JPH11229028A - Lining structure of vacuum degassing apparatus for molten steel - Google Patents
Lining structure of vacuum degassing apparatus for molten steelInfo
- Publication number
- JPH11229028A JPH11229028A JP4870898A JP4870898A JPH11229028A JP H11229028 A JPH11229028 A JP H11229028A JP 4870898 A JP4870898 A JP 4870898A JP 4870898 A JP4870898 A JP 4870898A JP H11229028 A JPH11229028 A JP H11229028A
- Authority
- JP
- Japan
- Prior art keywords
- lining
- molten steel
- refractory
- vacuum degassing
- side wall
- 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
Landscapes
- 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、真空脱ガス装置の
内張り構造に関する。The present invention relates to a lining structure of a vacuum degassing apparatus.
【０００２】[0002]
【従来の技術】溶鋼処理に使用される真空脱ガス装置の
形式は種々提案されているが、現在の主流はＲＨ式の真
空脱ガス装置である。ＲＨ式は下端に二本のシュノーケ
ルを備え、ガスリフトと減圧操作によって取鍋内の溶鋼
を真空槽内に循環し、溶鋼の脱ガス清浄化を図る。2. Description of the Related Art Various types of vacuum degassing devices used for molten steel processing have been proposed, but the current mainstream is an RH type vacuum degassing device. The RH type is equipped with two snorkels at the lower end, and circulates the molten steel in the ladle into the vacuum chamber by a gas lift and a decompression operation to degas and clean the molten steel.
【０００３】このＲＨ式溶鋼真空脱ガス装置（以下、単
に真空脱ガス装置と称する）の内張りは従来、レンガ積
みで行なわれてきたが、内張り作業の省力化などを目的
として、不定形耐火物化が検討されている（例えば特開
平９−２７９２２２号公報、特開平９−２７９２２３号
公報を参照）。[0003] This RH type molten steel vacuum degassing apparatus (hereinafter, simply referred to as a vacuum degassing apparatus) has conventionally been laid with bricks, but for the purpose of saving labor of the lining work, it is made of irregular-shaped refractory material. (For example, see JP-A-9-279222 and JP-A-9-279223).
【０００４】[0004]
【発明が解決しようとする課題】真空脱ガス装置におけ
る真空槽の構造は高さ方向に長尺で且つ密閉構造であ
る。真空槽は、内張りの施工を容易にするため、上下に
複数分割可能となっている。例えば上下の二分割あるい
は上中下の三分割が一般的である。The structure of the vacuum chamber in the vacuum degassing apparatus is long in the height direction and has a closed structure. The vacuum chamber can be vertically divided into a plurality of pieces in order to facilitate the construction of the lining. For example, upper and lower two divisions or upper, middle and lower three divisions are common.
【０００５】図２は、真空槽の分割部のうち最下部とな
る下部槽（１）について、内張り全体をれんが積みとし
た従来構造の縦断面図である。（２）は、この下部槽
（１）の下端に備えられたシュノーケルである。また、
シュノーケルのうち溶鋼浸漬部は浸漬管（３）と称さ
れ、フランジ（４）をもって着脱自在の構造となってい
る。同図は真空脱ガス装置の稼働時において、向かって
左側のシュノーケルから溶鋼（７）を真空槽（５）に導
入し、右側のシュノーケルから排出する場合を模式的に
示したものである。FIG. 2 is a longitudinal sectional view of a conventional structure in which the entire lower lining of the lower tank (1), which is the lowermost part among the divided parts of the vacuum tank, is piled with bricks. (2) is a snorkel provided at the lower end of the lower tank (1). Also,
The portion of the snorkel that is immersed in the molten steel is called an immersion tube (3) and has a detachable structure with a flange (4). The figure schematically shows a case where the molten steel (7) is introduced into the vacuum tank (5) from the snorkel on the left side and discharged from the snorkel on the right side when the vacuum degassing apparatus is operating.
