JP3152276B2 - Continuous casting method of SUS304 stainless steel - Google Patents
Continuous casting method of SUS304 stainless steelInfo
- Publication number
- JP3152276B2 JP3152276B2 JP33644094A JP33644094A JP3152276B2 JP 3152276 B2 JP3152276 B2 JP 3152276B2 JP 33644094 A JP33644094 A JP 33644094A JP 33644094 A JP33644094 A JP 33644094A JP 3152276 B2 JP3152276 B2 JP 3152276B2
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- mold
- molten steel
- sec
- stainless steel
- flow velocity
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Description
【0001】[0001]
【産業上の利用分野】この発明は、SUS304ステン
レス鋼を連続鋳造する場合における鋳片の表面性状を、
鋳型内SUS304ステンレス溶鋼の電磁撹拌によって
改善するSUS304ステンレス鋼の連続鋳造方法に関
する。BACKGROUND OF THE INVENTION The present invention relates to a method for continuously casting SUS304 stainless steel.
The present invention relates to a continuous casting method of SUS304 stainless steel, which is improved by electromagnetic stirring of SUS304 stainless steel molten steel in a mold.
【0002】[0002]
【従来の技術】スラブの連続鋳造は、タンディッシュか
ら浸漬ノズルを介して鋳型内に注入された溶鋼を、鋳型
壁により周囲から冷却し、凝固シェルを形成発達させつ
つ引抜いて行われる。この際鋳型内では、タンディッシ
ュから注入された溶鋼は浸漬ノズルの吐出孔からスラブ
幅方向に流出し、この溶鋼流は鋳型の狭面部に衝突して
下降流が生じ、この下降流が溶鋼流の主流となって溶鋼
内に深く浸入する。このような連続鋳造方法によると、
下降流に巻込まれた介在物やアルゴンガスなどの気泡
が、凝固シェル界面に捕捉され、介在物集積帯となって
圧延時に欠陥として露出し、問題となることが知られて
いる。2. Description of the Related Art Continuous casting of a slab is carried out by cooling molten steel poured into a mold from a tundish through a dip nozzle, cooling from the surroundings by a mold wall, and drawing the molten steel while forming and developing a solidified shell. At this time, in the mold, the molten steel injected from the tundish flows out from the discharge hole of the immersion nozzle in the width direction of the slab, and the molten steel flow collides with the narrow surface portion of the mold to generate a downward flow. And penetrates deeply into molten steel. According to such a continuous casting method,
It is known that inclusions and bubbles such as argon gas entrained in the downward flow are trapped at the interface of the solidified shell, become inclusion inclusion zones, and are exposed as defects during rolling, causing a problem.
【0003】特に最近では、連続鋳造速度の高速化や連
続鋳造と圧延工程の直結化が積極的に進められている
が、前記鋳造欠陥の発生はそれらを実施するうえで大き
な障害となっていた。ステンレス鋼片の介在物やピンホ
ールに起因するヘゲ疵は、鋳型内凝固シェル界面にそれ
らが捕捉されて発生する製鋼欠陥であり、図6に示すと
おり、鋳型内溶鋼の過熱度ΔT(鋳型内溶鋼温度−液相
線温度)が高いほど減少する傾向にある。鋳型内溶鋼の
過熱度ΔTを高くするには、図7に示すとおり、発熱性
モールドパウダーの使用や、図8に示すとおり、浸漬ノ
ズルの吐出角度を上向きにする方法が知られている。[0003] In particular, recently, the continuous casting speed has been increased and the continuous casting and the rolling process have been directly linked to each other. However, the occurrence of the casting defects has been a major obstacle in implementing them. . The barbed flaws caused by inclusions and pinholes in the stainless steel slab are steelmaking defects generated by trapping them at the solidified shell interface in the mold. As shown in FIG. 6, the degree of superheat ΔT of the molten steel in the mold (mold It tends to decrease as the (internal molten steel temperature−liquidus temperature) increases. In order to increase the degree of superheat ΔT of the molten steel in the mold, it is known to use exothermic mold powder as shown in FIG. 7 or to raise the discharge angle of the immersion nozzle as shown in FIG.
