JPH0437453A - Nozzle for casting wide and thin slab - Google Patents
Nozzle for casting wide and thin slabInfo
- Publication number
- JPH0437453A JPH0437453A JP2139709A JP13970990A JPH0437453A JP H0437453 A JPH0437453 A JP H0437453A JP 2139709 A JP2139709 A JP 2139709A JP 13970990 A JP13970990 A JP 13970990A JP H0437453 A JPH0437453 A JP H0437453A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- nozzle
- strength
- particle diameter
- cao
- 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
- 238000005266 casting Methods 0.000 title claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 16
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 12
- 239000010439 graphite Substances 0.000 claims abstract description 12
- DJOYTAUERRJRAT-UHFFFAOYSA-N 2-(n-methyl-4-nitroanilino)acetonitrile Chemical compound N#CCN(C)C1=CC=C([N+]([O-])=O)C=C1 DJOYTAUERRJRAT-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- 239000010431 corundum Substances 0.000 claims abstract description 5
- 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 claims abstract description 5
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 5
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 3
- 238000010304 firing Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- -1 baddellite Inorganic materials 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 238000004901 spalling Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000004898 kneading Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000377 silicon dioxide Substances 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
- 230000000694 effects Effects 0.000 description 10
- 230000007423 decrease Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011300 coal pitch Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000011301 petroleum pitch Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野〕
本発明は、広幅スラブ鋳造用に使用される高い熱間強度
を有し、また析出するアルミナ付着を防止する鋳造用ノ
ズルに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a casting nozzle used for wide slab casting that has high hot strength and prevents alumina deposition.
［従来の技術］
広幅薄肉スラブ鋳造用に使用される鋳造用ノズルは、構
造が複雑なうえにノズル全体が高温の溶鋼に曝され、ま
たたえず機械的あるいは熱的衝撃をうけるので、これら
衝撃により割れが生ずる恐れがあるために、ノズルとし
ては特に熱的強度が高く、かつスポーリング性に優れた
材質が要求される。[Prior Art] Casting nozzles used for casting wide, thin-walled slabs have a complex structure, and the entire nozzle is exposed to high-temperature molten steel and is constantly subjected to mechanical or thermal shocks. Because of the risk of cracking, the nozzle is required to be made of a material that has particularly high thermal strength and excellent spalling properties.
機械的強度を向上するための手段としては、結合剤とし
て使用する樹脂を多量に添加する方法、粒径の小さい超
微分骨材を添加し組織を緻密にする方法、ＡＥ、Ｓｉな
どの金属を添加し、耐火物の焼成過程において金属起因
の結合を発達させる方法、耐火物の成形圧力を高くし、
組織を緻密にする方法などが開発されている。Methods for improving mechanical strength include adding a large amount of resin used as a binder, adding ultra-differential aggregate with small particle size to make the structure dense, and adding metals such as AE and Si. A method of adding metal to develop metal-based bonds in the firing process of refractories, increasing the molding pressure of refractories,
Methods for making the organization more precise are being developed.
さらに浸漬ノズルにおいて、溶鋼中から析出してくるＡ
ｌ２１ｔｓ等の酸化生成物の付着によるノズル孔閉塞が
耐用性のネックになっており、従来はアルゴンガス等の
ガスを吹き込む方法や、又ＣａＯで安定化したジルコニ
アおよびカルシウムジルコネートと黒鉛からなる円筒形
のノズルが開発されている。Furthermore, in the immersion nozzle, A precipitated from the molten steel.
Nozzle hole clogging due to adhesion of oxidation products such as l21ts is a bottleneck in durability, and conventional methods have been to blow gas such as argon gas, or to use cylinders made of zirconia stabilized with CaO, calcium zirconate, and graphite. A shaped nozzle has been developed.
［発明が解決しようとする課題］
しかし、このような方法により強度を向上させた場合、
材質の弾性率が強度の向上と同じ程度、あるいはそれ以
上に上昇してしまう問題点があげられる０弾性率の上昇
はすなわち耐久ポーリング性の低下を意味する。広幅薄
肉スラブ鋳造用ノズルにおいては、高い強度と共に熱衝
撃に対する抵抗性が重要であり、強度を高くしたいがゆ
えに、耐久ポーリング性を犠牲にすることは、実際の使
用上好ましくない。[Problem to be solved by the invention] However, when the strength is improved by such a method,
There is a problem in that the elastic modulus of the material increases to the same extent as or more than the improvement in strength.An increase in the zero elastic modulus means a decrease in durable poling property. In a nozzle for casting wide, thin-walled slabs, high strength and resistance to thermal shock are important, and sacrificing durable poling properties in order to increase strength is undesirable in actual use.
