JPH0526737A - Thermocouple protection tube for thermometry of molten metal and its welding loss prevention method - Google Patents
Thermocouple protection tube for thermometry of molten metal and its welding loss prevention methodInfo
- Publication number
- JPH0526737A JPH0526737A JP20366291A JP20366291A JPH0526737A JP H0526737 A JPH0526737 A JP H0526737A JP 20366291 A JP20366291 A JP 20366291A JP 20366291 A JP20366291 A JP 20366291A JP H0526737 A JPH0526737 A JP H0526737A
- Authority
- JP
- Japan
- Prior art keywords
- protection tube
- sleeve
- molten metal
- thermocouple protection
- thermocouple
- 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.)
- Withdrawn
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶融金属の温度を連続
的に測定するための熱電対保護管およびその溶損防止方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermocouple protection tube for continuously measuring the temperature of molten metal and a method for preventing its melting loss.
【０００２】[0002]
【従来の技術】連続鋳造の操業においては、図４に示す
タンディッシュ４内溶融金属Ｍの温度をリアルタイムに
管理することが安定操業につながる。これは、タンディ
ッシュ４内の溶融金属Ｍの温度が基準値より低くなる
と、タンディッシュ４からモールド５への溶融金属Ｍの
供給を行っている浸漬ノズル６内溶融金属が冷却凝固し
て鋳造中止を引き起こす場合がある。 また、タンディ
ッシュ４内溶融金属Ｍの温度が基準値より高くなると、
モールド５内溶融金属の冷却が不十分となり鋳片表面に
二重肌が発生したり、ブレークアウトによる鋳造中止を
引き起こす場合がある。これらのトラブルを防止するた
めにはタンディッシュ４内溶融金属Ｍの温度を熱電対Ｎ
によって連続かつ長時間測温することが必要であるが、
この場合、熱電対保護管が溶損するため困難である。こ
の対策として、熱電対保護管にＡｌ2Ｏ3−Ｃ質又はＺｒ
Ｂ2質の耐火物からなるプロテクター（スリーブ）を装
着したものが特開平１−３２１３２７号公報によって知
られている。 図中８は取鍋である。また、熱電対保護
管の溶損防止方法としては、測温中に熱電対を昇降およ
び旋回させる方法が特開平１−２９９４２４号公報によ
って知られている。2. Description of the Related Art In continuous casting operation, controlling the temperature of the molten metal M in the tundish 4 shown in FIG. 4 in real time leads to stable operation. This is because when the temperature of the molten metal M in the tundish 4 becomes lower than the reference value, the molten metal in the immersion nozzle 6 which is supplying the molten metal M from the tundish 4 to the mold 5 is cooled and solidified and the casting is stopped. May cause. When the temperature of the molten metal M in the tundish 4 becomes higher than the reference value,
In some cases, the molten metal in the mold 5 is insufficiently cooled to cause double skin on the surface of the slab, or to stop casting due to breakout. In order to prevent these troubles, the temperature of the molten metal M in the tundish 4 is set to the thermocouple N.
It is necessary to measure temperature continuously and for a long time,
In this case, the thermocouple protection tube is melted and damaged, which is difficult. As a countermeasure against this, the thermocouple protection tube is made of Al 2 O 3 -C or Zr.
Japanese Patent Application Laid-Open No. 1-321327 discloses a protector (sleeve) made of B 2 quality refractory. In the figure, 8 is a ladle. Further, as a method for preventing melting damage of a thermocouple protection tube, a method of raising and lowering and turning a thermocouple during temperature measurement is known from JP-A-1-299424.
【０００３】[0003]
【発明が解決しようとする課題】しかし、Ａｌ2Ｏ3−Ｃ
質およびＺｒＢ2質の耐火物は溶融金属に対しては耐食
性は高いが、酸化物あるいは硫化物のような、いわゆる
スラグに対しては耐食性はさほど高くない。また、Ａｌ
2Ｏ3−Ｃ質およびＺｒＢ質の耐火物は高価であるためコ
スト高となるが、その割りには、耐用時間が短い。ま
た、熱電対を昇降および旋回させる方法は測温体の昇降
・旋回装置が必要であり、かつ該装置の設置ペースが狭
い場合は適用不可能である。However, Al 2 O 3 --C
Quality and ZrB 2 quality refractories have high corrosion resistance to molten metal, but not so high corrosion resistance to so-called slag such as oxides or sulfides. Also, Al
Refractory materials of 2 O 3 -C quality and ZrB quality are expensive and therefore costly, but the service life is short. Further, the method of raising and lowering and turning the thermocouple requires a device for raising and lowering the temperature measuring device and is not applicable when the pace of installation of the device is narrow.
