JPH09276993A - Light rolling reduction method at end stage of solidification in rotary continuous casting - Google Patents
Light rolling reduction method at end stage of solidification in rotary continuous castingInfo
- Publication number
- JPH09276993A JPH09276993A JP11852296A JP11852296A JPH09276993A JP H09276993 A JPH09276993 A JP H09276993A JP 11852296 A JP11852296 A JP 11852296A JP 11852296 A JP11852296 A JP 11852296A JP H09276993 A JPH09276993 A JP H09276993A
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- Prior art keywords
- continuous casting
- slab
- rolling reduction
- rolling
- stage
- Prior art date
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は回転連続鋳造鋳片の
中心部にみられる不純物元素、即ち鋼鋳片の場合には硫
黄、燐、マンガン等の偏析を防止し均質な金属を得るた
めの凝固末期軽圧下方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent the segregation of impurity elements found in the center of rotary continuous casting slabs, that is, in the case of steel slabs, to segregate sulfur, phosphorus, manganese, etc. It relates to a method of light reduction at the end of coagulation.
【0002】[0002]
【従来の技術】製鋼工程では溶融金属を鋳型内で連続的
に冷却固化させて鋳片を製造する連続鋳造工程が、生産
性と品質の安定の面から殆どの製鋼工場で採用されてい
る。鋳片の品質としては表面性状の良好なものおよび内
部欠陥がないものが望まれている。2. Description of the Related Art In the steelmaking process, a continuous casting process in which molten metal is continuously cooled and solidified in a mold to produce a slab is adopted in most steelmaking plants from the viewpoint of stable productivity and quality. As for the quality of the slab, it is desired that the slab has good surface properties and is free from internal defects.
【0003】表面性状を良好にするための対策として、
回転連続鋳造方法がAndre L. Gueussier,et.al.:「Spec
ific aspects of rotary continuous casting 」, Iron
andSteel Engineer, January(1982), p.53 に開示され
ている。この方法で得られた鋳片断面内の炭素の分布が
図8のように示されており、これによると最終凝固位置
に相当する断面中心部に正偏析部があることが判る。こ
のような鋼の中心偏析部には硫黄、マンガンなどの不純
物が濃化・偏析して、製品の使用過程や線材の線引き工
程で中心偏析部が割れる事故が発生しやすいため、中心
偏析の低減が切望されている。As a measure for improving the surface quality,
The rotary continuous casting method is Andre L. Gueussier, et.al .: Spec
ific aspects of rotary continuous casting ``, Iron
andSteel Engineer, January (1982), p.53. The distribution of carbon in the cross section of the slab obtained by this method is shown in FIG. 8, which shows that there is a positive segregation portion at the center of the cross section corresponding to the final solidification position. Reduction of center segregation because impurities such as sulfur and manganese are concentrated and segregated in the center segregation part of such steel, and the center segregation part is easily cracked during the product use process or wire drawing process. Is coveted.
【0004】図7は固定モールドの連続鋳造で製造した
矩形鋳片の厚さ方向の炭素および硫黄の濃度分布を示す
図である。矩形断面の鋳片の場合でも回転連続鋳造で製
造した丸断面鋳片と同様に、中心部に炭素や硫黄の正偏
析帯を有することが判る。矩形断面鋳片の中心偏析の低
減対策として、特公昭59−1682には溶融金属の連
続鋳造工程における二次冷却帯に続く引抜工程におい
て、1対若しくは複数対の圧下ロールにより鋳片の液相
線クレーター先端と固相線クレーター先端との間を定常
引抜過程で1対のロール当たり圧下率が1.5%以下で
定常引抜過程を連続的に圧下することを特徴とする連続
鋳造方法が開示されている。FIG. 7 is a diagram showing the concentration distribution of carbon and sulfur in the thickness direction of a rectangular slab produced by continuous casting of a fixed mold. It can be seen that even in the case of a slab having a rectangular cross section, a positive segregation zone of carbon or sulfur is present in the central portion, as in the case of a round cross section slab manufactured by rotary continuous casting. As a measure for reducing the center segregation of a rectangular cross-section slab, Japanese Examined Patent Publication No. 59-1682 discloses that the liquid phase of the slab is reduced by one or more pairs of reduction rolls in the drawing process following the secondary cooling zone in the continuous casting process of molten metal. Disclosed is a continuous casting method characterized by continuously rolling down between the wire crater tip and the solid phase wire crater tip in a steady drawing process at a rolling reduction rate of 1.5% or less per pair of rolls. Has been done.
