JPH05208250A - Casting mold additive for continuous casting of steel - Google Patents
Casting mold additive for continuous casting of steelInfo
- Publication number
- JPH05208250A JPH05208250A JP1660492A JP1660492A JPH05208250A JP H05208250 A JPH05208250 A JP H05208250A JP 1660492 A JP1660492 A JP 1660492A JP 1660492 A JP1660492 A JP 1660492A JP H05208250 A JPH05208250 A JP H05208250A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- weight
- cao
- sio
- fluorine
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造において
鋳型内に散布して使用される鋼の連続鋳造用鋳型添加剤
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold additive for continuous casting of steel, which is used by being dispersed in a mold in continuous casting of steel.
【０００２】[0002]
【従来の技術】鋼の連続鋳造用鋳型添加剤(以下、パウ
ダーと略称する)はポルトランドセメント、黄燐スラ
グ、合成珪酸カルシウム、ウォラストナイトなどを主原
料とし、必要に応じてＳｉＯ2質原料を加え、更に、ソ
ーダ灰や蛍石などのフラックス原料、溶融速度調整剤と
しての炭素質原料を添加したものが一般的である。BACKGROUND ART steel continuous casting mold additive (hereinafter, powder and abbreviated) is Portland cement, white phosphorus slag, synthetic calcium silicate, wollastonite, etc. as a main raw material, a SiO 2 feedstocks optionally In addition, a flux material such as soda ash or fluorite and a carbonaceous material as a melting rate adjusting agent are generally added.
【０００３】パウダーは鋳型内へ注入された溶鋼表面上
へ添加され、種々の役割を果たしながら消費される。特
に、鋳型と凝固シェルの潤滑、溶鋼から浮上する介
在物の溶解及び吸収、溶鋼の保温などが主要な役割で
ある。とはパウダーの軟化点、粘度などを調整する
ことが必要であり、化学組成の選定が肝要である。ま
た、の溶鋼保温については主に炭素質原料によって調
整される溶融速度や嵩比重、拡がり性などの粉体特性が
重要とされている。Powder is added on the surface of molten steel injected into a mold and consumed while playing various roles. In particular, the main roles are the lubrication of the mold and the solidified shell, the dissolution and absorption of inclusions floating from the molten steel, and the heat retention of the molten steel. It is necessary to adjust the softening point and viscosity of the powder, and it is important to select the chemical composition. Further, regarding the heat retention of the molten steel, it is considered that the powder characteristics such as the melting rate, bulk specific gravity and spreadability which are mainly adjusted by the carbonaceous raw material are important.
【０００４】我が国における連続鋳造技術の進展は目覚
ましく、粗鋼の９５％以上が連続鋳造によって生産され
ている。更に、ＨＣＲ(ホットチャージ)、ＨＤＲ(ホッ
トダイレクトローリング)比率の向上、高速鋳造などが
積極的に進められている。従って、鋳片品質や操業安定
度に多大な影響を与えるパウダーに対する要求も一段と
厳しいものがあり、必要とされるパウダーも多種、多様
となっている。The progress of continuous casting technology in Japan is remarkable, and 95% or more of crude steel is produced by continuous casting. Furthermore, improvement of HCR (hot charge) and HDR (hot direct rolling) ratios and high-speed casting are being actively promoted. Therefore, there are more stringent requirements for powders that have a great influence on the quality of cast slabs and the stability of operation, and the types of powders required are also diverse.
【０００５】[0005]
【発明が解決しようとする課題】現在、使用されている
ほとんどのパウダーは融剤としてＣａＦ2、ＮａＦ、Ｎ
ａ3ＡｌＦ6などのフッ化物を含んでおり、次のような問
題点を有している。パウダーは鋳型内で溶鋼と接して溶
融し、鋳片と鋳型間に生じる間隙へ流入し潤滑剤として
消費されるが、フッ素を含有するため鋳型下で２次冷却
水と接触した際、冷却水のｐＨを著しく低下させ冷却水
と接する連鋳機周辺の設備、特にロール、配管、ノズル
などの金属製構造物を腐食させるという問題を起こして
いる。更に、スラグから蒸発するフッ素ガスは農作物や
人体にも悪影響を及ぼす可能性があり、環境上問題があ
ると考えられる。Most of the powders used at present are CaF 2 , NaF and N as fluxing agents.
