JP2000169136A - Synthetic calcium silicate and mold powder for continuous casting of steel using the same - Google Patents
Synthetic calcium silicate and mold powder for continuous casting of steel using the sameInfo
- Publication number
- JP2000169136A JP2000169136A JP10346915A JP34691598A JP2000169136A JP 2000169136 A JP2000169136 A JP 2000169136A JP 10346915 A JP10346915 A JP 10346915A JP 34691598 A JP34691598 A JP 34691598A JP 2000169136 A JP2000169136 A JP 2000169136A
- Authority
- JP
- Japan
- Prior art keywords
- calcium silicate
- synthetic calcium
- mold powder
- weight
- steel
- 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.)
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- Continuous Casting (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
Description
【０００１】本発明は、鋼の連続鋳造用モールドパウダ
ーの基材原料に適した合成ケイ酸カルシウム及び該合成
珪酸カルシウムを用いた鋼の連続鋳造用モールドパウダ
ーに関するものである。[0001] The present invention relates to a synthetic calcium silicate suitable for a base material of a mold powder for continuous casting of steel and a mold powder for continuous casting of steel using the synthetic calcium silicate.
【０００２】[0002]
【従来の技術】鋼の連続鋳造用モールドパウダーは、ポ
ルトランドセメント、合成ケイ酸カルシウム、ワラスト
ナイト、リンスラグ等を基材原料とし、必要に応じてシ
リカ原料を加え、溶融調整剤としてのソーダ灰、ホタル
石、フッ素化合物、アルカリ金属及びアルカリ土類金属
化合物、そして溶融速度調整剤としての炭素粉を添加し
たものが一般的である。2. Description of the Related Art Mold powder for continuous casting of steel is made of portland cement, synthetic calcium silicate, wollastonite, rinse slag, etc. as a base material, silica material is added as required, and soda ash as a melting control agent is used. Fluorite, fluorine compounds, alkali metal and alkaline earth metal compounds, and carbon powder as a melting rate regulator are generally added.
【０００３】モールドパウダーは、モールド内の溶鋼表
面に添加され、種々の役割を果たしながら消費される。
主な役割は、モールドと凝固シェルの潤滑；介在物
の溶解吸収；溶鋼の保温；抜熱速度のコントロール
などである。[0003] Mold powder is added to the surface of molten steel in a mold and is consumed while performing various functions.
Its main roles are lubrication of the mold and solidified shell; dissolution and absorption of inclusions; heat retention of molten steel; control of the heat removal rate.
【０００４】及びは、モールドパウダーの軟化点や
粘度などを調整することが重要であり、化学組成の選定
が肝要である。については、主に炭素粉で調整される
滓化速度、嵩比重、拡がり性などの粉体特性が重要とさ
れている。については、モールドパウダーの結晶化温
度などを調整することが必要で、そのためには化学組成
の選定が肝要となる。[0004] It is important to adjust the softening point and viscosity of the mold powder, and it is important to select a chemical composition. With respect to, powder characteristics such as slagging rate, bulk specific gravity, and spreading property, which are adjusted mainly with carbon powder, are considered important. With regard to (1), it is necessary to adjust the crystallization temperature of the mold powder and the like, and for that purpose, selection of a chemical composition is important.
【０００５】世界における鋼の連続鋳造の技術進歩は目
覚ましいものがあり、更に発展し続けている。また、省
エネルギーからＨＣＲ、ＨＤＲ比率の向上、高速鋳造が
積極的に取り組まれており、モールドパウダーに対する
要求も厳しくなり、モールドパウダーの種類も多種多様
になっている。[0005] The technological advances in continuous casting of steel in the world are remarkable and continue to evolve. In addition, HCR and HDR ratio improvement and high-speed casting have been actively pursued for energy saving, and the demands for mold powder have become stricter, and the types of mold powder have been diversified.
【０００６】[0006]
【発明が解決しようとする課題】従来使用されているモ
ールドパウダーをより具体的に説明すると、基材原料と
してポルトランドセメント、リンスラグ、合成スラグ、
ワラストナイト、ダイカルシウムシリケート等が使用さ
れ、溶融調整剤には、Ｎａ2ＣＯ3、Ｌｉ2ＣＯ3、ＣａＣ
Ｏ3、ＳｒＣＯ3、ＭｎＣＯ3、ＢａＣＯ3などの炭酸塩や
更には、ホタル石、ＭｇＦ2、ＬｉＦ、硼砂、スポジュ
メンなどを使用し、溶融速度調整剤としての炭素質原料
を添加している。The conventional mold powder will be described in more detail. Portland cement, rinse slag, synthetic slag,
Wollastonite, dicalcium silicate, etc. are used, and Na 2 CO 3 , Li 2 CO 3 , CaC
Carbonates such as O 3 , SrCO 3 , MnCO 3 , and BaCO 3, as well as fluorite, MgF 2 , LiF, borax, spodumene, and the like are used, and a carbonaceous raw material as a melting rate regulator is added.
【０００７】なお、モールドパウダーには、基材原料に
合成ケイ酸カルシウムを使用したタイプ（セミプリメル
トタイプ）や、炭素粉を除いたモールドパウダーを予め
溶解し、適切な粒度に粉砕し、その後に炭素粉を添加す
る完全溶融型モールドパウダー（プリメルトタイプ）な
どがあるが、これらのタイプのモールドパウダーが従来
の一般的なスラブ連鋳機からブルーム、ビレット、ラウ
ンド連鋳機までに使用されている。[0007] In addition, a mold powder (semi-pre-melt type) using synthetic calcium silicate as a base material or a mold powder excluding carbon powder is dissolved in advance, pulverized to an appropriate particle size, and then crushed. There is a complete melting type mold powder (pre-melt type) that adds carbon powder to the product. These types of mold powder are used in conventional general slab casters to bloom, billet and round casters. ing.
【０００８】最近の製鉄業界では、地球環境や公害面か
ら、モールドパウダー中のフッ素含有量を低減する方向
に進んでいる。一方、モールドパウダー中のフッ素は連
鋳機設備を腐食させ、連鋳機のメンテナンス費用が莫大
に掛る。浸漬ノズルの溶損もフッ素によって促進され
る。即ち、フッ素不含のモールドパウダーが必要とされ
ている。In recent years, the steelmaking industry has been moving toward reducing the fluorine content in mold powder in view of the global environment and pollution. On the other hand, fluorine in the mold powder corrodes the continuous casting machine equipment, and the maintenance cost of the continuous casting machine is enormous. The erosion of the immersion nozzle is also promoted by fluorine. That is, a fluorine-free mold powder is required.
