JP2698010B2 - Refractory sleeve for converter tap hole - Google Patents
Refractory sleeve for converter tap holeInfo
- Publication number
- JP2698010B2 JP2698010B2 JP4340467A JP34046792A JP2698010B2 JP 2698010 B2 JP2698010 B2 JP 2698010B2 JP 4340467 A JP4340467 A JP 4340467A JP 34046792 A JP34046792 A JP 34046792A JP 2698010 B2 JP2698010 B2 JP 2698010B2
- Authority
- JP
- Japan
- Prior art keywords
- peripheral portion
- refractory
- inner peripheral
- carbon
- outer peripheral
- 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
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- Compositions Of Oxide Ceramics (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、マグネシア−カーボン
質の転炉出鋼孔用スリーブ耐火物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnesia-carbon-based sleeve refractory for a converter tap hole.
【０００２】[0002]
【従来の技術】転炉出鋼孔用スリーブ耐火物の材質とし
ては、一般にマグネシア−カーボン質耐火物が使用され
ている。特開昭５５−１１６６８５号公報、特開昭６２
−２０２０１６号公報、実開昭６２−１００４９６号公
報に見られるとおりである。このマグネシア−カーボン
質耐火物は、耐食性および耐スポーリング性に優れた材
質として知られている。2. Description of the Related Art A magnesia-carbon refractory is generally used as a material of a sleeve refractory for a converter steel outlet hole. JP-A-55-116385 and JP-A-62
20202016 and Japanese Utility Model Laid-Open No. 62-100496. This magnesia-carbon refractory is known as a material having excellent corrosion resistance and spalling resistance.
【０００３】[0003]
【発明が解決しようとする課題】しかし、炉内面側のみ
が稼動面となる内張り耐火物と異なり、転炉出鋼孔用ス
リーブ耐火物は、溶鋼が内孔を流通することで長さ方向
全体が稼動面となるために加熱−冷却に伴う膨脹収縮が
著しく、マグネシア−カーボン質耐火物であっても引っ
張り応力に起因する亀裂が背面側に発生する。そして、
この亀裂が進展し稼働面に達した時、使用中に脱落や抜
け落ちが生じることがある。また、亀裂に溶鋼・スラグ
が浸入し、その溶着によって耐火物の解体が容易でな
い。However, unlike the refractory lining, in which only the inner side of the furnace becomes the operating surface, the sleeve refractory for the converter outlet hole has the entire length in the longitudinal direction due to the flow of molten steel through the inner hole. Is a working surface, so that expansion and contraction accompanying heating and cooling is remarkable, and cracks due to tensile stress are generated on the back side even with magnesia-carbon refractories. And
When the crack propagates and reaches the operating surface, it may fall off or fall off during use. In addition, molten steel and slag penetrate into the crack, and the welding makes it difficult to disassemble the refractory.
【０００４】本発明は、転炉出鋼孔用スリーブ耐火物に
おける上記従来の問題を解決することを目的とする。An object of the present invention is to solve the above-mentioned conventional problems in a refractory sleeve for a converter tap hole.
【０００５】[0005]
【課題を解決するための手段】本発明は、全体がマグネ
シア−カーボン質耐火物よりなり、かつ、内周部にアル
ミナを含有すると共に、カーボン含有量を内周部より外
周部で少なくしたことを特徴とする転炉出鋼孔用スリー
ブ耐火物である。According to the present invention, there is provided a magnesia-carbon refractory, which contains alumina in an inner peripheral portion and has a carbon content outside the inner peripheral portion.
It is a sleeve refractory for a converter tapping steel hole characterized in that it is reduced in the peripheral part .
