JPH0584553A - Mold powder for continuously casting steel - Google Patents
Mold powder for continuously casting steelInfo
- Publication number
- JPH0584553A JPH0584553A JP24862491A JP24862491A JPH0584553A JP H0584553 A JPH0584553 A JP H0584553A JP 24862491 A JP24862491 A JP 24862491A JP 24862491 A JP24862491 A JP 24862491A JP H0584553 A JPH0584553 A JP H0584553A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- carbon
- teo
- steel
- molten
- 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
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば炭素含有量が 3
0ppm以下というような極低炭素鋼を連続鋳造する場合に
使用するのに好適なモールドパウダーに関する。BACKGROUND OF THE INVENTION The present invention has a carbon content of 3
The present invention relates to a mold powder suitable for use in continuous casting of ultra low carbon steel such as 0 ppm or less.
【０００２】[0002]
【従来の技術】鋼の連続鋳造において、モールド内の溶
鋼の酸化を防止し、湯面に浮上しまたは形成される酸化
物や硫化物等を溶解吸収し、モールドと鋳片との間の潤
滑性を良好に保つ等の目的でモールド内の湯面にモール
ドパウダー（以下、単にパウダーともいう）を添加す
る。従来の連続鋳造用モールドパウダーはCaO-SiO2-Al2
O3を基材とし、これにアルカリ金属酸化物をふっ化物や
炭酸塩として添加したり、CaF2を添加して、凝固点や粘
度を調整している。また、骨材として炭素（カーボン）
を添加することによりパウダーの溶融速度を調整してい
る。これは、パウダーを使用するにあたってその溶融速
度が大きな問題となるためで、もし、骨材としてのカー
ボンが存在しなければパウダーは急速に溶融し、湯面を
覆うことはできない。つまり、パウダーを製作するにあ
たって骨材としてのカーボンは欠くことのできない成分
である。2. Description of the Related Art In continuous casting of steel, it prevents oxidation of molten steel in a mold, dissolves and absorbs oxides and sulfides that float or are formed on the molten metal surface, and lubricates between the mold and the slab. Mold powder (hereinafter, also simply referred to as powder) is added to the molten metal surface in the mold for the purpose of maintaining good properties. The conventional mold powder for continuous casting is CaO-SiO 2 -Al 2
O 3 is used as a base material, and alkali metal oxides are added as fluorides or carbonates or CaF 2 is added to adjust the freezing point and viscosity. Also, carbon as an aggregate
The melting rate of the powder is adjusted by adding. This is because when the powder is used, its melting rate becomes a big problem, and if carbon as an aggregate is not present, the powder will melt rapidly and cannot cover the molten metal surface. In other words, carbon as an aggregate is an essential component for producing powder.
【０００３】しかし、極低炭素鋼の連続鋳造において
は、この骨材としての炭素が鋳造中に溶融パウダーから
鋳片に移行し、このため、溶鋼中の炭素濃度が上昇する
という問題が起こっている。骨材としての炭素の溶融パ
ウダーから溶鋼への移行を防止するための対策は未だ確
立されておらず、高価なBNなどの窒化物を炭素の代替材
料として一部添加した極低炭パウダーを使用することに
よって溶鋼中の炭素濃度の上昇を防止するという方策を
とらざるを得ない（例えば、鉄と鋼 第64年 (1978) 第
10号1548〜1557頁参照）。However, in the continuous casting of ultra-low carbon steel, the carbon as the aggregate migrates from the molten powder to the slab during the casting, which causes a problem that the carbon concentration in the molten steel increases. There is. Measures to prevent the transition of molten carbon from aggregate powder to molten steel as an aggregate have not yet been established, and ultra-low carbon powder partially added with expensive nitrides such as BN as a substitute for carbon is used. In order to prevent the increase of carbon concentration in molten steel, it is inevitable to take measures (for example, iron and steel 64th (1978)
No. 10, pp. 1548-1557).
【０００４】[0004]
【発明が解決しようとする課題】本発明は、極低炭素鋼
を連続鋳造するにあたり、溶鋼中の炭素濃度を上昇させ
ることのない連続鋳造用モールドパウダーを提供するこ
とを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold powder for continuous casting that does not increase the carbon concentration in molten steel when continuously casting ultra low carbon steel.
