JP3318451B2 - Continuous casting method of multilayer slab - Google Patents
Continuous casting method of multilayer slabInfo
- Publication number
- JP3318451B2 JP3318451B2 JP30401794A JP30401794A JP3318451B2 JP 3318451 B2 JP3318451 B2 JP 3318451B2 JP 30401794 A JP30401794 A JP 30401794A JP 30401794 A JP30401794 A JP 30401794A JP 3318451 B2 JP3318451 B2 JP 3318451B2
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- JP
- Japan
- Prior art keywords
- molten metal
- mold
- electromagnet
- continuous casting
- lubricant
- 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.)
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- Continuous Casting (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、表層と内層の組成が異
なる複層鋳片の連続鋳造方法、特に、均一な表層成分分
布の複層鋳片を得ることができる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 of a multilayer slab having different compositions of a surface layer and an inner layer, and more particularly to a continuous casting method capable of obtaining a multilayer slab having a uniform surface layer component distribution.
【０００２】[0002]
【従来の技術】従来、内層及び外層の成分組成の異なる
複層鋳片を連続鋳造する技術としては、例えば特公平３
−２０２９５号公報に示す如く、１個の矩形断面鋳造鋳
型の下方に、鋳片の厚みを横切る方向の直流磁束を鋳片
に付与する電磁石を設け、該電磁石により形成した静磁
場帯を境界としてその上下に、組成の異なる金属を２本
の注入ノズルにより別個に注入してそれぞれ凝固させて
複層鋳片を製造する方法が知られている。2. Description of the Related Art Conventionally, as a technique for continuously casting multilayer cast pieces having different component compositions of an inner layer and an outer layer, for example, Japanese Patent Publication No.
As shown in JP-A-20295, an electromagnet is provided below a single rectangular cross-section casting mold to apply a DC magnetic flux in a direction crossing the thickness of the slab to the slab, and a static magnetic field band formed by the electromagnet is used as a boundary. There is known a method of manufacturing a multilayer slab by separately injecting metals having different compositions from above and below using two injection nozzles and solidifying each of them.
【０００３】しかしながら、この従来の複層鋳片の連続
鋳造方法においては、２中間鍋・２ノズル方式であり、
かつ、２本のノズルのうち静磁場帯の下方へ注入するた
めのノズルが非常に長尺のものとなるため、設備面の負
担が大きいと同時に操業面でも細かい調整制御が要求さ
れ、非常に面倒である。また、得られた鋳片の表層部の
品質においても十分満足すべきものが得られなかった。[0003] However, in this conventional method for continuous casting of a multilayer slab, a two intermediate pot and two nozzle system is used.
In addition, since the nozzle for injecting below the static magnetic field zone among the two nozzles is very long, the load on the equipment is large and at the same time, fine adjustment control is required also on the operation side. It is troublesome. In addition, the obtained cast slab was not sufficiently satisfactory in surface layer quality.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、このような
従来の鋳造方式の問題点を解消し、１個の中間鍋と１本
の鋳造ノズルによって、より簡便な設備と操作で均一な
表層成分分布をもつ複層鋳片が得られる連続鋳造方法を
提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves such a problem of the conventional casting method, and provides a uniform surface layer with simpler equipment and operation by using one intermediate pot and one casting nozzle. It is an object of the present invention to provide a continuous casting method capable of obtaining a multilayer slab having a component distribution.
