同時に瞬時に生じるのであればガスを吹き込まない
のと同じこととなり、ノズル閉塞の防止効果が発揮され
ないこととなるが、ノズル閉塞の防止効果について、従
来のＡｒガス法と比較するとＡｒガスよりも少し多いガ
ス流量を用いるとＨｔガスやＣＯガスでも十分に閉塞防
止効果のあることが判明した。このことは、ノズル内の
溶鋼は毎秒１〜３ｍの速度で下方に流れているのでこの
流れに乗って気泡も下方に流れるので、ノズル内での気
泡の滞在時間が０．５秒以下と短く、大部分の気泡は溶
解することなくノズル閉塞防止効果を発渾し、ノズルか
ら鋳型の溶鋼中に流入し、浴中の浮上過程で溶鋼中に溶
解するものと考えられる。By the way, ■! If the gas CO gas dissolves very quickly and occurs instantly at the same time as blowing, it would be the same as not blowing gas, and the effect of preventing nozzle clogging will not be exhibited. In comparison with the conventional Ar gas method, it has been found that even Ht gas or CO gas has a sufficient blockage prevention effect when a gas flow rate slightly higher than that of Ar gas is used. This means that since the molten steel in the nozzle is flowing downward at a speed of 1 to 3 meters per second, the bubbles also flow downward along with this flow, so the residence time of the bubbles in the nozzle is short, less than 0.5 seconds. It is thought that most of the bubbles develop the effect of preventing nozzle clogging without dissolving, flow into the molten steel in the mold from the nozzle, and dissolve into the molten steel during the floating process in the bath.
〈実施例〉 以下に実施例について説明する。<Example> Examples will be described below.
２ストランドのスラブ連鋳機において内径が７０−のア
ルミナグラファイト製でノズル出口の水平線となす角が
３０度の逆Ｙ型状イマージ町ンノズルを用い、２６０■
Ｘ １３００■の断面の２基の鋳型に低炭素アルミキル
ド鋼を１基の鋳型当り４ ｔｏｎ／ｍの速度で注入した
。この条件で１本のノズルには、上部から溶鋼への溶解
度が２４ｐｐｍである８意ガスを１０〜３ＯＮ７／＊の
速度で吹き込みもう一方の鋳型用のノズルには従来法に
よる溶鋼への溶解度が実質的でないＡｒガスを１０〜２
ＯＮｊ／歯の速度で吹き込みノズル閉塞の防止を図った
。この条件で２７０ｔｏｎの溶鋼を保持する取鍋内の溶
鋼を５鍋連続して注入した。Ｉ（、ガス吹きのノズルを
用いるストランドとＡｒガス吹きのノズルを用いるスト
ランドともに、ノズル閉塞は生じず鋳造速度を所定値に
維持した安定した鋳造が可能であった。また、鋳造終了
後、両方のノズルを回収して内壁を観察したがＡｊ ｚ
Ｏｓの付着状況は同一で、Ｈ富ガスとＡｒガスの差は
認められなかった。さらにこれらの鋳造された鋳片を熱
間圧延と冷間圧延をして０．７−厚さの綱板製品を得た
が、トラップされた気泡に基づく製品の表面欠陥の発生
率は、ｈガス使用ノズルを用いたストランドの鋳片で０
．２４％、Ａｒガス使用ノズルを用いたストランドの鋳
片で０．７６％であり、本発明のＨ８ガスを用いると、
約１／３に減少することが明らかである。In a 2-strand continuous slab casting machine, an inverted Y-shaped image nozzle made of alumina graphite with an inner diameter of 70 mm and an angle of 30 degrees with the horizontal line at the nozzle outlet was used.
Low carbon aluminum killed steel was injected into two molds with a cross section of 1300 mm at a rate of 4 ton/m per mold. Under these conditions, one nozzle is blown from the upper part with a gas having a solubility in molten steel of 24 ppm at a rate of 10 to 3 ON7/*, and the other mold nozzle has a solubility in molten steel of the conventional method. 10-2% of non-substantive Ar gas
The ONj/tooth speed was used to prevent blowing nozzle clogging. Under these conditions, molten steel in a ladle holding 270 tons of molten steel was continuously poured into five ladle. In both the strand using the gas-blown nozzle and the strand using the Ar gas-blown nozzle, stable casting was possible while maintaining the casting speed at a predetermined value without causing nozzle blockage. I collected the nozzle and observed the inner wall, but Aj z
The adhesion status of Os was the same, and no difference was observed between the H-rich gas and the Ar gas. Furthermore, these cast slabs were hot-rolled and cold-rolled to obtain a steel sheet product with a thickness of 0.7, but the incidence of surface defects in the product due to trapped air bubbles was h 0 for strand slabs using gas nozzles
．． 24%, and 0.76% in a strand slab using an Ar gas nozzle, and when using the H8 gas of the present invention,
It is clear that the amount is reduced by about 1/3.