【0005】図6はその実施例を示す連続鋳造装置の説
明図で、固定モールド25から引き出された鋳片15を
ピンチロール26を介して圧下装置27を兼ねた引抜き
部で引抜き、湾曲型によって鋳造するに当たり、前記圧
下装置27を兼ねた引抜き部のロール群として油圧等に
より鋳片15に圧下を加え、且つ必要な動力を電気モー
ターの如きによって与え駆動せしめるようにして操業す
る。図5は鋳片15のクレーター先端のモデル図であ
り、液相線クレーター先端21と固相線クレーター先端
22の間の範囲の鋳片15を、引抜きロールの圧下装置
27によって、各1本のロール当たり0.5〜4mmの
圧下を定常引抜過程において連続的に加え操業した結
果、その何れの場合にも中心偏析ないしセンターポロシ
ティの発生を認めることができなかったとしている。FIG. 6 is an explanatory view of a continuous casting apparatus showing an embodiment thereof, in which a cast piece 15 drawn out from a fixed mold 25 is drawn out via a pinch roll 26 by a drawing-out portion which also serves as a rolling down device 27, and a curved die is used. In casting, as a group of rolls of a pulling-out portion which also serves as the rolling down device 27, rolling is applied to the cast slab 15 by hydraulic pressure or the like, and necessary power is applied by an electric motor to drive it. FIG. 5 is a model diagram of the crater tip of the cast slab 15. The cast slab 15 in the range between the liquidus crater tip 21 and the solidus crater tip 22 is drawn by a pulling roll reduction device 27, one each. As a result of continuously applying a rolling reduction of 0.5 to 4 mm per roll in the steady drawing process, it was not possible to recognize the occurrence of center segregation or center porosity in any of the cases.
【0006】また、特公平3−8863には図6に示す
ほぼ同様の設備を用いて、圧下のパススケジュールを若
干変更した以下の連続鋳造方法が開示されている。鋳
片を連続的に引き抜く溶融金属の連続鋳造方法におい
て、鋳片厚み中心部が固相率0.1ないし0.3となる
時点から流動限界固相率となる時点までの領域で、ロー
ル熱反り量が0.5mm未満のロールを用いて0.5m
m/分ないし2.5mm/分の割合で鋳片を連続的に圧
下することを特徴とする連続鋳造方法。および、鋳片
を連続的に引き抜く溶融金属の連続鋳造方法において、
鋳片厚み中心部が固相率0.1ないし0.3となる時点
から流動限界固相率となる時点までの領域で、ロール熱
反り量が0.5mm未満で、かつロール摩耗量が0.5
mm未満のロールを用いて0.5mm/分ないし2.5
mm/分の割合で鋳片を連続的に圧下することを特徴と
する連続鋳造方法である。この例ではロールの熱変形や
摩耗などの外乱を考慮して第5図に示す圧下領域および
圧下速度を規定している。Further, Japanese Examined Patent Publication No. 3-8863 discloses the following continuous casting method in which substantially the same equipment as shown in FIG. 6 is used and the pass schedule for reduction is slightly changed. In a continuous casting method for molten metal in which a slab is continuously drawn out, roll heat is applied in a region from the time when the solid center of the slab has a solid fraction of 0.1 to 0.3 to the time when the solid phase has a fluidity limit. 0.5m using a roll with a warp amount of less than 0.5mm
A continuous casting method characterized by continuously rolling down a slab at a rate of m / min to 2.5 mm / min. And, in the continuous casting method of the molten metal to continuously pull out the slab,
In the region from the time when the solid phase ratio of the slab thickness becomes 0.1 to 0.3 to the flow limit solid phase ratio, the roll thermal warp amount is less than 0.5 mm and the roll wear amount is 0. .5
0.5 mm / min to 2.5 with rolls less than mm
It is a continuous casting method characterized by continuously rolling down a slab at a rate of mm / min. In this example, the roll-down area and roll-down speed shown in FIG. 5 are defined in consideration of disturbances such as thermal deformation and wear of the roll.