【０００６】なお、同図では真空槽（５）の減圧と共に
左側のシュノーケルに設けた不活性ガス導入管（６）か
らＡｒガスを導入することにより、左側のシュノーケル
から真空槽（５）内に溶鋼を導入しているが、内張り耐
火物の損耗は溶鋼が導入される側が先行することから、
内張り耐火物の損耗の均一化を図るために、時期を見計
らって溶鋼の導入を左右逆のシュノーケルにすることが
行なわれている。[0006] In the same figure, by depressurizing the vacuum tank (5) and introducing Ar gas from an inert gas inlet pipe (6) provided in the left snorkel, the left snorkel enters the vacuum tank (5). Although molten steel has been introduced, the wear of the refractory lining is due to the fact that the molten steel is introduced first,
In order to equalize the wear of the refractory lining, the introduction of molten steel is reversed right and left at the right time.
【０００７】真空脱ガス炉の内張りの実質的な損耗個所
は、溶鋼が直接接触するこの下部槽の内張りである。し
たがって下部槽の内張りは他の部位に比べて損耗に伴う
更新回数が多いことから、迅速かつ容易に施工できる不
定形耐火物の使用が有効である。そこで、真空脱ガス装
置の内張りの不定形耐火物化の検討は、下部槽を中心に
進められている。しかし、不定形耐火物は組織強度が小
さく、レンガ積みに比べて耐用性に劣ることは否めず、
真空脱ガス炉内張りにおける不定形耐火物化を阻んでい
る。[0007] A substantial wear point of the lining of the vacuum degassing furnace is the lining of this lower tank where the molten steel comes into direct contact. Therefore, since the lining of the lower tank is frequently renewed due to wear as compared with other parts, it is effective to use an irregular-shaped refractory which can be constructed quickly and easily. Therefore, the study of making the lining of the vacuum degassing apparatus into an irregular refractory has been advanced mainly in the lower tank. However, amorphous refractories have a small structural strength and their durability is inferior to brickwork.
This prevents irregular refractories from being formed in the vacuum degassing furnace lining.
【０００８】[0008]
【課題を解決するための手段】真空槽（５）は密閉され
ているが、槽内の減圧によって一部大気の侵入は免れな
い。図２における矢印は大気の侵入経路を示したもので
ある。Although the vacuum chamber (5) is sealed, the invasion of the atmosphere is unavoidable due to the reduced pressure in the chamber. The arrows in FIG. 2 indicate the entry routes of the atmosphere.
【０００９】シュノーケルの浸漬管は外殻鉄皮がないた
め、耐火物が露出している。大気はこの浸漬管（３）外
周の耐火物組織の気孔から侵入し、芯金（８）の下端を
迂回して真空槽の内張り（９）の背面に到達した後、れ
んが目地部を通過して真空槽内に（５）侵入する。下部
槽の内張りのうち、溶鋼接触部は溶鋼圧によって大気の
侵入が阻止されることで、大気の真空槽内への侵入は溶
鋼湯面（１０）より上方の位置からとなる。[0009] Since the snorkel dip tube has no outer shell, the refractory is exposed. The air enters through the pores of the refractory structure on the outer periphery of the immersion pipe (3), bypasses the lower end of the cored bar (8), reaches the back of the lining (9) of the vacuum chamber, and then passes through the brick joint. (5) into the vacuum chamber. Of the lining of the lower tank, the molten steel contact portion is prevented from entering the atmosphere by the molten steel pressure, so that the atmosphere enters the vacuum tank from a position above the molten steel surface (10).
