JP2000061594A - Gas blowing plug - Google Patents
Gas blowing plugInfo
- Publication number
- JP2000061594A JP2000061594A JP23315998A JP23315998A JP2000061594A JP 2000061594 A JP2000061594 A JP 2000061594A JP 23315998 A JP23315998 A JP 23315998A JP 23315998 A JP23315998 A JP 23315998A JP 2000061594 A JP2000061594 A JP 2000061594A
- Authority
- JP
- Japan
- Prior art keywords
- slit
- gas
- roughness
- plug
- blowing
- 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
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属溶湯にガスを
吹込むガス吹きプラグに関する。TECHNICAL FIELD The present invention relates to a gas blowing plug for blowing gas into a molten metal.
【０００２】[0002]
【従来の技術】溶鋼等の金属溶湯のトリベ処理において
は、不活性ガス等のガスを金属溶湯に吹込むことによ
り、金属溶湯の攪拌性を高めたり、脱ガスや脱硫などが
行われて、金属溶湯に対する処理が促進される。金属溶
湯へのガス吹込みは、トリベの炉床に配置された多数の
ガス吹きプラグによって行われている。2. Description of the Related Art In a ladle treatment of molten metal such as molten steel, a gas such as an inert gas is blown into the molten metal to improve agitation of the molten metal, degassing and desulfurization. The treatment of the molten metal is promoted. Gas injection into the molten metal is performed by a large number of gas injection plugs arranged in the hearth of the tribe.
【０００３】従来より、ガス吹きプラグは、ＬＦ、ＶＯ
Ｄ、ＣＡＳ−ＯＢ等のトリベ処理において、吹込通路が
多孔質れんがの開気孔であるポーラスプラグと、吹込通
路が軸芯と平行なスリットをもつ緻密れんが製のスリッ
トプラグとが多用されている。両プラグを比較すると、
耐用性とガス通気量の面でポーラスプラグよりスリット
プラグの方が優れている。Conventionally, gas blowing plugs have been LF and VO.
In a tribe process such as D or CAS-OB, a porous plug whose blowing passage is an open hole of a porous brick and a slit plug made of dense brick having a slit whose blowing passage is parallel to the axis are often used. Comparing both plugs,
Slit plugs are superior to porous plugs in terms of durability and gas flow rate.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
スリットタイプのガス吹きプラグは、スリットの表面粗
さを規定していないため、スリット内へ金属溶湯が浸入
しやすく、吹出しガス量が低下すると共に耐用性を悪化
し、浸入した金属溶湯が固まった地金によってスリット
からひび割れを誘発するという問題があった。However, since the conventional slit type gas blowing plug does not define the surface roughness of the slit, the molten metal easily intrudes into the slit, and the amount of blown gas decreases. There was a problem that the durability was deteriorated, and cracks were induced from the slits by the ingot of the infiltrated molten metal.
【０００５】スリット内への金属溶湯の浸入を阻止する
には、スリットの厚みを小さくすればよいが、スリット
の厚みを小さくすると、ガスの通気量が犠牲になる。本
発明は、スリットへの金属溶湯の浸入を防止し、ガスの
通気量を確保したスリットタイプのガス吹きプラグを提
供することを解決すべき課題とする。In order to prevent the molten metal from entering the slit, the thickness of the slit may be reduced, but if the thickness of the slit is reduced, the gas permeation amount is sacrificed. An object of the present invention is to provide a slit-type gas blowing plug that prevents the molten metal from penetrating into the slit and secures the gas flow rate.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決すべく本
発明の発明者等は種々検討を重ね、スリット内へ金属溶
湯が浸入する現象を究明し、スリットを区画する内壁面
の表面粗さに注目して種々の条件で調査を行った。その
結果、スリットの内壁面の表面粗さによって金属溶湯の
浸入が影響されることをつきとめ本発明を完成するに至
った。Means for Solving the Problems To solve the above problems, the inventors of the present invention have made various investigations, and have investigated the phenomenon that the molten metal infiltrates into the slits to determine the surface roughness of the inner wall surface defining the slits. Attention was paid to and was investigated under various conditions. As a result, the inventors have found that the intrusion of the molten metal is affected by the surface roughness of the inner wall surface of the slit, thus completing the present invention.