【０００５】[0005]
【課題を解決するための手段】本発明の要旨は次の通り
である。 （１）上下方向に一定周期で振動する水冷鋳型に溶融金
属を潤滑剤と共に注入し、鋳型を包囲して配置した電磁
コイルにより鉛直面内に電磁力を付与すると共に、この
電磁コイルの下方の鋳型設置範囲内に配置した電磁石に
て水平方向の成分の幅方向に均一な静磁場を付与する溶
融金属の連続鋳造方法において、前記電磁石より上部の
溶融金属プール内では、潤滑剤中に包含した溶質元素を
電磁コイルにより、溶融金属の周囲から鋳型中心に向か
うピンチ力により生じる均一な攪拌流によって、該上部
プール内で良好に溶融金属と攪拌混合させ凝固させて表
層部を形成させ、さらにジュール熱により上部プールの
温度補償作用も果たすと共に、電磁石より下部の溶融金
属プールでは、溶質元素の混入を該電磁石で防止しつつ
凝固させて内層部を形成させることを特徴とする複層鋳
片の連続鋳造方法。 （２）溶質元素を潤滑剤中に包含させることに代えて、
ワイヤ状に固化させて供給することよりなる上記（１）
記載の連続鋳造方法。The gist of the present invention is as follows. (1) A molten metal is injected together with a lubricant into a water-cooled mold vibrating at a constant period in a vertical direction, and an electromagnetic force is provided in a vertical plane by an electromagnetic coil disposed around the mold, and a magnetic force below the electromagnetic coil is provided. In the continuous casting method of molten metal for applying a uniform static magnetic field in the width direction of the horizontal component with the electromagnet arranged in the mold installation range, in the molten metal pool above the electromagnet, contained in the lubricant The solute element is moved from the periphery of the molten metal to the center of the mold by the electromagnetic coil.
The upper agitating flow generated by the pinch force
Mix well with the molten metal in the pool and solidify it to form a surface layer .
A method for continuously casting a multilayer slab, wherein the inner layer is formed by solidifying while preventing a solute element from being mixed by the electromagnet in a molten metal pool below the electromagnet, while also performing a temperature compensating action . (2) Instead of including the solute element in the lubricant,
The above (1), which is supplied by solidifying in a wire form.
The continuous casting method as described.
【０００６】[0006]
【作用】以下本発明の詳細を説明する。図１は本発明の
鋳造方法を好適に実施し得るための鋳造設備例を示し、
１は上下方向に一定周期の振動を付与されかつ水冷構造
に構成した矩形断面の連続鋳造用鋳型、２は該鋳型内に
中間鍋（例えば、タンディッシュ）３からの溶融金属４
を注入するための浸漬ノズル、５は鋳型１を取り囲み鋳
型内の溶融金属３に鉛直面内の成分を有する電磁力を付
与するための電磁コイル、６は該電磁コイル５の下方に
て鋳型長辺に沿って水平方向に配置した電磁石、７は鋳
型内の溶融金属上に投入される潤滑剤である。The details of the present invention will be described below. FIG. 1 shows an example of a casting facility for suitably implementing the casting method of the present invention,
Reference numeral 1 denotes a continuous casting mold having a rectangular cross section which is provided with vibrations of a predetermined cycle in a vertical direction and has a water-cooled structure, and 2 denotes a molten metal 4 from an intermediate pan (for example, a tundish) 3 in the mold.
No. 5 is an immersion nozzle for injecting, 5 is an electromagnetic coil for surrounding the mold 1 and applying an electromagnetic force having a component in a vertical plane to the molten metal 3 in the mold, 6 is a mold length below the electromagnetic coil 5. Electromagnets 7 arranged horizontally along the sides are lubricants injected onto the molten metal in the mold.
【０００７】電磁コイル５は単相交流を印加して溶融金
属の周囲から鋳型中心に向かう電磁力（ピンチ力）を与
えて、溶融金属のメニスカス部の上面を凸状に盛り上
げ、鋳型と凝固シェル間に潤滑剤７が良好に入り込むよ
うにすると同時に、後述するように、攪拌流をも生じさ
せる。また、下方の電磁石６は溶融金属の厚み方向に均
一な直流磁束による静磁場を付与し、電磁ブレーキの作
用を果たすもので、この電磁石の位置により溶融金属は
上部プールＰ1 及び下部プールＰ2 に分けられる。本発
明ではこの状態で潤滑剤７中に包含する形で適宜の溶質
元素８を添加するものである。溶質元素としては、ベー
スとなる注入溶融金属に添加して所望の材質の外層金属
となるために必要な元素であり、例えば、Ｃ，Ｓｉ，Ｍ
ｎ等が挙げられる。The electromagnetic coil 5 applies a single-phase alternating current to apply an electromagnetic force (pinch force) from the periphery of the molten metal toward the center of the mold, thereby raising the upper surface of the meniscus portion of the molten metal to a convex shape, and forming the mold and the solidified shell. At the same time, the lubricant 7 is well introduced into the gap, and at the same time, a stirring flow is generated as described later. Further, the electromagnets 6 The lower impart static magnetic field by uniform DC magnetic flux in the thickness direction of the molten metal, fulfills the action of the electromagnetic brake, the molten metal by the position of the electromagnet upper pool P 1 and the lower pool P 2 Divided into In the present invention, in this state, an appropriate solute element 8 is added so as to be included in the lubricant 7. The solute element is an element necessary to be added to the injected molten metal serving as a base to become an outer layer metal of a desired material. For example, C, Si, M
n and the like.
