JP3348667B2 - Manufacturing method of round billet slab by continuous casting - Google Patents
Manufacturing method of round billet slab by continuous castingInfo
- Publication number
- JP3348667B2 JP3348667B2 JP36316598A JP36316598A JP3348667B2 JP 3348667 B2 JP3348667 B2 JP 3348667B2 JP 36316598 A JP36316598 A JP 36316598A JP 36316598 A JP36316598 A JP 36316598A JP 3348667 B2 JP3348667 B2 JP 3348667B2
- Authority
- JP
- Japan
- Prior art keywords
- slab
- round billet
- reduction amount
- casting
- casting speed
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、連続鋳造による丸
ビレット鋳片の製造方法に関し、特に、いわゆる未凝固
圧下および凝固後成形法を用いた連続鋳造による製管用
の丸ビレット鋳片の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing round billet slabs by continuous casting, and more particularly, to a method for producing round billet slabs for pipe making by continuous casting using a so-called unsolidification rolling and post-solidification molding method. About.
【０００２】[0002]
【従来の技術】連続鋳造により丸ビレット鋳片を製造す
る場合、丸ビレット鋳片の材質が低炭素鋼、軸受け鋼ま
たは高Cr鋼であると、最後に凝固する鋳片中心部に偏析
(中心偏析) 、軸芯割れさらにはポロシティ等の鋳造欠
陥が発生する。2. Description of the Related Art When a round billet slab is manufactured by continuous casting, if the material of the round billet slab is low carbon steel, bearing steel or high Cr steel, segregation occurs at the center of the slab which solidifies last.
(Center segregation), casting defects such as cracks in the shaft core and porosity.
【０００３】このような鋳造欠陥が発生した丸ビレット
鋳片をシームレスパイプの製造にそのまま用いようとす
ると、鋳造欠陥に起因して、成品に内面疵が多発してし
まい、製品とならない。If a round billet slab having such a casting defect is used as it is in the production of a seamless pipe, an inner surface defect frequently occurs in the product due to the casting defect, and the product does not become a product.
【０００４】そこで、丸ビレット鋳片の鋳造欠陥を抑制
して内面品質を向上するために、鋳込まれた連続鋳造鋳
片に圧下を行うことにより、鋳造欠陥の発生を防止する
技術が、多数提案されている。これらの技術は、未凝固
圧下および凝固後成形法といわれている。Therefore, in order to suppress the casting defects of the round billet slab and improve the inner surface quality, there are a number of techniques for preventing the occurrence of casting defects by rolling down the cast continuous cast slab. Proposed. These techniques are referred to as unsolidification rolling and post-solidification molding methods.
【０００５】例えば特開平10−249490号公報や特開平10
−146651号公報には、いずれも、連続鋳造鋳片の中心部
が未凝固部の位置で圧下ロール対により大圧下を行い、
その後に真円に成形する方法が開示されている。これら
の方法によれば、中心部が未凝固であるときに大圧下を
行うことにより、中心部における濃化溶鋼に流動を与え
て鋳込み上流側へ排出する。このため、丸ビレット鋳片
の中心偏析を低減でき、かつ中心ポロシティを消滅でき
るとされている。For example, JP-A-10-249490 and JP-A-10-249490
In the publication No. -146651, the central portion of the continuous cast slab is subjected to a large reduction with a pair of reduction rolls at a position of an unsolidified portion,
Thereafter, a method of forming a perfect circle is disclosed. According to these methods, a large reduction is performed when the central portion is not solidified, thereby giving a flow to the concentrated molten steel in the central portion and discharging the steel to the upstream of the casting. Therefore, it is said that the center segregation of the round billet slab can be reduced and the center porosity can be eliminated.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、これら
の方法を実際の連続鋳造ラインに適用しようとすると、
鋳込速度を変動させると、得られる丸ビレット鋳片の真
円成形性が悪化し、製管不可能な形状になってしまうこ
とがあることがわかった。However, when these methods are applied to an actual continuous casting line,
It was found that when the casting speed was changed, the roundness of the obtained round billet castability was deteriorated, and the round billet slab was sometimes formed into a shape that could not be manufactured.
