JP3257224B2 - Continuous casting method - Google Patents

Continuous casting method

Info

Publication number
JP3257224B2
JP3257224B2 JP01577294A JP1577294A JP3257224B2 JP 3257224 B2 JP3257224 B2 JP 3257224B2 JP 01577294 A JP01577294 A JP 01577294A JP 1577294 A JP1577294 A JP 1577294A JP 3257224 B2 JP3257224 B2 JP 3257224B2
Authority
JP
Japan
Prior art keywords
slab
center
reduction
flat
continuous casting
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 - Lifetime
Application number
JP01577294A
Other languages
Japanese (ja)
Other versions
JPH07204812A (en
Inventor
廉 森井
静則 早川
佳夫 稲垣
高橋  元
Original Assignee
大同特殊鋼株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 大同特殊鋼株式会社 filed Critical 大同特殊鋼株式会社
Priority to JP01577294A priority Critical patent/JP3257224B2/en
Publication of JPH07204812A publication Critical patent/JPH07204812A/en
Application granted granted Critical
Publication of JP3257224B2 publication Critical patent/JP3257224B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【産業上の利用分野】この発明は連続鋳造方法に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting method.
【0002】[0002]
【従来の技術】連続鋳造方法は、歩留りが良好且つ分塊
工程が不要で生産性が高いという大きな利点を有してお
り、溶鋼から直接スラブ,ブルーム,ビレット等の最終
鋳片を連続的に製造できる鋳造方法として広く実施され
ている。
2. Description of the Related Art The continuous casting method has the great advantages that the yield is good, the lumping step is unnecessary, and the productivity is high, and the final slabs such as slabs, blooms, billets, etc. are continuously produced directly from molten steel. It is widely used as a casting method that can be manufactured.
【0003】ところでこの連続鋳造方法にて溶鋼の鋳造
を行った場合、鋳片の中心部にC,P,S等が偏析(濃
化)する問題があり、このため偏析し易い成分、特に軸
受鋼,バネ鋼等Cを多く含む鋼種の場合、連続鋳造方法
の採用が困難である問題があった。この偏析を抑制する
手段として、鋳型から出た鋳片に対して軽圧下処理を施
す方法が公知である。
When molten steel is cast by this continuous casting method, there is a problem that C, P, S, etc. are segregated (concentrated) in the center of the slab, and therefore components that are easily segregated, especially bearings In the case of steels containing a large amount of C, such as steel and spring steel, there is a problem that it is difficult to adopt a continuous casting method. As a means for suppressing this segregation, a method of subjecting a slab coming out of a mold to a light reduction treatment is known.
【0004】鋳片中心部においてC等の成分が濃化偏析
する現象は、溶鋼の凝固が外周部から中心部に向かって
進行することに起因して生ずるものと考えられており、
特に中心部に残った液相が最終凝固する際の凝固収縮に
伴って濃化溶鋼流動が生じ、これがC等の濃化偏析につ
ながるものと考えられている。
It is considered that the phenomenon that components such as C are concentrated and segregated at the center of the slab is caused by solidification of molten steel progressing from the outer periphery toward the center.
In particular, it is considered that a concentrated molten steel flow is caused by solidification shrinkage at the time of final solidification of the liquid phase remaining in the central portion, and this leads to concentrated segregation of C and the like.
【0005】上記軽圧下処理は、鋳片中心未凝固部を少
なくとも凝固収縮時の体積減少分だけ圧縮変形させるこ
とによって、凝固収縮に伴う濃化溶鋼流動を防止し、以
て凝固時の偏析を抑制するものである。
[0005] The light rolling treatment described above prevents the flow of concentrated molten steel due to solidification shrinkage by compressively deforming the unsolidified portion of the slab at least by the volume reduction during solidification shrinkage, thereby preventing segregation during solidification. It is to suppress.
【0006】しかしながら上記軽圧下処理は中心部が未
凝固状態での圧下を前提としているため、圧下条件によ
っては未凝固界面の変形に伴う引張応力の大きさによ
り、凝固前面での割れ発生というリスクが伴うものであ
る。
[0006] However, since the above-mentioned light rolling process is based on the premise that the center portion is rolled in an unsolidified state, depending on the rolling conditions, the risk of cracking at the solidification front surface may occur due to the magnitude of tensile stress accompanying deformation of the unsolidified interface. Is accompanied.