【０００８】図１の装置において、ノズル２から注入さ
れた溶融金属４は、幅方向に均一な電磁石の電磁ブレー
キ作用により下部プールＰ2 において均一なプラグフロ
ーとなる。一方、上部プールＰ1 に添加した溶質元素８
は、鋳型１周囲の電磁コイル５のピンチ力により生じる
均一な攪拌流Ｋによって、該上部プールＰ1 内で良好に
溶融金属と混合され、凝固シェルを形成する。この溶質
元素８は電磁石６のブレーキ作用によってつくられる静
磁場の界面Ｂから下方へは混入されない。従って、界面
Ｂから下の下部プールＰ2 では、上部プールＰ1 とは異
なる成分（溶質元素８が包含されない成分）となり、そ
の凝固シェルが先の上部プールＰ1 にて既に形成された
凝固シェルの内側に形成される。なお、電磁コイル５は
ジュール熱により上部プールの温度補償作用も果たす。
図１の９が表層の凝固部、１０が内層の凝固部を表して
いる。[0008] In the apparatus of FIG. 1, the molten metal 4 which is injected from the nozzle 2, a uniform plug flow in the lower pool P 2 by the electromagnetic braking action of the uniform electromagnet in the width direction. On the other hand, the solute element 8 added to the upper pool P 1
Is the uniform stirred flow K generated by the pinch force of the mold 1 surrounding the electromagnetic coil 5, it is mixed with good molten metal in the upper pool P 1, to form a solidified shell. The solute element 8 is not mixed downward from the interface B of the static magnetic field created by the braking action of the electromagnet 6. Therefore, the lower pool P 2 below from the interface B, coagulation different components (component solute elements 8 is not included) and the upper pool P 1, the solidified shell has already been formed in the previous upper pool P 1 Shell Is formed inside. In addition, the electromagnetic coil 5 also performs the temperature compensation function of the upper pool by Joule heat.
In FIG. 1, reference numeral 9 denotes a solidified portion of the surface layer, and reference numeral 10 denotes a solidified portion of the inner layer.
【０００９】なお、上記の複層鋳片の鋳造に際しては、
引き抜かれる金属と凝固金属とのマスバランスがとれる
ように、鋳造速度を調整することが必要である。In casting the above-mentioned multilayer slab,
It is necessary to adjust the casting speed so that the mass of the drawn metal and the solidified metal can be balanced.
【００１０】また、図示の例では溶質元素８を潤滑剤中
に包含させて添加させたが、本発明においては、これに
代えて溶質元素をワイヤ状に固化させた固体状態で直接
溶融金属中或いはノズルを介して添加させることもでき
る。このワイヤ状の添加方式では、溶質元素を電磁石６
の下方の下部プールＰ2 側に添加することも可能とな
る。In the illustrated example, the solute 8 is contained in the lubricant and added. However, in the present invention, the solute is solidified in the form of a wire in the solid state instead of the solute. Alternatively, it can be added via a nozzle. In this wire-shaped addition method, a solute element is
It is possible to add a to the lower pool P 2 side of the lower.
