JPH11188463A - Immersion nozzle for continuous casting - Google Patents
Immersion nozzle for continuous castingInfo
- Publication number
- JPH11188463A JPH11188463A JP9358469A JP35846997A JPH11188463A JP H11188463 A JPH11188463 A JP H11188463A JP 9358469 A JP9358469 A JP 9358469A JP 35846997 A JP35846997 A JP 35846997A JP H11188463 A JPH11188463 A JP H11188463A
- Authority
- JP
- Japan
- Prior art keywords
- zcg
- lining
- immersion nozzle
- length
- discharge hole
- 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
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- Compositions Of Oxide Ceramics (AREA)
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼の連続鋳造にお
いてタンディッシュからモールドへの溶融金属の注入に
使用する連続鋳造用浸漬ノズルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting immersion nozzle used for pouring molten metal from a tundish into a mold in continuous casting of steel.
【０００２】[0002]
【従来の技術】近年、鋼の連続鋳造においては鋼材品質
の厳格化に伴い浸漬ノズルの内孔に付着するアルミナ等
の非金属介在物を減少させることに多くの努力が払われ
ている。長時間の鋳造においてはアルミナ等の付着によ
り内孔が閉塞して鋳造が困難になるなど生産性向上にも
障害となるからである。2. Description of the Related Art In recent years, in continuous casting of steel, much effort has been made to reduce nonmetallic inclusions such as alumina adhering to the inner hole of an immersion nozzle in accordance with stricter steel quality. This is because in long-time casting, the adhesion of alumina or the like blocks the inner hole and makes casting difficult, which also hinders improvement in productivity.
【０００３】アルミナの付着を防止するための手法の一
つとして浸漬ノズル等の内面からアルゴンガスを溶鋼中
に吹き込む物理的な手法がある。しかし、この方法はア
ルゴンガスの吹き込み量が多すぎると気泡が鋳片内に取
り込まれてピンホールとなり欠陥発生の原因となるため
にガスの吹き込み量に制約を受け、有効な対策とはなり
得ない。As one of the methods for preventing the adhesion of alumina, there is a physical method of blowing argon gas into molten steel from the inner surface of a dipping nozzle or the like. However, this method can be an effective countermeasure because if the amount of argon gas blown is too large, bubbles will be taken into the slab and become pinholes and cause defects, which limits the amount of gas blown. Absent.
【０００４】また、他の手法として、耐火材自身にアル
ミナ付着防止機能を持たせることも行われており、その
ための代表的な耐火材として、特開昭62-288161号公報
に記載されているように、ＣａＺｒＯ3を主成分とした
ＣａＯ−ＺｒＯ2クリンカーを使用したＺｒＯ2−ＣａＯ
−黒鉛材質（以下ＺＣＧ材質と称する）がある。As another method, a refractory material itself is provided with a function of preventing adhesion of alumina. A typical refractory material for this purpose is described in Japanese Patent Application Laid-Open No. 62-288161. As described above, ZrO 2 —CaO using CaO—ZrO 2 clinker containing CaZrO 3 as a main component
-There is a graphite material (hereinafter referred to as a ZCG material).
【０００５】このＺＣＧ材質は高価であってその使用に
はコスト的に問題があり、そのため、アルミナの付着の
程度によって、浸漬ノズルにおけるＺＣＧ材質の内張り
量を変化させている。図２から図４にその態様を示す。
図２は内孔面８のみに内張りした例を示し、図３は内孔
面８に限らず吐出孔の内面９にも内張りした例を示し、
図４は浸漬部１１全体をＺＣＧ材によって製造した例を
示す。[0005] The ZCG material is expensive and its use has a problem in terms of cost. Therefore, the lining amount of the ZCG material in the immersion nozzle is changed depending on the degree of adhesion of alumina. 2 to 4 show the mode.
2 shows an example in which only the inner surface 8 is lined, and FIG. 3 shows an example in which not only the inner surface 8 but also the inner surface 9 of the discharge hole.
FIG. 4 shows an example in which the entire immersion part 11 is manufactured from a ZCG material.
