JPH0437448A - Nozzle for casting wide and thin slab - Google Patents
Nozzle for casting wide and thin slabInfo
- Publication number
- JPH0437448A JPH0437448A JP2139706A JP13970690A JPH0437448A JP H0437448 A JPH0437448 A JP H0437448A JP 2139706 A JP2139706 A JP 2139706A JP 13970690 A JP13970690 A JP 13970690A JP H0437448 A JPH0437448 A JP H0437448A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- weight
- graphite
- casting
- mesophase
- 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 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 8
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 150000001875 compounds Chemical class 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 238000004898 kneading Methods 0.000 claims abstract description 3
- 238000010304 firing Methods 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000004901 spalling Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000011819 refractory material Substances 0.000 description 5
- 239000012615 aggregate Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011300 coal pitch Substances 0.000 description 1
- 210000002808 connective tissue Anatomy 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process 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
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000011148 porous material Substances 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
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、広幅薄肉スラブ鋳造用に使用される高い熱間
強度を有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 with high hot strength used for casting wide thin-walled slabs.
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
ては特に熱間強度が高く、かつスポーリング性に優れた
材質が要求される。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 shock, so there is a risk of cracking due to these shocks. Therefore, the nozzle is required to be made of a material that has particularly high hot 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、Ａｊ！、 Ｓ
ｉ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（
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 Aj! , S
A method of adding metals such as i to develop metal-induced bonds in the firing process of refractories, and increasing the molding pressure of refractories (
However, methods have been developed to make the organization more precise.
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。弾性率の上昇
はすなわち耐ス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、耐ス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。However, if the strength is improved by this method,
There is a problem in that the elastic modulus of the material increases to the same degree as or even more than the increase in strength. An increase in elastic modulus means a decrease in spalling resistance. In a nozzle for casting wide thin-walled slabs, high strength and resistance to thermal shock are important, and sacrificing spalling resistance in order to increase strength is undesirable in actual use.
本発明はかかる課題に鑑みなされたもので、熱間強度が
高くかつスポーリング性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 excellent spalling properties.
前記課題を解決するための本発明は、メソフェイズカー
ボンを３〜１５重量％、Ａｊ？、Ｓｉの単体または化合
物を３〜１０重量％、炭化硼素を０．２〜２．０重量％
、黒鉛５〜４０重量％その他耐火性原料と結合材を混練
成形し、乾燥後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。The present invention for solving the above problems includes mesophase carbon in an amount of 3 to 15% by weight, Aj? , 3 to 10% by weight of simple substance or compound of Si, and 0.2 to 2.0% by weight of boron carbide.
This is a wide thin slab casting nozzle characterized by kneading and molding 5 to 40% by weight of graphite and other refractory raw materials and a binder, drying and firing.
まずメソフェイズカーボンであるが、石油系。 First of all, mesophase carbon is petroleum-based.
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列性をもって集合し、光学的異方性
をもった液晶を生成する。これはマイクロメソフェイズ
と呼ばれる数μｍから数ｌＯμｍ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。Alternatively, when coal-based pitch is heated, free carbon and hydrocarbons aggregate in a certain alignment, producing liquid crystals with optical anisotropy. This is a sphere with a size of several μm to several 10 μm called a micromesophase. 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、マイクロメソ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 micro-mesophase 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
ソ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。使用するメソフェイズカ
−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か合
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（１゜逆にメソフェイズの生成が不十分で
メソ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、耐火物を招請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。Mesophase carbon exhibits a strong bonding effect due to the coalescence of mesophase 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. The mesophase carbon to be used must be one 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 the sphere size is set to 50 μm or less in order to define the stage before the coalescence of the memphas progresses and the sphere size increases. If the heat treatment is excessive, the mesophase spheres will coalesce, and the bonding effect will not be fully exerted when used in refractories (1°) On the other hand, if mesophase formation is insufficient and the mesophase content is low, it is due to the pitch. The mesophase content is 50% because the volatile content increases, forming pores and weakening the structure when inviting refractories.
It is necessary that the volatile content be at least 30% by weight.
メソフェイズの使用は少量でも効果があるか、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、使用量は３〜１５重量％の範囲が適
当である。The use of mesophase may be effective even in a small amount, but if used in excess, there are problems such as the low wear resistance of carbon and its dissolution into molten steel, so the appropriate amount to use is in the range of 3 to 15% by weight.