【０００６】本発明では、内周部にアルミナを含有す
る。アルミナは使用中の約１１００℃の高温下でマグネ
シアと反応し、ＭｇＯ・Ａｌ2Ｏ3系スピネルを生成する
が、その際の反応に伴う体積膨張でスリーブ耐火物の内
周部の組織を緻密化して、溶鋼・スラグの浸入を抑制す
る効果がある。In the present invention, alumina is contained in the inner peripheral portion. Alumina reacts with magnesia at a high temperature of about 1100 ° C during use to form MgO · Al 2 O 3 spinel. The volume expansion accompanying the reaction causes the structure of the inner periphery of the sleeve refractory to become denser. It has the effect of suppressing infiltration of molten steel and slag.
【０００７】スリーブ耐火物の外周部は、溶鋼と直接接
触しないので内周部に比べて温度変動が小さいが、内周
部の熱膨脹を受けて外周部に引っ張り応力が生じ、亀裂
が発生しやすい。そこで本発明では、カーボン含有量の
低減で引っ張り応力に対する強度が大きいマグネシア−
カーボン質耐火物を外周部に配置し、外周部の亀裂発生
を防止する。The outer peripheral portion of the sleeve refractory does not come into direct contact with the molten steel, so that the temperature fluctuation is smaller than that of the inner peripheral portion. . Therefore, in the present invention, magnesia having a large strength against tensile stress by reducing the carbon content is used.
A carbonaceous refractory is disposed on the outer periphery to prevent the occurrence of cracks on the outer periphery.
【０００８】しかも、このように外周部に強度が大きい
マグネシア−カーボン質耐火物を配置すると、内周部の
耐火物は外周部の拘束力を受けて組織が緻密化し、耐食
性の向上にさらに効果的である。Further, when the magnesia-carbon refractory having high strength is disposed on the outer periphery in this manner, the refractory on the inner periphery receives the restraining force of the outer periphery, densifying the structure and further improving the corrosion resistance. It is a target.
【０００９】例えば、上記した特開昭６２−２０２０１
６号公報には、内周部がマグネシア−カーボン質耐火
物、外周部はマグネシア質耐火物またはマグネシア−ド
ロマイト質耐火物よりなる転炉出鋼孔用スリーブ耐火物
が示されている。しかし、ここでは、外周面の摩擦抵抗
を少なくしてスリーブ耐火物が抜け落ちするのを防止す
るために、外周部には滑りの原因となるカーボンを全く
含有していない。For example, Japanese Patent Application Laid-Open No. 62-20201 described above.
No. 6 discloses a sleeve refractory for a converter tapping steel hole having an inner peripheral portion made of magnesia-carbon refractory and an outer peripheral portion made of magnesia refractory or magnesia-dolomite refractory. However, in this case, in order to reduce the frictional resistance of the outer peripheral surface and prevent the sleeve refractory from falling off, the outer peripheral portion does not contain any carbon that causes slippage.
【００１０】これに対し本発明では、カーボン含有量が
異なるが、外周部、内周部ともにマグネシア−カーボン
質耐火物である。カーボン未含有の材質は熱膨脹が大き
いので、それを外周部に配置すると内周部の熱膨脹を拘
束する本発明の効果が得られない。On the other hand, in the present invention, although the carbon content is different, both the outer peripheral portion and the inner peripheral portion are magnesia-carbon refractories. Since a material containing no carbon has a large thermal expansion, if it is arranged on the outer peripheral portion, the effect of the present invention for restraining the thermal expansion on the inner peripheral portion cannot be obtained.
【００１１】本発明で使用するマグネシアは、焼結品、
電融品、あるいはその併用でもよい。粒径は従来のマグ
ネシア−カーボン質耐火物と同様、密充填組織が得られ
るように粗粒、中粒、微粒に調整する。The magnesia used in the present invention is a sintered product,
An electrofused product or a combination thereof may be used. The particle size is adjusted to coarse, medium, and fine particles to obtain a tightly packed structure, similarly to the conventional magnesia-carbonaceous refractories.
【００１２】カーボンの具体的な種類は、りん状黒鉛、
土状黒鉛、人造黒鉛、ピッチコークス、無煙炭、カーボ
ンブラック、ピッチなどから選ばれる一種または二種以
上である。粒度は特に限定するものではないが、好まし
くは０．５ｍｍ以下とする。アルミナは、例えばＡｌ2
Ｏ3が９６ｗｔ％以上の仮焼品、電融品または焼結品を
使用する。その割合は特に限定するものではないが、例
えば外掛けで１０ｗｔ％以下、好ましくは１〜８ｗｔ％
である。１０ｗｔ％をこえると耐食性が低下し、好まし
くない。粒径は反応性を高めるために微粒が好ましく、
例えば２０μｍ以下とする。Specific types of carbon include phosphorous graphite,
One or more selected from earth graphite, artificial graphite, pitch coke, anthracite, carbon black, pitch and the like. The particle size is not particularly limited, but is preferably 0.5 mm or less. Alumina is, for example, Al 2
A calcined product, an electrofused product, or a sintered product containing 96 wt% or more of O 3 is used. The ratio is not particularly limited, but is, for example, 10 wt% or less, preferably 1 to 8 wt% in an outer case.
It is. If it exceeds 10% by weight, the corrosion resistance decreases, which is not preferable. The particle size is preferably fine to increase reactivity,
For example, it is 20 μm or less.
【００１３】カーボン含有量を内周部より外周部で少な
くする場合は、内周部のカーボンの割合を例えば５〜３
０ｗｔ％とする。内周部のカーボンの割合は、この範囲
内で、転炉の操業条件、スリーブ耐火物のサイズ、外周
部のカーボン量などに合わせて定める。内周部のカーボ
ンの割合が５ｗｔ％未満ではカーボンが持つ耐食性およ
び耐スポール性の効果が不十分となり、３０ｗｔ％を超
えると耐酸化性、耐摩耗性が低下する。When the carbon content is made smaller at the outer periphery than at the inner periphery, the ratio of carbon in the inner periphery is set to, for example, 5 to 3 times.
0 wt%. The ratio of carbon in the inner peripheral portion is determined within this range in accordance with the operating conditions of the converter, the size of the sleeve refractory, the amount of carbon in the outer peripheral portion, and the like. If the ratio of carbon in the inner peripheral portion is less than 5 wt%, the corrosion resistance and spall resistance of carbon become insufficient, and if it exceeds 30 wt%, the oxidation resistance and wear resistance decrease.
【００１４】外周部のカーボンは、熱膨脹を十分に抑制
するには、２ｗｔ％以上の含有量が必要である。また、
その強度によって内周部の熱膨脹を拘束するには、カー
ボンの含有量を内周部に比べて、例えば３ｗｔ％以上少
なくすることが好ましい。In order to sufficiently suppress the thermal expansion, the content of carbon in the outer peripheral portion needs to be 2 wt% or more. Also,
In order to restrain the thermal expansion of the inner peripheral portion by its strength, it is preferable to reduce the content of carbon by, for example, 3 wt% or more as compared with the inner peripheral portion.
【００１５】外周部、内周部を構成する本発明のマグネ
シア−カーボン質のスリーブ耐火物は、以上の配合物の
他にも、本発明の効果を損なわない範囲で、各種の金属
粉、金属酸化物、炭化物、ほう化物、窒化物、ファイバ
ー類などから選ばれる一種または二種以上を適当量添加
してもよい。金属酸化物の例としては、スピネル、クロ
ミアなどである。また、内周部だけでなく、外周部にも
アルミナを含有させてもよいが、本発明の効果を阻害し
ないために外周部のアルミナ量は含有量をごく小量に留
めなければならず、しかも内周部より少なくすることが
必要である。The magnesia-carbon sleeve refractory of the present invention, which constitutes the outer peripheral portion and the inner peripheral portion, is not limited to the above-described compounds, and may be any of various metal powders and metals within a range not to impair the effects of the present invention. An appropriate amount of one or more selected from oxides, carbides, borides, nitrides, fibers and the like may be added. Examples of metal oxides are spinel, chromia and the like. Also, not only the inner peripheral portion, but may also contain alumina in the outer peripheral portion, but the amount of alumina in the outer peripheral portion must be kept very small in order not to inhibit the effect of the present invention, In addition, it is necessary to make it smaller than the inner peripheral portion.
【００１６】スリーブ耐火物の製造方法は、以上の配合
物を混練、成形する。混練には、フェノール樹脂、フラ
ン樹脂、ピッチなどを耐火性配合物全体に対する外掛け
で２〜５ｗｔ％添加する。成形は、均質組織が得られる
ようにラバープレスの使用が好ましいが、一軸成形法で
も行うことができる。さらにラバープレスと一軸成形の
併用も可能である。In a method for producing a sleeve refractory, the above-mentioned compound is kneaded and molded. For kneading, a phenol resin, a furan resin, pitch and the like are added in an amount of 2 to 5% by weight based on the entire refractory composition. The molding is preferably performed using a rubber press so as to obtain a homogeneous structure, but can also be performed by a uniaxial molding method. Furthermore, it is also possible to use both rubber press and uniaxial molding.
【００１７】スリーブ耐火物を内外周の材質が異なる二
層構造にするためには、例えば成形型内に仕切り板を入
れ、外周部、内周部に相当する配合物を区分けして投入
し、一体的に成形する。あるいは、別々に成形した外周
部と内周部とを、接合面にモルタルなどを介して一体化
する。In order to form the sleeve refractory into a two-layer structure in which the inner and outer peripheral materials are different, for example, a partition plate is placed in a mold, and a compound corresponding to the outer peripheral portion and the inner peripheral portion is divided and charged. Molded integrally. Alternatively, the outer peripheral portion and the inner peripheral portion formed separately are integrated with the joining surface via mortar or the like.
【００１８】外周部、内周部の厚さは特に限定されるも
のではないが、各部位の効果を発揮させるためと、片方
が薄すぎると成形が容易でないなどの理由から、厚さの
比で外周部：内周部が１：９〜９：１であることが好ま
しい。The thicknesses of the outer peripheral portion and the inner peripheral portion are not particularly limited. However, the ratio of the thickness is not sufficient in order to exhibit the effect of each portion and to make molding difficult if one is too thin. Preferably, the ratio of the outer peripheral portion to the inner peripheral portion is 1: 9 to 9: 1.
【００１９】成形後は、約１００〜８００℃程度で加熱
し、結合剤を硬化させることにより、成形体の強度を付
与する。また、これを焼成品にする場合は、例えば１２
００℃以下で還元焼成する。After molding, the molded body is heated at about 100 to 800 ° C. to harden the binder, thereby imparting strength to the molded body. When this is to be a fired product, for example, 12
Reduction firing is performed at a temperature of 00 ° C. or less.
【００２０】図は、本発明の多層構造スリーブ耐火物の
断面の一例を模式的に示したものである。図において、
Ａ図は長さ方向にそった断面図、Ｂ図はＡ図のＸ−Ｘ線
断面図である。図１は、内周部（１）、外周部（２）の
それぞれの厚みが長さ方向に同じにした例である。図２
は、基端部については全体を内周部（１）と同じ材質に
した例である。スリーブの一端が炉内側に露出する転炉
では、図２の構造にすると、外周部の温度変動が小さく
なる。FIG. 1 schematically shows an example of a cross section of a multi-layered sleeve refractory of the present invention. In the figure,
FIG. A is a cross-sectional view along the length direction, and FIG. B is a cross-sectional view taken along line XX of FIG. FIG. 1 is an example in which the thickness of each of the inner peripheral portion (1) and the outer peripheral portion (2) is the same in the length direction. FIG.
Is an example in which the whole of the base end portion is made of the same material as the inner peripheral portion (1). In a converter in which one end of the sleeve is exposed inside the furnace, the structure shown in FIG. 2 reduces the temperature fluctuation of the outer peripheral portion.
【００２１】[0021]
【実施例】以下に本発明実施例とその比較例を示す。表
１は、本発明実施例、比較例およびその試験結果であ
る。Examples Examples of the present invention and comparative examples are shown below. Table 1 shows Examples of the present invention, Comparative Examples, and test results thereof.
【００２２】[0022]
【表１】 [Table 1]
【００２３】熱膨脹率；表に示す内周部の配合物、外周
部の配合物を別々に混練、成形した。混練の際には結合
剤としてフェノール樹脂を外掛け３．５ｗｔ％添加し
た。１０００／ｃｍ2の加圧力で加圧成形後、１５０℃
で加熱処理した。こうして得られた内周部、外周部のそ
れぞれの材質について、熱膨脹率を測定した。Coefficient of thermal expansion: The composition at the inner periphery and the composition at the outer periphery shown in the table were separately kneaded and molded. At the time of kneading, 3.5 wt% of a phenol resin was externally added as a binder. After pressing with 1000 / cm 2 pressure, 150 ° C
Was heated. The coefficient of thermal expansion of each of the inner and outer peripheral materials thus obtained was measured.
【００２４】この結果から、内周部の材質が、アルミナ
の含有によって熱膨脹が大きくなることが確認される。From this result, it is confirmed that the material of the inner peripheral portion has a large thermal expansion due to the inclusion of alumina.
【００２５】曲げ強さ；前記と同様にして得られた内周
部、外周部のそれぞれの材質について、１４００℃で曲
げ強さを測定した。この結果から、カーボン含有量の少
ない材質が強度が大きいことが確認される。これによ
り、外周部が内周部の熱膨脹を拘束する作用として働
く。Flexural strength: The flexural strength was measured at 1400 ° C. for each of the inner and outer peripheral materials obtained in the same manner as described above. From this result, it is confirmed that a material having a low carbon content has a high strength. Thus, the outer peripheral portion acts as an action for restraining the thermal expansion of the inner peripheral portion.
【００２６】耐亀裂性；配合物にフェノール樹脂を３．
５ｗｔ％添加して混練し、ラバープレスによって約１０
００／ｃｍ2の加圧力で内外周部を一体的に成形後、約
２００℃で加熱処理して得た内径２００×厚さ１００×
長さ１２００ｍｍのスリーブ耐火物について測定した。
実施例１〜５および比較例２〜３は内外周の材質が異な
るスリーブ耐火物であり、外周部、内周部を同間隔の厚
さに成形した。比較例１は、全体が同材質のスリーブ耐
火物である。2. Crack resistance; phenolic resin in the formulation
5 wt% added and kneaded, about 10 by rubber press
The inner and outer peripheries are integrally formed with a pressing force of 00 / cm 2 and then heat-treated at about 200 ° C. to obtain an inner diameter 200 × thickness 100 ×
The measurement was performed on a sleeve refractory having a length of 1200 mm.
Examples 1 to 5 and Comparative Examples 2 to 3 are sleeve refractories having different inner and outer peripheral materials, and the outer peripheral portion and the inner peripheral portion were formed to have the same thickness. Comparative Example 1 is a sleeve refractory made entirely of the same material.
【００２７】内周部と外周部の境界面を含む試料を内周
部が内側になり、かつ前記境界面を被熱面と平行になる
ように配置された環状組立物の内部を１６５０℃で加熱
後、空冷する操作を繰り返した後、内周部および外周部
の亀裂発生状況を、大、中、小、無しの４段階に評価し
た。実施例１〜３は内周部の亀裂発生が少なく、実施例
４〜８は内周部、外周部のいずれも亀裂発生が少ない。The sample containing the boundary between the inner and outer perimeters was heated at 1650 ° C. in an annular assembly having the inner perimeter facing inside and the boundary being parallel to the surface to be heated. After the heating and air-cooling operations were repeated, the occurrence of cracks in the inner and outer peripheral portions was evaluated in four stages: large, medium, small, and none. In Examples 1 to 3, the occurrence of cracks in the inner peripheral portion is small, and in Examples 4 to 8, both the inner peripheral portion and the outer peripheral portion are less likely to crack.
【００２８】実機試験；前記の耐亀裂性の欄で示す方法
と同様にして製造したスリーブ耐火物のうち、実施例
１、比較例１、比較例２および比較例４について、実際
に３００ｔ転炉の出鋼孔耐火物として使用し、地金浸入
状況、亀裂発生状況、解体性および耐用回数を測定し
た。地金浸入状況、亀裂発生状況は、使用後、目視によ
って大、中、小に評価した。解体性については、その所
要時間を比較し、○、△、×で示した。この結果からも
明らかなように、本発明実施例より得られたスリーブ耐
火物は、いずれも良好な耐用性および解体性が得られ
る。The physical testing; of the sleeve refractory produced in the same manner as in crack resistance of the column, the actual施例
1 , Comparative Example 1, Comparative Example 2 and Comparative Example 4 were actually used as refractory for tapping holes of a 300 t converter, and the infiltration of metal, the occurrence of cracks, the dismantling and the number of times of use were measured. The infiltration of metal and the occurrence of cracks were visually evaluated as large, medium and small after use. Regarding the disassembly, the required time was compared and indicated by ○, Δ, and ×. As is clear from these results, all of the sleeve refractories obtained from the examples of the present invention have good durability and dismantling properties.
【００２９】比較例１は、全体が同一材質のマグネシア
−カーボン質耐火物である。耐亀裂性、実機試験におい
て本発明実施例より劣る。比較例２は、内周部はマグネ
シア−カーボン質耐火物であるが、外周部はカーボンを
含まないマグネシア質であり、外周部による内周部の拘
束がないために、耐亀裂性、実機試験ともに劣る。比較
例３は外周部、内周部ともにマグネシア−カーボン質耐
火物とし、本発明とは逆に、カーボン含有量が内周部よ
り外周部を多くしたものであり、内周部の熱応力により
外周部に亀裂が発生しており、さらに外周部による内周
部に対する拘束力がないために、耐用性の向上は認めら
れなかった。比較例４は外周部、内周部ともにマグネシ
ア−カーボン質耐火物とし、さらに本発明とは逆に、外
周部、内周部ともに同量の仮焼アルミナを添加したもの
である。外周部はアルミナの添加で膨脹し、内周部の膨
脹を拘束する効果が本発明ほどには無い。そのため、実
機試験において、耐用性が本発明実施例より劣る。Comparative Example 1 is a magnesia-carbon refractory made entirely of the same material. Inferior to the examples of the present invention in crack resistance and actual machine test. In Comparative Example 2, the inner peripheral portion was a magnesia-carbonaceous refractory, but the outer peripheral portion was magnesia containing no carbon, and there was no constraint on the inner peripheral portion by the outer peripheral portion. Both are inferior. In Comparative Example 3, the outer peripheral portion and the inner peripheral portion were made of magnesia-carbon refractory, and contrary to the present invention, the carbon content was larger in the outer peripheral portion than in the inner peripheral portion. Cracks were generated in the outer peripheral portion, and there was no binding force on the inner peripheral portion by the outer peripheral portion. Therefore, improvement in durability was not recognized. In Comparative Example 4, magnesia-carbon refractories were used for both the outer and inner peripheral portions, and contrary to the present invention, the same amount of calcined alumina was added to both the outer and inner peripheral portions. The outer peripheral portion expands due to the addition of alumina, and the effect of restraining the expansion of the inner peripheral portion is not as great as that of the present invention. Therefore, in the actual machine test, the durability is inferior to the examples of the present invention.
【００３０】[0030]
【発明の効果】本発明により製造されたスリーブ耐火物
は、マグネシア−カーボン質において、内周部と外周部
が特定の材質による多層構造にしたことにより、マグネ
シア−カーボン質耐火物が本来有している耐食性および
耐スポーリング性と相俟って、転炉出鋼孔用耐火物とし
て必要な耐用性および解体性に優れた効果を発揮する。The sleeve refractory produced according to the present invention has a magnesia-carbon refractory, which has a multi-layer structure made of a specific material in the inner peripheral portion and the outer peripheral portion. Combined with the corrosion resistance and spalling resistance described above, the present invention exerts excellent effects on the durability and dismantling required for a refractory for a converter tap hole.
【図１】本発明のスリーブ耐火物の断面を模式的に示し
たものである。Ａ図は長さ方向にそった断面図、Ｂ図は
Ａ図のＸ−Ｘ線断面図である。FIG. 1 schematically shows a cross section of a sleeve refractory of the present invention. FIG. A is a cross-sectional view along the length direction, and FIG. B is a cross-sectional view taken along line XX of FIG.
【図２】本発明のスリーブ耐火物の断面を模式的に示し
たものである。Ａ図は長さ方向にそった断面図、Ｂ図は
長さ方向に対する直角断面図である。基端部全体を内周
部１材質にした例である。FIG. 2 schematically shows a cross section of the sleeve refractory of the present invention. FIG. A is a cross-sectional view along the length direction, and FIG. B is a cross-sectional view at right angles to the length direction. This is an example in which the entire base end is made of a material of an inner peripheral portion 1.
１ 内周部 ２ 外周部 1 inner circumference 2 outer circumference
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北井恒雄 兵庫県高砂市荒井町新浜１丁目３番１号 ハリマセラミック株式会社内 (72)発明者 岡本尚人 兵庫県高砂市荒井町新浜１丁目３番１号 ハリマセラミック株式会社内 (72)発明者 田中雅人 兵庫県高砂市荒井町新浜１丁目３番１号 ハリマセラミック株式会社内 (56)参考文献 特開 平４−119962（ＪＰ，Ａ) 実公 平２−428（ＪＰ，Ｙ２) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuneo Kitai 1-3-1, Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside Harima Ceramics Co., Ltd. (72) Inventor Naoto Okamoto 1-3-1, Niihama, Arai-machi, Takasago City, Hyogo Prefecture No. Harima Ceramic Co., Ltd. (72) Inventor Masato Tanaka 1-3-1 Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside Harima Ceramic Co., Ltd. (56) References JP-A-4-119962 (JP, A) -428 (JP, Y2)
Claims (1)
りなり、かつ、内周部にアルミナを含有すると共に、カ
ーボン含有量を内周部より外周部で少なくしたことを特
徴とする転炉出鋼孔用スリーブ耐火物。1. A whole magnesia - made of carbon refractories, and, together with the containing alumina in the inner peripheral portion, mosquitoes
A sleeve refractory for a steel exit hole in a converter, wherein a carbon content is smaller at an outer peripheral portion than at an inner peripheral portion .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4340467A JP2698010B2 (en) | 1992-12-21 | 1992-12-21 | Refractory sleeve for converter tap hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4340467A JP2698010B2 (en) | 1992-12-21 | 1992-12-21 | Refractory sleeve for converter tap hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06184617A JPH06184617A (en) | 1994-07-05 |
| JP2698010B2 true JP2698010B2 (en) | 1998-01-19 |
Family
ID=18337246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4340467A Expired - Fee Related JP2698010B2 (en) | 1992-12-21 | 1992-12-21 | Refractory sleeve for converter tap hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2698010B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100851482B1 (en) * | 2001-12-05 | 2008-08-08 | 주식회사 포스코 | Nozzle for converter steel tap hole |
| JP5566005B2 (en) * | 2007-11-16 | 2014-08-06 | 株式会社クボタ | melting furnace |
| JP7256063B2 (en) * | 2019-04-17 | 2023-04-11 | 黒崎播磨株式会社 | Manufacturing method of tap sleeve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02428U (en) * | 1988-06-14 | 1990-01-05 | ||
| JPH04119962A (en) * | 1990-09-06 | 1992-04-21 | Harima Ceramic Co Ltd | Magnesia-carbon refractories |
-
1992
- 1992-12-21 JP JP4340467A patent/JP2698010B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06184617A (en) | 1994-07-05 |
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