【０００４】本発明は、熱電対保護管の寿命を低コスト
の耐火物によって有利に得ること及び熱電対保護管の昇
降及び旋回を不要とし、設置スペースの問題を解消する
ことを目的とする。It is an object of the present invention to advantageously obtain the life of a thermocouple protection tube with a low-cost refractory and to eliminate the need for raising and lowering and turning of the thermocouple protection tube, thereby solving the problem of installation space.
【０００５】[0005]
【課題を解決するための手段】本発明の熱電対保護管
は、溶融金属測温用の熱電対保護管の外周面に、ＭｇＯ
を７０重量％以上含有する耐火物質の円筒状スリーブを
取外し可能に装着したことを特徴とする。また、本発明
の熱電対保護管の溶損防止方法は連続鋳造において、タ
ンディッシュ内の溶融金属に熱電対保護管を浸漬し該溶
融金属の温度を連続して測定する際に、前記溶融金属の
湯面と前記スリーブとの接触位置を変更することを特徴
とする。The thermocouple protection tube of the present invention is characterized in that MgO is formed on the outer peripheral surface of the thermocouple protection tube for measuring the temperature of molten metal.
A cylindrical sleeve made of a refractory material containing 70% by weight or more is detachably attached. Further, the method for preventing melting damage of the thermocouple protection tube of the present invention, in continuous casting, when the thermocouple protection tube is immersed in the molten metal in the tundish to continuously measure the temperature of the molten metal, the molten metal The contact position between the molten metal surface and the sleeve is changed.
【０００６】[0006]
【作用】本発明の熱電対保護管は図１に示すように、熱
電対保護管１の外周面にＭｇＯを７０重量％以上含有す
る耐火物質円筒状のスリーブ２を取外し可能に装着した
ものである。熱電対保護管１にプロテクターとなるスリ
ーブ２を取外し可能に装着する方法としては、熱電対保
護管１にスリーブ２を嵌合するとともに、嵌合面をモル
タル３などによって接着する。また、スリーブ２を熱電
対保護管１から取外す方法としては、例えばスリーブ２
の端面に矢印Ａ方向の衝撃を加える。As shown in FIG. 1, the thermocouple protection tube of the present invention comprises a thermocouple protection tube 1 having an outer peripheral surface on which a cylindrical sleeve 2 of refractory material containing 70% by weight or more of MgO is detachably mounted. is there. As a method for detachably mounting the sleeve 2 serving as a protector on the thermocouple protection tube 1, the sleeve 2 is fitted to the thermocouple protection tube 1 and the fitting surface is bonded by a mortar 3 or the like. As a method for removing the sleeve 2 from the thermocouple protection tube 1, for example, the sleeve 2
A shock in the direction of arrow A is applied to the end face of.
【０００７】スリーブ２の材質はスラグに対する耐食性
が十分高いものが好ましいが、スリーブ２はタンディッ
シュと同時に使用することから、タンディッシュと同等
以上の寿命があれば十分である。タンディッシュの寿命
を決定しているのは、タンディッシュの内壁を構成する
耐火物であり、この内壁に通常使用されるＭｇＯ質耐火
物は、Ａｌ2Ｏ3−Ｃ質およびＺｒＢ2質の耐火物と比べ
て価格が１／１０〜１／１５であるのに対し、スラグに
対する耐溶損性がＡｌ2Ｏ3−Ｃ質およびＺｒＢ2質の耐
火物と比べて比較的大きいため耐用時間は１／８〜１／
１０である。図２は、ＭｇＯ−ＣａＯ系耐火物からなる
スリーブを装着した熱電対保護管を用いてタンディッシ
ュ内溶融金属の温度を連続して測定したときの、前記耐
火物に含まれるＭｇＯ重量％とスリーブの溶損指数の関
係を示す。The sleeve 2 is preferably made of a material having sufficiently high corrosion resistance against slag, but since the sleeve 2 is used at the same time as the tundish, it is sufficient if it has a life equal to or longer than that of the tundish. It is the refractory that constitutes the inner wall of the tundish that determines the life of the tundish. The MgO-based refractory that is commonly used for this inner wall is a refractory of Al 2 O 3 -C quality and ZrB 2 quality. Although the price is 1/10 to 1/15 of that of the refractory material, the corrosion resistance to slag is relatively larger than that of Al 2 O 3 -C quality and ZrB 2 quality refractory materials, so the service life is 1 / 8 to 1 /
It is 10. FIG. 2 shows the MgO weight% and the sleeve contained in the refractory when the temperature of the molten metal in the tundish was continuously measured using a thermocouple protection tube equipped with a sleeve made of a MgO-CaO refractory. 3 shows the relationship of the melt loss index.
