JPH02151353A - Submerged nozzle for continuous casting - Google Patents
Submerged nozzle for continuous castingInfo
- Publication number
- JPH02151353A JPH02151353A JP30614488A JP30614488A JPH02151353A JP H02151353 A JPH02151353 A JP H02151353A JP 30614488 A JP30614488 A JP 30614488A JP 30614488 A JP30614488 A JP 30614488A JP H02151353 A JPH02151353 A JP H02151353A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- submerged nozzle
- holes
- continuous casting
- gas
- 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 abstract description 12
- 238000007664 blowing Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract 3
- 229910000831 Steel Inorganic materials 0.000 description 20
- 239000010959 steel Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 18
- 238000007654 immersion Methods 0.000 description 14
- 238000005266 casting Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 229910000655 Killed steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011819 refractory material Substances 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
- B22D41/58—Pouring-nozzles with gas injecting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
「発明の目的」
（産業上の利用分野）
この発明は製鋼工場の連続鋳造において、使用される浸
漬ノズルの構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to the structure of a submerged nozzle used in continuous casting in a steel factory.
（従来の技術）
鋼の連続鋳造においては、タンデイツシュから鋳造用モ
ールドの間の溶鋼の酸化を防ぐ意味から、浸漬ノズルが
使用されるが、Ａ１キルド鋼等の鋳造においては、？８
鋼中に存在する４ １２０３等に起因するノズルの閉塞
が問題となるため、通常はタンデイツシュ側に配設され
た上ノズルから、もしくは上ノズルの上下段の双方から
ポーラスプラグを介して、計等の不活性ガスが吹込まれ
ている。(Prior Art) In the continuous casting of steel, a submerged nozzle is used to prevent oxidation of molten steel between the tundish and the casting mold, but in the casting of A1 killed steel etc.? 8
Since nozzle blockage caused by 41203, etc. present in steel, is a problem, the meter, etc. Inert gas is blown into the tank.
しかし乍ら、対象的にお互い反対方向へ溶鋼を吐出する
吐出孔近傍においては、吐出方向と直角方向においては
、鋳造開始の初期の段階から急速に付着が進行し、ある
限界に到達すると該位置への付着は進行せず、飽和状態
に達し、その後はそれまで殆んど付着の見られなかった
吐出孔方向への付着が目立つようになり、遂には吐出孔
と直角な方向への付着量と略同−世までの付着が進行し
、初めて双方が飽和状態となる。However, in the vicinity of the discharge holes that discharge molten steel symmetrically in opposite directions, in the direction perpendicular to the discharge direction, adhesion progresses rapidly from the initial stage of casting, and when a certain limit is reached, the The adhesion does not progress and reaches a saturated state, after which the adhesion towards the discharge hole, where almost no adhesion was observed until then, becomes noticeable, and finally the amount of adhesion in the direction perpendicular to the discharge hole decreases. The adhesion progresses to almost the same age as the two, and for the first time, both reach a saturated state.
このようなノズル内溶鋼の通路におけるＡ Ｉ！２０３
等の付着の推移をみると、溶鋼流の分布が大きく関与し
ていることが判る。AI in such a passage of molten steel inside the nozzle! 203
Looking at the progress of adhesion, it can be seen that the distribution of molten steel flow is greatly involved.
即ち、前述したような吐出孔に直交する方向のノズル内
壁への非金属介在物の付着が急速に進行するのは、この
近傍に大きな溶鋼流速の減速域が存在することに他なら
ず、このような付着現象の解明がのぞまれていた。この
ような溶鋼吐出孔近傍におけるＡｌ２０１等の付着を防
止する手段として浸漬ノズルのノズル孔上部の内側にポ
ーラスプラグを設けて計等を吹込む方法も提案されてい
るが、この方法では吐出鋼の側壁もしくは底部への付着
の防止効果は殆ど改善されていない。特開昭６２−１３
０７５４においては吐出鋼の周側および底部に直接、通
気多孔部（ポーラス成型）をノズル本体と同質材料にし
て一体成形せしめてガスを吹込むことを提案している。In other words, the reason why non-metallic inclusions rapidly adhere to the nozzle inner wall in the direction perpendicular to the discharge hole as described above is due to the presence of a large deceleration region of the molten steel flow velocity in this vicinity. Elucidation of such adhesion phenomena has been desired. As a means of preventing the adhesion of Al201, etc. near the molten steel discharge hole, a method has been proposed in which a porous plug is installed inside the upper part of the nozzle hole of the immersion nozzle and a meter is blown into the nozzle. The effect of preventing adhesion to the side walls or the bottom has hardly been improved. Unexamined Patent Publication 1986-13
No. 0754 proposes that gas be blown into the nozzle body by integrally molding a ventilation hole (porous molding) with the same material as the nozzle body directly on the circumferential side and bottom of the discharge steel.