またＡ！２０Ｂの付着を防止する方法においても、アル
ゴンガスの吹き込みではアルミナ付着物を完全に除去す
るまでには至っておらず、前記したノズルにおいても機
械的強度が低く、広幅薄肉スラブ鋳造用には使用できな
い。A again! Even in the method of preventing the adhesion of 20B, blowing argon gas has not been able to completely remove the alumina adhesion, and the above-mentioned nozzle also has low mechanical strength and cannot be used for casting wide thin-walled slabs. .
Ａβ２０３付着防止にすぐれたＣａＯで安定化したジル
コニアおよびカルシウムジルコネートと黒鉛からなる円
筒形のノズルを広幅薄肉スラブ鋳造用ノズルに適用する
ために、従来の方法で強度を向上させると材質の弾性率
が強度の上昇と同じ程度、あるいはそれ以上に上昇して
しまい、耐久ポーリング性が低下する。広幅薄肉スラブ
鋳造用ノズルにおいては高い強度と共に、耐スポーリン
グ性が必要である。In order to apply a cylindrical nozzle made of CaO-stabilized zirconia and calcium zirconate and graphite, which are excellent in preventing Aβ203 adhesion, to a nozzle for casting wide thin-walled slabs, the elastic modulus of the material can be improved by improving the strength using conventional methods. increases to the same extent as or more than the increase in strength, and the durable pollability decreases. A nozzle for casting wide thin slabs requires high strength and spalling resistance.
本発明はかかる課題に鑑みなされたもので、熱間強度が
高く、かつアルミナ等の付着防止に優れた広幅薄肉スラ
ブ鋳造用ノズルを提供する。The present invention has been made in view of these problems, and provides a nozzle for casting wide thin-walled slabs that has high hot strength and is excellent in preventing adhesion of alumina and the like.
［課題を解決するための手段］
前記課題を解決するための本発明は、ＣａＯで安定化し
たジルコニアおよびカルシウムジルコネートの１種また
は２種を３０〜７０重量％、粒子直径が５０μｍ以下で
あり鉱物相がムライト、バデライト、コランダムよりな
り、 ＡβｔＯｓ２５〜８５重量％、 Ｚｒ（ｂｌ Ｏ
〜７０重量％、 Ｓｉ０．５〜２５重量％の化学組成を
有する耐火性原料（以下ＺＲＭと略する）を５〜３０重
量％、粒子直径が５０ＬＬｍ以下であるメソフェイズカ
ーボンを３〜１５重量％、金属シリコンを３〜１０重量
％、黒鉛５〜４０％を含有する配合物を結合材を用いて
混練成形し、乾燥後非酸化性雰囲気で焼成してなること
を特徴とする広幅薄肉スラブ鋳造用ノズルである。[Means for Solving the Problems] The present invention for solving the problems described above uses 30 to 70% by weight of one or both of CaO-stabilized zirconia and calcium zirconate, and the particle diameter is 50 μm or less. The mineral phase consists of mullite, baddellite, and corundum, and contains 25 to 85% by weight of AβtOs, Zr(blO
-70% by weight, 5-30% by weight of a refractory raw material (hereinafter abbreviated as ZRM) having a chemical composition of 0.5-25% by weight of Si, and 3-15% by weight of mesophase carbon with a particle diameter of 50LLm or less. , wide thin slab casting characterized by kneading and molding a compound containing 3 to 10% by weight of metallic silicon and 5 to 40% of graphite using a binder, drying and firing in a non-oxidizing atmosphere. This is a nozzle for
［作 用］
本発明においては、Ａｇ、ｌＯ，の付着防止と、強度向
上のためにＣａＯで安定化したジルコニアおよびカルシ
ウムジルコネートの１種または２種を３０〜７０重量％
含有する６３０重量％未満では付着防止効果が十分でな
く、また７０重量％を超えると黒鉛やメソフェイズカー
ボンの含有量が少なくなるために、耐スポーリング性が
低下する。[Function] In the present invention, 30 to 70% by weight of one or two of zirconia and calcium zirconate stabilized with CaO is used to prevent adhesion of Ag, IO, and to improve strength.
