JPH01271035A - Method for continuously casting steel - Google Patents
Method for continuously casting steelInfo
- Publication number
- JPH01271035A JPH01271035A JP9782588A JP9782588A JPH01271035A JP H01271035 A JPH01271035 A JP H01271035A JP 9782588 A JP9782588 A JP 9782588A JP 9782588 A JP9782588 A JP 9782588A JP H01271035 A JPH01271035 A JP H01271035A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- copper plate
- long side
- magnet
- cooling
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 6
- 238000005266 casting Methods 0.000 title claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 91
- 229910052802 copper Inorganic materials 0.000 claims abstract description 91
- 239000010949 copper Substances 0.000 claims abstract description 91
- 238000001816 cooling Methods 0.000 claims abstract description 47
- 239000000498 cooling water Substances 0.000 claims description 20
- 238000007654 immersion Methods 0.000 claims description 19
- 238000009749 continuous casting Methods 0.000 claims description 11
- 230000007547 defect Effects 0.000 abstract description 8
- 238000007599 discharging Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 10
- 230000004907 flux Effects 0.000 description 7
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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］
本発明はスラブの連続鋳造において、直流磁石を用いて
鋳型内の溶鋼の湯面波動を制御し、良好な鋳片を製造す
る鋼の連続鋳造用鋳型に間する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for continuously casting slabs, in which the surface waves of molten steel in the mold are controlled using DC magnets to produce good slabs. Place in casting mold.
［従来の技術］
第５図は従来のスラブの連続鋳造機の鋳型内の溶鋼及び
パウダーの状態を示す図である。この図を参照しながら
従来の技術を説明する。鋳型１内の溶鋼８の表面には溶
鋼の酸化防止と保温、凝固シェル９と鋳型１との間の潤
滑、非金属介在物の吸着等の役目をするモールドパウダ
ー５がある。[Prior Art] FIG. 5 is a diagram showing the state of molten steel and powder in a mold of a conventional continuous slab casting machine. The conventional technology will be explained with reference to this figure. On the surface of the molten steel 8 in the mold 1, there is mold powder 5, which functions to prevent oxidation and heat retention of the molten steel, lubricate between the solidified shell 9 and the mold 1, and adsorb nonmetallic inclusions.
このモールドパウダー５が溶１８と接する面は溶鋼の熱
で溶融パウダー６になっており、その反対の大気側は粉
状のパウダー７となって溶鋼の表面を覆っている。溶融
パウダー６は消耗するので一定のモールドパウダー厚さ
を維持するために、溶融パウダー６の消耗量に見合うだ
けの量が補給される。第５図に示すように鋳型１の中央
に鉛直に設けられた浸漬ノズル２の先端の吐出孔３は、
鋳型１の短辺方向に対向して開孔している。溶鋼はこの
吐出孔３から鋳型１内に吐出される。溶鋼の吐出流４は
鋳型１の短辺方向にハの字状になって溶湯内に拡散され
る。The surface of this mold powder 5 that comes into contact with the molten steel 18 becomes molten powder 6 due to the heat of the molten steel, and the opposite side to the atmosphere becomes powder 7 that covers the surface of the molten steel. Since the molten powder 6 is consumed, an amount corresponding to the consumed amount of the molten powder 6 is replenished in order to maintain a constant mold powder thickness. As shown in FIG. 5, the discharge hole 3 at the tip of the immersion nozzle 2 provided vertically in the center of the mold 1 is
The holes are opened opposite to each other in the short side direction of the mold 1. Molten steel is discharged into the mold 1 from the discharge hole 3. The discharge stream 4 of molten steel is diffused into the molten metal in a V-shape in the direction of the short side of the mold 1.
［発明が解決しようとする課題］
第６図は溶鋼の湯面波動を示す図である。しかしながら
この溶鋼の吐出流４は鋳型１に沿って形成した凝固シェ
ル９に衝突して上下の２つの流れ、反転流１１と侵入流
１２に分かれ、鋳型１面の凝固シェル９に沿って上昇す
る反転流１１は溶鋼８の湯面を盛り上げるとともに、湯
面波動１０を発生させる。特に溶鋼吐出量が３Ｔｂ上の
高速鋳造においては、吐出流速が大きくなるため鋳型１
表面に形成された凝固シェル９に、衝突後の溶鋼の上昇
流も大きくなり溶鋼表面の湯面波動１０が大きくなる。[Problems to be Solved by the Invention] FIG. 6 is a diagram showing surface waves of molten steel. However, this discharge flow 4 of molten steel collides with the solidified shell 9 formed along the mold 1 and is divided into two upper and lower flows, a reverse flow 11 and an intrusion flow 12, which ascend along the solidified shell 9 on the mold 1 surface. The reverse flow 11 raises the surface of the molten steel 8 and generates surface waves 10. Particularly in high-speed casting where the molten steel discharge amount is 3 Tb or more, the discharge flow rate becomes large, so the mold 1
The upward flow of the molten steel after colliding with the solidified shell 9 formed on the surface becomes large, and the surface waves 10 on the surface of the molten steel become large.
