JPH05105506A - Slide valve plate brick - Google Patents
Slide valve plate brickInfo
- Publication number
- JPH05105506A JPH05105506A JP3271179A JP27117991A JPH05105506A JP H05105506 A JPH05105506 A JP H05105506A JP 3271179 A JP3271179 A JP 3271179A JP 27117991 A JP27117991 A JP 27117991A JP H05105506 A JPH05105506 A JP H05105506A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- spinel
- mgo
- raw material
- alumina
- 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
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スライドバルブプレー
トれんがに関し、更に詳細には高耐食性Ａｌ2Ｏ3−スピ
ネル−カーボン質スライドバルブプレートれんがに関す
るものである。BACKGROUND OF THE INVENTION The present invention relates to a slide valve plate brick, more particularly high corrosion resistance Al 2 O 3 - Spinel - relates carbonaceous slide valve plate brick.
【０００２】[0002]
【従来の技術】スライドバルブプレートれんがの材質と
しては、現在Ａｌ2Ｏ3−Ｃ質のものが主流であるが、Ｃ
ａ処理鋼、高Ｏ2鋼(快削鋼、電磁鋼板)等の溶損鋼種を
受鋼した場合には、摺動面の溶損が大きく、極めて短命
に終わる。そのため、このような鋼種に対してはＭｇＯ
質、ＭｇＯ−スピネル質やスピネル−カーボン質の材質
が適用されている。2. Description of the Related Art Al 2 O 3 -C quality material is currently the main material for slide valve plate bricks.
When a melt-damaged steel grade such as a-treated steel, high O 2 steel (free-cutting steel, electromagnetic steel plate) is received, the melt-damage on the sliding surface is large and the life is extremely short. Therefore, for such steel types, MgO
Quality, MgO-spinel and spinel-carbon materials are used.
【０００３】例えば、特開昭57−88073号公報には、化
学成分としてＭｇＯ１５〜７５重量％、Ａｌ2Ｏ3２５〜
８５重量％、残部５重量％以下からなるマグネシア・ア
ルミナ系スピネル質原料６０〜９６重量部、カーボン質
原料４〜４０重量部、結合剤２〜１５重量部並びに適宜
シリコン、アルミニウム、マグネシウム等の金属粉や合
金粉を１０重量部以下添加・配合することができる混練
物を還元焼成してなるスランディングノズル用耐火物の
製造方法が開示されている。For example, in Japanese Patent Laid-Open No. 57-88073, 15 to 75% by weight of MgO and Al 2 O 3 to 25 are used as chemical components.
60 to 96 parts by weight of magnesia-alumina-based spinel raw material consisting of 85% by weight and the balance 5% by weight or less, 4 to 40 parts by weight of carbonaceous raw material, 2 to 15 parts by weight of binder, and a metal such as silicon, aluminum or magnesium as appropriate. Disclosed is a method for producing a refractory material for a landing nozzle, which is obtained by reducing and firing a kneaded material capable of adding and blending 10 parts by weight or less of powder or alloy powder.
【０００４】また、特開昭61−83670号公報には、Ａｌ2
Ｏ3４０〜７０重量％、ＭｇＯ２５〜６０重量％、残部
１０重量％以下からなるアルミナ−マグネシア系スピネ
ル質原料１０〜３０重量部と、ＭｇＯ９０重量％以上の
マグネシア質原料９０〜７０重量％とからなり、Ａｌ2
Ｏ3含量１０〜２５重量％、ＭｇＯ含量９０〜７５重量
％を含有することを特徴とするスライドゲート用耐火物
が開示されている。Further, Japanese Patent Laid-Open No. 61-83670 discloses Al 2
From 10 to 30 parts by weight of alumina-magnesia-based spinel raw material composed of 40 to 70% by weight of O 3 , 25 to 60% by weight of MgO, and the balance of 10% by weight or less, and 90 to 70% by weight of magnesia raw material of 90% by weight or more of MgO. Becomes Al 2
Disclosed is a refractory for a slide gate, which has an O 3 content of 10 to 25% by weight and an MgO content of 90 to 75% by weight.
