JPS59145722A - Cooling method of lance for stirring molten metal - Google Patents
Cooling method of lance for stirring molten metalInfo
- Publication number
- JPS59145722A JPS59145722A JP1885483A JP1885483A JPS59145722A JP S59145722 A JPS59145722 A JP S59145722A JP 1885483 A JP1885483 A JP 1885483A JP 1885483 A JP1885483 A JP 1885483A JP S59145722 A JPS59145722 A JP S59145722A
- Authority
- JP
- Japan
- Prior art keywords
- lance
- pipe
- stirring
- molten metal
- refractories
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、溶融金属の攪拌及び精錬処理に使用される耐
火物被覆ランスの使用方法に関するもので、該ランスの
中心にある金属管を処理後効果的に冷却し、もって2ン
スの耐用寿命の向上を図ることを目的としている。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of using a refractory-coated lance used for stirring and refining molten metal, in which a metal tube in the center of the lance is effectively cooled after processing; The purpose of this is to improve the useful life of the 2-unit.
一般に攪拌ランスと呼ばれているガス吹込みのだめの金
属管の外側を耐火物で被覆した耐火物被覆ランス(以下
単にランスという)は、概略第2図に示す如き構造のも
のであり、第1図に模式的に示す如く取鍋等精錬容器内
の溶融金属中に浸漬し、攪拌のだめのガス又は精錬のだ
めのガス及び多ラックスを吹込んで、溶融金属の攪拌及
び精錬を行うために使用されている。第1〜2図におい
て、符号(1)は取鍋であり、(2)はその蓋であり、
(3)は撹拌ランスであり、(4)は溶鉄であり、(5
)はその上に浮上しているスラグであp、(61は前記
攪拌ランス(りからガスを吹込んだ場合の〕(ブリング
を図示したものである。又、(7)は前Mek拌ラフラ
ノスリ属管であり、(7’)はそのガス通過孔であ]、
(8)はその外側に被覆した被覆耐火物であり、(9)
は7ラノジである。A refractory-coated lance (hereinafter simply referred to as a lance), in which the outside of a metal tube for gas injection, which is generally called a stirring lance, is coated with a refractory, has a structure roughly shown in Fig. 2. As schematically shown in the figure, it is used to stir and refine the molten metal by immersing it in the molten metal in a refining container such as a ladle and blowing stirring tank gas or refining tank gas and polylux. There is. In Figures 1 and 2, the symbol (1) is a ladle, and (2) is its lid;
(3) is a stirring lance, (4) is molten iron, and (5
) is the slag floating above it, (61 is the stirring lance when gas is blown into it). (7' is the gas passage hole)
(8) is a coated refractory coated on the outside, and (9)
is 7 Ranoji.
第1表
第1表はランスの一般的な使用条件を示したものであυ
、斯かる条件において従来何らの冷却方法をも講じない
場合のランスの耐用寿命は、後に第2表に示す如く溶鋼
で平却28回であったーそのためコスト比が高くなると
いう問題があり、改善が要望されていた。Table 1 Table 1 shows the general usage conditions of lances.
Under such conditions, the service life of a lance without any conventional cooling method was 28 times with molten steel, as shown in Table 2.Therefore, there was a problem of high cost ratio. Improvements were requested.
発明者らは、このランスの耐用寿命が短いこ゛との原因
を明らかにするため、被覆耐火物の温度変化や金属管の
曲り等について究明した。その結果を第3図に示す。図
中に示す熱膨張曲線は、実測温度と耐火物及び熱膨張率
とより計算によシ求めたものである。図中に見られるよ
うに、処理後に表われる温度の極太値は、耐火物と金属
管とで時間差があり、金属管は遅れて極太となる。その
ため、膨張曲線は図に示すように金属管の熱膨張率が耐
火物に比べて約15倍と大きいだめ、前記の温度カーブ
の遅れと和俟って、より膨張差は大きくなる。これによ
シ耐火物と金属管との間に物理的な歪を生じ、耐火物の
亀裂、剥離と金属管の曲りが発生することを知った。In order to clarify the cause of the short service life of this lance, the inventors investigated the temperature change of the coated refractory, the bending of the metal tube, etc. The results are shown in FIG. The thermal expansion curve shown in the figure was obtained by calculation from the measured temperature, the refractory material, and the coefficient of thermal expansion. As can be seen in the figure, there is a time difference in the extreme temperature values that appear after treatment for the refractory and the metal tube, and the metal tube becomes extremely thick later. Therefore, as shown in the figure, the coefficient of thermal expansion of the metal tube is approximately 15 times larger than that of the refractory, and this, combined with the delay in the temperature curve described above, further increases the difference in expansion. It was learned that this causes physical strain between the refractory and the metal pipe, causing cracks and peeling of the refractory and bending of the metal pipe.