【0007】以上の先行特許の例からも判るように、連
続鋳造において鋳片に適当な条件で凝固末期軽圧下を行
うことにより、中心偏析帯の発生を防止することが可能
である。As can be seen from the examples of the above-mentioned prior patents, the occurrence of the central segregation zone can be prevented by subjecting the slab in the continuous casting to a light reduction in the final stage of solidification under appropriate conditions.
【0008】この凝固末期軽圧下方法を、前記の回転連
続鋳造による鋳片に適用すれば、表面性状が良好でかつ
内部欠陥の少ない理想的な鋳片を製造できることにな
る。しかし、回転連続鋳造工程の鋳片は100rpm程
度の速度で回転しているので、図6に示す従来技術の圧
下方法では圧下ロールが鋳片の回転を拘束して鋳造がで
きないという問題があった。By applying this final solidification light reduction method to a slab produced by the above rotary continuous casting, it is possible to produce an ideal slab having good surface properties and few internal defects. However, since the slab in the continuous rotation casting process is rotating at a speed of about 100 rpm, the conventional rolling reduction method shown in FIG. 6 has a problem that the reduction roll restrains the rotation of the slab and casting cannot be performed. .
【0009】[0009]
【発明が解決しようとする課題】以上に示すように、従
来、表面性状が良好で中心偏析の少ない鋳片を製造する
ために、回転連続鋳造工程で回転中の鋳片に凝固末期軽
圧下を行う適当な方法が無く、中心偏析の少ない鋳片を
製造することが困難であった。回転連鋳工程で鋳片に凝
固末期軽圧下を適用するためには、回転しながら引抜か
れる鋳片の回転を拘束せずに連続的に圧下を行う軽圧下
方法の開発が緊急の課題であった。As described above, in order to produce a slab having good surface properties and less center segregation, light rolling at the final stage of solidification is applied to a slab being rotated in a rotary continuous casting process. It was difficult to manufacture a slab with less center segregation because there was no suitable method to do it. In order to apply the final solidification light reduction to the slab in the rotary continuous casting process, it is an urgent task to develop a light reduction method that continuously reduces the rotation of the slab that is drawn while it is rotating. It was
【0010】[0010]
【課題を解決するための手段】上記の課題を解決するた
めの本発明の手段は、請求項1の発明では、鋳片を回転
させながら連続的に引抜く溶融金属の回転連続鋳造にお
ける連続鋳造工程の二次冷却帯に続く引抜工程におい
て、1段若しくは複数段の圧下装置により鋳片の液相線
クレーター先端と固相線クレーター先端との間を連続的
に圧下することを特徴とする回転連続鋳造の凝固末期軽
圧下方法である。Means for Solving the Problems According to the invention of claim 1, the means for solving the above-mentioned problems is continuous casting in rotary continuous casting of molten metal for continuously drawing a slab while rotating it. In the drawing step following the secondary cooling zone of the step, a rotation characterized by continuously reducing between the liquidus crater tip and the solidus crater tip of the slab by a single-stage or multiple-stage reduction device This is a light-rolling reduction method in the final stage of solidification in continuous casting.
【0011】請求項2の発明では、圧下方法としては圧
下装置が複数の傾斜ロールからなる傾斜圧延であること
を特徴とする請求項1に記載の回転連続鋳造の凝固末期
軽圧下方法である。According to the second aspect of the invention, as the rolling reduction method, the rolling reduction apparatus is an inclined rolling comprising a plurality of inclined rolls.
【0012】請求項3の発明では、圧下装置1段当たり
断面積減少率が1.5%以下で定常引抜過程を連続的に
圧下することを特徴とする請求項1または請求項2の手
段における回転連続鋳造の凝固末期軽圧下方法である。According to a third aspect of the invention, the steady drawing process is continuously reduced when the reduction rate of the cross-sectional area per stage of the reduction device is 1.5% or less. This is a method of light rolling at the end of solidification in rotary continuous casting.