この溶鋼表面の湯面波動を調整する方法として直流磁石
をバックプレートの背面に配設して、溶鋼吐出流に直流
磁場を印加し、吐出流にブレーキをかけ吐出流の流速を
制御する方法がある。第７図はバックプレートの背面に
直流磁石を配設した従来の鋳型長辺銅板を示す図で、（
ａ）は正面図で、（ｂ）は冷却水の水箱側から見た側面
断面図で、（ｃ）は第７図（ａ）の線Ａ−Ａ’に沿った
平面断面図である。２１は鋳型長辺銅板、２２は冷却溝
、２３．２４は冷却箱で、詳しくは２３は上部の冷却箱
、２４は下部の冷却箱、２５はＯリング、２６はボルト
、２７は直流磁石、２８はバックプレートである。鋳型
長辺銅板２１裏面には冷却溝２２が縦方向に切削されて
いる。その面にバックプレート２８が配設されている。One way to adjust the surface waves of the molten steel is to place a DC magnet on the back of the back plate, apply a DC magnetic field to the molten steel discharge flow, apply a brake to the discharge flow, and control the flow velocity of the discharge flow. be. Figure 7 shows a conventional copper plate on the long side of a mold with a DC magnet placed on the back of the back plate.
7(a) is a front view, FIG. 7(b) is a side sectional view seen from the cooling water box side, and FIG. 7(c) is a plan sectional view taken along line AA' in FIG. 7(a). 21 is a copper plate on the long side of the mold, 22 is a cooling groove, 23 and 24 are cooling boxes, specifically 23 is an upper cooling box, 24 is a lower cooling box, 25 is an O-ring, 26 is a bolt, 27 is a DC magnet, 28 is a back plate. Cooling grooves 22 are cut in the longitudinal direction on the back surface of the long side copper plate 21 of the mold. A back plate 28 is arranged on that surface.
冷却溝２２とバックプレート２８の空隙に冷却水を通す
、バックプレート２８の上方と下方に冷却箱２３が配置
されており、鋳型長辺銅板２１を冷却する。冷却水は下
部の冷却箱２４に給水され、冷却溝２２、上部の冷却箱
２３を通って系外に排水される。鋳型長辺銅板２１と冷
却箱２３の接続は冷却箱２３．２４の裏面よりボルト２
６により鋳型長辺銅板２１に締着する。又、鋳型長辺銅
板２１と冷却箱２３．２４の冷却水が外部に漏れないよ
うに、鋳型長辺銅板２１と冷却箱２３．２４の間にＯリ
ング２５を配置する。Cooling boxes 23 are disposed above and below the back plate 28 to allow cooling water to pass through the gap between the cooling groove 22 and the back plate 28, and cool the long side copper plate 21 of the mold. Cooling water is supplied to the lower cooling box 24, passes through the cooling groove 22 and the upper cooling box 23, and is drained out of the system. The long side copper plate 21 of the mold and the cooling box 23 are connected by bolts 2 from the back of the cooling box 23 and 24.
6 to fasten it to the long side copper plate 21 of the mold. Further, an O-ring 25 is placed between the mold long side copper plate 21 and the cooling box 23.24 to prevent the cooling water from leaking to the outside.
そして溶鋼表面の湯面の波動をコントロールする方法と
して直流磁石２７を冷却箱２３と２４の中央部に配設し
、溶鋼吐出流に直流磁場を印加し、吐出流にブレーキを
かけて吐出流の流速を抑えているが、最近、連続鋳造機
の生産性を上げるために一層の高速鋳造（例えば３ Ｔ
ｏｎ／ｗｉｎ以上）を行うと、この方式では吐出流にブ
レーキをかけても吐出流の流速を完全に抑えることがで
きず、鋳型短辺銅板部付近の溶鋼表面の湯面波動が大き
くなり、良好な表面性状を有する鋳片を得られないとい
う問題があった。この発明は係る事情に鑑みてなされた
ものであって、浸漬ノズル部の吐出流にブレーキをかけ
る直流磁石と、鋳型短辺銅板部付近の溶鋼表面の湯面の
波動を制御する直流磁石を設置し、鋳型内の湯面変動を
抑制をすることによりパウダー巻き込みの減少を図り、
鋳片の表面欠陥を防止することを目的とする。As a method of controlling the wave motion of the molten steel surface, a DC magnet 27 is placed in the center of the cooling boxes 23 and 24, and a DC magnetic field is applied to the molten steel discharge flow to apply a brake to the discharge flow. However, recently, in order to increase the productivity of continuous casting machines, even higher speed casting (for example, 3 T
(on/win or higher), this method cannot completely suppress the flow velocity of the discharge flow even if the brake is applied to the discharge flow, and the surface waves of the molten steel near the copper plate on the short side of the mold become large. There was a problem in that it was not possible to obtain slabs with good surface properties. This invention was made in view of the above circumstances, and includes a DC magnet that brakes the discharge flow from the submerged nozzle and a DC magnet that controls the wave motion of the molten steel surface near the copper plate on the short side of the mold. By suppressing fluctuations in the molten metal level within the mold, we aim to reduce powder entrainment.
