JPS63123553A - Submerged nozzle for continuous casting - Google Patents
Submerged nozzle for continuous castingInfo
- Publication number
- JPS63123553A JPS63123553A JP26778986A JP26778986A JPS63123553A JP S63123553 A JPS63123553 A JP S63123553A JP 26778986 A JP26778986 A JP 26778986A JP 26778986 A JP26778986 A JP 26778986A JP S63123553 A JPS63123553 A JP S63123553A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- roughness
- grain size
- refractory composition
- immersion nozzle
- 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.)
- Granted
Links
- 238000009749 continuous casting Methods 0.000 title claims description 8
- 239000000203 mixture Substances 0.000 claims abstract description 19
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000007654 immersion Methods 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 230000006866 deterioration Effects 0.000 abstract description 3
- 239000006104 solid solution Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 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
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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)
- 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 本発明は連続鋳造に用いる浸漬ノズルに関する。[Detailed description of the invention] Industrial applications The present invention relates to a submerged nozzle used in continuous casting.
従来の技術
連続鋳造においては、取鍋からタンディツシュ、更にタ
ンディツシュから鋳型へ溶湯を注入する際に、溶湯の酸
化防止、スラグの巻込み防止、及び介在物の浮上促進等
の理由から浸漬ノズルが用いられている。Conventional technology In continuous casting, an immersion nozzle is used to inject molten metal from the ladle to the tundish and from the tundish to the mold for reasons such as preventing oxidation of the molten metal, preventing entrainment of slag, and promoting the floating of inclusions. It is being
この浸漬ノズルは前記問題点の解決に多大の効果を果た
した。しかし、この浸漬ノズルは逆に該浸漬ノズルに起
因した介在物の付着、及びこれに伴うノズル閉塞、ある
いは付着物の剥離による品質阻害等の問題を生じた。This immersion nozzle has been very effective in solving the above problems. However, this immersion nozzle conversely caused problems such as attachment of inclusions caused by the immersion nozzle, resulting in nozzle clogging, or quality deterioration due to peeling off of the deposits.
従って、従来よりノズル閉塞、介在物の付着等を防止す
る浸漬ノズルとして、例えば特開昭５２−１４８４３０
号公報のように浸漬ノズルの溶鋼流通孔の内面に、黒鉛
アルミナ質、ジルコニア、ムライト系からなる内挿ノズ
ルを設けてノズル閉塞を防止するか、あるいは特開昭５
７−８５８５８号公報のように浸漬ノズル内面をＭｇＯ
−Ｃ耐火物で形成して、Ａｌｌ ２０３系介在物の付着
防止と耐食性の向上を図る浸漬ノズル等が提案されてい
る。Therefore, conventionally, as a submerged nozzle for preventing nozzle clogging, adhesion of inclusions, etc.,
To prevent nozzle clogging, an inserted nozzle made of graphite alumina, zirconia, or mullite is provided on the inner surface of the molten steel flow hole of the immersion nozzle, as in Japanese Patent Laid-Open No. 5
The inner surface of the immersion nozzle is coated with MgO as in Publication No. 7-85858.
Immersion nozzles and the like have been proposed that are made of -C refractories to prevent the adhesion of All 203 inclusions and improve corrosion resistance.
しかしながら、これ等従来の浸漬ノズルでは、該浸漬ノ
ズルの閉塞及び介在物の付着防止を十分に抑制できない
、即ちこれ等は単に該浸漬ノズル内質あるいは内挿ノズ
ルの材質を変更しても１強度、耐食性等から適用材質に
限界がある。また付着あるいは析出物に対する馴染み性
から、材質の選択により若干付着を抑制できるが完全で
はなく、連々鋳比率の増加につれてノズル閉塞、付着等
が多発し、連続鋳造における解決すべ！！重要課題とな
っている。However, with these conventional immersion nozzles, it is not possible to sufficiently suppress the blockage of the immersion nozzle and the adhesion of inclusions.In other words, even if the internal properties of the immersion nozzle or the material of the inserted nozzle are simply changed, the strength of the immersion nozzle remains unchanged. There are limits to the materials that can be used due to corrosion resistance, etc. Also, due to its compatibility with adhesion or precipitates, adhesion can be suppressed to some extent by selecting the material, but it is not completely possible, and as the casting ratio increases, nozzle clogging, adhesion, etc. occur frequently, and this should be solved in continuous casting! ! This has become an important issue.