また、水素ガスをノズルに吹き込むと、溶鋼の水素濃度
が上昇することが懸念されるが、本実施例の場合、Ａｒ
ガス使用と比較して水素濃度はｏ、５ｐｐ−以下の増加
量であり、冷延鋼板の品質に影響するレベルではないこ
とが明らかとなった。この結果は、使用した水素ガスが
溶鋼中に全量吸収されたとして算出される水素濃度上昇
量とほぼ一致する。In addition, there is a concern that the hydrogen concentration in molten steel will increase when hydrogen gas is blown into the nozzle, but in the case of this example, Ar
It was revealed that the hydrogen concentration increased by less than 5 pp- compared to the case of using gas, which is not at a level that would affect the quality of the cold rolled steel sheet. This result almost coincides with the amount of increase in hydrogen concentration calculated assuming that the entire amount of hydrogen gas used was absorbed into the molten steel.
同様に、Ａｒガスと脱酸された溶鋼への溶解度が非常に
大きいＣＯガスとの比較実験を行った。この場合にもノ
ズルの閉塞は、ＣＯガスノズル、 Ａｒガスノズルとも
に皆無であり、ＣＯガスがＡｒガスと同等のノズル閉塞
防止効果のあることが明らかとなった。また、同様に０
．６■厚さの冷延鋼板の品質を調査したが、ＣＯガス使
用ノズルを用いたストランドの鋳片の製品では、Ａｒガ
スのそれと比較して、表面欠陥の発生率が約１／３とな
った。この場合にはＣＯガスは炭素と酸素に分解して吸
収され、ＣＯガスを用いると鋳片の炭素と酸素濃度が上
昇することが予想されるが、分析結果によると炭素濃度
４００〜６００ｐｐ−の鋳片において炭素の濃度増加は
実質的には認められなかった。酸素濃度は、鋳片で１７
〜２６９ｐ諺であったが、Ａｒノズル使用ストランドと
比較して１〜２９ＰＩｍの増加であり、実質的な濃度増
加とは認められない程度であった。この値についても、
使用したＣＯガスが全量吸収されたとして算出される炭
素と酸素の濃度増加量が約３ｐｐ■と推算されるので、
使用したガスの全量が溶解するわけではないことを考え
ると、炭素と酸素の実質的な濃度増加は生じないこｔが
明らかである。Similarly, a comparative experiment was conducted between Ar gas and CO gas, which has a very high solubility in deoxidized molten steel. In this case as well, there was no nozzle clogging for either the CO gas nozzle or the Ar gas nozzle, making it clear that CO gas has the same nozzle clogging prevention effect as Ar gas. Also, similarly 0
．． We investigated the quality of cold-rolled steel sheets with a thickness of 6■ and found that the incidence of surface defects in strand slab products using CO gas nozzles was approximately 1/3 that of those using Ar gas. Ta. In this case, CO gas is decomposed into carbon and oxygen and absorbed, and it is expected that the carbon and oxygen concentrations in the slab will increase if CO gas is used, but the analysis results show that the carbon concentration is 400 to 600 pp- Substantially no increase in carbon concentration was observed in the slab. The oxygen concentration in slabs is 17
-269p, but compared to the strand using the Ar nozzle, this was an increase of 1 to 29PIm, and was not recognized as a substantial increase in concentration. Also regarding this value,
The increase in the concentration of carbon and oxygen is estimated to be approximately 3 pp■, assuming that the entire amount of CO gas used is absorbed.
Considering that not all of the gas used is dissolved, it is clear that no substantial increase in the concentration of carbon and oxygen occurs.
