JPH01271042A - Method for continuously casting double-layer cast slab - Google Patents
Method for continuously casting double-layer cast slabInfo
- Publication number
- JPH01271042A JPH01271042A JP10055088A JP10055088A JPH01271042A JP H01271042 A JPH01271042 A JP H01271042A JP 10055088 A JP10055088 A JP 10055088A JP 10055088 A JP10055088 A JP 10055088A JP H01271042 A JPH01271042 A JP H01271042A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- slab
- cast slab
- solidified shell
- magnetic field
- 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.)
- Granted
Links
- 238000005266 casting Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 230000003068 static effect Effects 0.000 claims description 10
- 238000009749 continuous casting Methods 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 19
- 238000007654 immersion Methods 0.000 description 18
- 238000003756 stirring Methods 0.000 description 6
- 229910052737 gold Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、表面の一部又は複数個所に組成の異なる層を
形成した複層鋳片を、溶融状態から連続的に製造する方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for continuously producing a multilayer slab in which layers of different compositions are formed on a portion or multiple locations of the surface from a molten state.
連続鋳造によって複合鋼材を製造する方法として、長さ
の異なる２本の浸漬ノズルを鋳型内にある溶融金属のプ
ールに挿入し、それぞれのノズルの吐出孔位置を鋳造方
向の異なる位置に設け、異種の溶融金属を注入する方法
が、特公昭４４−２７３６１号公報で提案されている。As a method for manufacturing composite steel materials by continuous casting, two immersion nozzles of different lengths are inserted into a pool of molten metal in a mold, and the discharge holes of each nozzle are set at different positions in the casting direction. A method of injecting molten metal is proposed in Japanese Patent Publication No. 44-27361.
本発明者等も、鋳型内に注入された異種の溶融金属を静
磁場による制動力で仕切り、外層と内層との境界が明確
な複層鋳片を製造する方法を開発し、これ゛を特願昭６
１−２５２８９８号として出願した。The present inventors have also developed a method for producing a multilayer slab with a clear boundary between the outer layer and the inner layer by partitioning different types of molten metal poured into a mold using the braking force of a static magnetic field. Gansho 6
The application was filed as No. 1-252898.
第４図は、この方法を説明する概略図である。FIG. 4 is a schematic diagram illustrating this method.
鋳型Ｍ内の鋳造空間に、長さの異なる浸漬ノズル１．２
を挿入し、これら浸漬ノズル１．２からそれぞれ溶融金
属３．４を供給している。外層となる溶融金属３Ｉま、
鋳型Ｍの壁面から抜熱されて凝固シェル５となる。他方
、内層となる溶融金＠４は、この凝固シェル５を介した
抜熱によって冷却・凝固されて、凝固シェル６となる。Immersion nozzles 1.2 of different lengths are placed in the casting space in the mold M.
are inserted, and molten metal 3.4 is supplied from each of these immersion nozzles 1.2. Molten metal 3I which becomes the outer layer,
Heat is removed from the wall surface of the mold M to form a solidified shell 5. On the other hand, the molten gold @ 4 forming the inner layer is cooled and solidified by heat removal through the solidified shell 5 and becomes a solidified shell 6 .
このとき、鋳型Ｍ内で溶融金＠３．４が相互に混合する
ことを防止するため、鋳造方向に対して直角な方向に延
びる磁力線をもつ静磁場を、電磁石７又は永久磁石によ
って溶融金ｆｉ３．４に印加している。この静磁場によ
って、電磁ブレーキが働き、静磁場帯での溶融金属３．
４の流動が抑制され、混合が抑えられる。At this time, in order to prevent the molten gold @3.4 from mixing with each other in the mold M, a static magnetic field with lines of magnetic force extending in a direction perpendicular to the casting direction is applied to the molten gold fi3 by an electromagnet 7 or a permanent magnet. .4 is applied. This static magnetic field causes an electromagnetic brake to work, causing the molten metal to melt in the static magnetic field.3.
4 flow is suppressed and mixing is suppressed.
ところが、凝固シェル５．６の成長に伴って、鋳型Ｍ内
で流体が流動する空間が狭くなる。また、長尺の浸漬ノ
ズル２と凝固シェル５．６との間の距離も小さくなる。However, as the solidified shell 5.6 grows, the space in which the fluid flows within the mold M becomes narrower. The distance between the elongated submerged nozzle 2 and the solidified shell 5.6 is also reduced.
そのため、第４図に示すように浸漬ノズル２から溶融金
属４を吐出するとき、その溶融金属４で凝固シェル５．
６が洗われる。Therefore, when the molten metal 4 is discharged from the immersion nozzle 2 as shown in FIG. 4, the molten metal 4 solidifies the shell 5.
