JPH01127156A - Nozzle for continuous casting - Google Patents
Nozzle for continuous castingInfo
- Publication number
- JPH01127156A JPH01127156A JP28625787A JP28625787A JPH01127156A JP H01127156 A JPH01127156 A JP H01127156A JP 28625787 A JP28625787 A JP 28625787A JP 28625787 A JP28625787 A JP 28625787A JP H01127156 A JPH01127156 A JP H01127156A
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- molten steel
- nozzle
- passage hole
- continuous casting
- 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
- 238000009749 continuous casting Methods 0.000 title claims description 19
- 229910052582 BN Inorganic materials 0.000 claims abstract description 10
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000010304 firing Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000004898 kneading Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 25
- 239000010959 steel Substances 0.000 abstract description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 14
- 239000002245 particle Substances 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 8
- 239000004570 mortar (masonry) Substances 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000005011 phenolic resin Substances 0.000 abstract description 3
- 239000011261 inert gas Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011294 coal tar pitch Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 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 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000010112 shell-mould casting Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Ceramic Products (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）
この発明は、溶鋼などの連続鋳造操業で、取鍋からタン
デイツシュ或いはタンデイツシュから鋳型へと溶鋼など
を鋳入する連続鋳造用ノズルに関し、その溶鋼などの通
過する通過孔の壁面における溶鋼中のアルミナ粒子など
からなる夾雑物の付着防止に係るものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a continuous casting nozzle for pouring molten steel from a ladle to a tundish or from a tundish to a mold in a continuous casting operation for molten steel. This relates to the prevention of adhesion of contaminants such as alumina particles in molten steel on the walls of passage holes through which steel passes.
（従来の技術）
元来、溶鋼、例えばアルミキルド鋼を連続鋳造する際に
鋼中に発生したアルミナ粒子など夾雑物が連続鋳造用ノ
ズルの溶鋼通過孔壁面に付着し、やがては内孔径をせば
め、極端には完全に詰まり、正常な連続鋳造作業に支障
をきたすという問題がしばしばあった。(Prior art) Originally, when molten steel, for example aluminium-killed steel, was continuously cast, impurities such as alumina particles generated in the steel adhered to the wall surface of the molten steel passage hole of the continuous casting nozzle, and eventually narrowed the inner hole diameter. In extreme cases, the problem often occurred that it became completely clogged, interfering with normal continuous casting operations.
そこでこれに対して従来は連続鋳造用ノズルの溶鋼通過
孔内壁に多孔質部を設け、そこから外部より導入したア
ルゴンガスや窒業ガスなどの不活性ガスを溶鋼通過孔内
に吹き込んで前記夾雑物の付着を防止していた。To solve this problem, conventionally, a porous part is provided on the inner wall of the molten steel passage hole of a continuous casting nozzle, and an inert gas such as argon gas or nitrous gas introduced from the outside is blown into the molten steel passage hole. It prevents things from sticking.
ところが、この方法をもってしても連続鋳造用ノズルの
内壁のすべてにわたって不活性ガスを均一に吹き込むこ
とは構造的に不可能であった。However, even with this method, it is structurally impossible to uniformly blow inert gas over the entire inner wall of the continuous casting nozzle.
また鋼種によっては、この不活性ガスが鋼片中での気泡
発生の原因ともなり、適用できないという制約など新た
な問題があった。さらにはこの不活性ガスの吹き込みに
は、当然ながら付属の配管装置や不活性ガス化などに要
する諸費用も決して少なくないものであった。In addition, depending on the type of steel, this inert gas may cause bubbles to form in the steel slab, creating new problems such as the restriction that it cannot be applied. Furthermore, injecting this inert gas naturally requires a considerable amount of expense for the accompanying piping equipment and inert gasification.
そこでこの不活性ガスを使うことのない方法で。So here's a method that doesn't use inert gas.