【０００９】現状のモールドパウダーのフッ素含有量は
少ないものでも３重量％程度である。更に、モールドパ
ウダーには、フッ素含有原料として、ホタル石、Ｎａ
Ｆ、Ｎａ3ＡｌＦ6などが多く使用されているほか、基材
原料例えば合成ケイ酸カルシウムにもフッ素は含まれて
おり、フッ素を含有しないモールドパウダーの品質設計
は困難であった。例えば、特開平２−２７０６３号公報
には、合成ケイ酸カルシウムが開示されているが、Ｆ含
有量が１〜１０重量％であり、この合成ケイ酸カルシウ
ムを基材原料とすれば、フッ素不含のモールドパウダー
は当然のことながら得られない。[0009] The present mold powder has a fluorine content of at least about 3% by weight even if it is small. Further, in the mold powder, fluorite, Na
F, Na 3 AlF 6 and the like are often used, and fluorine is also contained in a base material such as synthetic calcium silicate, and it is difficult to design quality of a fluorine-free mold powder. For example, Japanese Patent Application Laid-Open No. 2-27063 discloses a synthetic calcium silicate, which has an F content of 1 to 10% by weight. Naturally, no mold powder can be obtained.
【００１０】従来のＦを含有しない基材原料は、例えば
ポルトランドセメント、ワラストナイトなどが挙げられ
る。しかし、ポルトランドセメントではＦｅ2Ｏ3含有量
が高く、Ｓも含有している点から溶鋼汚染を引き起こす
問題がある。一方、ワラストナイトでは、Ｆｅ2Ｏ3やＳ
の含有量は低いものの、天然原料のために成分のばらつ
きが大きく、モールドパウダーの製品のばらつきに繋が
り易い欠点を有し、好ましいモールドパウダーが得られ
難い。[0010] Conventional F-free base materials include, for example, Portland cement, wollastonite and the like. However, high Fe 2 O 3 content in Portland cement, S also has a problem of causing molten steel contamination terms containing. On the other hand, in wollastonite, Fe 2 O 3 or S
Although the content of is low, there is a drawback that components are large due to natural raw materials, which easily leads to variations in the product of the mold powder, and it is difficult to obtain a preferable mold powder.
【００１１】一方、特開昭５８−１２５３４９号公報に
は、ＣａＯ：３０〜４５％、ＳｉＯ 2：２０〜４５％、
Ｎａ2Ｏ、Ｋ2Ｏ、Ｌｉ2Ｏのうち１種または２種以上を
３〜２０％、合計Ｃ：３〜６％、適宜Ａｌ2Ｏ3：２〜５
％からなり、かつＣａＯとＳｉＯ2の配合比がＣａＯ／
ＳｉＯ2＝０．６８〜１．２の条件に従うことを特徴と
する連続鋳造用鋳型添加剤が開示されている。即ち、Ｆ
を含有しないモールドパウダーが開示されている。しか
し、Ｆｅ2Ｏ3の含有量やモールドパウダーを得るための
原料が言及されておらず、また、Ａｌ2Ｏ3含有が２〜５
重量％の範囲にあっても良いことが記載されている。更
に、モールドパウダー中のＡｌ2Ｏ3含有量は５重量％以
上なければ均一な溶融を呈さない。また、フラックス成
分にＫ2Ｏを使用しているが、成分蒸発により成分変動
が大きくなるため使用は困難である。また、軟化点が１
０６０℃と低く、自ずからその粘度値も低く、不均一流
入や抜熱が不安定となるために好ましくない。On the other hand, JP-A-58-125349 discloses
Is CaO: 30-45%, SiO Two: 20-45%,
NaTwoO, KTwoO, LiTwoOne or more of O
3-20%, total C: 3-6%, Al as appropriateTwoOThree: 2-5
%, And CaO and SiOTwoIs CaO /
SiOTwo= 0.68 to 1.2
A continuous casting mold additive is disclosed. That is, F
No mold powder is disclosed. Only
And FeTwoOThreeContent and mold powder to obtain
No raw material is mentioned, and AlTwoOThreeContent 2-5
It is stated that it may be in the range of weight%. Change
Al in the mold powderTwoOThreeContent is 5% by weight or less
If not, it does not exhibit uniform melting. In addition, flux
K for a minuteTwoO is used, but component fluctuates due to component evaporation
Is difficult to use because it becomes large. In addition, the softening point is 1
060 ° C, low viscosity value
It is not preferable because heat input and heat removal become unstable.
【００１２】また、特開昭５０−８６４２３号公報に
は、ＣａＯ：１０〜５０％、ＳｉＯ2：２０〜５０％、
Ａｌ2Ｏ3：１〜２０％、Ｆｅ2Ｏ3：０．１〜１０％、Ｎ
ａ2Ｏ：１〜２０％、Ｃ：１〜１５％、Ｋ2Ｏ：０．１〜
１０％、ＭｇＯ：０．１〜５％、適宜Ｂ2Ｏ3：０．１〜
２０％、その他の不純物からなり、粉状を呈することを
特徴とする鋼の連続鋳造用添加剤が開示されている。し
かし、この鋳造用添加剤はＫ2Ｏを使用し、また、鋳片
品質を向上させる点で不十分である。JP-A-50-86423 discloses that CaO: 10 to 50%, SiO 2 : 20 to 50%,
Al 2 O 3 : 1 to 20%, Fe 2 O 3 : 0.1 to 10%, N
a 2 O: 1~20%, C : 1~15%, K 2 O: 0.1~
10%, MgO: 0.1~5%, suitably B 2 O 3: 0.1~
There is disclosed an additive for continuous casting of steel, which is composed of 20% and other impurities and has a powdery shape. However, this casting additive uses K 2 O and is insufficient in improving slab quality.
【００１３】更に、特開平５−２６９５６０号公報に
は、鋼の連続鋳造方法において、ＣａＯ−ＺｒＯ2系原
料を主骨材とするＺｒＯ2−Ｃ系材料を少なくともパウ
ダーラインに配した浸漬ノズルと、ＣａＯ、Ａｌ2Ｏ3及
びＳｉＯ2を主成分とする鋼の連続鋳造用鋳型添加剤で
あって、ＣａＯ／ＳｉＯ2重量比が１．１〜１．８で、
ＣａＯ／Ｆ重量比が９〜４０である鋳型添加剤を併用す
ることを特徴とする鋼の連続鋳造方法が開示されてい
る。しかし、この方法は効果が小さく、安定した鋳造も
得られ難い。また、この場合、モールドパウダー中のＦ
は必須成分であり、当然のことながら本発明が目的とす
る効果も充分に発揮できない。Furthermore, Japanese Patent Application Laid-Open No. 5-269560 discloses a continuous casting method for steel, comprising a dipping nozzle having a ZrO 2 -C-based material having a CaO-ZrO 2 -based raw material as a main aggregate at least in a powder line. , CaO, a Al 2 O 3 and the continuous casting mold additive steel of SiO 2 as a main component, at CaO / SiO 2 weight ratio of 1.1 to 1.8,
A continuous casting method for steel characterized by using a mold additive having a CaO / F weight ratio of 9 to 40 is disclosed. However, this method has a small effect, and it is difficult to obtain a stable casting. Also, in this case, F in the mold powder
Is an essential component, and of course, the effect aimed at by the present invention cannot be sufficiently exhibited.