【０００８】スリーブの耐火物に含まれるＭｇＯが７０
重量％未満では、スリーブの溶損が図２に示すように急
激に大きくなる。このため、ＭｇＯは７０重量％以上含
有することが必要である。なお、溶損指数とは溶損速度
２ｍｍ／ｈｒを１００とする値である。スリーブの厚み
ｔ2は熱電対保護管の厚みｔ1と同等とし、スリーブの長
さｌ2は熱電対保護管の長さｌ1に対して短くすることが
望ましい。また、スリーブの装着位置は熱電対保護管の
ほぼ中央部とすることが望ましい。MgO contained in the refractory material of the sleeve is 70
When the content is less than wt%, the melting loss of the sleeve rapidly increases as shown in FIG. Therefore, it is necessary to contain MgO in an amount of 70% by weight or more. The melt loss index is a value with a melt loss rate of 2 mm / hr as 100. It is desirable that the sleeve thickness t 2 be equal to the thermocouple protection tube thickness t 1 , and the sleeve length l 2 be shorter than the thermocouple protection tube length l 1 . Further, it is desirable that the mounting position of the sleeve is approximately in the center of the thermocouple protection tube.
【０００９】次に本発明による熱電対保護管の溶損を防
止する方法を説明する。連続鋳造においては、モールド
湯面レベルが変動すると溶融金属中への介在物の捲込あ
るいは鋳片表面の肌荒れが発生するので、湯面レベルの
変動を小さく抑える操業が行われている。このようにタ
ンディッシュ内の湯面レベルは一定になるようにコント
ロールされているために、タンディッシュ内の溶融金属
に熱電対保護管を浸漬すると熱電対保護管の限られた部
分が溶融金属浴面上のスラグと接触する。このため熱電
対保護管はスラグとの接触部が集中的に溶損されること
になり寿命が短くなる。Next, a method for preventing melting damage of the thermocouple protection tube according to the present invention will be described. In continuous casting, when the level of the molten metal surface fluctuates, the inclusion of inclusions in the molten metal or the surface of the slab is roughened, so that the operation of suppressing the fluctuation of the molten metal level is performed. In this way, the level of the molten metal in the tundish is controlled to be constant, so if the thermocouple protection tube is immersed in the molten metal in the tundish, the limited part of the thermocouple protection tube will melt the molten metal bath. Contact with slag on the surface. For this reason, the contact portion of the thermocouple protection tube with the slag is intensively melted and damaged, and the life is shortened.
【００１０】本発明は、これを防止するために、タンデ
ィッシュ内溶融金属の湯面と前記スリーブとの接触位置
を許容される範囲内で変更して保護管の局部溶損を防止
する。接触位置を変更する方法は、例えば図４に示す取
鍋ノズル７の開度を調整して湯面レベルを変更すること
によって行う。この方法によれば、タンディッシュ内の
湯面レベルを変更することによって達成できるので、熱
電対保護管の昇降装置および旋回装置等の特別な装置を
必要とせず好適である。図３はタンディッシュ内溶融金
属の温度をＭｇＯを７０重量％以上含有するスリーブを
装着した熱電対保護管によって測定する際の、該溶融金
属の湯面レベル変更量とスリーブの耐用時間の関係を示
す。なお、湯面レベルとは、タンディッシュ底面と溶融
金属湯面との距離である。In order to prevent this, the present invention changes the contact position between the molten metal surface of the molten metal in the tundish and the sleeve within an allowable range to prevent local melting damage of the protective tube. The contact position is changed by adjusting the opening of the ladle nozzle 7 shown in FIG. 4 to change the molten metal level. According to this method, since it can be achieved by changing the level of the molten metal in the tundish, it is preferable because no special device such as an elevating device and a turning device for the thermocouple protection tube is required. FIG. 3 shows the relationship between the level change amount of molten metal and the service life of the sleeve when the temperature of the molten metal in the tundish is measured by a thermocouple protection tube equipped with a sleeve containing 70 wt% or more of MgO. Show. The molten metal level is the distance between the tundish bottom surface and the molten metal molten metal surface.