【０００７】すなわち、本発明は、金属溶湯にガスを吹
込む吹込通路として軸方向に延びるスリット通路をもつ
ガス吹きプラグであって、前記スリット通路を区画する
内壁面の表面粗さが、平均粗さが１．９〜３．７μｍの
範囲であることを特徴とする。 前記スリット通路を区
画する内壁面の表面粗さは、最大粗さが２６．５〜５
９．２μｍの範囲であることが好ましい。That is, the present invention is a gas blowing plug having a slit passage extending in the axial direction as a blowing passage for blowing gas into a molten metal, wherein the surface roughness of the inner wall surface defining the slit passage has an average roughness. Is in the range of 1.9 to 3.7 μm. The surface roughness of the inner wall surface defining the slit passage has a maximum roughness of 26.5 to 5
It is preferably in the range of 9.2 μm.
【０００８】ここで、平均粗さとは、基準長さ分の前記
断面曲線のうち波長の長い成分を除去して得られる粗さ
曲線の算術平均である。最大粗さとは、内壁面の断面曲
線から基準長さをとり、この基準長さの範囲で最小谷底
を結んだ仮想平滑面からの各山頂の高さを計測したもの
である。Here, the average roughness is an arithmetic mean of roughness curves obtained by removing long wavelength components from the cross-section curve corresponding to the reference length. The maximum roughness is obtained by taking a reference length from the cross-section curve of the inner wall surface and measuring the height of each peak from an imaginary smooth surface connecting the minimum valley bottoms within this reference length range.
【０００９】[0009]
【作用効果】本発明のガス吹きプラグでは、スリット通
路を区画する内壁面の表面平均粗さを上記値の範囲とす
ることにより、金属溶湯がスリット内壁面凹凸の凹部に
浸入しスリット通路の軸方向深くへ金属溶湯が浸入する
のが抑えられ、ガスの通気量を確保することができる。In the gas blowing plug of the present invention, by setting the surface average roughness of the inner wall surface that defines the slit passage within the above range, the molten metal penetrates into the concave portion of the slit inner wall irregularity and It is possible to prevent the molten metal from penetrating deeper in the direction, and to secure a gas permeation amount.
【００１０】スリット通路を区画する内壁面の表面粗さ
は、できるだけ凹凸に富んでいることが好ましい。凹凸
に富んでいることにより、凹部に浸入する金属溶湯の量
が多くなり、スリット通路の軸方向深くへ浸入する金属
溶湯を一層抑えることができる。The surface roughness of the inner wall surface defining the slit passage is preferably as uneven as possible. Since the unevenness is rich, the amount of the molten metal that penetrates into the recess increases, and the molten metal that penetrates deep into the slit passage in the axial direction can be further suppressed.
【００１１】[0011]
【発明の実施の形態】本発明のガス吹きプラグは、ガス
を金属溶湯に吹込むことにより、金属溶湯に対する処理
（脱ガス処理、脱炭処理、脱硫処理等）を促進するもの
であり、例えば転炉から連続鋳造へ金属溶湯を移送する
トリベ処理に有効となる。吹込通路としてのスリット通
路の数は、特に限定されないが、一般的には複数本設け
られている。複数本のスリット通路は、放射状あるいは
円陣状等が考えられる。BEST MODE FOR CARRYING OUT THE INVENTION The gas-blowing plug of the present invention promotes treatment (degassing treatment, decarburizing treatment, desulfurization treatment, etc.) on a molten metal by blowing gas into the molten metal. It is effective for the tribe process that transfers the molten metal from the converter to the continuous casting. The number of slit passages as blowing passages is not particularly limited, but a plurality of slit passages are generally provided. The plurality of slit passages may be radial or circular.