【００１０】下部槽の内張り（９）において、溶鋼湯面
（１０）より上方でしかも溶鋼湯面の近傍（１１）は溶
鋼スプラッシュを浴びる。そして、内張りに付着したス
プラッシュは内張りの目地から侵入する大気中の酸素と
反応して高熱を発生し、図のように目地およびその周辺
の耐火物組織が先行的に損傷させる。In the lining (9) of the lower tank, the molten steel splash is applied above the molten steel surface (10) and in the vicinity (11) of the molten steel surface. Then, the splash attached to the lining reacts with oxygen in the air entering from the joint of the lining to generate high heat, and as a result, the joint and the refractory structure around the joint are damaged in advance as shown in the figure.
【００１１】そこで、スプラッシュの高熱の発生原因と
なる目地からの大気侵入を防止するため、下部槽の内張
り全体を目地のない不定形耐火物の一体化構造にするこ
とが考えられる。しかし、真空脱ガス装置は下方にシュ
ノーケルを備えた構造のためか、装置の稼働により内張
りは加熱冷却の繰り返しに伴って、不定形耐火物による
一体化構造では内張りに大亀裂が生じ、湯漏れなどの懸
念から内張りの信頼性が大きく低下する。Therefore, in order to prevent the invasion of air from joints that cause high heat of the splash, it is conceivable to make the entire lining of the lower tank an integral structure of an unshaped refractory without joints. However, because the vacuum degassing device has a structure with a snorkel below, the operation of the device causes repeated cracking of the lining due to repeated heating and cooling, and the integrated lining made of irregular refractories causes large cracks in the lining, Such concerns greatly reduce the reliability of the lining.
【００１２】本発明は下部槽の内張りの不定形耐火物化
において、上記の問題を解決したものである。その特徴
とするところは、下端に二本のシュノーケルを備えた溶
鋼真空脱ガス装置の下部槽側壁の内張りにおいて、溶鋼
湯面より下方に目地を設けた溶鋼真空脱ガス装置の内張
り構造である。また、この内張り構造において、下部槽
側壁の内張りを不定形耐火物とし、該不定形耐火物の耐
火骨材がマグネシア０．５〜２０重量％、スピネル０〜
８９．５重量％、アルミナ１０〜９９重量％を含む場合
は、問題解決の面でより一層好適である。The present invention has been made to solve the above-mentioned problem in making the lower tank lining into an irregular refractory material. The feature is a lining structure of a molten steel vacuum degassing apparatus in which joints are provided below a molten steel surface in a lining of a lower tank side wall of the molten steel vacuum degassing apparatus having two snorkels at a lower end. In this lining structure, the lining of the lower tank side wall is made of an irregular refractory, and the refractory aggregate of the irregular refractory is composed of 0.5 to 20% by weight of magnesia,
A case containing 89.5% by weight and 10 to 99% by weight of alumina is more preferable in terms of solving problems.
【００１３】本発明は溶鋼湯面より下方に目地を設けた
ことにより、真空槽下部槽内への大気侵入を防止すると
同時に、該下部槽側壁の内張りに生じる上下方向の熱膨
張収縮差を吸収緩和して亀裂発生を防止したことで、下
部槽の不定形耐火物化においてその耐用性を格段に向上
させたものである。According to the present invention, the joint is provided below the surface of the molten steel to prevent the invasion of the atmosphere into the lower chamber of the vacuum chamber and absorb the difference in thermal expansion and contraction in the vertical direction generated in the lining of the lower chamber side wall. By mitigating the cracks to prevent cracking, the durability of the lower tank in the formation of an irregular refractory has been remarkably improved.
【００１４】なお、溶鋼湯面より下方の目地は溶鋼圧に
よって真空槽内への大気の侵入が阻止される。そこで、
下部槽の内張りでの侵入を阻止された大気は、下部槽上
端のフランジあるいはその上方の内張りにおいて真空槽
内に侵入するが、これらの部位は溶鋼湯面からの距離が
大きく、溶鋼に洗われないため、付着したスプラッシュ
が空気と反応して高温を発生しても内張りの先行損傷は
ない。The joint below the surface of the molten steel is prevented from entering the vacuum chamber by the pressure of the molten steel. Therefore,
The atmosphere, which was prevented from entering the lower tank lining, enters the vacuum tank at the flange at the upper end of the lower tank or at the lining above the lower tank, but these parts are at a large distance from the molten steel surface and are washed by the molten steel. There is no premature damage to the lining even if the attached splash reacts with air to generate high temperatures.