【００１４】また、特公昭５６−２９７３３号公報に
は、弗素化合物を全く含まない精錬剤であって、その成
分組成が、ＣａＯ２０〜４５％、ＳｉＯ2２０〜４５
％、Ｂ2Ｏ 3０．５〜５％、Ｎａ2Ｏ＋Ｋ2Ｏ＋Ｌｉ2Ｏ３
〜１５％で、かつＣａＯ／ＳｉＯ２が０．８〜１．２の
範囲に調整された鋳片連続鋳造用精錬剤が開示されてい
る。In Japanese Patent Publication No. 56-29733,
Is a refining agent containing no fluorine compounds,
The composition is 20-45% CaO, SiOTwo20-45
%, BTwoO Three0.5-5%, NaTwoO + KTwoO + LiTwoO3
１５15% and CaO / SiO 2 of 0.8-1.2
Refining agents for continuous casting of slabs adjusted to a range are disclosed.
You.
【００１５】更に、特開昭５１−６７２２７号公報に
は、基材、融剤、滓化調整剤から構成され、溶融状態で
の化学組成が重量％で下記の範囲にある鋼の鋳造用フラ
ックス：ＳｉＯ2３０〜６０重量％；ＣａＯ２〜４０重
量％；Ａｌ2Ｏ3１〜２８重量％；アルカリ金属酸化物１
〜１５重量％；Ｂ2Ｏ3７〜１８重量％；ＭｎＯ５〜１５
重量％；ＦｅＯ１〜５重量％；Ｃ０〜１７重量％が開示
されている。また、特開昭５１−９３７２８号公報に
は、ＳｉＯ2−ＣａＯ−Ａｌ2Ｏ3三元系基材５０〜８０
重量部、アルカリ金属化合物１〜１５重量部、炭酸マン
ガン、酸化マンガン、鉄マン、酸化鉄、イルメナイトの
うち１種または２種以上１〜１５重量部、更に滓化調整
剤としての炭素質物質を５重量部以下からなり、しかも
弗化物を含有しない鋼の連続鋳造用フラックスが開示さ
れている。しかし、こられのフラックスはＦｅ2Ｏ3含有
率が高く、鋳片品質の劣化が著しい。Further, Japanese Patent Application Laid-Open No. 51-67227 discloses a flux for steel casting comprising a base material, a flux, and a slag control agent, and having a chemical composition in a molten state in the following range by weight%. : SiO 2 30 to 60% by weight; CaO2～40 wt%; Al 2 O 3 1 to 28 wt%; alkali metal oxides 1
15 wt%; B 2 O 3 7~18 wt%; MnO5~15
1% to 5% by weight of FeO; 0 to 17% by weight of C0. Further, in JP-A-51-93728, SiO 2 -CaO-Al 2 O 3 ternary system base material 50 to 80
Parts by weight, 1 to 15 parts by weight of an alkali metal compound, 1 to 15 parts by weight of one or more of manganese carbonate, manganese oxide, iron man, iron oxide, and ilmenite, and a carbonaceous substance as a slag control agent. A continuous casting flux of steel containing less than 5 parts by weight and containing no fluoride is disclosed. However, these fluxes have a high Fe 2 O 3 content, and the quality of slabs is remarkably deteriorated.
【００１６】また、特開昭５１−１３２１１３号公報に
は、ＣａＯ：１０〜５０％、ＳｉＯ 2：２０〜５０％、
Ａｌ2Ｏ3：１〜２０％、Ｆｅ2Ｏ3：０．１〜１０％、Ｎ
ａ2Ｏ：１〜２０％、Ｃ：１〜１５％、Ｋ2Ｏ：０．１〜
１０％、ＭｇＯ：０．１〜５％、適宜Ｆ：０．１〜１０
％、適宜Ｂ2Ｏ3：０．１〜２０％、無機質及び有機質粘
結剤：０．５〜１０％、及び少量の不純物からなり、径
０．１〜５ｍｍの粒形を呈することを特徴とする鋼の連
続鋳造用添加剤が開示されている。しかし、この添加剤
は高粘度特性とは異なり、安定した鋳片品質が得られな
い。Further, Japanese Patent Application Laid-Open No. 51-132113 discloses
Is CaO: 10 to 50%, SiO Two: 20-50%
AlTwoOThree: 1 to 20%, FeTwoOThree: 0.1 to 10%, N
aTwoO: 1 to 20%, C: 1 to 15%, KTwoO: 0.1-
10%, MgO: 0.1 to 5%, suitably F: 0.1 to 10
%, If appropriate BTwoOThree: 0.1-20%, inorganic and organic viscous
Binder: 0.5-10%, consisting of small amount of impurities, diameter
A steel chain having a grain shape of 0.1 to 5 mm.
A continuous casting additive is disclosed. But this additive
Does not provide stable slab quality unlike high viscosity characteristics.
No.
【００１７】従って、本発明の目的は、鋼の連続鋳造用
モールドパウダーの基材原料として好適なフッ素不含の
合成ケイ酸カルシウム、並びに鋳片品質を著しく向上で
き、鋳片の無手入れ化を達成でき、且つブレークアウト
の発生しない安定した鋳造を可能とする該合成ケイ酸カ
ルシウムを使用した適正な粘度と結晶化温度を有する鋼
の連続鋳造用モールドパウダーを提供することにある。Accordingly, an object of the present invention is to provide a fluorine-free synthetic calcium silicate suitable as a base material for a mold powder for continuous casting of steel, and to significantly improve the quality of cast slabs and to eliminate the need for maintenance of cast slabs. An object of the present invention is to provide a mold powder for continuous casting of steel having an appropriate viscosity and crystallization temperature using the synthetic calcium silicate which can be achieved and enables stable casting without occurrence of breakout.
【００１８】[0018]
【課題を解決するための手段】即ち、本発明の合成ケイ
酸カルシウムは、必須成分としてＣａＯ及びＳｉＯ2を
含有してなり、ＣａＯ／ＳｉＯ2重量比が０．３０〜
１．０５の範囲内にあり、Ｆｅ2Ｏ3含有量が不可避不純
物として３重量％以下であり、且つフッ素が実質上不在
である溶融水砕物よりなることを特徴とする。That is, the synthetic calcium silicate of the present invention contains CaO and SiO 2 as essential components, and has a CaO / SiO 2 weight ratio of 0.30 to 0.30.