【０００５】[0005]
【課題を解決するための手段】本発明は、モールドパウ
ダーに界面に集積する性質をもつ元素を添加することに
より溶鋼中への炭素の移行が抑制されるという新しい知
見に基づいてなされたもので、その要旨は「テルル酸化
物をTeO2として 0.2〜５wt％含有することを特徴とする
鋼の連続鋳造用モールドパウダー」にある。The present invention was made based on the new finding that the transfer of carbon into molten steel is suppressed by adding an element having a property of accumulating at the interface to mold powder. The gist thereof is "a mold powder for continuous casting of steel characterized by containing tellurium oxide as TeO 2 in an amount of 0.2 to 5 wt%."
【０００６】前記の界面に集積する性質をもつ元素と
は、スラグと金属との境界面、ガスと金属との境界面な
ど、異相の境界面（界面）に集結する性質をもつ元素
で、例えば、テルル（Te）の他、いおう（Ｓ）、酸素
（Ｏ）、セレン（Se）等があげられる。しかし、ＯやＳ
は鋼材の製造においては不純物として除去しなければな
らない元素であり、Seは毒性が強い。そこで、界面に集
積する性質をもつ元素としてTeを選択し、パウダー製造
の際、配合原料としてTeの酸化物（TeO 、TeO2、TeO
3等）あるいは複合酸化物 ( TeO・SiO2、2TeO・SiO2、4
TeO・3SiO2 等）を加え、パウダー中のTeの濃度が二酸
化テルル（TeO2）に換算して 0.2〜５wt％になるように
調整する。The element having a property of accumulating at the interface is an element having a property of condensing at a different phase interface (interface) such as a slag / metal interface, a gas / metal interface, and the like. , Tellurium (Te), sulfur (S), oxygen (O), selenium (Se), and the like. However, O and S
Is an element that must be removed as an impurity in the production of steel, and Se is highly toxic. Therefore, Te is selected as an element that has the property of accumulating at the interface, and Te oxides (TeO, TeO 2 , TeO) are used as a compounding raw material during powder production
3 ) or complex oxides (TeO ・ SiO 2 , 2TeO ・ SiO 2 , 4
TeO ・ 3SiO 2 etc.) is added to adjust the concentration of Te in the powder to be 0.2 to 5 wt% in terms of tellurium dioxide (TeO 2 ).
【０００７】添加するTeの酸化物や複合酸化物の粒度
は、あまり大きいと他の配合原料と均一に混合できない
ので、50μm 以下とするのが望ましい。If the particle size of the Te oxide or complex oxide to be added is too large, it cannot be uniformly mixed with other compounding raw materials, so it is desirable that the particle size be 50 μm or less.
【０００８】テルル酸化物を添加するベースのパウダー
としては、通常、極低炭素鋼用のパウダーとして使用さ
れる、例えばCaO-SiO2-Al2O3系のパウダーやCaO-SiO2を
ベースとしたパウダーを使用すればよい。The base powder to which tellurium oxide is added is usually used as a powder for ultra-low carbon steel, for example, CaO-SiO 2 -Al 2 O 3 -based powder or CaO-SiO 2 is used as a base powder. You can use the powder.
【０００９】[0009]
【作用】界面に集積する性質をもつ元素をモールドパウ
ダーに添加することにより溶融パウダーから溶鋼への炭
素の移行が抑制されるのは、パウダーに添加した前記の
元素が溶融パウダーと溶鋼の界面に集まり、溶融パウダ
ー中の炭素と溶鋼とが接触する面積を減少させることに
よるものと考えられる。[Function] The addition of an element having the property of accumulating at the interface to the mold powder suppresses the transfer of carbon from the molten powder to the molten steel because the above-mentioned elements added to the powder are present at the interface between the molten powder and the molten steel. It is considered that this is due to the fact that the area where the carbon in the molten powder and the molten steel come into contact with each other is reduced.
