JPS62215862A - Apparatus for measuring dissolved oxygen in molten steel - Google Patents
Apparatus for measuring dissolved oxygen in molten steelInfo
- Publication number
- JPS62215862A JPS62215862A JP61060147A JP6014786A JPS62215862A JP S62215862 A JPS62215862 A JP S62215862A JP 61060147 A JP61060147 A JP 61060147A JP 6014786 A JP6014786 A JP 6014786A JP S62215862 A JPS62215862 A JP S62215862A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- dissolved oxygen
- oxygen
- solid electrolyte
- measuring
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 239000001301 oxygen Substances 0.000 title claims abstract description 94
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 94
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 29
- 239000000523 sample Substances 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 21
- 239000011449 brick Substances 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 19
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000112 cooling gas Substances 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229910001026 inconel Inorganic materials 0.000 claims description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims 2
- 229910052786 argon Inorganic materials 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract description 2
- 229910002804 graphite Inorganic materials 0.000 abstract 1
- 239000010439 graphite Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 39
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 16
- 210000004027 cell Anatomy 0.000 description 15
- 239000011819 refractory material Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 5
- 230000009970 fire resistant effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003779 heat-resistant material Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 150000002926 oxygen Chemical class 0.000 description 3
- 229910001327 Rimmed steel Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 1
- -1 standard electrode Substances 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、固体電解質を用いた、溶鋼中の溶存酸素測定
装置に関する。更に詳しくは、該装置における溶鋼の熱
輻射等によるリード線の劣化を防止し、長時間の連続測
定を可能とした溶鋼中の溶存酸素測定装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for measuring dissolved oxygen in molten steel using a solid electrolyte. More specifically, the present invention relates to an apparatus for measuring dissolved oxygen in molten steel that prevents lead wires from deteriorating due to thermal radiation of molten steel and enables continuous measurement over a long period of time.
従来の技術
連続鋳造法により鋼を製造する場合、溶鋼中の酸素量は
極めて重要な因子である。即ち、溶鋼中の酸素濃度が高
い場合には、温度低下に伴って溶鋼が凝固し鋼となるに
従ってガス可溶量が低下し、鋼中に溶存酸素等がガスと
なって析出するいわゆるピンホール欠陥が発生する。When manufacturing steel by conventional continuous casting methods, the amount of oxygen in the molten steel is an extremely important factor. In other words, when the oxygen concentration in molten steel is high, as the molten steel solidifies and becomes steel as the temperature decreases, the amount of gas soluble decreases, causing so-called pinholes in which dissolved oxygen etc. in the steel precipitates as gas. Defects occur.
尚、脱酸剤としてＡＩ、 Ｓｉ、Ｔｉ等の易酸化性金属
を添加することにより、溶鋼中の酸素濃度の調整を行う
ことができるが、この脱酸剤の添加量が多すぎると、脱
酸原単位および鋼の性質に対して種々の影響が及ぼされ
る。例えば、ＡＩの添加量が多い場合には冷延成品にス
リバ疵が発生し、Ｓｌの添加量が多い場合には成品の機
械強度が上昇し、脆くなるなどの影響がみられる。Note that the oxygen concentration in molten steel can be adjusted by adding easily oxidizable metals such as AI, Si, and Ti as deoxidizing agents, but if the amount of this deoxidizing agent added is too large, deoxidizing There are various influences on the acid intensity and the properties of the steel. For example, when a large amount of AI is added, sliver defects occur in the cold-rolled product, and when a large amount of Sl is added, the mechanical strength of the product increases and it becomes brittle.
ところで、溶鋼中の溶存ガス中の、例えばＮ２、Ｎ２に
関しては、鋼の性質に悪影響を及ぼすことから、溶銑〜
吹錬〜溶１１工１処理を通じて、これらガスの侵入を防
止するための対策が講じられている。By the way, since dissolved gases in molten steel, such as N2 and N2, have an adverse effect on the properties of steel,
Measures are taken to prevent the intrusion of these gases throughout the blowing to melting process.
一方、０２に関しては転炉内吹錬や溶鋼処理時の着熱等
により、溶鋼内に侵入する危険性は高いが、上記の如＜
、Ａ１、Ｓｉ等の脱酸剤の投入により比較的容易に除去
できることから、一般に鋼などではそれ程大きな問題と
されていなかった。On the other hand, regarding 02, there is a high risk of it entering the molten steel due to heat generation during blowing in the converter or during molten steel processing, but as described above,
Since it can be removed relatively easily by adding a deoxidizing agent such as , A1, Si, etc., it has generally not been considered a big problem with steel.
しかしながら、近年ＣＣ比率の上昇と共に、特殊用途の
低合金鋼においては溶存酸素量が問題となりはじめてい
る。例えば、美しい表面を有する冷延鋼板やホーロー用
鋼板などにおいて前述のような問題がみられ、その結果
溶存・酸素量測定精度の高い連続測定法の必要性が高ま
っている。However, as the CC ratio has increased in recent years, the amount of dissolved oxygen has started to become a problem in low alloy steels for special purposes. For example, the above-mentioned problems have been observed in cold-rolled steel sheets and enameled steel sheets that have beautiful surfaces, and as a result, there is an increasing need for continuous measurement methods with high accuracy in measuring dissolved oxygen content.
連続鋳造法は、溶融した溶鋼を取鍋（し−ドル）より中
間価（タンディツシュ〉に注入し、該タンディツシュよ
り連続して鋳型（モールド）に鋳込むものであり、上記
理由により様々な時点で溶鋼中の溶存酸素量の測定に基
づく脱酸コントロールを行っている。In the continuous casting method, molten steel is injected from a ladle into an intermediate tundish, and then continuously cast into a mold from the tundish. Deoxidation control is performed based on measuring the amount of dissolved oxygen in molten steel.
例えば、レードル内の溶鋼に対し、溶存酸素の測定を行
い、その測定酸素量を考慮しつつ、脱酸剤の投入や不活
性がスバブリングあるいはＲＨ法の適用等が行なわれて
いる。For example, dissolved oxygen is measured in the molten steel in the ladle, and while taking the measured oxygen amount into consideration, a deoxidizing agent is added, inert bubbling is performed, or the RH method is applied.
