JP2629730B2 - Block for tundish weir - Google Patents
Block for tundish weirInfo
- Publication number
- JP2629730B2 JP2629730B2 JP62231185A JP23118587A JP2629730B2 JP 2629730 B2 JP2629730 B2 JP 2629730B2 JP 62231185 A JP62231185 A JP 62231185A JP 23118587 A JP23118587 A JP 23118587A JP 2629730 B2 JP2629730 B2 JP 2629730B2
- Authority
- JP
- Japan
- Prior art keywords
- cao
- mgo
- powder
- block
- less
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/118—Refining the metal by circulating the metal under, over or around weirs
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Ceramic Products (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、鋼のクリーンスチールを目的としたCaO質
コート層を有するタンディッシュ堰用ブロックに関する
ものである。Description: TECHNICAL FIELD The present invention relates to a block for a tundish weir having a CaO-type coating layer for the purpose of steel clean steel.
［従来の技術］ 従来、製鋼用タンディッシュ（以下TDという）堰には
定形、不定形耐火物を問わずその材質としてAl2O3−SiO
2系のものが主として使用されてきた。しかしながら同
材質は溶損により溶鋼中に介在物として残留し、鋼の品
質を著しく低下させるという欠点を有していた。[Prior art] Conventionally, tundish for steelmaking (hereinafter referred to as TD) weir is made of Al 2 O 3 -SiO, regardless of whether it is a fixed or irregular refractory.
Two series have been mainly used. However, this material has a defect that it remains as inclusions in the molten steel due to erosion and significantly degrades the quality of the steel.
また、そのほかMgO質堰、CaO質堰さらにはAl2O3−SiO
2質本体にMgO質被覆を施こしたものも提案されている。In addition, other MgO weirs, CaO weirs, and Al 2 O 3 --SiO
A body in which a MgO material coating is applied to a two- material body has also been proposed.
［発明の解決しようとする問題点］ 従来提案されていた堰用ブロックで、MgO堰は溶鋼中
のAl2O3の吸着能力がCaO質に比して低く、一方CaO質堰
はAl2O3の吸着能はあるが本体がCaO質鋳物からなってい
るので、スレーキング或は低融点化合物を生成すること
により亀裂や破損が発生し易いという欠点をもっている
ばかりか原料的にも高価である。[Problems to be Solved by the Invention] In a weir block that has been conventionally proposed, a MgO weir has a lower adsorption capacity of Al 2 O 3 in molten steel than a CaO material, whereas a CaO weir has an Al 2 O Although it has the adsorbing ability of 3 , it has a drawback that cracks and breakage are liable to occur due to slaking or formation of a low melting point compound because the main body is made of CaO-based casting, and it is expensive as a raw material.
また、Al2O3−SiO2本体へのMgO質被覆は溶鋼中のAl2O
3吸着能力がやはり十分でない。Further, Al 2 O in MgO protein coating the molten steel to Al 2 O 3 -SiO 2 body
3 Adsorption capacity is still not enough.
本発明はこのような従来の堰用ブロックのもつそれぞ
れの欠点を同時に解消せしめることに成功したものであ
る。The present invention has succeeded in resolving the respective disadvantages of the conventional weir block at the same time.
［問題点を解決するための手段］ 即ち、本発明は、CaO質耐火粒子を主成分とし、微粉
部が100μ以下のCaO質及び又はMgO質微粉で形成されて
なる不定形耐火物を表面に被覆してなることで特徴づけ
られたタンディッシュ堰用ブロックを要旨とするもので
ある。[Means for Solving the Problems] That is, the present invention provides an amorphous refractory having CaO-based refractory particles as a main component and a fine powder portion formed of CaO-based and / or MgO-based fine powder having a particle size of 100 μ or less on the surface. The gist of the present invention is a tundish weir block characterized by being coated.
本来、TD堰は、TD内に堰状に設けることにより、溶鋼
の滞留時間をのばし、又乱流等を発生させて、溶鋼中の
介在物を生長、拡大させ、浮上除去させる目的で使用さ
れるが、本発明の堰は、前述した堰本来の効果に加え
て、CaO又はCaO−MgO質不定形耐火物を堰の表面にコー
トすることによって、溶鋼中に残留して鋼に悪影響を与
えるAl2O3成分を吸着除去させるという特徴を有する。
以下に詳細に説明する。Originally, TD weirs are used in the form of weirs in TDs to extend the residence time of molten steel, generate turbulence, etc., and grow, expand, and float and remove inclusions in the molten steel. However, the weir of the present invention, in addition to the above-described original effect of the weir, by coating CaO or CaO-MgO-type irregular refractory on the surface of the weir, remains in the molten steel and adversely affects the steel. It has the characteristic of adsorbing and removing the Al 2 O 3 component.