【0013】請求項4の発明では、鋳片中心部が固相率
0.1〜0.3となる時点から流動限界固相率となる時
点までの領域で鋳片を連続的に圧下することを特徴とす
る請求項1ないし請求項3の手段のいずれかにおける回
転連続鋳造の凝固末期軽圧下方法である。According to the fourth aspect of the invention, the slab is continuously rolled down in the region from the time when the solid portion has a solid fraction of 0.1 to 0.3 to the flow limit solid fraction. The method for lightly reducing the final stage of solidification in rotary continuous casting according to any one of claims 1 to 3.
【0014】以下に本発明の作用を詳述する。鋳片を回
転させながら連続的に引抜く溶融金属の回転連続鋳造に
おいて凝固末期軽圧下方法の適用例は皆無であり、発明
者は回転連続鋳造方法に固有な特性を考慮して、軽圧下
方法の適用を様々な角度から検討した。その結果、発明
者らは、図1に示すように、連続鋳造装置の二次冷却帯
と鋳片の回転駆動装置を有するエキストラクターユニッ
トの間に1段若しくは複数段の圧下装置を配置すること
を知見した。即ち、回転モールド4から引抜かれた鋳片
15は、エキストラクターユニットで回転力および引抜
き力を与えられ回転しながら鋳片一次冷却帯5および二
次冷却帯7を通過して冷却され凝固した後に切断装置1
3で切断されてビレット又はブルームとなる。二次冷却
帯を通過後に鋳片は図5に示すように中心部が凝固する
ので、その際に液相線クレーター先端21と固相線クレ
ーター22の間の範囲の鋳片15を、圧下装置9によっ
て所定量連続的に圧下する。その後、中心部まで凝固し
て十分な強度を確保した鋳片15をエキストラクターユ
ニットで回転駆動力を付与しながら所定速度で送り、そ
の直後に完全凝固した鋳片15を切断装置13で所定長
さに切断してビレット又はブルームとする。The operation of the present invention will be described in detail below. There is no application example of the final solidification light reduction method in the rotary continuous casting of molten metal that continuously draws while rotating the slab, and the inventor considers the characteristics unique to the rotary continuous casting method and considers the light reduction method. Was examined from various angles. As a result, the inventors, as shown in FIG. 1, arrange a single-stage or multiple-stage reduction device between the secondary cooling zone of the continuous casting device and the extractor unit having the slab rotation drive device. I found out. That is, the slab 15 drawn from the rotary mold 4 is rotated and solidified by being passed through the slab primary cooling zone 5 and the secondary cooling zone 7 while being rotated by being given a rotational force and a drawing force by the extractor unit. Cutting device 1
Cut into billets or blooms at 3. After passing through the secondary cooling zone, the slab solidifies in the central portion as shown in FIG. 5, and at that time, the slab 15 in the range between the liquidus crater tip 21 and the solidus crater 22 is reduced. A predetermined amount is continuously reduced by 9. After that, the slab 15 that has solidified to the center and secured sufficient strength is sent at a predetermined speed while applying a rotational driving force by the extractor unit, and immediately after that, the slab 15 that has completely solidified is cut by the cutting device 13 for a predetermined length. Cut it into billets or blooms.
【0015】また、望ましくは、圧下装置として、図2
に示すように傾斜角可変の複数の傾斜ロール式の圧下ロ
ール23と、必要であればガイドシュー24から構成さ
れるものとする。圧下ロールとして傾斜ロールを用いる
のは、鋳片を圧下した際に、鋳片の回転および送りに追
従して連続的に鋳片を圧下できるためである。ロールの
傾斜角を可変にしたのは、圧下率によって傾斜角を最適
値に調節し回転と送りのマッチングを図るためである。
また、ガイドシューは図3に示すように、鋳片の圧下に
よる断面の変形形状が円から多角形になるのを防止し
て、圧下による有害な割れを防止するために用いるもの
であり、圧下条件によって割れ発生の心配の無い場合は
省略しても良い。Further, it is preferable that the pressure reducing device shown in FIG.
As shown in FIG. 5, it comprises a plurality of inclined roll type reduction rolls 23 with variable inclination angles, and guide shoes 24 if necessary. The reason why the inclined roll is used as the pressing roll is that, when the slab is pressed, the slab can be continuously rolled down by following the rotation and the feeding of the slab. The inclination angle of the roll is made variable in order to adjust the inclination angle to an optimum value according to the reduction rate to achieve matching between rotation and feed.
