JP2003171716A - Method for removing metal adhering to vacuum degassing tank - Google Patents
Method for removing metal adhering to vacuum degassing tankInfo
- Publication number
- JP2003171716A JP2003171716A JP2001373550A JP2001373550A JP2003171716A JP 2003171716 A JP2003171716 A JP 2003171716A JP 2001373550 A JP2001373550 A JP 2001373550A JP 2001373550 A JP2001373550 A JP 2001373550A JP 2003171716 A JP2003171716 A JP 2003171716A
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- Prior art keywords
- vacuum degassing
- low carbon
- carbon steel
- steel
- treatment
- 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.)
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Links
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【発明の関係する技術の分野】この発明は、低炭素鋼、
極低炭素鋼の製造方法に供される真空脱ガス槽の地金除
去方法に係り、特に真空脱ガス処理を施す際に生じる鋼
中炭素[C]や鋼中酸素[O]の再上昇を防止するための真空
脱ガス槽付着地金の除去方法に関する。This invention relates to low carbon steel,
Regarding the method of removing the metal in the vacuum degassing tank used for the production of ultra-low carbon steel, especially the re-elevation of carbon [C] and oxygen [O] in steel that occur during vacuum degassing treatment. The present invention relates to a method for removing the metal adhered in a vacuum degassing tank for preventing it.
【０００２】[0002]
【従来の技術】自動車用鋼板や缶用鋼板に用いられる鋼
は、加工性が非常に重視されるため炭素(C)の含有率を
質量比で0.0025%以下のように極度に低下させることが
要求される。このような極低炭素鋼は、転炉による通常
の脱炭精錬のみでは、歩留まりが悪くなり、また、精錬
時間が長くなるので、真空脱ガス槽を用い、必要に応じ
て槽内に酸素ガスを吹き込んで、減圧下でCO反応を活発
に行わせて脱炭の進行を図って製造される。BACKGROUND OF THE INVENTION Steel used for steel sheets for automobiles and steel sheets for cans is extremely important in workability, and therefore the carbon (C) content can be extremely reduced to 0.0025% by mass or less. Required. Such ultra-low carbon steel has a poor yield and a long refining time only when it is subjected to normal decarburization and refining in a converter, so a vacuum degassing tank is used. It is manufactured by blowing carbon dioxide to actively carry out CO reaction under reduced pressure to promote decarburization.
【０００３】このような真空脱炭により極低炭素鋼等を
溶製するに当たっての問題点の一つは、当該極低炭素鋼
等を溶製するとき、それ以前に溶製した高炭素鋼等の地
金が真空脱ガス槽内に付着し、その地金が高純度鋼であ
る極低炭素鋼等を溶製する際に落下、あるいは再溶解し
て溶製中の極低炭素鋼中のCや酸素[O]の含有率を再上昇
させること（以下、Cピックアップ、Oピックアップとい
う）である。特に脱炭反応が進行して溶鋼組成が極低炭
素域になったときに上記現象が起こると、製品の規格は
ずれを惹起する。そのため、極低炭素鋼を真空脱炭処理
するときには、種々の方法で、例えば、実公平7-40509
号公報に提案されているように地金を予め除去すること
が行われる。One of the problems in melting ultra-low carbon steel or the like by vacuum decarburization is that when the ultra-low carbon steel or the like is melted, high-carbon steel or the like melted before that is melted. Of metal adheres to the vacuum degassing tank, and when the metal ingot melts ultra-low carbon steel that is high-purity steel It is to raise the content rate of C and oxygen [O] again (hereinafter referred to as C pickup and O pickup). In particular, if the above phenomenon occurs when the decarburization reaction progresses and the molten steel composition reaches the extremely low carbon range, the specification of the product is deviated. Therefore, when vacuum decarburizing ultra-low carbon steel, various methods such as
Preliminary removal of the metal is carried out as proposed in the publication.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記公
報に提案されているような手段をすべての真空脱炭精錬
において行うことは処理経費の増大を招き、また、真空
脱ガス装置の使用スケジュールを乱して現実的ではな
く、さらに仮に実行したとしても完全に地金を除去でき
るわけではないので、極低炭素鋼の溶製の際に生ずる汚
染を完全には防止できない。本発明は、真空脱ガス装置
の使用スケジュールを乱したり経費の増大をもたらすこ
となく、また、CピックアップやOピックアップを生ずる
ことなく、極低炭素鋼を確実に製造しうる真空脱ガス槽