This will be described in detail below.
本発明のCaO質コート層を有するMgO質TD堰の基本構造
を第１図及び第２図にて説明する。堰用ブロックは、例
えば最大深さ5m/m、最大幅100m/mの溝がそれぞれ最小5m
/m間隔で存在する表面を有するMgO質TD堰本体２とこの
全面にCaO質不定形耐火物を適度の水量によって混練し
た坏土をコテ塗り、吹き付け、又は流し込み等により施
工し、乾燥することにより得られる被覆１からなる成型
体である。The basic structure of the MgO-based TD weir having the CaO-based coating layer of the present invention will be described with reference to FIG. 1 and FIG. The weir block has, for example, a maximum depth of 5 m / m and a maximum width of 100 m / m with a minimum groove of 5 m each.
The TD dam body 2 having a surface existing at intervals of / m and a kneaded clay obtained by kneading a CaO-type amorphous refractory with an appropriate amount of water over the entire surface by ironing, spraying, pouring, or the like, and drying. Is a molded article composed of the coating 1 obtained by the above method.
本発明でこのようなブロックを構成するに施工される
不定形耐火物について説明すると、基本的には、前述し
た如く、CaO質耐火粒子を主成分とし、微粉部が100μ以
下のCaO及び又はMgO粉末で形成されているものである。In the present invention, an amorphous refractory constructed to constitute such a block will be described.Basically, as described above, CaO and / or MgO having a CaO-based refractory particle as a main component and a fine powder portion of 100 μ or less. It is formed of powder.
まずこれらにおいて主成分即ち骨材部を構成すること
になるCaO質耐火粒子は粒子径として0.1mm以上であるこ
とが望ましく、特には2mm〜0.1mmであることが好まし
い。これは、粒子径の0.1mm以下が主成分となるとCaOク
リンカーとしてスレーキングにより弊害が生じ耐久性が
十分でなくなるからである。First, in these, the main component, that is, the CaO-based refractory particles constituting the aggregate portion preferably have a particle diameter of 0.1 mm or more, particularly preferably 2 mm to 0.1 mm. This is because, if the particle diameter is 0.1 mm or less as a main component, the CaO clinker will cause adverse effects due to slaking, resulting in insufficient durability.
また、主成分としてのCaO質粒子は、堰用ブロックの
被覆層としての十分なクリーンスチール効果をもたらす
ものとして必要で、通常はCaO成分が98％（重量％、以
下同じ）以上からなるCaOクリンカーが好適に使用され
る。In addition, the CaO-based particles as the main component are necessary to provide a sufficient clean steel effect as a coating layer of the weir block, and the CaO clinker usually contains 98% or more (wt%, the same applies hereinafter) of the CaO component. Is preferably used.
これに対し、不定形耐火物を構成する微粉部即ち結合
部の中心は100μ以下のCaO質および又はMgO質粉末であ
る。これはクリーンスチール効果を損わず不定形耐火物
被覆層が、堰本体から剥離しないような効果をもたらす
ものである。On the other hand, the center of the fine powder portion, that is, the bonding portion constituting the amorphous refractory is CaO and / or MgO powder of 100 μm or less. This provides an effect that the amorphous refractory coating layer does not peel off from the dam body without impairing the clean steel effect.
なお、このような微粉部において100μ以下が70％以
上で５μ以下は５％以下が望ましい。これは５μ以下の
CaO又はMgO微粉が多くなると、坏土のコテ塗り性状の低
下、混練水量が多くなることによる不定形耐火物層の強
度低下、などの点で好ましくないからである。In such a fine powder portion, it is desirable that 100 μ or less is 70% or more and 5 μ or less is 5% or less. This is less than 5μ
This is because an increase in the amount of CaO or MgO fine powder is not preferable in terms of, for example, a decrease in the ironing property of the clay and a decrease in the strength of the amorphous refractory layer due to an increase in the amount of kneading water.