6 is washed.
浸漬ノズル２を出た直後の溶融金［４は高温であるため
、浸漬ノズル２の吐出部近傍の凝固シェル５．６の再溶
解が生じ、周方向にシェル厚の不均一となり、ひいては
表層の厚みが周方向で不均一となった鋳片が得られるこ
とになる。Since the molten metal [4 immediately after exiting the immersion nozzle 2] is at a high temperature, the solidified shell 5.6 near the discharge part of the immersion nozzle 2 re-melts, resulting in non-uniform shell thickness in the circumferential direction, and as a result, the surface layer becomes uneven. This results in a slab whose thickness is non-uniform in the circumferential direction.
そこで、本発明は、長尺の浸漬ノズルから吐出される溶
融金属に水平横方向の流動成分を与えることによって、
凝固シェルが周方向で不均一化することを防ぎ、安定し
た条件下で複層鋳片を製造することを目的とする。Therefore, the present invention provides a horizontal lateral flow component to the molten metal discharged from a long immersion nozzle.
The purpose is to prevent the solidified shell from becoming non-uniform in the circumferential direction and to produce multilayer slabs under stable conditions.
本発明の連続鋳造方法は、その目的を達成するために、
鋳型に供給された溶融金属の湯面レベルよりも下方の位
置で、鋳片全幅にわたって磁力線が延在する静磁場を印
加し、この静磁場帯を境として上下に異なる金属を供給
することにより複層鋳片を連゛続鋳造する際に、前記静
磁場帯の下方に供給される溶融金属に対して水平方向の
流動成分を与えることを特徴とする。In order to achieve the purpose of the continuous casting method of the present invention,
A static magnetic field with lines of magnetic force extending across the entire width of the slab is applied at a position below the level of the molten metal supplied to the mold, and different metals are supplied above and below the static magnetic field as a boundary. The present invention is characterized in that a horizontal flow component is applied to the molten metal supplied below the static magnetic field zone during continuous casting of layered slabs.
水平方向の流動成分を与える具体的な手段としては、側
面に吐出口を設けた浸漬ノズル、或いは鋳片又は鋳型の
回りに配置した電磁撹拌装置を使用することができる。As a specific means for imparting a horizontal flow component, it is possible to use a submerged nozzle with a discharge port on the side, or an electromagnetic stirring device placed around the slab or mold.
第１図は、長尺の浸漬ノズル２の側面に開口した吐出口
８から、溶融金属４を水平方向に流出させている状態を
示す。また、第２図は、この吐出流９を水平断面図で表
した図である。FIG. 1 shows a state in which molten metal 4 is flowing out in a horizontal direction from a discharge port 8 opened on the side surface of a long immersion nozzle 2. Moreover, FIG. 2 is a diagram showing this discharge flow 9 in a horizontal cross-sectional view.
このように、浸漬ノズル２から溶融金属４を水平方向に
吐出・旋回させることにより、鋳造方向に直交する面に
おける温度分布が均一化する。その結果、凝固シェル５
．６が均一な温度条件下で成長し、鋳片の周方向に関し
て均一な厚みをもつ外層が得られる。なお、浸漬ノズル
２からの吐出口８を必ずしも水平方向にする必要はなく
、第１図の点線で示すように若干下方に傾斜した吐出流
９となるような吐出口８を形成しても良い。In this way, by discharging and swirling the molten metal 4 from the immersion nozzle 2 in the horizontal direction, the temperature distribution in the plane perpendicular to the casting direction is made uniform. As a result, the solidified shell 5
．． 6 grows under uniform temperature conditions, and an outer layer having a uniform thickness in the circumferential direction of the slab is obtained. Note that the discharge port 8 from the immersion nozzle 2 does not necessarily have to be in a horizontal direction, and the discharge port 8 may be formed so that the discharge flow 9 is slightly inclined downward as shown by the dotted line in FIG. .
第３図は、浸漬ノズル２から流出する溶融金属４に対し
て、電磁撹拌族！１１０によって水平方向Ｆの流動成分
を与える場合を示す。この電磁撹拌装置１０は、鋳型Ｍ
の長辺Ｍｌ、 Ｍ２（第２図参照）にそれぞれ設けら
れており、溶融金＊４を水平方向に流動させる。これに
よっても、第１．２図の場合と同様に、凝固シェルの鋳
片周方向に関して均一な成長を促し、周方向に均一な外
層をもつ複層鋳片が得られる。FIG. 3 shows an electromagnetic stirring group for the molten metal 4 flowing out from the immersion nozzle 2. 110 gives a flow component in the horizontal direction F. This electromagnetic stirring device 10 has a mold M
They are provided on the long sides Ml and M2 (see Figure 2), respectively, and cause the molten gold *4 to flow horizontally. This also promotes uniform growth of the solidified shell in the circumferential direction of the slab, resulting in a multilayer slab having a uniform outer layer in the circumferential direction, as in the case of FIG. 1.2.