【0007】この凝固前面での割れ発生は、割れ部に凝
固前面のC,S,P等の濃化溶鋼の侵入をもたらし、製
品段階での中心偏析と同等の有害欠陥となり得るもので
ある。
[0007] The occurrence of cracks in the solidification front surface causes the infiltration of concentrated molten steel such as C, S, and P in the solidification front surface into the cracked portion, which can be a harmful defect equivalent to the center segregation at the product stage.
【0008】従って軽圧下処理に際しては上記割れ発生
を防止するために未凝固界面に大きな引張応力を発生さ
せずに、且つ中心未凝固部を充分に体積変化(圧縮変
形)させるように効率的に鋳片を圧化処理することが必
要であり、その実現が可能な技術の確立が望まれてい
た。
[0008] Therefore, in the light rolling process, in order to prevent the above-mentioned cracks from occurring, large tensile stress is not generated at the unsolidified interface, and the central unsolidified portion is efficiently changed in volume (compression deformation). It is necessary to subject the slab to pressure treatment, and it has been desired to establish a technique capable of realizing the pressure treatment.
【0009】[0009]
【課題を解決するための手段】本発明はこのような課題
を解決するためになされたものであり、その要旨は、溶
鋼を水冷鋳型の上端開放部に注入し、これを凝固させつ
つ該鋳型の下端開放部より鋳片を連続的に引き抜く連続
鋳造方法において、前記鋳片を断面円形状に鋳造すると
ともに、中心部の溶鋼が完全凝固する前の且つ中心固相
率が0.2〜0.8の位置において該鋳片をフラット部
を有するロールの該フラット部において軽圧下処理する
ことにある。
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and the gist of the present invention is to inject molten steel into an opening at the upper end of a water-cooled mold and solidify the molten steel. In the continuous casting method of continuously drawing a slab from the lower end open portion, the slab is cast into a circular cross section, and the central solid phase ratio before the molten steel in the center is completely solidified is 0.2 to 0. .8, the slab is lightly reduced in the flat part of the roll having the flat part.
【0010】[0010]
【作用及び発明の効果】連続鋳造に際して溶鋼は、図5
に示しているように完全液相領域A、液相と固相とが混
じり合った固液混合領域Bを経て完全固相領域Cへと移
行する。本発明において中心固相率とは、鋳片の中心部
における固相の占める重量比率である(完全固相状態を
1.0としている)。中心固相率は例えば鋳片の比熱,
熱伝導率,溶湯温度等のデータを元にした伝熱計算によ
って求められる鋳片断面温度分布から推定することがで
きる。而して本発明は、上記のように固液混合領域にお
いて中心の固相率が0.2〜0.8の位置で、断面円形
状に鋳造した鋳片に対しロールのフラット部にて軽圧下
処理することを特徴としている。ここでフラット部を有
するロールとは、断面円形状鋳片に対する圧下面が全て
平面を形成し得るものであり、鋳片との接触面が平面で
あればどのような形状でも構わないものである。
Operation and Effect of the Invention During continuous casting, molten steel
As shown in (2), the phase shifts to a complete solid phase region C via a complete liquid phase region A and a solid / liquid mixed region B where a liquid phase and a solid phase are mixed. In the present invention, the center solid phase ratio is the weight ratio of the solid phase in the center of the slab (the perfect solid state is 1.0). The center solid fraction is, for example, the specific heat of the slab,
It can be estimated from the slab cross-sectional temperature distribution obtained by heat transfer calculation based on data such as thermal conductivity and molten metal temperature. Thus, the present invention provides a method for reducing the weight of a slab cast into a circular cross section at the flat portion of a roll at a position where the solid phase ratio at the center is 0.2 to 0.8 in the solid-liquid mixing region as described above. It is characterized by rolling down. Here, the roll having a flat portion is a roll whose pressing surface against a slab having a circular cross section can all form a flat surface, and may have any shape as long as a contact surface with the slab is flat. .