ここで、これらのCaO質およびMgO質微粉は、そのいず
れであってもよいが、望ましくはMgO質微粉が高温にお
けるスラグとの反応抵抗性が大きいなどの点で最良であ
る。Here, any of these CaO-based and MgO-based fine powders may be used, but it is preferable that the MgO-based fine powders have high resistance to reaction with slag at a high temperature.
不定形耐火物のこのような配合において骨材の粒子と
微粉部の割合は、前者60〜90％、後者40〜10％が望まし
く、これはこのような配合において溶鋼中のAl2O3の除
去効果が最も発揮されるからである。In such a mixture of amorphous refractories, the ratio of aggregate particles to fine powder is desirably 60 to 90% in the former and 40 to 10% in the latter, and this is the proportion of Al 2 O 3 in molten steel in such a mixture. This is because the removal effect is most exhibited.
なお、不定形耐火物中におけるCaOとMgOの比率は、Ca
Oが90〜60％、MgOが10〜40％が好ましく、これはコテ塗
り性状の向上、堰本体からのコート層の剥離防止などの
ためである。The ratio of CaO and MgO in the amorphous refractory is Ca
The O content is preferably 90 to 60% and the MgO content is preferably 10 to 40%, for the purpose of improving the ironing properties and preventing the coating layer from peeling from the weir body.
本発明におけるより望ましい態様についてさらに説明
すると、結合部における改良がそれであり、結合材とな
る微粉部の成分として、（１）珪酸ソーダ粉末（１号、
２号、３号のいずれでもよい）の10％以下と硬化剤（珪
酸ソーダなど）２〜５％、（２）５μ以下のSiO2微粉２
〜８％、（３）粘土又はベントナイトの少なくとも１種
１〜４％、のいずれか１以上好ましくこれらを同時に併
用することである。To further explain a more desirable aspect of the present invention, the improvement in the bonding portion is that. (1) Sodium silicate powder (No. 1,
No. 2 or 3) and 2 to 5% of a curing agent (such as sodium silicate), (2) 5 μm or less of SiO 2 fine powder 2
-8%, (3) at least one of clay or bentonite, 1-4%, and preferably at least one of them.
なお、これらの結合成分の割合はいずれも不定形耐火
物配合物全体としてのこれらを含めた分量中の％であ
る。In addition, the ratio of these binding components is% in the amount including these as the whole amorphous refractory composition.
ここでこれらの各成分は被覆層乾燥後の付着性向上
（特に珪酸ソーダ、粘土、ベントナイト）、高温におけ
る付着性向上（特に微粉SiO2）、CaOのスレーキング防
止（特に珪酸ソーダ）に有効である。Here, these components are effective for improving the adhesion after drying the coating layer (particularly, sodium silicate, clay, bentonite), improving the adhesion at high temperature (particularly, finely divided SiO 2 ), and preventing CaO slaking (particularly, sodium silicate). .
本発明でこれらの効果をさらに発揮させるに適した成
分として硼砂粉末、硼酸粉末又は硼酸塩粉末の１種以上
があり、また繊維質がある。In the present invention, one or more kinds of borax powder, boric acid powder or borate powder are included as components suitable for further exerting these effects, and fibrous materials.
硼砂粉末、硼酸粉末又は硼酸塩粉末の１種以上は中間
温度域における強度向上に有効であり、無水硼酸（B
2O3）として換算して１〜２％程度、繊維質は長さ10〜1
5m/m程度、直径300〜500μ程度のものを１〜３％程度例
えば２％程度配合することにより不定形耐火物層の堰本
体への付着性の向上が期待される。At least one of borax powder, boric acid powder and borate powder is effective for improving strength in an intermediate temperature range, and boric anhydride (B
About 2 to 2% in terms of 2 O 3 ), fiber length 10 to 1
It is expected that the adhering property of the amorphous refractory layer to the weir main body is improved by mixing about 1% to about 3%, for example about 2%, of about 5 m / m and about 300 to 500 μm in diameter.
なお、繊維質は、有機質、無機質のいずれであっても
使用可能である。The fibrous material may be organic or inorganic.