発明が解決しようとする問題点
本発明は前述した如き従来の浸漬ノズルの欠点であるノ
ズル閉塞、及び介在物の付着と剥離を防止して、高品質
鋳片の鋳造を実現するとともに、何んら浸漬ノズル本来
の材質を損うことのない浸漬ノズルの提供にある。Problems to be Solved by the Invention The present invention prevents nozzle clogging and adhesion and peeling of inclusions, which are the drawbacks of the conventional immersion nozzle as described above, and achieves the casting of high-quality slabs. To provide an immersion nozzle that does not damage the original material of the immersion nozzle.
問題点を解決するための手段
以下本発明による連続鋳造用浸漬ノズルについて述べる
。Means for Solving the Problems The immersion nozzle for continuous casting according to the present invention will be described below.
まず、本発明者等は、連続鋳造時のロングノズルあるい
は鋳型に注湯する浸漬ノズル（以下単に浸漬ノズルと総
称する）の介在物等の付着とノズル閉塞について、該浸
漬ノズル内面の初期粗度を特定領域とした浸漬ノズルを
先に提案し、かなりの効果を達成した。First, the present inventors investigated the initial roughness of the inner surface of the long nozzle during continuous casting or the immersion nozzle (hereinafter simply referred to as the immersion nozzle) for adhesion of inclusions and nozzle blockage. We first proposed an immersion nozzle with a specific area, and achieved considerable results.
しかし、該浸漬ノズルは鋳造に伴う損耗によって、中心
線平均粗度（以下単に粗度と称する）が大きく変動し、
表面粗度を必ずしも緩慢に形成し得ない。However, the center line average roughness (hereinafter simply referred to as roughness) of the immersion nozzle fluctuates greatly due to wear and tear associated with casting.
Surface roughness cannot necessarily be formed slowly.
また、研磨あるいは研削等によって初期粗度を満足して
も、前記の損耗過程で粗度の悪化を生じ、安定した付着
防止とノズル閉塞を防止できないことがわかった。Furthermore, it has been found that even if the initial roughness is satisfied by polishing or grinding, the roughness deteriorates during the wear process, making it impossible to stably prevent adhesion and nozzle clogging.
そこで本発明においては、浸漬ノズルの初期粗度を特定
域とするため該粗度形成に大きく影響する耐火組成物の
粗度を限定するとともに、該耐火組成物を一定層厚に形
成することにより、初期はもちろん注湯中の粗度変化の
緩慢化を図るものである。Therefore, in the present invention, in order to set the initial roughness of the immersion nozzle in a specific range, the roughness of the refractory composition that greatly influences the formation of the roughness is limited, and the refractory composition is formed to have a constant layer thickness. This is intended to slow down the change in roughness both initially and during pouring.
而して、本発明は、浸漬ノズルの吐出孔を含めた内面の
一部若しくは全面に、少なくとも２ｍｍの層厚を形成す
る耐火組成物の粒度の大半を０．１５ｍ５＋以下とし且
つこれに粒度０．３〜１．Ｏｒａ■の未安定ジルコニア
骨材を１〜５％添加したことにある。Accordingly, the present invention provides that most of the particle size of the refractory composition forming a layer thickness of at least 2 mm on a part or the entire surface of the inner surface including the discharge hole of the immersion nozzle is 0.15 m5+ or less, and that the particle size of the refractory composition is 0.15 m5+ or less. .3-1. This is due to the addition of 1 to 5% of Ora's unstabilized zirconia aggregate.
この粒度を有する耐火組成物を用いることによって、ノ
ズル内面の初期粗度（ＲＡ）を３．５以下に形成するこ
とができる。By using a refractory composition having this particle size, it is possible to form the nozzle inner surface with an initial roughness (RA) of 3.5 or less.
また、大半がＱ、１５ｍｍ以下の細粒層にＣａＯｌＭｇ
Ｏ、Ｙ２Ｏ３等を固溶していない０．３〜１．Ｏｍｍｃ
ｙ）未安定ジルコニア骨材を１〜５％内で添加するので
表層の加熱冷却による熱応力の亀裂進展のエネルギーを
、該未安定ジルコニアの鉱物転移による粒子崩壊により
吸収する。更には大粒の骨材を添加しても粒子崩壊によ
り表面粗度も常に良好であることから好ましい結果が得
られる。In addition, the majority is Q, CaOlMg in the fine grain layer of 15 mm or less.