Since it contains a fluoride such as a 3 AlF 6, it has the following problems. The powder melts in contact with molten steel in the mold and flows into the gap between the slab and the mold to be consumed as a lubricant. However, since it contains fluorine, the cooling water comes into contact with the secondary cooling water under the mold. Has a problem of corroding the facilities around the continuous casting machine, especially the metal structures such as rolls, pipes and nozzles, which come into contact with cooling water by significantly lowering the pH. Further, the fluorine gas evaporated from the slag may adversely affect agricultural crops and the human body, which is considered to be an environmental problem.
【０００６】一方、近年の高速鋳造化は著しくスラブ連
鋳でも１.５〜３.０ｍ／分の高速鋳造が実施されてい
る。このような条件下で使用されるパウダーは周知の通
り、より低粘度化が必要であり、従来のパウダーより多
量のフッ素を含有せしめる傾向がある。その結果、前記
した問題が深刻化し、更に、浸漬ノズルの溶損速度を増
大させるという新たな問題を引き起こしている。浸漬ノ
ズルはパウダースラグと接触する部分が損傷し易いた
め、パウダースラグに対する溶解どの低いＺｒＯ2−Ｃ
(カーボン)材質で補強されたものが一般的であるが、フ
ッ素含有量の高いパウダースラグに対しては必ずしも充
分な耐用を示さない傾向がある。従って、高速鋳造の多
連鋳を実施する上でもフッ素を含まないパウダーの開発
が必要である。On the other hand, high-speed casting has been remarkable in recent years, and high-speed casting of 1.5 to 3.0 m / min has been carried out even in slab continuous casting. As is well known, powders used under such conditions need to have a lower viscosity and tend to contain a larger amount of fluorine than conventional powders. As a result, the above-mentioned problem is exacerbated, and a new problem of increasing the melting loss rate of the immersion nozzle is caused. Since the part of the immersion nozzle that is in contact with the powder slag is easily damaged, it dissolves into the powder slag and has low ZrO 2 -C
Although it is generally reinforced with a (carbon) material, there is a tendency that the powder slag having a high fluorine content does not always have sufficient durability. Therefore, it is necessary to develop a powder that does not contain fluorine even when performing continuous casting of high speed casting.
【０００７】フッ素によるこれらの問題点を解決するた
めに、特開昭50−86423号、特開昭51−132113号、特公
昭56−137489号公報、特開昭51−93728号及び特開昭58
−125349号などが提案されている。しかし、現在でもフ
ッ化物を添加したパウダーが主流になっており、実使用
可能な無フッ素パウダーの開発が強く望まれている。In order to solve these problems caused by fluorine, JP-A-50-86423, JP-A-51-132113, JP-B-56-137489, JP-A-51-93728, and JP-A-51-93728 are proposed. 58
No.-125349 is proposed. However, powders containing fluoride are still in the mainstream, and there is a strong demand for the development of fluorine-free powders that can be used in practice.
【０００８】例えば、特開昭51−19123号公報では、フ
ッ素の代替としてＭｎＯやＦｅ2Ｏ3の使用が提案されて
いるが、ＭｎＯは浸漬ノズルの溶損を大きくし、Ｆｅ2
Ｏ3は溶鋼成分を酸化させるという欠点を有している。For example, Japanese Patent Application Laid-Open No. 51-19123 proposes the use of MnO or Fe 2 O 3 as a substitute for fluorine, but MnO increases the melting loss of the immersion nozzle, and Fe 2
O 3 has the disadvantage of oxidizing molten steel components.