【０００５】上述のようなＭｇＯ−スピネル質またはス
ピネル−カーボン質の材質はいずれも熱膨張率が大き
く、これらの材質からなるプレートれんがは急激な溶鋼
による加熱でスポーリングを起こし易く、プレートれん
がのエッヂ部の欠け、亀裂の拡大等により、繰り返し多
数回使用することが困難であり、大巾なプレートれんが
寿命の向上には至っていない。The above-mentioned MgO-spinel or spinel-carbon materials have a large coefficient of thermal expansion, and plate bricks made of these materials are apt to spall due to rapid heating by molten steel, and plate bricks. Due to the lack of edges, the expansion of cracks, etc., it is difficult to use it many times repeatedly, and the life of a large plate brick has not been improved.
【０００６】また、スピネル−カーボン質は、スピネル
粒の膨張が大きく、カーボンを含むマトリックスとの膨
張差が大きいため、反復的な加熱、冷却により組織内に
ギャップを生じ易く、強度が低下するという欠点があ
る。[0006] In spinel-carbonaceous matter, the expansion of spinel grains is large and the difference in expansion from the matrix containing carbon is large, so that repeated heating and cooling tend to cause gaps in the tissue, resulting in a decrease in strength. There are drawbacks.
【０００７】更に、特開平２−258158号公報には、Ｍｇ
Ｏ３０〜８０重量％、Ａｌ2Ｏ3２０〜６０重量％、残部
１０重量％以下からなる粒度０.５９ｍｍ以上のマグネ
シア−アルミナ質スピネル原料５〜５０重量部と；アル
ミナ原料４０〜８０重量部と；カーボン質原料１〜７重
量部とからなることを特徴とするスライディングノズル
用耐火物が開示されている。Further, Japanese Patent Laid-Open No. 2-258158 discloses Mg
5 to 50 parts by weight of a magnesia-alumina spinel raw material having a grain size of 0.59 mm or more and consisting of 30 to 80% by weight of O, 20 to 60% by weight of Al 2 O 3 , and the balance of 10% by weight or less; A refractory for a sliding nozzle, which comprises 1 to 7 parts by weight of a carbonaceous raw material.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、特開平
２−258158号公報の技術では、結合部での強度劣化は若
干少なくなったが、未だ充分な耐用性の高いスライディ
ングノズル用耐火物は得られていないのが現状である。However, in the technique disclosed in Japanese Patent Laid-Open No. 2-258158, although the strength deterioration at the joint is slightly reduced, a refractory for a sliding nozzle having a sufficiently high durability can be obtained. The current situation is not.
【０００９】従って、本発明の目的は、ＭｇＯ−スピネ
ル質またはスピネル−カーボン質の材質固有の熱膨張率
を小さくし、耐スポール性に優れ、強固で脆化し難い組
成を有する材質よりなるスライドバルブプレートれんが
を提供することにある。Therefore, an object of the present invention is to make a slide valve made of a material which has a small coefficient of thermal expansion characteristic of MgO-spinel or spinel-carbon material, is excellent in spall resistance, and is strong and is not easily embrittled. It is to provide plate bricks.
【００１０】[0010]
【課題を解決するための手段】即ち、本発明に係るスラ
イドバルブプレートれんがは、ＭｇＯ含量が３０〜７０
重量％で、かつＡｌ2Ｏ3＋ＭｇＯの合計量が９５重量％
以上のマグネシア・アルミナ質スピネル原料５〜２５重
量％、Ａｌ2Ｏ3含量が８０重量％以上のアルミナ原料６
０〜８５重量％、カーボン質原料３〜１５重量％、金属
アルミニウム粉１〜６重量％及び金属シリコン、炭化硼
素、炭化珪素及び窒化珪素からなる群から選択される１
種または２種以上を１０重量％以下含有してなることを
特徴とする。The slide valve plate brick according to the present invention has a MgO content of 30 to 70.