【0011】前述したように軽圧下処理に際しては鋳片
における内部割れ発生を防止するために未凝固界面に大
きな引張応力を発生させず、しかも中心未凝固部を充分
に体積変化(圧縮変形)させるように効率的に鋳片を圧
下処理することが必要である。
[0011] As described above, in the light rolling process, a large tensile stress is not generated at the unsolidified interface in order to prevent the occurrence of internal cracks in the slab, and the central unsolidified portion is sufficiently changed in volume (compression deformation). It is necessary to reduce the slab efficiently as described above.
【0012】そのための適正条件を見出すべく、本発明
者は図3に示しているように断面4角形状の鋳片E(3
50mm角)及び断面円形状の鋳片D(350mm丸)
に対する、ロールのフラット部を用いた軽圧下時の応
力,変形解析を、有限要素法によるコンピュータ計算に
て行い、図4(イ)〜(ハ)に示す結果を得た。
In order to find appropriate conditions therefor, the present inventor has proposed a slab E (3) having a square cross section as shown in FIG.
50 mm square) and slab D (350 mm round) with circular cross section
The analysis of stress and deformation under light pressure using the flat portion of the roll was performed by computer calculation using the finite element method, and the results shown in FIGS.
【0013】図4(イ)において横軸は鋳片に対する圧
下率、縦軸は中心の未凝固部の体積減少率を指数で示し
たものである。ここで圧下率とは圧下前後での鋳片横断
面の面積減少率を示す。一方図4(ロ)及び図4(ハ)
は、圧下率を変化させた場合に発生する未凝固界面での
X軸方向(軸直角方向)及びZ軸方向(軸方向)の引張
応力の大きさをそれぞれ示している。
In FIG. 4A, the abscissa indicates the rolling reduction relative to the cast slab, and the ordinate indicates the volume reduction rate of the central unsolidified portion as an index. Here, the rolling reduction refers to the area reduction rate of the slab cross section before and after the rolling. 4 (b) and 4 (c)
Indicates the magnitude of the tensile stress in the X-axis direction (perpendicular to the axis) and the Z-axis direction (axial direction) at the unsolidified interface generated when the rolling reduction is changed.
【0014】これらの結果は、中心未凝固部における同
じ体積変化率を得るのに必要な圧下率は、断面円形の鋳
片Dと断面4角形の鋳片Eとで著しく異なっているこ
と、即ち断面円形の鋳片Dの方が断面4角形の鋳片Eに
対し著しく少なくてすむことを示している。
These results indicate that the reduction required to obtain the same rate of volume change in the center unsolidified portion is significantly different between a slab D having a circular cross section and a slab E having a rectangular cross section. This shows that the slab D having a circular cross section requires significantly less than the slab E having a square cross section.
【0015】また未凝固界面に生ずる引張応力について
は、中心部における体積変化率を同じとした場合、図4
(ロ),(ハ)の結果から、断面円形の鋳片Dの方が断
面4角形の鋳片Eに比べて著しく小さいことが判る。
Regarding the tensile stress generated at the unsolidified interface, when the volume change rate at the center is the same, FIG.
From the results (b) and (c), it can be seen that the slab D having a circular cross section is significantly smaller than the slab E having a square cross section.
【0016】即ちこれらの結果から、鋳片を断面円形に
鋳造し且つロールのフラット部を用いて軽圧下を行った
場合において、少ない圧下率でまた未凝固界面に発生す
る引張応力を小さく抑えつつ、中心未凝固部を効率的に
体積減少させ得ることが判る。
That is, from these results, when the slab is cast into a circular cross-section and light reduction is performed using the flat portion of the roll, the tensile stress generated at the unsolidified interface can be reduced with a small reduction ratio. It can be seen that the central unsolidified portion can be efficiently reduced in volume.
【0017】本発明はこのような知見の下になされたも
のであって、かかる本発明によれば、鋳片における引張
応力の発生を小さく抑え、割れの発生を防止しつつC等
の偏析を防止でき、鋳片の品質を高めることができる。
The present invention has been made under such knowledge, and according to the present invention, the occurrence of tensile stress in a cast slab is suppressed to a small value, and segregation of C and the like is prevented while preventing the occurrence of cracks. Can be prevented and the quality of the slab can be improved.