Further, as shown in FIG. 3, the guide shoe is used to prevent the deformed shape of the cross section of the cast slab from being changed from a circle to a polygon, and to prevent harmful cracking due to the reduction. It may be omitted if there is no fear of cracking depending on the conditions.
【0016】更に望ましくは、圧下装置1段当たりの断
面減少率が1.5%以下で定常引抜過程を連続的に圧下
する。これは、圧下による凝固シェルのひずみが限界割
れひずみを越えて、鋳片に内部割れが発生しないためで
ある。More preferably, the steady-state drawing process is continuously rolled down when the cross-sectional reduction rate per stage of the rolling-down device is 1.5% or less. This is because the strain of the solidified shell due to rolling exceeds the limit cracking strain, and internal cracks do not occur in the slab.
【0017】また望ましくは、鋳片中心部が固相率0.
1ないし0.3となる時点から流動限界固相率ととなる
時点までの領域で鋳片を連続的に圧下する。これは、有
限段数の圧下装置を有効に利用するために、効果の大き
い圧下範囲を選択的に圧下するためである。Further, it is desirable that the central portion of the slab has a solid fraction of 0.
The slab is continuously rolled in the region from the time point of 1 to 0.3 to the time point of reaching the flow limit solid fraction. This is because in order to effectively use the reduction device having a limited number of stages, the reduction range having a large effect is selectively reduced.
【0018】[0018]
【発明の実施の形態】図1に発明の実施形態を示す。即
ち、レードル1内の溶鋼14は、タンディシュ2、ノズ
ル3を経て、回転モールド4に鋳込まれ、遠心力のため
に回転モールド4に押しつけられることおよび菜種油潤
滑のため表面欠陥の少ない凝固シェルを持つ鋳片15が
形成される。そして鋳片は一次冷却帯5および二次冷却
帯7により冷却されシェル厚さを増して、凝固完了直前
に一段または複数段の圧下装置9により、図5に示す液
相線クレーター先端および固相性クレーター先端の間を
圧下される。その際に図3に示すように鋳片の断面が圧
延機の入り側の鋳片の断面プロフィール19の破線から
圧延機出側の鋳片の断面プロフィール20の実線のよう
に変形し、鋳片の未凝固部17の断面積が減少するた
め、凝固最終位置である鋳片の中心の凝固収縮を補償し
て中心偏析を防止する。尚、同図で16は鋳片の凝固部
を示す。凝固した鋳片は切断装置13により所定寸法の
ビレット又はブルームに切断される。尚、鋳片の回転お
よび送りはエキストラクターユニット11または圧下装
置9によって駆動力を与えられる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the invention. That is, the molten steel 14 in the ladle 1 is cast into the rotary mold 4 through the tundish 2 and the nozzle 3 and is pressed against the rotary mold 4 due to centrifugal force, and a solidified shell with few surface defects due to rapeseed oil lubrication is formed. The slab 15 to hold is formed. Then, the slab is cooled by the primary cooling zone 5 and the secondary cooling zone 7 to increase the shell thickness, and immediately before the completion of solidification, a single-stage or multiple-stage reduction device 9 is used to set the tip of the liquidus crater and the solid phase shown in FIG. It is pressed down between the tips of the sex craters. At that time, as shown in FIG. 3, the cross section of the slab is deformed from the broken line of the cross-sectional profile 19 of the slab on the inlet side of the rolling mill to the solid line of the cross-sectional profile 20 of the slab on the outgoing side of the rolling mill. Since the cross-sectional area of the non-solidified portion 17 of is reduced, the solidification shrinkage of the center of the slab, which is the final solidification position, is compensated to prevent center segregation. In the figure, 16 indicates a solidified portion of the cast slab. The solidified slab is cut by a cutting device 13 into billets or blooms having a predetermined size. The rotation and the feeding of the slab are given a driving force by the extractor unit 11 or the rolling down device 9.