The purpose is to prevent surface defects in slabs.
［課題を解決するための手段］
この発明の鋼の連続鋳造用鋳型は、鋳型長辺銅板の裏面
を冷却するための銅板裏面に横方向に切削された冷却溝
と、前記冷却溝を覆うバックプレートと、前記バックプ
レートの両端に配設されて鋳型長０辺銅板の冷却溝に冷
却水を給排水する冷却箱とによって構成された連続鋳造
鋳造鋳型に、鋳型長辺銅板の裏面の上端から５０〜２５
０■の範囲に２対以上の直流磁石を配して磁場を印加し
ながら鋳造することを特徴とする。[Means for Solving the Problems] The mold for continuous casting of steel according to the present invention includes cooling grooves cut horizontally on the back surface of the copper plate for cooling the back surface of the long side copper plate of the mold, and a back cover covering the cooling grooves. A continuous casting casting mold consisting of a plate and a cooling box disposed at both ends of the back plate for supplying and draining cooling water to the cooling grooves of the copper plate on the long side of the mold is placed in a continuous casting mold with a diameter of 50 mm from the upper end of the back surface of the copper plate on the long side of the mold. ~25
It is characterized in that two or more pairs of DC magnets are arranged in a range of 0.0 mm and casting is performed while applying a magnetic field.
［作用］
この発明による鋼の連続鋳造用鋳型は鋳型長辺銅板の裏
面に横方向に切削され冷却溝が設置されているので、冷
却溝に冷却水を供給する冷却箱が鋳型長辺銅板の両端に
配置できる。そうすると浸漬ノズルの吐出孔位置に相当
する範囲（鋳型幅の中央部で鋳型長辺銅板の上端から１
５０〜２５０ｍｍ）と吐出流が短辺面の凝固シェルに衝
突して上昇する反転流を制御する位置（鋳型短辺銅板の
両端から１００ｍｍ位置で、かつ鋳型長辺銅板の上端か
ら５０〜１５０ｍｍの範囲）に直流磁石を配置すると浸
漬ノズルの吐出流にブレーキをかかり、鋳型長辺銅板部
付近の溶鋼表面の湯面の波動を制御することができる。[Function] The mold for continuous casting of steel according to the present invention has cooling grooves cut horizontally on the back surface of the copper plate on the long side of the mold, so that the cooling box that supplies cooling water to the cooling grooves is installed on the back side of the copper plate on the long side of the mold. Can be placed at both ends. Then, the area corresponding to the discharge hole position of the immersion nozzle (at the center of the mold width, 1 minute from the top of the copper plate on the long side of the mold)
50 to 250 mm) and a position where the discharge flow collides with the solidified shell on the short side to control the upward reverse flow (100 mm from both ends of the copper plate on the short side of the mold, and 50 to 150 mm from the top of the copper plate on the long side of the mold). If a DC magnet is placed in the area), it will brake the discharge flow from the immersion nozzle and control the wave motion of the molten steel surface near the copper plate on the long side of the mold.
［実施例］
以下本発明の実施例を図面を参照しながら具体的に説明
する。第１図は本発明の実施例の鋳型長３７１銅板を示
す図で、（ａ＞は鋳型長辺銅板の正面図、（ｂ）は第１
図（ａ）の線Ａ−Ａ’に沿った断面図である。第２図は
本発明の実施例の鋳型長辺銅板の裏面に配設された冷却
水箱を示す図で、（ａ）は冷却水箱等の正面図、（ｂ）
は第２図＜ａ）の線Ｂ−Ｂ’矢視の断面図である。３１
は鋳型長辺銅板、３２は冷却溝、３３は冷却箱のバック
プレート、３４．３５は冷却箱で、詳しくは３４は鋳型
長辺銅板冷却水の給水側の冷却箱、３５は鋳型長辺銅板
冷却水の排水側の冷却箱（設備の配置上３４．３５が逆
になることもある）、３６は直流磁石で、この冷却箱の
バックプレート３３の裏面側に配設した。[Examples] Examples of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing a copper plate with a mold length of 371 according to an embodiment of the present invention, (a> is a front view of the copper plate on the long side of the mold, and (b) is a view of the copper plate on the long side of the mold.