付着地金の除去方法を提案することを目的とする。However, performing the means proposed in the above publication in all vacuum decarburization refining causes an increase in processing cost and disturbs the use schedule of the vacuum degassing apparatus. It is not realistic, and even if it is carried out, it is not possible to completely remove the ingot, so it is not possible to completely prevent the pollution that occurs during the melting of the ultra-low carbon steel. INDUSTRIAL APPLICABILITY The present invention does not disturb the use schedule of the vacuum degassing device or increase the cost, and does not cause C pickup or O pickup. The purpose is to propose a method of removing metal.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、真空脱ガ
ス槽付着地金を除去するに際し、従来の如く、機械的手
段によらず真空脱ガス処理（真空脱ガス方式としてRH
式、DH式を含む）に供する比較的低炭素含有量の溶鋼に
より真空脱ガス槽内を洗浄すれば地金を効果的に除去で
きることに着目し、上記本発明の目的の達せられる条件
を探求して本発明を完成した。The inventors of the present invention, when removing the metal attached to the vacuum degassing tank, use the vacuum degassing process (RH degassing method as RH
(Including the DH formula), the ingot can be effectively removed by cleaning the inside of the vacuum degassing tank with molten steel having a relatively low carbon content, and the conditions for achieving the object of the present invention are sought. Then, the present invention was completed.
【０００６】本発明は、真空脱ガス槽内の溶鋼到達レベ
ル直上のフリーボード部に付着している地金を、低炭素
鋼溶鋼によるリムド処理によって溶解・除去するもので
ある。According to the present invention, the metal adhered to the freeboard portion immediately above the molten steel reaching level in the vacuum degassing tank is melted and removed by the riming treatment with the low carbon steel molten steel.
【０００７】上記発明において、極低炭素鋼溶鋼の溶製
に先立って低炭素鋼溶鋼のリムド処理によって行うこと
により、より安定した極低炭素鋼の製造を可能になる。
その際、上記低炭素鋼溶鋼のリムド処理を、質量比で
C：0.02〜0.10%、O：50ppm以上を含有する溶鋼によって
行うことが好適である。In the above invention, by carrying out the riming treatment of the low carbon steel molten steel prior to the melting of the ultra low carbon steel molten steel, it becomes possible to more stably manufacture the ultra low carbon steel.
At that time, the rimmed treatment of the above-mentioned low carbon steel molten steel was performed in a mass ratio.
It is suitable to use molten steel containing C: 0.02 to 0.10% and O: 50 ppm or more.
【０００８】また、本発明においては、上記低炭素鋼溶
鋼のリムド処理を、継続して２回以上行うか、あるいは
10min以上継続するリムド処理を少なくとも１回以上行
うことが好適であり、これにより真空脱ガス処理の際に
[C]および[O]の再上昇が起こることを確実に防止して、
安定した極低炭素鋼の製造が可能になる。Further, in the present invention, the rimming treatment of the low carbon steel molten steel is continuously performed twice or more, or
It is preferable to perform the rimming treatment that continues for 10 minutes or more at least once, which allows for vacuum degassing treatment.
Be sure to prevent the rise of [C] and [O],
It enables stable production of ultra-low carbon steel.
【０００９】[0009]
【発明の実施の形態】以下、本発明をその実施手順に沿
って説明する。図１は本発明を実施するときの転炉と真
空脱ガス装置の稼働順序を、RH真空脱ガス装置を例とし
て、模式的に示す説明図である。ここに示すように本発
明では、極低炭素鋼の溶製に先立ち、低炭素鋼用溶鋼の
溶製が転炉で行われ、RH真空脱ガス装置によってリムド
処理される（ステージI）。リムド処理とは、溶鋼中にC
に比してOを大量に含んだ溶鋼を真空処理し活発なC＋1/
2O２→CO反応を進行させる操作をいう。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in accordance with its procedure of implementation. FIG. 1 is an explanatory diagram schematically showing the operating sequence of a converter and a vacuum degassing apparatus when carrying out the present invention, using a RH vacuum degassing apparatus as an example. As shown here, in the present invention, prior to the melting of the ultra low carbon steel, the melting of the low carbon steel is melted in a converter and rimmed by a RH vacuum degasser (stage I). Rimudo treatment means C in molten steel.