【0019】単位段の圧下装置は図2のような圧下ロー
ル23すなわち傾斜ロールおよびガイドシュー24から
構成され、ロールの本数やガイドシューの有無は圧下条
件により適宜選択すればよい。尚、圧下ロールの傾斜角
は圧下率、鋳片の回転速度および送り速度から最適値に
制御しなければならない。The unit-stage rolling-down device is composed of a rolling-down roll 23 as shown in FIG. 2, that is, an inclined roll and a guide shoe 24. The number of rolls and the presence / absence of a guide shoe may be appropriately selected depending on the rolling-down condition. In addition, the inclination angle of the reduction roll must be controlled to an optimum value from the reduction rate, the rotation speed of the slab, and the feed rate.
【0020】図3に示すように圧下により断面形状が変
化するので、実質断面減少率が狙い値になるように圧下
装置の押し量を設定する必要がある。発明者らは、近年
注目されている有限要素法により圧下パターンと実質断
面減少率の間の関係を推定して、圧下量を設定した。そ
して、図5に示すように実質断面減少率が1.5%以下
で定常引抜過程を連続的に圧下し、圧下による鋳片の内
部割れの発生の防止を図った。As shown in FIG. 3, since the cross-sectional shape changes depending on the rolling reduction, it is necessary to set the pushing amount of the rolling-down device so that the substantial reduction rate of the sectional area becomes a target value. The inventors set the amount of reduction by estimating the relationship between the reduction pattern and the substantial area reduction rate by the finite element method, which has been drawing attention in recent years. Then, as shown in FIG. 5, the steady drawing process was continuously reduced at a substantial cross-section reduction rate of 1.5% or less to prevent the occurrence of internal cracking of the slab due to the reduction.
【0021】また、鋳片中心部が固相率0.1ないし
0.3となる時点から流動限界固相率となる時点までの
領域で鋳片を連続的に圧下するように、複数の圧下装置
の圧下パターンを設定した。Further, a plurality of reductions are performed so that the slab is continuously reduced in the region from the time when the solid fraction of the slab has a solid fraction of 0.1 to 0.3 to the flow critical solid fraction. The rolling pattern of the device was set.
【0022】[0022]
【実施例】図1の回転連続鋳造機に図2のb、c、dで
示す3種類のタイプの圧下装置を1段用いて、S45C
の鋳片の送り速度を調節することにより、クレーターエ
ンド位置を断面減少率が1.5%程度になるように圧下
した。その結果、図4に示すように、中心部の炭素の凝
固偏析を防止することが可能となった。また、燐、マン
ガンなどの他の成分の中心偏析も同様に改善された。EXAMPLE Using the rotary continuous casting machine of FIG. 1 with one stage of three types of reduction devices shown in b, c and d of FIG. 2, S45C
By adjusting the feed rate of the slab, the crater end position was pressed down so that the cross-section reduction rate was about 1.5%. As a result, as shown in FIG. 4, it became possible to prevent solidification segregation of carbon in the central portion. The center segregation of other components such as phosphorus and manganese was also improved.
【0023】また、圧下装置を複数5台設置することに
より鋳片中心部が固相率0.1ないし0.3となる時点
から流動限界固相率となる時点までの領域で鋳片を連続
的に圧下するように、複数の圧下装置の圧下パターンを
設定し、圧下速度に拠らずクレーターエンド位置を圧下
できるため、図4のように中心偏析が大幅に緩和され
た。他の鋼種または金属についても検討したが、S45
Cと同じく中心偏析が緩和された。Further, by installing a plurality of five reduction devices, the slabs are continuous in the region from the time when the solid fraction in the central part of the slab becomes 0.1 to 0.3 to the flow critical solid fraction. Since the rolling patterns of a plurality of rolling down devices are set so that the crater end position can be rolled down regardless of the rolling down speed, the center segregation was significantly alleviated as shown in FIG. Other steel types or metals were also examined, but S45
As with C, center segregation was alleviated.