【００１１】[0011]
鋳造条件 ・鋳造材料：低炭素鋼 ・鋳型サイズ；２５０mm厚×１０００mm幅×８００mm高
さ ・鋳型振動：ストローク ６mm、サイクル １５０cpm ・添加元素：炭素（潤滑剤パウダー中に粒子で添加） ・鋳造速度：１ｍ／分 潤滑剤 ・主成分 Ｃ−ＣａＯ−ＳｉＯ2 −Ａｌ2 Ｏ3 −ＮａＦ
系 ・粘度 １ポアズ 電磁力条件 ・コイル 湯面レベルと鋳型上端−１００mmのときコイ
ル高さ 湯面レベルから下方２００mmまで ・磁場 単相交流 ６０Hz １２００ガウス（最大実効
値） 均一電磁石 コア高さ：２００mm、コア位置：メニスカスから３００
mm、最大磁束密度：３０００ガウスCasting conditions-Casting material: low carbon steel-Mold size: 250mm thickness x 1000mm width x 800mm height-Mold vibration: stroke 6mm, cycle 150cpm-Additive element: carbon (added as particles in lubricant powder)-Casting speed: 1 m / min lubricant, the main component C-CaO-SiO 2 -Al 2 O 3 -NaF
System ・ Viscosity 1 poise Electromagnetic force conditions ・ Coil height when the mold level and the top of the mold are −100 mm Coil level from the mold level to 200 mm below ・ Magnetic field Single phase alternating current 60 Hz 1200 gauss (maximum effective value) Uniform electromagnet Core height: 200 mm , Core position: 300 from meniscus
mm, maximum magnetic flux density: 3000 Gauss
【００１２】上記の条件により複層鋳片の鋳造を行った
結果、得られた複合鋳片の主成分を表１に示すと共に、
Ｃ：０．０８％以上を含有した所要の表層部が形成され
ているかを調べるため、図２にその表層厚みの分布を本
発明と比較例（電磁コイル無し）を対比して示す。As a result of casting the multilayer slab under the above conditions, the main components of the obtained composite slab are shown in Table 1, and
FIG. 2 shows the distribution of the surface layer thickness of the present invention and a comparative example (without an electromagnetic coil) in order to check whether a required surface layer portion containing C: 0.08% or more is formed.
【００１３】表１により、Ｃは表層側が内層に比し０．
０７％アップ（１％アップに約１４．０℃/tonの温度
要）、Ｓｉは同じく０．１８％アップ（１％アップに約
１．２℃/tonの温度要）、Ｍｎは０．９％アップ（１％
アップに約１．２℃/tonの温度要）している。従って、
鋳造速度が約１．７５ton/min のため、約６℃/minの温
度補償が必要であるが、無添加時鋳型内温度の上部電磁
コイルによる温度上昇が１０℃強あることから十分補償
できる。また、図２により、電磁力無し（破線）が厚み
に大きなばらつきがあるのに対し、本発明の電磁力あり
が一定厚みのものがほぼ均等に分布していることが分か
る。[0013] According to Table 1, C is 0.1% on the surface layer side compared to the inner layer.
07% up (about 14.0 ° C / ton for 1% up), Si 0.18% up (about 1.2 ° C / ton for 1% up), Mn 0.9 % Up (1%
Up to about 1.2 ° C / ton. Therefore,
Since the casting speed is about 1.75 ton / min, a temperature compensation of about 6 ° C./min is necessary, but it can be sufficiently compensated because the temperature rise in the mold by the upper electromagnetic coil when it is not added is more than 10 ° C. Further, it can be seen from FIG. 2 that there is a large variation in the thickness without the electromagnetic force (broken line), whereas those with the electromagnetic force of the present invention having a constant thickness are almost uniformly distributed.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【発明の効果】以上のごとく本発明の鋳造方法によれ
ば、通常の１中間鍋１ノズル方式の設備にて特別な操業
を行うことなく、均一な表層成分分布を有する複層鋳片
を効率よく製造することができる。As described above, according to the casting method of the present invention, it is possible to efficiently produce a multilayer slab having a uniform surface layer component distribution without performing a special operation in a normal one-pot, one-pan-type equipment. Can be manufactured well.
【図１】本発明方法を好適に実施するための鋳造設備例
を示す断面図。FIG. 1 is a sectional view showing an example of a casting facility for suitably implementing the method of the present invention.
【図２】（ａ）は本発明の実施例の効果、即ち表層部の
成分均一度を比較例と共に示す図、（ｂ）は（ａ）にお
ける横軸位置を示す図。2A is a diagram showing the effect of the embodiment of the present invention, that is, the component uniformity of the surface layer together with a comparative example, and FIG.