なお、第３図において、第１図に示したように側面に吐
出口８を開口させた浸漬ノズル２を使用することも可能
である。この場合には、電磁撹拌力の向きは、ノズル１
．２からの吐出流に逆られないように、鋳型Ｍの長辺Ｍ
＋、Ｍ２両側でそれぞれ逆方向にすることが好ましい。In addition, in FIG. 3, it is also possible to use the immersion nozzle 2 in which the discharge port 8 is opened on the side surface as shown in FIG. 1. In this case, the direction of the electromagnetic stirring force is
．． The long side M of the mold M is
It is preferable to reverse the direction on both sides of + and M2.
これによって、水平方向の旋回流を形成することができ
、より大きな効果が得られる。This makes it possible to form a horizontal swirling flow, resulting in a greater effect.
また、浸漬ノズル２から吐出される溶融金ｆｊｌｉ４が
垂直下方に流れないため、その反転流も少なくなる。ビ
たがって、溶融金属３．４の界面を乱す運動成分が減少
し、溶融金属３．４が互いに混じり合うことも抑えられ
る。その結果、得られた複層鋳片における外層と内層と
の境界も明確になり、この界面に遷移相が形成されるこ
ともない。Moreover, since the molten gold fjli4 discharged from the immersion nozzle 2 does not flow vertically downward, the reverse flow thereof is also reduced. Therefore, the motion component that disturbs the interface of the molten metal 3.4 is reduced, and the molten metal 3.4 is also prevented from mixing with each other. As a result, the boundary between the outer layer and the inner layer in the obtained multilayer slab becomes clear, and no transition phase is formed at this interface.
側面に吐出口８をもつ浸漬ノズル２から普通鋼組成をも
つ溶融金属４（融点１４９６℃）を注入し、浸漬ノズル
１からＳ Ｕ ５３０４組成をもつ溶融金属４（融点１
４５０℃）を注入して、鋳造速度１ｍ／分で肉厚２００
（社）の複層鋳片を製造した。得られた複層鋳片は、平
均厚さ２０＋ｎ＋ｎの外層をもっていた。この外層の最
大厚さは２１止で、最小厚さは１９ｍｍで、その肉厚偏
差は０．０５％に過ぎなかった。Molten metal 4 having a composition of ordinary steel (melting point 1496°C) is injected from the immersion nozzle 2 having a discharge port 8 on the side, and molten metal 4 having a composition S U 5304 (melting point 1) is injected from the immersion nozzle 1.
450℃) and cast at a casting speed of 1m/min to a wall thickness of 200℃.
(Company) manufactured multi-layer slabs. The obtained multilayer slab had an outer layer with an average thickness of 20+n+n. The maximum thickness of this outer layer was 21 mm, the minimum thickness was 19 mm, and the wall thickness deviation was only 0.05%.
これに対して、第４図に示した下端に吐出口をもつ浸漬
ノズル２を使用して、その他は同じ条件下で鋳造を行っ
たところ、得られた複層鋳片における外層の厚みは１５
〜２５ｍｍの間で変動し、その肉厚偏差も±２５％と大
きなものであった。On the other hand, when casting was carried out using the immersion nozzle 2 having a discharge port at the lower end as shown in Fig. 4 under the same conditions, the thickness of the outer layer in the obtained multi-layer slab was 15 mm.
The wall thickness varied between ~25 mm, and the wall thickness deviation was as large as ±25%.
この対比から明らかなように、内層となる溶融金属４に
対して水平方向の流動成分を与えることにより、一定し
た品質の複層鋳片を製造することができた。As is clear from this comparison, by giving a horizontal flow component to the molten metal 4 serving as the inner layer, it was possible to manufacture a multilayer slab of constant quality.