% By weight, and the total amount of Al 2 O 3 + MgO is 95% by weight
5 to 25% by weight of magnesia / alumina spinel raw material, and an alumina raw material 6 having an Al 2 O 3 content of 80% by weight or more
0 to 85% by weight, carbonaceous raw material 3 to 15% by weight, metallic aluminum powder 1 to 6% by weight and metallic silicon, boron carbide, silicon carbide and silicon nitride selected from the group 1
It is characterized by containing 10% by weight or less of one kind or two or more kinds.
【００１１】[0011]
【作用】本発明に使用されるマグネシア・アルミナ系ス
ピネル原料はＭｇＯ含量が３０〜７０重量％で、かつＡ
ｌ2Ｏ3＋ＭｇＯの合計量が９５重量％以上からなるもの
を使用する。ＭｇＯ・Ａｌ2Ｏ3の化学式で表されるスピ
ネル鉱物の理論組成はＭｇＯ：２８重量％、Ａｌ2Ｏ3：
７２重量％であり、本発明に使用するマグネシア・アル
ミナ質原料は理論組成スピネルよりも過剰にＭｇＯを含
有するものである。この過剰なＭｇＯ成分は焼成または
使用中に溶鋼からの受熱によって共存するアルミナ原料
と反応し、２次的にスピネルを生成し、強固で脆化し難
い組織を形成する。ＭｇＯ含量が３０重量％未満では２
次スピネルの生成が不十分であり、また、ＭｇＯ含量が
７０重量％を超えると過剰のＭｇＯが周囲に拡散した後
のスピネル粒自体がポーラスな組織となり、強度はむし
ろ低下する。マグネシア・アルミナ質原料の純度は耐食
性の点から高純度であることが望ましく、ＳｉＯ2、Ｃ
ａＯ、Ｆｅ2Ｏ3等の不純物は５重量％未満であるもので
なければならない。スピネル原料の粒度は均一な２次ス
ピネルの生成という観点から微細であることが好まし
く、中粒ないし微粉で添加するのが好ましい。The magnesia-alumina spinel raw material used in the present invention has a MgO content of 30 to 70% by weight, and
The total amount of l 2 O 3 + MgO used is 95% by weight or more. The theoretical composition of the spinel mineral represented by the chemical formula of MgO.Al 2 O 3 is MgO: 28% by weight, Al 2 O 3 :
It is 72% by weight, and the magnesia-alumina raw material used in the present invention contains MgO in excess of the theoretical composition spinel. This excess MgO component reacts with the coexisting alumina raw material due to the heat received from the molten steel during firing or use, secondarily produces spinel, and forms a strong and hard-to-brittle structure. 2 if the MgO content is less than 30% by weight
The formation of the secondary spinel is insufficient, and if the MgO content exceeds 70% by weight, the spinel grains themselves after the excess MgO has diffused into the surroundings have a porous structure and the strength rather decreases. It is desirable purity magnesia-alumina raw material of high purity in terms of corrosion resistance, SiO 2, C
Impurities such as aO and Fe 2 O 3 should be less than 5% by weight. The particle size of the spinel raw material is preferably fine from the viewpoint of forming a uniform secondary spinel, and it is preferable to add it as a medium particle or a fine powder.
【００１２】なお、マグネシア・アルミナ質原料の使用
量が５重量％未満では耐食性向上の効果がなく、一方、
スピネル原料が２５重量％を超えると耐スポール性が低
下してしまう。If the amount of the magnesia / alumina raw material used is less than 5% by weight, there is no effect of improving the corrosion resistance.
If the spinel raw material exceeds 25% by weight, the spall resistance deteriorates.