【００１２】スリット通路の幅は、１０mm程度、厚み
は、０．２５mm程度が好ましい。この幅と厚みのスリッ
ト通路で上記表面粗さのとき、金属溶湯の浸入が阻止さ
れる割合が最も良いことが、ガス通気量と閉塞率（プラ
グ軸方向の所定深さでの目詰り率）の測定結果から明ら
かになった。本発明のガス吹きプラグは、焼失板材をス
リット通路形成材として用い、流動性をもつ緻密れん
が、例えばハイアルミナ質キャスタブル耐火材を焼失板
材の外側に流し込んで成形し、耐火材が固化後、加熱に
より焼失板材を焼失させるこにより形成できる。The width of the slit passage is preferably about 10 mm and the thickness thereof is preferably about 0.25 mm. When the surface roughness is the above in the slit passage of this width and thickness, it is best that the penetration of the molten metal is prevented, and the gas permeation rate and the clogging rate (clogging rate at a predetermined depth in the axial direction of the plug). It became clear from the measurement result of. The gas blown plug of the present invention uses a burnt board material as a slit passage forming material, and a dense brick having fluidity is cast, for example, by casting a high alumina castable refractory material on the outside of the burnt board material, and after the refractory material solidifies, it is heated. Can be formed by burning out the burned plate material.
【００１３】焼失板材は、表面を平滑にした紙等の芯材
と、該芯材の両面に接合された凹凸表皮材とから構成す
ることができる。この凹凸表皮材の粗さを調整すること
により、本発明の表面粗さが平均粗さで１．９〜３．７
μｍの範囲、最大粗さで２６．５〜５９．２μｍの範囲
のスリット通路を形成することができる。凹凸表皮材
は、薄膜の上に本発明の表面粗さを実現する粒子径の粒
材を吹付けて構成することができる。また、芯材の表面
に接着材を塗布し、その上に粒材を吹付けてもよい。こ
の場合、薄膜も粒材も焼失材である。The burned-off plate material can be composed of a core material such as paper having a smooth surface and an uneven skin material joined to both surfaces of the core material. By adjusting the roughness of the uneven surface material, the surface roughness of the present invention is 1.9 to 3.7 in terms of average roughness.
It is possible to form a slit passage having a maximum roughness of 26.5 to 59.2 μm in the range of μm. The uneven skin material can be formed by spraying a granular material having a particle diameter that achieves the surface roughness of the present invention on the thin film. Alternatively, an adhesive material may be applied to the surface of the core material, and the granular material may be sprayed thereon. In this case, both the thin film and the granular material are burnt out materials.
【００１４】[0014]
【実施例】次に本発明のガス吹きプラグの実施例を図１
〜図４を参照しつつ説明する。ガス吹きプラグ１は、図
１に示すように、円錐台形状の耐火物１０と、該耐火物
１０を被覆する鉄皮１２とで構成されており、単体では
耐火物１０の上面に吊下げ用の鉄製フック１３が取付け
られている。EXAMPLE An example of the gas blowing plug of the present invention is shown in FIG.
-It demonstrates, referring FIG. As shown in FIG. 1, the gas blowing plug 1 is composed of a truncated cone-shaped refractory material 10 and a steel shell 12 that covers the refractory material 10. As a single unit, it is for hanging on the upper surface of the refractory material 10. The iron hook 13 is attached.
【００１５】耐火物１０の下面にはガスプール部１４が
形成されている。ガスプール部１４は、鉄皮１２に一体
的に保持された底金１５と、底金１５の外縁と耐火物１
０の下面との間に介装されたスペーサリング１６とで区
画され、ガスプール部１４は、スペーサリング１６の厚
み分の空間として形成されている。底金１５には、導管
１７が接続され、該導管１７には図示しないガス供給装
置が接続される。A gas pool portion 14 is formed on the lower surface of the refractory material 10. The gas pool portion 14 includes a bottom metal 15 integrally held by the steel shell 12, an outer edge of the bottom metal 15 and the refractory material 1.
The gas pool portion 14 is defined as a space corresponding to the thickness of the spacer ring 16 and is partitioned by the spacer ring 16 interposed between the spacer ring 16 and the lower surface of the spacer ring 16. A conduit 17 is connected to the bottom metal 15, and a gas supply device (not shown) is connected to the conduit 17.