【０００７】ここに、本発明の目的は、丸ビレット鋳片
の中心偏析を低減できるとともに中心ポロシティを消滅
でき、鋳込速度を変動させた場合にも所望の真円度を確
保できる、連続鋳造による丸ビレット鋳片の製造方法を
提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a continuous casting method capable of reducing center segregation of a round billet slab, eliminating center porosity, and securing a desired roundness even when the casting speed is varied. To provide a method for producing a round billet slab.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために検討を重ね、以下に列記する知見お
よびを得た。Means for Solving the Problems The present inventors have studied to solve the above-mentioned problems, and have obtained the following knowledge and findings.
【０００９】鋳込速度を増加させると、垂直ロールを
用いて成形加工を行う場合には、鋳片の上下方向の厚み
戻り量が増加する。 そのため、鋳込速度により決定される厚み戻り量に応
じて、内部に未凝固部を有する鋳片に対する水平ロール
の圧下量を決定することにより、真円成形性を一定に保
ち、所望の真円度を確保できる。When the casting speed is increased, when the forming process is performed using a vertical roll, the thickness return amount of the slab in the vertical direction increases. Therefore, by determining the amount of reduction of the horizontal roll with respect to the slab having an unsolidified portion therein according to the thickness return amount determined by the casting speed, the roundness is maintained constant, and the desired roundness is maintained. Degree can be secured.
【００１０】ここに、本発明の要旨とするところは、内
部に未凝固部を有するとともに横断面が略円形である連
続鋳造鋳片を、１組以上の一対の水平ロールで所定の圧
下量で圧下することにより、横断面を略楕円形とした
後、１組以上の一対の孔型の垂直ロールで圧下すること
により、丸ビレット鋳片を製造する際に、鋳造速度を増
加させる場合には、略楕円形を有する連続鋳造鋳片の短
径と、丸ビレット鋳片の直径との偏差の増加分に応じて
水平ロールの圧下量を上述した所定の圧下量よりも増加
して圧下を行い、鋳造速度を減少させる場合には、上述
した偏差の減少分に応じて水平ロールの圧下量を上述し
た所定の圧下量よりも減少して圧下を行うことを特徴と
する連続鋳造による丸ビレット鋳片の製造方法である。Here, the gist of the present invention is that a continuous cast slab having an unsolidified portion therein and having a substantially circular cross section is provided with a predetermined pressure by one or more pairs of horizontal rolls.
By reducing the amount by the lower amount , the cross section is made substantially elliptical, and then, by reducing the rolling by one or more pairs of vertical rolls of a hole type, the casting speed is increased when manufacturing round billet slabs.
When adding a continuous cast slab having a substantially elliptical shape,
Depending on the increase in deviation between the diameter and the diameter of the round billet slab
Increase the amount of reduction of the horizontal roll from the specified amount of reduction described above
When reducing the casting speed by reducing the casting speed,
The amount of reduction of the horizontal roll according to the decrease in deviation
A method for producing a round billet slab by continuous casting, characterized in that the rolling is performed with a reduction of less than a predetermined reduction amount .
【００１１】また、別の面からは、本発明は、内部に未
凝固部を有するとともに横断面が略円形である連続鋳造
鋳片を、１組以上の一対の垂直ロールで所定の圧下量で
圧下することにより、横断面を略楕円形とした後、１組
以上の一対の孔型の水平ロールで圧下することにより、
丸ビレット鋳片を製造する際に、鋳造速度を増加させる
場合には、略楕円形を有する連続鋳造鋳片の短径と、丸
ビレット鋳片の直径との偏差の増加分に応じて垂直ロー
ルの圧下量を上述した所定の圧下量よりも増加して圧下
を行い、鋳造速度を減少させる場合には、上述した偏差
の減少分に応じて垂直ロールの圧下量を上述した所定の
圧下量よりも減少して圧下を行うことを特徴とする連続
鋳造による丸ビレット鋳片の製造方法である。Further, from another aspect, the present invention provides a continuous cast slab having an unsolidified portion therein and having a substantially circular cross section at a predetermined reduction amount by one or more pairs of vertical rolls. By rolling down, the cross section is made substantially elliptical, and then by rolling down with one or more pairs of hole-shaped horizontal rolls,
Increase the casting speed when producing round billet slabs
In the case, the short diameter of the continuous cast slab having a substantially elliptical shape,
Depending on the increase in deviation from billet slab diameter, vertical row
The reduction amount of the screw is increased from the above-mentioned predetermined reduction amount.