If the content is less than 630% by weight, the adhesion prevention effect will not be sufficient, and if it exceeds 70% by weight, the content of graphite and mesophase carbon will decrease, resulting in a decrease in spalling resistance.
なお粒子直径は８０μｍ以下が好ましい。Note that the particle diameter is preferably 80 μm or less.
つぎに粒子直径が５０ｕｍ以下であり、主たる鉱物相が
ムライト、バデライト、コランダムよりなり、Ａｌ２２
０．２５〜８５重量％、 Ｚｒ０ｉ１０〜７０重量％，
ＳｉＯ２５重量％の化学組成を有するＺＲＭを２０〜８
０重量％含有する。この原料は常温から１０００℃まで
の熱膨脹係数が７ Ｘ １０−’／”Ｃ，１０００〜１
６００℃の熱膨脹係数が２〜４ Ｘ １０−’／℃であ
り、特に高温での熱膨脹が小さく、耐久ポーリング性に
優れる。ＺｒＬの含有量が１００重量％未満は、ムライ
トまたはコランダム結晶内部または周辺に析出するジル
コニアの量が少なく耐食性に劣り、７０重量％を越える
とＺｒＯ□が単斜晶系で存在するため、異常膨張があら
れれ、耐久ポーリング性が劣る。Next, the particle diameter is 50 um or less, the main mineral phase consists of mullite, baddellite, and corundum, and Al22
0.25-85% by weight, ZrOi 10-70% by weight,
ZRM with a chemical composition of 25% by weight of SiO
Contains 0% by weight. The coefficient of thermal expansion of this raw material from room temperature to 1000℃ is 7 x 10-'/”C, 1000~1
The coefficient of thermal expansion at 600° C. is 2 to 4 × 10 −′/° C., and the thermal expansion is particularly small at high temperatures, and the durable poling property is excellent. If the ZrL content is less than 100% by weight, the amount of zirconia precipitated inside or around the mullite or corundum crystal is small, resulting in poor corrosion resistance, and if it exceeds 70% by weight, ZrO□ exists in a monoclinic system, resulting in abnormal expansion. There is a hailstorm, and the durability of polling is poor.
配合原料中のこのＺＲＭの含有率は、５〜３０重量％に
規定される。５重量％未満では充分な効果が得られず、
３０重量％を超えるとＣａＯ安定化ジルコニアやカルシ
ウムジルコネート中のＣａＯと反応し、低融物を生成す
るために強度が低下する。また粒度は、粒子直径を５０
μｍ以下とすることにより非常に高い強度が得られる。The content of this ZRM in the blended raw materials is defined as 5 to 30% by weight. If it is less than 5% by weight, sufficient effects cannot be obtained;
When it exceeds 30% by weight, it reacts with CaO in CaO-stabilized zirconia and calcium zirconate to produce a low-melting substance, resulting in a decrease in strength. In addition, the particle size is determined by measuring the particle diameter by 50
Very high strength can be obtained by setting the thickness to .mu.m or less.
つぎにメソフェイズカーボンであるが、石油系、または
石炭系のピッチを加熱すると、フリーカーボンや炭化水
素類がある配合性をもって集合し、光学的異方性をもっ
た液晶を生成する。これはマイクロメンフェイズと呼ば
れる数μｍから数１０μｍの大きさの球体である。これ
をさらに加熱すると微小な球体が合体し、バルクメソフ
ェイズと呼ばれる塊を形成する。さらにバルクメソフェ
イズは炭化してコークスになるわけであるが、本発明者
らは、マイクロメソフェイズがバルクメソフェイズに合
体する過程で強い結合作用を発現することに注目し、こ
れを耐火物の強度付与剤として使用する試みを行った。Next, regarding mesophase carbon, when petroleum-based or coal-based pitch is heated, free carbon and hydrocarbons aggregate with a certain blending property, producing a liquid crystal with optical anisotropy. This is a sphere with a size of several micrometers to several tens of micrometers, which is called a micromembrane phase. When this is further heated, the microscopic spheres coalesce to form a mass called bulk mesophase. Furthermore, bulk mesophase is carbonized and becomes coke, and the present inventors focused on the fact that a strong bonding effect is developed during the process of micromesophase coalescing into bulk mesophase. An attempt was made to use it as a strength imparting agent.