【００１０】図１に、従来のパウダー（表１のパウダー
Ａ）にTeO2を加え、パウダー中のTeO2含有量を６wt％ま
で変化させたパウダーを使用した場合の溶鉄中の炭素濃
度を示す。これは、Ar雰囲気下でタンマン炉を用いて電
解鉄を溶解し、1580℃の温度で溶鉄の上部からパウダー
を添加して溶鉄中の炭素濃度を求めた結果で、パウダー
添加前の溶鉄の化学組成は、重量％で、Ｃ：0.0016％、
Si：0.0016％、Mn：0.0011％、Ｐ：0.0014％、Ｓ：0.00
21％、Cu：0.0001％、Ｏ：0.032 ％、Ｎ：0.0012％であ
る。極低炭素鋼の炭素濃度の上限は 30ppmであるから、
この図から、パウダーのTeO2含有量が 0.2wt％以上にな
るようにTeO2をパウダーに加える必要があることがわか
る。また、TeO2を５wt％を超えて含有させても溶鋼中の
炭素濃度に変化はなく、効果の増大はみられない。FIG. 1 shows the carbon concentration in molten iron when TeO 2 was added to the conventional powder (Powder A in Table 1) and the TeO 2 content in the powder was changed to 6 wt%. .. This is the result of melting electrolytic iron using a Tammann furnace in an Ar atmosphere and adding the powder from the top of the molten iron at a temperature of 1580 ° C to determine the carbon concentration in the molten iron. The composition is% by weight, C: 0.0016%,
Si: 0.0016%, Mn: 0.0011%, P: 0.0014%, S: 0.00
21%, Cu: 0.0001%, O: 0.032%, N: 0.0012%. Since the upper limit of carbon concentration of ultra low carbon steel is 30ppm,
This figure shows that TeO 2 needs to be added to the powder so that the TeO 2 content of the powder is 0.2 wt% or more. Further, even if TeO 2 is contained in an amount of more than 5 wt%, the carbon concentration in the molten steel does not change and the effect is not increased.
【００１１】一方、パウダー中のTeO2の含有量を５％と
し、このパウダーをパウダー消費量0.4kg/tonで使用し
た時の溶鋼中のTe濃度を、パウダー中のTeが全て溶鋼中
に移行するとして計算すると、0.4 ×10-3×0.05×( 12
7.6/159.6 ) ×100 ＝0.0016(wt％) となる。TeとＳは
等価であるとみなすと、極低炭素鋼中のＳ濃度の上限は
0.006wt％であるから、極低炭素鋼中のTeの濃度は許容
範囲内であると言える。On the other hand, the content of TeO 2 in the powder was set to 5%, and the Te concentration in the molten steel when this powder was used at a powder consumption of 0.4 kg / ton, the Te in the powder was all transferred to the molten steel. When calculated as, 0.4 × 10 -3 × 0.05 × (12
7.6 / 159.6) x 100 = 0.0016 (wt%). Assuming that Te and S are equivalent, the upper limit of S concentration in ultra low carbon steel is
Since it is 0.006 wt%, it can be said that the Te concentration in the ultra-low carbon steel is within the allowable range.
【００１２】上記の理由から、極低炭素鋼の連続鋳造用
パウダーとしてはパウダー中のTeO2含有量を 0.2〜５wt
％とするのが適当であると判断される。TeO2源として
は、前記のように、TeO 、TeO2、TeO3、TeO ・SiO2、2T
eO・SiO2、4TeO・3SiO2 等のＴｅの酸化物やＴｅの複合
酸化物があげられる。For the above reasons, the TeO 2 content in the powder is 0.2 to 5 wt as a powder for continuous casting of ultra-low carbon steel.
It is determined that the appropriate value is%. As the TeO 2 source, as described above, TeO, TeO 2 , TeO 3 , TeO.SiO 2 , 2T
Examples thereof include Te oxides such as eO.SiO 2 and 4TeO / 3SiO 2 and Te complex oxides.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【実施例】湾曲半径10ｍの１点矯正連続鋳造機におい
て、スラブサイズ1600mm×250mm の鋳型で表２に示す溶
鋼（鋳込み前、炭素濃度19ppm)を鋳造速度２m/分で鋳造
するに際し、パウダーとして表１に示した従来のパウダ
ーＡと、このパウダーをベースとしてTeO2を２wt％含有
させた本発明のパウダーＢを用い、テストを行った。[Example] In a 1-point straightening continuous casting machine with a bending radius of 10 m, molten steel shown in Table 2 (before casting, carbon concentration 19 ppm) was cast at a casting speed of 2 m / min in a mold with a slab size of 1600 mm x 250 mm, as a powder. Tests were conducted using the conventional powder A shown in Table 1 and the powder B of the present invention containing 2 wt% of TeO 2 based on this powder.