【００１６】ところで、耐火物１０には、ガス吹きプラ
グ１の軸方向に形成されたスリット通路１８がその幅方
向を放射状に整列して複数形成されている。スリット通
路１８は、耐火物１０の下面から上面に貫通しており、
その長さＬが耐火物１０の軸方向長さ２７０mmに等し
く、また、図１のＡ−Ａ線断面を示す図２に示すよう
に、その周方向の厚みｔが０．２５mm、幅ｗ（径方向の
長さ）が１０mmとされている。 上記スリット通路１８
は、該スリット通路１８を区画する内壁面の表面粗さ
が、平均粗さで２．３μm、最大粗さＲmax=３６．９μm
に設定されている。ここで、最大粗さは、内壁面の断面
曲線から基準長さをとり、この基準長さの範囲で最小谷
底を結んだ仮想平滑面からの各山頂の高さを計測したも
のである。平均粗さは、基準長さ分の前記断面曲線のう
ち波長の長い成分を除去して得られる粗さ曲線の算術平
均を計算したものである。By the way, in the refractory material 10, a plurality of slit passages 18 formed in the axial direction of the gas blowing plug 1 are radially arranged in the width direction. The slit passage 18 penetrates from the lower surface to the upper surface of the refractory material 10,
The length L is equal to the axial length 270 mm of the refractory material 10. Further, as shown in FIG. 2 showing a cross section taken along the line AA of FIG. 1, its circumferential thickness t is 0.25 mm and width w ( The radial length) is set to 10 mm. The slit passage 18
Has an average surface roughness of 2.3 μm and a maximum roughness Rmax = 36.9 μm.
Is set to. Here, the maximum roughness is obtained by taking the reference length from the cross-sectional curve of the inner wall surface and measuring the height of each peak from an imaginary smooth surface connecting the minimum valley bottoms within this reference length range. The average roughness is calculated by calculating the arithmetic mean of roughness curves obtained by removing long wavelength components from the cross-section curve corresponding to the reference length.
【００１７】上記ガス吹きプラグは以下のように製作し
た。耐火物１０はハイアルミナ質キャスタブルを用い
た。具体的に、ＳｉＯ2３重量％、Ａｌ2Ｏ3８９．５重
量％、ＣａＯ１．５重量％、ＭｇＯ４．０重量％のもの
を用いた。スリット通路１８の形成は、図３に示すよう
に、表面を平滑にした紙からなる芯材１９と、該芯材１
９の表面に最大粗さＲmax=３６．９μm以下、平均粗さ
がＲａ=２．３μmに設定された凹凸表皮材２０を貼設し
た焼失板材２１をスリット通路形成材として用いて行っ
た。焼失板材２１は芯材１９及び凹凸表皮材２０の長さ
が２７０mmより長いものとした。芯材１９の厚みは０．
２５mm、幅ｗは１０mmとした。The above gas blow plug was manufactured as follows. As the refractory material 10, a high alumina castable material was used. Specifically, those having 3 wt% of SiO 2 , 89.5 wt% of Al 2 O 3 , 1.5 wt% of CaO and 4.0 wt% of MgO were used. As shown in FIG. 3, the slit passage 18 is formed by a core material 19 made of paper with a smooth surface and the core material 1
The burned plate material 21 having the uneven surface material 20 having the maximum roughness Rmax of 36.9 μm or less and the average roughness Ra of 2.3 μm adhered on the surface of No. 9 was used as the slit passage forming material. The burned-out plate material 21 has a length of the core material 19 and the uneven skin material 20 longer than 270 mm. The thickness of the core material 19 is 0.
The width was 25 mm and the width w was 10 mm.