その結果、マイクロメンフェイズは強度向上に効果があ
ると同時に、弾性率の上昇を抑制することに耐スポーリ
ング性の低下を防止することが可能であることを知見し
た。As a result, it was found that Micromenphase is effective in improving strength, and at the same time, it is possible to prevent a decrease in spalling resistance by suppressing an increase in elastic modulus.
メソフェイズカーボンは、耐火物焼成時の加熱によりメ
ンフェイズ球体の合体作用、軟化溶融による空隙充填作
用により強い結合効果を発現し、強固なカーボン結合を
形成する。このカーボン結合は、ピッチ由来のソフトカ
ーボン結合であり、弾性率の上昇が少なく、耐スポーリ
ング性の向上に効果的である。Mesophase carbon exhibits a strong bonding effect due to the coalescence of memphas spheres and the void filling effect due to softening and melting due to heating during firing of refractories, forming strong carbon bonds. This carbon bond is a pitch-derived soft carbon bond, which causes little increase in elastic modulus and is effective in improving spalling resistance.
使用するメソフェイズカーボンは、加熱により合体しバ
ルクメソフェイズになる前の段階のものを使用する必要
がある。このために熱処理温度は３００〜５００℃であ
ることが必要であり、またメンフェイズの合体が進行し
て球体サイズが大きくなる前の段階を規定するために、
球体サイズは５０μｍ以下とした。熱処理が過度になる
とメソフェイズ球体が合体してしまい、耐火物に使用す
る段階で結合作用が十分に発揮されない。It is necessary to use mesophase carbon that has not yet coalesced into bulk mesophase by heating. For this purpose, the heat treatment temperature needs to be 300 to 500°C, and in order to define the stage before the coalescence of the memphas progresses and the sphere size increases,
The sphere size was 50 μm or less. If the heat treatment is excessive, the mesophase spheres will coalesce, and the binding effect will not be sufficiently exerted when used in refractories.
逆にメンフェイズの生成が不十分でメンフェイズ含有量
が少ない場合はピッチに起因する揮発分が増加し、耐火
物を焼成する際に気孔を形成し、組織を脆弱化してしま
うため、メソフェイズ含有量は５０重量％以上、揮発分
は３０重量％以下であることが必要である。On the other hand, if the memphis content is insufficient due to insufficient mesophasing, the volatile content due to pitch will increase, forming pores when firing the refractory and weakening the structure. The amount needs to be 50% by weight or more, and the volatile content needs to be 30% by weight or less.
この強度向上の効果があり、弾性率の上昇を抑制する作
用のあるメソフェイズカーボンは、３重量％未満では充
分な効果が得られず、また過剰に使用するとカーボン本
来の耐摩耗性の低さ、溶鋼への溶解などの問題があり、
また１５重量％を越えると強度が低下するので、使用量
は３〜１５重量％とし、また粒子直径を５０μｍ以下と
した。Mesophase carbon, which has the effect of improving strength and suppressing the increase in elastic modulus, does not have a sufficient effect when used in less than 3% by weight, and if used in excess, carbon's inherent low wear resistance may be reduced. , there are problems such as dissolution into molten steel,
Moreover, if the amount exceeds 15% by weight, the strength decreases, so the amount used is 3 to 15% by weight, and the particle diameter is 50 μm or less.
また強度向上を目的として、金属シリコンを３〜１０重
量％含有する。３％未満では効果が少なく、１０％以上
では耐スポーリング性が低下する。Further, for the purpose of improving strength, it contains 3 to 10% by weight of metallic silicon. If it is less than 3%, the effect will be small, and if it is more than 10%, the spalling resistance will decrease.
黒鉛としては、天然の鱗状黒鉛、生状黒鉛。Graphite includes natural scaly graphite and raw graphite.
コークスなどを熱処理して得られた人造黒鉛が使用可能
であるが、耐食性、耐久ポーリング性の観点から鱗状黒
鉛が望ましい、黒鉛が５重量％以下では黒鉛の耐スラグ
性が発揮されず、また４０重量％以上では高い強度が得
られず、耐溶鋼性も悪くなる。Artificial graphite obtained by heat treating coke or the like can be used, but flaky graphite is preferable from the viewpoint of corrosion resistance and durable poling.If the graphite content is less than 5% by weight, the slag resistance of graphite will not be exhibited; If it exceeds % by weight, high strength cannot be obtained and the resistance to molten steel deteriorates.