このガス吹込型浸漬ノズルを使用する場合、Ａｈ（ｈの
付着を著しく減少せしめることができるが、ポーラスな
ガス吹込み部を溶鋼接触部のかなりの面積で有している
構造的欠陥は、ノズル本体と同質耐火材料を使用したと
しても克服することは困難であり、耐溶損性に疑問のあ
るのは否めない。When using this gas-blown submerged nozzle, the adhesion of Ah (h) can be significantly reduced. Even if the same refractory material as the main body is used, it would be difficult to overcome this problem, and the erosion resistance is undeniably questionable.
（発明が解決しようとする課題）
本発明は、前述したような現状に鑑み創案されたもので
あり、鋳造の初期に介在物の付着する吐出孔に対し水平
方向で９０″の左右内壁面の中央部からＡｒ等の不活性
ガスを吹込むことにより、特に安定した計流量を確保す
ることができ、且つ溶鋼の流れを早くして、ガス吹込み
部はポーラス成型を避けた貫通細孔とすることにより、
非金属介在物の付着を防止する浸漬ノズルの構造を提供
することを目的とする。(Problems to be Solved by the Invention) The present invention has been devised in view of the above-mentioned current situation, and the present invention has been devised in view of the current situation as described above. By injecting an inert gas such as Ar from the center, a particularly stable metered flow rate can be ensured, and the flow of molten steel is made faster. By doing so,
The object of the present invention is to provide a structure for a submerged nozzle that prevents the attachment of non-metallic inclusions.
「発明の構成」
（課題を解決するための手段）
前述の目的を達成するために本発明者等は２個の吐出孔
を有する浸漬ノズルにおいて、前記吐出孔に対し水平方
向９０６の左右内壁面中央部の、各々の吐出孔中心線の
交点を基準にして、その垂直上方に、幅５〜３０龍、高
さ３０〜１００ ｍｍの範囲に通気率０．１〜０．５
ｍ＋ｅφの貫通細孔を少なくとも片側に２個以上配設し
、浸漬ノズル壁体のガス流路に接続せしめたことを特徴
とする連続鋳造用浸漬ノズルを芸に提案する。"Structure of the Invention" (Means for Solving the Problems) In order to achieve the above-mentioned object, the present inventors have developed a submerged nozzle having two discharge holes, in which the left and right inner wall surfaces in the horizontal direction 906 with respect to the discharge holes are In the center, based on the intersection of the center lines of each discharge hole, perpendicularly above the intersection, a width of 5 to 30 mm and a height of 30 to 100 mm is provided with an air permeability of 0.1 to 0.5.
An immersion nozzle for continuous casting is proposed, characterized in that two or more through holes of m+eφ are arranged on at least one side and are connected to a gas flow path of a wall of the immersion nozzle.
（作用）
本発明は、取鍋もしくはタンデイツシュの底部、溶鋼排
出部の上ノズルもしくは上ノズルの上下段からポーラス
プラグ等を介して計吹込みを行なう従来の一般的な方法
とは別に、特に浸漬ノズルの下部に付着する非金属介在
物の析出を防止するための手段を備えた浸漬ノズルの構
造に関するものである。(Function) The present invention is different from the conventional general method of performing metered injection from the bottom of a ladle or tundish, the upper nozzle of the molten steel discharge part, or the upper and lower stages of the upper nozzle through a porous plug, etc. The present invention relates to a structure of an immersion nozzle equipped with means for preventing the precipitation of non-metallic inclusions adhering to the lower part of the nozzle.
特許請求の範囲における数値の限定は、介在物の沈積付
着を生じ易い溶鋼流の流速の遅くなる所の特定と、連続
鋳造の続行においてもコンスタントなガス量を送給する
ために必要な数字を表すものである。本願発明において
貫通細孔としたのは安定したＡｒガス流量を確保するこ
とを主眼とした鋳造方法に好適であるからである。Numerical limitations in the claims are intended to identify locations where the flow velocity of molten steel is slow, where inclusions tend to accumulate, and to determine the numbers necessary to supply a constant amount of gas even during continuous casting. It represents. The reason why the through holes are used in the present invention is that they are suitable for a casting method that focuses on ensuring a stable Ar gas flow rate.