It is characterized by being in the range of 1.05, being composed of a crushed molten material in which the content of Fe 2 O 3 is 3% by weight or less as an unavoidable impurity and fluorine is substantially absent.
【００１９】更に、本発明の鋼の連続鋳造用モールドパ
ウダーは、上記合成ケイ酸カルシウムを基材原料として
少なくとも４０重量％含有してなることを特徴とする。Further, the mold powder for continuous casting of steel of the present invention is characterized in that it contains at least 40% by weight of the above-mentioned synthetic calcium silicate as a base material.
【００２０】[0020]
【発明の実施の形態】鋼の連続鋳造用モールドパウダー
に基材原料として使用される本発明の合成ケイ酸カルシ
ウムは、フッ素不含であるため、該合成ケイ酸カルシウ
ムを基材原料として使用したモールドパウダーのフッ素
含有量を実質上ゼロに設定することができる。また、該
合成ケイ酸カルシウムのＣａＯ／ＳｉＯ2重量比は０．
３０〜１．０５と比較的低い範囲内にあり、低ＣａＯ／
ＳｉＯ2重量比を有するモールドパウダーを設計し易
く、モールドパウダーの粘度を高く、且つ結晶化温度を
低く調整できる特徴がある。従って、場合によっては、
モールドパウダーの原料としてＳｉＯ2原料も活用で
き、嵩比重や安息角などの粉体特性も調整できる。BEST MODE FOR CARRYING OUT THE INVENTION The synthetic calcium silicate of the present invention, which is used as a base material in a mold powder for continuous casting of steel, is fluorine-free. The fluorine content of the mold powder can be set to substantially zero. The CaO / SiO 2 weight ratio of the synthetic calcium silicate is 0.1.
It is in a relatively low range of 30 to 1.05, and has a low CaO /
It is easy to design a mold powder having a weight ratio of SiO 2, so that the viscosity of the mold powder is high and the crystallization temperature can be adjusted to a low level. Therefore, in some cases,
As a raw material of the mold powder, an SiO 2 raw material can be used, and powder characteristics such as bulk specific gravity and angle of repose can be adjusted.
【００２１】まず、本発明の合成ケイ酸カルシウムにつ
いて詳述する。本発明の合成ケイ酸カルシウムは、必須
成分としてＣａＯ及びＳｉＯ2を含有してなり、ＣａＯ
／ＳｉＯ2重量比は０．３〜１．０５の範囲内にある。
ＣａＯ／ＳｉＯ2重量比がこの範囲外であると、フッ素
が実質上不在であるために後述するように原料配合物が
溶融し難くなり、合成ケイ酸カルシウムを製造すること
が困難となるために好ましくない。First, the synthetic calcium silicate of the present invention will be described in detail. The synthetic calcium silicate of the present invention contains CaO and SiO 2 as essential components.
The / SiO 2 weight ratio is in the range of 0.3 to 1.05.
If the CaO / SiO 2 weight ratio is out of this range, fluorine is substantially absent, so that the raw material composition is difficult to melt as described later, and it becomes difficult to produce synthetic calcium silicate. Not preferred.
【００２２】また、本発明の合成ケイ酸カルシウムにお
いて、不可避不純物であるＦｅ2Ｏ3の含有量は３重量％
以下が好ましい。Ｆｅ2Ｏ3含有量が３重量％以下であれ
ば、モールドパウダーの基材原料として該合成ケイ酸カ
ルシウムを配合した時に、モールドパウダーのＦｅ2Ｏ3
含有量を少なくすることができ、溶鋼中のＡｌとの反応
も抑制されて鋼の汚染が抑制されたり、モールドパウダ
ースラグの組成変動も少なくなり安定した鋳造が可能と
なる。In the synthetic calcium silicate of the present invention, the content of Fe 2 O 3 as an unavoidable impurity is 3% by weight.
The following is preferred. When the Fe 2 O 3 content is 3% by weight or less, when the synthetic calcium silicate is blended as a base material of the mold powder, the Fe 2 O 3 of the mold powder is mixed.
The content can be reduced, the reaction with Al in the molten steel is also suppressed, the contamination of the steel is suppressed, and the composition fluctuation of the mold powder slag is also reduced, and stable casting is possible.
【００２３】本発明の合成ケイ酸カルシウムにおいて、
フッ素は、実質上不在である。合成ケイ酸カルシウム中
にフッ素が存在すると、モールドパウダーのフッ素を実
質上不在とすることができないために好ましくない。In the synthetic calcium silicate of the present invention,
Fluorine is substantially absent. The presence of fluorine in the synthetic calcium silicate is not preferable because fluorine in the mold powder cannot be substantially absent.
【００２４】なお、本発明の合成ケイ酸カルシウムにお
いては、原料鉱物等に由来する不可避不純物や製造時の
不可避不純物等は許容できる。In the synthetic calcium silicate of the present invention, unavoidable impurities derived from raw material minerals and the like and unavoidable impurities at the time of production are acceptable.
【００２５】本発明の合成ケイ酸カルシウムは、原料と
してＣａＣＯ3、Ｃａ（ＯＨ）2、ドロマイト、ケイ砂、
ケイ石、粘土、ボーキサイト、シャモット、ガラス屑、
ソーダ灰、炭酸リチウム、ワラステナイト、セメント及
びコークス粉等を使用し、所定の化学成分となるように
混合し、電気炉などの加熱炉で１３５０℃以上の高温下
で加熱溶融し、水砕急冷し、１００℃以上の温度で乾燥
し、粉砕機で１００メッシュ以下に粉砕することにより
容易に得られる。The synthetic calcium silicate of the present invention is obtained by using, as raw materials, CaCO 3 , Ca (OH) 2 , dolomite, silica sand,
Silica stone, clay, bauxite, chamotte, glass shavings,
Using soda ash, lithium carbonate, wollastenite, cement, coke powder, etc., mix them into the specified chemical components, heat and melt at a high temperature of 1350 ° C or more in a heating furnace such as an electric furnace, and granulate and quench. Then, it is easily obtained by drying at a temperature of 100 ° C. or more and pulverizing it to 100 mesh or less with a pulverizer.
【００２６】なお、合成ケイ酸カルシウムの製造に際し
て、コークス粉は、溶融物中のＦｅ 2Ｏ3を還元除去し、
ガラス粉等の低融点物は溶融時間の短縮を目的に使用す
るものである。In the production of synthetic calcium silicate,
And the coke powder is TwoOThreeTo reduce and remove
Low melting point materials such as glass powder are used to shorten the melting time.
Things.