以上の説明は、Ｈ８ガスとＣＯガスを例にして説明した
が、その他、溶鋼への溶解度が大きく、なおかつ溶解速
度が大きいＣ１，などの炭化水素系ガスなども使用可能
であり、またこれらのガスの混合したものの使用も可能
であり、本発明に使用されるガスはＣＯガスとｈガスに
限定されるものではない。The above explanation uses H8 gas and CO gas as examples, but other hydrocarbon gases such as C1, which have a high solubility in molten steel and a high dissolution rate, can also be used. It is also possible to use a mixture of gases, and the gases used in the present invention are not limited to CO gas and h gas.
また、ガスの吹込みについて、ノズル部に吹き込む方法
について説明したが、本発明はこれに限定されるもので
なく、溶解性ガスをノズル入口より上方部から溶解流と
ともにノズル部に流入させる方法も適用可能である。Further, regarding the blowing of gas, although a method of blowing into the nozzle section has been described, the present invention is not limited to this, and a method of flowing soluble gas into the nozzle section from above the nozzle inlet together with the dissolved flow is also possible. Applicable.
〈発明の効果〉
本発明によると、イマージコンノズル閉塞の防止が従来
法のＡｒガス又はＮ８ガス使用の場合と同じ程度にでき
、さらに従来法では完全な防止が不可能であった凝固殻
にトラップされて鋳片に入り込むガス気泡によって発生
していた製品の表面欠陥が防止できた。<Effects of the Invention> According to the present invention, it is possible to prevent the Imagicon nozzle from clogging to the same degree as when using Ar gas or N8 gas in the conventional method, and furthermore, it is possible to prevent the blockage of the Imagicon nozzle to the same degree as in the case of using Ar gas or N8 gas in the conventional method. Surface defects on the product that were caused by gas bubbles that were trapped and entered the slab were prevented.
第１図は、本発明を説明するための装置の断面図である
。
１・・・タンディツシュ、 ２・・・溶 鋼、３
・・・イマージョンノズル、 ４・・・ガス配管、５・
・・鋳 型、 ６・・・凝固殻。
特許出願人 川崎製鉄株式会社
第１図FIG. 1 is a sectional view of an apparatus for explaining the present invention. 1... Tanditshu, 2... Molten steel, 3
...Immersion nozzle, 4.Gas piping, 5.
... Mold, 6... Solidified shell. Patent applicant: Kawasaki Steel Corporation Figure 1
Claims (1)
ノズル内にガスを吹き込み、該ノズルの閉塞を防止する
方法において、該ガスとして溶鋼への溶解速度が大きい
ガスを、単独あるいは混合ガスとして吹き込むことを特
徴とする連続鋳造のイマージョンノズルの閉塞防止方法
。In a method of blowing gas into an immersion nozzle between a tundish and a mold in continuous casting to prevent clogging of the nozzle, it is possible to blow a gas having a high dissolution rate into molten steel singly or as a mixed gas. A method for preventing blockage of continuous casting immersion nozzles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257333A JP2554105B2 (en) | 1987-10-14 | 1987-10-14 | Method for preventing blockage of immersion nozzle in continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62257333A JP2554105B2 (en) | 1987-10-14 | 1987-10-14 | Method for preventing blockage of immersion nozzle in continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0199760A true JPH0199760A (en) | 1989-04-18 |
| JP2554105B2 JP2554105B2 (en) | 1996-11-13 |
Family
ID=17304904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62257333A Expired - Fee Related JP2554105B2 (en) | 1987-10-14 | 1987-10-14 | Method for preventing blockage of immersion nozzle in continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2554105B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020006407A (en) * | 2018-07-09 | 2020-01-16 | 日本製鉄株式会社 | Continuous casting facility and continuous casting method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6238747A (en) * | 1985-08-12 | 1987-02-19 | Kawasaki Steel Corp | Continuous casting method for slab for thin cold rolled sheet of dead soft steel without blister defect in annealing stage |
-
1987
- 1987-10-14 JP JP62257333A patent/JP2554105B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6238747A (en) * | 1985-08-12 | 1987-02-19 | Kawasaki Steel Corp | Continuous casting method for slab for thin cold rolled sheet of dead soft steel without blister defect in annealing stage |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020006407A (en) * | 2018-07-09 | 2020-01-16 | 日本製鉄株式会社 | Continuous casting facility and continuous casting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2554105B2 (en) | 1996-11-13 |
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