【0024】[0024]
【発明の効果】以上に説明したとおり、本発明は回転連
続鋳造における連続鋳造工程の二次冷却帯に続く引抜工
程において、1段若しくは複数段の圧下装置により鋳片
を回転しながら鋳片の液相線クレーター先端と固相線ク
レーター先端との間を連続的に圧下することにより、特
に傾斜圧延することにより、回転連続鋳造における鋳片
の回転を拘束せずに連続的に圧下して鋳片の中心偏析を
防止することができ、鋳片の内部品質を格段に向上及び
これに基づく鋳片、棒、線など最終製品の疲労強度向上
に顕著な効果がある。As described above, according to the present invention, in the drawing process following the secondary cooling zone of the continuous casting process in the rotary continuous casting, the slab is produced by rotating the slab by a single-stage or multi-stage reduction device. By continuously rolling down between the liquidus crater tip and the solidus crater tip, especially by tilt rolling, it is possible to perform continuous rolling without restraining the rotation of the slab in rotary continuous casting. It is possible to prevent the center segregation of the slab, and to significantly improve the internal quality of the slab and to improve the fatigue strength of the final product such as the slab, bar and wire based on this.
【図1】本発明の圧下装置を適用した回転連続鋳造装置
の説明図である。FIG. 1 is an explanatory diagram of a rotary continuous casting device to which a rolling reduction device of the present invention is applied.
【図2】本発明の圧下装置を説明する概略図で、(a)
は鋳片と圧下ロール関係を示す側面図、(b)、
(c)、(d)はこれを入り側から見た図で、(b)は
2本ロールの場合、(c)は3本ロールの場合、(d)
は4本ロールの場合を示す。FIG. 2 is a schematic diagram illustrating a rolling down device of the present invention, (a)
Is a side view showing the relationship between the slab and the rolling roll, (b),
(C) and (d) are views as seen from the entrance side. (B) shows the case of a two-roll roll, (c) shows the case of a three-roll roll, (d).
Indicates the case of four rolls.
【図3】本発明の圧下装置の作用を示す図である。FIG. 3 is a view showing the operation of the rolling-down device of the present invention.
【図4】本発明の一実施例の効果を示す説明図である。FIG. 4 is an explanatory diagram showing an effect of one embodiment of the present invention.
【図5】クレータ先端部のモデル図である。FIG. 5 is a model view of a tip portion of a crater.
【図6】従来技術の圧下装置を適用した連続鋳造装置の
説明図である。FIG. 6 is an explanatory diagram of a continuous casting device to which a conventional rolling down device is applied.
【図7】従来技術の連続鋳造により製造された鋳片の偏
析を示す説明図である。FIG. 7 is an explanatory diagram showing segregation of a slab produced by conventional continuous casting.
【図8】従来技術によるビレット横断面における炭素偏
析を示すグラフである。FIG. 8 is a graph showing carbon segregation in a billet cross section according to the prior art.
1 レードル 2 タンディシュ 3 ノズル 4 回転モールド 5 一次冷却帯 6 ガイドロール 7 二次冷却帯 8 ガイドロール 9 圧下装置 10 ピンチロール 11 エキストラクターユニット 12 駆動ユニット 13 切断装置 14 溶鋼 15 鋳片 16 鋳片の凝固部 17 鋳片の未凝固部 18 固液共存域 19 圧延機入り側の鋳片の断面プロフィール 20 圧延機出側の鋳片の断面プロフィール 21 液相線クレーター先端 22 固相線クレーター先端 23 圧下ロール 24 ガイドシュー 25 固定モールド 26 ピンチロール 27 圧下装置 1 Ladle 2 Tundish 3 Nozzle 4 Rotating Mold 5 Primary Cooling Zone 6 Guide Roll 7 Secondary Cooling Zone 8 Guide Roll 9 Rolling Down Device 10 Pinch Roll 11 Extractor Unit 12 Drive Unit 13 Cutting Device 14 Molten Steel 15 Cast Piece 16 Solidification of Cast Piece Part 17 Unsolidified part of slab 18 Solid-liquid coexistence region 19 Cross-sectional profile of slab on inlet side of rolling mill 20 Cross-sectional profile of slab on outgoing side of rolling mill 21 Liquid-phase crater tip 22 Solid-phase crater tip 23 Rolling roll 24 Guide shoe 25 Fixed mold 26 Pinch roll 27 Rolling down device
Claims (4)
融金属の回転連続鋳造における連続鋳造工程の二次冷却
帯に続く引抜工程において、1段若しくは複数段の圧下
装置により鋳片の液相線クレーター先端と固相線クレー
ター先端との間を連続的に圧下することを特徴とする回
転連続鋳造の凝固末期軽圧下方法。1. A slab liquid is drawn by a single-stage or multiple-stage reduction device in a drawing process following a secondary cooling zone in a continuous casting process in the rotary continuous casting of molten metal in which the slab is continuously drawn while rotating. A method for lightly reducing the final stage of solidification in rotary continuous casting, characterized by continuously reducing the space between the tip of the phase line crater and the tip of the solid phase crater.