【００２７】上述のような本発明の合成ケイ酸カルシウ
ムは、８５〜１００％の範囲で非晶質の溶融水砕物であ
るため、成分が極めて均一であり、遊離のＣａＯ、２Ｃ
ａＯ・ＳｉＯ2、３ＣａＯ・ＳｉＯ2等のような水和性鉱
物を含有しないため、水とバインダーを使用して押出造
粒、撹拌造粒、スプレー造粒などにより造粒される顆粒
状モールドパウダーの製造にも適している。Since the above-mentioned synthetic calcium silicate of the present invention is an amorphous molten granulated product in the range of 85 to 100%, its components are extremely uniform and free CaO, 2C
Since aO-· SiO 2, it does not contain a hydrated mineral, such as 2 such 3CaO · SiO, using water and a binder extrusion granulation, agitation granulation, granular molding powder which is granulated by a spray granulation Also suitable for the manufacture of
【００２８】なお、本発明の合成ケイ酸カルシウムに
は、Ａｌ2Ｏ3を１０重量％以下の量で含有していても良
い。Ａｌ2Ｏ3の含有量が１０重量％以下であれば、モー
ルドパウダー中のＡｌ2Ｏ3の含有量を設定値に調整し易
くなるために好ましい。なお、合成ケイ酸カルシウムの
製造に際して、Ａｌ2Ｏ3含有量が１０重量％を超ると原
料配合物の融点が上昇し、合成ケイ酸カルシウムを製造
することが難しくなるために好ましくない。The synthetic calcium silicate of the present invention may contain Al 2 O 3 in an amount of 10% by weight or less. If it is less than 10 wt% content of Al 2 O 3, preferably in order to easily adjust the content of Al 2 O 3 in the mold powder to the set value. In the production of synthetic calcium silicate, if the content of Al 2 O 3 exceeds 10% by weight, the melting point of the raw material mixture increases, which makes it difficult to produce synthetic calcium silicate.
【００２９】また、本発明の合成ケイ酸カルシウムに
は、Ｎａ2Ｏ、Ｌｉ2Ｏ、ＭｇＯ、Ｂ2Ｏ3、ＢａＯ、Ｓｒ
Ｏ、ＭｎＯ等のフラックス成分を添加し、製造上の作業
性を向上させることもできる。しかし、フラックス成分
は高温下で蒸発し易く、成分の変動や炉体の損傷を促進
するために１５重量％以下の量で使用することが好まし
い。The synthetic calcium silicate of the present invention includes Na 2 O, Li 2 O, MgO, B 2 O 3 , BaO, Sr
By adding flux components such as O and MnO, workability in production can be improved. However, the flux component is easily evaporated at a high temperature, and is preferably used in an amount of 15% by weight or less in order to promote variation of the component and damage to the furnace body.
【００３０】更に、モールドパウダー中にＺｒＯ2を添
加してモールドパウダーの結晶化温度を調整する場合も
あり、この場合においては、予め本発明の合成ケイ酸カ
ルシウムにＺｒＯ2を添加しておくことも可能である。
この場合、５重量％以下が好ましい。ＺｒＯ2の配合量
が５重量％を超ると、合成ケイ酸カルシウムの融点が上
昇し、成分が不均一になったり、非晶質量が８５％未満
となるために好ましくなく、ＺｒＯ2の量は３重量％以
下がより好ましい。In some cases, ZrO 2 is added to the mold powder to adjust the crystallization temperature of the mold powder. In this case, it is necessary to add ZrO 2 to the synthetic calcium silicate of the present invention in advance. Is also possible.
In this case, 5% by weight or less is preferable. And the amount of ZrO 2 is Choru 5 wt%, the melting point of the synthetic calcium silicate is increased, components may become uneven, not preferable for amorphous volume is less than 85%, the amount of ZrO 2 Is more preferably 3% by weight or less.
【００３１】次に、本発明の合成ケイ酸カルシウムを基
材原料として使用したモールドパウダーの一例を示す： 基材原料：本発明の合成ケイ酸カルシウム ＳｉＯ2原料：パーライト、フライアッシュ、ケイ
砂、ガラス粉、ケイ藻土、スポシュメン、ソーダ長石な
ど フラックス原料：Ｎａ2ＣＯ3、Ｌｉ2ＣＯ3、ＢａＣＯ
3、ＭｎＣＯ3、ＳｒＣＯ3、ＭｇＯ、Ａｌ2Ｏ3など 炭素質原料：カーボンブラック、コークス粉、天然黒
鉛、膨張黒鉛。Next, an example of a mold powder using the synthetic calcium silicate of the present invention as a base material is shown below: Base material: synthetic calcium silicate of the present invention SiO 2 material: pearlite, fly ash, silica sand, Glass powder, diatomaceous earth, sposhmen, soda feldspar, etc. Flux raw materials: Na 2 CO 3 , Li 2 CO 3 , BaCO
3 , MnCO 3 , SrCO 3 , MgO, Al 2 O 3, etc. Carbonaceous materials: carbon black, coke powder, natural graphite, expanded graphite.
【００３２】また、モールドパウダーは鋳造条件や鋼種
に応じてモールドパウダーの軟化点、粘度、結晶化温
度、溶融速度などの溶融特性を調整する必要がある。In addition, it is necessary to adjust the melting characteristics of the mold powder, such as the softening point, viscosity, crystallization temperature, and melting rate, according to the casting conditions and the type of steel.
【００３３】本発明の鋼の連続鋳造用モールドパウダー
の化学組成は以下の通りが好ましい： ＣａＯ：２０〜５５重量％、ＳｉＯ2：２０〜５５重量
％、Ａｌ2Ｏ3：５〜３０重量％、Ｆｅ2Ｏ3：０．１〜
３．０重量％、ＭｇＯ：０〜１０重量％、Ｎａ2Ｏ＋Ｋ2
Ｏ＋Ｌｉ2Ｏ：０．１〜２５重量％、Ｂ2Ｏ3：０〜１０
重量％、ＢａＯ：０〜１０重量％、ＺｒＯ2：０〜５重
量％、ＳｒＯ：０〜５重量％、Ｃ：０〜１０重量％、Ｃ
ａＯ／ＳｉＯ2重量比：０．３〜１．０The chemical composition of the continuous casting mold powder of the steel of the present invention are as follows are preferred: CaO: 20 to 55 wt%, SiO 2: 20 to 55 wt%, Al 2 O 3: 5~30 wt% , Fe 2 O 3 : 0.1 to
3.0 wt%, MgO: 0 wt%, Na 2 O + K 2
O + Li 2 O: 0.1~25 wt%, B 2 O 3: 0~10
Wt%, BaO: 0 wt%, ZrO 2: 0~5 wt%, SrO: 0 to 5 wt%, C: 0 wt%, C
aO / SiO 2 weight ratio: 0.3 to 1.0
【００３４】上述の化学成分をもつ本発明の鋼の連続鋳
造用モールドパウダーは、本発明の合成ケイ酸カルシウ
ムを４０重量％以上、ＳｉＯ2原料を０〜３０重量％、
フラックス原料を０〜３０重量％、炭素質原料を０〜１
０重量％配合することにより調製することができる。な
お、合成ケイ酸カルシウムの配合量の上限は、９５重量
％である。合成ケイ酸カルシウムの配合量が９５重量％
を超ると、溶融性、滓化性が悪化し、良好な特性が得ら
れないために好ましくない。The mold powder for continuous casting of the steel of the present invention having the above-mentioned chemical components comprises at least 40% by weight of the synthetic calcium silicate of the present invention and 0 to 30% by weight of the SiO 2 raw material.