なお其の他配合する骨材としては、強度向上のために最
大粒子直径を５０μｍにおさえることが好ましい。In addition, it is preferable that the maximum particle diameter of the aggregate to be mixed is kept to 50 μm in order to improve the strength.
［実施例］ 本発明を実施例に基づいて説明する。[Example] The present invention will be explained based on examples.
表１〜表３に示した配合耐火物原料に、バインダーとし
てフェノール樹脂を用いて混線し、成形後還元焼成して
広幅薄肉スラブ鋳造用ノズルを得た。なお表１は主にＣ
ａＯ、ＺｒＯ，の粒子直径および金属シリコン量の変化
、表２はＺＲＭの添加量の変化、表３はメソフェイズカ
ーボン量の変化に基づく強さ等の特性を試験した結果を
示している。The blended refractory raw materials shown in Tables 1 to 3 were mixed using a phenol resin as a binder, and after molding, reduction firing was performed to obtain a nozzle for casting a wide thin slab. Note that Table 1 mainly shows C.
Table 2 shows the results of testing properties such as strength based on changes in the particle diameter of aO and ZrO and the amount of metal silicon; Table 2 shows changes in the amount of ZRM added; Table 3 shows the results of testing properties such as strength based on changes in the amount of mesophase carbon.
表
（重量％）
表
（重量％）
表１〜３においてＮｏ、 １〜３．８〜１１．１５〜１
９は実施例、勤、４〜７，１２〜１４．２０〜２２は比
較例である。Table (weight%) Table (weight%) No in Tables 1 to 3, 1 to 3.8 to 11.15 to 1
9 is an example, 4 to 7, 12 to 14, and 20 to 22 are comparative examples.
実施例Ｎｏ、１．２はＣａＯ・ＺｒＯ□（カルシウムジ
ルコネート）の最大粒子直径を８０μｍ、５０μｍとし
たものであり、強度が高く、しかも耐スポーリング性が
良好である。またＮｏ、３は金属シリコンを１０重量％
添加したものであり、さらに高強度である。比較例Ｎｏ
、４．５は上記カルシウムジルコネートの最大粒子直径
が大きく、強度が低い、比較例Ｎｏ、６は金属シリコン
量が本請求範囲より少なく、強度が低い、また比較例Ｎ
ｏ、７は本請求範囲を超えており、強度は高いが耐久ポ
ーリング性が劣っている。In Example No. 1.2, the maximum particle diameters of CaO.ZrO□ (calcium zirconate) were set to 80 μm and 50 μm, and the strength was high and the spalling resistance was good. Also, No. 3 contains 10% by weight of metal silicon.
It has even higher strength. Comparative example No.
, 4.5 has a large maximum particle diameter of the calcium zirconate and has low strength, Comparative Example No. 6 has a lower amount of metal silicon than the claimed range and has low strength, and Comparative Example N
No. 7 exceeds the scope of this claim, and although the strength is high, the durable poling property is poor.
実施例Ｎｏ、４〜７はＺＲＭの量を５〜３０重量％まで
変化させたものであり、高強度かつ耐スポーリング性に
優れている。これに対して比較倒動１２．１３はＺＲＭ
の量が本請求範囲より少なく、耐スポーリング性が劣り
、また比較例Ｎｏ、 １４はＺＲＭの量が本請求範囲を
超えており、強度が低い。In Examples Nos. 4 to 7, the amount of ZRM was varied from 5 to 30% by weight, and they had high strength and excellent spalling resistance. On the other hand, the comparative fall 12.13 is ZRM
In Comparative Example No. 14, the amount of ZRM exceeds the claimed range and the strength is low.
実施例Ｎｏ、 １５〜１７はメソフェイズカーボン量を
３〜１５重量％まで変化させたもの、実施例１８．１９
はそれぞれＣａＯ安定化Ｚｒ０２ｊ！よびｃａｏ・Ｚｒ
０− （カルシウムジルコネート）を単独に使用したも
のであり、何れも高強度かっ耐スポーリング性に優れて
いる。比較例Ｎｏ、２０．２１はメソフェイズカーボン
量が本請求範囲より少なく、耐スポーリング性が劣り、
また比較的２２はメソフェイズカーボン量が本請求範囲
を超えており、強度が低い。Examples Nos. 15 to 17 are those in which the amount of mesophase carbon is changed from 3 to 15% by weight, and Example 18.19
are respectively CaO-stabilized Zr02j! and cao・Zr
0- (calcium zirconate) is used alone, and both have high strength and excellent spalling resistance. Comparative example No. 20.21 has a lower amount of mesophase carbon than the claimed range, and has poor spalling resistance.