更に、クンディツシュ内に、レードルから溶鋼を注入し
て鋳造を実施する場合にも、溶鋼中の酸素量の測定が行
なわれる。例えば、リムド鋼は転炉出鋼後、脱酸処理を
殆ど行わずに鋳型に鋳込むが、この時鋳型内では炭素と
酸素との反応によりリミングアクション（沸騰現象）を
起し、上記ピンホール欠陥を生じる。Furthermore, when casting is carried out by injecting molten steel into the kundish from a ladle, the amount of oxygen in the molten steel is also measured. For example, after rimmed steel is tapped from a converter, it is cast into a mold without much deoxidation treatment, but at this time, a rimming action (boiling phenomenon) occurs due to the reaction between carbon and oxygen in the mold, causing the pin holes mentioned above to occur. produce defects.
従って、リムド鋼の連続鋳造に際しては、製品の品位向
上を図る上で、脱酸剤の投入などによるタンディツシュ
内での溶鋼中の溶存酸素量制御が必要である。Therefore, when continuously casting rimmed steel, it is necessary to control the amount of dissolved oxygen in the molten steel in the tundish by adding a deoxidizing agent or the like in order to improve the quality of the product.
また、すでに脱酸した溶鋼をレードルからタンディツシ
ュ内に注入し、更にモールド内に鋳込む場合にも、鋳込
中にタンディツシュ内に鋳片品位改良剤としてへ１等を
投入することがあり、酸素濃度によっては上記した様に
、例えば冷延成品にスリバ疵等が発生する。In addition, when pouring already deoxidized molten steel from a ladle into a tundish and then casting it into a mold, 1 etc. may be added as a slab quality improver into the tundish during pouring. As mentioned above, depending on the concentration, for example, sliver defects may occur in cold rolled products.
上記した様な時点での溶鋼中の溶存酸素量の測定方法と
しては、従来より固体電解質を用いた酸素濃淡電池を利
用する方法が良く知られ、利用されている。As a method for measuring the amount of dissolved oxygen in molten steel at the above-mentioned point in time, a method using an oxygen concentration battery using a solid electrolyte is well known and has been used.
ここで、添付第７図（ａ）に基づいて、固体電解質を用
いた酸素濃淡電池の構造および酸素濃度測定原理を説明
する。添付第３図（ａ）は、一般的な固体電解質を用い
た酸素プローブにより構成される酸素濃淡電池を表す模
式的な断面図であり、この固体電解質を用いた酸素プロ
ーブにより構成される酸素濃淡電池は、隔壁として安定
化ジルコニア等の固体電解質１を用い、標準極２と被検
溶鋼３とを該固体電解質１を介して接触させ、さらに溶
鋼極４及びリード線５によって標準極２と溶鋼３とを電
気的に接続する構造となっており、該固体電解質１の両
側での酸素分圧の相違により標準極２−溶鋼３間に電位
差（濃淡電池起電力でこれはネルンス） （Ｎｅｒｎｓ
ｔ）の式で与えられる）が発生するため、その電位差を
電位差計６により測定して、その測定値から標準極２の
酸素分圧および溶鋼温度を用いて、溶鋼内の酸素分圧な
らびに濃度を知ることができる様になっている。Here, the structure of an oxygen concentration battery using a solid electrolyte and the principle of oxygen concentration measurement will be explained based on the attached FIG. 7(a). Attached FIG. 3(a) is a schematic cross-sectional view showing an oxygen concentration battery configured with an oxygen probe using a general solid electrolyte. In the battery, a solid electrolyte 1 such as stabilized zirconia is used as a partition wall, a standard electrode 2 and the molten steel 3 to be tested are brought into contact via the solid electrolyte 1, and a molten steel electrode 4 and a lead wire 5 are used to connect the standard electrode 2 and the molten steel. 3, and due to the difference in oxygen partial pressure on both sides of the solid electrolyte 1, there is a potential difference between the standard electrode 2 and the molten steel 3 (Nerns in concentration cell electromotive force).
t) is generated, the potential difference is measured with a potentiometer 6, and from the measured value, using the oxygen partial pressure of the standard electrode 2 and the molten steel temperature, the oxygen partial pressure and concentration in the molten steel are calculated. It is now possible to know.
この様な、固体電解質を用いたプローブによる溶鋼中の
溶存酸素量の測定は、従来、添付第７図ら）に示された
様な、スポット測定用のオキシゲンブローブ（ＯＸＰ、
ｏｘｙｇｅｎ ｐｒｏｂｅ） と称する装置を用い
て行なわれてきた。即ち、添付第７図（ｂ）からも明ら
かな様に、スポット測定用のこのオキシゲンプローブは
、ジルコニアセル（固体電解質）１、溶鋼極４およびＲ
タイプ熱電対７を、紙管８の先端にまとめて固定した構
造となっており、紙管８の先端を溶鋼中に浸漬すること
により溶鋼中の溶存酸素量を測定できる様になっている
。Measuring the amount of dissolved oxygen in molten steel using a probe using a solid electrolyte has conventionally been carried out using a spot measurement oxygen probe (OXP,
This has been carried out using a device called an oxygen probe. That is, as is clear from the attached FIG. 7(b), this oxygen probe for spot measurement consists of a zirconia cell (solid electrolyte) 1, a molten steel pole 4, and a R
It has a structure in which type thermocouples 7 are fixed together at the tip of a paper tube 8, and by immersing the tip of the paper tube 8 into molten steel, the amount of dissolved oxygen in the molten steel can be measured.
従来では、この様な、スポット測定用装置を用い、上記
様々な時点で溶鋼中の溶存酸素量をスポット測定し、得
られた値によってＲＨ法、ＤＨ法の適用、ＡＩ等の脱酸
剤の投入などを制御し溶鋼中の溶存酸素量を調節してき
た。Conventionally, such a spot measurement device is used to spot measure the amount of dissolved oxygen in molten steel at the various points mentioned above, and the obtained values are used to determine the application of the RH method, DH method, and the use of deoxidizers such as AI. The amount of dissolved oxygen in molten steel has been adjusted by controlling the input of molten steel.