【００１５】本発明において下部槽側壁の内張りを不定
形耐火物とし、該不定形耐火物の耐火骨材がマグネシア
０．５〜２０重量％、スピネル０〜８９．５重量％、ア
ルミナ１０〜９９重量％を含む場合は、下部槽内張りに
おける真空槽内への大気侵入防止の効果が大きくなり、
それに伴って溶鋼湯面の上方の先行損耗防止の効果がよ
り一層顕著なものとなる。これは、その使用中の高温下
で耐火骨材のアルミナとマグネシアとが反応し、スピネ
ル（ＭｇＯ・Ａｌ2Ｏ3）を生成し、その生成に伴う体積
膨張で組織を緻密化することで、大気の透過がより困難
になるためと思われる。In the present invention, the inner lining of the lower tank side wall is made of an irregular refractory, and the refractory aggregate of the irregular refractory is composed of 0.5 to 20% by weight of magnesia, 0 to 89.5% by weight of spinel, and 10 to 99% of alumina. When the weight percentage is included, the effect of preventing the air from entering the vacuum chamber in the lower tank lining increases.
Along with this, the effect of preventing preceding wear above the molten steel surface becomes even more remarkable. This is because alumina and magnesia of the refractory aggregate react under high temperature during use to generate spinel (MgO.Al 2 O 3 ) and densify the structure by volume expansion accompanying the generation. It is thought that the permeation of the atmosphere becomes more difficult.
【００１６】真空脱ガス装置の内張りの寿命は、溶鋼と
直接接触する下部槽の寿命に決定付けられる。本発明は
以上のようにこの下部槽の内張り構造に特徴を有してお
り、上部槽、シュノーケルなどの内張り構造は限定され
るものではない。[0016] The life of the lining of the vacuum degassing device is determined by the life of the lower tank in direct contact with the molten steel. As described above, the present invention is characterized by the lining structure of the lower tank, and the lining structure of the upper tank and the snorkel is not limited.
【００１７】[0017]
【発明の実施の形態】図１は本発明の実施の形態であ
り、要部となる下部槽についてその縦断面図を示したも
のである。図には省略したが、使用時には図２のように
浸漬管を備え、かつ上部槽に接続される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, and shows a longitudinal sectional view of a lower tank as a main part. Although not shown in the drawing, at the time of use, a dip tube is provided as shown in FIG. 2 and connected to the upper tank.
【００１８】この実施の形態では、下部槽（１）の内張
りにおいて側壁（１３）の全体を不定形耐火物とし、敷
部（１４）をれんが積みとした。これにより、目地は側
壁の下端部、すなわちと側壁と敷部との境界に下部槽
（１）の周方向にわたって必然的に形成される。In this embodiment, the entire side wall (13) of the lining of the lower tank (1) is made of an irregular refractory, and the floor (14) is made of brick. As a result, the joint is inevitably formed at the lower end of the side wall, that is, at the boundary between the side wall and the floor, over the circumferential direction of the lower tank (1).
【００１９】側壁には必要により、パーマれんがあるい
は断熱材（１２）を設ける。また、図には示していない
が、敷部を不定形耐火物をもって流し込み施工し、この
敷部の不定形耐火物が硬化したのを見計らって側壁を不
定形耐火物により流し込み施工してもよい。この場合
も、側壁と敷部との境界に自ずと目地が形成される。If necessary, a permanent brick or a heat insulating material (12) is provided on the side wall. Also, although not shown in the drawing, the laying portion may be cast with an irregular refractory, and the side wall may be poured with the irregular refractory in anticipation of the hardening of the irregular refractory of the laying portion. . Also in this case, joints are naturally formed at the boundary between the side wall and the laid portion.