Compared with the above, the molten steel containing a large amount of O is vacuum-processed and active C + 1 /
2O 2 → CO means an operation that advances the reaction.
【００１０】この処理は後に説明する条件にしたがい、
必要な時間に亘り、必要な回数繰り返し（ステージI
I）、これによって、それ以前の真空脱ガス処理の際にR
H脱ガス槽の溶鋼到達レベル直上に付着していた地金を
溶解・除去する。ついで、転炉で極低炭素用溶鋼の溶製
を行い、出鋼後、RH真空脱ガス装置により脱炭反応を進
行させる（ステージIII）。This processing is performed according to the conditions described later,
Repeat as many times as necessary (Stage I
I), which allows R during earlier vacuum degassing processes.
H Dissolves and removes the metal that had adhered directly above the molten steel reaching level in the degassing tank. Then, molten steel for ultra-low carbon is smelted in a converter, and after tapping, a decarburizing reaction is advanced by an RH vacuum degassing device (stage III).
【００１１】本発明は、基本的に上記操業手順により行
われ、これによって真空脱ガス処理する際のCピックア
ップ、Oピックアップを防止することができるが、特に
以下の点に留意して操業を行うことが必要である。The present invention is basically carried out according to the above-mentioned operation procedure, whereby C pickup and O pickup at the time of vacuum degassing can be prevented, but the operation is carried out paying particular attention to the following points. It is necessary.
【００１２】まず、リムド処理に当たっては、それ以前
の真空脱ガス処理によってフリーボード上に形成されて
いた地金が低炭素溶鋼によって完全に溶解・除去される
ようにしなければならない。図２(a)は、例えば取鍋２
に受鋼された高炭素鋼溶鋼Ｍ １をRH脱ガス槽１内におい
てキルド処理による脱ガス処理を行う場合の槽内の模式
図であるが、ここに示すように真空脱ガス槽１内には、
溶鋼レベル直上に地金Ｓ１が付着する。この地金は、C
含有率が高く、この地金Ｓ１の付着した状態の装置を極
低炭素鋼の真空脱ガス処理に供すると、地金Ｓ１の再溶
解によるCピックアップが発生する。First, before the rimming process,
Formed on the freeboard by vacuum degassing process of
Metal was completely melted and removed by low carbon molten steel
Must be done. FIG. 2 (a) shows, for example, a ladle 2
High carbon steel M received by M 1In the RH degassing tank 1
Of the inside of the tank when degassing treatment is carried out
As shown here, in the vacuum degassing tank 1 as shown here,
Metal S immediately above the molten steel level1Adheres. This bullion is C
High content rate, this metal S1The device with the attached
When subjected to vacuum degassing of low carbon steel, the metal S1Remelting
The solution causes C pickup.
【００１３】したがって、リムド処理に当たっては、図
２(b)に示すように低炭素鋼の溶鋼Ｍ２が前回の高炭素
鋼の真空脱ガス処理において形成された真空脱ガス槽１
内の地金Ｓ１のレベルを超えて上昇するように行うこと
が必要である。その条件は、真空脱ガス処理される低炭
素鋼の〔C〕、〔O〕のバランス、真空脱ガス槽１内への
還流ガスの吹き込み量等によって変化するが、これらは
経験によって把握可能である。Therefore, in the rimming process, as shown in FIG. 2 (b), the molten steel M 2 of low carbon steel was formed in the previous vacuum degassing process of high carbon steel in the vacuum degassing tank 1.
It is necessary to do so as to rise above the level of the bullion S 1 in the above. The conditions vary depending on the balance of [C] and [O] of the low carbon steel to be vacuum degassed, the amount of reflux gas blown into the vacuum degassing tank 1, etc., but these can be grasped by experience. is there.