【００１８】成形型への焼失板材２１のセットは、該焼
失板材２１の端をフックで引っかけた状態で成形型内に
吊下げた。この後、ハイアルミナ質キャスタブルの流体
を成形型内に流し込んだ。この場合、焼失板材２１がよ
じれないように、該焼失板材２１を位置規制するため、
成形型の底部で焼失板材の下端を固定した。上記のよう
に焼失板材２１が流動耐火物内に埋め込まれた成形型
は、焼成工程により所定温度で加熱した。これにより、
耐火物１０が形成されると共に、焼失板材２１が焼失し
て、表面粗さが本実施例の値のスリット通路１８を形成
することができた。The burned plate material 21 was set in the mold with the end of the burned plate material 21 hooked by a hook and suspended in the mold. After this, a high alumina castable fluid was poured into the mold. In this case, the position of the burned plate material 21 is regulated so that the burned plate material 21 is not twisted.
The bottom of the burned plate was fixed at the bottom of the mold. The mold in which the burned-off plate material 21 was embedded in the fluid refractory material as described above was heated at a predetermined temperature in the firing process. This allows
As the refractory material 10 was formed, the burned-off plate material 21 was burnt off, and the slit passage 18 having the surface roughness of the value of this embodiment could be formed.
【００１９】更にスリット通路１８が形成された耐火物
１０の外周に鉄皮１２を巻付け、耐火物１０の下面にス
ペーサリング１６を挟んで底金１５を設置し、底板１５
と鉄皮１２の下端とを溶接して、本ガス吹きプラグ１を
完成した。次に上記ガス吹きプラグ１の性能を確認する
ため、供試品として、ポーラスプラグ（従来例）と、耐
火材は本ガス吹きプラグ１の耐火材と同じ材質で、スリ
ット通路１８の表面粗さを異ならせたもの２点を用意し
た。ポーラスプラグの表面粗さ（任意の断面での表面粗
さ）は、最大粗さ１５．１μm以下、平均粗さ１．５μm
である。スリット通路１８の表面粗さを異ならせた比較
例１は、表面粗さが最大粗さ２６．５μm以下、平均粗
さ１．９μmのものであり、比較例２は表面粗さが最大
粗さ５９．２μm以下、平均粗さ３．７μm以上のものと
した。なお、スリット通路１８の個数は各比較例１、２
及び実施例共に１６個とした。Further, an iron skin 12 is wound around the outer periphery of the refractory 10 in which the slit passage 18 is formed, and a bottom metal 15 is installed on the lower surface of the refractory 10 with a spacer ring 16 sandwiched therebetween.
The lower end of the iron shell 12 was welded to complete the gas blowing plug 1. Next, in order to confirm the performance of the gas blowing plug 1, as a sample, a porous plug (conventional example), the refractory material is the same as the refractory material of the gas blowing plug 1, and the surface roughness of the slit passage 18 is I prepared two different items. The surface roughness of the porous plug (surface roughness on any cross section) is maximum roughness 15.1 μm or less, average roughness 1.5 μm.
Is. Comparative Example 1 in which the surface roughness of the slit passage 18 is different has a maximum surface roughness of 26.5 μm or less and an average surface roughness of 1.9 μm, and Comparative Example 2 has a maximum surface roughness. The average roughness was 59.2 μm or less and the average roughness was 3.7 μm or more. The number of slit passages 18 is the same as that in each of Comparative Examples 1 and 2.
Also, the number was set to 16 in each of the examples.
【００２０】これらの各供試品を回転浸食炉に使用して
以下の試験を行った。
（通気量試験）図６は、各供試品の通気量試験の結果を
示す。縦軸は、通気量であり、単位は毎分のガス量（リ
ットルＬ）である。横軸は、導管１７から送るガスの圧
力値を表し、単位はkg/cmである。The following tests were carried out by using each of these specimens in a rotary erosion furnace. (Ventilation test) FIG. 6 shows the results of the ventilation test of each sample. The vertical axis represents the ventilation amount, and the unit is the gas amount per minute (liter L). The horizontal axis represents the pressure value of the gas sent from the conduit 17, and the unit is kg / cm.