【００２０】溶鋼湯面の位置の確認は、真空脱ガス装置
使用後の内張りの損耗状況から確認できる。また、真空
槽内の真空度とシュノーケルの高さ寸法などからも容易
に算出できる。一般的な溶鋼湯面は、側壁部において敷
部より４０〜３００ｍｍ上方の位置である。The position of the molten steel surface can be confirmed from the state of wear of the lining after using the vacuum degassing device. Further, it can be easily calculated from the degree of vacuum in the vacuum chamber and the height of the snorkel. The general molten steel surface is located at a position 40 to 300 mm above the laid portion on the side wall.
【００２１】本発明において目地の位置は、側壁におい
て溶鋼湯面より下方であればよく、例えば側壁において
溶鋼湯面相当部と敷部との間に目地を形成してもよい
が、溶鋼湯面から余裕を持って離すために、図２に示し
たように側壁の下端が好ましい。In the present invention, the joint may be positioned below the molten steel surface on the side wall. For example, the joint may be formed between the portion corresponding to the molten steel surface and the floor on the side wall. The lower end of the side wall is preferable as shown in FIG.
【００２２】本発明において目地の形成は、側壁に生じ
る熱膨張差による歪みを吸収するためのものであり、内
張り組織を縁切すればその効果が発揮される。このた
め、前記したように不定形耐火物とれんが積みとの境
界、あるいは不定形耐火物同士であっても上下に区分け
して施工することによる境界を目地としてもよい。ま
た、側壁にベニア板、紙、合成樹脂板など目地形成材を
介在することで目地を形成してもよいが、目地への溶鋼
侵入を防止するために、その厚さはできる限り薄い方が
好まししく、例えば１ｍｍ以下とする。In the present invention, the joints are formed to absorb the distortion caused by the difference in thermal expansion generated in the side wall, and the effect is exhibited by cutting off the lining tissue. For this reason, as described above, the boundary between the irregular-shaped refractory and the brickwork, or the boundary formed by vertically dividing the irregular-shaped refractory and constructing the same may be used as the joint. The joints may be formed by interposing joint forming materials such as veneer, paper, and synthetic resin plates on the side walls, but the thickness should be as thin as possible to prevent molten steel from entering the joints. Preferably, it is, for example, 1 mm or less.
【００２３】本発明で使用する不定形耐火物は、従来の
流し込み施工用不定形耐火物と特に変わりなく、耐火骨
材および結合剤を主材とし、必要によってさらに有機繊
維、金属繊維、セラミック繊維、マイクロバルーン、金
属粉、分散剤、揮発シリカ、耐火性粗大粒などを添加し
てなる既知の流し込み施工用耐火物が使用できる。結合
剤の具体例は、アルミナセメント、マグネシアセメン
ト、シリカゾル、アルミナゾルなどが使用できる。The irregular refractory used in the present invention is not particularly different from the conventional irregular refractory for casting, mainly comprising a refractory aggregate and a binder, and further comprising organic fibers, metal fibers, and ceramic fibers as required. A known refractory for pouring construction, to which microballoons, metal powders, dispersants, volatile silica, refractory coarse particles, etc. are added can be used. Specific examples of the binder include alumina cement, magnesia cement, silica sol, and alumina sol.
【００２４】下部槽側壁の内張りを、耐火骨材がマグネ
シア０．５〜２０重量％、スピネル０〜８９．５重量
％、アルミナ１０〜９９重量％を含む不定形耐火物にし
た場合、本発明の効果が一層顕著となる。In the case where the refractory aggregate is made of an irregular refractory containing 0.5 to 20% by weight of magnesia, 0 to 89.5% by weight of spinel, and 10 to 99% by weight of alumina, the lining of the lower tank side wall is used. The effect is more remarkable.