【００１４】上記の条件に加え、上記リムド処理は、以
下の条件を満足するように行うのが好ましい。まず、リ
ムド処理に供する低炭素鋼の溶鋼はC：0.02〜0.10%、
O：50ppm以上を含有するものとするのがよい。かかる組
成を有する溶鋼に真空脱ガス処理を施すと、いわゆるCO
反応によりリムド処理後の組成は、C：0.01〜0.04%を含
有することになる。リムド処理によっても図２(b)に示
すように、地金Ｓ２が真空脱ガス処理装置１内に付着す
るが、上記範囲内であれば、引き続く極低炭素鋼の処理
に支障を生じない。なお、好ましくは、低炭素鋼のC含
有率は0.02〜0.07%とするのがよい。この範囲では、リ
ムド処理後のC量は0.01〜0.03%となり、Cピックアップ
を一層確実に防止できるからである。In addition to the above conditions, it is preferable that the rimming process be performed so as to satisfy the following conditions. First, the molten steel of low carbon steel to be subjected to rimmed treatment is C: 0.02 to 0.10%,
O: It is preferable to contain 50 ppm or more. When molten steel having such a composition is subjected to vacuum degassing treatment, so-called CO
By the reaction, the composition after liming treatment contains C: 0.01 to 0.04%. As shown in FIG. 2 (b), the ingot S 2 adheres to the vacuum degassing apparatus 1 even by the rimming process, but within the above range, it does not hinder the subsequent processing of the ultra-low carbon steel. . The C content of the low carbon steel is preferably 0.02 to 0.07%. This is because in this range, the amount of C after the rimming treatment is 0.01 to 0.03%, and the C pickup can be more reliably prevented.
【００１５】さらに、低炭素鋼のリムド処理は、その処
理完了後に加炭処理を行わないようにし、そのため、製
品の目標C含有量を下回らないようにリムド処理を行う
ことが好ましい。リムド処理による脱炭後に加炭処理を
行うと、加炭の際に生じたC含有率の高い溶鋼による地
金付きが生じ、それが次に極低炭素鋼を処理する際のC
ピックアップの原因になるからである。Further, in the rimming treatment of the low carbon steel, it is preferable that the carburizing treatment is not performed after the treatment is completed, and therefore, the rimming treatment is performed so as not to fall below the target C content of the product. When carburization is performed after decarburization by rimmed treatment, molten steel with a high C content during carburization causes metal deposits, which causes C in the next ultra low carbon steel treatment.
This is the cause of pickup.
【００１６】加えて、リムド処理は、5min以上継続して
２回以上行うか、あるいは10min以上継続するリムド処
理を少なくとも１回以上行うことが好ましい。図３は、
処理能力250tの真空脱ガス装置を用い、溶鋼１t当たり
還流ガス流量を0.0059ｍ３（標準状態）／minとの条件
で処理したときの地金溶解・除去処理時間、処理回数と
極低炭素鋼におけるCピックアップの関係を示すグラフ
である。In addition, it is preferable that the rimming treatment is performed twice or more continuously for 5 minutes or more, or at least once or more rimming treatment is continued for 10 minutes or more. Figure 3
Using a vacuum degasser processing capacity 250t, 0.0059M the recirculated gas flow rate per molten steel 1t 3 (standard state) / min and bullion dissolving and removing process time when treated with the conditions of the process number and ultra-low carbon steel 5 is a graph showing the relationship of C pickup in FIG.
【００１７】極低炭素鋼におけるCピックアップは低炭
素鋼による地金溶解・除去回数が増すほど小さくなり、
２回以上行うと最大でも1ppm以下となる。また、地金溶
解・除去回数が１回の場合であっても、リムド処理時間
を10min以上継続させるとCピックアップが最大でも1ppm
となる。したがって、リムド処理時間が比較的短く、例
えば5minに満たない場合には、２回以上のリムド処理を
行うことが好ましく、一方、リムド処理の時間が十分に
長い場合、例えば10min以上継続する場合には、１回の
リムド処理によって地金の溶解・除去を行えばよい。も
ちろん、より多数回に亘ってリムド処理を繰り返して行
えば、より確実にCピックアップを防止できる。なお、
上記データはRH真空脱ガス装置によるものであるが、こ
れをDH式真空脱ガス装置に対して適用することもでき
る。The C pickup in ultra-low carbon steel becomes smaller as the number of times of melting and removing the metal in the low-carbon steel increases,
If it is performed twice or more, the maximum will be 1 ppm or less. Even if the number of times the metal is melted and removed is 1, the maximum C pickup is 1 ppm if the rimming treatment time is continued for 10 min or longer.
Becomes Therefore, if the rimming treatment time is relatively short, for example, less than 5 min, it is preferable to perform the limding treatment twice or more, while if the liming treatment time is sufficiently long, for example, if it continues for 10 min or more. The metal may be melted and removed by a single riming treatment. Of course, if the rimming process is repeated more times, the C pickup can be prevented more reliably. In addition,
Although the above data is based on the RH vacuum degassing device, it can also be applied to the DH type vacuum degassing device.