連ｈｔｔａ造用ノズルの材質面で改善、改良し、前記の
溶鋼中のアルミナ粒子などの付着防止を目的としたもの
の一つとして特開昭５６−１３９２６０号公報に開示さ
れる技術が提案されている。A technique disclosed in JP-A-56-139260 has been proposed as one of the methods aimed at improving and improving the material of the nozzle for continuous steel production and preventing the adhesion of alumina particles in the molten steel. There is.
この従来技術は鋳造用ノズルの内管表層部３〜１５ｍの
厚さに、重量比で窒化硼素５〜８０％。In this conventional technology, boron nitride is added in a weight ratio of 5 to 80% to a thickness of 3 to 15 m on the surface layer of the inner tube of a casting nozzle.
残部を黒鉛、アルミナ、ムライト、ジルコニア、ジルコ
ン、シリカ、金属珪素、炭化珪素の１種または２種以上
からなる配合物を配設せしめ、ラバープレスにて成形し
、焼成してなるところの鋳造用ノズルである。For casting, the balance is formed by disposing a compound consisting of one or more of graphite, alumina, mullite, zirconia, zircon, silica, metallic silicon, and silicon carbide, molding with a rubber press, and firing. It's a nozzle.
（発明が解決しようとする問題点）
ところでこの材質の改善による提案では、窒化硼素５〜
８０％の他、黒鉛、アルミナなどの耐火材が２０〜９５
％添加されたものであるため、これらの黒鉛以下の添加
物が溶鋼による選択溶損を起こし、やがて溶鋼通過孔の
表面性状があらくなる６そしてこの表面状態に溶鋼中の
アルミナ粒子などが付着しやすくなり、結局は溶鋼通過
孔の閉塞に至り、付着防止効果は、鋳造作業の初期の段
階において、幾分みられる程度で連続鋳造の多数回繰返
し使用には不充分であった。(Problem to be solved by the invention) By the way, in this proposal for improving the material, boron nitride 5~
In addition to 80%, refractory materials such as graphite and alumina account for 20 to 95%.
%, these additives below graphite cause selective erosion by the molten steel, and eventually the surface texture of the molten steel passage hole becomes rough6.Then, alumina particles in the molten steel adhere to this surface condition. The adhesion prevention effect was only slightly visible in the early stages of casting work, and was insufficient for repeated use many times in continuous casting.
また前述の窒化硼素と耐火材とからなる材質が本体材質
内の一部を形成してラバープレスで一体成形する方法の
ため、焼成収縮率が異るため、切れが生じやすく製造歩
留りが低いものとならざるを得なかった。In addition, since the material made of boron nitride and refractory material mentioned above forms part of the main body material and is integrally molded with a rubber press, the firing shrinkage rate is different, so it is easy to break and the manufacturing yield is low. I had no choice but to do so.
この発明は、従前のような不活性ガスの吹き込みをする
ことなく、連続鋳造用ノズルの溶湯通過孔に、アルミナ
付着のし難い材質からなる。あらかじめ成形された筒状
体を挿入固定し、従来の問題点を解決する連続鋳造用ノ
ズルの提供を目的とするものである。In this invention, the molten metal passage hole of the continuous casting nozzle is made of a material that is difficult to adhere to alumina without blowing inert gas as in the conventional method. The object of the present invention is to provide a continuous casting nozzle in which a pre-formed cylindrical body is inserted and fixed, and which solves the conventional problems.
（問題点を解決するための手段）
この目的を達成するために、この発明は、次のような構
成としている。(Means for Solving the Problems) In order to achieve this object, the present invention has the following configuration.
すなわち、この発明に係る連続鋳造用ノズルは、その溶
鋼通過孔内に、窒化硼素粉末にフェノールレジンやフラ
ンレジン或いはコールタールピッチなどの還元焼成で炭
素を残留する有機質バインダーを添加したものを混練、
成形して次いで還元性雰囲気で焼成したその成分がＢＮ
；７０〜９８重量％、Ｃ；２〜３０重量％からなる筒状
体を挿入固定してなることを特徴とするものである。That is, the continuous casting nozzle according to the present invention kneads boron nitride powder with an organic binder that leaves carbon after reduction firing, such as phenol resin, furan resin, or coal tar pitch, in the molten steel passage hole.