Comparatively, No. 22 has a mesophase carbon content exceeding the claimed range and has low strength.
以上説明したごとく本発明による鋳造用ノズルは、ノズ
ル孔閉塞などの原因となる酸化生成物の付着を、ＣａＯ
で安定化したシルコニ乙カルシウムジルコネートを含有
させることによって付着を防止し、かつ従来のノズルに
比して熱間強度が高く、また弾性率、耐久ポーリング性
に優れており、高温の溶鋼に曝され、さらには溶鋼の内
外圧など機械的あるいは熱的衝撃をうける広幅薄肉スラ
ブ鋳造用ノズルとして耐孔閉塞性、耐久力に富み、優れ
た性能を発揮し得る。As explained above, the casting nozzle according to the present invention prevents the adhesion of oxidation products such as CaO
It prevents adhesion by containing silconi-calcium zirconate stabilized with silconium zirconate, and has higher hot strength than conventional nozzles, as well as excellent elastic modulus and durable poling properties. Moreover, it is highly resistant to hole clogging and has excellent durability as a nozzle for casting wide, thin-walled slabs that are subjected to mechanical or thermal shocks such as internal and external pressures of molten steel.
Claims (1)
コネートの１種または２種を３０〜７０重量％、粒子直
径が５０μｍ以下であり鉱物相がムライト，バデライト
，コランダムよりなり、Ａｌ＿２Ｏ＿３２５〜８５重量
％，ＺｒＯ＿２１０〜７０重量％，ＳｉＯ＿２５〜２５
重量％の化学組成を有する耐火性原料を５〜３０重量％
、粒子直径が５０μｍ以下であるメソフェイズカーボン
を３〜１５重量％、金属シリコンを３〜１０重量％、黒
鉛５〜４０％を含有する配合物を結合材を用いて混練成
形し、乾燥後非酸化性雰囲気で焼成してなることを特徴
とする広幅薄肉スラブ鋳造用ノズル。30-70% by weight of one or two of zirconia and calcium zirconate stabilized with CaO, particle diameter is 50 μm or less, mineral phase consists of mullite, baddellite, corundum, Al_2O_325-85% by weight, ZrO_210-70 Weight%, SiO_25~25
5-30% by weight of refractory raw materials with a chemical composition of 5% to 30% by weight
A mixture containing 3 to 15% by weight of mesophase carbon with a particle diameter of 50 μm or less, 3 to 10% by weight of metallic silicon, and 5 to 40% of graphite is kneaded and molded using a binder, and after drying, it is A nozzle for casting wide, thin-walled slabs that is produced by firing in an oxidizing atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2139709A JPH0437453A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2139709A JPH0437453A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0437453A true JPH0437453A (en) | 1992-02-07 |
Family
ID=15251595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2139709A Pending JPH0437453A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0437453A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05269560A (en) * | 1992-03-24 | 1993-10-19 | Shinagawa Refract Co Ltd | Mold additive for continuously casting steel and continuously casting method |
| JPH07187755A (en) * | 1993-10-23 | 1995-07-25 | Veitsch Radex Ag Fuer Feuerfeste Erzeugnisse | Refractory ceramic molding compound |
| JPH09500331A (en) * | 1992-12-28 | 1997-01-14 | オーマット リミテッド | CNC machine tool controller |
| KR100774918B1 (en) * | 2006-12-14 | 2007-11-09 | 조선내화 주식회사 | Refractories for continuos casting |
-
1990
- 1990-05-31 JP JP2139709A patent/JPH0437453A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05269560A (en) * | 1992-03-24 | 1993-10-19 | Shinagawa Refract Co Ltd | Mold additive for continuously casting steel and continuously casting method |
| JPH09500331A (en) * | 1992-12-28 | 1997-01-14 | オーマット リミテッド | CNC machine tool controller |
| JPH07187755A (en) * | 1993-10-23 | 1995-07-25 | Veitsch Radex Ag Fuer Feuerfeste Erzeugnisse | Refractory ceramic molding compound |
| KR100774918B1 (en) * | 2006-12-14 | 2007-11-09 | 조선내화 주식회사 | Refractories for continuos casting |
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