0 to 30% by weight of flux raw material and 0 to 1 of carbonaceous raw material
It can be prepared by mixing 0% by weight. The upper limit of the amount of the synthetic calcium silicate is 95% by weight. 95% by weight of synthetic calcium silicate
If it exceeds 3, the melting property and the slagging property are deteriorated, and it is not preferable because good characteristics cannot be obtained.
【００３５】ここで、本発明の合成ケイ酸カルシウムの
配合量が４０重量％未満であると、モールドパウダーの
プリメルト比率が低下し、成分の均一性が損なわれるた
めに好ましくない。また、基材原料として、本発明の合
成ケイ酸カルシウムの他に石灰石、ポルトランドセメン
ト等を併用することもできる。この場合、それぞれの添
加量は２５重量％以下が好ましい。これらの添加量が２
５重量％を超ると、成分の均一性が損なわれる他、炭酸
ガス量を増加し、モールド内での溶融性状が劣化し、ス
ラグベアーの生成が起るために好ましくない。Here, if the amount of the synthetic calcium silicate of the present invention is less than 40% by weight, the premelt ratio of the mold powder is decreased, and the uniformity of the components is unfavorably deteriorated. Limestone, Portland cement and the like can also be used as a base material in addition to the synthetic calcium silicate of the present invention. In this case, the amount of each addition is preferably 25% by weight or less. When the amount of these additives is 2
If the content exceeds 5% by weight, the uniformity of the components is impaired, the amount of carbon dioxide gas is increased, the melting property in the mold is deteriorated, and the generation of slag bear is not preferable.
【００３６】ＳｉＯ2原料の配合量は０〜３０重量％の
範囲が好ましい。ＳｉＯ2原料の添加量が３０重量％を
超ると、基材原料である合成ケイ酸カルシウムのＣａＯ
／ＳｉＯ2重量比が比較的低いため、低ＣａＯ／ＳｉＯ2
重量比のモールドパウダーが得られなくなるために好ま
しくなく、また、かさ比重が低下して粉塵発生量が増加
して作業環境が悪化するために好ましくない。The amount of the SiO 2 raw material is preferably in the range of 0 to 30% by weight. If the added amount of the SiO 2 raw material exceeds 30% by weight, the CaO of the synthetic calcium silicate as the base material is increased.
/ SiO 2 weight ratio is relatively low, so low CaO / SiO 2
It is not preferable because mold powder having a weight ratio cannot be obtained, and it is not preferable because the bulk specific gravity decreases and the amount of dust generated increases to deteriorate the working environment.
【００３７】フラックス原料は溶融特性を調整するため
に重要であるが、不在であってもかまわない。フラック
ス原料を配合しない場合、モールドパウダーのＣａＯ／
ＳｉＯ2重量比は１．０以下でなければ融点が高すぎる
ために好ましくない。フラックス原料の配合量の上限は
３０重量％である。３０重量％を超ると、融点が著しく
低下し、スラグベアーが生成したり、粘度が著しく低下
するために好ましくない。The flux raw material is important for adjusting the melting properties, but may be absent. When no flux material is blended, the mold powder CaO /
Unless the weight ratio of SiO 2 is 1.0 or less, the melting point is too high, which is not preferable. The upper limit of the amount of the flux material is 30% by weight. If it exceeds 30% by weight, the melting point is remarkably lowered, and slag bears are formed and the viscosity is remarkably lowered.
【００３８】炭素質原料はモールドパウダーの溶融速度
を調整するために添加させることができる。その添加量
は１０重量％以下の範囲が好ましい。炭素質原料の添加
量が１０重量％を超ると滓化速度が著しく遅くなるため
に好ましくない。なお、炭素質原料が不在の場合には、
金属を添加する必要がある。金属の添加量は５重量％以
下が好ましい。ここで、金属としてはＳｉ、Ａｌ、Ｍ
ｇ、Ｃａ等の金属を単体もしくは合金として使用するこ
とができる。The carbonaceous raw material can be added to adjust the melting speed of the mold powder. The addition amount is preferably in the range of 10% by weight or less. If the amount of the carbonaceous raw material exceeds 10% by weight, the slagging rate is undesirably reduced. In addition, when the carbonaceous raw material is absent,
It is necessary to add a metal. The amount of metal added is preferably 5% by weight or less. Here, as the metal, Si, Al, M
Metals such as g and Ca can be used alone or as an alloy.
【００３９】本発明のモールドパウダーの粘度は、１３
００℃で４ポイズ以上が好ましく、より好ましくは４〜
４０ポイズの範囲内である。モールドパウダーの粘度が
４ポイズ未満であると、モールドパウダーの不均一流入
や抜熱が不安定になるために好ましくない。一方、４０
ポイズを超ると、軟化点や凝固温度が高くなりすぎ、ス
ラグベアーの生成が顕著になるために好ましくない。The viscosity of the mold powder of the present invention is 13
4 poise or more at 00 ° C. is preferable, and 4 to 4 poise is more preferable.
It is within the range of 40 poise. If the viscosity of the mold powder is less than 4 poise, it is not preferable because the inflow of the mold powder and the heat removal become unstable. On the other hand, 40
Exceeding the poise is not preferable because the softening point and the solidification temperature become too high, and the generation of slag bear becomes remarkable.
【００４０】更に、本発明のモールドパウダーの軟化点
は、１１００℃以上が好ましく、より好ましくは１１０
０〜１２９５℃である。モールドパウダーの軟化点が１
１００℃未満となると、粘度も自ずから低下するために
好ましくなく、逆に、１２９５℃を超ると凝固温度が１
３００℃を超るためにモールドパウダーとして適さな
い。Further, the softening point of the mold powder of the present invention is preferably 1100 ° C. or higher, more preferably 110 ° C.
0-1295 ° C. The softening point of mold powder is 1
If the temperature is lower than 100 ° C., the viscosity is naturally lowered, which is not preferable.
