JPH03193243A - Method for continuously casting extremely low carbon steel - Google Patents
Method for continuously casting extremely low carbon steelInfo
- Publication number
- JPH03193243A JPH03193243A JP33268689A JP33268689A JPH03193243A JP H03193243 A JPH03193243 A JP H03193243A JP 33268689 A JP33268689 A JP 33268689A JP 33268689 A JP33268689 A JP 33268689A JP H03193243 A JPH03193243 A JP H03193243A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- carbon
- powder
- molten steel
- low carbon
- 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
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 16
- 238000005266 casting Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052799 carbon Inorganic materials 0.000 abstract description 14
- 238000007654 immersion Methods 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000002265 prevention Effects 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000601 superalloy Inorganic materials 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〉
本発明は極低炭素鋼の連続鋳造方法に係り、詳しくはモ
ールド内溶鋼の表面を被覆するモールドパウダからカー
ボンピックアップを解消することができる極低炭素鋼の
連続鋳造方法に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a continuous casting method for ultra-low carbon steel, and more specifically, to a continuous casting method for ultra-low carbon steel, and more specifically, to a continuous casting method for ultra-low carbon steel. This invention relates to a continuous casting method for low carbon steel.
〈従来の技術〉
鋼の連続鋳造を行う際には、モールド内溶鋼面の酸化と
放熱を防ぐため溶鋼の表面をモールドパウダで被覆して
いる。しかしながらモールドパウダには、溶鋼の表面を
被覆するという役割の他に、鋳片表面とモールド内壁面
との潤滑を行うというもう一つの重要な役割があるため
、これら二つの役割を達成するように物性が決定される
。<Prior Art> When continuously casting steel, the surface of the molten steel in the mold is coated with mold powder to prevent oxidation and heat radiation of the molten steel surface. However, in addition to coating the surface of molten steel, mold powder has another important role of lubricating the surface of the slab and the inner wall of the mold. Physical properties are determined.
モールドパウダの潤滑は、具体的には５ｔＯｔ−ＣａＯ
系の物質により行なわれるが、潤滑性を得るためのスラ
グ化時間が早過ぎると、スラグ化によりモールドパウダ
の表面が赤熱状態になり、大気熱放散が大きくなる。そ
の結果、モールド内の溶鋼に不沈塊が発生し鋳片の品質
に重大な悪影響を及ぼすことになるので、これを防止す
るため、モールドパウダのスラグ化時間を抑制すると共
に保温性を向上する目的で５ｉＯ１−ＣａＯ系物質にカ
ーボンを添加している（例えば特公昭５５−１８７２号
公報、特公昭５７−２６１８３号、特公昭６３−５６０
１９号、特開昭６４−７５１５７号公報参照）。Specifically, the lubrication of the mold powder is 5tOt-CaO.
If the slagging time for obtaining lubricity is too early, the surface of the mold powder becomes red hot due to slagging, and heat dissipation into the atmosphere increases. As a result, unsinkable lumps are generated in the molten steel in the mold, which has a serious negative effect on the quality of the slab.To prevent this, it is necessary to suppress the time required for mold powder to become slag and improve heat retention. Carbon is added to 5iO1-CaO-based substances for the purpose of
No. 19, JP-A No. 64-75157).
記のようなカーボンを添加したモールドフラックスを使
用すると、モールドフラックス中のカーボンがモールド
内の溶鋼中に侵入し、得られた鋼板の絞り性の低下等を
来たすという問題点があった。When a mold flux containing carbon as described above is used, there is a problem in that the carbon in the mold flux invades the molten steel in the mold, resulting in a decrease in drawability of the obtained steel plate.
このような問題点を解決するために特開昭５７−５７８
２４号公報に開示されているように、加熱時に中空にな
る中空状パウダを使用して保温を図り、モールド内溶鋼
にピックアップされるカーボンを低減するものが知られ
ている。In order to solve these problems, Japanese Patent Application Laid-Open No. 57-578
As disclosed in Japanese Patent No. 24, a method is known in which a hollow powder that becomes hollow when heated is used to retain heat and reduce carbon picked up by molten steel in a mold.