特願平１−９０２４１号によれば、上記メソフェイズカ
ーボンの添加により高強度の浸漬ノズルを得ることが可
能とあるが、広幅薄肉スラブ鋳造用ノズルを考えた場合
、高速鋳造を行なう場合は、薄幅のスリットノズル内孔
部を多量の溶鋼が流れ、大きな内圧が発生する。この内
圧でも破壊しないノズルが必要となり、さらに高強度が
必要となる。According to Japanese Patent Application No. 1-90241, it is possible to obtain a high-strength immersion nozzle by adding the above-mentioned mesophase carbon, but when considering a nozzle for casting wide and thin slabs, when performing high-speed casting, A large amount of molten steel flows through the inner hole of the thin slit nozzle, generating a large internal pressure. A nozzle that will not break even under this internal pressure is required, and high strength is also required.
本発明者等は、強度向上の手段としてＡｌ、 Ｓｉ。The present inventors used Al and Si as a means of improving strength.
Ｂ、Ｃの添加量を種々検討した結果、ＡＮ、 Ｓｉの単
体または化合物を３〜１０重量％、炭化硼素を０．２〜
２．０重量％添加することが適当であることを知見した
。As a result of various studies on the amounts of B and C added, it was found that 3 to 10% by weight of AN or Si alone or as a compound, and 0.2 to 10% by weight of boron carbide.
It has been found that it is appropriate to add 2.0% by weight.
Ａｌ２．Ｓｉの金属類であるが、広幅薄肉スラブ鋳造用
ノズルのようなカーボン含有耐火物に添加すると、耐火
物の焼成過程において炭化物や窒化物を生成する。しか
もそれらの生成物は、耐火物の空隙に結合組織として生
成するため大きな強度を発現する。また炭化物や窒化物
による結合は、高温下でも劣化することが少なく熱間強
度を付与する上で有利である。その使用量は３重量％以
下では効果が少なく、また過剰な場合は耐スポーリング
性が低下する。使用量は３〜１０重量％か適当である。Al2. When Si metal is added to a carbon-containing refractory such as a nozzle for casting wide thin-walled slabs, it generates carbides and nitrides during the firing process of the refractory. Moreover, these products develop as connective tissue in the voids of the refractory, and therefore exhibit great strength. Further, bonding using carbides and nitrides is less likely to deteriorate even at high temperatures and is advantageous in imparting hot strength. If the amount used is less than 3% by weight, the effect will be small, and if it is in excess, the spalling resistance will decrease. The amount used is 3 to 10% by weight or appropriate.
Ｂ、Ｃについては、耐火物の焼成過程において一部が酸
化物となり、骨材との間でセラミック結合を形成し、一
部は耐火物のバインダーとの間でカーボン結合を形成す
る。特に本発明のように、金属と組み合わせた場合は、
骨材、金属、パインダ−の間で強固な結合を形成する。Regarding B and C, part of them becomes oxides during the firing process of the refractory and forms a ceramic bond with the aggregate, and a part of them forms a carbon bond with the binder of the refractory. Especially when combined with metal as in the present invention,
Forms a strong bond between aggregate, metal and binder.
しかし過剰な場合はＢ２Ｏ３を多く生成し、膏剤と反応
して低融物を形成するために熱間強度が低下する。使用
量は０．２〜２．０重量％が適当である。However, if it is in excess, a large amount of B2O3 is produced, which reacts with the plaster to form a low-melting substance, resulting in a decrease in hot strength. The appropriate amount used is 0.2 to 2.0% by weight.
黒鉛としては、天然の鱗状黒鉛、土状黒鉛、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、耐ス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。As graphite, natural graphite scales, earthy graphite, artificial graphite obtained by heat treating coke, etc. can be used.
Scale graphite is desirable from the viewpoint of corrosion resistance and spalling resistance. If the graphite content is less than 5% by weight, the slag resistance of graphite will not be exhibited, and if it is more than 40% by weight, high strength will not be obtained and the resistance to molten steel will deteriorate.
本発明を実施例に基づいて説明する。 The present invention will be explained based on examples.
表１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練し、成形用配合物を調整した。The blended refractory raw materials shown in Table 1 were kneaded with a phenol resin as a binder to prepare a molding compound.
アイソスタチックプレス→乾燥→焼成工程を経て、広幅
薄肉スラブ鋳造用ノズルを得た。A nozzle for casting wide thin-walled slabs was obtained through an isostatic press → drying → firing process.