【００２１】表１からわかるように、従来例のポーラス
プラグでの測定結果をプロットとした□印の曲線は、圧
力に比例して通気量が多くなっている。そして、従来例
の測定結果に実施例（△印でプロット）のガス吹きプラ
グ１と、比較例１（○印でプロット）のものがほぼ等し
くなっている。これに対し、表面粗さを実施例より大き
くした比較例２（×印でプロット）のものも、圧力に比
例して通気量は多くなっているが、その割合が小さい。
すなわち、比較例２のものは、実施例やポーラスプラグ
及び比較例１のものに対し通気量が少ない。As can be seen from Table 1, in the curve marked with □, which plots the measurement results of the porous plug of the conventional example, the ventilation amount increases in proportion to the pressure. The measurement results of the conventional example are almost the same for the gas blow plug 1 of the embodiment (plotted with a mark) and that of the comparative example 1 (plotted with a mark). On the other hand, also in Comparative Example 2 (plotted with a mark X) in which the surface roughness is larger than that of the example, the ventilation amount increases in proportion to the pressure, but the ratio is small.
That is, the air flow rate of the comparative example 2 is smaller than that of the example, the porous plug and the comparative example 1.
【００２２】（閉塞率試験）図７は各供試品の金属溶湯
の浸入状態（閉塞率）試験の結果を示す。縦軸は、スリ
ット通路１８の閉塞率を表し、単位は入力ガス量に対す
る吹き出しガス量の百分率％である。横軸は、金属溶湯
と接触する耐火物１２の上面からの深さ（切断位置）を
表す。単位はmmである。(Clogging Rate Test) FIG. 7 shows the results of the infiltration state (clogging rate) test of the molten metal of each sample. The vertical axis represents the blocking rate of the slit passage 18, and the unit is the percentage of the blown-out gas amount with respect to the input gas amount. The horizontal axis represents the depth (cutting position) from the upper surface of the refractory material 12 in contact with the molten metal. The unit is mm.
【００２３】閉塞率の測定は、金属溶湯が固化してスリ
ット通路を塞ぐように付着した地金の状態をスリット通
路を拡大した画像により、その面積の百分率を計算した
ものである。表２からわかるように、従来例（□印でプ
ロット）のポーラスプラグでの測定結果の曲線は、スリ
ット通路が深くなるほど閉塞率が小さくなっている。耐
火物１２の上面での閉塞率が１００％となっていても、
この上面でに付着した地金は新たな金属溶湯によって除
去されるので問題はない。The clogging rate is measured by calculating the percentage of the area of the state of the metal which is adhered so that the molten metal solidifies and blocks the slit passage, by using an enlarged image of the slit passage. As can be seen from Table 2, in the curve of the measurement result of the porous plug of the conventional example (plotted with □), the blocking rate becomes smaller as the slit passage becomes deeper. Even if the blocking rate on the upper surface of the refractory material 12 is 100%,
There is no problem because the metal that adheres to the upper surface is removed by new molten metal.
【００２４】この従来例の閉塞率曲線に対し、比較例１
（○印でプロット）のものは、切断位置が深くなる程閉
塞率が小さくなる割合がポーラスプラグより急になって
いる。すなわち、スリットプラグとすることにより、閉
塞率がポーラスプラグより改善されている。そして、実
施例（△印でプロット）のガス吹きプラグ１では、比較
例１より更に閉塞率が小さくなる割合が急になってお
り、閉塞率が改善されることがわかる。 スリット通路
の表面粗さが実施例より粗い比較例２（×印でプロッ
ト）のものでは、５〜１５mmの範囲の切断位置での閉塞
率が実施例より良く、２０mmの切断位置で本実施例とほ
ぼ同じである。Comparative Example 1 is compared with the blockage rate curve of this conventional example.
In the case of (marked with a circle), the closer the cutting position is, the smaller the clogging rate is than the porous plug. That is, by using the slit plug, the blocking rate is improved as compared with the porous plug. Then, in the gas blowing plug 1 of the example (plotted with a triangle mark), the rate at which the clogging rate becomes smaller than that of the comparative example 1 becomes steep, and it is understood that the clogging rate is improved. In Comparative Example 2 (plotted with a mark X) in which the surface roughness of the slit passage is rougher than that of the example, the blocking rate at the cutting position in the range of 5 to 15 mm is better than that of the example, and the cutting position of this example is 20 mm. Is almost the same as.