〈発明が解決しようとする課題〉
しかしながら、前記中空状パウダを使用するだけではカ
ーボンを添加したモールドパウダはどの保温性が得られ
ないため、モールドパウダに補助的にカーボンを添加せ
ざるを得すカーボンピックアップを十分に抑制すること
は困難であった。<Problems to be Solved by the Invention> However, since the mold powder to which carbon is added cannot provide any heat retention properties simply by using the hollow powder, it is necessary to supplementally add carbon to the mold powder. It has been difficult to sufficiently suppress carbon pickup.
本発明は、前記の実状にかんがみてなされたものであっ
て、極低炭素鋼を連続鋳造するに際し、モールド内溶鋼
の表面被覆を十分に確保して溶鋼表面の酸化と放熱を防
止すると共に、モールドパウダの良好な潤滑性を維持し
、かつモールドパウダによる溶鋼のカーボンピックアッ
プを低減することができる極低炭素鋼を連続鋳造方法を
提供することを目的とするものである。The present invention has been made in view of the above-mentioned circumstances, and when continuously casting ultra-low carbon steel, it ensures sufficient surface coverage of the molten steel in the mold to prevent oxidation and heat radiation on the surface of the molten steel. It is an object of the present invention to provide a continuous casting method for ultra-low carbon steel that can maintain good lubricity of mold powder and reduce carbon pickup of molten steel by mold powder.
く課題を解決するための手段〉
本発明は、前記目的を達成すべく、モールドパウダの二
つの大きな機能、すなわちモールド内溶鋼の表面被覆に
よる酸化防止および放熱防止機能と、モールド内壁面と
鋳片との潤滑機能とを分離し、モールドパウダには潤滑
性だけの機能を主として持たせ、溶鋼の表面被覆機能は
溶鋼上に浮上する防熱板に分担させることに着目してな
されたものであり、その要旨とするところは下記の通り
である。Means for Solving the Problems> In order to achieve the above object, the present invention has two major functions of mold powder, namely, oxidation prevention and heat radiation prevention functions by coating the surface of molten steel in the mold, and prevention of oxidation and heat radiation by coating the surface of molten steel in the mold, and prevention of heat radiation by coating the surface of molten steel in the mold. This was done by focusing on separating the lubrication function from the molten steel, making the mold powder primarily have a lubrication function, and assigning the surface coating function of the molten steel to the heat shield that floats on top of the molten steel. The main points are as follows.
本発明は、極低炭素鋼を連続鋳造するに際し、モールド
内溶鋼の表面に防熱板を、該防熱板の側端が前記モール
ド内壁面に接触しないように所定の間隙を持たせて浮上
せしめ、前記防熱板の側端とモールド内壁面とのなす間
隙にカーボンフリーのモールドパウダを供給しつつ鋳造
することを特徴とする極低炭素鋼を連続鋳造方法である
。When continuously casting ultra-low carbon steel, the present invention floats a heat insulating plate on the surface of molten steel in a mold with a predetermined gap so that the side ends of the heat insulating plate do not contact the inner wall surface of the mold, This is a continuous casting method for ultra-low carbon steel, characterized in that casting is carried out while supplying carbon-free mold powder to the gap formed between the side edge of the heat shield plate and the inner wall surface of the mold.
以下、本発明の構成を図面に基いて説明する。Hereinafter, the configuration of the present invention will be explained based on the drawings.
第５図に示すように本発明で使用する防熱板１は、モー
ルドの内面形状に適応する長方体形状であり、その材質
としては耐熱性に優れているＡ ｌ １０２が適し、保
温効果を高めるためポーラスなＡ １．１０！質耐火物
を使用するのが好ましい。As shown in FIG. 5, the heat shield plate 1 used in the present invention has a rectangular shape that adapts to the inner surface shape of the mold, and its material is Al 102, which has excellent heat resistance and has a heat retaining effect. Porous A 1.10 to increase! Preferably, high quality refractories are used.
このような防熱板１の上面には、Ｌ字型の治具２が側端
から側方に突き出すように複数個取付けてあり、第２図
に示すようにＬ字型の治具２によって防熱板１の側端と
モールド５の内壁面とが所定の間隙Ｘが保持できるよう
になっていて、当該間隙Ｘにカーボンフリーのモールド
パウダ６を供給し、溶鋼７の熱によって速やかに溶融さ
せる。A plurality of L-shaped jigs 2 are attached to the upper surface of such a heat shield plate 1 so as to protrude laterally from the side edges, and as shown in FIG. A predetermined gap X can be maintained between the side edge of the plate 1 and the inner wall surface of the mold 5, and carbon-free mold powder 6 is supplied to the gap X and rapidly melted by the heat of the molten steel 7.