【0018】本発明はC%が0.5%以上の鋼種に適用
して特に効果の大きいものである。
The present invention is particularly effective when applied to steel types having a C% of 0.5% or more.
【0019】勿論これよりもC%の少ない鋼種に対して
も適用可能であり、この場合においても鋳片における引
張応力を小さく抑えつつ効率的に中心部を変形させ得て
偏析を防止できる効果を奏し得る。本発明は上記軽圧下
を中心固相率0.2〜0.8の位置で行うことを重要な
特徴としている。
Of course, the present invention can be applied to a steel type having a smaller C% than this. In this case as well, the effect of being able to efficiently deform the central portion while suppressing the tensile stress in the slab and to prevent segregation is obtained. I can play. An important feature of the present invention is that the above-mentioned light pressure reduction is performed at the position of the central solid fraction of 0.2 to 0.8.
【0020】本発明において軽圧下を中心固相率0.2
〜0.8の位置で行うようにしているのは、中心固相率
が0.8よりも高い位置で圧下処理を行っても、この段
階では中心部の液相が流動性をほぼ喪失しているため軽
圧下による充分な効果が得られないことによるものであ
り、また0.2より小さい位置では逆に液相の占める率
が高すぎ、流動性が高すぎて同じく軽圧下による充分な
効果が得られないことによる。
In the present invention, the center solid phase ratio is 0.2 at light pressure.
The reason for performing at the position of ~ 0.8 is that even if the reduction treatment is performed at the position where the center solid phase ratio is higher than 0.8, the liquid phase at the center almost loses fluidity at this stage. This is due to the fact that a sufficient effect by light pressure reduction cannot be obtained, and at a position smaller than 0.2, on the contrary, the ratio of the liquid phase is too high, and the fluidity is too high, so that the same effect by light pressure reduction is also obtained. This is because the effect cannot be obtained.
【0021】本発明において軽圧下は割れを防止しつつ
中心部におけるC,P,S等の成分の濃化偏析を防止す
る目的で行われるもので、この意味で圧下率は1.0〜
3.0%の範囲とするのが良く、望ましくは1.5〜
2.5%の範囲である。
In the present invention, the light rolling is performed for the purpose of preventing the segregation of components such as C, P, S and the like in the central portion while preventing cracking. In this sense, the rolling reduction is 1.0 to 1.0.
The range is preferably 3.0%, and more preferably 1.5 to
It is in the range of 2.5%.
【0022】[0022]
【実施例】次に本発明の実施例を詳述する。 〈実施例1〉C含有量1.0%のSUJ2材を鋳片の断
面形状が円形状、太さが350mmφ、引抜速度0.4
m/分の条件で連続鋳造した。
Next, embodiments of the present invention will be described in detail. <Example 1> A SUJ2 material having a C content of 1.0% was cast with a circular cross section, a thickness of 350 mmφ, and a drawing speed of 0.4.
Continuous casting was performed under the conditions of m / min.
【0023】その際、中心固相率0.4〜0.5の位置
で、フラットロールを上下2段に配置して成る2段ロー
ルを用いて且つ鋳片の圧下率が2%となるように軽圧下
処理した。尚ロールはフラット部があればよく、V孔型
を有するロールでもフラット部が存在すればよい。得ら
れた鋳片の断面におけるC量を分析したところ、図1
(イ)に示す結果が得られ、内部割れも皆無であった。
At this time, a two-stage roll in which flat rolls are arranged in two upper and lower stages at a position of 0.4 to 0.5 of the center solid phase ratio is used, and the rolling reduction of the slab is 2%. Was lightly reduced. The roll may have a flat portion, and a roll having a V-hole shape may have a flat portion. Analysis of the C content in the cross section of the obtained slab showed that FIG.
The result shown in (a) was obtained, and there was no internal crack.