【０００６】図２に示すように内孔面８のみに内張りす
る場合は、コスト的に最も有利ではあるが、吐出孔の内
面へのアルミナの付着には対応できない。また、図３の
ように、吐出孔の内面９にも内張りされている場合に
は、吐出孔から放出された溶鋼流の一部がモールドで反
転して巻き込んだモールドパウダーが浸漬ノズルの浸漬
部分の外表面７に到達し、浸漬部の本体材質であるＡｌ
2Ｏ3−Ｃ質またはＡｌ2Ｏ3−ＳｉＯ2−Ｃ質とＺＣＧ材
質との境界で低融点物を生成するためこの材質境界が著
しく溶損し、激しい場合には、吐出孔の折損を引き起こ
すなどのトラブルにつながる。これに対して、図４のよ
うに浸漬部全体をＺＣＧ材質とする場合には境界溶損を
防止することが可能であるが高価なＺＣＧ材質を多量に
使用するためさらにコストの高騰は避けられない。As shown in FIG. 2, the case of lining only the inner hole surface 8 is the most advantageous in terms of cost, but cannot cope with the adhesion of alumina to the inner surface of the discharge hole. In addition, as shown in FIG. 3, when the inner surface 9 of the discharge hole is also lined, the mold powder in which a part of the molten steel flow discharged from the discharge hole is reversed by the mold and rolled in is used as the immersion portion of the immersion nozzle. Reaches the outer surface 7 of Al
A low melting point material is generated at the boundary between the 2 O 3 -C material or Al 2 O 3 -SiO 2 -C material and the ZCG material, and this material boundary is remarkably melted. If the material boundary is severe, breakage of the discharge hole is caused. It leads to troubles such as. On the other hand, when the entire immersion portion is made of ZCG material as shown in FIG. 4, it is possible to prevent boundary erosion, but it is possible to avoid a further increase in cost because a large amount of expensive ZCG material is used. Absent.
【０００７】[0007]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、浸漬部全体をＺＣＧ材質としたノズルと同
等に境界溶損を起こさず、アルミナの付着防止効果に優
れておりながら、ＺＣＧ材質の使用量を最小限にした連
続鋳造用浸漬ノズルを提供することにある。The problem to be solved by the present invention is that a ZCG material having the same effect of preventing the boundary erosion and preventing alumina from adhering, as well as a nozzle made of ZCG material for the entire immersion part, An object of the present invention is to provide a continuous casting immersion nozzle that minimizes the amount of material used.
【０００８】[0008]
【課題を解決するための手段】本発明は、吐出孔内での
アルミナの付着は、一般的に内孔側の方が付着量が多
く、外表面側の方が付着量が少ないことの理由の解明に
基づいて完成したものであり、吐出孔内でのアルミナの
付着は、吐出孔内の内孔側を起点に堆積が始まり、それ
が徐々に外表面側へ進むものと考えられ、このことか
ら、吐出孔の外表面側は内孔側と比較してアルミナ付着
防止材質を適用する必要性が小さいという知見に基づ
く。SUMMARY OF THE INVENTION The present invention is based on the reason that the amount of alumina adhered in the discharge hole is generally larger on the inner hole side and smaller on the outer surface side. It is considered that the deposition of alumina in the discharge hole starts from the inner hole side of the discharge hole and gradually progresses to the outer surface side. Therefore, it is based on the finding that the outer surface side of the discharge hole is less required to apply the alumina adhesion preventing material than the inner hole side.
【０００９】すなわち、本発明は、ＺＣＧ材質の内張り
材の吐出孔の内面における内張り範囲を外表面から内孔
側に向かって１ｍｍ以上の箇所から内孔に至る範囲と
し、且つ、その内張りの長さが吐出口全長の１／２以上
の長さとしたことを特徴とする。That is, according to the present invention, the lining range on the inner surface of the discharge hole of the ZCG lining material is set to a range from 1 mm or more from the outer surface to the inner hole side to the inner hole, and the length of the lining is extended. The length is set to be at least half the total length of the discharge port.
【００１０】言い換えれば、このＺＣＧ材質内張り材の
内張りが施されない部分の長さは、使用中に溶損しても
内張り材が表面に露出しないような長さであることが好
ましく、材質や使用条件により決まるものであるが一般
の使用では浸漬ノズルの外表面から１ｍｍ以上の長さで
あることが好ましい。In other words, the length of the portion of the ZCG lining material that is not lined is preferably such that the lining material is not exposed to the surface even if it is melted during use. In general use, the length is preferably 1 mm or more from the outer surface of the immersion nozzle.