【００１８】前記の点に留意してリムド処理を行い、つ
いで極低炭素鋼の真空脱ガス処理を行えば、図２(c)に
示すように、RH脱ガス槽１のフリーボードには、高炭素
鋼を処理した場合に生成した地金Ｓ１はもはや存在せ
ず、Cピックアップが生ずることはない。なお、リムド
処理を行った場合にも、図２(b)に示すように地金Ｓ２
が生成するが、これは先にも述べたようにC含有率が低
いものであり、また、その生成部位が続く極低炭素鋼の
溶鋼レベルのかなり上方にあり、極低炭素鋼等を溶製す
るときのCピックアップの原因とはなり難い。When the riming treatment is carried out while paying attention to the above points, and then the vacuum degassing treatment of the ultra-low carbon steel is carried out, the freeboard of the RH degassing tank 1 is The bullion S 1 produced when processing high carbon steel is no longer present and no C pickup occurs. Even when performing rimmed processing, bullion S 2 as shown in FIG. 2 (b)
As described above, this is due to the low C content, and the generation site is considerably higher than the molten steel level of the ultra-low carbon steel that continues to melt the ultra-low carbon steel, etc. It is difficult to cause C pickup when manufacturing.
【００１９】図４は、地金溶解・除去処理時間としてリ
ムド処理時間を10minとして地金溶解・除去処理を行っ
たときの地金溶解・除去処理回数と真空脱ガス槽内付着
地金の除去率の関係を示すグラフである。処理条件は、
処理能力250tのRH真空脱ガス装置を用い、溶鋼1t当たり
還流ガス流量を0.0059ｍ（標準状態）／minとした。２
回以上の処理を行うことにより、地金除去率は95％以上
となりCおよびOのピックアップの原因となる地金の除去
が達成されている。FIG. 4 shows the number of times the metal is melted / removed and the amount of metal adhered in the vacuum degassing tank when the metal is melted / removed by setting the rimming process time to 10 min. It is a graph which shows the relationship of a rate. The processing conditions are
Using a RH vacuum degassing device with a processing capacity of 250 tons, the reflux gas flow rate per 1 ton of molten steel was set to 0.0059 m (standard state) / min. Two
By performing the treatment more than once, the metal removal rate becomes 95% or more, and the metal removal that causes C and O pickup is achieved.
【００２０】本発明では、このように低炭素鋼のリムド
処理により、付着地金の溶解・除去を行い、しかる後、
極低炭素鋼溶鋼の真空脱ガス処理を行う。すなわち、図
２(c)に示すように、取鍋２に極低炭素鋼用溶鋼Ｍ１を
転炉から受鋼し、これに対して真空脱ガス処理を行う。
この際、必要に応じて酸素上吹き用ランス３から酸素を
浴面上に吹きつけ脱炭の速やかな進行を図りうることは
当然である。According to the present invention, the adherent metal is melted and removed by the rimming treatment of the low carbon steel as described above, and thereafter,
Vacuum degassing of ultra low carbon molten steel is performed. That is, as shown in FIG. 2 (c), the molten steel M 1 for ultra low carbon steel was受鋼from the converter to the ladle 2, subjected to vacuum degassing treatment thereto.
At this time, as a matter of course, oxygen can be blown onto the bath surface from the lance 3 for blowing oxygen to accelerate decarburization.
【００２１】本発明は極低炭素鋼の製造に当たり広く適
用することができるが、特に、真空脱ガス処理後の最終
C含有率が25ppm以下の鋼種に適用すると効果が大きい。
このようなC含有率が極度に低い鋼種は、非常にCピック
アップを生じやすいが、本発明により規格はずれがほと
んど生じなくなくなるからである。Although the present invention can be widely applied to the production of ultra-low carbon steel, it is particularly applicable to the final product after vacuum degassing.
It is very effective when applied to steel grades with a C content of 25 ppm or less.
This is because such a steel type having an extremely low C content is very likely to cause C pickup, but the present invention causes almost no out-of-specification.
【００２２】[0022]
【発明の効果】本発明は、上記のように、真空脱ガス処
理により極低炭素鋼を溶製する際にCピックアップやOピ
ックアップの原因となる地金を予め低炭素鋼のリムド処
理によって溶解・除去する。その結果、真空脱ガス装置
の使用スケジュールを乱すことなく、C、Oのピックアッ
プをほぼ完全に防止することができる。As described above, the present invention melts the base metal that causes C pickup and O pickup when melting ultra low carbon steel by vacuum degassing by preliminarily liming the low carbon steel. ·Remove. As a result, pickup of C and O can be almost completely prevented without disturbing the use schedule of the vacuum degassing device.