この部分で溶融したモールドパウダ６は鋳片の凝固シェ
ル８とモールド５の内壁面との間に流入し潤滑層を形成
することになる。６′はモールドパウダの熔融層を示す
。The molding powder 6 melted in this portion flows between the solidified shell 8 of the slab and the inner wall surface of the mold 5 to form a lubricating layer. 6' indicates a molten layer of mold powder.
この間隙Ｘはあまり多くとるとカーボンフリーのモール
ドパウダ６を使用するためスラグ化が速く、放熱が大き
くなるため４０ｔｘｍ以内にすることが好ましい、しか
し間隙Ｘが小さ過ぎると凝固シェル８が防熱板１の側端
に接着する危険があるので５Ｍ以上とするのが適当であ
る。If this gap Since there is a risk of adhesion to the side edges of the wire, it is appropriate to set it to 5M or more.
なお、防熱板１からモールド５の内壁面に延びるＬ字型
の治具２は耐熱性に優れた材質を使用し、例えばセラミ
ック材あるいは金属であればＮｉ超合金等を使用するこ
とができる。Note that the L-shaped jig 2 extending from the heat shield plate 1 to the inner wall surface of the mold 5 is made of a material with excellent heat resistance, such as a ceramic material or a metal such as Ni superalloy.
防熱板１が溶鋼７に接し高温に至った時点で表層が赤熱
して放熱が過大にならないようにするため第３図に示す
ように防熱板Ｉを包含する全面にカーボンフリーのモー
ルドパウダ６で被覆して放熱を低減するようにすること
ができる。In order to prevent the surface layer from becoming red hot and excessive heat dissipation when the heat shield plate 1 comes into contact with the molten steel 7 and reaches a high temperature, the entire surface including the heat shield plate I is coated with carbon-free molding powder 6, as shown in Fig. 3. It can be coated to reduce heat dissipation.
更には、第４図に示すように防熱板１の上面を山型にし
て、斜面にカーボンフリーのモールドパウダ６を供給し
て、使用中における防熱板１の温度上昇による放熱をモ
ールドパウダ自身で防止すると共に、防熱板１の表面で
溶融したモールドパウダ６を鋳型５の内壁面との間隙に
供給し、潤滑に利用することもできる。Furthermore, as shown in FIG. 4, the upper surface of the heat shield 1 is made into a mountain shape, and carbon-free molding powder 6 is supplied to the slope, so that the heat dissipation caused by the temperature rise of the heat shield 1 during use is absorbed by the mold powder itself. In addition to preventing this, the mold powder 6 melted on the surface of the heat shield plate 1 can be supplied to the gap between the inner wall surface of the mold 5 and used for lubrication.
また防熱板１が溶鋼７に接し高温に至った時点で表層が
赤熱して放熱が過大にならないようにするため、第６図
に示すように防熱板１の背面に凹部を設け、当該凹部に
黒鉛板３を嵌め込むか、あるいは第７図に示すように黒
鉛粉４を充填し防熱性を向上するのが好ましく、またそ
の上面をカーボンフリーのモールドパウダで全面被覆し
て放熱を防止するようにしてもよい。In addition, in order to prevent the surface layer from becoming red hot and excessive heat dissipation when the heat shield plate 1 comes into contact with the molten steel 7 and reaches a high temperature, a recess is provided on the back side of the heat shield plate 1 as shown in Fig. 6. It is preferable to fit a graphite plate 3 or fill it with graphite powder 4 as shown in Fig. 7 to improve heat insulation, and to prevent heat radiation by covering the entire upper surface with carbon-free molding powder. You may also do so.
く作用〉
本発明によれば、モールド５内の溶鋼表面の殆んどを被
覆して浮上する防熱板ｌが酸化防止および防熱機能を持
つことになる。このため、モールドパウダとして、潤滑
機能の優れたカーボンフリー（カーボン無添加）のモー
ルドパウダ６を使用することが可能になる。Effects> According to the present invention, the heat shield l that floats and covers most of the surface of the molten steel in the mold 5 has oxidation prevention and heat insulation functions. Therefore, it is possible to use a carbon-free (carbon-free) molding powder 6 with excellent lubrication function as the molding powder.