しかしながら、リムド代替鋼のような脱酸程度の低い鋼
を連続鋳造で製造する場合、タンディツシュ内の溶存酸
素１の挙動をスポット測定するだけでは十分な溶存酸素
量の制御を行い得ない。即ち、連々鋳のつなぎ間、ある
いは連続鋳造工程の初期、末期等のいわゆる非定常部に
おいては、溶存酸素量はかなり大きな範囲で変動するた
め、スポット測定ではその動向を正確にとらえることが
不可能となる。従って、その変動に適時対応して脱酸剤
の投入等を行い寿ないため、十分な成品の品質を保てな
くなる。However, when producing steel with a low degree of deoxidation, such as rimmed alternative steel, by continuous casting, the amount of dissolved oxygen cannot be sufficiently controlled just by spot measuring the behavior of dissolved oxygen 1 in the tundish. In other words, in so-called unsteady parts such as between continuous casting or at the beginning and end of a continuous casting process, the amount of dissolved oxygen fluctuates over a fairly large range, making it impossible to accurately capture trends using spot measurements. becomes. Therefore, a deoxidizing agent must be added in a timely manner in response to the fluctuations, and the quality of the finished product cannot be maintained.
上記溶存酸素量の変動を連続的にとらえることができれ
ば、その変動に適時対応し、脱酸処理を行うことができ
、その結果、製品の品位、歩留り等に有利な効果を得る
こととなるため、連続測定が可能な溶鋼中の溶存酸素量
測定装置への要請かたかまり、様々な方法並びに装置の
開発が行われた。If it is possible to continuously detect the fluctuations in the amount of dissolved oxygen mentioned above, it will be possible to respond to the fluctuations in a timely manner and perform deoxidation treatment, which will result in beneficial effects on product quality, yield, etc. In response to growing demand for a device for measuring the amount of dissolved oxygen in molten steel that can perform continuous measurements, various methods and devices have been developed.
固体電解質（ジルコニアセル）を用いたプローブを連続
測定に使用する場合にまず問題となるのは、固体電解質
、標準電極および固体電解質サポートの耐久性と、溶鋼
極の溶損とである。When using a probe using a solid electrolyte (zirconia cell) for continuous measurement, the first problems are the durability of the solid electrolyte, standard electrode, and solid electrolyte support, and the erosion of the molten steel electrode.
ジルコニアセル本体の劣化および標準極の変質（焼結等
）は、非常にゆっ（すした過程で行われるものであり、
ジルコニアセルを溶鋼に浸漬した状態で２．０〜４．０
時間の間安定して使用できる。Deterioration of the zirconia cell body and deterioration of the standard electrode (sintering, etc.) occur in a very slow process.
2.0 to 4.0 when the zirconia cell is immersed in molten steel
Can be used stably for hours.
但し、固体電解質そのものは、ある程度厚くしておいた
方が安定した波形が得られる。However, a more stable waveform can be obtained if the solid electrolyte itself is made thicker to some extent.
シカシながら、ジルコニアセルサポートは、添付第７図
（ｂ）に示した様な紙管であっては、耐熱性に乏しく、
その耐久時間はせいぜい１分間にすぎない。However, if the zirconia cell support is a paper tube like the one shown in attached Figure 7(b), it has poor heat resistance.
Its durability is only one minute at most.
従って、このジルコニアセルサポートには種々改良が加
えられており、例えば、ジルコニア系固体電解質の架設
基部を金属で覆ったもの（特願昭５９−１７１４８号）
などが開発されたが十分ではなかった。そこで、溶鋼よ
りも比重の小さな耐火物、例えばＡ Ｉ ２０３系耐火
物等のブロックにジルコニアセルを取付け、これを溶鋼
表面に浮せたものが、すでに本発明者等によって出願さ
れている（特願昭ｍ５９−２０９２８３ 号）。ジルコ
ニアセルサポートを上記構造とすることにより、その耐
火性が向上し、約５０分間に亘って安定に使用できるよ
うになった。Therefore, various improvements have been made to this zirconia cell support, such as one in which the base of the zirconia solid electrolyte is covered with metal (Japanese Patent Application No. 17148/1982).
were developed, but they were not sufficient. Therefore, the present inventors have already filed an application for a system in which a zirconia cell is attached to a block of refractory material having a specific gravity lower than that of molten steel, such as AI 203 series refractory material, and is floated on the surface of the molten steel. Gansho m59-209283). By providing the zirconia cell support with the above structure, its fire resistance was improved and it became possible to use it stably for about 50 minutes.
また、溶鋼極を直接溶鋼に浸漬した場合の溶損を防止す
るために、溶鋼極を溶鋼と電気的に接続されている建屋
アース等からとる方式（特願昭第６０−２６６９３４号
）も開発されている。In addition, in order to prevent corrosion damage when the molten steel pole is directly immersed in molten steel, we have developed a method (Japanese Patent Application No. 60-266934) in which the molten steel pole is connected to the building ground, etc., which is electrically connected to the molten steel. has been done.
上記した７０−ティングブロック方式および溶鋼極建屋
アース等からとる方式をあわせて採用することにより、
ジルコニアセルおよびセルサポートの耐久性の改善およ
び溶鋼極の溶損の防止が可能となった。By adopting the above-mentioned 70-ting block method and the method taken from the molten steel pole building ground, etc.,
It has become possible to improve the durability of the zirconia cell and cell support, and to prevent melting damage of the molten steel pole.
発明が解決しようとする問題点
以上説明してきたように、フローティング方式および溶
鋼極を建屋アースより取る方法を採用することにより、
かなり長時間（１〜２時間）の溶存酸素の連続測定を行
うことが可能となった。Problems to be Solved by the Invention As explained above, by adopting the floating method and the method of taking the molten steel pole from the building ground,
It has become possible to perform continuous measurements of dissolved oxygen over a fairly long period of time (1 to 2 hours).
しかしながら、これら従来技術は以下に述べるような問
題点を有していた。However, these conventional techniques have the following problems.
即ち、フローティング方式を採用した場合、ジルコニア
セルヲ支持するフローティングブロックの耐久性は十分
であるが、溶鋼直上にくるリード線が溶鋼の輻射熱等の
影音により劣化あるいは融解し、断線を起こすことがあ
った。従って、リード線の輻射熱に対する耐久性が、連
続測定時間を制限することとなる。In other words, when the floating method is adopted, the durability of the floating block that supports the zirconia cell is sufficient, but the lead wire directly above the molten steel may deteriorate or melt due to the sound effects of the radiant heat of the molten steel, causing wire breakage. . Therefore, the durability of the lead wire against radiant heat limits the continuous measurement time.
