JP2000126850A - Continuous casting method - Google Patents
Continuous casting methodInfo
- Publication number
- JP2000126850A JP2000126850A JP10304294A JP30429498A JP2000126850A JP 2000126850 A JP2000126850 A JP 2000126850A JP 10304294 A JP10304294 A JP 10304294A JP 30429498 A JP30429498 A JP 30429498A JP 2000126850 A JP2000126850 A JP 2000126850A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- mold
- flow
- immersion nozzle
- inert 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000009749 continuous casting Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 133
- 239000010959 steel Substances 0.000 claims abstract description 133
- 238000007654 immersion Methods 0.000 claims abstract description 62
- 239000011261 inert gas Substances 0.000 claims abstract description 45
- 238000005266 casting Methods 0.000 claims abstract description 15
- 230000005499 meniscus Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims description 11
- 230000007547 defect Effects 0.000 abstract description 30
- 239000000843 powder Substances 0.000 abstract description 16
- 230000003749 cleanliness Effects 0.000 abstract description 15
- 238000007598 dipping method Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 6
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 101000974007 Homo sapiens Nucleosome assembly protein 1-like 3 Proteins 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 102100022398 Nucleosome assembly protein 1-like 3 Human genes 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
(57)【要約】
【課題】鋳造中に浸漬ノズルが詰りにくく、鋳片表面に
ピンホール性欠陥やパウダ性欠陥がなく、かつ、清浄性
にも優れた鋳片が得られる連続鋳造方法の提供。
【解決手段】鋳型内の溶鋼のメニスカス近傍での溶鋼流
速を、タンディッシュの鋳型への給湯孔から浸漬ノズル
の吐出孔の間で吹き込まれた不活性ガスにより発生する
浸漬ノズル近傍から鋳型の短辺に向かう流れ９ｄの最大
値と鋳型の短辺側から浸漬ノズルに向かう流れ９ｃの最
大値との差が２０ｃｍ／秒以下となるように制御する。
[PROBLEMS] To provide a continuous casting method that can obtain a slab excellent in cleanliness without immersion nozzle clogging during casting, free of pinhole defects and powder defects on the slab surface. Offer. The flow rate of molten steel in the mold near the meniscus of the molten steel is reduced from the vicinity of the dipping nozzle generated by the inert gas blown from the hot water supply hole to the tundish mold to the discharge hole of the dipping nozzle. The difference between the maximum value of the flow 9d toward the side and the maximum value of the flow 9c from the short side of the mold toward the immersion nozzle is controlled to be 20 cm / sec or less.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋳造中に溶鋼中の
酸化物による浸漬ノズルの詰まりが発生することなく、
鋳片表面にピンホール性欠陥やパウダ性欠陥がなくて表
面性状に優れ、かつ清浄度にも優れた鋳片を得ることが
可能な鋼の連続鋳造方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a method and an apparatus for manufacturing a cast iron, wherein clogging of an immersion nozzle by an oxide in molten steel does not occur during casting.
The present invention relates to a continuous casting method of steel capable of obtaining a slab excellent in surface properties and having excellent cleanliness without pinhole defects or powder defects on the slab surface.
【０００２】[0002]
【従来の技術】鋼の連続鋳造では、生産性の向上のた
め、連続して長時間の鋳造を可能にすることが重要な課
題である。しかし、溶鋼中には鋳片に残存し非金属介在
物となる酸化物が存在し、長時間の鋳造にともない、こ
の酸化物が浸漬ノズルの内壁に付着し、最終的には浸漬
ノズルが閉塞する場合がある。2. Description of the Related Art In continuous casting of steel, it is important to continuously cast steel for a long time in order to improve productivity. However, in the molten steel, oxides that remain in the slab and become non-metallic inclusions exist, and with the long-time casting, these oxides adhere to the inner wall of the immersion nozzle, and eventually the immersion nozzle is closed. May be.
【０００３】この浸漬ノズルの閉塞を防止するために、
タンディッシュの鋳型への給湯孔から浸漬ノズルの吐出
孔の間で、溶鋼中に不活性ガスを吹き込む方法が提案さ
れている。In order to prevent the clogging of the immersion nozzle,
A method has been proposed in which an inert gas is blown into molten steel from a hot water supply hole to a tundish mold to a discharge hole of a dipping nozzle.
【０００４】特開平２−３７９４８号公報には、鋳造速
度に応じて浸漬ノズル内の溶鋼中への不活性ガスの吹き
込み量を３．０〜５．０リットル／溶鋼ｔとすることに
より、浸漬ノズルの閉塞を防止する方法が提案されてい
る。しかし、この方法では、吹き込む量が多すぎて、鋳
片の表面に不活性ガスの気泡に起因するピンホール性の
欠陥が発生する場合がある。[0004] Japanese Patent Application Laid-Open No. 2-37948 discloses that the amount of inert gas blown into molten steel in an immersion nozzle is adjusted to 3.0 to 5.0 liters / t of molten steel according to the casting speed. Methods for preventing nozzle blockage have been proposed. However, in this method, the amount of air blown is too large, and a pinhole defect may be generated on the surface of the slab due to bubbles of the inert gas.
【０００５】ピンホール性欠陥は、その後の熱間圧延や
冷間圧延の際に製品の鋼板に残存し、鋼板の表面が膨れ
る、いわゆるふくれ疵と称される製品の欠陥となる場合
がある。また、鋳片の表面をスカーフィング（酸素ガス
による表面の溶削）により手入れする場合に、手入れさ
れた鋳片の表面に開口した気泡の穴が残存し、熱間圧延
前に鋳片を加熱炉で加熱する際に、酸化して生成したス
ケールがこの気泡の穴に残存し、圧延した製品の鋼板の
表面にへげ疵と称される線状欠陥が発生する場合があ
る。[0005] The pinhole defect may remain in the steel sheet of the product during the subsequent hot rolling or cold rolling and cause a product defect called a so-called blister, which causes the surface of the steel sheet to swell. In addition, when the surface of the cast slab is groomed by scarfing (cutting of the surface with oxygen gas), holes of air bubbles that remain open on the surface of the groomed slab remain, and the slab is heated before hot rolling. When heated in a furnace, scales generated by oxidation remain in the pores of the bubbles, and linear defects called dents may occur on the surface of the rolled product steel sheet.