本発明で堰本体はクリーンスチール効果のある従来か
ら知られているMgO,CaO,Al2O3−SiO2などの材質からつ
くられたいずれであってもよいが、MgO質が最良であ
り、Al2O3−SiO2質がついでよい。堰本体がCaO質である
と、表面のCaO質がフレーク或は低融点化合物を生成し
溶損した場合、本体も同様に亀裂、破壊に至る恐れがあ
るからである。Weir body in the present invention may be either made MgO known from the prior art with a clean steel effect, CaO, of a material such as Al 2 O 3 -SiO 2, but it is best MgO quality, Al 2 O 3 —SiO 2 may follow. If the weir body is made of CaO, if the CaO material on the surface generates flakes or low-melting compounds and dissolves, the body may be similarly cracked or broken.
また、堰本体の形状は、第１図に示すものに限らず種
々の形態が可能で、例えば被覆層形成面には任意の凹
凸、溝、などを適当数形成することなどである。The shape of the weir body is not limited to that shown in FIG. 1, and various forms are possible. For example, an appropriate number of irregularities, grooves, and the like are formed on the surface on which the coating layer is formed.
さらに本発明で被覆層の厚みは5mm程度以上あれば目
的の効果が発揮されるが、好ましくは10〜20mm程度であ
る。Furthermore, in the present invention, the desired effect is exhibited if the thickness of the coating layer is about 5 mm or more, but is preferably about 10 to 20 mm.
また被覆層は多層として形成することも勿論有効であ
る。It is of course also effective to form the coating layer as a multilayer.
［実施例］ 第１表に示す各原料を十分混練し、表中に示した添加
水量（外掛）で混練した坏土を第１図に示したMgO質タ
ンディッシュ堰本体２の片側全面にコテ塗り施工でコー
トし、乾燥することによりCaO−MgO質コート層１を有す
るMgO質TD堰用ブロックを得た。[Example] Each of the raw materials shown in Table 1 was sufficiently kneaded, and the kneaded clay kneaded with the amount of added water (outer hook) shown in the table was coated on the entire surface of one side of the MgO-based tundish weir body 2 shown in FIG. By coating by coating and drying, an MgO-type TD weir block having a CaO-MgO-type coat layer 1 was obtained.
なお、被覆層の厚み（溝の深さ5mmは別）は10mmであ
った。The thickness of the coating layer (except for the depth of the groove of 5 mm) was 10 mm.
第２表に被覆層の主成分の化学分析値および被覆層の
諸物性を示す。Table 2 shows the chemical analysis values of the main components of the coating layer and various physical properties of the coating layer.
このような各試料を実機においてTD堰として配置し、
８連鋳使用後の結果は次の通りであった。Each such sample is arranged as a TD weir in the actual machine,
The results after the use of eight continuous castings were as follows.
1.使用後の外観性状 CaO−MgO質コート層は亀裂の発生、又はMgO質TD堰か
らの剥離脱落等もなく良好である。1. Appearance after use The CaO-MgO coating layer is good without cracks or peeling off from the MgO TD dam.
2.Al2O3成分の分析 CaO−MgO質コート層のＸ線回折により稼動面から約30
0μの深さまで3CaO・Al2O3、12CaO・7Al2O3のピークが
同定された。又第３表に示すように化学分析の結果から
もAl2O3成分の吸着が確認された。2. Analysis of Al 2 O 3 component Approximately 30 from the working surface by X-ray diffraction of CaO-MgO coating layer
To a depth of 0μ 3CaO · Al 2 O 3, the peak of 12CaO · 7Al 2 O 3 were identified. Further, as shown in Table 3, the results of the chemical analysis confirmed the adsorption of the Al 2 O 3 component.
［発明の効果］ 本発明は、本体自体でもある程度のそして被覆層が十
分なるクリーンスチール効果をもつとともに、本体の亀
裂や破損の発生も殆どなく、万一亀裂が発生しても堰用
ブロックとして剥離することもなく耐久性の大なる堰と
して使用でき、全体として鋼のクリーンスチール化に大
変有利な効果をもたらすことが可能となったものでその
実用的価値は多大である。 [Effects of the Invention] The present invention has a clean steel effect in which the main body itself has a certain degree of cleanness and the coating layer is sufficient, and there is almost no occurrence of cracks or breakage of the main body. It can be used as a durable weir without peeling, and as a whole it is possible to bring about a very advantageous effect on the conversion of steel to clean steel, and its practical value is enormous.