このリード線の耐熱性不足は、リード線に耐熱材等を強
固に施工することにより対処することができる。しかし
ながら、耐熱材を用い、リード線に十分な耐熱性を持た
せるには、多量の耐熱材を必要とし、酸素センサのコス
トアップにつながる。This lack of heat resistance of the lead wire can be dealt with by firmly covering the lead wire with a heat resistant material or the like. However, using a heat-resistant material and providing the lead wire with sufficient heat resistance requires a large amount of heat-resistant material, which increases the cost of the oxygen sensor.
また、センサの総重量が増加し、センサを溶鋼表面に浮
遊させるためのフローティングブロックの浮力を増加さ
せなければならない。フローティングブロックの浮力を
増加させるためには、その体積を増加させることが必要
であるが、その結果、センサそのものの重量ならびに大
きさが増加し、現場設置型として不向きとなる。Additionally, the total weight of the sensor increases, and the buoyancy of the floating block for floating the sensor on the surface of the molten steel must be increased. In order to increase the buoyancy of the floating block, it is necessary to increase its volume, but as a result, the weight and size of the sensor itself increase, making it unsuitable for field installation.
従って、本発明の目的は、リード線の耐熱性能を高め、
かつ現場設置型として適切な大きさを有し、更に長時間
の連続測定を可能とする溶存酸素測定装置を開発するこ
とにある。Therefore, an object of the present invention is to improve the heat resistance performance of lead wires,
Another object of the present invention is to develop a dissolved oxygen measuring device that has an appropriate size for on-site installation and is capable of continuous measurement over a long period of time.
発明が解決しようとする問題点
本発明者は、上記従来技術のごとき問題点を有さない溶
存酸素測定装置を開発すべく、種々検討した結果、フロ
ーティング方式を採用せず、酸素プローブおよびリード
線を溶鋼容器の内壁に設置する方式を採用し、上記本発
明の目的を解決し得る溶鋼中の溶存酸素測定装置を開発
した。Problems to be Solved by the Invention The inventor of the present invention has conducted various studies in order to develop a dissolved oxygen measuring device that does not have the problems of the prior art described above. The present inventors have developed an apparatus for measuring dissolved oxygen in molten steel that can solve the above-mentioned object of the present invention by installing the oxygen on the inner wall of a molten steel container.
即ち、本発明による溶存酸素測定装置は、耐火性ブロッ
クと、このブロックに支持され、標準電極を内蔵する固
体電解質とからなる酸素プローブと、該標準極と溶鋼と
を電気的に接続するためのリード線とからなり、溶鋼容
器内壁面に、キャスタブル耐火物によって埋設されるこ
とを特徴とする。That is, the dissolved oxygen measuring device according to the present invention includes an oxygen probe consisting of a fireproof block, a solid electrolyte supported by the block and containing a standard electrode, and an oxygen probe for electrically connecting the standard electrode and molten steel. It is characterized by being embedded in the inner wall surface of the molten steel container with castable refractories.
上記酸素プローブは、上記標準極を溶鋼による高温から
保護する構造となっていることが好ましく、例えば耐火
性ブロックと該耐火性ブロックに埋設され、上端が開口
したポーラスレンガ製円筒部材と該ポーラスレンガ製円
筒部材の開口部に設置される固体電解質と溶鋼容器外部
と該円筒部材内部とを連通ずる冷却ガス用管手段とによ
り酸素プローブを構成し、該管手段により該容器内にＡ
ｒガスを流入させ、これをポーラスレンガを介して溶鋼
中に排出して標準極を冷却する構造とすることが好まし
い。また、リード線を該管手段内を通して標準極に接続
することも可能であり、この場合には冷却ガスによる冷
却効果によりリード線の熱に対する保護も達成される。The oxygen probe preferably has a structure that protects the standard electrode from high temperatures caused by molten steel, such as a fire-resistant block, a cylindrical member made of porous brick buried in the fire-resistant block and having an open upper end, and the porous brick. An oxygen probe is constituted by a solid electrolyte installed in the opening of the cylindrical member, and a cooling gas pipe means for communicating the outside of the molten steel container with the inside of the cylindrical member, and the pipe means allows A to be injected into the container.
It is preferable to have a structure in which the standard electrode is cooled by allowing r gas to flow in and discharging it into the molten steel through a porous brick. It is also possible to connect the lead wires to the standard poles through the tube means, in which case thermal protection of the lead wires is also achieved by the cooling effect of the cooling gas.
更に、上記リード線は、キャスタブル耐火物または上記
耐火性ブロックとの絶縁性を良くするために絶縁性かつ
耐火性の被覆を有することが好ましく、例えばＭｏ等の
リード線表面をへ１□０３粉末で覆い、更にその外部を
インコネル被覆で覆ったシース線を好ましい例として挙
げることができる。Further, the lead wire preferably has an insulating and fire-resistant coating to improve insulation with the castable refractory or the refractory block. A preferred example is a sheathed wire in which the outside is covered with an Inconel coating.
−作月
溶鋼中の溶存酸素量測定装置を現場設置に適し、かつ長
時間の測定が可能なものとするには上記構成を採用する
ことが有利である。- It is advantageous to adopt the above configuration in order to make the apparatus for measuring the amount of dissolved oxygen in molten steel suitable for on-site installation and capable of long-term measurement.
即ち、本発明による溶存酸素量測定装置は、溶鋼容器内
壁面にキャスタブル耐火物を用いて埋設する方式を採用
しているため施工が簡単である。That is, the dissolved oxygen amount measuring device according to the present invention is easy to install because it uses a method of embedding the device in the inner wall surface of a molten steel container using a castable refractory.
通常、耐火性の溶鋼容器は、添付第８図に示す如く、鉄
皮４１内壁にモルタル４２を塗布し、さらにその表面に
耐火レンガ４３を設置した構造となっている。また場合
によっては、その耐火レンガ４３表面にキャスタブル耐
火物４５を塗布する。Usually, a fire-resistant molten steel container has a structure in which mortar 42 is applied to the inner wall of a steel skin 41 and fire bricks 43 are further placed on the surface thereof, as shown in the attached FIG. 8. In some cases, a castable refractory material 45 is applied to the surface of the refractory brick 43.