【図１】 本発明を実施するときの転炉とRH真空脱ガス
装置の稼働順序を模式的に示す説明図である。FIG. 1 is an explanatory diagram schematically showing the operating sequence of a converter and an RH vacuum degassing apparatus when carrying out the present invention.
【図２】 本発明を実施する際の地金除去過程を示す説
明図である。FIG. 2 is an explanatory diagram showing a metal removal process when carrying out the present invention.
【図３】 本発明を実施する際の地金溶解・除去処理時
間、処理回数と極低炭素鋼におけるCピックアップの関
係を示すグラフである。FIG. 3 is a graph showing the relationship between the metal ingot melting / removing treatment time, the number of treatments and the C pickup in the ultra low carbon steel when the present invention is carried out.
【図４】 本発明を実施する際の地金溶解除去回数と槽
内地金除去率との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the number of times metal is dissolved and removed and the in-tank metal removal rate when the present invention is carried out.
１：RH脱ガス槽 ２：取鍋 ３：酸素上吹き用ランス Ｍ：処理溶鋼 Ｓ：地金 1: RH degassing tank 2: Ladle 3: Oxygen top blowing lance M: treated molten steel S: Bullion
───────────────────────────────────────────────────── フロントページの続き (72)発明者 野村 寛 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 Ｆターム(参考） 4K013 AA07 BA02 BA08 CE00 DA03 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiroshi Nomura 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Shi) Kawasaki Steel Co., Ltd. Mizushima Steel Works F-term (reference) 4K013 AA07 BA02 BA08 CE00 DA03
Claims (4)
フリーボード部に付着している地金を低炭素鋼溶鋼によ
るリムド処理によって溶解・除去することを特徴とする
真空脱ガス槽付着地金の除去方法。1. A vacuum degassing tank adhering place, characterized in that the metal adhered to the freeboard portion directly above the level where the molten steel reaches in the vacuum degassing tank is melted and removed by a riming treatment using low carbon steel molten steel. How to remove gold.
地金の除去を行うことを特徴とする請求項１記載の真空
脱ガス槽付着地金の除去方法。2. The vacuum degassing tank-adhering metal removal method according to claim 1, wherein the adhering metal-removing is carried out prior to the melting of the ultra-low carbon steel molten steel.
O:50ppm以上を含有する低炭素鋼用鋼によって行うこと
を特徴とする請求項１又は２記載の真空脱ガス槽付着地
金の除去方法。3. C: 0.02 to 0.10% by mass ratio of the rimmed treatment,
The method for removing metal in a vacuum degassing tank according to claim 1 or 2, wherein the method is performed by using a steel for low carbon steel containing O: 50 ppm or more.
２回以上行うか、あるいは10min以上継続するリムド処
理を少なくとも1回以上行うことを特徴とする請求項１
〜３の何れかに記載の真空脱ガス槽付着地金の除去方
法。4. The low-carbon steel molten steel is subjected to rimming treatment twice or more continuously, or rimming treatment continued for 10 minutes or more is performed at least once.
4. The method for removing the metal attached to the vacuum degassing tank according to any one of 1 to 3.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332398A (en) * | 2006-06-12 | 2007-12-27 | Kobe Steel Ltd | Method for producing high cleanliness steel |
| JP2009299087A (en) * | 2008-06-10 | 2009-12-24 | Kobe Steel Ltd | Method for manufacturing high alloy ultralow carbon steel |
| KR20220033821A (en) * | 2020-09-10 | 2022-03-17 | 주식회사 포스코 | Apparatus and method for processing molten material |
-
2001
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332398A (en) * | 2006-06-12 | 2007-12-27 | Kobe Steel Ltd | Method for producing high cleanliness steel |
| JP2009299087A (en) * | 2008-06-10 | 2009-12-24 | Kobe Steel Ltd | Method for manufacturing high alloy ultralow carbon steel |
| KR20220033821A (en) * | 2020-09-10 | 2022-03-17 | 주식회사 포스코 | Apparatus and method for processing molten material |
| KR102428005B1 (en) | 2020-09-10 | 2022-08-03 | 주식회사 포스코 | Apparatus and method for processing molten material |
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