実施例１〜４は金属類８重量％、炭化硼素０．５重量％
で、メソフェイズカーボンを３〜１５重量％としている
。いずれも高い熱間強度を示し、一方、弾性率の向上は
抑制されており、耐スポーリング性が良好である実施例
５．６では炭化硼素の量を増やしている。熱間強度が次
第に低下する一方、弾性率が高くなる。Examples 1 to 4 contain 8% by weight of metals and 0.5% by weight of boron carbide.
The mesophase carbon content is 3 to 15% by weight. All of them show high hot strength, while the improvement in elastic modulus is suppressed, and in Examples 5 and 6, which have good spalling resistance, the amount of boron carbide is increased. While the hot strength gradually decreases, the elastic modulus increases.
炭化硼素の量が本請求範囲を超えた比較例１では、弾性
率が高く、熱間強度が大幅に低下する。In Comparative Example 1 in which the amount of boron carbide exceeds the claimed range, the elastic modulus is high and the hot strength is significantly reduced.
同様に比較例２〜６では弾性率が高（、熱間強度が低く
、実施例に比較して劣っている。Similarly, Comparative Examples 2 to 6 have high elastic modulus (low hot strength) and are inferior to Examples.
以上説明したごとく本発明による鋳造用ノズルは、従来
のノズルに比して熱間強度および弾性率共に優れており
、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 has superior hot strength and elastic modulus compared to conventional nozzles, and can be exposed to high-temperature molten steel and even exposed to mechanical or thermal shocks such as internal and external pressure of molten steel. As a nozzle for casting wide, thin-walled slabs that are subjected to high temperatures, it is highly durable and can exhibit excellent performance.
代理人 弁理士 秋 沢 政 光 他１名Agent Patent Attorney Masaaki Akizawa 1 other person
Claims (1)
の単体または化合物を３〜１０重量％，炭化硼素を０．
２〜２．０重量％，黒鉛５〜４０重量％その他耐火性原
料と結合材を混練成形し、乾燥後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。3-15% by weight of mesophase carbon, Al, Si
3 to 10% by weight of a single substance or compound of , and 0.0% of boron carbide.
A nozzle for casting a wide thin slab, characterized in that it is made by kneading and molding 2 to 2.0% by weight of graphite, 5 to 40% by weight of graphite, other refractory raw materials, and a binder, drying and firing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2139706A JPH0437448A (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 |
|---|---|---|---|
| JP2139706A JPH0437448A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0437448A true JPH0437448A (en) | 1992-02-07 |
Family
ID=15251526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2139706A Pending JPH0437448A (en) | 1990-05-31 | 1990-05-31 | Nozzle for casting wide and thin slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0437448A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9616200B2 (en) | 2005-12-21 | 2017-04-11 | Venetc International, Inc. | Intravenous catheter anchoring device |
| US9974929B2 (en) | 2008-06-30 | 2018-05-22 | Venetec International, Inc. | Anchoring system for a medical article |
| US10322262B2 (en) | 2009-05-21 | 2019-06-18 | C. R. Bard, Inc. | Medical device securement system |
| US10537714B2 (en) | 2009-11-11 | 2020-01-21 | Venetec International, Inc. | Stabilizing device for an extension set |
| US10561815B2 (en) | 2005-08-31 | 2020-02-18 | C. R. Bard, Inc. | Anchoring system for a catheter |
| US10729887B2 (en) | 2013-03-15 | 2020-08-04 | C. R. Bard, Inc. | Securement device having an integral strap and dressing |
-
1990
- 1990-05-31 JP JP2139706A patent/JPH0437448A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10561815B2 (en) | 2005-08-31 | 2020-02-18 | C. R. Bard, Inc. | Anchoring system for a catheter |
| US11813407B2 (en) | 2005-08-31 | 2023-11-14 | C. R. Bard, Inc. | Anchoring system for a catheter |
| US9616200B2 (en) | 2005-12-21 | 2017-04-11 | Venetc International, Inc. | Intravenous catheter anchoring device |
| US9974929B2 (en) | 2008-06-30 | 2018-05-22 | Venetec International, Inc. | Anchoring system for a medical article |
| US10322262B2 (en) | 2009-05-21 | 2019-06-18 | C. R. Bard, Inc. | Medical device securement system |
| US10537714B2 (en) | 2009-11-11 | 2020-01-21 | Venetec International, Inc. | Stabilizing device for an extension set |
| US10729887B2 (en) | 2013-03-15 | 2020-08-04 | C. R. Bard, Inc. | Securement device having an integral strap and dressing |
| US11478616B2 (en) | 2013-03-15 | 2022-10-25 | C. R. Bard, Inc. | Securement device having an integral strap and dressing |
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