JP2005200704A - Method for repairing molten steel tapping hole in converter - Google Patents

Method for repairing molten steel tapping hole in converter Download PDF

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JP2005200704A
JP2005200704A JP2004008238A JP2004008238A JP2005200704A JP 2005200704 A JP2005200704 A JP 2005200704A JP 2004008238 A JP2004008238 A JP 2004008238A JP 2004008238 A JP2004008238 A JP 2004008238A JP 2005200704 A JP2005200704 A JP 2005200704A
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converter
outlet
refractory
steel
sleeve brick
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JP4241401B2 (en
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Kimiharu Aida
公治 會田
Mitsushi Hirano
満志 平野
Minoru Furusato
稔 古里
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Jfe Steel Kk
Jfeスチール株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

<P>PROBLEM TO BE SOLVED: To perform the repairing of a molten steel tapping hole in a converter while reducing the load of a worker. <P>SOLUTION: The repairing of the molten steel tapping hole 10 is performed by fitting a new sleeve brick in the molten steel tapping hole in the eroded converter and filling up monolithic refractory 40 into a gap between the refractory in the molten steel tapping hole and the sleeve brick 12. Then, the monolithic refractory 40 is charged into the converter 1 through a scrap chute 31 for charging the scrap, and the monolithic refractory 40 is shifted in the converter 1 by turning the converter 1 and filled up into the gap 10a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、鉄鋼業で使用される転炉の出鋼口の補修方法に関する。   The present invention relates to a repair method for a steel outlet of a converter used in the steel industry.
転炉で鉄鋼業の操業を重ねると、転炉の出鋼口が溶損することから、その溶損した出鋼口を補修する必要がある。転炉の出鋼口の補修方法として、出鋼口の溶損部分に円筒状の孔を設け、その孔内に新たに取り付ける円筒状のスリーブレンガを挿入交換して行う補修方法がある(例えば特許文献1参照)。この方法では、円筒状の孔とスリーブレンガとの隙間に不定形耐火材を充填する必要があり、その作業は、転炉の投入口近くで、作業員が充填装置等を用いて当該転炉の投入口から円筒状の孔とスリーブレンガとの隙間に不定形耐火材を充填することで行われていた(例えば特許文献1に開示されている図5参照)。
特開平5−195038号公報
If the steel industry is repeatedly operated in the converter, the outlet of the converter will be damaged, and it is necessary to repair the damaged outlet. As a repairing method for the steel outlet of the converter, there is a repairing method in which a cylindrical hole is provided in the melted part of the steel outlet and a cylindrical sleeve brick newly attached in the hole is inserted and replaced (for example, Patent Document 1). In this method, it is necessary to fill the gap between the cylindrical hole and the sleeve brick with an irregular refractory material, and the work is performed near the converter inlet by an operator using a filling device or the like. This is performed by filling an irregular refractory material into a gap between the cylindrical hole and the sleeve brick from the charging port (see, for example, FIG. 5 disclosed in Patent Document 1).
Japanese Patent Laid-Open No. 5-195038
しかし、通常、未だ転炉内が高温になっている状態で出鋼口の補修を行うので、投入口から不定形耐火材を充填する際の作業員への負荷が大きくなる。
そこで、本発明は、前述の問題に鑑みてなされたものであり、作業者の負荷を軽減して、転炉の出鋼口を補修することができる転炉の出鋼口の補修方法の提供を目的とする。
However, since the steel outlet is usually repaired in a state where the converter is still at a high temperature, the load on the worker when filling the irregular refractory material from the inlet increases.
Then, this invention is made | formed in view of the above-mentioned problem, and provides the repair method of the steel outlet of a converter which can reduce a worker's load and can repair the steel outlet of a converter. With the goal.
請求項1記載の発明に係る転炉の出鋼口の補修方法は、溶損した転炉の出鋼口内に新たなスリーブレンガを取り付け、出鋼口内耐火物と前記スリーブレンガとの間の隙間に不定形耐火材を充填して、前記出鋼口の補修を行う転炉の出鋼口の補修方法において、前記不定形耐火材を前記転炉内に投入し、前記転炉を回動させることで、前記不定形耐火材を、前記転炉内で移動させ、前記隙間に充填することを特徴とする。   A repair method for a steel outlet of a converter according to the first aspect of the present invention is such that a new sleeve brick is attached in the steel outlet of a converter that has been melted, and a gap between the refractory in the steel outlet and the sleeve brick is attached. In a repairing method for a steel outlet of a converter that is filled with an irregular refractory material and repairs the steel outlet, the irregular refractory material is put into the converter and the converter is rotated. Thus, the irregular refractory material is moved in the converter and filled in the gap.