防熱板１の側端とモールド内壁面とが接触するとその部
分へのモールドパウダ６の供給が阻害され鋳片にブレー
クアウトを発生させる原因になる。When the side edge of the heat shield plate 1 comes into contact with the inner wall surface of the mold, the supply of mold powder 6 to that part is inhibited, causing breakout in the slab.
そこで両者が接触しないように所定の間隙Ｘを持たせで
あるので、当該間隙Ｘにカーボンフリーのモールドパウ
ダを確実に供給することができる。Therefore, since a predetermined gap X is provided so that the two do not come into contact with each other, carbon-free molding powder can be reliably supplied to the gap X.
その結果、良好な潤滑性のもとにカーボンピックアップ
を伴うことなく品質の良好な極低炭素鋼の連続鋳造を行
うことができる。As a result, it is possible to continuously cast ultra-low carbon steel of good quality without carbon pickup under good lubricity.
なお、防熱板１の側端とモールド内壁面が接触しないよ
うにするには、防熱板１に前記のように治具６を取付け
るなどしてモールド５の内壁面に近づけないように拘束
して位置決めすれば容易に所定の間隙を維持することが
できる。In order to prevent the side edges of the heat shield plate 1 from coming into contact with the inner wall surface of the mold, the jig 6 is attached to the heat shield plate 1 as described above to restrain them from coming close to the inner wall surface of the mold 5. Once positioned, a predetermined gap can be easily maintained.
〈実施例〉
第１図は本発明の一実施例を示す斜視図であり、第２図
は第１図のＡ−Ａ矢視を示す断面図である。<Embodiment> FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A in FIG.
第１図および第２図において、防熱板ｌは防熱効果を高
めるために＾２．０．質のポーラスれんがを選択し、第
６図に示す長方体形状の＾Ｑ ｔ’ｓ質ポーラスれんが
からなる防熱板ｌの背面に黒鉛３を嵌め込んだものを２
個使用した。各防熱板１の上面には側端から側方に突き
出すＬ字型の治具２がそれぞれ５個づつ取付けである。In Figures 1 and 2, the heat shield l has a thickness of ^2.0 to enhance the heat insulation effect. Select high-quality porous bricks, and insert graphite 3 into the back side of a rectangular-shaped heat shield plate l made of high-quality porous bricks as shown in Figure 6.
I used it. Five L-shaped jigs 2 are attached to the upper surface of each heat shield plate 1, each projecting laterally from the side edge.
極低炭素鋼を連続鋳造するに際し、長辺および短辺から
なるモールド５内の溶鋼７中に浸漬したイマージッンノ
ズル９の両側に位置させて溶鋼７上に防熱板１を治具２
によってモールド５の内壁面に接触しないように所定の
間隙ｘ −１０閣を持たせて位置決めすると共に、上下
に移動可能に浮上させた。なお、第１図では示していな
いが浸漬ノズル９側にも治具を設け、２個の防熱板１を
治具で連結するようにしてもよい。When continuously casting ultra-low carbon steel, heat shield plates 1 are placed on both sides of the immersion nozzle 9 immersed in the molten steel 7 in a mold 5 consisting of long and short sides, and a jig 2 is placed on the molten steel 7.
It was positioned with a predetermined gap of x-10 so as not to contact the inner wall surface of the mold 5, and was floated so as to be movable up and down. Although not shown in FIG. 1, a jig may also be provided on the immersion nozzle 9 side, and the two heat shield plates 1 may be connected using the jig.
そして、防熱＋７ｉ １０側端とモールド５の内壁面と
の間隙ｘ＝１０ｍの間に潤滑８！能のみを目的としたカ
ーボンフリーのモールドパウダ６を供給しつつ連続鋳造
を行った。Then, lubrication 8 between the heat insulation +7i 10 side edge and the gap x=10 m between the inner wall surface of the mold 5 Continuous casting was carried out while supplying carbon-free mold powder 6 intended only for performance.