そこで発明者らは、上記の知見から被覆耐火物の亀裂、
剥離の原因となっている処理後の耐火物と一金属管との
熱膨張差を減少させるには、処理後のランスの温度上昇
を防止すればよく、そのため従来は処理終了と共にガス
吹込みを止め、容器外へ抜出し放置されていたのを、ラ
ンスの温度上昇防止のための処理終了後直ちに抜出し注
水によりランス金属管を冷却することに着目し、本発明
に到達したものである。Therefore, based on the above findings, the inventors discovered that cracks in coated refractories,
In order to reduce the difference in thermal expansion between the treated refractory and the metal tube, which is the cause of peeling, it is sufficient to prevent the temperature of the lance from rising after treatment. The present invention was developed by focusing on the method of cooling the lance metal tube by immediately removing it and pouring water into it after the treatment to prevent the temperature of the lance from rising, which had previously been removed from the container and left unattended.
即ち、本発明は、ガス通過孔を有する金属管とその外周
を囲む耐火物よりなる溶融金属撹拌ランスの使用に際し
、処理後肢ランス金属管に水を流して冷却することを特
徴とする溶融金属攪拌ランスの冷却方法である。That is, the present invention provides a molten metal stirring lance comprising a metal tube having a gas passage hole and a refractory material surrounding the outer periphery, which is characterized in that when using the molten metal stirring lance, water is allowed to flow through the lance metal tube after the treatment. This is a method of cooling the lance.
又、上記ランスの下部ガス通過孔に水回収装置を設け、
ランスの金属管上部より注入された水を回収するCとを
特徴とするものである。Further, a water recovery device is provided in the lower gas passage hole of the lance,
It is characterized by C that collects water injected from the upper part of the metal tube of the lance.
本発明において処理終了後容器外へ抜出したランスの金
属管上部より直接水を注入することの理由は、処理後の
ランスの温度上昇を防止する上で、熱伝導率の大きな流
体を使用することが望ましく、この流体として水が最も
有効だからである。In the present invention, the reason for injecting water directly from the upper part of the metal tube of the lance taken out of the container after the treatment is completed is to use a fluid with high thermal conductivity in order to prevent the temperature of the lance from rising after treatment. This is because water is the most effective fluid.
又、不発明方法においてランス金属管下部吐出口に設け
る水回収装置は、−列を第4図に示すように攪拌ランス
(3)の金属管(7)下部の吐出口に吸引盛付の管路を
取付け、この管路を通じて金属管上部から注入されろ水
を光合に回収するものであって、これによシ被覆耐火物
(8)の濡れによる寿命低下を防止するものである。尚
、図中第2図の符号と同一のものを用いた個所は総て従
来と変シがないことを表わす。In addition, in the uninvented method, the water recovery device provided at the lower discharge port of the metal tube of the lance is a pipe with a suction mound at the lower discharge port of the metal tube (7) of the stirring lance (3), as shown in FIG. A pipe is installed, and the filtrate injected from the upper part of the metal pipe through this pipe is collected in a refrigerant, thereby preventing shortening of the service life of the coated refractory (8) due to wetting. It should be noted that all parts in the figure using the same reference numerals as those in FIG. 2 indicate that there is no change from the conventional one.
次に示す第2表は、不発明方法の実施例と、処理後ラン
スに何ら冷却方法を講じない従来法による比較列を示し
だもので、ランスの使用条件は第1表と同一条件で行わ
れた。Table 2 shown below shows a comparison column of examples of the uninvented method and the conventional method in which no cooling method is applied to the lance after treatment, and the lance was used under the same conditions as in Table 1. I was disappointed.
本発明方法によりランスを冷却すれば、第2表に明らか
なように、使用条件の如何に拘らずランスの耐用寿命が
著しく延長さflそれに伴いコスト比も低減される。If the lance is cooled by the method of the present invention, as is clear from Table 2, the service life of the lance is significantly extended regardless of the usage conditions, and the cost ratio is accordingly reduced.