【０００９】また、特開昭58−125349号公報ではＮａ2
Ｏ、Ｋ2Ｏ、Ｌｉ2Ｏのみによって溶融特性を調整する方
法も提案されているが、これらの成分だけでは粘性と溶
融点のバランスが取れないなどの技術的問題点があり、
充分な対策とは言い難い。Further, in JP-A-58-125349, Na 2
Although a method of adjusting the melting characteristics by only O, K 2 O, and Li 2 O has been proposed, there are technical problems such that the viscosity and the melting point cannot be balanced only by these components,
It is hard to say that it is a sufficient measure.
【００１０】また、特公昭56−29733号公報では、Ｂ2Ｏ
3の添加を提案しているが、ＣａＯ／ＳｉＯ2重量比を
０.８〜１.２としているため、フッ化物の添加無しでは
低粘度のパウダーを得難く、適用範囲は低速鋳造に限ら
れているという欠点がある。In Japanese Patent Publication No. 56-29733, B 2 O
Although the addition of 3 is proposed, the CaO / SiO 2 weight ratio is set to 0.8 to 1.2, so it is difficult to obtain a low-viscosity powder without adding fluoride, and the applicable range is limited to low-speed casting. There is a drawback that
【００１１】従って、本発明の目的はフッ化物を含ま
ず、環境汚染の心配がなく、フッ素による連鋳機周辺設
備の腐食がなく、かつフッ素による浸漬ノズルの損傷を
防止できるパウダーを提供することにある。Therefore, an object of the present invention is to provide a powder which does not contain fluoride, does not cause environmental pollution, does not corrode the peripheral equipment of the continuous casting machine due to fluorine, and can prevent damage to the immersion nozzle due to fluorine. It is in.
【００１２】[0012]
【課題を解決するための手段】本発明者らは前記したフ
ッ素が原因となる問題点を解決すべく種々検討した結
果、従来使用されているパウダーと同等の溶融挙動を示
すフッ化物無添加パウダーを見出した。DISCLOSURE OF THE INVENTION As a result of various investigations by the present inventors to solve the above-mentioned problems caused by fluorine, a fluoride-free powder showing a melting behavior equivalent to that of a conventionally used powder. Found.
【００１３】即ち、本発明に係るパウダーは、化学組成
としてＣａＯ３０〜４５重量％、ＳｉＯ2２０〜３５重
量％、ここでＣａＯ／ＳｉＯ2の重量比は１.２５〜２.
０の範囲内にある、Ａｌ2Ｏ3８重量％以下、Ｂ2Ｏ3２〜
１５重量％、Ｎａ2Ｏ、Ｋ2Ｏ、Ｌｉ2Ｏのいずれか１種
以上が３〜２５重量％、ＭｇＯ１〜１０重量％及び炭素
質原料０.５〜８重量％を有することを特徴とする。That is, the powder according to the present invention has a chemical composition of 30 to 45% by weight of CaO and 20 to 35% by weight of SiO 2 , wherein the weight ratio of CaO / SiO 2 is 1.25 to 2 .
Within the range of 0, Al 2 O 3 8% by weight or less, B 2 O 3 2
15% by weight, at least one of Na 2 O, K 2 O and Li 2 O has 3 to 25% by weight, MgO 1 to 10% by weight and carbonaceous material 0.5 to 8% by weight. To do.
【００１４】[0014]
【作用】フッ素は主にパウダーの粘性を下げるために添
加されている。本発明によるパウダーはフッ化物を添加
せずに粘性を下げる方法として、ＣａＯ／ＳｉＯ2の重
量比を１.２５〜２.００の範囲内としている。即ち、図
１に示すようにパウダーの基本組成であるＣａＯ−Ａｌ
2Ｏ3−ＳｉＯ2系では、スラグのＣａＯ／ＳｉＯ2重量比
が高くなるに従いスラグの粘性が低下することに着目し
たものである。[Function] Fluorine is mainly added to reduce the viscosity of the powder. The powder according to the present invention has a CaO / SiO 2 weight ratio in the range of 1.25 to 2.00 as a method for reducing the viscosity without adding a fluoride. That is, as shown in FIG. 1, the basic composition of the powder is CaO-Al.