If the casting speed is reduced,
The amount of reduction of the vertical roll according to the decrease
A method for producing a round billet slab by continuous casting, characterized in that a reduction is performed with a reduction amount smaller than a reduction amount .
【００１２】[0012]
【発明の実施の形態】以下、本発明にかかる連続鋳造に
よる丸ビレット鋳片の製造方法の実施形態を、添付図面
を参照しながら、詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for producing a round billet slab by continuous casting according to the present invention will be described in detail with reference to the accompanying drawings.
【００１３】図１は、本実施形態における、連続鋳造に
よる丸ビレット鋳片の製造工程10を模式的に示す説明図
である。また、図２は、図１における鋳片４の横断面形
状を示す説明図であり、図２(a) は図１におけるＡ−Ａ
断面図、図２(b) は図１におけるＢ−Ｂ断面図、図２
(c) は図１におけるＣ−Ｃ断面図である。FIG. 1 is an explanatory view schematically showing a manufacturing process 10 of a round billet slab by continuous casting in the present embodiment. FIG. 2 is an explanatory view showing the cross-sectional shape of the slab 4 in FIG. 1, and FIG.
FIG. 2B is a sectional view taken along line BB in FIG.
(c) is a CC sectional view in FIG. 1.
【００１４】図１において、タンディッシュ１から、水
平断面形状が円形である連続鋳造用鋳型２に注入された
溶鋼３は、鋳型２内において冷却され、凝固シェルが外
側に形成される。形成された凝固シェルの内部には、未
凝固部が残存する。In FIG. 1, molten steel 3 poured from a tundish 1 into a continuous casting mold 2 having a circular horizontal cross-sectional shape is cooled in the mold 2 and a solidified shell is formed outside. An unsolidified portion remains inside the formed solidified shell.
【００１５】鋳型２から引き抜かれた鋳片４は、スプレ
ー冷却帯５を経てピンチロール帯６に入る。この時の鋳
片４の横断面形状は、図２(a) に示すように、略円形の
ままである。The slab 4 drawn from the mold 2 enters the pinch roll zone 6 via the spray cooling zone 5. At this time, the cross-sectional shape of the slab 4 remains substantially circular as shown in FIG.
【００１６】そして、ピンチロール帯６を通過した鋳片
４は、一対の未凝固圧下水平ロール７、７により、中心
部が未凝固の状態のままで、大圧下される。一対の未凝
固圧下水平ロール７、７により大圧下された鋳片４は、
図２(b) に示すように、略楕円形の断面形状を呈する。The slab 4 having passed through the pinch roll band 6 is greatly reduced by a pair of unsolidified rolling horizontal rolls 7 and 7 while the central portion remains unsolidified. The slab 4 greatly reduced by the pair of unsolidified reduction horizontal rolls 7 is
As shown in FIG. 2B, it has a substantially elliptical cross-sectional shape.
【００１７】この後、図１および図２(b) に示す形状と
なった鋳片４は、鋳片内部が完全凝固する領域に設けら
れた一対の成形用垂直ロール８、８にて真円成形され
る。図示例では、一対の成形用垂直ロール８、８は一組
しか設けていないが、必要に応じて、成形用垂直ロー
ル、成形用水平ロール・・・というように、垂直ロー
ル、水平ロールを交互に複数段設けてもよい。また、成
形用垂直ロールを複数段設けた後、成形用水平ロールを
複数段設けてもよい。Thereafter, the slab 4 having the shape shown in FIGS. 1 and 2 (b) is rounded by a pair of forming vertical rolls 8 provided in a region where the inside of the slab is completely solidified. Molded. In the illustrated example, only one pair of the pair of forming vertical rolls 8 and 8 is provided, but if necessary, the vertical rolls and the horizontal rolls are alternated, such as a forming vertical roll, a forming horizontal roll, and so on. May be provided in a plurality of stages. Further, after providing a plurality of vertical forming rolls, a plurality of horizontal forming rolls may be provided.