ロールからなる傾斜圧延であることを特徴とする請求項
1に記載の回転連続鋳造の凝固末期軽圧下方法。2. The method of light rolling at the end of solidification of rotary continuous casting according to claim 1, wherein the rolling down method is tilt rolling comprising a plurality of tilt rolls.
5%以下で定常引抜過程を連続的に圧下することを特徴
とする請求項1または請求項2に記載の回転連続鋳造の
凝固末期軽圧下方法。3. The cross-sectional area reduction rate per stage of the rolling-down device is 1.
The final solidification light reduction method of rotary continuous casting according to claim 1 or 2, wherein the steady drawing process is continuously reduced at 5% or less.
る時点から流動限界固相率となる時点までの領域で鋳片
を連続的に圧下することを特徴とする請求項1ないし請
求項3のいずれかに記載の回転連続鋳造における凝固末
期軽圧下方法。4. The slab is continuously rolled down in a region from the time when the solid fraction of the slab has a solid fraction of 0.1 to 0.3 to the time when the solid fraction has a flow limit. A method for lightly reducing the final stage of solidification in rotary continuous casting according to any one of claims 1 to 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11852296A JPH09276993A (en) | 1996-04-15 | 1996-04-15 | Light rolling reduction method at end stage of solidification in rotary continuous casting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11852296A JPH09276993A (en) | 1996-04-15 | 1996-04-15 | Light rolling reduction method at end stage of solidification in rotary continuous casting |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09276993A true JPH09276993A (en) | 1997-10-28 |
Family
ID=14738705
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11852296A Pending JPH09276993A (en) | 1996-04-15 | 1996-04-15 | Light rolling reduction method at end stage of solidification in rotary continuous casting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09276993A (en) |
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CN107116192A (en) * | 2017-06-27 | 2017-09-01 | 中冶京诚工程技术有限公司 | Continuous casting billet pressing equipment |
WO2018192903A1 (en) * | 2017-04-20 | 2018-10-25 | Inteco Melting And Casting Technologies Gmbh | Method and device for producing foundry ingots from metal |
JP2021514840A (en) * | 2019-02-01 | 2021-06-17 | 東北大学Northeastern University | Equipment and method to realize core reduction processing technology in the solidification process of continuous casting of circular billets |
CN114905016A (en) * | 2022-06-13 | 2022-08-16 | 武汉大西洋连铸设备工程有限责任公司 | Mechanical rotary stirring device applied to casting blank solidification process |
-
1996
- 1996-04-15 JP JP11852296A patent/JPH09276993A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2018192903A1 (en) * | 2017-04-20 | 2018-10-25 | Inteco Melting And Casting Technologies Gmbh | Method and device for producing foundry ingots from metal |
CN110545935A (en) * | 2017-04-20 | 2019-12-06 | 英特科熔铸技术有限公司 | Method and device for producing ingots made of metal |
US11020795B2 (en) | 2017-04-20 | 2021-06-01 | Inteco Melting And Casting Technologies Gmbh | Method and device for producing foundry ingots from metal |
CN110545935B (en) * | 2017-04-20 | 2022-02-11 | 英特科熔铸技术有限公司 | Method and device for producing ingots made of metal |
CN107116192A (en) * | 2017-06-27 | 2017-09-01 | 中冶京诚工程技术有限公司 | Continuous casting billet pressing equipment |
JP2021514840A (en) * | 2019-02-01 | 2021-06-17 | 東北大学Northeastern University | Equipment and method to realize core reduction processing technology in the solidification process of continuous casting of circular billets |
CN114905016A (en) * | 2022-06-13 | 2022-08-16 | 武汉大西洋连铸设备工程有限责任公司 | Mechanical rotary stirring device applied to casting blank solidification process |
CN114905016B (en) * | 2022-06-13 | 2024-01-12 | 武汉大西洋连铸设备工程有限责任公司 | Mechanical rotary stirring device applied to casting blank solidification process |
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