【００２５】以上の試験結果より本発明のガス吹きプラ
グ１では、ポーラスプラグに対し実施例の表面粗さから
比較例１の表面粗さの範囲が、通気量の点で良好であ
り、実施例の表面粗さから比較例２の表面粗さの範囲
が、閉塞率の点で良好であることがわかった。従って、
スリット通路１８の内壁面における平均粗さが１．９〜
３．７の範囲、最大粗さが２６．５〜５９．２μｍの範
囲の表面粗のガス吹きプラグとすることにより、スリッ
ト通路１８の閉塞が抑えられ、ガスの通気量を確保する
ことができた。これらのガス吹きプラグによれば、スリ
ットプラグにより耐スポーリング性が良好であることが
期待できる。From the above test results, in the gas blown plug 1 of the present invention, the range of the surface roughness of the example to the surface roughness of the comparative example 1 is good in terms of ventilation amount with respect to the porous plug. It was found from the surface roughness of Comparative Example 2 that the range of the surface roughness is good in terms of the clogging rate. Therefore,
The average roughness on the inner wall surface of the slit passage 18 is 1.9 to
By using a gas blowing plug having a surface roughness of 3.7 in the range of 26.5 to 59.2 μm in maximum roughness, the clogging of the slit passage 18 can be suppressed, and the gas permeation amount can be secured. It was According to these gas blowing plugs, it can be expected that the slit plug has good spalling resistance.
【００２６】そして、特に実施例のガス吹きプラグで
は、通気量及び閉塞率が共に良好であることがわかっ
た。本ガス吹きプラグ１は、ＬＦ、ＶＯＤ、ＣＡＳ−Ｏ
Ｂ等のトリベの耐火壁に埋設して用いることができる。
ガス吹きプラグ１からトリベ内に吹出すガスは、該トリ
ベ内の加熱された金属溶湯に吹出し、金属溶湯を攪拌
し、スラグと金属溶湯との反応性を高める。Further, it was found that the gas blowing plugs of the examples had particularly good air permeation rates and blockage rates. The gas blowing plug 1 is LF, VOD, CAS-O.
It can be used by embedding it in a fire wall of a trivet such as B.
The gas blown from the gas blowing plug 1 into the trowel blows to the heated metal melt in the trolley, agitates the metal melt, and enhances the reactivity between the slag and the metal melt.
【００２７】本発明の第２実施例として、スリット通路
は、図４に示すように、耐火物１０の周方向に幅方向を
一致させたスリット通路２２を複数形成したものや、図
５に示すように、該スリット通路２２と第１実施例と同
様に放射状に配置したスリット通路１８とを併用しても
よい。このように放射状に配置したスリット通路１８と
周方向に幅方向を一致させたスリット通路２２とを併用
することにより、放射状だけのスリット通路１８や周方
向だけのスリット通路２２から吹出す場合に比し、耐火
物１０の上面からのガスの流れに変化をもたせることが
でき、攪拌性等の向上を期待できる。As a second embodiment of the present invention, as shown in FIG. 4, the slit passage is formed by forming a plurality of slit passages 22 whose width directions match the circumferential direction of the refractory material 10, and FIG. As described above, the slit passages 22 and the slit passages 18 radially arranged as in the first embodiment may be used together. By using the slit passages 18 radially arranged in this manner and the slit passages 22 whose width direction coincides with the circumferential direction in combination, the slit passages 18 only in the radial direction or the slit passages 22 only in the circumferential direction are blown out. However, the flow of gas from the upper surface of the refractory material 10 can be changed, and improvement in stirring properties and the like can be expected.
【図１】 本発明のガス吹きプラグを示す断面図であ
る。FIG. 1 is a sectional view showing a gas blowing plug of the present invention.
【図２】 図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】 スリット通路を形成するための焼失板材を示
す図である。FIG. 3 is a diagram showing a burnt-off plate material for forming a slit passage.