In the 2 O 3 —SiO 2 system, the viscosity of the slag decreases as the CaO / SiO 2 weight ratio of the slag increases.
【００１５】しかし、一般には、ＣａＯ／ＳｉＯ2重量
比が高くなると結晶化温度や融点が上昇し、潤滑性が損
なわれるという問題点が発生する。従って、従来のパウ
ダーはＣａＯ／ＳｉＯ2重量比が１.０前後あるいはそれ
以下に調整されるのが一般的であった。本発明者らはパ
ウダースラグの結晶化傾向を緩和できる成分として特に
有効であるＢ2Ｏ3を添加することにより高ＣａＯ／Ｓｉ
Ｏ2スラグの結晶化傾向を抑制し、３〜２５重量％のア
ルカリ金属例えばＮａ、Ｋ、Ｌｉの酸化物と１〜１０重
量％のＭｇＯを添加することにより主に軟化点、融点を
調整し、更に、溶融速度調整を目的として炭素質原料を
０.５〜８重量％添加することにより、従来の含フッ化
物パウダーと同等の溶融性状が得られることを見出し
た。However, in general, when the CaO / SiO 2 weight ratio is increased, the crystallization temperature and the melting point are increased and the lubricity is impaired. Therefore, the conventional powder is generally adjusted to have a CaO / SiO 2 weight ratio of about 1.0 or less. The present inventors added high CaO / Si by adding B 2 O 3 , which is particularly effective as a component capable of relaxing the crystallization tendency of powder slag.
The softening point and melting point are mainly adjusted by suppressing the crystallization tendency of O 2 slag and adding 3 to 25% by weight of an alkali metal oxide such as Na, K and Li and 1 to 10% by weight of MgO. Furthermore, it was found that by adding 0.5 to 8% by weight of a carbonaceous raw material for the purpose of adjusting the melting rate, a melting property equivalent to that of a conventional fluoride-containing powder can be obtained.
【００１６】ここで、パウダーの化学組成を規定する理
由について述べる。まず、ＣａＯは３０〜４５重量％の
範囲とし、ＳｉＯ2は２０〜３５重量％の範囲内とす
る。ここで、ＣａＯ／ＳｉＯ2重量比は１.２５〜２.０
０とする。このＣａＯ／ＳｉＯ2重量比が１.２５未満で
は粘性が充分に低下せず、また、該重量比が２.００を
超えると結晶化温度や溶融温度が高くなりすぎるため好
ましくない。なお、ＣａＯ／ＳｉＯ2重量比がこの範囲
以外でも、過剰のフラックス原料を添加すれば粘性や溶
融温度を調整することは可能であるが、経済的な問題や
粘性と溶融温度のバランスが悪くなるという問題を生じ
る。即ち、ＣａＯ／ＳｉＯ2重量比が１.２５未満では溶
融温度が下がりすぎ、２.００を超えると粘性が低くな
り過ぎる傾向がある。Now, the reason for defining the chemical composition of powder will be described. First, CaO is in the range of 30 to 45% by weight, and SiO 2 is in the range of 20 to 35% by weight. Here, the CaO / SiO 2 weight ratio is 1.25 to 2.0.
Set to 0. When the CaO / SiO 2 weight ratio is less than 1.25, the viscosity is not sufficiently lowered, and when the weight ratio exceeds 2.00, the crystallization temperature and the melting temperature are too high, which is not preferable. Even if the CaO / SiO 2 weight ratio is outside this range, it is possible to adjust the viscosity and melting temperature by adding an excess amount of flux raw material, but it is economically problematic and the balance between viscosity and melting temperature becomes poor. Causes the problem. That is, if the CaO / SiO 2 weight ratio is less than 1.25, the melting temperature tends to be too low, and if it exceeds 2.00, the viscosity tends to be too low.