【0004】一方、圧延製品のヘゲ疵を零にするために
は、図6に示すとおり、鋳型内溶鋼の過熱度ΔT≧10
℃を確保することが必要であり、前記発熱性モールドパ
ウダーの使用や、浸漬ノズルの吐出角度の上向き化によ
る上部溶鋼の昇温だけでは、操業上のバラツキがあり不
十分である。また、吐出角度上向き30°の浸漬ノズル
の場合は、溶融パウダーの巻込みが発生し、かえって表
面疵発生を引起こすこととなる。[0004] On the other hand, in order to eliminate the burrs on the rolled product, as shown in FIG.
It is necessary to maintain a temperature of ℃ ° C., and the use of the exothermic mold powder or the increase in the temperature of the upper molten steel due to the upward discharge angle of the immersion nozzle alone is not sufficient because of variations in operation. In the case of an immersion nozzle having a discharge angle upward of 30 °, the molten powder is entrained, which causes surface flaws.
【0005】鋳型内溶鋼の過熱度ΔT<10℃の条件に
おいてもヘゲ疵発生率を零に抑えるためには、モールド
内溶鋼の電磁撹拌が有効である。すなわち、鋳型内溶鋼
に電磁撹拌を付与して鋳型内で成長しつつある凝固シェ
ル界面に溶鋼流動を適切に与えると、鋳片表層部に発生
するピンホールや鋳片表層部に捕捉される介在物は、溶
鋼の流動によって洗い流されて低減することが知られて
いる。しかし、鋳型内溶鋼の電磁撹拌は、凝固シェル界
面の洗浄効果がある反面、撹拌が強すぎると溶融パウダ
ーの巻込みが発生し易いという問題がある。[0005] Even under the condition of superheat ΔT <10 ° C of the molten steel in the mold, electromagnetic stirring of the molten steel in the mold is effective to suppress the occurrence rate of scabs. In other words, if the molten steel in the mold is subjected to electromagnetic stirring to properly apply the molten steel flow to the solidified shell interface growing in the mold, pinholes generated in the surface layer of the slab or interposition captured by the surface layer of the slab Objects are known to be washed away and reduced by the flow of molten steel. However, electromagnetic stirring of the molten steel in the mold has the effect of cleaning the interface of the solidified shell, but there is a problem that if the stirring is too strong, entrainment of the molten powder is likely to occur.
【0006】電磁撹拌による鋳片品質の改善方法として
は、数多くの提案が行われている。例えば、鋳型の少な
くとも一方の長辺側のメニスカス近傍に2つの電磁撹拌
装置を対向して設置し、電磁撹拌によって鋳型内溶鋼に
幅方向の中心に向かう流れを付与し、浸漬ノズルからの
溶鋼流の鋳型内溶鋼への浸透深さを浅くして、良好な品
質の鋳片を製造する方法(特開昭57−75270号公
報)、メニスカス近傍に上下2段に電磁撹拌装置を設置
し、鋳型内溶鋼に上下方向の回転流を付与し、等晶軸の
生成を十分に行わしめ、優れた品質の鋳片を製造する方
法(特開昭57−75272号公報)、高さ方向に設定
位置可変の電磁撹拌装置を備えた鋳型を使用し、メニス
カスから該装置のモーターコア中心までの距離hを、下
式(1)の関係が実質的に満足するように定め、メニス
カスから2×hの位置における鋳型内溶鋼の水平方向の
流速が15〜40cm/secの範囲となるように、該
電磁撹拌装置によって鋳型内溶鋼に水平旋回流を付与す
る方法(特開昭63−60056号公報)。 h=1/2・V・(D/K)2 (1) ただし、h:メニスカスからモーターコア中心までの鋳
造方向への距離(m)。 K:凝固定数(mm/min1/2)。 D:メニスカスから2hの距離における凝固シェル厚
(mm)であり、 10〜30mmの範囲の数値とする。Many proposals have been made for improving the quality of slabs by electromagnetic stirring. For example, two electromagnetic stirring devices are installed facing each other in the vicinity of the meniscus on at least one long side of the mold, and a flow toward the center in the width direction is given to the molten steel in the mold by electromagnetic stirring, and the molten steel flow from the immersion nozzle (Japanese Patent Application Laid-Open No. 57-75270) by reducing the depth of penetration of molten steel into the molten steel in a mold (Japanese Unexamined Patent Publication No. 57-75270). A method of producing a slab of excellent quality by imparting a vertical rotating flow to the inner molten steel to sufficiently generate an isotropic crystal axis (Japanese Patent Application Laid-Open No. 57-75272), at a set position in the height direction. Using a mold equipped with a variable electromagnetic stirrer, the distance h from the meniscus to the center of the motor core of the device was determined such that the relationship of the following equation (1) was substantially satisfied: Of molten steel in mold at position As the flow rate is in the range of 15~40cm / sec, a method of imparting horizontal swirling flow in the molten steel in the mold by the electromagnetic stirring apparatus (JP-A-63-60056). h = 1 / · V · (D / K) 2 (1) where h: distance (m) from the meniscus to the center of the motor core in the casting direction. K: coagulation constant (mm / min 1/2 ). D: Solidified shell thickness (mm) at a distance of 2 h from the meniscus, and a numerical value in the range of 10 to 30 mm.