【００１３】また、アルミナ原料としては焼結アルミ
ナ、電融アルミナ、ボーキサイト、仮焼アルミナ、ムラ
イト、合成ムライトクリンカー、コランダム等が使用で
きる。As the alumina raw material, sintered alumina, fused alumina, bauxite, calcined alumina, mullite, synthetic mullite clinker, corundum and the like can be used.
【００１４】上記２次スピネルの生成反応としては、Ｍ
ｇＯとＡｌ2Ｏ3の直接反応による固相拡散も起こってい
るが、ＭｇＯが還元雰囲気中で分解してＭｇガスとして
拡散する気相拡散も起こっている。従って、本発明にお
いては、金属アルミニウム粉を１〜６重量％添加するこ
とにより、れんが内部の酸素分圧が低下し、ＭｇＯの気
相拡散を促進し、れんが内により均一な２次スピネルを
生成することができる。添加する金属アルミニウム粉の
粒度としては４０メッシュ以下の粉状またはフレーク状
のものが使用できる。As a reaction for producing the secondary spinel, M
Solid phase diffusion occurs due to a direct reaction between gO and Al 2 O 3 , but vapor phase diffusion in which MgO decomposes in a reducing atmosphere and diffuses as Mg gas also occurs. Therefore, in the present invention, by adding 1 to 6% by weight of metallic aluminum powder, the oxygen partial pressure inside the brick is lowered, the vapor phase diffusion of MgO is promoted, and a more uniform secondary spinel is produced in the brick. can do. As the particle size of the metal aluminum powder to be added, powder or flakes having a size of 40 mesh or less can be used.
【００１５】カーボン原料は耐スポール性向上及びプレ
ートへの地金の焼付き防止を目的として添加されるもの
であり、本発明では鱗状黒鉛、コークス粉、カーボンブ
ラック等のカーボン原料を３〜１５重量％使用する。カ
ーボン原料の使用量が３重量％未満では耐スポール性向
上の効果がなく、また、１５重量％を超えるとれんがの
強度低下が大きく、酸化による組織劣化も著しい。The carbon raw material is added for the purpose of improving spall resistance and preventing seizing of the metal on the plate. In the present invention, 3 to 15 weight parts of the carbon raw material such as scaly graphite, coke powder and carbon black are used. %use. If the amount of the carbon raw material used is less than 3% by weight, the effect of improving spall resistance will not be obtained, and if it exceeds 15% by weight, the strength of the brick will be greatly reduced and the structure will be significantly deteriorated by oxidation.
【００１６】また、本発明のれんがには、必要に応じて
金属シリコン粉末、炭化硼素、炭化珪素、窒化珪素等を
酸化防止剤として使用することができる。これらの酸化
防止剤は単独または２種以上を併用することができる
が、合計量が１０重量％を超えると耐食性の低下が大き
くなる。In the brick of the present invention, metal silicon powder, boron carbide, silicon carbide, silicon nitride or the like can be used as an antioxidant, if necessary. These antioxidants can be used alone or in combination of two or more kinds, but if the total amount exceeds 10% by weight, the corrosion resistance is greatly deteriorated.
【００１７】以上の原料を使用し、フェノール樹脂、フ
ラン樹脂、タール、ピッチ等の結合剤を添加して混練
し、オイルプレス等により成形、乾燥した後、還元雰囲
気中で焼成し、必要に応じピッチ含浸処理を行えば、本
発明のスライドバルブプレートれんがを得ることができ
る。Using the above raw materials, a binder such as phenol resin, furan resin, tar or pitch is added and kneaded, molded by an oil press or the like, dried, and then fired in a reducing atmosphere, if necessary. The slide valve plate brick of the present invention can be obtained by performing pitch impregnation treatment.