【００１１】内張り材の配置されない部分が、外表面か
ら１ｍｍ未満の場合には、本体部が溶損により消失し、
界面が現れて界面が溶損しやすくなる。また、この内張
り材の配置されない部分６の長さを大きくしすぎると内
張り材の適用面積が少なすぎて、介在物の析出による吐
出孔の閉塞が問題になることがあり、内張り材は、内面
側から最低吐出孔の全長の１／２の長さ以上を確保して
おくことが好ましい。なお、本発明は種々の添加物を含
有する全てのＺＣＧ材質においても有効であるが、特に
ＳｉＯ2系化合物を含有するＺＣＧ材質に対しては効果
がある。これは、ＳｉＯ2系化合物中のＳｉＯ2が反応物
の融点を低下させるため境界溶損が大きくなるためであ
る。When the portion where the lining material is not disposed is less than 1 mm from the outer surface, the main body disappears due to erosion,
An interface appears and the interface is easily melted. Also, if the length of the portion 6 where the lining material is not disposed is too large, the application area of the lining material is too small, and the discharge holes may be blocked due to the precipitation of inclusions. It is preferable to secure at least half the length of the minimum discharge hole from the side. The present invention is effective for all ZCG materials containing various additives, but is particularly effective for ZCG materials containing SiO 2 -based compounds. This is because SiO 2 in the SiO 2 compound lowers the melting point of the reactant, so that boundary erosion increases.
【００１２】[0012]
【発明の実施の形態】以下、図１に示す実施例によって
本発明の実施の形態を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to an embodiment shown in FIG.
【００１３】図１に示す浸漬ノズル１０は全長７００ｍ
ｍ、外径１５０ｍｍで、溶鋼が通過する直径９０ｍｍの
内孔１と直径８０ｍｍの２つの吐出孔２を有し、内孔面
８と吐出孔２の内面９には７ｍｍ厚みで内張り材が内張
りされている。浸漬ノズルの吐出孔２の全長は３０ｍｍ
である。この浸漬ノズルは、本体部４はＡｌ2Ｏ3−Ｃ材
質、パウダーライン部５がＺｒＯ2−Ｃ材質からなり、
内孔１と吐出孔２には内張り材３としてＺＣＧ材質から
なる内張りが施されている。The immersion nozzle 10 shown in FIG.
m, having an outer diameter of 150 mm, an inner hole 1 having a diameter of 90 mm through which molten steel passes, and two discharge holes 2 having a diameter of 80 mm, and a lining material having a thickness of 7 mm is lined on the inner hole surface 8 and the inner surface 9 of the discharge hole 2. Have been. The total length of the discharge hole 2 of the immersion nozzle is 30 mm
It is. In this immersion nozzle, the main body portion 4 is made of an Al 2 O 3 -C material, and the powder line portion 5 is made of a ZrO 2 -C material.
The inner hole 1 and the discharge hole 2 are provided with a lining made of a ZCG material as a lining material 3.
【００１４】吐出孔２においては、内張り材３の配置さ
れない部分６は外表面７から内孔１に向かって１０ｍｍ
までの長さであり、この部分６には本体部４と同じ材質
が配置されている。この内張り材３の配置されない部分
６の材質は、本体部との境界の溶損を考慮して本体部と
同材質系のものが好ましい。In the discharge hole 2, the portion 6 where the lining material 3 is not disposed is 10 mm from the outer surface 7 toward the inner hole 1.
In this portion 6, the same material as that of the main body 4 is disposed. The material of the portion 6 where the lining material 3 is not disposed is preferably the same material as that of the main body in consideration of erosion at the boundary with the main body.
【００１５】内張り材の配置されない部分の長さの影響
について調査するため、本体部４をＡｌ2Ｏ3−Ｃ材質、
パウダーライン部５をＺｒＯ2−Ｃ材質、内張り材３を
ＺＣＧ材質という材質構成の浸漬ノズルを作製した。本
体部４の材質は、焼成後の化学組成がＡｌ2Ｏ3=６９
％、Ｃ=３０％、パウダーライン部材質はＺｒＯ2=８０
％、Ｃ=１６％となる配合を使用した。ＺＣＧ材質は表
１に示す原料割合で混練した。混練は適量のフェノール
レジンを添加して混練し配合を得た。In order to investigate the influence of the length of the portion where the lining material is not disposed, the main body 4 is made of an Al 2 O 3 -C material,
An immersion nozzle having a material composition in which the powder line portion 5 was made of a ZrO 2 -C material and the lining material 3 was made of a ZCG material was produced. The material of the main body 4 has a chemical composition after firing of Al 2 O 3 = 69.