Since it exceeds 300 ° C, it is not suitable as a mold powder.
【００４１】また、本発明のモールドパウダーの凝固温
度は、１１００℃以上が好ましい。１１００℃を下回る
と、スラグフィルムの厚みが不均一になり、抜熱が安定
しないために好ましくない。The solidification temperature of the mold powder of the present invention is preferably 1100 ° C. or higher. If the temperature is lower than 1100 ° C., the thickness of the slag film becomes non-uniform, and the heat removal is not stable.
【００４２】なお、本発明の合成ケイ酸カルシウムを基
材原料として使用したモールドパウダーは、各原料を配
合した後、ミキサーで混合することによって粉末品とし
て得ることができる。また、原料混合物に水とバインダ
ーを添加して造粒したり、スラリー状にした後にスプレ
ー造粒して顆粒品とすることもできる。The mold powder using the synthetic calcium silicate of the present invention as a base material can be obtained as a powdered product by mixing the respective materials and mixing them with a mixer. Further, the raw material mixture may be granulated by adding water and a binder, or may be formed into a slurry by forming into a slurry, followed by spray granulation.
【００４３】[0043]
【実施例】以下に実施例を挙げて本発明を更に説明す
る。 実施例 合成ケイ酸カルシウムの調製 表１の化学組成となるように各原料を配合混合し、電気
炉中で連続して１５００〜１７００℃に加熱して溶解
し、得られた溶融物を水砕急冷して得られた粉砕品を１
５０℃で加熱乾燥し、最後にボールミルで１００メッシ
ュ以下に粉砕して合成ケイ酸カルシウムを得た。The present invention will be further described with reference to the following examples. Example Preparation of Synthetic Calcium Silicate Each raw material was mixed and mixed so as to have the chemical composition shown in Table 1, and continuously heated and melted at 1500 to 1700 ° C. in an electric furnace, and the obtained melt was granulated with water. 1 crushed product obtained by quenching
The resultant was dried by heating at 50 ° C., and finally pulverized with a ball mill to 100 mesh or less to obtain a synthetic calcium silicate.
【００４４】[0044]
【表１】 [Table 1]
【００４５】モールドパウダーの調製 次に、表１に記載する合成ケイ酸カルシウムを基材原料
として表２に記載する配合割合にて混合することによ
り、モールドパウダーを得た。なお、得られたモールド
パウダーの組成及び諸特性を表２に併記する。Preparation of Mold Powder Next, a mold powder was obtained by mixing the synthetic calcium silicate shown in Table 1 as a base material at the mixing ratio shown in Table 2. Table 2 also shows the composition and characteristics of the obtained mold powder.
【００４６】[0046]
【表２】 [Table 2]
【００４７】[0047]
【表３】 [Table 3]
【００４８】表２において、潤滑安定度は、モールド銅
板温度の安定度とブレークアウト発生状況を観察したも
のであり、○は安定、ブレークアウト警報なし、△はや
や安定、ブレークアウト警報発生３回以内、×は不安
定、ブレークアウト警報発生５回以上を示す。また、品
質安定性は、表面割れ発生状況を観察したものであり、
○は発生なし、△は１回生成、×は２回以上生成を示
す。更に、メンテナンスは２次冷却帯のスプレーの当た
る箇所に鉄板を設置し、その腐食状況を観察したもので
あり、○は腐食無し、×は腐食ありを示す。In Table 2, the lubrication stability is obtained by observing the stability of the mold copper plate temperature and the occurrence of a breakout. O indicates stable, no breakout alarm occurs, Δ indicates slightly stable, and breakout alarm occurs three times. Within, × indicates unstable, breakout alarm has occurred 5 or more times. In addition, the quality stability is obtained by observing the occurrence of surface cracks.
O indicates no occurrence, Δ indicates generation once, and X indicates generation twice or more. Further, the maintenance was performed by installing an iron plate at a location where the spray was applied to the secondary cooling zone and observing the corrosion state. O indicates no corrosion and X indicates corrosion.
【００４９】[0049]
【発明の効果】本発明によれば、モールドパウダーのフ
ッ素含有量を低減するために基材原料としてフッ素を実
質上含有しない特定の合成ケイ酸カルシウムを使用し、
且つモールドパウダーの特性値を特定することで、安定
操業と鋳片表面割れを抑制できる鋼の連続鋳造用モール
ドパウダーを提供することができる。According to the present invention, a specific synthetic calcium silicate containing substantially no fluorine is used as a base material in order to reduce the fluorine content of the mold powder,
In addition, by specifying the characteristic value of the mold powder, it is possible to provide a mold powder for continuous casting of steel capable of suppressing a slab surface crack and a stable operation.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4G073 BA03 BA04 BA10 BA11 BA12 BA13 BA21 BA32 BA36 BA56 BA57 BA63 BD03 BD21 CC08 CE01 UB41 ──────────────────────────────────────────────────続 き Continued on front page F-term (reference) 4G073 BA03 BA04 BA10 BA11 BA12 BA13 BA21 BA32 BA36 BA56 BA57 BA63 BD03 BD21 CC08 CE01 UB41
Claims (6)
有してなり、ＣａＯ／ＳｉＯ2重量比が０．３０〜１．
０５の範囲内にあり、Ｆｅ2Ｏ3含有量が不可避不純物と
して３重量％以下であり、且つフッ素が実質上不在であ
る溶融水砕物よりなることを特徴とする合成ケイ酸カル
シウム。1. It contains CaO and SiO 2 as essential components, and has a CaO / SiO 2 weight ratio of 0.30 to 1.
In the range of 05, Fe 2 O 3 content is 3 wt% or less as inevitable impurities, and fluorine synthetic calcium silicate characterized by comprising melting water grind is substantially absent.
てなる、請求項１記載の合成ケイ酸カルシウム。 2. The synthetic calcium silicate according to claim 1, comprising Al 2 O 3 in an amount of not more than 10% by weight.
ａＯ、ＳｒＯ及びＭｎＯからなる群から選択される１種
または２種以上の成分を１５重量％以下の量で含有して
なる、請求項１または２記載の合成ケイ酸カルシウム。3. Na 2 O, Li 2 O, MgO, B 2 O 3 , B
The synthetic calcium silicate according to claim 1 or 2, comprising one or more components selected from the group consisting of aO, SrO and MnO in an amount of 15% by weight or less.
なる、請求項１ないし３のいずれか１項記載の合成ケイ
酸カルシウム。4. The synthetic calcium silicate according to claim 1, wherein ZrO 2 is contained in an amount of 5% by weight or less.
％である、請求項１ないし４のいずれか１項記載の合成
ケイ酸カルシウム。5. The synthetic calcium silicate according to claim 1, wherein the content of the amorphous component is 85 to 100% by weight.