【００１１】湯面レベル変更量が２００ｍｍ未満では、
スリーブは局部的な溶損によって耐用時間が短い。変更
量が８００ｍｍ超では、湯面レベルが低い時に溶融金属
中介在物の浮上が困難となり、該介在物がモールド内に
混入したり、湯面上のスラグがモールド内に混入する場
合がある。また、湯面レベルが高いときに、溶融金属温
度の不均一によって鋳片表面に二重肌が発生したり、ブ
レークアウトによる鋳造中止を引き起こしたりする場合
がある。このため、湯面レベル変更量は２００ｍｍ以
上、８００ｍｍ以下とすることが望ましい。また、前記
接触位置の変更は熱電対の位置を変更させてもよく、さ
らには組合せでもよい。熱電対と湯面レベルを相対的に
位置変更させることによって接触位置を変更させればよ
い。When the level change level is less than 200 mm,
The sleeve has a short service life due to local melting damage. If the amount of change exceeds 800 mm, it may be difficult to float inclusions in the molten metal when the level of the molten metal surface is low, and the inclusions may mix into the mold or slag on the molten metal surface may mix into the mold. In addition, when the level of the molten metal is high, a double skin may occur on the surface of the slab due to the uneven temperature of the molten metal, or the casting may be stopped due to breakout. Therefore, it is desirable that the level change amount of the molten metal is 200 mm or more and 800 mm or less. In addition, the contact position may be changed by changing the position of the thermocouple, or may be a combination. The contact position may be changed by relatively changing the thermocouple and the molten metal level.
【００１２】[0012]
(１)本発明の実施例として、Ａｌ2Ｏ3−Ｃ質耐火物の熱
電対保護管にＭｇＯを７５重量％、ＣａＯを１０重量％
含有する厚さ１０ｍｍ、長さ４００ｍｍの耐火物質円筒
状のスリーブを装着した熱電対保護管を連続鋳造中のタ
ンディッシュ内溶鋼に浸漬し、該溶鋼の温度を連続して
測定した。溶鋼温度は１４５０〜１５００℃であった。
この時、湯面レベルを３００ｍｍから６００ｍｍの範囲
で約４時間に１回変更した。浸漬時間２５ｈｒでスリー
ブが溶損したため、スリーブを同材質・同寸法の新しい
ものと交換し、熱電対保護管を次回チャンスに再使用し
た。次回チャンスの溶鋼温度は前回と同様であった。浸
漬時間２０ｈｒでスリーブを前回と同様に交換した。こ
のようにして熱電対保護管を４回使用した。熱電対保護
管は浸漬時間合計１００時間で溶損が大きくなり廃棄し
た。
(２)比較例として、上記実施例と同様の連続鋳造条件に
おいて、前記実施例と同様のスリーブおよび保護管を用
いた熱電対を連続鋳造中のタンディッシュ内溶鋼に浸漬
し、該溶鋼の温度を連続的に測定した。このとき、湯面
レベルは変更しなかった。浸漬時間５ｈｒでスリーブが
溶損したため、スリーブを新しいものと交換し、熱電対
保護管を次回チャンスに再使用した。浸漬時間は６ｈｒ
で前回と同様にスリーブを交換して熱電対保護管を再使
用したが浸漬時間合計２７ｈｒで熱電対保護管は溶損が
大きくなり廃棄した。(1) As an example of the present invention, 75% by weight of MgO and 10% by weight of CaO are contained in a thermocouple protection tube of an Al 2 O 3 -C refractory material.
A thermocouple protective tube equipped with a cylindrical sleeve containing a refractory material having a thickness of 10 mm and a length of 400 mm was immersed in the molten steel in the tundish during continuous casting, and the temperature of the molten steel was continuously measured. The molten steel temperature was 1450 to 1500 ° C.
At this time, the molten metal level was changed in the range of 300 mm to 600 mm about once every 4 hours. Since the sleeve was melted at the immersion time of 25 hours, the sleeve was replaced with a new one of the same material and size, and the thermocouple protection tube was reused at the next opportunity. The molten steel temperature at the next opportunity was the same as the previous time. At the immersion time of 20 hr, the sleeve was replaced as before. Thus, the thermocouple protection tube was used 4 times. The thermocouple protection tube was abandoned because its melting loss became large after a total immersion time of 100 hours. (2) As a comparative example, under the same continuous casting conditions as in the above example, a thermocouple using the same sleeve and protective tube as in the above example was dipped in the molten steel in the tundish during continuous casting to obtain the temperature of the molten steel. Was measured continuously. At this time, the surface level was not changed. Since the sleeve was melted at the immersion time of 5 hours, the sleeve was replaced with a new one, and the thermocouple protection tube was reused at the next opportunity. Immersion time is 6 hours
Then, as in the previous case, the sleeve was replaced and the thermocouple protection tube was reused, but after a total immersion time of 27 hours, the thermocouple protection tube suffered a large melting loss and was discarded.