使用する浸漬ノズルは、２個の溶鋼吐出孔を有する浸漬
ノズルであって、吐出孔の軸線に対し９０°の左右内壁
面の中央部で、しかも吐出孔中心線の交点を基準にして
その垂直上方に幅５〜３０ｍ■、高さ３０〜１００ ｍ
ｍの範囲に０．１〜０．５龍φの貫通細孔を片側に少な
くとも２個以上配設し、これらを浸漬ノズル壁体内に設
けたガス流路と接続せしめたことを特徴とするが、ガス
の吹込み位置を吐出孔中心線の交点から垂直上方に幅５
〜３０ｍｍとしたのは、５韻未満では吹込みの効果が期
待できず、３０ｕ＋を超えても効果は飽和するからであ
る。又、高さを３０〜１．００ｕ＋と限定したのは、多
くの実験によりこの高さが最も流速の衰える所であるこ
との理由による。貫通細孔の大きさを、０．１〜０．５
ａｍφとしたのは、鋳造速度に応じた孔径を採用する
ことができるようにするためであり、高速鋳込において
は、大きい孔径のものを低速鋳込においては、小径のも
のを使用する必要がある。理由は溶鋼のノズル内の流速
によって貫通細孔からの噴出ガスが分断されるからであ
る。片側の個数を２個以上としたのは、１個では溶鋼に
与える影響が少な過ぎることによる他、通気ガスの量を
背圧Ｌｋｇ／ｃｆｆｌのもとて最大５ Ｎ７！／ｍｉｎ
までしか流れないように、貫通細孔の径に応じて簡単に
計算しうるようにするためである。又、この貫通細孔を
利用するのは、・仮りに溶損等が発生しても安定したガ
スの吹込み量を確保するためであり、この点、従来のポ
ーラスプラグは損耗量が大きく問題点を有していた。本
発明の場合、従来のガス吹込型浸漬ノズルのようにガス
吹込み部をポーラスとせず、貫通細孔を形成せしめる位
置に有機質線条等を配置するのみで、高圧一体成型を行
うから耐溶存性に優れている。又、従来の浸漬ノズルの
ように位置を特定せず漫然と上部から吹込む場合と異な
り、溶鋼の吐出鋼側部もしくは底部に付着する原因とな
る溶鋼流速の正確な減速域に、ガスを吹込むことになる
から少量で効果を上げることができる。The immersed nozzle used is a immersed nozzle that has two molten steel discharge holes, and is located at the center of the left and right inner wall surfaces at 90 degrees to the axis of the discharge hole, and perpendicular to the intersection of the center lines of the discharge holes. Width 5-30m above, height 30-100m
It is characterized in that at least two through holes with a diameter of 0.1 to 0.5 mm are arranged on one side in the range of m, and these are connected to a gas flow path provided in the wall of the immersion nozzle. , move the gas injection position vertically upward from the intersection of the center lines of the discharge holes by a width of 5 mm.
The reason for setting the length to 30 mm is that the effect of blowing cannot be expected with less than 5 rhymes, and the effect will be saturated even if it exceeds 30 u+. Further, the reason why the height is limited to 30 to 1.00 u+ is because many experiments have shown that this height is where the flow velocity decreases the most. The size of the through pore is 0.1 to 0.5.
The reason for choosing amφ is to be able to adopt a hole diameter that corresponds to the casting speed.For high-speed casting, it is necessary to use a large-diameter hole, and for low-speed casting, it is necessary to use a small-diameter hole. be. This is because the gas ejected from the through-holes is divided by the flow velocity of the molten steel in the nozzle. The number of gases on one side was set to two or more because one gas would have too little effect on the molten steel, and the amount of ventilation gas was increased to a maximum of 5 N7 under a back pressure of Lkg/cffl! /min
This is to make it easy to calculate according to the diameter of the through pore so that the flow only reaches up to In addition, the purpose of using these through pores is to ensure a stable amount of gas injection even if melting damage occurs, and in this respect, conventional porous plugs have a large amount of wear and tear, which is a problem. It had a point. In the case of the present invention, unlike conventional gas injection submerged nozzles, the gas injection part is not made porous, but only organic filaments are placed at positions where through pores are formed, and high-pressure integral molding is performed, so it is resistant to dissolution. Excellent in sex. Also, unlike conventional immersion nozzles, which blow in from the top without specifying the position, the gas is blown into the precise deceleration region of the molten steel flow velocity, which causes the molten steel to adhere to the side or bottom of the discharged steel. Therefore, a small amount can be effective.
（実施例）
２個の吐出孔（孔径：８５璽■φ）を存する長さニア６
０ｍｍ流入孔径：９０龍φの浸漬ノズルにおいて、吐出
孔の中心線の交点を基準としてその垂直上方に、幅３０
龍、高さ３０〜１００ ＋ｕの範囲に、０．３鰭φの貫
通細孔を両側に夫々６個（２列３段）配設した浸漬ノズ
ルを製造した。(Example) Length near 6 with 2 discharge holes (hole diameter: 85 cm φ)
0mm Inflow hole diameter: In a immersion nozzle with a diameter of 90mm, a width of 30mm is placed vertically above the intersection of the center lines of the discharge hole as a reference.