0.3 to 1.0 with no solid solution of O, Y2O3, etc. Ommc
y) Since 1 to 5% of unstabilized zirconia aggregate is added, the energy of crack propagation due to thermal stress due to heating and cooling of the surface layer is absorbed by particle collapse due to mineral transition of the unstabilized zirconia. Furthermore, even if large aggregates are added, the surface roughness is always good due to particle collapse, so favorable results can be obtained.
この添加条件として粒度が小さいと粒子崩壊による吸収
効果が小さく、逆に粒度が大きいと全体強度劣化を招く
、シかも添加量も少ないと緩和作用がなく、逆に多いと
強度の低下を生ずることから前記範囲とする。The conditions for this addition are that if the particle size is small, the absorption effect due to particle collapse will be small, and on the other hand, if the particle size is large, the overall strength will deteriorate.If the addition amount is too small, there will be no relaxation effect, and if it is too large, the strength will decrease. to the above range.
しかも注湯中においても、耐火組成物の表層粒度の大半
がＯ，１５ｍｍ以下であるために、局部損耗が抑制され
良好な粗度が保持される。この理由から形成される細粒
層は２膳腸〜３０■腸の範囲とし、好ましくは５〜１０
■鳳である。この細粒層が２鳳霧より薄いと早期溶落に
より粗度の悪化となる。また耐火組成物の粒度が、ノズ
ル全体に使用された場合、耐火組成物層が緻密質になり
、弾性率が増加し、耐熱衝撃抵抗（＃熱スポーリング性
）性が低下する。あるいは耐火組成物の均一混練が困難
となり組織の内部欠陥が発生し易くなる。Moreover, even during pouring, since most of the particle size of the surface layer of the refractory composition is 0.15 mm or less, local wear is suppressed and good roughness is maintained. For this reason, the fine particle layer formed should be in the range of 2 to 30 microns, preferably 5 to 10 microns.
■It's Otori. If this fine grain layer is thinner than 2 tungsten, the roughness will deteriorate due to early melting. Further, when the particle size of the refractory composition is used throughout the nozzle, the refractory composition layer becomes dense, the elastic modulus increases, and the thermal shock resistance (#thermal spalling resistance) decreases. Alternatively, it becomes difficult to uniformly knead the refractory composition, and internal defects in the structure are likely to occur.
一方、粒度が未発゛明範囲を超えると注湯時の溶湯によ
る損耗時に耐火物の溶損により耐火物粒子が脱落し、表
面荒れを促進し、結果として粗度が悪化し、介在物の付
着とノズル閉塞を招く。On the other hand, if the particle size exceeds the unexplored range, the refractory particles will fall off due to erosion of the refractory during wear due to the molten metal during pouring, promoting surface roughness, resulting in worsening of the roughness and formation of inclusions. Resulting in fouling and nozzle blockage.
なお、粗度（ＲＡ）は一般的に用いられている（１）式
（ＪＩＳ規格ＢＯ３０１）を用いて単位長さにおける値
を求める。Note that the roughness (RA) is determined using the commonly used formula (1) (JIS standard BO301).
（ＲＡ）＝−ｒ：ｔ１／（ｘ）１ｄｘ ・・・（１）但
し、Ｌ・・・測定長さくＩＬｌｌ）
／ （Ｘ）・・・粗さ曲線
この粗度（ＲＡ）は中心線平均に限らず絶対値として該
粗度に相当するもので良く、求める式についでも（１）
式に限らず他式を用いても良い。(RA)=-r:t1/(x)1dx...(1) However, L...Measurement length ILll)/(X)...Roughness curve This roughness (RA) is the center line average The roughness is not limited to , and may be equivalent to the roughness as an absolute value.
Not limited to this formula, other formulas may be used.
このように、浸漬ノズルの内面２ｍｎ＋以上の層厚を本
発明範囲内の耐火組成物で形成することによって内表面
を初期粗度（ＲＡ）３．５以下に保持することができ、
平滑面作用によって注湯初期における介在物及び地金の
付着が抑制されるとともに、析出した介在物は注湯流に
押し流されてノズル吐出孔を経て浮上除去される。In this way, by forming a layer thickness of 2 mn+ or more on the inner surface of the immersion nozzle with the refractory composition within the scope of the present invention, the inner surface can be maintained at an initial roughness (RA) of 3.5 or less,
The smooth surface action suppresses the adhesion of inclusions and bare metal during the initial stage of pouring, and the precipitated inclusions are swept away by the pouring flow and floated away through the nozzle discharge hole.