【００１５】鋳造作業はいずれもブレークアウトなどの
事故がなく、順調であった。All casting operations were successful without any accident such as breakout.
【００１６】テストの結果、表２に示すように、従来の
パウダーＡを使用した場合はスラブの炭素量は105ppm
（0.0105wt％）になったが、本発明のパウダーＢを使用
した場合は25ppm(0.0025wt％) で、従来のパウダーＡを
用いた場合に比べて大幅に低下した。As a result of the test, as shown in Table 2, when the conventional powder A was used, the carbon content of the slab was 105 ppm.
However, when the powder B of the present invention was used, it was 25 ppm (0.0025 wt%), which was significantly lower than that when the conventional powder A was used.
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【発明の効果】本発明のモールドパウダーは従来の炭素
を骨材として含有するモールドパウダーにTeO2を少量含
有させたもので、溶融パウダーから溶鋼への炭素の移行
を大幅に抑制することができ、極低炭素鋼の連続鋳造用
パウダーとして好適である。EFFECTS OF THE INVENTION The mold powder of the present invention is a conventional mold powder containing carbon as an aggregate and a small amount of TeO 2, and can significantly suppress the transfer of carbon from molten powder to molten steel. Suitable as powder for continuous casting of ultra low carbon steel.
【図１】パウダーのTeO2含有量と溶鋼中の炭素濃度との
関係を示す図である。FIG. 1 is a diagram showing the relationship between the TeO 2 content of powder and the carbon concentration in molten steel.
Claims (1)
有することを特徴とする鋼の連続鋳造用モールドパウダ
ー。1. A mold powder for continuous casting of steel, characterized by containing tellurium oxide as TeO 2 in an amount of 0.2 to 5 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24862491A JPH0584553A (en) | 1991-09-27 | 1991-09-27 | Mold powder for continuously casting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24862491A JPH0584553A (en) | 1991-09-27 | 1991-09-27 | Mold powder for continuously casting steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0584553A true JPH0584553A (en) | 1993-04-06 |
Family
ID=17180885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24862491A Pending JPH0584553A (en) | 1991-09-27 | 1991-09-27 | Mold powder for continuously casting steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0584553A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6164070A (en) * | 1997-10-16 | 2000-12-26 | Jidosha Kiki Co., Ltd. | Hydraulic pressure type booster |
| JP2012213784A (en) * | 2011-03-31 | 2012-11-08 | Nippon Steel Corp | Continuous casting method of copper |
| CN105436447A (en) * | 2016-01-26 | 2016-03-30 | 中南大学 | Tundish covering agent for continuous casting of low-carbon steel containing Al and Ti and application thereof |
| CN106111952A (en) * | 2016-08-15 | 2016-11-16 | 长兴明晟冶金炉料有限公司 | A kind of mould steel ingot casting powder |
| CN108348992A (en) * | 2015-11-05 | 2018-07-31 | 新日铁住金株式会社 | Continuously casting covering slag and continuous casing |
-
1991
- 1991-09-27 JP JP24862491A patent/JPH0584553A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6164070A (en) * | 1997-10-16 | 2000-12-26 | Jidosha Kiki Co., Ltd. | Hydraulic pressure type booster |
| JP2012213784A (en) * | 2011-03-31 | 2012-11-08 | Nippon Steel Corp | Continuous casting method of copper |
| CN108348992A (en) * | 2015-11-05 | 2018-07-31 | 新日铁住金株式会社 | Continuously casting covering slag and continuous casing |
| US11453048B2 (en) | 2015-11-05 | 2022-09-27 | Nippon Steel Corporation | Mold flux for continuous casting and continuous casting method |
| CN105436447A (en) * | 2016-01-26 | 2016-03-30 | 中南大学 | Tundish covering agent for continuous casting of low-carbon steel containing Al and Ti and application thereof |
| CN106111952A (en) * | 2016-08-15 | 2016-11-16 | 长兴明晟冶金炉料有限公司 | A kind of mould steel ingot casting powder |
| CN106111952B (en) * | 2016-08-15 | 2018-08-07 | 长兴明晟冶金炉料有限公司 | A kind of mould steel ingot casting powder |
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