The component that is molded and then fired in a reducing atmosphere is BN.
; 70 to 98% by weight; C; 2 to 30% by weight; is inserted and fixed therein.
この発明は、溶鋼中のアルミナ粒子などに対してきわめ
て濡れ難い性質をもつ窒化硼素を利用したものである。This invention utilizes boron nitride, which has a property of being extremely difficult to wet with alumina particles in molten steel.
なお窒化硼素のみの粉末からなるきわめて高価なホット
プレス製焼結体とは異なり、有機質バインダーの添加に
よって混線、その後−殻内な加圧成形によった筒状体を
還元雰囲気で焼成して炭素を残留させたものである。Note that unlike the extremely expensive hot-pressed sintered body made of boron nitride powder, the carbon is mixed by adding an organic binder, and then the cylindrical body is pressure-formed inside the shell and fired in a reducing atmosphere. remains.
なお有機質バインダーの添加量は、還元焼成した後のＣ
成分が２〜３０％が望ましく、筒状体の形状に係わる成
形性を考慮して適宜選択される。The amount of organic binder added is C after reduction firing.
The content of the component is preferably 2 to 30%, and is appropriately selected in consideration of moldability related to the shape of the cylindrical body.
この場合、２％未満では成形が困難であり、また３０部
超ではＢＮ成分が相対的に少なくなり、初期の付着防止
性という目的を達成しない。In this case, if it is less than 2%, it will be difficult to mold, and if it exceeds 30 parts, the BN component will be relatively small, and the objective of the initial adhesion prevention property will not be achieved.
この発明連続鋳造用ノズルは、このあらかじめ別途に製
造された筒状体を溶鋼通過孔に挿入、耐火モルタルなど
を利用して固定したものである。In the continuous casting nozzle of the present invention, this separately manufactured cylindrical body is inserted into a molten steel passage hole and fixed using refractory mortar or the like.
実施例
粒径５〜０．５ミクロンの窒化硼素粉末１００部に水２
部を分割で加え、自動乳鉢で２０分間混合し、良く湿ら
せる。そして次に粘度１０ボイズ液状フエノールレジン
を分割で１５部加えて自動乳鉢で１時間混練する。Example: 100 parts of boron nitride powder with a particle size of 5 to 0.5 microns and 2 parts of water.
Add in portions and mix in an automatic mortar for 20 minutes to moisten well. Next, 15 parts of liquid phenol resin with a viscosity of 10 voids was added in portions and kneaded in an automatic mortar for 1 hour.
この混線物を６０℃で２時間放置して揮発分の調整を行
なう。This mixture was left at 60° C. for 2 hours to adjust the volatile content.
そして金型を用いて上下方向より静圧加重をかけて成形
する。成形圧力は筒所面積に対して１ｔ／ｄで行った。Then, using a mold, static pressure is applied from above and below to form the product. The molding pressure was 1 t/d relative to the cylinder area.
この成形した筒状体をコークスプリーズ中に埋めて電気
炉を用い８００℃で６時間焼成する。焼成後、連続鋳造
用ノズルの内孔面に４４μ以下のアルミナ微粉と水ガラ
ス系バインダーで練った耐火モルタルを目地剤として目
地０．５〜１．０ｍの間に充填して固定して製品が得ら
れる。This molded cylindrical body is buried in coke pleat and fired at 800° C. for 6 hours using an electric furnace. After firing, the inner hole surface of the continuous casting nozzle is filled with refractory mortar made of fine alumina powder of 44μ or less and a water glass binder as a joint between 0.5 and 1.0 m, and the product is fixed. can get.