It is a sectional view along line AA' of figure (a). FIG. 2 is a diagram showing a cooling water box arranged on the back side of the copper plate on the long side of the mold according to an embodiment of the present invention, (a) is a front view of the cooling water box, etc., and (b)
is a sectional view taken along line BB' in FIG. 2<a). 31
32 is the mold long side copper plate, 32 is the cooling groove, 33 is the back plate of the cooling box, 34, 35 is the cooling box, in detail, 34 is the mold long side copper plate cooling box on the cooling water supply side, 35 is the mold long side copper plate A cooling box on the cooling water drainage side (34 and 35 may be reversed due to the arrangement of the equipment), 36 is a DC magnet, and is arranged on the back side of the back plate 33 of this cooling box.
ここでは鋳型長辺銅板３１の片側の例で説明したが、こ
れと同様なものは溶鋼を挟んで反対側にも相対向して配
置されている。Although the explanation has been given here with an example of one side of the long-side copper plate 31 of the mold, a similar one is also arranged facing each other on the opposite side with the molten steel in between.
（実施例１）
第３図はこの発明の一実施例の鋳型長辺銅板のバックプ
レートに直流磁石を配設した図で（ａ）は平面図で、（
ｂ）は正面図である。３１は鋳型長辺銅板（３１ａは前
面鋳型長辺銅板、３１ｂは後面鋳型長辺銅板）、３２は
冷却溝、３３は冷却箱のバックプレート、３４．３５は
冷却箱で、詳しくは、３４は鋳型長辺銅板冷却水の給水
側の冷却箱、３５は鋳型長辺銅板冷却水の排水側の冷却
箱（設備の配置上３４．３５が逆になることもある＞、
３６．３７は直流磁石（３６は第１直流磁石、３７は第
２直流磁石）、３８は鋳型短辺銅板、３９は鋳型短辺銅
板の冷却水の冷却箱、４０は０リングで、４１はボルト
である。鋳型長辺銅板３１の幅中央で、浸漬ノズルの吐
出孔部に設置した直流磁石を第１直流磁石３６といい、
磁極の断面形状は１０１００Ｘ２００のものを用いた。(Example 1) Fig. 3 is a diagram showing a DC magnet arranged on the back plate of a long side copper plate of a mold according to an embodiment of the present invention, and (a) is a plan view;
b) is a front view. 31 is the long side copper plate of the mold (31a is the long side copper plate of the front mold, 31b is the long side copper plate of the rear mold), 32 is the cooling groove, 33 is the back plate of the cooling box, 34.35 is the cooling box. 35 is a cooling box on the water supply side of the copper plate cooling water on the long side of the mold, and 35 is a cooling box on the drainage side of the copper plate cooling water on the long side of the mold (34 and 35 may be reversed due to equipment layout).
36.37 is a DC magnet (36 is a first DC magnet, 37 is a second DC magnet), 38 is a copper plate on the short side of the mold, 39 is a cooling box for the cooling water of the copper plate on the short side of the mold, 40 is an O ring, and 41 is a It's a bolt. The DC magnet installed in the discharge hole of the immersion nozzle at the center of the width of the copper plate 31 on the long side of the mold is referred to as a first DC magnet 36.
The magnetic pole used had a cross-sectional shape of 10100×200.
第１直流磁石３６ａの一方の磁極４５ａは鋳型長辺銅板
３１の上端から１５０〜２５０ｍｍの位置に相当する場
所、第１直流磁石３６ａの他方の磁極４５ｂは鋳型長辺
銅板３１の上端から７５０〜８５０ ｍｍの位置に相当
する場所に設置した。第１直流磁石３６ａの一方の磁極
４５ａが設置された鋳型長辺銅板３１の上端から１５０
〜２５０１ｍ５の範囲は、浸漬ノズルの吐出孔があるあ
る場所で、この磁石で吐出流を制御することができる。One magnetic pole 45a of the first DC magnet 36a is located at a position corresponding to 150 to 250 mm from the upper end of the mold long side copper plate 31, and the other magnetic pole 45b of the first DC magnet 36a is located 750 to 750 mm from the upper end of the mold long side copper plate 31. It was installed at a location corresponding to a position of 850 mm. 150 meters from the upper end of the mold long side copper plate 31 on which one magnetic pole 45a of the first DC magnet 36a is installed.
The range of ~2501 m5 is a certain place where the discharge hole of the immersion nozzle is located, and the discharge flow can be controlled with this magnet.