【００２５】ここで耐火骨材としてのマグネシア、スピ
ネルおよびアルミナは、電融品、焼結品を問わない。ま
た、マグネシアには、例えばカルシア成分を４０重量％
以下の範囲で含むマグネシア−カルシア質も対象とな
る。Here, magnesia, spinel and alumina as refractory aggregates are not limited to electrofused products and sintered products. In addition, magnesia contains, for example, 40% by weight of a calcia component.
Magnesia-calcia in the following ranges are also included.
【００２６】各耐火骨材の割合は、マグネシアが０．５
重量％未満でアルミナが９９重量％を超えると熱膨張性
が不十分なためか、溶鋼湯面の上方部に見られる先行損
耗防止の効果が顕著ではない。マグネシアが２０重量％
を超え、アルミナが１０重量％未満では、スポーリング
性による亀裂の発生が懸念され、好ましくない。The ratio of each refractory aggregate is 0.5% for magnesia.
If the amount of alumina is less than 99% by weight and the amount of alumina exceeds 99% by weight, the effect of preventing the preceding wear seen above the molten steel surface is not remarkable, probably due to insufficient thermal expansion. 20% by weight magnesia
If the alumina content is less than 10% by weight, cracks due to spalling may occur, which is not preferable.
【００２７】スピネルはＭｇＯ・Ａｌ2Ｏ系スピネルを主
成分とするものであり、不定形耐火物に対する溶鋼浸透
の防止によって耐食性向上の効果をもつ。８９．５重量
％を超えるとその分、前記したマグネシアとアルミナの
割合が少なくなって不定形耐火物使用中のスピネル生成
量の低減を招き、溶鋼湯面の上方部の先行損耗防止の効
果が不十分となる。The spinel is mainly composed of a MgO.Al 2 O-based spinel, and has an effect of improving corrosion resistance by preventing molten steel from penetrating into an amorphous refractory. When the content exceeds 89.5% by weight, the proportion of magnesia and alumina decreases by that amount, resulting in a reduction in the amount of spinel generated during the use of the amorphous refractory, and the effect of preventing the leading wear of the upper part of the molten steel surface. Will be insufficient.
【００２８】耐火骨材の粒度は流し込み施工時の流動
性、施工体の緻密性などを考慮して、流し込み施工用耐
火物における従来技術と同様に、粗粒、中粒、微粒に調
整する。また、結合剤、有機繊維、耐火粗大粒子などの
添加割合などについても従来技術と特に変わりない。例
えば結合剤はアルミナセメントを耐火骨材１００重量％
に対する外掛けで例えば１〜１５重量％添加する。The particle size of the refractory aggregate is adjusted to coarse, medium, and fine particles in the same manner as in the prior art for the refractory for pouring work in consideration of the fluidity during pouring and the denseness of the construction. Further, the addition ratio of the binder, the organic fiber, the refractory coarse particles, and the like are not particularly different from those of the conventional technology. For example, the binder is alumina cement with 100% by weight of refractory aggregate.
For example, 1 to 15% by weight is added.
【００２９】[0029]
【実施例】以下の実施例および比較例は、ＲＨ式の真空
脱ガス装置の下部槽を対象とした。下部槽の寸法は、耐
火物内張り後において、内径２０００ｍｍ×高さ２５０
０ｍｍ。内張りの厚さは、背面に設けた厚さ２５ｍｍの
断熱ボードを含み４５０ｍｍとした。試験では、３００
ｔ溶鋼取鍋について、３００チャージの溶鋼処理を行っ
た。The following examples and comparative examples are directed to the lower tank of an RH type vacuum degassing apparatus. The dimensions of the lower tank, after the refractory lining, inner diameter 2000mm × height 250
0 mm. The thickness of the lining was 450 mm including a heat insulating board of 25 mm thickness provided on the back surface. In the test, 300
The t molten steel ladle was subjected to a 300 charge molten steel treatment.