【０００６】とくに、自動車用の鋼板に用いられる炭素
含有量が５０ｐｐｍ以下の極低炭素鋼の鋳片には、上述
したピンホール性の欠陥が発生しやすい。ピンホール性
欠陥を防止するため、浸漬ノズルに吹き込む不活性ガス
の量を減らすと、鋳造中に浸漬ノズルの詰まりが発生し
やすくなる。また、鋳型内の凝固殻に未溶融のモールド
パウダが捕捉されて、鋳片の表面にパウダ性欠陥も発生
しやすい。[0006] In particular, the above-mentioned defect of the pinhole property is liable to occur in a cast piece of ultra-low carbon steel having a carbon content of 50 ppm or less used for a steel sheet for automobiles. If the amount of inert gas blown into the immersion nozzle is reduced in order to prevent pinhole defects, clogging of the immersion nozzle during casting tends to occur. In addition, unmelted mold powder is captured by the solidified shell in the mold, and powder defects are likely to occur on the surface of the slab.
【０００７】極低炭素鋼の鋳片の表面のピンホール性欠
陥や浸漬ノズルの詰まりの対策として、特開平９−１９
２８０３号公報では、鋳造速度に応じて、浸漬ノズルに
約４リットル／溶鋼ｔの量の不活性ガスを吹き込み、か
つ両側の浸漬ノズルと鋳型の短辺との間に、移動磁場印
加装置を配置し、溶鋼の表面に浮上してくる不活性ガス
の量が、両側の浸漬ノズルと鋳型の短辺との間で、同じ
量になるように移動磁場印加装置を制御することが提案
されている。As measures against pinhole defects on the surface of a slab of ultra-low carbon steel and clogging of an immersion nozzle, Japanese Patent Application Laid-Open No. 9-19 / 1991 has been proposed.
In the publication 2803, according to the casting speed, an inert gas is blown into an immersion nozzle in an amount of about 4 liters / t of molten steel, and a moving magnetic field applying device is arranged between the immersion nozzle on both sides and the short side of the mold. It has been proposed to control the moving magnetic field applying device so that the amount of the inert gas floating on the surface of the molten steel is the same between the immersion nozzles on both sides and the short side of the mold. .
【０００８】この方法は、鋳型内の溶鋼の表面に浮上し
てくる不活性ガスを回収し、測定された不活性ガスの量
にもとづき、浸漬ノズルを挟んで鋳型内の両側の移動磁
場の強さを独立に制御する方法である。しかし、回収し
た不活性ガスの量を、瞬時に、正確に測定することは困
難であり、また、鋳型内の溶鋼の流動は短時間で変化す
るので、回収したガス量の測定値にもとづいて溶鋼の流
動を制御することは困難な場合が多い。さらに、浸漬ノ
ズル内の溶鋼に吹き込む不活性ガス量が多すぎて、ピン
ホール性欠陥が発生しやすいという問題がある。In this method, an inert gas floating on the surface of molten steel in a mold is collected, and based on the measured amount of the inert gas, the strength of the moving magnetic field on both sides in the mold with the immersion nozzle interposed therebetween. This is a method of independently controlling the height. However, it is difficult to measure the amount of the recovered inert gas instantaneously and accurately, and the flow of molten steel in the mold changes in a short time. It is often difficult to control the flow of molten steel. Further, there is a problem in that the amount of inert gas blown into the molten steel in the immersion nozzle is too large, so that pinhole defects are likely to occur.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、鋳造中に浸
漬ノズルの詰まりが発生することなく、かつ鋳片表面に
ピンホール性欠陥やパウダ性欠陥がなくて表面性状に優
れ、かつ清浄度にも優れた鋳片を得ることが可能な鋼の
連続鋳造方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention provides an improved surface property without clogging of an immersion nozzle during casting, no pinhole or powdery defects on the slab surface, and cleanliness. It is an object of the present invention to provide a continuous casting method of steel capable of obtaining an excellent slab.
【００１０】[0010]
【課題を解決するための手段】本発明の要旨は、下記
（１）および（２）に示す連続鋳造方法にある。The gist of the present invention resides in a continuous casting method shown in the following (1) and (2).
【００１１】（１）吐出流が鋳型の短辺側に向かう吐出
孔を備える浸漬ノズルを用いるとともに、タンディッシ
ュの鋳型への給湯孔から上記浸漬ノズルの吐出孔の間
で、溶鋼中に不活性ガスを吹き込みつつ連続鋳造する方
法であって、鋳型内の溶鋼のメニスカス近傍での溶鋼流
速を、吹き込まれた上記不活性ガスにより発生する浸漬
ノズル近傍から鋳型の短辺に向かう流れの最大値と鋳型
の短辺側から浸漬ノズルに向かう流れの最大値との差が
２０ｃｍ／秒以下となるように制御する鋼の連続鋳造方
法。(1) An immersion nozzle having a discharge hole whose discharge flow is directed to the short side of the mold is used, and inert gas is introduced into the molten steel between the hot water supply hole to the mold of the tundish and the discharge hole of the immersion nozzle. A method of continuous casting while blowing gas, the molten steel flow velocity near the meniscus of the molten steel in the mold, the maximum value of the flow from the vicinity of the immersion nozzle generated by the injected inert gas toward the short side of the mold A continuous casting method for steel in which the difference from the maximum value of the flow from the short side of the mold to the immersion nozzle is controlled to be 20 cm / sec or less.