【００１８】また、本実施形態では、未凝固圧下水平ロ
ール７、７により鋳片４を扁平に大圧下し、成形用垂直
ロール８、８により成形を行うこととしたが、これが逆
でもよい。例えば、未凝固圧下垂直ロールにより鋳片４
を扁平に大圧下し、成形用水平ロールにより成形を行っ
てもよい。そして、鋳片４は、引き抜きピンチロール９
によって引き抜かれ、シームレスパイプ製造用の丸ビレ
ット鋳片４' とされる。Further, in the present embodiment, the slab 4 is flatly and largely reduced by the unsolidified reduction horizontal rolls 7 and 7 and the molding is performed by the forming vertical rolls 8 and 8. For example, a slab 4 is formed by a vertical roll under unsolidified pressing.
May be flattened to a large pressure and formed by a horizontal roll for forming. And the slab 4 is pulled out by a pinch roll 9.
To form a round billet slab 4 ′ for manufacturing a seamless pipe.
【００１９】ここで、一対の未凝固圧下水平ロール７、
７により大圧下を行われることにより、図２(b) に示す
ように大きく扁平した鋳片４を、図２(c) に示すように
一対の成形用垂直ロール８、８により所定の形状に成形
圧延すると、鋳片４の厚さが一対の成形用垂直ロール
８、８の圧下方向と直交する方向 (図２(c) における上
下方向) に戻る現象が発生する。Here, a pair of unsolidified rolling down horizontal rolls 7,
7, the large flat cast piece 4 as shown in FIG. 2 (b) is formed into a predetermined shape by a pair of forming vertical rolls 8 and 8 as shown in FIG. 2 (c). During the forming and rolling, a phenomenon occurs in which the thickness of the slab 4 returns to the direction (vertical direction in FIG. 2 (c)) orthogonal to the pressing direction of the pair of forming vertical rolls 8, 8.
【００２０】すなわち、図２(b) における略楕円形を有
する鋳片４の短径をｄ1 とし、図２(c) における丸ビレ
ット鋳片４の直径をｄ2 とすると、本実施形態では、鋳
片４の厚さが (ｄ2 −ｄ1)だけ、増加したことになる。
ここで、鋳片４の短径ｄ1 と丸ビレット鋳片４の直径ｄ
2 との偏差ｄ3 ＝ (ｄ2 −ｄ1)を、「厚み戻り量」と定
義する。That is, assuming that the short diameter of the cast piece 4 having a substantially elliptical shape in FIG. 2B is d 1 and the diameter of the round billet cast piece 4 in FIG. 2C is d 2 , the thickness of the slab 4 only (d 2 -d 1), so that the increased.
Here, the short diameter d 1 of the slab 4 and the diameter d of the round billet slab 4
2 deviation between d 3 = a (d 2 -d 1), is defined as "thickness return amount".
【００２１】図１に示す丸ビレット鋳片の製造工程10に
おいて連続鋳造を行っている際に、鋳造速度を増加する
と、各工程における鋳片温度が上昇して、鋳片４の変形
抵抗が低下する。このため、厚み戻り量ｄ3 が増加す
る。During continuous casting in the round billet slab manufacturing process 10 shown in FIG. 1, when the casting speed is increased, the slab temperature in each step increases, and the deformation resistance of the slab 4 decreases. I do. Therefore, the thickness return amount d 3 increases.
【００２２】この厚み戻り量ｄ3 が大き過ぎて、鋳片４
の目標径を超えた状況の一例を、図３に模式的に示す。
図３に例示するように、厚み戻り量ｄ3 が大き過ぎる
と、鋳片４は、一対の成形用垂直ロール８、８の隙間か
ら噛み出し、膨出部４''が形成されてしまう。このた
め、鋳片４は、製管不可能な形状となってしまう。When the thickness return d 3 is too large, the slab 4
FIG. 3 schematically shows an example of a situation in which the target diameter is exceeded.
As illustrated in FIG. 3, when the thickness return amount d 3 is too large, the slab 4 is out chewing from the gap of the pair of the forming vertical rolls 8,8, the bulging portion 4 '' is formed. For this reason, the slab 4 has a shape in which pipe production is impossible.
【００２３】図４は、直径 225mmの鋳片４から直径178
mmの丸ビレット鋳片４' を連続鋳造により製造する際
の、成形時の鋳込速度x(m/min)と、鋳片厚み戻り量y(m
m) との関係を示すグラフである。図４においては、y
＝68x −82.8、相関係数R2＝0.9863である。図４に示す
ように、鋳込速度を増加すると、鋳片厚み戻り量が増加
する。FIG. 4 shows a slab 4 having a diameter of 178 mm from a slab 4 having a diameter of 225 mm.
The casting speed x (m / min) during molding and the thickness return y (m
m) is a graph showing the relationship with m. In FIG. 4, y
= 68x -82.8, a correlation coefficient R 2 = 0.9863. As shown in FIG. 4, when the pouring speed is increased, the slab thickness return amount increases.
【００２４】そこで、本実施形態では、図３に示すよう
な一対の成形用垂直ロール８、８の隙間からの鋳片４の
噛み出しを防止するため、鋳込速度を増加させる場合に
は、鋳込速度の増加による鋳片厚み戻り量の増加分を見
込んで、未凝固圧下水平ロール７、７により行われる大
圧下の圧下量を、増加するのである。Therefore, in this embodiment, in order to prevent the casting slab 4 from biting out from the gap between the pair of forming vertical rolls 8 as shown in FIG. In anticipation of an increase in the slab thickness return amount due to an increase in the casting speed, the amount of large reduction performed by the unsolidified reduction horizontal rolls 7 is increased.
【００２５】具体的には、鋳込速度の増加による鋳片厚
み戻り量の増加分をΔr とし、鋳込速度の増加前に既に
設定してある圧下量をr0とすると、鋳込速度の増加後の
未凝固圧下水平ロール７、７の圧下量r1は、r1＝r0＋Δ
r となる。More specifically, assuming that the increase in the slab thickness return amount due to the increase in the casting speed is Δr, and the rolling reduction already set before the increase in the casting speed is r 0 , The reduction amount r 1 of the unsolidified reduction horizontal rolls 7 after the increase is r 1 = r 0 + Δ
r.
【００２６】これにより、図３に示すような一対の成形
用垂直ロール８、８の隙間からの鋳片４の噛み出しは、
確実に防止され、丸ビレット鋳片の中心偏析を低減する
とともに中心ポロシティを消滅させながら、鋳込速度を
変動させた場合にも所望の真円度を確保できる。As a result, the bite of the slab 4 from the gap between the pair of forming vertical rolls 8 as shown in FIG.
As a result, the desired roundness can be ensured even when the casting speed is varied while reducing the central segregation of the round billet slab and eliminating the central porosity.
【００２７】[0027]
【実施例】さらに、本発明にかかる連続鋳造による丸ビ
レット鋳片の製造方法を、実施例を参照しながら、より
具体的に説明する。EXAMPLES Further, a method for producing a round billet slab by continuous casting according to the present invention will be described more specifically with reference to examples.
【００２８】図１に示す丸ビレット鋳片の製造工程10と
略同様の設備を用い、直径225 mmの円形の水平断面形状
を呈する連続鋳造用鋳型により、表１に示す各条件で、
丸ビレット鋳片４' を鋳造した。Using substantially the same equipment as that used in the round billet slab manufacturing process 10 shown in FIG. 1 and using a continuous casting mold having a circular horizontal cross-sectional shape having a diameter of 225 mm under the conditions shown in Table 1,
A round billet slab 4 'was cast.
【００２９】未凝固圧下水平ロール７、７による圧下位
置は、溶湯メニスカスから23ｍの位置とし、成形用垂直
ロール８の圧下位置は、溶湯メニスカスから32ｍの位置
とした。未凝固圧下水平ロール７の孔型Ｒは、178 mmと
した。鋳造速度は、1.55〜1.65m/min 、スプレー冷却比
水量は0.10 l/kg・steel とした。鋳造鋼種は [C]＝1.0
％鋼とした。The rolling position of the unsolidified rolling horizontal rolls 7, 7 was 23 m from the melt meniscus, and the rolling position of the forming vertical roll 8 was 32 m from the melt meniscus. The hole type R of the horizontal roll 7 under unsolidified pressure was 178 mm. The casting speed was 1.55 to 1.65 m / min, and the spray cooling water volume was 0.10 l / kg · steel. Cast steel grade [C] = 1.0
% Steel.
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１において、実施例１〜実施例５は、い
ずれも、本発明にしたがって、鋳造速度に応じた適正な
未凝固圧下量を行ったため、いずれも成形圧延後の鋳片
厚みを178 mmとすることができ、一対の成形用垂直ロー
ル８、８の隙間からの鋳片４の噛み出し量は０mmと良好
であった。In Table 1, in Examples 1 to 5, all the unsolidified rolling reductions according to the casting speed were performed in accordance with the present invention. mm, and the amount of biting of the cast slab 4 from the gap between the pair of forming vertical rolls 8 was as good as 0 mm.
【００３２】これに対し、比較例１〜比較例５は、いず
れも、鋳造速度の変化に拘わらず、未凝固圧下量を一定
としたため、適正な未凝固圧下量ではなく、成形圧延後
の鋳片４には一対の成形用垂直ロール８、８の隙間から
の噛み出しが発生し、製管不可能な形状のビレット４'
となった。On the other hand, in Comparative Examples 1 to 5, the unsolidified rolling reduction was constant irrespective of the change in casting speed. The piece 4 is bitten out of the gap between the pair of forming vertical rolls 8, 8, and the billet 4 ′ has a shape that cannot be formed.
It became.
【００３３】[0033]
【発明の効果】以上説明したように、本発明によれば、
丸ビレット鋳片の中心偏析を低減できるとともに中心ポ
ロシティを消滅でき、鋳込速度を変動させた場合にも所
望の真円度を確保することができた。かかる効果を有す
る本発明の意義は、極めて著しい。As described above, according to the present invention,
The center segregation of the round billet slab could be reduced, the center porosity could be eliminated, and the desired roundness could be secured even when the casting speed was varied. The significance of the present invention having such an effect is extremely remarkable.
【図面の簡単な説明】[Brief description of the drawings]
【図１】実施形態における、連続鋳造による丸ビレット
鋳片の製造工程を模式的に示す説明図である。FIG. 1 is an explanatory view schematically showing a manufacturing process of a round billet slab by continuous casting in an embodiment.
【図２】図１における鋳片の横断面形状を示す説明図で
あり、図２(a) は図１におけるＡ−Ａ断面図、図２(b)
は図１におけるＢ−Ｂ断面図、図２(c) は図１における
Ｃ−Ｃ断面図である。FIG. 2 is an explanatory view showing a cross-sectional shape of a slab in FIG. 1; FIG. 2 (a) is a cross-sectional view taken along line AA in FIG. 1;
2 is a sectional view taken along the line BB in FIG. 1, and FIG. 2 (c) is a sectional view taken along the line CC in FIG.
【図３】厚み戻り量が大き過ぎて、鋳片の目標径を超え
た状況の一例を模式的に示す説明図である。FIG. 3 is an explanatory diagram schematically showing an example of a situation where the thickness return amount is too large and exceeds a target diameter of a slab.
【図４】直径 225mmの鋳片から直径178 mmの丸ビレット
鋳片を連続鋳造により製造する際の、成形時の鋳込速度
(m/min) と、鋳片厚み戻り量(mm)との関係を示すグラフ
である。[Fig. 4] Casting speed during molding in the production of a 178 mm diameter round billet slab by continuous casting from a 225 mm diameter slab.
4 is a graph showing the relationship between (m / min) and the slab thickness return (mm).
４ 連続鋳造鋳片 ４' 丸ビレット鋳片 ７ 未凝固圧下水平ロール ８ 成形用垂直ロール ｄ1 短径 ｄ2 直径4 continuous casting slab 4 'round billet slab 7 unsolidified rolling horizontal roll 8 forming vertical roll d 1 minor d 2 the diameter
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平10−175049（ＪＰ，Ａ) 特開 平７−108358（ＪＰ，Ａ) 特開 平９−201601（ＪＰ，Ａ) 特開 平10−166124（ＪＰ，Ａ) 特開 平10−146651（ＪＰ，Ａ) 特開 平10−249490（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 11/00 B22D 11/128 350 B22D 11/20 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-175049 (JP, A) JP-A-7-108358 (JP, A) JP-A-9-201601 (JP, A) JP-A-10-108 166124 (JP, A) JP-A-10-146651 (JP, A) JP-A-10-249490 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B22D 11/00 B22D 11 / 128 350 B22D 11/20
Claims (2)
が略円形である連続鋳造鋳片を、１組以上の一対の水平
ロールで所定の圧下量で圧下することにより、横断面を
略楕円形とした後、１組以上の一対の孔型の垂直ロール
で圧下することにより、丸ビレット鋳片を製造する際
に、 鋳造速度を増加させる場合には、前記略楕円形を有する
前記連続鋳造鋳片の短径と、前記丸ビレット鋳片の直径
との偏差の増加分に応じて前記水平ロールの圧下量を前
記所定の圧下量よりも増加して圧下を行い、 鋳造速度を減少させる場合には、前記偏差の減少分に応
じて前記水平ロールの圧下量を前記所定の圧下量よりも
減少して圧下を行うことを特徴とする連続鋳造による丸
ビレット鋳片の製造方法。1. A continuous cast slab having an unsolidified portion therein and having a substantially circular cross section is reduced by a predetermined reduction amount by one or more pairs of horizontal rolls, so that the cross section is substantially elliptical. When the casting speed is increased by producing a round billet slab by rolling down with one or more pairs of vertical rolls having a hole shape after forming, the continuous casting having the substantially elliptical shape is used. When reducing the casting speed by increasing the reduction amount of the horizontal roll from the predetermined reduction amount according to the increase in the deviation between the short diameter of the slab and the diameter of the round billet slab, and reducing the casting speed. The method of manufacturing a round billet slab by continuous casting, wherein the reduction amount of the horizontal roll is reduced from the predetermined reduction amount in accordance with the decrease amount of the deviation.
が略円形である連続鋳造鋳片を、１組以上の一対の垂直
ロールで所定の圧下量で圧下することにより、横断面を
略楕円形とした後、１組以上の一対の孔型の水平ロール
で圧下することにより、丸ビレット鋳片を製造する際
に、 鋳造速度を増加させる場合には、前記略楕円形を有する
前記連続鋳造鋳片の短径と、前記丸ビレット鋳片の直径
との偏差の増加分に応じて前記垂直ロールの圧下量を前
記所定の圧下量よりも増加して圧下を行い、 鋳造速度を減少させる場合には、前記偏差の減少分に応
じて前記垂直ロールの圧下量を前記所定の圧下量よりも
減少して圧下を行うことを特徴とする連続鋳造による丸
ビレット鋳片の製造方法。2. A continuous cast slab having an unsolidified portion therein and having a substantially circular cross section is reduced by a predetermined reduction amount by one or more pairs of vertical rolls, so that the cross section is substantially elliptical. When the round billet slab is manufactured by lowering it with one or more pairs of horizontal rolls of a hole after forming the shape, when increasing the casting speed, the continuous casting having the substantially elliptical shape is used. When reducing the casting speed by increasing the reduction amount of the vertical roll from the predetermined reduction amount according to the increase in the deviation between the short diameter of the slab and the diameter of the round billet slab, and reducing the casting speed. The method of manufacturing a round billet slab by continuous casting, wherein the reduction amount of the vertical roll is reduced from the predetermined reduction amount according to the decrease in the deviation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36316598A JP3348667B2 (en) | 1998-12-21 | 1998-12-21 | Manufacturing method of round billet slab by continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36316598A JP3348667B2 (en) | 1998-12-21 | 1998-12-21 | Manufacturing method of round billet slab by continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000176607A JP2000176607A (en) | 2000-06-27 |
| JP3348667B2 true JP3348667B2 (en) | 2002-11-20 |
Family
ID=18478657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36316598A Expired - Fee Related JP3348667B2 (en) | 1998-12-21 | 1998-12-21 | Manufacturing method of round billet slab by continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3348667B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY172868A (en) | 2013-06-20 | 2019-12-13 | Nippon Steel Corp | Method for continuously casting slab |
-
1998
- 1998-12-21 JP JP36316598A patent/JP3348667B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000176607A (en) | 2000-06-27 |
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