【0024】一方、比較のために上記軽圧下処理を行わ
なかった場合の鋳片(断面円形状鋳片)においても同様
にCの分析を行ったところ、図1(ロ)に示す結果が得
られた。
On the other hand, for comparison, C was similarly analyzed on a slab (a slab having a circular cross section) in which the above light reduction treatment was not performed, and the result shown in FIG. 1 (b) was obtained. Was done.
【0025】これらの結果から、鋳片を断面円形状に鋳
造し且つフラットロールを用いて軽圧下を施すことによ
り、内部割れを発生させることなく中心部の偏析を良好
に抑制できることが判る。
From these results, it can be seen that by casting the slab into a circular cross section and applying a slight reduction using a flat roll, segregation at the center can be favorably suppressed without causing internal cracks.
【0026】<実施例2>C含有量0.6%のSUP7
材について実施例1と同様の条件で連続鋳造を行い、得
られた鋳片の断面におけるC量を調べたところ図2
(イ)の結果が得られ、且つ内部割れも皆無であった。
尚図2(ロ)は軽圧下処理を行わなかった場合の結果で
ある。
<Example 2> SUP7 having a C content of 0.6%
The material was subjected to continuous casting under the same conditions as in Example 1, and the C content in the cross section of the obtained slab was examined.
The result of (a) was obtained, and there was no internal crack.
FIG. 2B shows the result when the light reduction process was not performed.
【0027】この結果から、SUP7材においても鋳片
の断面形状を円形とし、これに対してフラットロールを
用いて且つ中心固相率0.2〜0.8の位置で軽圧下処
理を施すことにより、良好に中心部のCの偏析を抑制で
きることが判る。
From these results, it is found that the SUP7 material also has a circular cross-sectional shape of the slab, and that the slab is subjected to a light rolling treatment using a flat roll at the position of the central solid phase ratio of 0.2 to 0.8. Thus, it can be seen that the segregation of C at the center can be favorably suppressed.
【0028】以上本発明の実施例を詳述したがこれはあ
くまで一例示であり、本発明は他の種々材料の連続鋳造
に際して適用可能であるなど、その主旨を逸脱しない範
囲において様々な変更を加えた態様で実施可能である。
Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied to continuous casting of other various materials, and various changes can be made without departing from the gist of the present invention. It can be implemented in an added mode.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の一実施例において得られた鋳片の断面
のC量の分析結果を、軽圧下を行わなかった場合との比
較において示す図である。
FIG. 1 is a diagram showing an analysis result of a C amount of a cross section of a cast slab obtained in one example of the present invention, in comparison with a case where light reduction was not performed.
【図2】本発明の他の実施例において得られた鋳片の断
面のC量の分析結果を、軽圧下を行わなかった場合との
比較において示す図である。
FIG. 2 is a view showing an analysis result of a C amount of a cross section of a cast slab obtained in another example of the present invention, in comparison with a case where light reduction was not performed.
【図3】本発明の軽圧下の効果を確認するための試験の
方法を示す説明図である。
FIG. 3 is an explanatory diagram showing a test method for confirming the effect of light reduction under the present invention.
【図4】同試験にて得られた結果を示す図である。FIG. 4 is a diagram showing the results obtained in the same test.
【図5】本発明において軽圧下を行う位置を説明するた
めの説明図である。
FIG. 5 is an explanatory diagram for explaining a position where light reduction is performed in the present invention.