第１直流磁石３６ａの他方の磁極４５ｂは鋳型長辺銅板
３１の上端から７５０〜８５０Ｉｌ１ｍの位置は、鋳型
長辺銅板の下端から飛び出でない範囲であり、この範囲
に設置した０通常の鋳型長辺銅板の高さは９００ｍｍで
あるため、他方の磁極４５ｂを７５０〜８５０１ＩＩＩ
１１の範囲は磁極が鋳型下端から飛出ない位置である。The other magnetic pole 45b of the first DC magnet 36a is located at a position of 750 to 850 Il1m from the upper end of the mold long side copper plate 31, in a range where it does not protrude from the lower end of the mold long side copper plate, and the long side of the normal mold installed in this range is Since the height of the copper plate is 900mm, the height of the other magnetic pole 45b is 750~8501III.
The range 11 is a position where the magnetic pole does not protrude from the lower end of the mold.
前面鋳型長辺銅板３１ａの第１直流磁石を３６ａ、後面
鋳型長辺銅板３１ｂの第１直流磁石を３６ｂとした。磁
束の方向が鋳型の厚み方向に貫通するように前面鋳型長
辺銅板３１ａの第１直流磁石３６ａと後面鋳型長辺銅板
３１ｂの第１直流磁石３６ｂに、磁極として、Ｎ極とＳ
極（磁極４５ａ、４６ａ、４５ｂ、４６ｂ相当する）を
設定した。即ち、前面鋳型長辺銅板３１ａの第１直流磁
石３６ａの上側の磁極４５ａをＮ極、下側の磁極４５．
ｂをＳ極とすれば、後面鋳型長辺銅板３１ｂの第１直流
磁石３６ｂの上側の磁極４６ａをＳ極、下側の磁極４６
ｂをＮ極とした。またこの逆であってもさしつかえない
、一方、鋳型短辺銅板３８付近で、鋳型長辺銅板３１の
背面に磁極が配置された直流磁石を第２直流磁石３７ａ
といい、鋳型短辺銅板３８と前面鋳型長辺銅板３１ａと
後面鋳型長辺銅板３１ｂを挟み込むように配置した。そ
の設置位置は鋳型短辺銅板３８から１００１１ｍ離れた
鋳型長辺銅板３１の浸漬ノズル側よりの範囲で、鋳型長
辺銅板３１の上端から５０〜１５０ｍｍの範囲とした。The first DC magnet of the long side copper plate 31a of the front mold was 36a, and the first DC magnet of the long side copper plate 31b of the rear mold was 36b. The first DC magnet 36a of the front mold long side copper plate 31a and the first DC magnet 36b of the rear mold long side copper plate 31b are provided with N and S poles as magnetic poles so that the direction of magnetic flux penetrates in the thickness direction of the mold.
Poles (corresponding to magnetic poles 45a, 46a, 45b, and 46b) were set. That is, the upper magnetic pole 45a of the first DC magnet 36a of the long side copper plate 31a of the front mold is the N pole, and the lower magnetic pole 45.
If b is the S pole, the upper magnetic pole 46a of the first DC magnet 36b of the rear mold long side copper plate 31b is the S pole, and the lower magnetic pole 46 is the S pole.
b was set as the north pole. On the other hand, in the vicinity of the copper plate 38 on the short side of the mold, the DC magnet whose magnetic pole is arranged on the back side of the copper plate 31 on the long side of the mold is connected to the second DC magnet 37a.
The mold short side copper plate 38, the front mold long side copper plate 31a, and the rear mold long side copper plate 31b are arranged so as to be sandwiched therebetween. The installation position was in the range from the immersion nozzle side of the mold long side copper plate 31 which was 10011 m away from the mold short side copper plate 38, and in the range of 50 to 150 mm from the upper end of the mold long side copper plate 31.