１ 鋳型 ２ ノズル ３ 中間鍋 ４ 溶融金属 ５ 電磁コイル ６ 均一電磁石 ７ 潤滑剤 ８ 溶質元素 ９ 表層 １０ 内層 DESCRIPTION OF SYMBOLS 1 Mold 2 Nozzle 3 Intermediate pan 4 Molten metal 5 Electromagnetic coil 6 Uniform electromagnet 7 Lubricant 8 Solute element 9 Surface layer 10 Inner layer
フロントページの続き (72)発明者 澤田 健三 千葉県富津市新富20−１ 新日本製鐵株 式会社 技術開発本部内 (56)参考文献 特開 平３−243245（ＪＰ，Ａ) 特開 平７−290195（ＪＰ，Ａ) 特開 平７−284879（ＪＰ，Ａ) 特開 平７−178521（ＪＰ，Ａ) 特開 平４−279249（ＪＰ，Ａ) 特開 平５−318063（ＪＰ，Ａ) 特公 平３−20295（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 11/00 B22D 11/04 311 B22D 11/07 B22D 11/11 B22D 11/115 B22D 11/108 Continuation of the front page (72) Inventor Kenzo Sawada 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (56) References JP-A-3-243245 (JP, A) JP-A-7 JP-A-290195 (JP, A) JP-A-7-284879 (JP, A) JP-A-7-178521 (JP, A) JP-A-4-279249 (JP, A) JP-A-5-318063 (JP, A) (JP) B-20D (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) B22D 11/00 B22D 11/04 311 B22D 11/07 B22D 11/11 B22D 11/115 B22D 11/108
Claims (2)
に溶融金属を潤滑剤と共に注入し、鋳型を包囲して配置
した電磁コイルにより鉛直面内に電磁力を付与すると共
に、この電磁コイルの下方の鋳型設置範囲内に配置した
電磁石にて水平方向の成分の幅方向に均一な静磁場を付
与する溶融金属の連続鋳造方法において、前記電磁石よ
り上部の溶融金属プール内では、潤滑剤中に包含した溶
質元素を電磁コイルにより、溶融金属の周囲から鋳型中
心に向かうピンチ力により生じる均一な攪拌流によっ
て、該上部プール内で良好に溶融金属と攪拌混合させ凝
固させて表層部を形成させ、さらにジュール熱により上
部プールの温度補償作用も果たすと共に、電磁石より下
部の溶融金属プールでは、溶質元素の混入を該電磁石で
防止しつつ凝固させて内層部を形成させることを特徴と
する複層鋳片の連続鋳造方法。1. A molten metal is injected together with a lubricant into a water-cooled mold that vibrates at a constant period in a vertical direction, and an electromagnetic force is provided in a vertical plane by an electromagnetic coil surrounding the mold, and an electromagnetic force is applied to the vertical surface. In the continuous casting method of molten metal that applies a uniform static magnetic field in the width direction of the horizontal component with the electromagnet arranged in the lower mold installation range, in the molten metal pool above the electromagnet, the lubricant The contained solute elements are transferred from the periphery of the molten metal to the mold using an electromagnetic coil.
The uniform agitated flow created by the pinch force towards the heart
Above Te, and good molten metal and mixed by stirring to coagulate in the upper pool to form a surface layer portion, further by Joule heat
A continuous casting of a multilayer slab, characterized in that the molten metal pool below the electromagnet also solidifies while preventing the mixing of solute elements with the electromagnet while forming an inner layer portion. Method.
代えて、ワイヤ状に固化させて供給することよりなる請
求項１記載の連続鋳造方法。2. The continuous casting method according to claim 1, wherein instead of including the solute element in the lubricant, the solute element is solidified and supplied in a wire shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30401794A JP3318451B2 (en) | 1994-12-07 | 1994-12-07 | Continuous casting method of multilayer slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30401794A JP3318451B2 (en) | 1994-12-07 | 1994-12-07 | Continuous casting method of multilayer slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08155590A JPH08155590A (en) | 1996-06-18 |
| JP3318451B2 true JP3318451B2 (en) | 2002-08-26 |
Family
ID=17928072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30401794A Expired - Fee Related JP3318451B2 (en) | 1994-12-07 | 1994-12-07 | Continuous casting method of multilayer slab |
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| Country | Link |
|---|---|
| JP (1) | JP3318451B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1196548C (en) * | 2000-03-09 | 2005-04-13 | 杰富意钢铁株式会社 | Production method for continuous casting cast billet |
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1994
- 1994-12-07 JP JP30401794A patent/JP3318451B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08155590A (en) | 1996-06-18 |
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