【００１７】高濃度のＡｌ2Ｏ3は高塩基度スラグの場合
比較的高融点の２ＣａＯ・Ａｌ2Ｏ3・ＳｉＯ2を生成さ
せるためなるべく少ない方が良い。即ち、パウダーの化
学組成におけるＡｌ2Ｏ3は８重量％以下が良い。The high concentration of Al 2 O 3 is as small as possible it is better for generating 2CaO · Al 2 O 3 · SiO 2 where relatively high melting point of the high-basicity slag. That is, Al 2 O 3 in the chemical composition of the powder is preferably 8% by weight or less.
【００１８】Ｂ2Ｏ3はＣａＯ・Ａｌ2Ｏ3・ＳｉＯ2系ス
ラグの結晶化傾向を抑制するという特徴があり、パウダ
ーの化学組成において２〜１５重量％の範囲が好まし
い。ＣａＯ／ＳｉＯ2重量比が１.２５以上の場合、Ｂ2
Ｏ3の添加量が２重量％未満では効果を得られないこと
があり、また、１５重量％を超えても期待するほどの効
果は認められない。本発明者らの実験ではＣａＯ／Ｓｉ
Ｏ2重量比が１.２５の場合のＢ2Ｏ3添加量は２重量％以
上、該重量比１.５０では３重量％以上、該重量比１.７
５では４重量％以上が必要であり、パウダーの化学組成
におけるＢ2Ｏ3量は当然ながら塩基度によって異なる。
図２にＢ2Ｏ3の適正量を示す。B 2 O 3 is characterized in that it suppresses the crystallization tendency of CaO.Al 2 O 3 .SiO 2 slag, and the chemical composition of the powder is preferably in the range of 2 to 15% by weight. When the CaO / SiO 2 weight ratio is 1.25 or more, B 2
If the amount of O 3 added is less than 2% by weight, the effect may not be obtained, and if it exceeds 15% by weight, the expected effect is not observed. In our experiments, CaO / Si
When the weight ratio of O 2 is 1.25, the addition amount of B 2 O 3 is 2% by weight or more, and when the weight ratio of 1.50 is 3% by weight or more, the weight ratio of 1.7
No. 5 requires 4% by weight or more, and the B 2 O 3 amount in the chemical composition of the powder naturally depends on the basicity.
FIG. 2 shows the proper amount of B 2 O 3 .
【００１９】主に軟化温度、溶融温度を調整するため
に、ＭｇＯ１〜１０重量％及びアルカリ金属酸化物例え
ばＮａ2Ｏ、Ｋ2Ｏ、Ｌｉ2Ｏのいずれか１種以上３〜２
５重量％の化学組成とするが、ＭｇＯが１０重量％を超
えると結晶化傾向が強くなり、アルカリ金属酸化物が２
５重量％を超えると溶融温度が低すぎたり、浸漬ノズル
の溶損の問題を生じ、また、３重量％未満では効果は認
められない。これらと同様の添加目的あるいは原料に付
随して混入する他の成分、例えばＭｎＯ、ＴｉＯ2など
もパウダー中に存在していてもよいが、ＭｎＯが過剰に
存在すると浸漬ノズルの溶損を大きくする。ＴｉＯ2は
スラグ中に高融点のＣａＯ・ＴｉＯ2を生成し、結晶化
温度を上昇させる欠点を有しており、過剰の存在は好ま
しくない。従って、パウダー中のＭｎＯ、ＴｉＯ2は共
に５重量％以下に抑えることが好ましい。Mainly in order to adjust the softening temperature and the melting temperature, 1 to 10% by weight of MgO and one or more of alkali metal oxides such as Na 2 O, K 2 O and Li 2 O 3 to 2
The chemical composition is 5% by weight, but if MgO exceeds 10% by weight, the crystallization tendency becomes strong and the alkali metal oxide is 2% by weight.
If it exceeds 5% by weight, the melting temperature will be too low, and problems such as melting damage of the immersion nozzle will occur, and if it is less than 3% by weight, no effect will be observed. Although other components similar to these, which are mixed together with the purpose of addition or the raw materials, such as MnO and TiO 2 , may be present in the powder, too much MnO increases the erosion loss of the immersion nozzle. .. TiO 2 has a drawback that it forms CaO · TiO 2 having a high melting point in the slag and raises the crystallization temperature, and its presence is not preferable. Therefore, it is preferable that both MnO and TiO 2 in the powder be suppressed to 5% by weight or less.