また、注湯中においては当然のこととして該浸漬ノズル
の内面、いわゆる溶湯との接触面及び吐出孔部は溶損さ
れるが、細粒化によっで極めて緩慢な粗面が形成され経
時的な介在物の付着を抑制できる。In addition, during pouring, the inner surface of the immersion nozzle, the so-called contact surface with the molten metal, and the discharge hole are naturally eroded and damaged, but due to grain refinement, a rough surface is formed very slowly and over time. The adhesion of inclusions can be suppressed.
本発明ノズルの製法は特に限定されるものではなく、粒
度及び組成が本発明内の耐火組成物をノズル内面に２ｍ
ｍ以上形成すればよく、吹付は法、流し込み法、スリー
ブ嵌合法等適宜方法が採用できる。The method of manufacturing the nozzle of the present invention is not particularly limited, and a fire-resistant composition having a particle size and composition within the scope of the present invention is coated on the inner surface of the nozzle for 2 m.
m or more, and any appropriate method such as a spraying method, a pouring method, a sleeve fitting method, etc. can be adopted.
実施例 以下本発明の実施例について述べる。Example Examples of the present invention will be described below.
本発明の浸漬ノズルとして表−１に示す如き組成と粒度
で、且つ初期粗度（ＲＡ）値のものと従来の浸漬ノズル
を用いてＭ−にの８チヤージ連々鋳の結果を比較して表
−１に示す。このように末法を用いることにより介在物
の付着、ノズル閉塞、鋳片品質ともに向上することがわ
かる。The table below compares the results of 8-charge continuous casting of M- using the immersion nozzle of the present invention with the composition and particle size as shown in Table 1 and the initial roughness (RA) value and the conventional immersion nozzle. -1. It can be seen that by using the final method, the adhesion of inclusions, nozzle clogging, and slab quality are all improved.
発明の効果
以上述べた如く、本発明の浸漬ノズルを用いることによ
り、介在物及び地金の付着を抑制し、ノズル閉塞を防止
するとともに、鋳込み作業の安定化及び該付着介在物の
剥＃混入による品質阻害を防止できる等、本発明のノズ
ルは極めて優れた浸漬ノズルである。Effects of the Invention As described above, by using the immersion nozzle of the present invention, it is possible to suppress the adhesion of inclusions and base metal, prevent nozzle clogging, stabilize the casting operation, and remove the adhering inclusions. The nozzle of the present invention is an extremely excellent immersion nozzle, as it can prevent the quality from being inhibited by water.
（以下余白）(Margin below)
第１．２．３図は本発明による浸漬ノズルの断面図であ
る。Figure 1.2.3 is a cross-sectional view of a submerged nozzle according to the invention.
Claims (1)
る浸漬ノズルにおいて、該浸漬ノズルを形成する耐火物
の内面から少なくとも２ｍｍの耐火組成物の粒度を０．
１５ｍｍ以下とし且つ該耐火物組成に粒度０．３〜１．
０ｍｍの未安定ジルコニア骨材を１〜５％添加したこと
を特徴とする連続鋳造用浸漬ノズル。(1) In an immersed nozzle for pouring molten metal into a tundish or mold, the particle size of the refractory composition is 0.0 mm at least 2 mm from the inner surface of the refractory forming the immersed nozzle.
15 mm or less, and the refractory composition has a particle size of 0.3 to 1.
A immersion nozzle for continuous casting, characterized in that 1 to 5% of unstabilized zirconia aggregate of 0 mm is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26778986A JPH0636974B2 (en) | 1986-11-12 | 1986-11-12 | Immersion nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26778986A JPH0636974B2 (en) | 1986-11-12 | 1986-11-12 | Immersion nozzle for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63123553A true JPS63123553A (en) | 1988-05-27 |
| JPH0636974B2 JPH0636974B2 (en) | 1994-05-18 |
Family
ID=17449612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26778986A Expired - Fee Related JPH0636974B2 (en) | 1986-11-12 | 1986-11-12 | Immersion nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636974B2 (en) |
-
1986
- 1986-11-12 JP JP26778986A patent/JPH0636974B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0636974B2 (en) | 1994-05-18 |
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