【0007】[0007]
【発明が解決しようとする課題】上記特開昭57−75
270号公報、特開昭57−75272号公報に開示の
方法は、鋳片内に等晶軸を良好に形成させるためのもの
で、鋳片の表面性状を改善するものではない。また、特
開昭63−60056号公報に開示の方法は、メニスカ
スから2×hの位置における鋳型内溶鋼の水平方向の流
速が15〜40cm/secの範囲となるように、該電
磁撹拌装置によって鋳型内溶鋼に水平旋回流を付与する
こととなっている。しかし、電磁撹拌装置の出力は、一
般に電流値で代表されるが、同じ電流値であっても鋳型
幅によって流速が異なり、流速を上記範囲内に制御する
ことは困難である。Problems to be Solved by the Invention
The methods disclosed in Japanese Patent Publication No. 270 and Japanese Patent Application Laid-Open No. 57-75272 are intended to favorably form equiaxed axes in a slab, and do not improve the surface properties of the slab. Further, the method disclosed in Japanese Patent Application Laid-Open No. 63-60056 discloses a method in which the magnetic stirrer is used so that the horizontal flow rate of molten steel in a mold at a position 2 × h from the meniscus is in a range of 15 to 40 cm / sec. A horizontal swirling flow is to be applied to the molten steel in the mold. However, the output of the electromagnetic stirrer is generally represented by a current value. However, even at the same current value, the flow speed varies depending on the mold width, and it is difficult to control the flow speed within the above range.
【0008】この発明の目的は、上記従来技術の欠点を
解消し、SUS304ステンレス溶鋼の連続鋳造におけ
る鋳片の表層部欠陥を防止し、圧延後のSUS304ス
テンレス鋼板のヘゲ疵発生を皆無とできるSUS304
ステンレス鋼の連続鋳造方法を提供することにある。An object of the present invention is to solve the drawbacks of the prior art, to prevent the surface portion defect of slab in the continuous casting of SUS304 stainless molten steel, it can be completely eliminated the scab flaw occurrence of SUS304 stainless steel plate after rolling SUS304
It is to provide a continuous casting method of stainless steel.
【0009】[0009]
【課題を解決するための手段】本発明者らは、上記目的
を達成すべく鋭意試験研究を重ねた。その結果、連続鋳
造における電磁撹拌の出力は、一般に電流値で代表され
るが、同じ電流値であってもスラブ幅が広いほど、加速
されるため撹拌強さが大きくなる。したがって、スラブ
幅毎に鋳型内溶鋼の水平旋回流の流速を測定し、ヘゲ疵
発生との関係を調査してスラブ幅毎に適正な流速範囲が
存在することを究明し、この発明に到達した。Means for Solving the Problems The present inventors have intensively studied and studied to achieve the above object. As a result, the output of electromagnetic stirring in continuous casting is generally represented by a current value. However, even with the same current value, the wider the slab width, the faster the slab is accelerated and the higher the stirring intensity. Therefore, the flow velocity of the horizontal swirling flow of the molten steel in the mold was measured for each slab width, the relationship with the occurrence of scabs was investigated, and it was determined that an appropriate flow velocity range exists for each slab width. did.