【００２０】また、ＢａＯはＢ2Ｏ3と同様結晶化温度を
下げる効果があるが、Ｂ2Ｏ3程の効果はなく、また、原
料として使用する炭酸バリウムは人体への影響があり、
多量の存在は好ましくない。従って、本発明のパウダー
において、ＢａＯ量は３重量％を上限とすべきである。Further, BaO is an effect of lowering the same crystallization temperature and B 2 O 3, B 2 O 3 rather than the effect of the extent, also, barium carbonate to be used as raw material affects on the human body,
The presence of a large amount is not preferable. Therefore, in the powder of the present invention, the upper limit of the amount of BaO should be 3% by weight.
【００２１】Ｆｅ2Ｏ3は鋼を酸化するため３重量％以下
が好ましい。Since Fe 2 O 3 oxidizes the steel, it is preferably contained in an amount of 3% by weight or less.
【００２２】炭素質原料はパウダーの溶融速度調整のた
め添加するが、０.５重量％未満では効果がなく、８重
量％を超えると溶融速度が遅くなりすぎるため０.５〜
８重量％が好ましい。The carbonaceous raw material is added to adjust the melting rate of the powder, but if it is less than 0.5% by weight, it has no effect, and if it exceeds 8% by weight, the melting rate becomes too slow, so that it is 0.5-0.5.
8% by weight is preferred.
【００２３】本発明のパウダーはＮａＦやＣａＦ2など
のフッ化物を含まないため、パウダー中のフッ素は極め
て少ない。また、原料に付随し不可避的に混入したフッ
素の合計量が１重量％以下であれば本発明の意図するパ
ウダーが得られる。Since the powder of the present invention does not contain fluorides such as NaF and CaF 2 , the powder contains very little fluorine. Further, if the total amount of fluorine incidentally included in the raw materials and unavoidably mixed is 1% by weight or less, the powder intended by the present invention can be obtained.
【００２４】本発明によるパウダーは上述のような化学
組成になるように各原料を配合したのち、Ｖ型ミキサー
やナウタミキサーなどで均一に混合することにより得ら
れる(粉末パウダー)。また、原料混合物を加水混練し、
押出造粒機によって柱状の顆粒を得たり、混合物をスラ
リー化したのち、スプレー造粒法により球状のパウダー
を得ることもできる。The powder according to the present invention is obtained by blending the respective raw materials so as to have the above-mentioned chemical composition and then uniformly mixing them with a V-type mixer or a Nauta mixer (powder powder). Also, the raw material mixture is hydro-kneaded,
It is also possible to obtain columnar granules by an extrusion granulator or to make a slurry of the mixture and then obtain a spherical powder by a spray granulation method.
【００２５】なお、本発明によるパウダーは以下に示す
ような一般に使用されている原料で構成できる。 基材原料：ポルトランドセメント、ウォラストナイト、
合成珪酸カルシウムなど ＳｉＯ2原料：パーライト、フライアッシュなど Ｎａ2Ｏ、Ｋ2Ｏ、Ｌｉ2Ｏ原料：炭酸塩、ガラス粉、フ
リット粉 ＭｇＯ原料：炭酸塩、海水ＭｇＯ粉、ドロマイト粉など Ｂ2Ｏ3原料：硼砂、コレマナイト、ガラス粉、フリット
粉など 炭素質原料：コークス粉、りん状黒鉛、カーボンブラッ
クなどThe powder according to the present invention can be composed of the following commonly used raw materials. Base material: Portland cement, wollastonite,
Synthetic calcium silicate, etc. SiO 2 raw material: perlite, fly ash, etc. Na 2 O, K 2 O, Li 2 O raw material: carbonate, glass powder, frit powder MgO raw material: carbonate, seawater MgO powder, dolomite powder, etc. B 2 O 3 Raw materials: Borax, Colemanite, Glass powder, Frit powder, etc. Carbonaceous materials: Coke powder, Phosphorous graphite, Carbon black, etc.