以上に説明したように、本発明においては、長尺側の浸
漬ノズルから吐出される溶融金属流に対して水平方向の
流動成分を与えることにより、その溶融金属が高温状態
のままで凝固シェルに接触することを防止している。そ
のため、凝固シェルの再溶解が抑えられ、一定した厚み
の外層をもつ複層鋳片を製造することができる。また、
水平方向の流動成分をもつ吐出流は異種の溶融金属間の
界面を乱すことが少なくなるため、異種金属相互の混合
が少なくなり、外層と内層との間に生じる界面相も極め
て薄いものとなる。このように、本発明によるとき、優
れた品質をもつ複層鋳片を安定した条件下で製造するこ
とができる。As explained above, in the present invention, by giving a horizontal flow component to the molten metal flow discharged from the long side immersion nozzle, the molten metal remains in a high temperature state and forms a solidified shell. Preventing contact. Therefore, remelting of the solidified shell is suppressed, and a multilayer slab having an outer layer of constant thickness can be manufactured. Also,
A discharge flow with a horizontal flow component is less likely to disturb the interface between different types of molten metals, so the mixing of different types of metals with each other is reduced, and the interfacial phase formed between the outer layer and the inner layer is also extremely thin. . As described above, according to the present invention, a multi-layer slab with excellent quality can be manufactured under stable conditions.
第１図は側面に吐出口を開口させた浸漬ノズルを使用し
て複層鋳片を製造している状態を示し、第２図１１その
ときの溶融金属の流れを説明するための図であり、第３
図は電磁撹拌装置を使用して水平方向の流動成分をもつ
吐出流を形成している状態を示す。他方、第４図は、本
発明者等が先に提案した複層鋳片の製造方法を説明する
ための図である。
１．２：浸漬ノズル ３，４：溶融金属５．６：凝
固シェル ７：電磁石
８：吐出口 ９：吐出流
１０：電磁撹拌装置 Ｍ：鋳型
特許出願人 新日本製鐵 株式會社（ほか１名）
代 理 人 小 堀 益 （ほか
２名）第１図
第２図
第３図
第４図Figure 1 shows the state in which a multilayer slab is manufactured using a submerged nozzle with a discharge port opened on the side, and Figure 2 (11) is a diagram for explaining the flow of molten metal at that time. , 3rd
The figure shows a state in which an electromagnetic stirring device is used to form a discharge flow with a horizontal flow component. On the other hand, FIG. 4 is a diagram for explaining a method for manufacturing a multilayer slab previously proposed by the present inventors. 1.2: Immersion nozzle 3, 4: Molten metal 5.6: Solidified shell 7: Electromagnet 8: Discharge port 9: Discharge flow 10: Electromagnetic stirring device M: Mold patent applicant Nippon Steel Corporation (and 1 other person) ) Agent Masu Kobori (and 2 others) Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
の位置で、鋳片全幅にわたって磁力線が延在する静磁場
を印加し、この静磁場帯を境として上下に異なる金属を
供給することにより複層鋳片を連続鋳造する際に、前記
静磁場帯の下方に供給される溶融金属に対して水平方向
の流動成分を与えることを特徴とする複層鋳片の連続鋳
造方法。1. Applying a static magnetic field with lines of magnetic force extending across the entire width of the slab at a position below the level of the molten metal supplied to the mold, and supplying different metals above and below this static magnetic field zone. A continuous casting method for a multi-layer slab, characterized in that when continuously casting a multi-layer slab, a horizontal flow component is imparted to the molten metal supplied below the static magnetic field zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10055088A JPH01271042A (en) | 1988-04-22 | 1988-04-22 | Method for continuously casting double-layer cast slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10055088A JPH01271042A (en) | 1988-04-22 | 1988-04-22 | Method for continuously casting double-layer cast slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01271042A true JPH01271042A (en) | 1989-10-30 |
| JPH0464780B2 JPH0464780B2 (en) | 1992-10-16 |
Family
ID=14277052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10055088A Granted JPH01271042A (en) | 1988-04-22 | 1988-04-22 | Method for continuously casting double-layer cast slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01271042A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991012909A1 (en) * | 1990-02-23 | 1991-09-05 | Nippon Steel Corporation | Continuous casting apparatus |
| CN108348989A (en) * | 2015-10-30 | 2018-07-31 | 新日铁住金株式会社 | The continuous casting apparatus and continuous casing of complex ingot blank |
-
1988
- 1988-04-22 JP JP10055088A patent/JPH01271042A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991012909A1 (en) * | 1990-02-23 | 1991-09-05 | Nippon Steel Corporation | Continuous casting apparatus |
| CN108348989A (en) * | 2015-10-30 | 2018-07-31 | 新日铁住金株式会社 | The continuous casting apparatus and continuous casing of complex ingot blank |
| US10987730B2 (en) | 2015-10-30 | 2021-04-27 | Nippon Steel Corporation | Continuous casting apparatus and continuous casting method for multilayered slab |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0464780B2 (en) | 1992-10-16 |
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