【００１３】[0013]
【発明の効果】本発明の熱電対保護管は、その外周面に
ＭｇＯを７０重量％以上含有する耐火物質の円筒状スリ
ーブを脱着可能に装着したので、熱電対保護管の寿命を
低コストで有利に得ることができる。また、本発明の熱
電対保護管の溶損防止方法は、溶損位置を変えることに
よって溶損を分散化できるのでさらに長時間の測温を行
うことができる。In the thermocouple protection tube of the present invention, a cylindrical sleeve made of a refractory material containing 70% by weight or more of MgO is detachably attached to the outer peripheral surface of the thermocouple protection tube. It can be obtained advantageously. Further, according to the method for preventing melting loss of a thermocouple protection tube of the present invention, the melting loss can be dispersed by changing the melting loss position, so that the temperature can be measured for a longer time.
【図１】溶融金属測温用熱電対保護管にスリーブをモル
タルで接着した本発明の実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of the present invention in which a sleeve is bonded to a thermocouple protection tube for measuring a temperature of a molten metal with mortar.
【図２】スリーブのＭｇＯ含有重量％とスリーブの溶損
指数との関係を示す図である。FIG. 2 is a diagram showing the relationship between the MgO content wt% of the sleeve and the melting loss index of the sleeve.
【図３】湯面接触位置変更量とスリーブの耐用時間との
関係を示す図である。FIG. 3 is a diagram showing a relationship between a molten metal contact position change amount and a service life of a sleeve.
【図４】一般的な連続鋳造法を説明する図である。FIG. 4 is a diagram illustrating a general continuous casting method.
１ 熱電対保護管 ２ ＭｇＯ質耐火物円筒状のスリーブ ３ モルタル ４ タンディッシュ ５ モールド ６ 浸漬ノズル ７ 取鍋ノズル ８ 取鍋 Ｍ 溶融金属 Ｎ 熱電対 1 Thermocouple protection tube 2 MgO refractory cylindrical sleeve 3 mortar 4 tundish 5 mold 6 immersion nozzle 7 ladle nozzle 8 ladle M molten metal N thermocouple
Claims (2)
質の円筒状スリーブを、取外し可能に外周面に装着した
ことを特徴とする溶融金属測温用熱電対保護管。1. A thermocouple protective tube for measuring the temperature of a molten metal, wherein a cylindrical sleeve made of a refractory material containing 70% by weight or more of MgO is removably mounted on the outer peripheral surface.
溶融金属に熱電対保護管を浸漬し該溶融金属の温度を連
続して測定する際に、前記溶融金属測温用熱電対保護管
の外周面に装着したスリーブの範囲内で湯面とスリーブ
との接触位置を変更することを特徴とする熱電対保護管
の溶損防止方法。2. In continuous casting, when a thermocouple protection tube is immersed in the molten metal in a tundish and the temperature of the molten metal is continuously measured, the outer peripheral surface of the molten metal temperature measuring thermocouple protection tube is measured. A method for preventing melting damage of a thermocouple protection tube, characterized in that the contact position between the molten metal surface and the sleeve is changed within the range of the sleeve attached to the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20366291A JPH0526737A (en) | 1991-07-19 | 1991-07-19 | Thermocouple protection tube for thermometry of molten metal and its welding loss prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20366291A JPH0526737A (en) | 1991-07-19 | 1991-07-19 | Thermocouple protection tube for thermometry of molten metal and its welding loss prevention method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0526737A true JPH0526737A (en) | 1993-02-02 |
Family
ID=16477777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20366291A Withdrawn JPH0526737A (en) | 1991-07-19 | 1991-07-19 | Thermocouple protection tube for thermometry of molten metal and its welding loss prevention method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0526737A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08136352A (en) * | 1994-11-08 | 1996-05-31 | Tokyo Yogyo Co Ltd | Continuous immersion type thermometer |
| US5536359A (en) * | 1993-09-20 | 1996-07-16 | Hitachi, Ltd. | Semiconductor device manufacturing apparatus and method with optical monitoring of state of processing chamber |
-
1991
- 1991-07-19 JP JP20366291A patent/JPH0526737A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5536359A (en) * | 1993-09-20 | 1996-07-16 | Hitachi, Ltd. | Semiconductor device manufacturing apparatus and method with optical monitoring of state of processing chamber |
| JPH08136352A (en) * | 1994-11-08 | 1996-05-31 | Tokyo Yogyo Co Ltd | Continuous immersion type thermometer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981008 |