【００２６】[0026]
【実施例】以下に実施例を挙げて本発明のパウダーを更
に説明する。 実施例 以下の表１に従来品及び本発明品のパウダーの配合例、
化学成分並びに諸特性を記載する。EXAMPLES The powder of the present invention will be further described below with reference to examples. Examples Table 1 below shows examples of powder formulations of the conventional product and the product of the present invention,
Describe the chemical composition and various properties.
【００２７】[0027]
【表１】 [Table 1]
【００２８】表１の配合中、ケイ酸カルシウムＡはＣａ
Ｏ／ＳｉＯ2＝１.１、Ｆｅ2Ｏ3＝２.５〜３％、ケイ酸
カルシウムＢはＣａＯ／ＳｉＯ2＝２.９、Ｆｅ2Ｏ3＝０
％の組成を有するものであり、「アルカリ金属炭酸塩」
とはＮａ2ＣＯ3、Ｌｉ2ＣＯ3、Ｋ2ＣＯ3などを示す。更
に、化学成分中、「その他」とはＣＯ2、ＴｉＯ2、Ｍｎ
Ｏ、Ｐ、Ｓなどを示し、「アルカリ金属酸化物」とはＮ
ａ2Ｏ、Ｌｉ2Ｏ、Ｋ2Ｏを示す。In the formulation of Table 1, calcium silicate A is Ca
O / SiO 2 = 1.1, Fe 2 O 3 = 2.5-3%, calcium silicate B has CaO / SiO 2 = 2.9, Fe 2 O 3 = 0.
% Alkali metal carbonate
Means Na 2 CO 3 , Li 2 CO 3 , K 2 CO 3 and the like. Further, among the chemical components, “other” means CO 2 , TiO 2 , Mn.
Indicates O, P, S, etc., and "alkali metal oxide" is N
a 2 O, Li 2 O, shows a K 2 O.
【００２９】[0029]
【発明の効果】本発明によるパウダーはフッ化物を含ま
ないため、以下の特徴を有する： フッ素による環境汚染がない(人体、農作物への影
響)； フッ素による連鋳機周辺設備の腐食がない； フッ素による浸漬ノズルの損傷を防止できる。EFFECTS OF THE INVENTION The powder according to the present invention does not contain fluoride, and therefore has the following characteristics: No environmental pollution by fluorine (effect on human body and agricultural products); No corrosion of peripheral equipment of continuous casting machine by fluorine; It is possible to prevent the immersion nozzle from being damaged by fluorine.
【図１】スラグのＣａＯ／ＳｉＯ2重量比と粘度の関係
を示す図である。FIG. 1 is a diagram showing the relationship between the CaO / SiO 2 weight ratio and the viscosity of slag.
【図２】パウダーのＣａＯ／ＳｉＯ2重量比とＢ2Ｏ3存
在量の適正量を示す図である。FIG. 2 is a diagram showing an appropriate amount of CaO / SiO 2 weight ratio and B 2 O 3 existing amount of powder.
Claims (1)
％、ＳｉＯ2２０〜３５重量％、ここでＣａＯ／ＳｉＯ2
の重量比は１.２５〜２.０の範囲内にある、Ａｌ2Ｏ3８
重量％以下、Ｂ2Ｏ3２〜１５重量％、Ｎａ2Ｏ、Ｋ2Ｏ、
Ｌｉ2Ｏのいずれか１種以上が３〜２５重量％、ＭｇＯ
１〜１０重量％及び炭素質原料０.５〜８重量％を有す
ることを特徴とする鋼の連続鋳造用鋳型添加剤。1. The chemical composition of CaO is 30 to 45 wt%, SiO 2 is 20 to 35 wt%, where CaO / SiO 2
The weight ratio of Al 2 O 3 is in the range of 1.25 to 2.0.