第1図は容器内攪拌ランスの断面図、第2図は攪拌ラン
スの構造模式図、第3図は従来法による使用時における
金属管、耐火物の温度と膨張比率の時間経過を示す線図
、第4図はランス金属管の下部吐出口へ水回収装置を取
付けた断面図1代理人 弁理士 木 村 三 期
間 同 佐々木 宗 治第1図
第2図
第3図
;:)CDC
郁80
時開(分)Figure 1 is a cross-sectional view of a stirring lance in a container, Figure 2 is a schematic structural diagram of the stirring lance, and Figure 3 is a diagram showing the temperature and expansion ratio of metal tubes and refractories over time when used in conventional methods. , Figure 4 is a cross-sectional view of the water recovery device attached to the lower discharge port of the lance metal pipe. 1 Agent: Patent Attorney Mitsu Kimura Term: Souji Sasaki Figure 1 Figure 2 Figure 3 ;:) CDC Iku 80 hours Open (minutes)
Claims (1)
耐火物よりなる溶融金属攪拌ランスの使用に際し、処理
後膣ランス金属管に水を流して冷却することを特徴とす
る溶融金属攪拌ランスの冷却方法。 (2)上記ランスの下部ガス通過孔に水回収装置を設け
、ランスの金属管上部よシ注入された水を回収する特許
請求の範囲第1項記載の溶融金属攪拌ランスの冷却方法
。[Scope of Claims] (]) When using a molten metal stirring lance made of a metal tube having gas passage holes and a refractory material surrounding the outer periphery, the lance is characterized by cooling it by flowing water through the lance metal tube after treatment. A cooling method for molten metal stirring lances. (2) The method for cooling a molten metal stirring lance according to claim 1, wherein a water recovery device is provided in the lower gas passage hole of the lance to recover water injected from the upper part of the metal tube of the lance.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1885483A JPS59145722A (en) | 1983-02-09 | 1983-02-09 | Cooling method of lance for stirring molten metal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1885483A JPS59145722A (en) | 1983-02-09 | 1983-02-09 | Cooling method of lance for stirring molten metal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59145722A true JPS59145722A (en) | 1984-08-21 |
Family
ID=11983121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1885483A Pending JPS59145722A (en) | 1983-02-09 | 1983-02-09 | Cooling method of lance for stirring molten metal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59145722A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6016751U (en) * | 1983-04-01 | 1985-02-04 | 黒崎窯業株式会社 | Pipes for gas and/or powder injection |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5687615A (en) * | 1979-12-15 | 1981-07-16 | Yoshikawa Kogyo Kk | Component controlling method of molten iron |
-
1983
- 1983-02-09 JP JP1885483A patent/JPS59145722A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5687615A (en) * | 1979-12-15 | 1981-07-16 | Yoshikawa Kogyo Kk | Component controlling method of molten iron |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6016751U (en) * | 1983-04-01 | 1985-02-04 | 黒崎窯業株式会社 | Pipes for gas and/or powder injection |
JPH0232673Y2 (en) * | 1983-04-01 | 1990-09-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2001040411A (en) | Ladle for refining molten steel | |
JP4207820B2 (en) | How to use vacuum degassing equipment | |
JPS59145722A (en) | Cooling method of lance for stirring molten metal | |
JPS6145681B2 (en) | ||
JPH05171250A (en) | Operation of rh degassing | |
JPH05320740A (en) | Method for prolonging service life of immersion tube in rh | |
CN86107834A (en) | The method of cooling oxygen injection nozzles in the oxygen treatments applied of the pig iron or steel | |
CN221724948U (en) | Drum-type slag scraping groove structure for outlet of copper water smelting furnace | |
JPS59145725A (en) | Cooling method of lance for stirring molten metal | |
JPS59110717A (en) | Vacuum circulation degassing apparatus | |
JP2819424B2 (en) | Manufacturing method of ultra-low carbon steel | |
JPH093522A (en) | Refractory-coated lance | |
JPS59145719A (en) | Cooling method of lance for stirring molten metal | |
JP2998039B2 (en) | Manufacturing method of ultra-low carbon steel | |
JP2003253322A (en) | Method for melting stainless steel in electric furnace | |
JPS59145720A (en) | Cooling method of lance for stirring molten metal | |
JPS62230929A (en) | Method for discharging molten metal | |
JPS621452B2 (en) | ||
JPS59145728A (en) | Cooling method of lance for stirring molten metal | |
JPS62230930A (en) | Method for discharging molten metal | |
JPH01142016A (en) | Continuous vacuum degassing apparatus for molten copper | |
SU1629322A1 (en) | Steelmaking process | |
JP4075200B2 (en) | Operation method in vacuum refining vessel | |
JPH11158536A (en) | Method for melting extra-low carbon steel excellent in cleanliness | |
JP3282530B2 (en) | Method for producing high cleanliness low Si steel |