この第２直流磁石３７ａには、磁極４７ａ、４７ｂが配
置されている。この第２直流磁石３７ａには鋳型短辺銅
板３８と連動して動くようにしである。即ち、スラブ幅
が変化しても常に鋳型短辺銅板３８からの相対位置が変
わらないようにした。なお鋳型短辺銅板３８は相対向す
る位置にもあり、かつ第２直流磁石３７ｂがあり、その
磁極は４８ａ、４８ｂとなる。この配置も第２直流磁石
３７ａと同じである０本発明の連続鋳造用鋳型を使って
鋳造したスラブを圧延し、製品の表面疵の発生状況を調
べた結果を第１表に示す、この時の鋳造条件はスラブ幅
は１０００ｍｍ、スラブ厚みは２２０ｍｍ、引き抜き速
度２．５ｍ／ｍｉａ、浸漬ノズルの内径は８０ｍｍΦ、
浸漬ノズルの吐出孔径は７５ｍｍΦ、浸漬ノズル内側の
底部の形状は逆Ｙ型であり、浸漬ノズルの吐出孔の角度
は水平に対して２５度下向きのものを用いた。各々の直
流磁石の磁束密度は０２１０００．２０００ガウスの場
合について比較した。第１表に示すように磁束密度を上
げることにより製品の表面疵の発生率は減少している。Magnetic poles 47a and 47b are arranged on this second DC magnet 37a. This second DC magnet 37a is designed to move in conjunction with the copper plate 38 on the short side of the mold. That is, even if the slab width changes, the relative position from the short side copper plate 38 of the mold always remains unchanged. The short side copper plates 38 of the mold are also located at opposing positions, and there is also a second DC magnet 37b, the magnetic poles of which are 48a and 48b. This arrangement is also the same as the second DC magnet 37a. Table 1 shows the results of rolling a slab cast using the continuous casting mold of the present invention and investigating the occurrence of surface defects on the product. The casting conditions are: slab width 1000mm, slab thickness 220mm, drawing speed 2.5m/mia, inner diameter of immersion nozzle 80mmΦ,
The diameter of the discharge hole of the immersion nozzle was 75 mmΦ, the shape of the bottom inside the immersion nozzle was an inverted Y shape, and the angle of the discharge hole of the immersion nozzle was 25 degrees downward with respect to the horizontal. The magnetic flux density of each DC magnet was compared in the case of 021000.2000 Gauss. As shown in Table 1, the incidence of surface defects on products is reduced by increasing the magnetic flux density.
第１表
※は磁束密度は各々の直流磁石とも同じ※※は表面疵の
発生率＝
（表面疵の発生コイル／観察コイル）Ｘ１００（実施例
２）
第４図は本発明の他の実施例の図であり、鋳型長辺銅板
の冷却水箱のバックプレートに直流磁石を配設した図で
ある。第４図において、（ａ）は平面図、（ｂ）は側面
図である。鋳型長辺銅板と冷却水箱等は実施例１と同一
のものを用いて、第１直流磁石は実施例１と同一の配置
であるが、第２直流磁石３７は実施例１の配置と異なり
前面鋳型長辺銅板３１ａ、後面鋳型長辺銅板３１ｂ対象
に配置した。第２直流磁石は、上端の磁極５１ａ、５２
ａは、鋳型短辺銅板３８から１００■ｍ離れた鋳型長辺
銅板３１の浸漬ノズル側よりで、鋳型長辺銅板３１の上
端から５０〜１５０ｍｍの範囲で、一方の磁極５１．５
２ｂは、鋳型短辺銅板３８から１００ｍｍ離れた鋳型長
辺銅板３１の浸漬ノズル側より、鋳型長辺銅板３１の上
端から６５０〜７５０ｍｍの範囲である。第２直流磁石
の上端の磁極５１ａ、５２ｂは、凝固シェルに沿って上
昇する反転流を制御し、湯面波動を一定にし、第２直流
磁石の下端の磁極５１ｂ、５２ｂは、凝固シェルに沿っ
て下降する侵入流を制御し、非金属介在物の鋳片への巻
き込みを防止する。前面鋳型長辺銅板３１ａの浸漬ノズ
ルを中心に対称の位置に、第２直流磁石３７ｂが配置さ
れている。ここでの直流磁石の上端の磁極５３ａ。Table 1 * shows that the magnetic flux density is the same for each DC magnet * * indicates the incidence of surface flaws = (surface flaw generation coil/observation coil) x 100 (Example 2) Figure 4 shows another example of the present invention This is a diagram in which a DC magnet is arranged on the back plate of the cooling water box of the copper plate on the long side of the mold. In FIG. 4, (a) is a plan view, and (b) is a side view. The copper plate on the long side of the mold, the cooling water box, etc. are the same as in Example 1, and the first DC magnet is arranged in the same manner as in Example 1, but unlike the arrangement in Example 1, the second DC magnet 37 is placed on the front side. The mold long side copper plate 31a and the rear mold long side copper plate 31b were arranged symmetrically. The second DC magnet has magnetic poles 51a and 52 at the upper end.
a is from the immersion nozzle side of the mold long side copper plate 31 which is 100 μm away from the mold short side copper plate 38, and in the range of 50 to 150 mm from the upper end of the mold long side copper plate 31, one magnetic pole 51.5
2b is a range of 650 to 750 mm from the upper end of the mold long side copper plate 31 from the immersion nozzle side of the mold long side copper plate 31 that is 100 mm away from the mold short side copper plate 38. The magnetic poles 51a and 52b at the upper end of the second DC magnet control the reverse flow that rises along the solidified shell and keep the surface wave motion constant, and the magnetic poles 51b and 52b at the lower end of the second DC magnet control the reverse flow that rises along the solidified shell. This prevents non-metallic inclusions from being drawn into the slab by controlling the descending intrusion flow. A second DC magnet 37b is arranged symmetrically with respect to the immersion nozzle of the front mold long side copper plate 31a. The magnetic pole 53a at the upper end of the DC magnet here.