合成ケイ酸カルシウムを基材原料として少なくとも４０
重量％含有してなることを特徴とする鋼の連続鋳造用モ
ールドパウダー。6. The synthetic calcium silicate according to claim 1, wherein said base material is at least 40%.
A mold powder for continuous casting of steel, characterized in that the powder contains 0.1% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34691598A JP4727773B2 (en) | 1998-12-07 | 1998-12-07 | Mold powder for continuous casting of steel using synthetic calcium silicate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34691598A JP4727773B2 (en) | 1998-12-07 | 1998-12-07 | Mold powder for continuous casting of steel using synthetic calcium silicate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000169136A true JP2000169136A (en) | 2000-06-20 |
| JP4727773B2 JP4727773B2 (en) | 2011-07-20 |
Family
ID=18386680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34691598A Expired - Fee Related JP4727773B2 (en) | 1998-12-07 | 1998-12-07 | Mold powder for continuous casting of steel using synthetic calcium silicate |
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| Country | Link |
|---|---|
| JP (1) | JP4727773B2 (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002096146A (en) * | 2000-09-20 | 2002-04-02 | Sumitomo Metal Ind Ltd | Mold powder for continuous casting |
| 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 |
| JP2006110568A (en) * | 2004-10-12 | 2006-04-27 | Sanyo Special Steel Co Ltd | Mold powder for continuously casting high aluminum steel and method for continuously casting high aluminum steel |
| JP2006247712A (en) * | 2005-03-11 | 2006-09-21 | Jfe Steel Kk | Mold powder for continuous casting of steel |
| JP2009541060A (en) * | 2006-06-22 | 2009-11-26 | ポスコ | Mold flux and continuous casting method using the same |
| JP2010036193A (en) * | 2008-07-31 | 2010-02-18 | Nippon Steel & Sumikin Metal Products Co Ltd | Powder for continuously casting steel |
| CN102151812A (en) * | 2010-02-11 | 2011-08-17 | 宝山钢铁股份有限公司 | Freon-free environment-friendly continuous casting slag |
| CN103317111A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Fluoride-free mold powder for low-carbon steel |
| WO2014114123A1 (en) | 2013-01-25 | 2014-07-31 | 宝山钢铁股份有限公司 | Fluoride-free continuous casting mold flux for ultralow carbon steel |
| CN105642851A (en) * | 2016-03-09 | 2016-06-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for large slab medium-carbon steel and preparation method thereof |
| JP2020192536A (en) * | 2019-05-24 | 2020-12-03 | 日本製鉄株式会社 | Mold powder for continuous casting |
| CN114905013A (en) * | 2022-05-16 | 2022-08-16 | 江阴兴澄特种钢铁有限公司 | Crystallizer casting powder suitable for casting round billets with diameter of 1000mm and above and preparation method thereof |
| JP7469615B2 (en) | 2020-03-16 | 2024-04-17 | 品川リフラクトリーズ株式会社 | Manufacturing method of mold powder and sintering raw material |
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| JP5471149B2 (en) * | 2009-08-12 | 2014-04-16 | 新日鐵住金株式会社 | Mold powder for continuous casting and steel continuous casting method using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5086423A (en) * | 1973-12-03 | 1975-07-11 | ||
| JPS5162140A (en) * | 1974-11-28 | 1976-05-29 | Shinagawa Refractories Co | |
| JPS51132113A (en) * | 1973-12-03 | 1976-11-17 | Sutoruberugu Gmbh | Additions for continuous steel casting |
| JPS58125349A (en) * | 1982-01-21 | 1983-07-26 | Nippon Kokan Kk <Nkk> | Mold additive for continuous casting |
-
1998
- 1998-12-07 JP JP34691598A patent/JP4727773B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5086423A (en) * | 1973-12-03 | 1975-07-11 | ||
| JPS51132113A (en) * | 1973-12-03 | 1976-11-17 | Sutoruberugu Gmbh | Additions for continuous steel casting |
| JPS5162140A (en) * | 1974-11-28 | 1976-05-29 | Shinagawa Refractories Co | |
| JPS58125349A (en) * | 1982-01-21 | 1983-07-26 | Nippon Kokan Kk <Nkk> | Mold additive for continuous casting |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002096146A (en) * | 2000-09-20 | 2002-04-02 | Sumitomo Metal Ind Ltd | Mold powder for continuous casting |
| 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 |
| JP2006110568A (en) * | 2004-10-12 | 2006-04-27 | Sanyo Special Steel Co Ltd | Mold powder for continuously casting high aluminum steel and method for continuously casting high aluminum steel |
| JP2006247712A (en) * | 2005-03-11 | 2006-09-21 | Jfe Steel Kk | Mold powder for continuous casting of steel |
| JP4708055B2 (en) * | 2005-03-11 | 2011-06-22 | Ｊｆｅスチール株式会社 | Mold powder for continuous casting of steel |
| JP2009541060A (en) * | 2006-06-22 | 2009-11-26 | ポスコ | Mold flux and continuous casting method using the same |
| JP2010036193A (en) * | 2008-07-31 | 2010-02-18 | Nippon Steel & Sumikin Metal Products Co Ltd | Powder for continuously casting steel |
| CN102151812A (en) * | 2010-02-11 | 2011-08-17 | 宝山钢铁股份有限公司 | Freon-free environment-friendly continuous casting slag |
| CN103317111A (en) * | 2012-03-22 | 2013-09-25 | 宝山钢铁股份有限公司 | Fluoride-free mold powder for low-carbon steel |
| 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 |
| WO2014114123A1 (en) | 2013-01-25 | 2014-07-31 | 宝山钢铁股份有限公司 | Fluoride-free continuous casting mold flux for ultralow carbon steel |
| US9550229B2 (en) | 2013-01-25 | 2017-01-24 | Baoshan Iron & Steel Co., Ltd. | Fluoride-free continuous casting mold flux for ultralow-carbon steel |
| CN105642851A (en) * | 2016-03-09 | 2016-06-08 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag for large slab medium-carbon steel and preparation method thereof |
| JP2020192536A (en) * | 2019-05-24 | 2020-12-03 | 日本製鉄株式会社 | Mold powder for continuous casting |
| JP7284397B2 (en) | 2019-05-24 | 2023-05-31 | 日本製鉄株式会社 | Mold powder for continuous casting |
| JP7469615B2 (en) | 2020-03-16 | 2024-04-17 | 品川リフラクトリーズ株式会社 | Manufacturing method of mold powder and sintering raw material |
| CN114905013A (en) * | 2022-05-16 | 2022-08-16 | 江阴兴澄特种钢铁有限公司 | Crystallizer casting powder suitable for casting round billets with diameter of 1000mm and above and preparation method thereof |
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