【００３０】表１は、表２で示す実施例および比較例で
使用した内張り耐火物の組成である。符号Ａ〜Ｇは流し
込み施工用不定形耐火物であり、施工時には水分を外掛
け５．５重量％添加し、混練後、型枠を使用して下部槽
に直接施工した。Table 1 shows the compositions of the refractory linings used in Examples and Comparative Examples shown in Table 2. Symbols A to G are irregular-shaped refractories for pouring work, and at the time of working, 5.5% by weight of water was added over the outside, and after kneading, the work was directly applied to the lower tank using a formwork.
【００３１】表２において、実施例１〜７は下部槽の側
壁全体を流し込み施工をもって不定形耐火物による一体
構造とし、敷部をれんが積みとしたものである。実施例
８は敷部、側壁ともに不定形耐火物による内張りとした
ものであり、敷部を流し込み施工後、次いで側壁を流し
込み施工した。比較例１は側壁および敷部ともにれんが
積みとした。比較例２は下部槽全体を不定形耐火物の一
体構造とした（側壁と敷部との間に目地がない）。In Table 2, in Examples 1 to 7, the entire side wall of the lower tank was cast into an integral structure made of an irregular refractory material, and the floor was made of brick. In Example 8, both the laying portion and the side wall were made of a refractory lining, and after the laying portion was cast, the side wall was cast. In Comparative Example 1, both the side wall and the floor portion were brick. In Comparative Example 2, the entire lower tank had an integral structure of an amorphous refractory (there was no joint between the side wall and the floor).
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【表２】 [Table 2]
【００３４】試験結果が示すように実施例１〜８は従来
構造において見られた溶鋼湯面より上方の先行損耗がき
わめて少なく、すぐれた耐用性が得られた。この中でも
１〜５および実施例８は特に耐用性に優れている。側壁
の不定形耐火物の材質がアルミナ質の実施例６とマグネ
シアが多くアルミナの割合が少ない実施例７は、溶鋼湯
面より上方の局部損耗が他の実施例より大きく、耐用性
においても劣る。As can be seen from the test results, Examples 1 to 8 showed very little pre-abrasion above the molten steel surface seen in the conventional structure, and excellent durability was obtained. Among them, Examples 1 to 5 and Example 8 are particularly excellent in durability. In Example 6 in which the material of the amorphous refractory of the side wall is alumina, and Example 7 in which magnesia is large and the proportion of alumina is small, the local wear above the molten steel surface is larger than in the other examples, and the durability is inferior. .
【００３５】これに対し下部槽全体をれんが積みにした
比較例１は、内張り全体としては損耗が少ないが、溶鋼
湯面より上方のれんが目地の損耗速度が大きく、結局は
これが原因で耐用性に劣る。なお、この比較例１は内張
りの全体がれんが積みであることから、施工性にも劣
る。On the other hand, in Comparative Example 1 in which the entire lower tank was made of brick, the wear was small in the entire lining, but the wear rate of the brick joint above the molten steel surface was large, and eventually the durability was lowered due to this. Inferior. In Comparative Example 1, the workability was inferior because the entire lining was brickwork.
【００３６】下部槽全体を不定形耐火物の一体構造とし
た比較例２は側壁の下部をを中心として亀裂の発生が著
しく、これが原因と思われる先行溶損によって耐用性に
劣る。In Comparative Example 2 in which the entire lower tank was made of an integral structure of an amorphous refractory, cracks were remarkably generated mainly at the lower portion of the side wall, and the durability was deteriorated due to premature erosion considered to be the cause.