５４ａは、凝固シェルに沿って上昇する反転流及び湯面
波動を同時に制御し、第２直流磁石の下端の磁極５３ｂ
、５４ｂは、凝固シェルに沿って下降する侵入流を制御
し、非金属介在物の鋳片への巻き込みを防止する。ここ
では前面鋳型長辺銅板３１ａ側について説明したが、こ
れと同様なものが後面鋳型長辺銅板３１ｂ側にも配置さ
れている。即ち、第１直流磁石３６ｂ、第２直流磁石３
７ａ’、第２直流磁石３７ｂ′である。この第２直流磁
石３７には鋳型短辺銅板３８と連動して動くようにしで
ある。即ち、スラブ幅が変化しても常に鋳型短辺銅板３
８からの相対位置が変わらないようにした。54a simultaneously controls the reversal flow rising along the solidified shell and the surface wave motion, and the magnetic pole 53b at the lower end of the second DC magnet.
, 54b controls the intrusion flow descending along the solidified shell and prevents non-metallic inclusions from being entrained in the slab. Although the description has been made on the long side copper plate 31a side of the front mold, something similar to this is also arranged on the long side copper plate 31b side of the rear mold. That is, the first DC magnet 36b, the second DC magnet 3
7a' and a second DC magnet 37b'. This second DC magnet 37 is designed to move in conjunction with the copper plate 38 on the short side of the mold. In other words, even if the slab width changes, the mold short side copper plate 3 is always
The relative position from 8 did not change.
本発明の連続鋳造用鋳型を使って鋳造したスラブを圧延
し、製品の表面疵の発生状況を調べた結果を第２表に示
す、この時の鋳造条件はスラブ幅１２００ｍｍ、スラブ
厚み２２０ｕ、引き抜き速度２．２ｍ／ｍｉｓ、浸漬ノ
ズルの内径８０ＩｌｆｆｌΦ、浸漬ノズルの吐出孔径７
５ｍｍΦ、浸漬ノズル内側の底部の形状は逆Ｙ型であり
、浸漬ノズルの吐出孔の角度は水平に対して２５度下向
きのものを用いた。各々の直流磁石の磁束密度はＯｌｌ
０００゜２０００ガウスの場合について比較した。第
２表に示すように磁束密度を上げることにより製品の表
面疵の発生率は減少している。Table 2 shows the results of rolling a slab cast using the continuous casting mold of the present invention and investigating the occurrence of surface defects on the product.The casting conditions were: slab width 1200mm, slab thickness 220u, drawing Speed 2.2m/mis, inner diameter of immersion nozzle 80IlfflΦ, discharge hole diameter of immersion nozzle 7
The diameter of the immersion nozzle was 5 mm, the shape of the bottom inside the immersion nozzle was an inverted Y shape, and the angle of the discharge hole of the immersion nozzle was 25 degrees downward with respect to the horizontal. The magnetic flux density of each DC magnet is Oll
A comparison was made for the case of 000°2000 Gauss. As shown in Table 2, the incidence of surface defects on products is reduced by increasing the magnetic flux density.
第２表
※は磁束密度は各々の直流磁石とも同じ※※は表面疵の
発生率＝
（表面疵の発生コイル／観察コイル）Ｘ１００［発明の
効果］
この発明は冷却箱が鋳型長辺銅板の両端に配置されてい
るので、直流磁石を鋳型長辺銅板の任意の位置に設置で
きる。そのため鋳型内の溶鋼の流動を自由に制御するこ
とができ、溶鋼表面の波動を減衰させることができる。Table 2 * shows that the magnetic flux density is the same for each DC magnet * * indicates the rate of occurrence of surface flaws = (surface flaw generation coil/observation coil) Since they are placed at both ends, the DC magnet can be placed at any position on the copper plate on the longer side of the mold. Therefore, the flow of molten steel within the mold can be freely controlled, and wave motion on the surface of the molten steel can be attenuated.
その結果、製品の表面疵の発生率が減少する。As a result, the incidence of surface defects on the product is reduced.