第１図は、本発明堰ブロックの一例を示す本体の斜視
図、第２図は本発明ブロックの一例を示す断面図であ
る。 図にて、１は被覆層、２は本体である。FIG. 1 is a perspective view of a main body showing an example of the weir block of the present invention, and FIG. 2 is a sectional view showing an example of the block of the present invention. In the figure, 1 is a coating layer and 2 is a main body.
Claims (7)
μ以下のCaO質及び又はMgO質微粉で形成されてなる不定
形耐火物を表面に被覆してなることで特徴づけられたタ
ンディッシュ堰用ブロック。1. A refractory powder containing CaO-based refractory particles as a main component and a fine powder portion of 100
A tundish weir block characterized by being coated on its surface with an amorphous refractory made of fine powder of CaO and / or MgO of μ or less.
質耐火粒子の粒子径が2mm〜0.1mmであり、微粉部のCaO
質及び又はMgO質微粉は100μ以下が70重量％異状でかつ
５μ以下が10重量％以下である特許請求の範囲第１項記
載のブロック。2. An amorphous refractory, comprising CaO as a main component.
Quality refractory particles have a particle size of 2mm ~ 0.1mm, and the fine powder portion of CaO
2. The block according to claim 1, wherein the fine and / or MgO fine powder has a defect of 70% by weight when the particle size is 100 μ or less and 10% by weight or less when the particle size is 5 μ or less.
重量％でCaOが90〜60％、MgOが10〜40％である特許請求
の範囲第１項又は第２項記載のブロック。3. The block according to claim 1, wherein the ratio of CaO to MgO in the amorphous refractory is 90 to 60% by weight and 10 to 40% by weight of MgO in weight%.
化剤を２〜５％ （jj）５μ以下の微粉SiO2を２〜８％ （iii）粘土又はベントナイトの少なくとも１種を１〜
４％ のいずれか１以上を含む特許請求の範囲第１項、第２項
又は第３項記載のブロック。4. The amorphous refractories are, in weight%, (i) 10% or less of sodium silicate powder and 2 to 5% of hardening agent of sodium silicate powder (jj) 2 to 8% of fine powder SiO2 of 5 μ or less. % (Iii) at least one of clay and bentonite is 1 to
The block according to claim 1, 2 or 3, which contains any one or more of 4% and 4%.
粉末のいずれか１以上を含む特許請求の範囲第１項、第
２項又は第３項記載のブロック。5. The block according to claim 1, wherein the amorphous refractory contains at least one of borax, boric acid powder and borate powder.
許請求の範囲第１項、第２項、第３項、第４項又は第５
項記載のブロック。6. The method according to claim 1, wherein said refractory layer has a thickness of 5 to 20 mm.
The block described in the section.
範囲第１項、第２項、第３項、第４項、第５項又は第６
項記載のブロック。7. The first, second, third, fourth, fifth or sixth aspect of the present invention, wherein the block body is made of MgO.
The block described in the section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62231185A JP2629730B2 (en) | 1987-09-17 | 1987-09-17 | Block for tundish weir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62231185A JP2629730B2 (en) | 1987-09-17 | 1987-09-17 | Block for tundish weir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6475155A JPS6475155A (en) | 1989-03-20 |
| JP2629730B2 true JP2629730B2 (en) | 1997-07-16 |
Family
ID=16919658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62231185A Expired - Fee Related JP2629730B2 (en) | 1987-09-17 | 1987-09-17 | Block for tundish weir |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2629730B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03297544A (en) * | 1990-04-16 | 1991-12-27 | Sumitomo Metal Ind Ltd | Device for cleaning molten metal in tundish |
| JP4331924B2 (en) * | 2002-08-22 | 2009-09-16 | 黒崎播磨株式会社 | Continuous casting method for molten steel for sheet metal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5692159A (en) * | 1979-12-27 | 1981-07-25 | Harima Refractories Co Ltd | Manufacture of basic refractories containing lime in fine grain portion |
| JPS5776956U (en) * | 1980-10-23 | 1982-05-12 | ||
| JPS5834423A (en) * | 1981-08-26 | 1983-02-28 | Mitsubishi Electric Corp | Optical branching and coupling circuit |
| JPS6133742A (en) * | 1984-07-25 | 1986-02-17 | Kobe Steel Ltd | Production of tundish gate |
-
1987
- 1987-09-17 JP JP62231185A patent/JP2629730B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6475155A (en) | 1989-03-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |