JPH02263758A - Production of upper nozzle for casting molten steel - Google Patents
Production of upper nozzle for casting molten steelInfo
- Publication number
- JPH02263758A JPH02263758A JP63153777A JP15377788A JPH02263758A JP H02263758 A JPH02263758 A JP H02263758A JP 63153777 A JP63153777 A JP 63153777A JP 15377788 A JP15377788 A JP 15377788A JP H02263758 A JPH02263758 A JP H02263758A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- magnesia
- upper nozzle
- zirconia powder
- molten 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000843 powder Substances 0.000 claims abstract description 58
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 57
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 23
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 21
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000004898 kneading Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 14
- 238000005260 corrosion Methods 0.000 abstract description 13
- 230000007797 corrosion Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004901 spalling Methods 0.000 abstract description 5
- 239000000377 silicon dioxide Substances 0.000 abstract description 4
- 238000001354 calcination Methods 0.000 abstract description 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 6
- 239000005350 fused silica glass Substances 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000013003 hot bending Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- -1 respectively Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、取鍋・タンプッシュなどに取付けられる溶鋼
鋳造用上ノズルの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing an upper nozzle for casting molten steel that is attached to a ladle, tumble pusher, or the like.
（従来の技術）
前記した上ノズルの従来材質は、例えば昭和５４年５月
１５日・耐火物技術協会「耐火物とその応用」第３８１
ページ第７行に記載されているように、高アルミナ質が
主流となっている。(Prior art) The conventional materials for the upper nozzle mentioned above are described, for example, in Refractory Technology Association "Refractories and Their Applications" No. 381, May 15, 1970.
As stated in line 7 of the page, high alumina materials are the mainstream.
また、ポーラス質の鋳造用ノズルとして特開昭６０−５
１６しかし、高アルミナ質は耐スポーリング性に優れる
反面、耐食性に劣り、その耐用寿命は十分とはいえない
。Also, as a nozzle for porous casting, JP-A-60-5
16 However, although high alumina has excellent spalling resistance, it has poor corrosion resistance and its service life is not sufficient.
一方、球状マグネシアを主骨材にしたものは、ポーラス
質としてのガス透過性の機能に優れているが、溶鋼が侵
入しやすく耐食性に劣る。On the other hand, those made of spherical magnesia as the main aggregate have excellent gas permeability as a porous material, but are easily penetrated by molten steel and have poor corrosion resistance.
また、上ノズルは通常の鋳造用ノズルと異なり、ストッ
パーとの組み合わせで使用されることがあり、その場合
は、ストッパーヘッドの（り返しの押圧で上端の損傷が
著しく、ストッパーを閉じても湯漏れを起こすという問
題があった。In addition, the upper nozzle is different from a normal casting nozzle and is sometimes used in combination with a stopper. There was a problem with leaks.
（課題を解決するための手段）
本発明者は、溶鋼鋳造用上ノズルがもつ前記の問題を解
決するために研究を重ねた。その結果、非球状マグネシ
ア粉とジルコニア粉とを特定の割合で配合して製造した
材質が上ノズルとして良好な結果を示すことを知り、本
発明を完成するに至ったものである。(Means for Solving the Problems) The present inventor has conducted repeated research in order to solve the above-mentioned problems of the upper nozzle for casting molten steel. As a result, it was found that a material manufactured by blending non-spherical magnesia powder and zirconia powder in a specific ratio showed good results as an upper nozzle, and this led to the completion of the present invention.
本発明は、ジルコニア粉をジルコン粉に置き換えても同
様の効果が得られる。また、上記の配合物に、シリカ質
原料を添加してもよい、シリカ質原料の添加は、耐スポ
ール性を向上させる効果がある。In the present invention, similar effects can be obtained even if zirconia powder is replaced with zircon powder. Further, a siliceous raw material may be added to the above-mentioned formulation.Addition of a siliceous raw material has the effect of improving spall resistance.
以下、本発明をさらに詳しく説明する。なお、以下に示
す％は、すべて重量％とする。The present invention will be explained in more detail below. Note that all percentages shown below are percentages by weight.
まず、主骨材となる非球状マグネシア粉は、焼結晶。First, the non-spherical magnesia powder that is the main aggregate is baked crystal.
電融品のいずれでもよい、非球状にするためには、ショ
ークラッシャー、フレットミルなどを用いて破砕すれば
よい０粒子径は、主骨材としての役割を付与するために
、例えば最大粒子径を５〜１＋＋ｓ程度し、粗粒、中粒
、微粒に調整する。Any type of electro-fused product may be used. To make it non-spherical, it may be crushed using a show crusher, fret mill, etc. The zero particle size is the maximum particle size, for example, in order to serve as the main aggregate. for about 5 to 1++ seconds and adjust to coarse, medium, or fine particles.
ジルコニア粉、ジルコン粉の粒子径は、例えば１ｍ以下
とする。好ましい平均粒子径は３００ａｍ以下である。The particle size of the zirconia powder and zircon powder is, for example, 1 m or less. The preferred average particle diameter is 300 am or less.
粒子径が小さいため、粒形状による効果上の差がないこ
とから、破砕粉１球状品のいずれでもよい０粒子径が１
国を超えると主骨材の非球状マグネシア粉との反応性が
小さく、上ノズルの耐ポーリング性付与の効果に劣る。Since the particle size is small, there is no difference in effectiveness depending on the particle shape.
If it exceeds the country, the reactivity with the non-spherical magnesia powder, which is the main aggregate, will be small, and the effect of imparting anti-polling properties to the upper nozzle will be poor.
各配合物の割合は、非球状マグネシア粉が７０％未満で
ジルコニア粉又はジルコン粉が３０％を超えると耐食性
に劣る。逆に非球状マグネシア粉が９９％を超えジルコ
ニア粉又はジルコン粉が１％未満では、耐スポーリング
性に劣る。さらに好ましい範囲は、それぞれ、非球状マ
グネシア粉子５〜９５％。ジルコニア粉又はジルコン粉
５〜２５％である。ジルコニア粉とジルコニア粉とを併
用してもよいが、その含量を１〜３０％の範囲内にとど
める。If the ratio of each compound is less than 70% non-spherical magnesia powder and more than 30% zirconia powder or zircon powder, the corrosion resistance will be poor. On the other hand, if the non-spherical magnesia powder exceeds 99% and the zirconia powder or zircon powder accounts for less than 1%, the spalling resistance is poor. A more preferable range is 5 to 95% of non-spherical magnesia powder. Zirconia powder or zircon powder is 5 to 25%. Although zirconia powder and zirconia powder may be used together, the content should be kept within the range of 1 to 30%.
シリカ質原料粉は、溶融シリカ、シリカガラス、ムライ
ト、長石、けい石、けい砂９石英などから選ばれる一種
又は二種以上である。純度の面から、中でも溶融シリカ
が好ましい０粒子径は、特に限定するものではないが、
例えば３圓以下とする。粒子形状は、球状、非球状を問
わない。The siliceous raw material powder is one or more selected from fused silica, silica glass, mullite, feldspar, silica, silica sand, 9-quartz, and the like. From the viewpoint of purity, the particle size of 0, which is preferably fused silica, is not particularly limited, but
For example, it is 3 circles or less. The particle shape may be spherical or non-spherical.
シリカ質原料の割合は、前記した非球状マグネシア粉と
、ジルコニア粉又はジルコン粉とからなる配合物１００
％に対し、Ｓｉｎ、換算で２０％以下とする。好ましく
は１〜１０％である。比較的少ない割合でも効果がある
が、２０％を超えるとＳｉｎ、成分による低融点物質の
生成過多となって、耐食性を低下させる。The ratio of the siliceous raw material is 100% of the mixture consisting of the above-mentioned non-spherical magnesia powder and zirconia powder or zircon powder.
%, Sin, converted to 20% or less. Preferably it is 1 to 10%. Although a relatively small proportion is effective, if it exceeds 20%, excessive production of low melting point substances due to Sin and other components will occur, resulting in a decrease in corrosion resistance.
本発明は、以上の配合物に無機質又は有機質の結合剤を
適量添加して混練し、後は常法どおり、成形、焼成して
ｆ！１ｓｆｉＡ鋳造用上ノズルを製造する。焼成温度は
、例えば１４００〜１８００″Ｃとする。In the present invention, an appropriate amount of an inorganic or organic binder is added to the above-mentioned mixture, the mixture is kneaded, and then molded and baked in a conventional manner. 1sfiA upper nozzle for casting is manufactured. The firing temperature is, for example, 1400 to 1800''C.
（作 用）
第１図、第２図のグラフは、マグネシア−ジルコン質お
よびマグネシア−ジルコニア質の耐火物において、それ
ぞれジルコン、ジルコニアの含有量を変化させ、マグネ
シア粉が非球状品と球状品との違いによる耐食性、熱間
曲げ強さの関係を示したものである。(Function) The graphs in Figures 1 and 2 show that the contents of zircon and zirconia are changed in magnesia-zircon and magnesia-zirconia refractories, respectively, and magnesia powder is used for non-spherical and spherical refractories. This figure shows the relationship between corrosion resistance and hot bending strength due to differences in .
破砕によって耐火物原料の粒度を調整することは従来か
ら行われている。そして、破砕品の粒形は、非球状であ
る。しかし、マグネシア−ジルコニア質あるいはマグネ
シア−ジルコン質ではマグネシアを非球状で使用すると
、第１．２図のグラフに示すように、従来の球状マグネ
シア粉使用品に比べて耐食性および熱間強度が格段に向
上する。その理由の詳細は明らかではないが、マグネシ
ア粉の粒形が非球状、すなわち角ぼっていることでジル
コニア粉あるいはジルコン粉との反応が促進され、粒界
がその両者の固溶体で埋められ、組織を強固に一体化す
るとともに、溶鋼の侵入を阻止しているためと思われる
。It has been conventional practice to adjust the particle size of refractory raw materials by crushing. The particle shape of the crushed product is non-spherical. However, in the case of magnesia-zirconia or magnesia-zircon, when magnesia is used in a non-spherical form, as shown in the graph in Figure 1.2, the corrosion resistance and hot strength are significantly higher than that of conventional products using spherical magnesia powder. improves. Although the details of the reason are not clear, the grain shape of magnesia powder is non-spherical, that is, angular, which promotes the reaction with zirconia powder or zircon powder, and the grain boundaries are filled with a solid solution of both powders, resulting in a structure This seems to be due to the fact that it is strongly integrated and prevents the intrusion of molten steel.
したがって、固溶体を形成し難いもの、ある＾）は固溶
体を形成してもそれが耐食性および熱間強度の付与に劣
る場合は、本発明のような効果が得られない０例えば、
後述の第２表比較例７のとおり、マグネシア−シリカ質
（Ｓｉｆｔ成分５％含有）の材質は、ジルコニア粉ある
いはジルコン粉の添加がないため、マグネシア粉を非球
状品としたにもかかわらず、耐食性、熱間強度ともに劣
っている。Therefore, for some materials that are difficult to form a solid solution, even if a solid solution is formed, if it is inferior in imparting corrosion resistance and hot strength, the effects of the present invention cannot be obtained.For example,
As shown in Comparative Example 7 in Table 2 below, the magnesia-silica material (containing 5% Sift component) does not contain zirconia powder or zircon powder, so even though the magnesia powder is made into a non-spherical product, Both corrosion resistance and hot strength are poor.
本発明はさらに、前記したマグネシア−ジルコニア質ま
たはマグネシア−ジルコン質にシリカ質原料を特定の割
合で添加すると、耐久ポーリング性が向上する。第３図
は１ｍｍ以下の溶融シリカ粉をシリカ質原料とし、５ｉ
Ｏ１換算によるシリカ質原料の添加割合と、耐スポーリ
ング性の関係を示したものである。Further, in the present invention, when a siliceous raw material is added to the magnesia-zirconia or magnesia-zircon in a specific proportion, the durable poling property is improved. Figure 3 shows fused silica powder of 1 mm or less as a siliceous raw material,
This figure shows the relationship between the addition ratio of siliceous raw materials in terms of O1 and spalling resistance.
なお、上記第１〜３図のグラフに示す試験結果は、後述
する実施例で示した各試験方法と同様にして測定した。The test results shown in the graphs of FIGS. 1 to 3 above were measured in the same manner as the test methods shown in Examples described later.
（実施例） 以下に、本発明実施例およびその比較例を示す。(Example) Examples of the present invention and comparative examples thereof are shown below.
第１表は、各側で使用した耐火物原料の化学成分である
。第２表、第３表は、各側とそれにより得られた上ノズ
ルの試験結果である。Table 1 is the chemical composition of the refractory raw materials used on each side. Tables 2 and 3 show the test results for each side and the resulting upper nozzle.
第１表において、球状マグネシアは、破砕によって平均
粒子径１００μｍ以下にしたマグネシア微粉を回転皿形
造粒機で球状化し、ついで１８００°Ｃで焼成したもの
である。In Table 1, spherical magnesia is obtained by spheroidizing fine magnesia powder that has been crushed to an average particle size of 100 μm or less using a rotating plate granulator, and then calcining it at 1800°C.
非球状マグネシア、アルミナジルコニア、ジルコン、溶
融シリカおよびムライトは、市販品より得られたものを
破砕し、粒度を調整したものである。Non-spherical magnesia, alumina zirconia, zircon, fused silica, and mullite were obtained by crushing commercially available products and adjusting the particle size.
第２表、第３表に示す各側は、いずれも配合物全体に対
し外掛けで粘土２％、粉末フェノール樹脂１％、および
液状フェノール樹脂３％を結合剤として添加し、混練後
、フレクションプレスにて外径２４０×内径８０×高さ
３００閤の上ノズル形状に成形し、乾燥後、１６５０℃
で焼成し、上ノズルを得たものである。For each side shown in Tables 2 and 3, 2% clay, 1% powdered phenolic resin, and 3% liquid phenolic resin were added as binders to the entire mixture, and after kneading, the flange was mixed. Formed into a nozzle shape with an outer diameter of 240 x inner diameter of 80 x height of 300 using a compression press, and dried at 1650°C.
The upper nozzle was obtained by firing the upper nozzle.
なお、上ノズルに不活性ガス吹込みの機能をもたせる場
合は、骨材の粒度、加圧成形時の圧力などを調整すれば
よい。In addition, when the upper nozzle is provided with an inert gas blowing function, the particle size of the aggregate, the pressure during pressure molding, etc. may be adjusted.
（効 果）
以上のように、本発明によれば耐食性および熱間強度に
優れた溶鋼鋳造用上ノズルを得ることができる。(Effects) As described above, according to the present invention, an upper nozzle for casting molten steel having excellent corrosion resistance and hot strength can be obtained.
上ノズルは通常の鋳造ノズルと違って、上端が溶鋼容器
内に露出しているために、溶鋼流による侵食作用を受け
やすい、また、ストッパーとの組合せ使用ではストッパ
ーヘッドの押圧を受ける０本発明による上ノズルは、こ
のような苛酷な使用条件に対応することができ、取鍋。Unlike ordinary casting nozzles, the upper end of the upper nozzle is exposed in the molten steel container, so it is susceptible to erosion by the molten steel flow, and when used in combination with a stopper, it is subject to pressure from the stopper head. Due to the upper nozzle, the ladle can cope with such harsh usage conditions.
タンデシシュなど溶鋼容器の安定操業を可能にすると共
に、高耐食による鋼のクリーンスチール化に大きく貢献
する。In addition to enabling stable operation of molten steel containers such as tandeshish, it will greatly contribute to the development of clean steel through its high corrosion resistance.
第
図
／Ｑ
−〇
ぐＱ
！Ｏ
ジルコニア粉またはジルコン粉の割合（重量％）第
図
非球状マグネシア−ジルコニア貿
ジルコニア粉またはジルコン粉の割合（重量％）手
Ｍこ
ネ甫
正
書
（方式）
％式％
事件の表示
昭和６３年特許願第１５３７７７号
２、ｌ＠明の名称
溶鋼鋳造用上ノズルの製造方法
３、補正をする者
事件との関係 特許出願人
に
／、ｆ−
λト
ＳｉＯヨ成分の割合
（重量％）
４、補正命令の日付 平成１年１２月２６日（発進口）
６、補正の内容
明、ｔ’ｓ書第１０頁最下行の「配合組成中、（）内の
数値は外掛けの割合を示す。」の後に、次の文を加入す
る。Figure/Q-〇guQ! O Proportion of zirconia powder or zircon powder (weight %) Chart Non-spherical magnesia-zirconia trade Proportion of zirconia powder or zircon powder (weight %) Te M Kone Fu Seisho (method) % formula % Indication of the incident 1986 Patent Application No. 153777 2, 1@Ming name Manufacturing method of upper nozzle for casting molten steel 3, Relationship with the person making the amendment case To the patent applicant/, Ratio of f-λ and SiO components (wt%) 4 , Date of amendment order December 26, 1999 (starting gate)
6. In the description of the amendment, the following sentence will be added to the bottom line of page 10 of the T'S book after "In the composition, the numbers in parentheses indicate the ratio of external multiplication."
「"
第１図は、ジルコニア粉またはジルコン粉を添加した場
合の、マグネシア−ジルコン質耐火物の耐食性と熱間曲
げ強さの関係を示すグラフ。
第２図は、ジルコニア粉またはジルコン粉を添加した場
合の、マグネシア−ジルコニア質耐大物の耐食性と熱間
曲げ強さの関係を示すグラフ。
第３図は、Ｓｉｎ、成分の添加割合と耐スポーリング性
との関係を示すグラフ。FIG. 1 is a graph showing the relationship between corrosion resistance and hot bending strength of magnesia-zircon refractories when zirconia powder or zircon powder is added. FIG. 2 is a graph showing the relationship between corrosion resistance and hot bending strength of magnesia-zirconia large-sized materials when zirconia powder or zircon powder is added. FIG. 3 is a graph showing the relationship between the addition ratio of Sin and components and spalling resistance.
Claims (4)
ルコニア粉１〜３０％からなる配合物を混練，成形後、
焼成する溶鋼鋳造用上ノズルの製造方法。(1) After kneading and molding a compound consisting of 70-99% non-spherical magnesia and 1-30% zirconia powder by weight,
A method for manufacturing an upper nozzle for casting molten steel to be fired.
溶鋼鋳造用上ノズルの製造方法。(2) The method for manufacturing an upper nozzle for casting molten steel according to claim 1, wherein the zirconia powder is zircon powder.
ジルコニア粉１〜３０％からなる配合物１００％に対し
、さらにシリカ質原料粉をＳｉＯ＿２換算で２０％以下
添加し、混練，成形後、焼成する溶鋼鋳造用上ノズルの
製造方法。(3) Add 20% or less of siliceous raw material powder in terms of SiO_2 to 100% of the mixture consisting of 70-99% of non-spherical magnesia powder and 1-30% of zirconia powder by weight, and after kneading and molding. , a method for manufacturing an upper nozzle for casting molten steel to be fired.
溶鋼鋳造用上ノズルの製造方法。(4) The method for manufacturing an upper nozzle for casting molten steel according to claim 3, wherein the zirconia powder is zircon powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63153777A JPH02263758A (en) | 1988-06-21 | 1988-06-21 | Production of upper nozzle for casting molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63153777A JPH02263758A (en) | 1988-06-21 | 1988-06-21 | Production of upper nozzle for casting molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02263758A true JPH02263758A (en) | 1990-10-26 |
Family
ID=15569911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63153777A Pending JPH02263758A (en) | 1988-06-21 | 1988-06-21 | Production of upper nozzle for casting molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02263758A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6172673A (en) * | 1984-09-13 | 1986-04-14 | 東芝セラミツクス株式会社 | Manufacture of ceramic sintered body |
| JPS6360151A (en) * | 1986-06-16 | 1988-03-16 | ハリマセラミック株式会社 | Thermal shock-resistant magnesia-zirconia base refractory brick |
-
1988
- 1988-06-21 JP JP63153777A patent/JPH02263758A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6172673A (en) * | 1984-09-13 | 1986-04-14 | 東芝セラミツクス株式会社 | Manufacture of ceramic sintered body |
| JPS6360151A (en) * | 1986-06-16 | 1988-03-16 | ハリマセラミック株式会社 | Thermal shock-resistant magnesia-zirconia base refractory brick |
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