この様な構造を有する溶鋼容器４４内壁面に固体電解質
１を埋設する場合、耐火レンガ４３をけずり、固体電解
質１を埋め込む方も考え°得るが、この方式は耐火レン
ガ４３の実質的厚みが減少するため、漏鋼する危険性が
あり、かつレンガ４３をけずりこむ工程が必要となる。When embedding the solid electrolyte 1 in the inner wall surface of the molten steel container 44 having such a structure, one may consider cutting off the refractory bricks 43 and embedding the solid electrolyte 1, but this method reduces the substantial thickness of the refractory bricks 43. Therefore, there is a risk of steel leakage, and a process of cutting in the bricks 43 is required.
本発明による溶鋼中の溶存酸素量測定装置は添付第１図
に示されたように、従来通り組み立てた溶鋼容器４４内
壁面上に固体電解質１を支持した耐火ブロック２０を配
置し、リード線、例えばシース線２６とともにキャスク
プル耐火物４５によって埋設する方式を採用しており、
従って従来の溶鋼容器施工方法とほとんど同じ簡単な作
業により設置でき゛る。The device for measuring the amount of dissolved oxygen in molten steel according to the present invention, as shown in the attached FIG. For example, a method is adopted in which the sheath wire 26 and the cask pull refractories 45 are buried.
Therefore, it can be installed using simple operations that are almost the same as conventional molten steel container construction methods.
また、固体電解質１は溶鋼３に接するように突出させて
おくことが必要である。そこで、第２図に示された様に
あらかじめ鉄製のキャップ４６によって固体電解質を覆
い埋設する方法を採用することが好ましい。即ち、この
様にして埋設することにより、溶鋼３が注入された後、
溶鋼３に接したキャップ４６が融解し、固体電解質１の
耐火性ブロックから突出する部分全体を溶鋼３と接する
様にすることが可能となる。Further, the solid electrolyte 1 needs to protrude so as to be in contact with the molten steel 3. Therefore, it is preferable to adopt a method in which the solid electrolyte is covered and buried in advance with an iron cap 46 as shown in FIG. That is, by burying it in this way, after the molten steel 3 is injected,
The cap 46 in contact with the molten steel 3 is melted, and the entire portion of the solid electrolyte 1 protruding from the refractory block can be brought into contact with the molten steel 3.
更に、本発明の溶鋼中の溶存酸素測定装置は、リード線
を耐火性外装材によって覆ったシース線として絶縁不良
による起電力の低下等のトラブルを防止するとともに耐
熱性（１０００℃程度）をも付与している。Furthermore, the device for measuring dissolved oxygen in molten steel of the present invention has a sheathed wire in which the lead wire is covered with a fire-resistant exterior material, which prevents problems such as a drop in electromotive force due to poor insulation, and also has heat resistance (approximately 1000 degrees Celsius). Granted.
また、耐火性ブロック内に埋設されたポーラスレンガ製
円筒部材にＡｒガスフローを行うために設けられた冷却
ガス用管手段内に上記シース線を配置すれば、リード線
に関するトラブルはほぼなくなる。但し、キャスクプル
耐火物による埋設を容易にするために、冷却ガス用管は
直径５ ｍｍ以下にすることが好ましい。Moreover, if the sheath wire is placed in the cooling gas pipe means provided for flowing Ar gas into the cylindrical member made of porous brick buried in the refractory block, troubles related to the lead wire will be almost eliminated. However, in order to facilitate embedding with cask pull refractories, it is preferable that the cooling gas pipe has a diameter of 5 mm or less.
以上説明した様に、溶鋼中の溶存酸素測定装置の酸素プ
ローブを上記構成とすることにより、標孕極および支持
体の耐熱性の向上を図るとともに、リード線の熱による
影背を回避することが可能となった。従って、この酸素
プローブを用い、さらに溶鋼極を建屋アースから取る方
式を採用すれば、非常に長時間安定した溶存酸素測定が
できる。As explained above, by configuring the oxygen probe of the device for measuring dissolved oxygen in molten steel as described above, it is possible to improve the heat resistance of the lead electrode and the support, and to avoid shadows caused by the heat of the lead wire. became possible. Therefore, by using this oxygen probe and adopting a method in which the molten steel pole is connected to the building ground, stable dissolved oxygen measurements can be made for a very long time.
実施例
以下、実施例に基き、本発明の溶存酸素測定装置をさら
に詳しく説明するが、本実施例は同等本発明を限定しな
い。EXAMPLES Hereinafter, the dissolved oxygen measuring device of the present invention will be explained in more detail based on Examples, but these Examples do not similarly limit the present invention.
本発明による溶存測定装置を一般的な溶鋼容器に用いた
。まず、本実施例において用いた酸素プローブは、添付
第３図（ａ）に示されるような構成となっており、即ち
酸素プローブ２０は、アルミナグラファイト製の耐火性
ブロック２１と、耐火性ブロック２１内に埋設され、上
端が開口したポーラスレンガ製円筒部材２２（アルミナ
質）と、ポーラスレンガ製円筒部材２２の開口部に嵌合
した固体電解質（ジルコニアセル）１と、耐火性ブロッ
ク２１およびポーラスレンガ製円筒部材２２と連通し、
円筒部材２２内にへｒガスを導入し、ポーラスレンガを
介して溶鋼中に排出するへｒガス管（インコネルまたは
Ｓ Ｕ Ｓ ） ２４とにより構成されており、固体電
解質１に内蔵された標準極（［：ｒ／Ｃｒ２０３） ２
と溶鋼極との電気的接続は、Ａ「ガス管２４内を通るシ
ース線２６により行った。The dissolution measuring device according to the present invention was used in a general molten steel container. First, the oxygen probe used in this example has a configuration as shown in the attached FIG. A porous brick cylindrical member 22 (alumina) buried in the porous brick cylindrical member 22 with an open upper end, a solid electrolyte (zirconia cell) 1 fitted into the opening of the porous brick cylindrical member 22, a refractory block 21, and a porous brick. communicates with the made cylindrical member 22,
It is composed of a gas pipe (Inconel or SUS) 24 that introduces gas into the cylindrical member 22 and discharges it into the molten steel through a porous brick, and a standard electrode built into the solid electrolyte 1. ([:r/Cr203) 2
Electrical connection between the A and the molten steel electrodes was made by a sheathed wire 26 passing through the gas pipe 24.