【００１８】[0018]
実施例 表１に本発明のスライドバルブプレートれんがの配合を
比較例と共に示す。それぞれの配合物はバインダーを加
え、下回りミキサーで混練し、ＳＶプレート形状にオイ
ルプレスを用いて形成し、１７０℃で乾燥した後、所定
の焼成温度でコークスブリーズ中で還元焼成した。Examples Table 1 shows the composition of the slide valve plate brick of the present invention together with comparative examples. Each compound was added with a binder, kneaded with a lower mixer, formed into an SV plate shape using an oil press, dried at 170 ° C., and then reduction-fired in a coke breeze at a predetermined firing temperature.
【００１９】得られた試料の耐食性は高周波誘導炉に内
張りし、ＳＳ−４１と転炉スラグを用いて１６５０℃、
３時間試験を行い、溶損量を測定した。耐スポール性は
８０×８０×４０ｍｍの試料を１７５０℃のアセチレン
トーチで急熱し、亀裂発生状況を観察した。The corrosion resistance of the obtained sample was lined in a high-frequency induction furnace, and SS-41 and converter slag were used at 1650 ° C.
A test was performed for 3 hours to measure the amount of melting loss. Regarding the spall resistance, a sample of 80 × 80 × 40 mm was rapidly heated with an acetylene torch at 1750 ° C., and the crack generation state was observed.
【００２０】[0020]
【表１】 [Table 1]
【００２１】上記表１から、示す本発明品はいずれもス
ピネル−カーボンれんが(比較例２)に比較し、耐スポー
ル性に優れ、かつほぼ同等の高耐食性を有している。ま
た、比較例１に見られるような再加熱による組織の脆化
が少なく、強固な組織を保っていることが観察できる。The products of the present invention shown in Table 1 above are superior in spall resistance to spinel-carbon bricks (Comparative Example 2) and have substantially the same high corrosion resistance as that of the spinel-carbon bricks (Comparative Example 2). Further, it can be observed that the embrittlement of the structure due to reheating as seen in Comparative Example 1 is small and a strong structure is maintained.
【００２２】更に、本発明品である実施例２及び５をＡ
製鉄所のタンディッシュＳＶに適用した結果、比較例１
のれんがに比較し、エッヂ部の損傷が約１／２となり、
耐用回数は比較品１のれんがが５〜６チャージであった
のに対し、７〜８チャージとなり、著しい耐用性の向上
を示した。Furthermore, Examples 2 and 5 of the present invention are
As a result of being applied to a tundish SV at a steel mill, Comparative Example 1
Compared to brick, damage to the edge is about 1/2,
The durability of the brick of Comparative product 1 was 5 to 6 charges, while it was 7 to 8 charges, showing a remarkable improvement in durability.
【００２３】[0023]
【発明の効果】本発明のスライドバルブプレートれんが
は、耐食性並びに耐スポール性に優れ、スライドバルブ
プレートれんがの耐用性を大幅に向上することができ
る。The slide valve plate brick of the present invention has excellent corrosion resistance and spall resistance, and can greatly improve the durability of the slide valve plate brick.