【符号の説明】[Explanation of symbols]
A 完全液相領域 B 固液混合領域 C 完全固相領域 D 断面円形状鋳片 E 断面4角形状鋳片 A Complete liquid phase region B Solid-liquid mixed region C Complete solid phase region D Circular cast slab E Square slab slab
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平7−108358(JP,A) 特開 平5−337510(JP,A) 特開 平3−155441(JP,A) 特開 平4−17948(JP,A) 特開 昭50−85523(JP,A) 特開 平3−124352(JP,A) 特開 昭62−275556(JP,A) 特開 昭62−158555(JP,A) 特開 平3−198964(JP,A) 特開 昭63−215353(JP,A) 特開 平3−138056(JP,A) 特開 平1−162551(JP,A) 特開 平6−142863(JP,A) 特開 平3−110001(JP,A) 特公 昭59−16862(JP,B2) (58)調査した分野(Int.Cl.7,DB名) B22D 11/128 350 B22D 11/00 ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-7-108358 (JP, A) JP-A-5-337510 (JP, A) JP-A-3-155441 (JP, A) JP-A-4-108 17948 (JP, A) JP-A-50-85523 (JP, A) JP-A-3-124352 (JP, A) JP-A-62-275556 (JP, A) JP-A-62-158555 (JP, A) JP-A-3-198964 (JP, A) JP-A-63-215353 (JP, A) JP-A-3-138056 (JP, A) JP-A-1-162551 (JP, A) JP-A-6-1422863 (JP, A) JP-A-3-110001 (JP, A) JP-B-59-16862 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) B22D 11/128 350 B22D 11 / 00

Claims (1)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】 溶鋼を水冷鋳型の上端開放部に注入し、
    これを凝固させつつ該鋳型の下端開放部より鋳片を連続
    的に引き抜く連続鋳造方法において前記鋳片を断面円形
    状に鋳造するとともに、中心部の溶鋼が完全凝固する前
    の且つ中心固相率が0.2〜0.8の位置において該鋳
    片をフラット部を有するロールの該フラット部において
    軽圧下処理することを特徴とする連続鋳造方法。
    1. Inject molten steel into an upper end opening of a water-cooled mold,
    In a continuous casting method in which the slab is continuously drawn from the lower end open portion of the mold while solidifying the slab, the slab is cast into a circular cross-section, and the central solid phase ratio before the molten steel in the center is completely solidified. Wherein the cast slab is lightly reduced at the flat portion of a roll having a flat portion at a position of 0.2 to 0.8.
JP01577294A 1994-01-14 1994-01-14 Continuous casting method Expired - Lifetime JP3257224B2 (en)

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JP01577294A JP3257224B2 (en) 1994-01-14 1994-01-14 Continuous casting method
DE1995620966 DE69520966T2 (en) 1994-01-14 1995-01-05 Process for the continuous casting of steels
EP19950300052 EP0663250B1 (en) 1994-01-14 1995-01-05 Continuous casting method for steels

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JPH07204812A JPH07204812A (en) 1995-08-08
JP3257224B2 true JP3257224B2 (en) 2002-02-18

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JP3367332B2 (en) * 1996-05-15 2003-01-14 日本鋼管株式会社 Manufacturing method of difficult-to-work seamless steel pipe
KR20000008005A (en) * 1998-07-09 2000-02-07 이구택 Continuous casting method in which central defect of slab decreases
CN101648212B (en) * 2009-09-15 2011-08-31 邢台钢铁有限责任公司 Bloom continuous casting dynamic soft reduction process for prestressed steel SWRH82B
CN107000045B (en) * 2014-12-24 2019-04-26 杰富意钢铁株式会社 The continuous casing of steel
BR102015009492B1 (en) * 2015-01-30 2021-05-04 Jfe Steel Corporation continuous steel casting method
CN108817338B (en) * 2018-07-06 2020-01-24 青岛特殊钢铁有限公司 Continuous casting and rolling production process suitable for high-strength spring flat steel

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US4134440A (en) * 1974-09-16 1979-01-16 Nippon Kokan Kabushiki Kaisha Method of continuously casting steel
JPS5939225B2 (en) * 1978-02-13 1984-09-21 Nippon Kokan Kk
JPH0256982B2 (en) * 1984-03-01 1990-12-03 Nippon Steel Corp
DE3676753D1 (en) * 1985-08-03 1991-02-14 Nippon Steel Corp CONTINUOUS METHOD.
JPS635859A (en) * 1986-06-25 1988-01-11 Nippon Steel Corp Continuous casting method for high silicon steel
JPH01273658A (en) * 1988-04-27 1989-11-01 Sumitomo Metal Ind Ltd Method for continuously casting steel giving rolling reduction
JP2964560B2 (en) * 1989-08-16 1999-10-18 大同特殊鋼株式会社 Vertical continuous casting equipment

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DE69520966D1 (en) 2001-06-28
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DE69520966T2 (en) 2001-11-15
EP0663250B1 (en) 2001-05-23

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