【0010】すなわちこの発明は、鋳型内SUS304
ステンレス溶鋼を電磁撹拌しつつ連続鋳造する方法にお
いて、鋳型内SUS304ステンレス溶鋼の水平旋回流
の流速V(cm/sec)と鋳型の広面幅W(cm)の
積V・Wが、103以上104(cm2/sec)以下と
なるように電磁撹拌装置への印加電流を調整し、鋳型内
SUS304ステンレス溶鋼の流速Vを制御することを
特徴とするSUS304ステンレス鋼の連続鋳造方法で
ある。[0010] That is, the present invention relates to SUS304 in a mold.
In the method of continuously casting molten stainless steel with electromagnetic stirring, the product V · W of the flow velocity V (cm / sec) of the horizontal swirling flow of the SUS304 stainless molten steel in the mold and the wide surface width W (cm) of the mold is 10 3 or more and 10 3 or more. Adjust the applied current to the electromagnetic stirrer so that it is 4 (cm 2 / sec) or less, and
A continuous casting method of SUS304 stainless steel and controlling the flow rate V of SUS304 stainless molten steel.
【0011】[0011]
【作用】この発明においては、鋳型内SUS304ステ
ンレス溶鋼の水平旋回流の流速V(cm/sec)と鋳
型の広面幅W(cm)の積V・Wが、103以上10
4(cm2/sec)以下となるように電磁撹拌装置への
印加電流を調整し、鋳型内SUS304ステンレス溶鋼
の水平旋回流の流速Vを制御することによって、鋳型内
溶鋼流による凝固シェル界面に捕捉された介在物ならび
に気泡の洗浄除去効果が十分に発揮されると共に、溶融
パウダーの巻込みが防止でき、鋳片表層部への介在物な
らびにピンホールの集積に起因するヘゲ疵発生を皆無と
することができる。According to the present invention, the product V · W of the flow velocity V (cm / sec) of the horizontal swirling flow of the SUS304 stainless steel molten steel in the mold and the wide surface width W (cm) of the mold is 10 3 or more.
By controlling the current applied to the electromagnetic stirrer so as to be 4 (cm 2 / sec) or less and controlling the flow velocity V of the horizontal swirling flow of the SUS304 stainless steel melt in the mold, the solidified shell interface due to the flow of the molten steel in the mold is formed. The effect of washing and removing trapped inclusions and air bubbles is sufficiently exhibited, and the incorporation of molten powder can be prevented, and there is no occurrence of barbed flaws due to accumulation of inclusions and pinholes on the surface layer of the slab. It can be.
【0012】この発明において使用する鋳型内SUS3
04ステンレス溶鋼の水平旋回流の流速V(cm/se
c)は、図5に示すとおり、鋳型の狭面から200mm
中央寄りで、かつ広面から20mm離れた最も流速の早
い位置に煉瓦小片を浮かべ、高速度カメラで撮影して求
めたものを用いた。この発明において鋳型の広面幅W
(cm)と鋳型内溶鋼流速V(cm/sec)の積W・
Vを、103以上104(cm2/sec)以下としたの
は、鋳型の広面幅W(cm)と鋳型内溶鋼流速V(cm
/sec)の積W・Vが103(cm2/sec)未満で
は、電磁撹拌装置の撹拌力が弱すぎて凝固シェル界面か
らの介在物ならびに気泡の洗浄除去が十分でなくヘゲ疵
が発生し、また、逆に104(cm2/sec)を超える
と電磁撹拌装置の撹拌力が強すぎて溶融パウダーの巻込
みに起因するヘゲ疵が発生するからである。 SUS3 in the mold used in the present invention
04 Stainless steel molten steel horizontal swirl flow velocity V (cm / sec)
c) is 200 mm from the narrow surface of the mold, as shown in FIG.
A brick piece was floated at a position near the center and 20 mm away from the wide surface and at the highest flow velocity, and an image obtained by photographing with a high-speed camera was used. In the present invention, the wide surface width W of the mold
(Cm) and the product W of the molten steel flow velocity V (cm / sec) in the mold.