%, C = 30%, powder line material is ZrO 2 = 80
%, C = 16%. The ZCG materials were kneaded at the raw material ratios shown in Table 1. For kneading, an appropriate amount of phenol resin was added and kneaded to obtain a compound.
【００１６】[0016]
【表１】 成形は外表面からの内張り材までの距離が変化するよう
に配合投入位置を仕切によって調整してモールドに所定
の配合を投入し１０００ｋｇ／ｃｍ2の圧力で成形し
た。成形体はコークス中に埋め込んで最高温度１０００
℃にて還元焼成を行った。焼成後は所定の形状に機械加
工し酸化防止剤を塗布して試験品とした。外表面からの
内張り材までの距離についてはＸ線透過により所定の距
離にあることを確認した。[Table 1] The molding was performed by adjusting the blending input position by a partition so that the distance from the outer surface to the lining material was changed, charging a predetermined blend into the mold, and molding at a pressure of 1000 kg / cm 2 . The molded body is embedded in coke and the maximum temperature is 1000
Reduction calcination was performed at ℃. After firing, the sample was machined into a predetermined shape, and an antioxidant was applied to obtain a test sample. It was confirmed that the distance from the outer surface to the lining material was at a predetermined distance by X-ray transmission.
【００１７】試験品をスラブ連鋳機にて実炉試験に供し
た。取鍋の容量は３２０ｔｏｎ、１ｃｈあたりの鋳造時
間は約３５分で、アルミキルド鋼を鋳造した。テスト本
数は各々３本ずつで、１本あたり平均して約２５０分使
用した。使用後のノズルを回収し、カットして断面を観
察し、吐出孔部の最大アルミナ付着量と浸漬部本体材質
との境界溶損量（モールドパウダーの浸潤部を含む）を
測定し平均値を表２に示す。The test specimen was subjected to an actual furnace test using a continuous slab caster. The capacity of the ladle was 320 tons, the casting time per ch was about 35 minutes, and aluminum killed steel was cast. The number of test pieces was three each, and each piece was used for about 250 minutes on average. Collect the used nozzle, cut it, observe the cross section, measure the maximum amount of alumina attached to the discharge hole and the boundary erosion amount (including the infiltrated part of the mold powder) between the material of the immersion part and the average value. It is shown in Table 2.
【００１８】[0018]
【表２】 その結果、本発明の実施例であるＮｏ．２〜Ｎｏ．４は
従来品であるＮｏ．１と比較してアルミナの付着量はほ
とんど変わらないにも関わらず境界溶損が大きく減少し
ており良好な結果となった。また、比較例のＮｏ．５
は、内張り材の配置されない部分の長さが２０ｍｍであ
り吐出口全長の１／２以上の長さとなり、内張り材が不
足しアルミナ付着量が多くなった。[Table 2] As a result, No. 1 of the embodiment of the present invention was obtained. 2-No. No. 4 is a conventional product. As compared with No. 1, the boundary erosion was greatly reduced although the amount of alumina deposited hardly changed, and good results were obtained. In addition, No. of the comparative example. 5
The length of the portion where the lining material was not disposed was 20 mm, which was 以上 or more of the total length of the discharge port. The lining material was insufficient, and the amount of alumina attached increased.
【００１９】[0019]
【発明の効果】本発明によって、アルミナ付着防止効果
に影響を与えることなく、高価なアルミナ付着防止材質
であるＺＣＧの使用量を最小限とすることができ、浸漬
部全体をＺＣＧ材質としたものと同等に境界溶損を防止
することが可能である。According to the present invention, the amount of ZCG which is an expensive material for preventing adhesion of alumina can be minimized without affecting the effect of preventing adhesion of alumina, and the entire immersion portion is made of ZCG material. Boundary erosion can be prevented as well as the above.
【００２０】したがって、本発明を適用することによっ
て、母材とＺＣＧ材質の境界溶損を防止しつつ吐出孔へ
のアルミナ付着量の減少を図ることで、鋼品質の向上と
安定鋳造に寄与する。Therefore, by applying the present invention, it is possible to improve the quality of steel and contribute to stable casting by reducing the amount of alumina adhering to the discharge holes while preventing boundary erosion between the base material and the ZCG material. .