第１図は本発明の実施例の鋳型長辺銅板を示す図、第２
図は本発明の実施例の鋳型長辺銅板の裏面に配設された
冷却水箱を示す図、第３図はこの発明の一実施例の鋳型
長辺銅板の冷却水箱のバックプレートに直流磁石を配設
した図、第４図は・本発明の他の実施例の鋳型長辺銅板
の冷却水箱のバックプレートに直流磁石を配設した図、
第５図は従来の一スラブの連続鋳造機の鋳型内の溶鋼及
びパウダーの状態を示す図、第６図は溶鋼の湯面波動を
示す図、第７図はバックプレートの背面に直流磁石を配
設した従来の鋳型長辺銅板を示す図である。。
３１・・・鋳型長辺銅板、３２は冷却溝、３３・・・冷
却箱のバックプレート、
３４．３５・・・冷却箱、３６．３７・・・直流磁石、
３８・・・鋳型短辺銅板、
３９・・・鋳型短辺銅板の冷却水の冷却箱、４０・・・
０リング、４１・・・ボルト。Figure 1 is a diagram showing the copper plate on the long side of the mold according to the embodiment of the present invention;
The figure shows a cooling water box arranged on the back side of the copper plate on the long side of the mold according to an embodiment of the present invention, and Fig. 3 shows a DC magnet installed on the back plate of the cooling water box on the copper plate on the long side of the mold according to an embodiment of the present invention. FIG. 4 is a diagram showing the arrangement of DC magnets on the back plate of the cooling water box of the long side copper plate of the mold according to another embodiment of the present invention.
Figure 5 is a diagram showing the state of molten steel and powder in the mold of a conventional single-slab continuous casting machine, Figure 6 is a diagram showing molten steel surface waves, and Figure 7 is a diagram showing a DC magnet on the back of the back plate. It is a figure which shows the conventional mold long side copper plate arrange|positioned. . 31...Mold long side copper plate, 32... Cooling groove, 33... Cooling box back plate, 34.35... Cooling box, 36.37... DC magnet,
38...Mold short side copper plate, 39...Mold short side copper plate cooling water cooling box, 40...
0 ring, 41... bolt.
Claims (1)
鋳造する連続鋳造用鋳型において、鋳型長辺銅板の裏面
を冷却するための銅板裏面に横方向に切削された冷却溝
と、前記冷却溝を覆うバックプレートと、前記バックプ
レートの両端に配設されて鋳型長辺銅板の冷却溝に冷却
水を給排水する冷却箱とによって構成された連続鋳造用
鋳型に、鋳型長辺銅板の裏面の上端から５０〜２５０ｍ
ｍの範囲に２対以上の直流磁石を配して磁場を印加しな
がら鋳造することを特徴とする鋼の連続鋳造方法。In a continuous casting mold in which molten steel is cast into the mold from a tundish via an immersion nozzle, cooling grooves cut horizontally on the back surface of the copper plate for cooling the back surface of the long side copper plate of the mold, and covering the cooling grooves. A continuous casting mold consisting of a back plate and a cooling box disposed at both ends of the back plate for supplying and draining cooling water to the cooling grooves of the copper plate on the long side of the mold is placed 50 mm from the upper end of the back surface of the copper plate on the long side of the mold. ~250m
A continuous casting method for steel, characterized in that two or more pairs of DC magnets are arranged in a range of m and casting is performed while applying a magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9782588A JPH01271035A (en) | 1988-04-20 | 1988-04-20 | Method for continuously casting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9782588A JPH01271035A (en) | 1988-04-20 | 1988-04-20 | Method for continuously casting steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01271035A true JPH01271035A (en) | 1989-10-30 |
Family
ID=14202504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9782588A Pending JPH01271035A (en) | 1988-04-20 | 1988-04-20 | Method for continuously casting steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01271035A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5212128A (en) * | 1991-11-29 | 1993-05-18 | Exxon Research & Engineering Company | Method for recovering or maintaining the activity of hydroisomerization catalysts |
| WO2001017713A1 (en) * | 1999-09-03 | 2001-03-15 | Abb Ab | A device for continuous or semi-continuous casting of metals |
| WO2003041893A1 (en) * | 2001-09-27 | 2003-05-22 | Abb Ab | A device and a method for continuous casting |
| CN104096810A (en) * | 2014-06-30 | 2014-10-15 | 武汉泛洲中越合金有限公司 | Horizontal continuous casting crystallizer |
-
1988
- 1988-04-20 JP JP9782588A patent/JPH01271035A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5212128A (en) * | 1991-11-29 | 1993-05-18 | Exxon Research & Engineering Company | Method for recovering or maintaining the activity of hydroisomerization catalysts |
| WO2001017713A1 (en) * | 1999-09-03 | 2001-03-15 | Abb Ab | A device for continuous or semi-continuous casting of metals |
| WO2003041893A1 (en) * | 2001-09-27 | 2003-05-22 | Abb Ab | A device and a method for continuous casting |
| US6938674B2 (en) | 2001-09-27 | 2005-09-06 | Abb Ab | Device and a method for continuous casting |
| US7305271B2 (en) | 2001-09-27 | 2007-12-04 | Abb Ab | Device and a method for continuous casting |
| CN104096810A (en) * | 2014-06-30 | 2014-10-15 | 武汉泛洲中越合金有限公司 | Horizontal continuous casting crystallizer |
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