ちなみに、この筒状体を挿入した連続鋳造用ノズルをア
ルミキルド鋼２５０ｔを５チヤ一ジ２４０分鋳造に供し
たところ、アルミナ粒子の付着層はまったくみられず、
２ｍｍ程度の溶損を認めるだけであった。この条件で従
来のアルミナ−黒鉛−シリカの材質からなる連続鋳造用
ノズルの溶鋼通過孔には最大１５＋ｍ厚のアルミナ粒子
などの付着層が形成されていた。By the way, when a continuous casting nozzle with this cylindrical body inserted was used to cast 250 tons of aluminum killed steel in 5 batches for 240 minutes, no adhering layer of alumina particles was observed.
Only about 2 mm of melt damage was observed. Under these conditions, an adhering layer of alumina particles and the like having a maximum thickness of 15+ m was formed in the molten steel passage hole of the conventional continuous casting nozzle made of alumina-graphite-silica material.
（発明の効果）
この発明は、アルミナ粒子などを付着させ難い窒化硼素
を用い有機質バインダーの添加によって、−殻内な成形
手段で容易に成形ができる筒状体を挿入固定する連続鋳
造用ノズルで構成されているため、連続鋳造の多数回使
用においても、溶鋼通過孔へのアルミナ粒子などの付着
、それによる閉塞が防遮できると共に従来の二層一体成
形の連続鋳造用ノズルと比べてきわめて生産性が良い。(Effects of the Invention) This invention provides a continuous casting nozzle that inserts and fixes a cylindrical body that can be easily molded by an in-shell molding method by using boron nitride, which is difficult to attach alumina particles to, and adding an organic binder. Because of this structure, it is possible to prevent alumina particles from adhering to the molten steel passage hole and blockage caused by it even when continuous casting is used multiple times, and it is extremely productive compared to conventional two-layer integrally molded continuous casting nozzles. Good sex.
また溶鋼通過孔の任意の部所に適用が可能である。Moreover, it can be applied to any part of the molten steel passage hole.
Claims (1)
、成形して次いで還元性雰囲気で焼成した成分がＢＮ；
７０〜９８重量％、Ｃ；２〜３０重量％からなる筒状体
を、溶湯通過孔に挿入、固定したことを特徴とする連続
鋳造用ノズル。The component obtained by kneading and molding boron nitride powder with an organic binder added and then firing in a reducing atmosphere is BN;
A continuous casting nozzle characterized in that a cylindrical body consisting of 70 to 98% by weight and C: 2 to 30% by weight is inserted and fixed into a molten metal passage hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28625787A JPH01127156A (en) | 1987-11-12 | 1987-11-12 | Nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28625787A JPH01127156A (en) | 1987-11-12 | 1987-11-12 | Nozzle for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01127156A true JPH01127156A (en) | 1989-05-19 |
Family
ID=17702026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28625787A Pending JPH01127156A (en) | 1987-11-12 | 1987-11-12 | Nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01127156A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991017008A1 (en) * | 1990-05-08 | 1991-11-14 | Shinagawa Refractories Co., Ltd | Multi-stepped immersion nozzle for continuous casting |
| EP0826447A1 (en) * | 1996-08-26 | 1998-03-04 | Shinagawa Refractories Co., Ltd. | Nozzle for continuous casting |
-
1987
- 1987-11-12 JP JP28625787A patent/JPH01127156A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991017008A1 (en) * | 1990-05-08 | 1991-11-14 | Shinagawa Refractories Co., Ltd | Multi-stepped immersion nozzle for continuous casting |
| AU649042B2 (en) * | 1990-05-08 | 1994-05-12 | Shinagawa Refractories Co., Ltd. | Multi-stepped immersion nozzle for continuous casting througha tundish |
| EP0826447A1 (en) * | 1996-08-26 | 1998-03-04 | Shinagawa Refractories Co., Ltd. | Nozzle for continuous casting |
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