本実施例に用いられたシース線は、添付第３図ら）に示
される様に、Ｍｏワイヤー３１表面にＡｌ２Ｏ３扮末３
２を被覆しさらにその外部をインコネル被覆３３で覆っ
たものである。The sheath wire used in this example has Al2O3 powder 3 on the surface of the Mo wire 31, as shown in the attached Figure 3.
2 and the outside thereof is further covered with an Inconel coating 33.
以上説明した様な構成の酸素プローブおよびリード線を
、添付第２図に示される様に溶鋼容器内に設置した。即
ち、鉄皮４１内壁にモルタル４２を塗布し、さらにその
内側に耐火レンガ４３を設置した溶鋼容器４４内壁に上
記酸素プローブ２０およびシース線２６を通したＡｒガ
ス管２４を配置し、キャスタブル耐火物４５ （Ｓｉｎ
２・Ａｌ２Ｏ３系）により埋設した。The oxygen probe and lead wire constructed as described above were installed in a molten steel container as shown in the attached FIG. 2. That is, mortar 42 is applied to the inner wall of the steel shell 41, and the Ar gas pipe 24 through which the oxygen probe 20 and the sheath wire 26 are passed is placed on the inner wall of the molten steel container 44, in which refractory bricks 43 are installed. 45 (Sin
2.Al2O3 system).
この際、ジルコニアセル１は、溶鋼との接触面積を大き
くするために、鉄製キャップ４６により保護し、キャス
タブル耐火物４５により覆れることのないようにした。At this time, the zirconia cell 1 was protected by an iron cap 46 so as not to be covered by the castable refractory 45 in order to increase the contact area with the molten steel.
上記の如く設置した後、この溶鋼容器４４内に溶鋼を鋳
込んだところ、添付第１図に示すような状態となった。After installing as described above, molten steel was poured into the molten steel container 44, resulting in a state as shown in the attached FIG. 1.
即ち、溶鋼容器４４内部側壁にキャスタブル耐火物４５
により埋設した酸素プローブ２０およびＡｒガス管２４
は、溶鋼３内に存在することとなる。この時、ジルコニ
アセル１を保護していた鉄製キャップは溶解し、十分な
溶鋼３とジルコニアセル１との接触面積を確保できた。That is, the castable refractory material 45 is placed on the inner side wall of the molten steel container 44.
Oxygen probe 20 and Ar gas pipe 24 buried by
exists in the molten steel 3. At this time, the iron cap that protected the zirconia cell 1 was melted, and a sufficient contact area between the molten steel 3 and the zirconia cell 1 was ensured.
以上の構成を有する酸素プローブおよびシース線を用い
、溶鋼極を建屋アースからとり溶鋼中の溶存酸素量を測
定したところ添付第４図に示される様な結果を得た。即
ち、添付第４図は、本発明による溶存酸素測定装置を複
数用いて、溶鋼中の溶存酸素量を測定した場合の、耐久
時間と、その耐久時間まで耐用できた個数との関係を示
すグラフであり、比較のため本発明による装置でＡｒガ
スフローしたものおよびＡｒガスフローしなかったもの
と、従来のフローティング方式のものとを合せて示した
。Using the oxygen probe and sheathed wire having the above configuration, the molten steel pole was taken from the building ground and the amount of dissolved oxygen in the molten steel was measured, and the results shown in the attached FIG. 4 were obtained. That is, attached FIG. 4 is a graph showing the relationship between the durability time and the number of pieces that can withstand the durability time when the amount of dissolved oxygen in molten steel is measured using a plurality of dissolved oxygen measuring devices according to the present invention. For comparison, the apparatus according to the present invention with Ar gas flow and without Ar gas flow, and the conventional floating type apparatus are also shown.
第４図からも明らかなように、本発明による溶存酸素測
定装置は、従来型の測定耐久時間（約１時間）に対して
、后ガスフロー巳なかった場合で２．２時間、Ａｒガス
フローした場合には４．８時間であり、著しくその測定
耐久時間を延長できた。As is clear from FIG. 4, the dissolved oxygen measuring device according to the present invention lasts for 2.2 hours when there is no Ar gas flow, compared to the conventional measurement durability time (about 1 hour). In this case, the measured durability time was 4.8 hours, which significantly extended the measured durability time.
また、その時得られた起電力波形を添付第５図に示した
。比較のために、従来のバッチ式測定装置およびフロー
ティング方式の測定装置により得られた起電力波形をも
合わせて示した。第５図からも明らかな様に、バッチ式
測定装置による波形は、安定している時間が数十秒間と
短く、更に、フローティング方式の測定装置と比較して
本発明による測定装置による波形は、安定している。Further, the electromotive force waveform obtained at that time is shown in the attached FIG. 5. For comparison, electromotive force waveforms obtained by a conventional batch-type measuring device and a floating-type measuring device are also shown. As is clear from FIG. 5, the waveform produced by the batch-type measuring device has a short stable time of several tens of seconds, and furthermore, compared to the floating-type measuring device, the waveform produced by the measuring device according to the present invention is stable.
発明の詳細
な説明した様に、本発明による溶鋼中の溶存酸素測定装
置によれば、酸素プローブを溶鋼容器内壁に埋設する方
式を採用したことにより、リード線に対して十分な耐熱
性を与えた場合も、装置全体を大きなものとしなくても
よくなっており、さらにＡｒガスフローによる標準極の
冷却を行うと共に、Ａ「ガス管内にリード線を通すこと
によりリード線の冷却を行ったことにより、耐熱性が著
しく向上した。As described in detail, the device for measuring dissolved oxygen in molten steel according to the present invention employs a method in which the oxygen probe is embedded in the inner wall of the molten steel container, thereby providing sufficient heat resistance to the lead wire. In this case, the entire device does not need to be large, and the standard electrode is cooled by Ar gas flow, and the lead wire is cooled by passing it through the gas pipe. As a result, heat resistance has been significantly improved.