【００３７】[0037]
【発明の効果】本発明による得られる効果は、以上のよ
うに下部槽内張りにおける溶鋼湯面の上方の先行損傷の
防止という真空脱ガス装置特有の問題を解決したもので
ある。また、本発明で使用する不定形耐火物の材質を限
定することで、その効果は一段と向上する。真空脱ガス
装置の内張りの不定形耐火物化のニーズは、内張り施工
の省力化から今後ますます高まることが予想され、こう
した背景からも本発明の産業的価値はきわめて高い。The effect obtained by the present invention solves the problem peculiar to the vacuum degassing apparatus, that is, the prevention of the pre-damage above the molten steel surface in the lower tank lining as described above. In addition, the effect is further improved by limiting the material of the irregular shaped refractory used in the present invention. It is expected that the need for making the lining of the vacuum degassing apparatus into an irregular refractory will increase in the future due to the labor saving of the lining work, and from such a background, the industrial value of the present invention is extremely high.
【図１】本発明の実施の形態を示す下部槽の縦断面図。FIG. 1 is a longitudinal sectional view of a lower tank showing an embodiment of the present invention.
【図２】ＲＨ式真空脱ガス装置の要部の縦断面図。FIG. 2 is a longitudinal sectional view of a main part of an RH type vacuum degassing apparatus.
１ 下部槽 ２ シュノーケル ３ 浸漬管 ４ フランジ ５ 真空槽 ６ 不活性ガス導入管 ７ 溶鋼 ８ 芯金 ９ 内張り １０ 溶鋼湯面 １１ 溶鋼湯面の近傍 １２ 断熱材 １３ 側壁 １４ 敷部 DESCRIPTION OF SYMBOLS 1 Lower tank 2 Snorkel 3 Immersion pipe 4 Flange 5 Vacuum tank 6 Inert gas introduction pipe 7 Molten steel 8 Core metal 9 Inner lining 10 Molten steel surface 11 Near the molten metal surface 12 Insulation material 13 Side wall 14 Laying part
Claims (2)
真空脱ガス装置の下部槽側壁の内張りにおいて、溶鋼湯
面より下方に目地を設けた溶鋼真空脱ガス装置の内張り
構造。1. A lining structure of a vacuum degassing apparatus for molten steel in which joints are provided below a molten steel surface in a lining of a lower tank side wall of the vacuum degassing apparatus for molten steel having two snorkels at a lower end.
し、該不定形耐火物の耐火骨材がマグネシア０．５〜２
０重量％、スピネル０〜８９．５重量％、アルミナ１０
〜９９重量％を含む請求項１記載の溶鋼真空脱ガス装置
の内張り構造。2. A lining of the lower tank side wall is made of an irregular refractory, and the refractory aggregate of the irregular refractory is magnesia 0.5 to 2
0% by weight, spinel 0-89.5% by weight, alumina 10
The lining structure of a vacuum degassing apparatus for molten steel according to claim 1, which comprises about 99% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4870898A JPH11229028A (en) | 1998-02-14 | 1998-02-14 | Lining structure of vacuum degassing apparatus for molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4870898A JPH11229028A (en) | 1998-02-14 | 1998-02-14 | Lining structure of vacuum degassing apparatus for molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11229028A true JPH11229028A (en) | 1999-08-24 |
Family
ID=12810827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4870898A Pending JPH11229028A (en) | 1998-02-14 | 1998-02-14 | Lining structure of vacuum degassing apparatus for molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11229028A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100825553B1 (en) * | 2001-10-26 | 2008-04-25 | 주식회사 포스코 | An apparatus for protecting the brick of vessel in degassing vacuum |
| KR20160079239A (en) * | 2014-12-26 | 2016-07-06 | 주식회사 포스코 | Refractory for installation producing alloy steel containing manganese and manufacturing method thereof |
-
1998
- 1998-02-14 JP JP4870898A patent/JPH11229028A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100825553B1 (en) * | 2001-10-26 | 2008-04-25 | 주식회사 포스코 | An apparatus for protecting the brick of vessel in degassing vacuum |
| KR20160079239A (en) * | 2014-12-26 | 2016-07-06 | 주식회사 포스코 | Refractory for installation producing alloy steel containing manganese and manufacturing method thereof |
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