An immersion nozzle having a height of 30 to 100 mm and having 6 through holes (2 rows and 3 stages) on both sides with a diameter of 0.3 fins was manufactured.
該浸漬ノズルを使用し、低炭Ａ１キルド鋼を鋳造速度：
２．５ｍ／分で鋳込みながら計を１．０β／ｌｏｎの割
合で吹込み、合計９００トンの連続鋳造を行なった。従
来と異なり殆んど介在物が付着しないことが判った。図
面は本発明の連続鋳造用浸漬ノズル１の要部を示す断面
図であって貫通細孔からなるガス吹込み用貫通細孔２、
ガス流路３、？８ｔＡ吐出孔４、の位置を示す。Casting speed of low carbon A1 killed steel using the immersion nozzle:
A total of 900 tons of continuous casting was carried out by blowing at a rate of 1.0β/lon while casting at a rate of 2.5 m/min. It was found that unlike the conventional method, almost no inclusions were attached. The drawing is a cross-sectional view showing the main parts of the continuous casting immersion nozzle 1 of the present invention, which includes through-holes 2 for blowing gas, which are made up of through-holes,
Gas flow path 3? The position of the 8tA discharge hole 4 is shown.
「発明の効果」
以上詳述したように、本発明の浸漬ノズルを使用し、所
定のガス量の吹込みを続行しながら連続鋳造を行なう場
合には、浸漬ノズルの内面に非金属介在物が付着する速
度は大幅に減速され、しかも、酸化物系介在物に起因す
る鋳片の欠陥発生も効果的に防止することが可能となっ
た。"Effects of the Invention" As detailed above, when continuous casting is performed using the immersion nozzle of the present invention while continuing to blow a predetermined amount of gas, non-metallic inclusions may occur on the inner surface of the immersion nozzle. The rate of adhesion was significantly reduced, and furthermore, it became possible to effectively prevent the occurrence of defects in slabs caused by oxide inclusions.
図面は本発明の連続鋳造用浸漬ノズルの要部を示す断面
図である。
１：浸漬ノズル、
２：貫通細孔、
３：ガス流路、
４：？容鋼吐出孔。The drawing is a sectional view showing a main part of the immersion nozzle for continuous casting of the present invention. 1: Immersion nozzle, 2: Through hole, 3: Gas flow path, 4: ? Steel discharge hole.
Claims (1)
に対し水平方向９０°の左右壁面中央部の、各々の吐出
孔中心線の交点を基準にして、その垂直上方に、幅５〜
３０ｍｍ、高さ３０〜１００ｍｍの範囲に０．１〜０．
５ｍｍφの貫通細孔を少なくとも片側に２個以上配設し
、浸漬ノズル壁体のガス流路に接続せしめたことを特徴
とする連続鋳造用浸漬ノズル。In a submerged nozzle having two discharge holes, a width of 5 to 5 mm is vertically above the intersection point of the center line of each discharge hole at the center of the left and right wall surfaces at 90° horizontally with respect to the discharge hole.
30mm, 0.1-0.
A submerged nozzle for continuous casting, characterized in that two or more through holes each having a diameter of 5 mm are arranged on at least one side and are connected to a gas flow path of a wall of the submerged nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30614488A JPH02151353A (en) | 1988-12-05 | 1988-12-05 | Submerged nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30614488A JPH02151353A (en) | 1988-12-05 | 1988-12-05 | Submerged nozzle for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02151353A true JPH02151353A (en) | 1990-06-11 |
Family
ID=17953584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30614488A Pending JPH02151353A (en) | 1988-12-05 | 1988-12-05 | Submerged nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02151353A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2313076A (en) * | 1996-05-17 | 1997-11-19 | Akechi Ceramics Kk | Long nozzle with gas passages for continuous casting |
| CN101905319A (en) * | 2010-08-05 | 2010-12-08 | 宜兴市耐火材料有限公司 | Steel pouring procedure and lower nozzle brick |
-
1988
- 1988-12-05 JP JP30614488A patent/JPH02151353A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2313076A (en) * | 1996-05-17 | 1997-11-19 | Akechi Ceramics Kk | Long nozzle with gas passages for continuous casting |
| GB2313076B (en) * | 1996-05-17 | 1999-10-13 | Akechi Ceramics Kk | Long nozzle for continuous casting |
| CN101905319A (en) * | 2010-08-05 | 2010-12-08 | 宜兴市耐火材料有限公司 | Steel pouring procedure and lower nozzle brick |
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