従って、長時間に亘る測定が可能となり、溶鋼中の溶存
酸素量の変化を正確にとらえることができ、適時その酸
素量変化に対応して脱酸コントロールを正確に行うこと
ができる。Therefore, it is possible to carry out measurements over a long period of time, to accurately detect changes in the amount of dissolved oxygen in molten steel, and to accurately control deoxidation in response to changes in the amount of oxygen at the appropriate time.
また、上記特性により、脱酸コントロールの合理化を行
うことが可能である。例えば、取鍋の段階からタンディ
ツシュの段階における脱酸コントロールは、一般的には
、取鍋段階においてＲＨ法を適用し、その真空槽内でＡ
１投入を行い、酸素濃度を測定することを一連の脱酸処
理工程とし、所定の酸素濃度値となるまでこの工程をく
り返すことにより行われており、レードル内の溶鋼はそ
の濃度値に適した時点でタンディツシュ内に注入し、そ
のまま、鋳型に鋳込まれている。そのため、その酸ＳＲ
の調節は正確に行わなければならない。Furthermore, the above characteristics enable rationalization of deoxidation control. For example, to control deoxidation from the ladle stage to the tundish stage, the RH method is generally applied at the ladle stage, and A
The process consists of a series of deoxidation treatment steps in which the molten steel in the ladle is placed in a ladle and the oxygen concentration is measured, and this process is repeated until a predetermined oxygen concentration is reached. At that point, it is injected into the tandish and cast directly into the mold. Therefore, the acid SR
must be adjusted accurately.
しかしながら、この方法によれば、酸素濃度に対するへ
ｌ投入量のずれが１ケ月間に三重数回あり、上記工程の
くり返し回数を多くしなければならなかった。However, according to this method, there was a difference in the amount of 1 injected into the reactor with respect to the oxygen concentration several times in a month, and the above steps had to be repeated many times.
しかしながら、本発明の酸素量測定装置を採用した場合
、その酸素量変化にたいする対応をすばやく行い得るた
め、上記工程の反復回数を減少させ、最終的な酸素濃度
調節をタンディツシュ内でのへ１投入等により正確に行
うことが可能となった。However, when the oxygen amount measuring device of the present invention is adopted, it is possible to quickly respond to changes in oxygen amount, so the number of repetitions of the above steps can be reduced, and the final oxygen concentration adjustment can be carried out by adding one in the tundish. This made it possible to do it more accurately.
添付第６図は、従来のバッチ式溶存酸素測定装置を用い
た脱酸コントロール法から、本発明の装置を用いた脱酸
コントロール法へ徐々に変換していった場合の、上記工
程の反復回数の変化を示すグラフであり、棒グラフは該
工程の反復回数を、折れ線グラフは、本発明の脱酸コン
トロール法によるチャージ数／全体のチャージ数（連続
測定脱酸コントロール適用率）を示している。このグラ
フからも明らかな様に、本発明の装置を用いる脱酸コン
トロール法を適用することにより、該工程反復回数はい
ちじるしく減少しており、脱酸コントロールの合理化が
行い得たことがわかる。Attached Figure 6 shows the number of repetitions of the above steps when the deoxidation control method using the conventional batch-type dissolved oxygen measuring device is gradually converted to the deoxidization control method using the device of the present invention. 2 is a graph showing changes in the process, the bar graph shows the number of repetitions of the process, and the line graph shows the number of charges/total number of charges (continuously measured deoxidizing control application rate) according to the deoxidizing control method of the present invention. As is clear from this graph, by applying the deoxidation control method using the apparatus of the present invention, the number of repetitions of the process was significantly reduced, indicating that deoxidation control could be streamlined.
添付第１図は、本発明の溶鋼中の溶存酸素測定装置を採
用した場合の状態を示す概略断面図であり、
添付第２図は、本発明の装置が溶鋼容器内に埋設された
直後の状態を示す部分断面図であり、添付第３図（ａ）
は、本発明の装置の酸素プローブの好ましい一態様を示
す概略断面図であり、添付第３図（ｂ）は、本発明の装
置に用いるシース線の好ましい一態様を示す図であり、
添付第４図は、本発明の装置および従来型の装置を用い
て溶鋼中の溶存酸素量を測定した場合の耐久時間と、そ
の耐久時間まで測定可能であった装置の個数との関係を
従来型と比較して表すグラフであり、
添付第５図は、本発明の装置および従来型の装置を用い
て溶鋼中の溶存酸素量を測定した場合の、測定電圧波形
を従来型の装置と比較して表すグラフであり、
添付第６図は、従来のバッチ式測定装置を用いた脱酸コ
ントロール法より、本発明の装置を用いた脱酸コントロ
ール法に徐々に変化していった場合の脱酸処理工程反復
回数の変化を示すグラフであり、添付第７図（ａ）は、
固体電解質を用いた酸素濃淡電池の構成を示す概念図で
あり、
添付第７図（ｂ）は、従来のスポット測定用酸素プロー
ブ先端部の側面図であり、
添付第８図は、一般適な溶鋼容器の構成を示す部分断面
図である。
（主な参照番号）
１・・固体電解質、 ２・・標準極、３・・溶鋼、
２０・・酸素プローブ、２４・・冷却ガス用管手段（
八「ガス管）、２６・・シース線、 ４４・・溶鋼容器
、４５・・キャスクプル耐火物Attached Fig. 1 is a schematic sectional view showing the state when the device for measuring dissolved oxygen in molten steel of the present invention is adopted, and attached Fig. 2 is a schematic sectional view showing the state when the device of the present invention is installed in a molten steel container. It is a partial cross-sectional view showing the state, and attached Fig. 3(a)
is a schematic sectional view showing a preferable embodiment of the oxygen probe of the device of the present invention, and attached FIG. 3(b) is a diagram showing a preferable embodiment of the sheath wire used in the device of the present invention. Figure 4 shows the relationship between the durability time when measuring the amount of dissolved oxygen in molten steel using the device of the present invention and the conventional device, and the number of devices that were able to measure up to that durability time. This is a graph showing a comparison, and FIG. 5 attached shows a comparison of the measured voltage waveform when measuring the amount of dissolved oxygen in molten steel using the device of the present invention and the conventional device. The attached figure 6 shows the deoxidation process when the deoxidization control method using the conventional batch-type measuring device was gradually changed to the deoxidization control method using the device of the present invention. It is a graph showing changes in the number of process repetitions, and attached FIG. 7(a) is a graph showing changes in the number of process repetitions.