【００１２】（２）鋳型の長辺の外側に鋳型を挟んで設
けた電磁力による溶鋼流動制動装置により、鋳型内の溶
鋼の流動を制動しつつ、不活性ガスの吹き込み量０．２
〜３．０（Ｎリットル／溶鋼ｔ）の範囲内で鋳造する上
記（１）に記載の鋼の連続鋳造方法。(2) The flow rate of the inert gas is controlled to 0.2 while the flow of molten steel in the mold is braked by a molten steel flow braking device by electromagnetic force provided outside the long side of the mold with the mold interposed therebetween.
The continuous casting method for steel according to the above (1), wherein the steel is cast within a range of from 3.0 to 3.0 (N liter / molten steel t).
【００１３】極低炭素鋼の精錬過程では、溶鋼中のＡｌ
2 Ｏ3 の量が多くなりやすく、そのため、鋳造中に浸漬
ノズルが詰まりやすい。一方、浸漬ノズルの詰まりを防
止するために、浸漬ノズル内の溶鋼中に不活性ガスを吹
き込むと、吹き込まれた不活性ガスの気泡が、鋳型内の
凝固殻に捕捉されやすい。本発明の方法は、２つの課題
を同時に解決しようとするものである。In the refining process of ultra-low carbon steel, Al
The amount of 2 O 3 is likely to be large, so that the immersion nozzle is likely to be clogged during casting. On the other hand, when an inert gas is blown into molten steel in the immersion nozzle in order to prevent clogging of the immersion nozzle, bubbles of the blown inert gas are likely to be captured by the solidified shell in the mold. The method of the present invention seeks to solve two problems simultaneously.
【００１４】不活性ガスを吹き込む部分は、タンディッ
シュの鋳型への給湯孔から上記浸漬ノズルの吐出孔の間
に設ける。詳しくは後述する図２に示すように、タンデ
ィッシュ１の鋳型への給湯孔に備えた上ノズル耐火物
２、浸漬ノズル４を取り付けたスライディングプレート
３または浸漬ノズル４に設ける。The portion into which the inert gas is blown is provided between the hot water supply hole to the mold of the tundish and the discharge hole of the immersion nozzle. As shown in detail in FIG. 2 described later, the tundish 1 is provided on the upper nozzle refractory 2 provided for the hot water supply hole to the mold, the sliding plate 3 to which the immersion nozzle 4 is attached, or the immersion nozzle 4.
【００１５】鋳型内のメニスカス近傍の溶鋼流速とは、
溶鋼の表面から５０ｍｍ内の平均流速を意味する。詳し
くは後述する図１に示す鋳型内の溶鋼の流れにおいて、
溶鋼の吐出流９に起因する溶鋼の反転流９ｃおよび不活
性ガスに起因する溶鋼の流れ９ｄのことである。The molten steel flow velocity near the meniscus in the mold is
It means the average flow velocity within 50 mm from the surface of molten steel. In detail, in the flow of molten steel in the mold shown in FIG.
The reverse flow 9c of the molten steel caused by the discharge flow 9 of the molten steel and the flow 9d of the molten steel caused by the inert gas.
【００１６】吐出流に起因する溶鋼の反転流９ｃの流速
は、鋳型の短辺近傍で最大となる。また、不活性ガスに
起因する溶鋼の流れ９ｄの流速は、浸漬ノズル近傍で最
大となる。The flow rate of the reverse flow 9c of the molten steel caused by the discharge flow becomes maximum near the short side of the mold. Further, the flow velocity of the flow 9d of the molten steel caused by the inert gas becomes maximum near the immersion nozzle.
【００１７】本発明の方法では、溶鋼の反転流９ｃの流
速の最大値と不活性ガスによる溶鋼の流れ９ｄの流速の
最大値との差を２０ｃｍ／秒以下とするが、その理由は
次のとおりである。すなわち、それぞれの流速の最大値
との差をこの範囲の値とすることにより、浸漬ノズルの
詰まりの発生もなく、また、溶鋼の反転流９ｃと溶鋼の
流れ９ｄが衝突する位置で、溶鋼の湯面が波立つことも
なく、気泡や未溶融のパウダ８ａが凝固殻に捕捉される
こともないためである。In the method of the present invention, the difference between the maximum value of the flow rate of the reverse flow 9c of molten steel and the maximum value of the flow rate of the flow 9d of molten steel caused by the inert gas is set to 20 cm / sec or less. It is as follows. That is, by setting the difference between the maximum value of the flow velocity and the maximum value of the flow velocity in this range, clogging of the immersion nozzle does not occur, and the position of the reverse flow 9c of molten steel and the flow 9d of molten steel collide with each other. This is because the molten metal surface does not undulate, and bubbles and unmelted powder 8a are not trapped in the solidified shell.
【００１８】[0018]
【発明の実施の形態】図１は、吐出流の方向が鋳型６の
両側の短辺を向いている浸漬ノズル４を用い、浸漬ノズ
ル内の溶鋼中に不活性ガスを吹き込んだときの、鋳型内
の溶鋼１２の流動状況を模式的に示す図である。溶鋼の
吐出流９は、鋳型の短辺近傍の凝固殻１０に衝突後、上
下に分岐する。溶鋼の下降流９ｂと反対方向に向かう溶
鋼の上昇流９ａは、溶鋼の表面、すなわち、メニスカス
７に達した後、鋳型の短辺側から浸漬ノズルの方向に向
かう溶鋼の反転流９ｃとなり、浸漬ノズル近傍で潜り込
んで循環流となる。吹き込まれた不活性ガスは気泡１３
となり、この気泡は溶鋼中を浮上し、浸漬ノズル近傍の
位置で溶鋼の表面に達する。このとき、気泡の浮力によ
り形成された上向きの溶鋼の流れが溶鋼の表面に達して
後に、浸漬ノズルから鋳型短辺に向かう溶鋼の流れ９ｄ
が形成される。この溶鋼の流れ９ｄは、溶鋼の反転流９
ｃと衝突し、潜り込んで循環流となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a case where an immersion nozzle 4 whose discharge flow is directed to the short sides on both sides of a mold 6 and an inert gas is blown into molten steel in the immersion nozzle. It is a figure which shows typically the flow condition of the molten steel 12 inside. The molten steel discharge flow 9 collides with the solidified shell 10 near the short side of the mold and then branches up and down. The rising flow 9a of the molten steel flowing in the opposite direction to the descending flow 9b of the molten steel reaches the surface of the molten steel, that is, the meniscus 7, and then becomes a reverse flow 9c of the molten steel flowing from the short side of the mold toward the immersion nozzle. It sinks near the nozzle and forms a circulating flow. The injected inert gas is bubbles 13
The air bubbles float in the molten steel and reach the surface of the molten steel at a position near the immersion nozzle. At this time, after the upward flow of the molten steel formed by the buoyancy of the bubbles reaches the surface of the molten steel, the flow 9d of the molten steel from the immersion nozzle toward the short side of the mold is formed.