【図１】 本発明の実施例による浸漬ノズルの断面図で
ある。FIG. 1 is a sectional view of an immersion nozzle according to an embodiment of the present invention.
【図２】 内孔面及び吐出口の内面全体を内張りした従
来の浸漬ノズルの断面図を示す。FIG. 2 is a cross-sectional view of a conventional immersion nozzle in which the entire inner surface of an inner hole surface and an inner surface of a discharge port are lined.
【図３】 内孔面のみに内張りした従来の浸漬ノズルの
断面図を示す。FIG. 3 shows a cross-sectional view of a conventional immersion nozzle lined only to the inner hole surface.
【図４】 浸漬部全体をＺＣＧ材質とした従来の浸漬ノ
ズルの断面図を示す。FIG. 4 is a sectional view of a conventional immersion nozzle in which the entire immersion portion is made of ZCG material.
１ 内孔 ２ 吐出孔 ３ 内張り材 ４ 本体部 ５ パウダーライン部 ６ 内張り材の配置されない部分 ７ 外表面 ８ 内孔面 ９ 吐出孔の内面 １０ 本発明の浸漬ノズル １１ 浸漬部 REFERENCE SIGNS LIST 1 inner hole 2 discharge hole 3 lining material 4 main body part 5 powder line part 6 part where no lining material is arranged 7 outer surface 8 inner hole surface 9 inner surface of discharge hole 10 immersion nozzle of the present invention 11 immersion part
Claims (1)
ｒＯ2系クリンカーおよび炭素材を主成分とする内張り
材が吐出孔の内面に内張りされている連続鋳造用浸漬ノ
ズルにおいて、 前記ＣａＺｒＯ3を主成分とするＣａＯ−ＺｒＯ2系クリ
ンカーおよび炭素材を主成分とする内張り材の吐出孔の
内面における内張り範囲を外表面から内孔側に向かって
１ｍｍ以上の箇所から内孔に至る範囲とし、且つ、その
内張りの長さが吐出口全長の１／２以上の長さとしたこ
とを特徴とする連続鋳造用浸漬ノズル。1. A CaO-Z containing CaZrO 3 as a main component.
In a continuous casting immersion nozzle in which a lining material containing rO 2 -based clinker and carbon material as main components is lined on the inner surface of the discharge hole, the CaO-ZrO 2 -based clinker containing CaZrO 3 as main component and carbon material are mainly used. The lining range on the inner surface of the discharge hole of the lining material as a component is set to a range from a point of 1 mm or more from the outer surface toward the inner hole to the inner hole, and the length of the lining is の of the entire length of the discharge port. A continuous casting immersion nozzle having a length as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9358469A JPH11188463A (en) | 1997-12-25 | 1997-12-25 | Immersion nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9358469A JPH11188463A (en) | 1997-12-25 | 1997-12-25 | Immersion nozzle for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11188463A true JPH11188463A (en) | 1999-07-13 |
Family
ID=18459477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9358469A Pending JPH11188463A (en) | 1997-12-25 | 1997-12-25 | Immersion nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11188463A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007260711A (en) * | 2006-03-28 | 2007-10-11 | Jfe Steel Kk | Method for continuously casting steel |
| KR101597254B1 (en) * | 2014-10-31 | 2016-02-24 | 주식회사 포스코 | Submerged nozzle for continuous casting |
| CN114247878A (en) * | 2021-12-24 | 2022-03-29 | 马鞍山市益江高温陶瓷制造有限公司 | Immersion type water gap of once-formed full-lining composite plate blank and manufacturing method thereof |
-
1997
- 1997-12-25 JP JP9358469A patent/JPH11188463A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007260711A (en) * | 2006-03-28 | 2007-10-11 | Jfe Steel Kk | Method for continuously casting steel |
| KR101597254B1 (en) * | 2014-10-31 | 2016-02-24 | 주식회사 포스코 | Submerged nozzle for continuous casting |
| WO2016068469A1 (en) * | 2014-10-31 | 2016-05-06 | 주식회사 포스코 | Submerged nozzle for continuous casting |
| JP2018501109A (en) * | 2014-10-31 | 2018-01-18 | ポスコＰｏｓｃｏ | Immersion nozzle for continuous casting |
| CN114247878A (en) * | 2021-12-24 | 2022-03-29 | 马鞍山市益江高温陶瓷制造有限公司 | Immersion type water gap of once-formed full-lining composite plate blank and manufacturing method thereof |
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