本発明の実施例による効果を第８図に示す、第８図に示
すように本発明によれば従来のカーボン添加パウダおよ
び中空パウダを使用するものと比較して鋳込み当初から
カーボンピックアツプ量を大幅に低減することができた
。The effects of the embodiments of the present invention are shown in Fig. 8.As shown in Fig. 8, according to the present invention, the amount of carbon pick-up can be reduced from the beginning of casting compared to those using conventional carbon-added powder and hollow powder. We were able to significantly reduce this.
〈発明の効果〉
以上説明したように本発明の装置によれば溶鋼表面の殆
んどを被覆する防熱板により防熱を防止することができ
るので、カーボンフリーのモールドパウダを使用するこ
とが可能になる。このため溶鋼のカーボンピックアップ
を抑制することができ、品質の良い極低炭素鋼を安定し
て製造することができる。<Effects of the Invention> As explained above, according to the apparatus of the present invention, heat insulation can be prevented by the heat shield plate that covers most of the surface of the molten steel, making it possible to use carbon-free molding powder. Become. Therefore, carbon pickup in molten steel can be suppressed, and high-quality ultra-low carbon steel can be stably produced.
第１図は本発明の一実施例を示す斜視図、第２図は第１
図のＡ−Ａ矢視を示す断面図、第３図は本発明の他の一
実施例を示す断面図、第４図は更に他の一実施例を示す
断面図、第５図乃至第７図はそれぞれ本発明に係る防熱
板の異った構造例を示す斜視図、第８図は鋳片鋳込長さ
とカーボンピックアツプ量との関係を、本発明と従来例
とについて比較して示すグラフである。
ｌ・・・防熱板、 ２・・・治具、３・・・黒
鉛板、 ４・・・黒鉛粉、５・・・モールド、
６・・・モールドパウダ、７・・・溶鋼、
８・・・凝固シェル、９・・・イマージッンノズル
。FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
3 is a sectional view showing another embodiment of the present invention; FIG. 4 is a sectional view showing still another embodiment; FIGS. 5 to 7 The figures are perspective views showing different structural examples of heat shield plates according to the present invention, and Fig. 8 shows a comparison between the present invention and a conventional example of the relationship between the length of slab casting and the amount of carbon pick-up. It is a graph. l... Heat shield plate, 2... Jig, 3... Graphite plate, 4... Graphite powder, 5... Mold,
6...Mold powder, 7... Molten steel,
8... Solidified shell, 9... Imagin nozzle.
Claims (1)
面に防熱板を、該防熱板の側端が前記モールド内壁面に
接触しないように所定の間隙を持たせて浮上せしめ、前
記防熱板の側端とモールド内壁面とのなす間隙にカーボ
ンフリーのモールドパウダを供給しつつ鋳造することを
特徴とする極低炭素鋼の連続鋳造方法。When continuously casting ultra-low carbon steel, a heat insulating plate is floated on the surface of the molten steel in the mold with a predetermined gap so that the side edges of the heat insulating plate do not come into contact with the inner wall surface of the mold. A continuous casting method for ultra-low carbon steel characterized by casting while supplying carbon-free mold powder into the gap formed between the side edge and the inner wall surface of the mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33268689A JPH03193243A (en) | 1989-12-25 | 1989-12-25 | Method for continuously casting extremely low carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33268689A JPH03193243A (en) | 1989-12-25 | 1989-12-25 | Method for continuously casting extremely low carbon steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03193243A true JPH03193243A (en) | 1991-08-23 |
Family
ID=18257747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33268689A Pending JPH03193243A (en) | 1989-12-25 | 1989-12-25 | Method for continuously casting extremely low carbon steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03193243A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160068549A (en) * | 2014-12-05 | 2016-06-15 | 평화오일씰공업주식회사 | Differential side oil seal |
| KR20160068548A (en) * | 2014-12-05 | 2016-06-15 | 평화오일씰공업주식회사 | Differential side oil seal |
-
1989
- 1989-12-25 JP JP33268689A patent/JPH03193243A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160068549A (en) * | 2014-12-05 | 2016-06-15 | 평화오일씰공업주식회사 | Differential side oil seal |
| KR20160068548A (en) * | 2014-12-05 | 2016-06-15 | 평화오일씰공업주식회사 | Differential side oil seal |
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