Is formed. The flow 9d of the molten steel is the reverse flow 9 of the molten steel.
It collides with c and sinks into a circulating flow.
【００１９】図２は、タンディッシュの鋳型への給湯
孔、浸漬ノズル、不活性ガスの吹き込み口３ａなどの配
置を模式的に示す図である。鋳型への給湯孔には上ノズ
ル耐火物２を配置し、浸漬ノズル４を取り付けたスライ
ディングプレート３を上ノズルに固定する。スライディ
ングプレートは、鋳型へ供給する溶鋼の流量を調整する
ための板状の耐火物である。FIG. 2 is a diagram schematically showing the arrangement of hot water supply holes to the mold of the tundish, immersion nozzles, inert gas blowing ports 3a, and the like. The upper nozzle refractory 2 is arranged in the hot water supply hole to the mold, and the sliding plate 3 to which the immersion nozzle 4 is attached is fixed to the upper nozzle. The sliding plate is a plate-like refractory for adjusting the flow rate of molten steel supplied to the mold.
【００２０】溶鋼中のＡｌ2 Ｏ3 などが浸漬ノズル４の
内壁や吐出孔５近傍に付着し、最終的には浸漬ノズルが
詰まり、鋳造ができなくなる。これを防止するため、多
孔質の耐火物や内径が０．５ｍｍ程度の微細径の鋼製の
管を複数個埋め込んだ不活性ガスの吹き込み口３ａの耐
火物を、上ノズル耐火物２やスライディングプレート３
または浸漬ノズル４に設け、不活性ガスを吹き込む。Al 2 O 3 and the like in the molten steel adhere to the inner wall of the immersion nozzle 4 and the vicinity of the discharge hole 5, and finally the immersion nozzle is clogged, so that casting cannot be performed. To prevent this, a porous refractory or a refractory of an inert gas blowing port 3a in which a plurality of fine-diameter steel pipes having an inner diameter of about 0.5 mm are embedded are inserted into an upper nozzle refractory 2 or a sliding nozzle. Plate 3
Alternatively, an inert gas is blown into the immersion nozzle 4.
【００２１】本発明の方法では、吹き込まれた不活性ガ
スにより発生する浸漬ノズルから鋳型の短辺に向かう溶
鋼流速の最大値と鋳型の短辺から浸漬ノズルに向かう溶
鋼流速の最大値との差を、２０ｃｍ／秒以下となるよう
に制御する。２０ｃｍ／秒を超える場合には、上述した
ように、溶鋼の反転流９ｃと溶鋼の流れ９ｄが衝突する
位置で、溶鋼の湯面が激しく波立ち、そのため気泡や未
溶融のパウダが凝固殻に捕捉されやすくなるからであ
る。In the method of the present invention, the difference between the maximum value of the flow rate of the molten steel from the immersion nozzle generated by the blown inert gas toward the short side of the mold and the maximum value of the flow rate of the molten steel from the short side of the mold toward the immersion nozzle. Is controlled to be 20 cm / sec or less. When the flow rate exceeds 20 cm / sec, the molten steel surface vibrates violently at the position where the reverse flow 9c of the molten steel and the flow 9d of the molten steel collide as described above, so that bubbles and unmelted powder are trapped in the solidified shell. This is because it is easy to be done.
【００２２】メニスカス近傍の溶鋼の流速は、溶鋼に浸
漬するタイプのカルマン渦の発生原理を応用した流速計
を用いることもできるし、溶鋼に対して非接触式のもの
を用いてもよい。The flow velocity of the molten steel in the vicinity of the meniscus may be a flow meter which utilizes the principle of generating Karman vortices of the type immersed in the molten steel, or may be a non-contact type flow meter for the molten steel.
【００２３】吐出流に起因する溶鋼の反転流９ｃの流速
の最大値および不活性ガスに起因する溶鋼の流れ９ｄの
流速の最大値は、鋳型の短辺近傍および浸漬ノズル近傍
で、それぞれ２〜３の位置で測定することにより求めら
れる。The maximum value of the flow velocity of the reverse flow 9c of the molten steel caused by the discharge flow and the maximum value of the flow velocity of the flow 9d of the molten steel caused by the inert gas are 2 to 2 near the short side of the mold and near the immersion nozzle, respectively. It is determined by measuring at position 3.
【００２４】溶鋼の反転流９ｃの溶鋼流速の最大値と不
活性ガスによる溶鋼の流れ９ｄの溶鋼流速の最大値との
差を２０ｃｍ／秒以下に制御する方法は、不活性ガスの
吹き込み量を浸漬ノズルの詰まりが発生しない程度に減
らしながら、電磁力による溶鋼流動制動装置により、鋳
型内の溶鋼の流動を制動することが望ましい。もう少し
詳しく、次に説明する。The method of controlling the difference between the maximum value of the flow velocity of the molten steel in the reverse flow 9c of the molten steel and the maximum value of the flow velocity of the molten steel in the flow 9d of the molten steel due to the inert gas to 20 cm / sec or less is as follows. It is desirable to brake the flow of the molten steel in the mold by a molten steel flow braking device using electromagnetic force while reducing the immersion nozzle to a level that does not cause clogging. This will be described in more detail below.
【００２５】鋳型の短辺から浸漬ノズルの方向に向かう
溶鋼の反転流９ｃの溶鋼流速は、一般的に不活性ガスに
よる溶鋼の流れ９ｄの溶鋼流速よりも速い。そこで、溶
鋼流速の最大値の差を制御する方法として、不活性ガス
の吹き込み量を多くする方法もあるが、このときには、
凝固殻に気泡が捕捉されやすくなる。したがって、不活
性ガスの吹き込み量を浸漬ノズルの詰まりが発生しない
程度に減らしていくのが望ましいが、不活性ガスの吹き
込み量を、単に減らすだけでは、溶鋼の反転流９ｃの流
速は速いままであり、溶鋼の反転流９ｃと溶鋼の流れ９
ｄが衝突する位置で、メニスカス近傍の溶鋼の湯面は波
立ちやすくなる。そこで、不活性ガスの吹き込み量を減
らすと同時に、溶鋼の反転流９ｃの流速を溶鋼流動制動
装置により遅くするのが望ましい。The molten steel flow velocity of the reverse flow 9c of the molten steel from the short side of the mold toward the immersion nozzle is generally higher than the molten steel flow velocity of the molten steel flow 9d due to the inert gas. Therefore, as a method of controlling the difference between the maximum values of the flow rate of the molten steel, there is a method of increasing the blowing amount of the inert gas.
Air bubbles are likely to be trapped in the solidified shell. Therefore, it is desirable to reduce the blowing amount of the inert gas to such an extent that the clogging of the immersion nozzle does not occur. However, if the blowing amount of the inert gas is simply reduced, the flow rate of the reverse flow 9c of the molten steel is kept high. Yes, reverse flow 9c of molten steel and flow 9 of molten steel
At the position where d collides, the molten steel surface of the molten steel in the vicinity of the meniscus tends to undulate. Therefore, it is desirable that the flow rate of the reverse flow 9c of the molten steel be reduced by the molten steel flow braking device while the amount of the inert gas blown is reduced.
【００２６】図３は、鋳型内に設ける溶鋼流動制動装置
の例を模式的に示す図である。溶鋼流動制動装置１１と
しては、電磁ブレーキなどを用いることができる。鋳型
内の幅方向に、浸漬ノズル４を挟んで２列、高さ方向に
３段で、合計６対の溶鋼流動制動装置１１を設けた例を
示す。溶鋼流動制動装置の１対とは、図示していない
が、鋳型の相対する長辺の外側に、長辺を挟んで設けた
装置が１対である。鋳型の高さ方向に３段設ける場合に
は、上段が溶鋼のメニスカス近傍相当、中段が浸漬ノズ
ルからの吐出流近傍相当、下段が鋳型の出側近傍相当の
位置とするのが効果的である。少なくともメニスカス近
傍の１段を設けるのが望ましい。FIG. 3 is a diagram schematically showing an example of a molten steel flow braking device provided in a mold. As the molten steel flow braking device 11, an electromagnetic brake or the like can be used. An example in which a total of six pairs of molten steel flow braking devices 11 are provided in two rows across the immersion nozzle 4 and three steps in the height direction in the width direction in the mold. Although not shown, one pair of the molten steel flow braking devices is a pair of devices that are provided outside the opposite long sides of the mold with the long sides interposed therebetween. When three stages are provided in the height direction of the mold, it is effective that the upper stage corresponds to the vicinity of the meniscus of molten steel, the middle stage corresponds to the vicinity of the discharge flow from the immersion nozzle, and the lower stage corresponds to the vicinity of the exit side of the mold. . It is desirable to provide at least one stage near the meniscus.
【００２７】電磁力により鋳型内の溶鋼の流動を制動し
つつ、不活性ガスの吹き込み量は０．２〜３．０（Ｎリ
ットル／溶鋼ｔ）とするのが望ましい。It is desirable that the flow of the inert gas be 0.2 to 3.0 (N liter / t of molten steel) while damping the flow of the molten steel in the mold by the electromagnetic force.
【００２８】０．２（Ｎリットル／溶鋼ｔ）未満では、
少なすぎて浸漬ノズルが詰まりやすくなる。さらに、不
活性ガスによる鋳型内の溶鋼中の酸化物の浮上促進効果
が少なくなる。また、３．０（Ｎリットル／溶鋼ｔ）を
超えて吹き込むと、不活性ガスの気泡が凝固殻に捕捉さ
れやすくなる。さらに、鋳型内の浸漬ノズル近傍の溶鋼
の表面において、ボイリング（溶鋼表面から不活性ガス
が噴出し、溶鋼表面が泡立つ状態）が発生し、未溶融パ
ウダーの巻き込みが発生しやすい。製品の鋼板の表面性
状がとくに厳しく要求される場合には、１．０（Ｎリッ
トル／溶鋼ｔ）以下にするのがより望ましい。If it is less than 0.2 (N liter / t of molten steel),
When the amount is too small, the immersion nozzle is easily clogged. Further, the effect of promoting the floating of the oxide in the molten steel in the mold by the inert gas is reduced. In addition, when the gas is blown over 3.0 (N liters / t of molten steel), bubbles of the inert gas are easily captured by the solidified shell. Furthermore, boiling (a state in which an inert gas is ejected from the molten steel surface and the molten steel surface foams) occurs on the surface of the molten steel in the vicinity of the immersion nozzle in the mold, and the unmelted powder is likely to be entrained. When the surface properties of the steel sheet of the product are particularly strictly required, it is more preferable to set the steel sheet to 1.0 (N liter / molten steel t) or less.
【００２９】したがって、不活性ガスの吹き込み量は
０．２〜３．０（Ｎリットル／溶鋼ｔ）が望ましく、
０．２〜１．０（Ｎリットル／溶鋼ｔ）が、さらに望ま
しい。Therefore, the amount of the inert gas to be blown is desirably 0.2 to 3.0 (N liter / t of molten steel).
0.2 to 1.0 (N liter / t of molten steel) is more desirable.
【００３０】[0030]
【実施例】垂直部長さが３ｍの垂直曲げ型連続鋳造機を
用いて、断面形状が厚み２７０ｍｍ、幅１５００ｍｍ
で、炭素含有率が０．００４重量％の極低炭素鋼（アル
ミキルド鋼）のスラブを、１．５０ｍ／分の速度で鋳造
した。EXAMPLE Using a vertical bending type continuous casting machine having a vertical length of 3 m, a cross-sectional shape was 270 mm in thickness and 1500 mm in width.
A slab of ultra low carbon steel (aluminum killed steel) having a carbon content of 0.004% by weight was cast at a speed of 1.50 m / min.
【００３１】図３に示す合計６対の装置構成の電磁ブレ
ーキ装置を鋳型に設けた。また、スライディングプレー
トに、不活性ガス吹き込み用の貫通孔（径０．３ｍｍ、
孔数１０個）を埋め込んだ耐火物を設けてＡｒガスを吹
き込んだ。The mold was provided with a total of six pairs of electromagnetic brake devices as shown in FIG. In addition, a through hole (diameter 0.3 mm,
Ar gas was blown in with a refractory in which 10 holes were buried.
【００３２】鋳造速度が一定となった状態で鋳造された
鋳片から、鋳造方向に長さ１ｍの鋳片のサンプルを採取
し、鋳片の表面のピンホール性欠陥、パウダ性欠陥およ
び鋳片の表面から内部にかけての清浄度を調査した。ま
た、鋳造中に浸漬ノズルの詰まり状況を観察した。詰ま
りが発生した場合には、鋳造速度を一定に維持しようと
して浸漬ノズルに供給する溶鋼の量を制御するスライデ
ィングプレートの開度が大きくなる現象が現れるので、
その開度の変化を観察することにより、浸漬ノズルの詰
まり発生状況を判断した。A sample of a slab having a length of 1 m in the casting direction was sampled from a slab cast at a constant casting speed, and pinhole defects, powder defects, and slabs on the surface of the slab were sampled. The cleanliness from the surface to the inside was investigated. Further, the state of clogging of the immersion nozzle was observed during casting. When clogging occurs, a phenomenon occurs in which the opening of the sliding plate that controls the amount of molten steel supplied to the immersion nozzle increases in order to maintain the casting speed constant,
By observing the change in the opening, the state of clogging of the immersion nozzle was determined.
【００３３】鋳片の表面のピンホール性欠陥の調査方法
は、次のとおりである。得られた鋳片のサンプルから、
一辺が５０ｍｍの正方形の鋳片表面を含む試料を切り出
し、鋳片表面から１ｍｍ深さまで研削した。その研磨し
た表面を、光学顕微鏡にて１００倍の倍率で、１００μ
ｍ以上の穴あき状のピンホール性欠陥の個数を調査し
た。同時に、研磨前の研削したままの鋳片の表面に、未
溶融のパウダがあるかどうかを目視で調査した。ピンホ
ール性欠陥の個数の最も少なかった試験の試験結果を指
数１．０として、その他の試験結果を評価した。The method of investigating the pinhole defect on the surface of the slab is as follows. From the obtained slab sample,
A sample including a square slab surface with a side of 50 mm was cut out and ground to a depth of 1 mm from the slab surface. The polished surface was observed with an optical microscope at a magnification of 100 times, 100 μm.
The number of perforated pinhole defects of m or more was investigated. At the same time, it was visually inspected for unmelted powder on the surface of the as-ground slab before polishing. Other test results were evaluated with the test result of the test in which the number of pinhole defects was the smallest as an index of 1.0.
【００３４】鋳片の表面から内部にかけての清浄度の調
査は、次のようにして行った。鋳片の幅方向の１／４の
位置で、縦１０ｍｍ、横５０ｍｍの長方形の鋳片表面を
含む鋳片全厚の試料を採取した。この試料から、鋳片の
厚み方向に１０ｍｍの間隔で、サイコロ状の試料を切り
出した。この試料の鋳片表面を向いた断面について、Ｊ
ＩＳ Ｇ ０５５５で規定する試験方法により、光学顕
微鏡により４００倍の倍率で清浄度を調査した。もっと
も清浄度が悪かった断面の清浄度を、その鋳片の清浄度
とした。清浄度の最も良かった試験の試験結果を指数
１．０として、その他の試験結果を評価した。The cleanliness from the surface of the slab to the inside of the slab was investigated as follows. A sample of the entire thickness of the slab including the surface of a rectangular slab having a length of 10 mm and a width of 50 mm was sampled at a position 1/4 in the width direction of the slab. From this sample, dice-shaped samples were cut out at intervals of 10 mm in the thickness direction of the slab. The cross section of this sample facing the slab surface is J
According to the test method specified in IS G 0555, the cleanliness was examined with an optical microscope at a magnification of 400 times. The cleanliness of the section having the worst cleanliness was defined as the cleanliness of the slab. Other test results were evaluated, with the test result of the test with the best cleanliness being the index 1.0.
【００３５】表１に、試験条件と試験結果を示す。Table 1 shows test conditions and test results.
【００３６】[0036]
【表１】 [Table 1]
【００３７】本発明例の試験Ｎｏ．１〜Ｎｏ．３では、
本発明で規定する範囲内の溶鋼流速の最大値の差とし、
さらに望ましい範囲内のＡｒ量を吹き込み、３段の電磁
ブレーキを作用させた。試験Ｎｏ．１〜Ｎｏ．３では、
得られた鋳片の表面のピンホール性欠陥は少なく、また
鋳片の清浄度も良好であった。また、パウダ性欠陥はな
く、浸漬ノズル詰まりも発生せず、良好な結果であっ
た。Test No. of the present invention example 1 to No. In 3,
The difference between the maximum value of the molten steel flow velocity within the range specified by the present invention,
Further, an Ar amount within a desirable range was blown, and a three-stage electromagnetic brake was applied. Test No. 1 to No. In 3,
The surface of the obtained slab had few pinhole defects, and the slab had good cleanliness. In addition, there were no powdery defects, no clogging of the immersion nozzle, and good results were obtained.
【００３８】本発明例の試験Ｎｏ．４〜Ｎｏ．６では、
電磁ブレーキを２段、試験Ｎｏ．７では、電磁ブレーキ
を１段のみで試験した。また、溶鋼流速の最大値の差と
吹き込みＡｒ量の条件は、本発明で規定する範囲内また
は望ましい範囲内とした。いずれの試験も、鋳片の表面
のピンホール性欠陥指数は１．２〜１．３、鋳片の清浄
度指数は１．２〜１．３で良好であった。また、パウダ
性欠陥もなく、浸漬ノズルの詰まりも発生しなかった。Test No. of the present invention example. 4-No. In 6,
Test No. 2 with electromagnetic brake In No. 7, the electromagnetic brake was tested in only one stage. The difference between the maximum value of the molten steel flow rate and the amount of blown Ar was set within the range specified in the present invention or within a desirable range. In any of the tests, the pinhole defect index on the surface of the slab was 1.2 to 1.3, and the cleanness index of the slab was 1.2 to 1.3. In addition, there was no powder defect, and no clogging of the immersion nozzle occurred.
【００３９】比較例の試験Ｎｏ．８では、ピンホール性
欠陥指数が５．５と高く、清浄度指数も４．５と悪かっ
た。また、パウダ性欠陥も認められた。その理由は、Ａ
ｒガスの吹き込み量は望ましい範囲内であったが、電磁
ブレーキを用いなかったので、溶鋼流速の最大値の差が
３０ｃｍ／秒と速くなり、鋳型内の浸漬ノズル近傍で溶
鋼の表面が波立ちが顕著であったためである。Test No. of Comparative Example In No. 8, the pinhole defect index was as high as 5.5, and the cleanliness index was as poor as 4.5. In addition, powder defects were also observed. The reason is A
Although the amount of r gas blown was within the desired range, the difference in the maximum value of the molten steel flow velocity was as fast as 30 cm / sec because no electromagnetic brake was used, and the surface of the molten steel was wavy near the immersion nozzle in the mold. This is because it was remarkable.
【００４０】比較例の試験Ｎｏ．９では、ピンホール性
欠陥指数が８．０と高く、悪い結果であった。清浄度指
数も４．０と悪かった。パウダ性欠陥も認められた。そ
の理由は、電磁ブレーキを用いずに、Ａｒガスの吹き込
み量を、望ましい範囲外で大きくしたので、溶鋼流速の
最大値の差が２５ｃｍ／秒まで低減したが、Ａｒガス量
が多いために、鋳型内の溶鋼の表面にボイリングが発生
しためである。Test No. of Comparative Example In No. 9, the pinhole defect index was as high as 8.0, which was a bad result. The cleanliness index was also bad at 4.0. Powder defects were also observed. The reason is that the blowing amount of Ar gas was increased outside the desired range without using the electromagnetic brake, so that the difference in the maximum value of the flow rate of molten steel was reduced to 25 cm / sec. This is because boiling occurs on the surface of the molten steel in the mold.
【００４１】比較例の試験Ｎｏ．１０では、Ａｒガスの
吹き込み量を、望ましい範囲外で少なくし、かつ上部の
１段の電磁ブレーキを用いた。１段の電磁ブレーキを用
いたが、Ａｒ量が少ないこともあって、溶鋼流速の最大
値の差は３０ｃｍ／秒と速くなった。ピンホール性欠陥
指数は３．０で悪かった。また、清浄度指数が７．０と
高くなり、悪かった。Ａｒ量が少なくて、溶鋼中の酸化
物の浮上が少なかったためである。Test No. of Comparative Example In No. 10, the blowing amount of Ar gas was reduced outside the desired range, and an upper one-stage electromagnetic brake was used. Although a one-stage electromagnetic brake was used, the difference in the maximum value of the flow rate of the molten steel was as fast as 30 cm / sec because of the small amount of Ar. The pinhole defect index was bad at 3.0. Further, the cleanliness index was as high as 7.0, which was bad. This is because the amount of Ar was small and the floating of the oxide in the molten steel was small.
【００４２】[0042]
【発明の効果】本発明の方法の適用により、鋳造中に浸
漬ノズルの詰まりが発生することなく、鋳片表面にピン
ホール性欠陥やパウダ性欠陥がなく、表面性状に優れ、
かつ清浄度に優れた鋳片を得ることが可能である。According to the method of the present invention, no clogging of the immersion nozzle occurs during casting, there is no pinhole defect or powder defect on the slab surface, and the surface properties are excellent.
In addition, it is possible to obtain a slab excellent in cleanliness.
【図１】浸漬ノズル内の溶鋼中に不活性ガスを吹き込ん
だときの、鋳型内の溶鋼の流動状況を模式的に示す図で
ある。FIG. 1 is a view schematically showing a flow state of molten steel in a mold when an inert gas is blown into molten steel in an immersion nozzle.
【図２】タンディッシュの鋳型への給湯孔、浸漬ノズ
ル、不活性ガス吹き込み位置などの配置を模式的に示す
図である。FIG. 2 is a diagram schematically showing an arrangement of a hot water supply hole to a mold of a tundish, an immersion nozzle, an inert gas blowing position, and the like.