% By weight, B 2 O 3 2 to 15% by weight, Na 2 O, K 2 O,
Any one or more of Li 2 O, 3 to 25% by weight, MgO
1 to 10% by weight and 0.5 to 8% by weight of carbonaceous raw material, a mold additive for continuous casting of steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04016604A JP3081339B2 (en) | 1992-01-31 | 1992-01-31 | Mold additive for continuous casting of steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04016604A JP3081339B2 (en) | 1992-01-31 | 1992-01-31 | Mold additive for continuous casting of steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05208250A true JPH05208250A (en) | 1993-08-20 |
| JP3081339B2 JP3081339B2 (en) | 2000-08-28 |
Family
ID=11920907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04016604A Expired - Lifetime JP3081339B2 (en) | 1992-01-31 | 1992-01-31 | Mold additive for continuous casting of steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3081339B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045608A1 (en) * | 2001-11-29 | 2003-06-05 | Shinagawa Refractories Co., Ltd. | Method for continuous casting of steel |
| JP2006007316A (en) * | 2004-06-23 | 2006-01-12 | Stollberg & Samil Co Ltd | Mold flux containing no fluorine component for continuous steel casting |
| JP2010042425A (en) * | 2008-08-12 | 2010-02-25 | Nippon Steel & Sumikin Metal Products Co Ltd | Mold powder for continuously casting steel |
| CN102059330A (en) * | 2011-02-15 | 2011-05-18 | 江苏大学 | Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof |
| WO2013139269A1 (en) * | 2012-03-22 | 2013-09-26 | 宝山钢铁股份有限公司 | Low-carbon steel fluoride-free continuous casting mold powder |
| CN104511581A (en) * | 2013-09-30 | 2015-04-15 | 上海梅山钢铁股份有限公司 | Molten steel fluxing agent for cold-rolled tin plate |
| JP2017051971A (en) * | 2015-09-08 | 2017-03-16 | 新日鐵住金株式会社 | Powder for continuous casting of steel, and continuous casting method of steel |
| CN110614351A (en) * | 2019-10-30 | 2019-12-27 | 江苏理工学院 | Continuous casting covering slag for stainless steel and preparation method thereof |
-
1992
- 1992-01-31 JP JP04016604A patent/JP3081339B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045608A1 (en) * | 2001-11-29 | 2003-06-05 | Shinagawa Refractories Co., Ltd. | Method for continuous casting of steel |
| JP2006007316A (en) * | 2004-06-23 | 2006-01-12 | Stollberg & Samil Co Ltd | Mold flux containing no fluorine component for continuous steel casting |
| JP2010042425A (en) * | 2008-08-12 | 2010-02-25 | Nippon Steel & Sumikin Metal Products Co Ltd | Mold powder for continuously casting steel |
| CN102059330A (en) * | 2011-02-15 | 2011-05-18 | 江苏大学 | Boron-containing fluoride-free covering slag for steel continuous-casting crystallizer and preparation method thereof |
| WO2013139269A1 (en) * | 2012-03-22 | 2013-09-26 | 宝山钢铁股份有限公司 | Low-carbon steel fluoride-free continuous casting mold powder |
| US10092948B2 (en) | 2012-03-22 | 2018-10-09 | Baoshan Iron & Steel Co. Ltd | Fluoride-free continuous casting mold flux for low-carbon steel |
| CN104511581A (en) * | 2013-09-30 | 2015-04-15 | 上海梅山钢铁股份有限公司 | Molten steel fluxing agent for cold-rolled tin plate |
| CN104511581B (en) * | 2013-09-30 | 2018-07-27 | 上海梅山钢铁股份有限公司 | A kind of cold rolling tin plate molten steel flux |
| JP2017051971A (en) * | 2015-09-08 | 2017-03-16 | 新日鐵住金株式会社 | Powder for continuous casting of steel, and continuous casting method of steel |
| CN110614351A (en) * | 2019-10-30 | 2019-12-27 | 江苏理工学院 | Continuous casting covering slag for stainless steel and preparation method thereof |
| CN110614351B (en) * | 2019-10-30 | 2021-05-18 | 江苏理工学院 | Continuous casting covering slag for stainless steel and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3081339B2 (en) | 2000-08-28 |
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