This is a conceptual diagram showing the configuration of an oxygen concentration battery using a solid electrolyte. Attached Figure 7(b) is a side view of the tip of a conventional oxygen probe for spot measurement. Attached Figure 8 is a general-purpose oxygen probe. FIG. 2 is a partial cross-sectional view showing the configuration of a molten steel container. (Main reference numbers) 1. Solid electrolyte, 2. Standard electrode, 3. Molten steel,
20...Oxygen probe, 24...Cooling gas pipe means (
8 (gas pipe), 26... sheathed wire, 44... molten steel container, 45... cask pull refractory
Claims (5)
を内蔵する固体電解質とからなる酸素プローブと、該標
準極と溶鋼とを電気的に接続するためのリード線とから
なり、溶鋼容器内壁面に、キャスタブル耐火物により埋
設されることを特徴とする溶鋼中の溶存酸素測定装置。(1) An oxygen probe consisting of a fireproof block, a solid electrolyte supported by the block and containing a standard electrode, and a lead wire for electrically connecting the standard electrode and the molten steel, inside the molten steel container. A device for measuring dissolved oxygen in molten steel, characterized in that it is embedded in a wall using a castable refractory.
ックに埋設され、上端が開口したポーラスレンガ製円筒
部材と、該円筒部材の開口部に嵌合され上記標準極を内
蔵した上記固体電解質と、上記溶鋼容器外部と該円筒部
材とを連通する冷却ガス用管手段とにより構成されるこ
とを特徴とする特許請求の範囲第１項に記載の溶鋼中の
溶存酸素測定装置。(2) The oxygen probe includes a fireproof block, a cylindrical member made of porous brick embedded in the block and having an open top end, and the solid electrolyte fitted into the opening of the cylindrical member and containing the standard electrode. , and cooling gas pipe means communicating between the outside of the molten steel container and the cylindrical member, the apparatus for measuring dissolved oxygen in molten steel according to claim 1.
極と上記溶鋼極とを電気的に接続することを特徴とする
特許請求の範囲第２項に記載の溶鋼中の溶存酸素測定装
置。(3) Measurement of dissolved oxygen in molten steel according to claim 2, wherein the lead wire passes through the pipe means and electrically connects the standard electrode and the molten steel electrode. Device.
材内にアルゴンガスが流入されることを特徴とする特許
請求の範囲第２項または第３項に記載の溶鋼中の溶存酸
素測定装置。(4) The apparatus for measuring dissolved oxygen in molten steel according to claim 2 or 3, wherein argon gas is introduced into the porous brick cylindrical member by the pipe means.
がＡｌ＿２Ｏ＿３でつつまれ、さらにその外部をインコ
ネル被覆で覆ったことを特徴とする特許請求の範囲第１
項乃至第４項に記載の溶鋼中の溶存酸素測定装置。(5) Claim 1, characterized in that the lead wire is a Mo wire, the surface of which is covered with Al_2O_3, and the outside thereof is further covered with an Inconel coating.
5. Dissolved oxygen measuring device in molten steel according to Items 4 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61060147A JPS62215862A (en) | 1986-03-18 | 1986-03-18 | Apparatus for measuring dissolved oxygen in molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61060147A JPS62215862A (en) | 1986-03-18 | 1986-03-18 | Apparatus for measuring dissolved oxygen in molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62215862A true JPS62215862A (en) | 1987-09-22 |
Family
ID=13133743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61060147A Pending JPS62215862A (en) | 1986-03-18 | 1986-03-18 | Apparatus for measuring dissolved oxygen in molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62215862A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0385436A (en) * | 1989-08-30 | 1991-04-10 | Nkk Corp | Measuring sensor of concentration of solute element in molten metal |
-
1986
- 1986-03-18 JP JP61060147A patent/JPS62215862A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0385436A (en) * | 1989-08-30 | 1991-04-10 | Nkk Corp | Measuring sensor of concentration of solute element in molten metal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8479579B2 (en) | Measuring probes for measuring and taking samples with a metal melt | |
| US3463005A (en) | Immersion molten metal sampler device | |
| US5495746A (en) | Gas analyzer for molten metals | |
| US4003814A (en) | Apparatus for the continuous measurement of the oxygen content of molten copper or alloys thereof | |
| US3574598A (en) | Method for controlling basic oxygen steelmaking | |
| US6156174A (en) | Immersion sensor for measuring an electrochemical activity | |
| US6309442B1 (en) | Refractory material sensor for determining level of molten metal and slag and method of using | |
| JPS62215862A (en) | Apparatus for measuring dissolved oxygen in molten steel | |
| US5792329A (en) | Apparatus to measure an electro-chemical activity | |
| US3505062A (en) | Method for positioning an oxygen lance | |
| JPH01267426A (en) | Method and apparatus for temperature measurement of molten metal | |
| JP6077636B1 (en) | Oxygen sensor and method for manufacturing oxygen sensor | |
| JP2004125566A (en) | Measuring method of molten steel layer surface position, slag layer thickness or both values, its device and probe used therefor | |
| JPH0829379A (en) | Sensor for measuring quantity of hydrogen dissolved in molten metal | |
| JPH0339701Y2 (en) | ||
| JPS5925582Y2 (en) | Continuous measuring device for molten steel oxygen level during continuous casting | |
| JPH0238932A (en) | Continuous temperature measuring method for molten metal | |
| JPH0318945Y2 (en) | ||
| Mugita et al. | Development of probes for electrochemical measurement of free oxygen content in liquid steel and its application | |
| IHIDA et al. | Electrochemical Rapid Determination of Oxygen Content of Liquid Steel in Commercial LD Converter | |
| JPH054928Y2 (en) | ||
| JPH044214Y2 (en) | ||
| JPS63273055A (en) | Probe for measuring density of impurity element in molten iron | |
| JPS6188139A (en) | Continuous measuring method of dissolved oxygen in molten metal | |
| KR20050111422A (en) | Complex probe for level measurement of melting iron |