Claims (1)
Ａｌ2Ｏ3＋ＭｇＯの合計量が９５重量％以上のマグネシ
ア・アルミナ質スピネル原料５〜２５重量％、Ａｌ2Ｏ3
含量が８０重量％以上のアルミナ原料６０〜８５重量
％、カーボン質原料３〜１５重量％、金属アルミニウム
粉１〜６重量％及び金属シリコン、炭化硼素、炭化珪素
及び窒化珪素からなる群から選択される１種または２種
以上を１０重量％以下含有してなることを特徴とするス
ライドバルブプレートれんが。1. A magnesia-alumina spinel raw material having a MgO content of 30 to 70% by weight and a total amount of Al 2 O 3 + MgO of 95% by weight or more, 5 to 25% by weight, and Al 2 O 3
60 to 85% by weight of alumina raw material having a content of 80% by weight or more, 3 to 15% by weight of carbonaceous raw material, 1 to 6% by weight of metallic aluminum powder, and selected from the group consisting of metallic silicon, boron carbide, silicon carbide and silicon nitride. A slide valve plate brick, characterized by containing 10% by weight or less of one kind or two kinds or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3271179A JP2971642B2 (en) | 1991-10-18 | 1991-10-18 | Slide valve plate brick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3271179A JP2971642B2 (en) | 1991-10-18 | 1991-10-18 | Slide valve plate brick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05105506A true JPH05105506A (en) | 1993-04-27 |
| JP2971642B2 JP2971642B2 (en) | 1999-11-08 |
Family
ID=17496449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3271179A Expired - Fee Related JP2971642B2 (en) | 1991-10-18 | 1991-10-18 | Slide valve plate brick |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2971642B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995012764A1 (en) * | 1993-11-02 | 1995-05-11 | Koyo Seiko Co., Ltd. | Ball-and-roller bearing |
| WO2003064079A1 (en) * | 2002-01-28 | 2003-08-07 | Jfe Steel Corporation | Immersion nozzle for continuous casting of steel and continuous casting method of steel |
| KR100446899B1 (en) * | 1999-12-21 | 2004-09-04 | 주식회사 포스코 | Mortar Material of Refractory Bricks for Torpedo Ladle Car |
| JP2012036064A (en) * | 2010-08-11 | 2012-02-23 | Kurosaki Harima Corp | Alumina-carbon unfired brick for lining molten metal holding furnace, method for producing the same, and furnace equipment and construction method using the same |
| JP5565907B2 (en) * | 2008-03-25 | 2014-08-06 | 黒崎播磨株式会社 | Plate brick and manufacturing method thereof |
| JP2017190254A (en) * | 2016-04-11 | 2017-10-19 | 品川リフラクトリーズ株式会社 | Manufacturing method of carbon-containing plate refractory for sliding nozzle |
| CN116283315A (en) * | 2022-12-30 | 2023-06-23 | 马鞍山利尔开元新材料有限公司 | Carbon-free inorganic pressed spinel sliding plate brick and preparation method thereof |
-
1991
- 1991-10-18 JP JP3271179A patent/JP2971642B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995012764A1 (en) * | 1993-11-02 | 1995-05-11 | Koyo Seiko Co., Ltd. | Ball-and-roller bearing |
| US5575571A (en) * | 1993-11-02 | 1996-11-19 | Koyo Seiko Co., Ltd. | Rolling bearing |
| KR100446899B1 (en) * | 1999-12-21 | 2004-09-04 | 주식회사 포스코 | Mortar Material of Refractory Bricks for Torpedo Ladle Car |
| WO2003064079A1 (en) * | 2002-01-28 | 2003-08-07 | Jfe Steel Corporation | Immersion nozzle for continuous casting of steel and continuous casting method of steel |
| US7575135B2 (en) | 2002-01-28 | 2009-08-18 | Jfe Steel Corporation | Immersion nozzle for continuous casting of steel and method of continuous casting method of steel |
| JP5565907B2 (en) * | 2008-03-25 | 2014-08-06 | 黒崎播磨株式会社 | Plate brick and manufacturing method thereof |
| JP2012036064A (en) * | 2010-08-11 | 2012-02-23 | Kurosaki Harima Corp | Alumina-carbon unfired brick for lining molten metal holding furnace, method for producing the same, and furnace equipment and construction method using the same |
| JP2017190254A (en) * | 2016-04-11 | 2017-10-19 | 品川リフラクトリーズ株式会社 | Manufacturing method of carbon-containing plate refractory for sliding nozzle |
| CN116283315A (en) * | 2022-12-30 | 2023-06-23 | 马鞍山利尔开元新材料有限公司 | Carbon-free inorganic pressed spinel sliding plate brick and preparation method thereof |
| CN116283315B (en) * | 2022-12-30 | 2023-12-19 | 马鞍山利尔开元新材料有限公司 | Carbon-free inorganic pressed spinel sliding plate brick and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2971642B2 (en) | 1999-11-08 |
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