The reason why V was set to 10 3 or more and 10 4 (cm 2 / sec) or less was that the wide surface width W (cm) of the mold and the flow velocity V (cm
/ Sec) is less than 10 3 (cm 2 / sec), the stirring power of the electromagnetic stirrer is too weak to sufficiently remove and remove inclusions and air bubbles from the solidified shell interface, resulting in scorching. On the other hand, if it exceeds 10 4 (cm 2 / sec), the stirring power of the electromagnetic stirrer is too strong, and scabs are generated due to the entrainment of the molten powder.
【0013】[0013]
【実施例】実施例1 厚さ20cm、幅100cm、125cm、150cm
のスラブ鋳型を有する湾曲半径15mの湾曲型スラブ連
続鋳造機を用い、この鋳型の広面に電磁撹拌装置を設置
し、モールドパウダーとして発熱パウダーを使用し、吐
出角度上向き15°の浸漬ノズルから過熱度ΔT<10
℃のSUS304ステンレス溶鋼を注入して連続鋳造す
るに際し、電磁撹拌装置への印加電流を調整して鋳型内
SUS304ステンレス溶鋼の水平旋回流の流速Vを2
〜250cm/secの範囲で変化させて引抜き速度
0.8m/minで連続鋳造し、得られたSUS304
ステンレス鋼片を熱間圧延、冷間圧延してSUS304
ステンレス鋼板となし、ヘゲ疵発生率を調査した。その
結果を図1〜図3に示す。EXAMPLES Example 1 Thickness 20 cm, width 100 cm, 125 cm, 150 cm
Using a curved slab continuous casting machine with a curved radius of 15 m having a slab mold, an electromagnetic stirrer was installed on the wide surface of this mold, and a heating powder was used as a mold powder. ΔT <10
Upon continuous casting by injecting SUS30 4 stainless molten steel ° C., by adjusting the applied current to the electromagnetic stirring device in the mold
The flow velocity V of the horizontal swirling flow of SUS304 stainless steel molten steel is 2
SUS304 obtained by continuous casting at a drawing speed of 0.8 m / min while changing in the range of ~ 250 cm / sec.
Hot rolled and cold rolled stainless steel SUS304
A stainless steel plate was used, and the occurrence rate of bark flaws was investigated. The results are shown in FIGS.
【0014】図1に示すとおり、鋳型幅が100cmの
場合は、流速Vが10cm/sec未満と撹拌力が弱い
と、撹拌効果が弱すぎて凝固シェル界面からの介在物な
らびに気泡の洗浄除去が十分でなく、ヘゲ疵が発生して
いる。また、流速Vが100cm/secを超えると、
撹拌力が強すぎて溶融パウダーの巻込みによってヘゲ疵
が発生している。これに対し、流速Vが10〜100c
m/secの場合は、いずれもヘゲ疵の発生は皆無であ
り、撹拌効果により凝固シェル界面からの介在物ならび
に気泡の洗浄除去が十分で、しかも、溶融パウダーの巻
込みもなく、鋳型幅が100cmにおける適正な領域で
あるということができる。As shown in FIG. 1, when the mold width is 100 cm, if the flow velocity V is less than 10 cm / sec and the stirring power is weak, the stirring effect is too weak to wash and remove inclusions and bubbles from the solidified shell interface. Not enough, and scabs are generated. When the flow velocity V exceeds 100 cm / sec,
The agitation force is too strong, and the swarf flaw is generated by the entrainment of the molten powder. On the other hand, when the flow velocity V is 10 to 100 c
In the case of m / sec, there is no generation of barbed flaws in all cases, the agitation effect sufficiently removes inclusions and air bubbles from the interface of the solidified shell, and furthermore, there is no entrainment of molten powder, and the mold width is reduced. Is an appropriate area at 100 cm.
【0015】図2に示すとおり、鋳型幅が125cmの
場合は、流速Vが7cm/sec未満と撹拌力が弱い場
合は、撹拌効果が弱すぎて凝固シェル界面からの介在物
ならびに気泡の洗浄除去が十分でなく、ヘゲ疵が発生し
ている。また、流速Vが70cm/secを超えると、
撹拌力が強すぎて溶融パウダーの巻込みによってヘゲ疵
が発生している。これに対し、流速Vが7〜70cm/
secの場合は、いずれもヘゲ疵の発生は皆無であり、
撹拌効果により凝固シェル界面からの介在物ならびに気
泡の洗浄除去が十分で、しかも、溶融パウダーの巻込み
もなく、鋳型幅が125cmにおける適正な領域である
ということができる。As shown in FIG. 2, when the mold width is 125 cm, the flow velocity V is less than 7 cm / sec. When the stirring power is weak, the stirring effect is too weak to wash out and remove inclusions and bubbles from the solidified shell interface. Is not enough, and scabs are generated. When the flow velocity V exceeds 70 cm / sec,
The agitation force is too strong, and the swarf flaw is generated by the entrainment of the molten powder. On the other hand, the flow velocity V is 7 to 70 cm /
In the case of sec, there is no occurrence of barbed flaws in any case,
It can be said that the agitation effect sufficiently removes inclusions and bubbles from the interface of the solidified shell, removes entrainment of the molten powder, and is an appropriate region with a mold width of 125 cm.
【0016】図3に示すとおり、鋳型幅が150cmの
場合は、流速Vが6cm/sec未満の撹拌力が弱い場
合は、撹拌効果が弱すぎて凝固シェル界面からの介在物
ならびに気泡の洗浄除去が十分でなく、ヘゲ疵が発生し
ている。また、流速Vが55cm/secを超えると、
撹拌力が強すぎて溶融パウダーの巻込みによってヘゲ疵
が発生している。これに対し、流速Vが6〜55cm/
secの場合は、いずれもヘゲ疵の発生は皆無であり、
撹拌効果により凝固シェル界面からの介在物ならびに気
泡の洗浄除去が十分で、しかも、溶融パウダーの巻込み
もなく、鋳型幅が150cmにおける適正な領域である
ということができる。As shown in FIG. 3, when the mold width is 150 cm, when the flow velocity V is less than 6 cm / sec, when the stirring power is weak, the stirring effect is too weak to remove inclusions and bubbles from the solidified shell interface. Is not enough, and scabs are generated. When the flow velocity V exceeds 55 cm / sec,
The agitation force is too strong, and the swarf flaw is generated by the entrainment of the molten powder. On the other hand, the flow velocity V is 6 to 55 cm /
In the case of sec, there is no occurrence of barbed flaws in any case,
It can be said that the agitation effect is sufficient to wash and remove inclusions and air bubbles from the solidified shell interface, and that there is no entrainment of the molten powder, and that the mold width is an appropriate region at 150 cm.
【0017】前記図1〜図3の調査結果について、鋳型
幅W(cm)と鋳型内SUS304ステンレス溶鋼の水
平旋回流の流速V(cm/sec)の積W・V(cm2
/sec)とヘゲ疵発生状況の関係を整理して示すと、
図4に示すとおりであった。すなわち、図4に示すとお
り、鋳型幅W(cm)と鋳型内SUS304ステンレス
溶鋼の水平旋回流の流速V(cm/sec)の積W・V
が103〜104(cm2/sec)となるよう電磁撹拌
装置への印加電流を調整して鋳型内SUS304ステン
レス溶鋼の水平旋回流の流速Vを制御することによっ
て、ヘゲ疵の発生を皆無とすることが可能であるといえ
る。1 to 3, the product W · V (cm 2 ) of the mold width W (cm) and the flow velocity V (cm / sec) of the horizontal swirling flow of the SUS304 stainless steel melt in the mold.
/ Sec) and the relationship between the occurrence of barbed flaws are summarized and shown as follows:
As shown in FIG. That is, as shown in FIG. 4, the product W · V of the mold width W (cm) and the flow velocity V (cm / sec) of the horizontal swirling flow of the SUS304 stainless steel melt in the mold.
By controlling the current applied to the electromagnetic stirrer so that the flow rate becomes 10 3 to 10 4 (cm 2 / sec), and controlling the flow velocity V of the horizontal swirling flow of the SUS304 stainless steel molten steel in the mold, the occurrence of barbed flaws is reduced. It can be said that it is possible to have none.
【0018】実施例2 厚さ20cm、幅100cm、125cm、150cm
のスラブ鋳型を有する湾曲半径15mの湾曲型スラブ連
続鋳造機を用い、この鋳型の広面に電磁撹拌装置を設置
し、モールドパウダーとして発熱パウダーを使用し、吐
出角度上向き15°の浸漬ノズルから過熱度ΔT<10
℃のSUS304ステンレス溶鋼を注入して連続鋳造す
るに際し、電磁撹拌装置への印加電流を調整して鋳型内
SUS304ステンレス溶鋼の水平旋回流の流速Vを制
御し、鋳型幅Wと流速Vとの積W・Vを103以上104
(cm2/sec)以下に制御し、引抜き速度0.8m
/minで連続鋳造し、得られたSUS304ステンレ
ス鋼片を熱間圧延、冷間圧延してSUS304ステンレ
ス鋼板となし、ヘゲ疵発生率を調査した。その結果、冷
間圧延後のSUS304ステンレス鋼板のヘゲ疵の発生
は、皆無であった。Example 2 Thickness 20 cm, width 100 cm, 125 cm, 150 cm
Using a curved slab continuous casting machine with a curved radius of 15 m having a slab mold, an electromagnetic stirrer was installed on the wide surface of this mold, and a heating powder was used as a mold powder. ΔT <10
Upon continuous casting by injecting SUS30 4 stainless molten steel ° C., by adjusting the applied current to the electromagnetic stirring device in the mold
By controlling the flow velocity V of the horizontal swirling flow of the SUS304 stainless steel molten steel, the product W · V of the mold width W and the flow velocity V should be 10 3 or more and 10 4 or more.
(Cm 2 / sec) or less and the drawing speed is 0.8 m
/ Min, and the obtained SUS304 stainless steel slab was hot-rolled and cold-rolled to form a SUS304 stainless steel plate, and the occurrence of barge defects was investigated. As a result, no burrs were generated on the SUS304 stainless steel sheet after cold rolling.
【0019】[0019]
【発明の効果】以上述べたとおり、この発明方法によれ
ば、鋳型幅に応じて電磁撹拌装置への印加電流を調整
し、鋳型内SUS304ステンレス溶鋼の水平旋回流の
流速Vと鋳型幅Wの積V・Wを103以上104(cm2
/sec)以下に制御することによって、SUS304
ステンレス鋳片の表層部欠陥が防止でき、ヘゲ疵発生率
が皆無となって製品歩留を向上することができる。As described above, according to the method of the present invention, the current applied to the electromagnetic stirring device is adjusted according to the width of the mold, and the flow velocity V of the horizontal swirling flow of the SUS304 stainless steel molten steel in the mold and the width W of the mold width W are adjusted. The product V · W should be 10 3 or more and 10 4 (cm 2
/ Sec) by controlling SUS304
Defects in the surface layer of the stainless steel slab can be prevented, and there is no occurrence of barbed flaws, so that the product yield can be improved.
【図1】実施例1における鋳型の広面幅100cmの場
合の鋳型内流速Vとヘゲ疵発生率との関係を示す片対数
グラフである。FIG. 1 is a semilogarithmic graph showing the relationship between the flow velocity V in a mold and the occurrence rate of barbed flaws when the width of a mold is 100 cm in Example 1;
【図2】実施例1における鋳型の広面幅125cmの場
合の鋳型内流速V(cm/sec)とヘゲ疵発生率との
関係を示す片対数グラフである。FIG. 2 is a semilogarithmic graph showing the relationship between the flow velocity V (cm / sec) in the mold and the occurrence rate of barbed flaws when the wide surface width of the mold is 125 cm in Example 1.
【図3】実施例1における鋳型の広面幅150cmの場
合の鋳型内流速V(cm/sec)とヘゲ疵発生率との
関係を示す片対数グラフである。FIG. 3 is a semilogarithmic graph showing the relationship between the flow velocity in the mold V (cm / sec) and the rate of occurrence of barbed flaws when the wide surface width of the mold is 150 cm in Example 1.
【図4】鋳型の広面幅と鋳型の広面幅と鋳型内流速との
積W・V(cm2/sec)とヘゲ疵発生率との関係を
示す片対数グラフである。FIG. 4 is a semilogarithmic graph showing the relationship between the wide surface width of the mold, the product W · V (cm 2 / sec) of the wide surface width of the mold and the flow velocity in the mold, and the occurrence rate of barbed flaws.
【図5】この発明の鋳型内流速V(cm/sec)の測
定位置の説明図である。FIG. 5 is an explanatory diagram of a measurement position of a flow velocity V (cm / sec) in a mold according to the present invention.