【図４】 他の実施例に係るガス吹きプラグを示す断面
図である。FIG. 4 is a sectional view showing a gas blowing plug according to another embodiment.
【図５】 更に他の実施例に係るガス吹きプラグを示す
断面図である。FIG. 5 is a sectional view showing a gas blowing plug according to still another embodiment.
【図６】 実施例の発明品と比較例の通気量試験の結果
を示す図である。FIG. 6 is a diagram showing the results of the air flow rate test of the invention product of the example and the comparative example.
【図７】 実施例の発明品と比較例の閉塞率量試験の結
果を示す図である。FIG. 7 is a diagram showing the results of blockage rate amount tests of the invention product of the example and the comparative example.
１…ガス吹きプラグ、１０…耐火物、１２…鉄皮、１４
…ガスプール部、１７…導管、１８…スリット通路、１
９…芯材、２０…凹凸表皮材、２１…焼失板材。1 ... Gas blow plug, 10 ... Refractory material, 12 ... Iron skin, 14
… Gas pool part, 17… Conduit, 18… Slit passage, 1
9 ... Core material, 20 ... Uneven surface material, 21 ... Burned board material.
Claims (2)
軸方向に延びるスリット通路をもつ緻密れんが製のガス
吹きプラグであって、 前記スリット通路を区画する内壁面の表面粗さは、平均
粗さが１．９〜３．７μｍの範囲であることを特徴とす
るガス吹きプラグ。1. A gas blowing plug made of dense brick having a slit passage extending in the axial direction as a blowing passage for blowing gas into the molten metal, wherein the surface roughness of the inner wall surface defining the slit passage has an average roughness. The gas-blowing plug has a size of 1.9 to 3.7 μm.
面粗さは、最大粗さが２６．５〜５９．２μｍの範囲で
ある請求項１記載のガス吹きプラグ。2. The gas blowing plug according to claim 1, wherein the maximum roughness of the inner wall surface defining the slit passage is in the range of 26.5 to 59.2 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23315998A JP3824119B2 (en) | 1998-08-19 | 1998-08-19 | Gas blow plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23315998A JP3824119B2 (en) | 1998-08-19 | 1998-08-19 | Gas blow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000061594A true JP2000061594A (en) | 2000-02-29 |
| JP3824119B2 JP3824119B2 (en) | 2006-09-20 |
Family
ID=16950654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23315998A Expired - Fee Related JP3824119B2 (en) | 1998-08-19 | 1998-08-19 | Gas blow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3824119B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1077266A3 (en) * | 1999-08-19 | 2002-11-13 | Tokyo Yogyo Kabushiki Kaisha | Gas blowing plug and manufacturing method therefor |
| JP2010159460A (en) * | 2009-01-08 | 2010-07-22 | Tokyo Yogyo Co Ltd | Lance pipe |
| CN113199019A (en) * | 2021-05-19 | 2021-08-03 | 洛阳全通窑业有限公司 | Slit air flue air brick and production method thereof |
| US11959813B2 (en) | 2020-06-22 | 2024-04-16 | Heraeus Electro-Nite International N.V. | Device and method for measuring a temperature of a molten metal |
-
1998
- 1998-08-19 JP JP23315998A patent/JP3824119B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1077266A3 (en) * | 1999-08-19 | 2002-11-13 | Tokyo Yogyo Kabushiki Kaisha | Gas blowing plug and manufacturing method therefor |
| US6551550B1 (en) | 1999-08-19 | 2003-04-22 | Tokyo Yogyo Kabushiki Kaisha | Gas blowing plug and manufacturing method therefor |
| JP2010159460A (en) * | 2009-01-08 | 2010-07-22 | Tokyo Yogyo Co Ltd | Lance pipe |
| US11959813B2 (en) | 2020-06-22 | 2024-04-16 | Heraeus Electro-Nite International N.V. | Device and method for measuring a temperature of a molten metal |
| CN113199019A (en) * | 2021-05-19 | 2021-08-03 | 洛阳全通窑业有限公司 | Slit air flue air brick and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3824119B2 (en) | 2006-09-20 |
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