【図３】鋳型内に設ける溶鋼流動制動装置の例を模式的
に示す図である。FIG. 3 is a diagram schematically illustrating an example of a molten steel flow braking device provided in a mold.
１： タンディッシュ ２：上ノズル耐火
物 ３： スライディングプレート ３ａ：不活性ガス吹
き込み口 ４： 浸漬ノズル ５：吐出孔 ６： 鋳型 ７：メニスカス ８： パウダー ８ａ：未溶融パウダ ８
ｂ：溶融パウダ ９： 溶鋼の吐出流 ９ａ：溶鋼の上昇流 ９
ｂ：溶鋼の下降流 ９ｃ：溶鋼の反転流 ９ｄ：不活性ガスによる溶鋼
の流れ １０： 凝固殻 １１：溶鋼流動制動装置 １２： 溶鋼 １３：気泡1: Tundish 2: Upper nozzle refractory 3: Sliding plate 3a: Inert gas injection port 4: Immersion nozzle 5: Discharge hole 6: Mold 7: Meniscus 8: Powder 8a: Unmelted powder 8
b: molten powder 9: discharge flow of molten steel 9a: ascending flow of molten steel 9
b: downflow of molten steel 9c: reverse flow of molten steel 9d: flow of molten steel by inert gas 10: solidified shell 11: molten steel flow braking device 12: molten steel 13: air bubble
───────────────────────────────────────────────────── フロントページの続き (72)発明者 深川 信 大阪府大阪市中央区北浜４丁目５番33号住 友金属工業株式会社内 Ｆターム(参考） 4E004 AA09 HA01 HA02 MB11 MB20 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shin Fukagawa F-term (reference) 4E004 AA09 HA01 HA02 MB11 MB20 in 4-33 Kitahama, Chuo-ku, Osaka-shi, Osaka
Claims (2)
える浸漬ノズルを用いるとともに、タンディッシュの鋳
型への給湯孔から上記浸漬ノズルの吐出孔の間で、溶鋼
中に不活性ガスを吹き込みつつ連続鋳造する方法であっ
て、鋳型内の溶鋼のメニスカス近傍での溶鋼流速を、吹
き込まれた上記不活性ガスにより発生する浸漬ノズル近
傍から鋳型の短辺に向かう流れの最大値と鋳型の短辺側
から浸漬ノズルに向かう流れの最大値との差が２０ｃｍ
／秒以下となるように制御することを特徴とする鋼の連
続鋳造方法。An immersion nozzle provided with a discharge hole whose discharge flow is directed to the short side of the mold, and an inert gas is introduced into the molten steel from a hot water supply hole to the mold of the tundish to a discharge hole of the immersion nozzle. Is a method of continuous casting while blowing the molten steel, wherein the molten steel flow velocity near the meniscus of the molten steel in the mold, the maximum value of the flow from the vicinity of the immersion nozzle generated by the injected inert gas to the short side of the mold and the mold The difference from the maximum value of the flow from the short side to the immersion nozzle is 20 cm
A continuous casting method for steel, characterized in that the control is performed so as to be not more than / sec.
磁力による溶鋼流動制動装置により、鋳型内の溶鋼の流
動を制動しつつ、不活性ガスの吹き込み量０．２〜３．
０（Ｎリットル／溶鋼ｔ）の範囲内で鋳造することを特
徴とする請求項１に記載の鋼の連続鋳造方法。2. An inert gas blowing amount of 0.2 to 3. while the flow of molten steel in the mold is braked by a molten steel flow braking device by an electromagnetic force provided outside the long side of the mold with the mold interposed therebetween.
The continuous casting method for steel according to claim 1, wherein the casting is performed within a range of 0 (N liter / t molten steel).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30429498A JP3385982B2 (en) | 1998-10-26 | 1998-10-26 | Continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30429498A JP3385982B2 (en) | 1998-10-26 | 1998-10-26 | Continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000126850A true JP2000126850A (en) | 2000-05-09 |
| JP3385982B2 JP3385982B2 (en) | 2003-03-10 |
Family
ID=17931311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30429498A Expired - Fee Related JP3385982B2 (en) | 1998-10-26 | 1998-10-26 | Continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3385982B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109047695A (en) * | 2018-08-01 | 2018-12-21 | 东北大学 | A kind of immersed nozzle for continuous casting mould Argon control method |
| CN111872338A (en) * | 2020-07-10 | 2020-11-03 | 上海大学 | Method for judging flow field form of slab crystallizer |
| CN113426972A (en) * | 2021-06-04 | 2021-09-24 | 北京首钢股份有限公司 | Crystallizer casting powder control method, device, equipment and storage medium |
| CN113500173A (en) * | 2021-06-11 | 2021-10-15 | 上海大学 | Control method for molten steel flow field form of medium-section slab crystallizer |
-
1998
- 1998-10-26 JP JP30429498A patent/JP3385982B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109047695A (en) * | 2018-08-01 | 2018-12-21 | 东北大学 | A kind of immersed nozzle for continuous casting mould Argon control method |
| CN109047695B (en) * | 2018-08-01 | 2019-06-18 | 东北大学 | A kind of continuous casting mold submerged nozzle argon blowing control method |
| CN111872338A (en) * | 2020-07-10 | 2020-11-03 | 上海大学 | Method for judging flow field form of slab crystallizer |
| CN111872338B (en) * | 2020-07-10 | 2021-11-05 | 上海大学 | Method for judging flow field form of slab crystallizer |
| CN113426972A (en) * | 2021-06-04 | 2021-09-24 | 北京首钢股份有限公司 | Crystallizer casting powder control method, device, equipment and storage medium |
| CN113500173A (en) * | 2021-06-11 | 2021-10-15 | 上海大学 | Control method for molten steel flow field form of medium-section slab crystallizer |
| CN113500173B (en) * | 2021-06-11 | 2022-10-11 | 上海大学 | Control method for molten steel flow field form of medium-section slab crystallizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3385982B2 (en) | 2003-03-10 |
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