【図6】鋳型内溶鋼過熱度ΔTとヘゲ疵発生率との関係
を示すグラフである。FIG. 6 is a graph showing the relationship between the degree of superheat ΔT of molten steel in a mold and the rate of occurrence of barbed flaws.
【図7】パウダー種類とタンディッシュ内溶鋼過熱度Δ
Tと鋳型内溶鋼過熱度ΔTとの関係を示すグラフであ
る。Fig. 7 Powder type and degree of superheat Δ of molten steel in tundish
4 is a graph showing the relationship between T and the degree of superheat ΔT of molten steel in a mold.
【図8】浸漬ノズルの吐出角とタンディッシュ内溶鋼過
熱度ΔTと鋳型内溶鋼過熱度ΔTとの関係を示すグラフ
である。FIG. 8 is a graph showing a relationship between a discharge angle of a submerged nozzle, a superheat degree ΔT of molten steel in a tundish, and a superheat degree ΔT of molten steel in a mold.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−60056(JP,A) 特開 昭59−33060(JP,A) 特開 平8−52545(JP,A) 特開 昭59−104258(JP,A) 特開 昭57−75272(JP,A) 特開 昭57−75270(JP,A) 特開 平7−290214(JP,A) (58)調査した分野(Int.Cl.7,DB名) B22D 11/115 B22D 11/00 B22D 11/04 311 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-60056 (JP, A) JP-A-59-33060 (JP, A) JP-A-8-52545 (JP, A) JP-A-59-525 104258 (JP, A) JP-A-57-75272 (JP, A) JP-A-57-75270 (JP, A) JP-A-7-290214 (JP, A) (58) Fields investigated (Int. 7 , DB name) B22D 11/115 B22D 11/00 B22D 11/04 311
Claims (1)
磁撹拌しつつ連続鋳造する方法において、鋳型内SUS
304ステンレス溶鋼の水平旋回流の流速V(cm/s
ec)と鋳型の広面幅W(cm)の積V・Wが、103
以上104(cm2/sec)以下となるように電磁撹拌
装置への印加電流を調整し、鋳型内SUS304ステン
レス溶鋼の流速Vを制御することを特徴とするSUS3
04ステンレス鋼の連続鋳造方法。1. A template in SUS304 stainless molten steel in a method of continuous casting with electromagnetic stirring in the mold SUS
Flow velocity V (cm / s) of horizontal swirling flow of 304 stainless molten steel
ec) and the wide surface width W (cm) of the mold, V · W, is 10 3
SUS3 characterized in that the current applied to the electromagnetic stirrer is adjusted so as to be 10 4 (cm 2 / sec) or less and the flow velocity V of the SUS304 stainless steel molten steel in the mold is controlled.
04 Stainless steel continuous casting method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33644094A JP3152276B2 (en) | 1994-12-21 | 1994-12-21 | Continuous casting method of SUS304 stainless steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33644094A JP3152276B2 (en) | 1994-12-21 | 1994-12-21 | Continuous casting method of SUS304 stainless steel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08174164A JPH08174164A (en) | 1996-07-09 |
JP3152276B2 true JP3152276B2 (en) | 2001-04-03 |
Family
ID=18299165
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP33644094A Expired - Lifetime JP3152276B2 (en) | 1994-12-21 | 1994-12-21 | Continuous casting method of SUS304 stainless steel |
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JP (1) | JP3152276B2 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5076330B2 (en) * | 2006-02-20 | 2012-11-21 | Jfeスチール株式会社 | Steel continuous casting method |
KR101230120B1 (en) * | 2009-12-21 | 2013-02-05 | 주식회사 포스코 | Continuous casting method for reducing centre porosity in austenite stainless steel |
JP2011218408A (en) * | 2010-04-09 | 2011-11-04 | Nippon Steel Corp | Continuous casting method of metal |
JP5801647B2 (en) * | 2011-03-17 | 2015-10-28 | 新日鐵住金ステンレス株式会社 | High N content stainless steel having excellent surface resistance and method for producing the same |
-
1994
- 1994-12-21 JP JP33644094A patent/JP3152276B2/en not_active Expired - Lifetime
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JPH08174164A (en) | 1996-07-09 |
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