また、請求項2記載の発明に係る転炉の出鋼口の補修方法は、請求項1記載の発明に係る転炉の出鋼口の補修方法において、前記転炉が底部に溶鋼の製造に使用するガスを噴出すためのガス噴出口を有するものであり、前記ガス噴出口からガスを噴出させながら前記転炉を回動させることで、前記不定形耐火材を前記転炉内で移動させるとともに、前記転炉内のガス噴出口部分を通過させることを特徴とする。   Moreover, the repair method of the steel outlet of the converter which concerns on invention of Claim 2 is a repair method of the steel outlet of the converter which concerns on invention of Claim 1. A gas outlet for ejecting the gas to be used is provided, and the irregular refractory material is moved in the converter by rotating the converter while jetting gas from the gas outlet. At the same time, it is characterized in that the gas outlet portion in the converter is passed.
本発明によれば、転炉内に不定形耐火材を投入し、転炉を回動させることで、不定形耐火材を、転炉内で移動させ、溶損部分とスリーブレンガとの間の隙間に充填しているので、作業者が転炉の投入口に近づくことなく、転炉の出鋼口を補修することができる。これにより、作業者の負荷を軽減して、転炉の出鋼口を補修することができる。
なお、転炉内に不定形耐火材を投入するに際しては、転炉設備が一般的に備えている、例えば製鋼原料を転炉内に投入する投入装置を使用することができ、設備費も不要である利点がある。
また、不定形耐火材の前記隙間への充填を転炉の回動操作で行うことができるため、転炉が高温状態であっても迅速に補修を完了させることができる。
According to the present invention, the amorphous refractory material is charged into the converter, and the converter is rotated, so that the amorphous refractory material is moved in the converter, and the space between the melted portion and the sleeve brick is moved. Since the gap is filled, the operator can repair the steel outlet of the converter without approaching the inlet of the converter. Thereby, an operator's load can be reduced and the steel outlet of a converter can be repaired.
In addition, when introducing an irregular refractory material into the converter, it is possible to use, for example, an input device for introducing steelmaking raw materials into the converter, which is generally provided in the converter equipment, and no equipment costs are required. There is an advantage that is.
In addition, since filling the gap with the irregular refractory material can be performed by rotating the converter, the repair can be completed quickly even if the converter is in a high temperature state.
本発明を実施するための最良の形態を図面を参照しながら詳細に説明する。
図1乃至図4は、本発明に係る転炉の出鋼口を補修方法により、転炉1の出鋼口10を補修する様子を示す。
この図1乃至図4に示すように、転炉1は、鉄皮2内に耐火レンガ3が内張りされて炉体が形成されており、スクラップ等が投入される投入口4の近傍に出鋼口10が形成されている。出鋼口10は、転炉1の鉄皮2から突出した形で形成される出鋼口鉄皮11とその内張りの耐火物及びスリーブレンガ12で構成された構造になっている。また、転炉1には、底部に、溶鋼の製造に使用するガスである不活性或いは純酸素ガス等を噴出するガス噴出口5が設けてある。また、転炉1には、当該転炉1を回動させるためのトラニオン6が鉄皮2に取り付けられている。
The best mode for carrying out the present invention will be described in detail with reference to the drawings.
1 to 4 show a state in which the steel outlet 10 of the converter 1 is repaired by the repair method of the steel outlet of the converter according to the present invention.
As shown in FIGS. 1 to 4, the converter 1 has a furnace body formed by lining a refractory brick 3 in an iron shell 2, and a steel outlet is provided in the vicinity of an inlet 4 into which scrap or the like is charged. A mouth 10 is formed. The steel outlet 10 has a structure composed of a steel outlet 11 that protrudes from the iron shell 2 of the converter 1, a refractory material on the lining, and a sleeve brick 12. Further, the converter 1 is provided with a gas outlet 5 at the bottom for injecting an inert or pure oxygen gas, which is a gas used for producing molten steel. Further, a trunnion 6 for rotating the converter 1 is attached to the iron shell 2 in the converter 1.
このような転炉1において、操業を重ね出鋼を繰り返すと、スリーブレンガ12が溶損する。この溶損したスリーブレンガ12を含む出鋼口10を次のように補修する。
先ず、図1に示すように、出鋼を完了した転炉1をトラニオン6を軸に回動させて、出鋼口10を操業床21に近い位置に移動させる。そして、操業床21上のスリーブレンガ着脱装置22のジャイアントドリル(出鋼口10を形成するスリーブレンガ12の直径より大きな径のドリルの総称)23により、出鋼口鉄皮11内に取り付けられている古いスリーブレンガを削り取る。この図1は、スリーブレンガ着脱装置22のジャイアントドリル23により出鋼口鉄皮11内からスリーブレンガ12が取り除かれた様子を示す。
In such a converter 1, when the operation is repeated and steel is repeated, the sleeve brick 12 is melted. The steel outlet 10 including the melted sleeve brick 12 is repaired as follows.
First, as shown in FIG. 1, the converter 1 that has finished steel turning is rotated around the trunnion 6, and the steel outlet 10 is moved to a position close to the operation floor 21. And it attaches in the steel outlet 11 with a giant drill (generally a drill having a diameter larger than the diameter of the sleeve brick 12 forming the steel outlet 10) 23 of the sleeve brick attaching / detaching device 22 on the operation floor 21. Scrape old sleeve bricks. FIG. 1 shows a state in which the sleeve brick 12 is removed from the steel outlet iron skin 11 by the giant drill 23 of the sleeve brick attaching / detaching device 22.
なお、前述したように、スリーブレンガ12の直径より大きな径のドリル、いわゆるジャイアントドリル23を使用して、溶損したスリーブレンガ部分を開孔すれば、短時間でスリーブレンガを取り除くことができる。しかし、ブレーカ(破砕機)等を用いて除去するようにしてもかまわない。
溶損したスリーブレンガ部分(周囲を含む)の取り除きが完了した後は、引き続いて、図2に示すように、転炉1の回動位置を維持したまま、スリーブレンガ着脱装置22の取り付けロッド24の先端部分に円筒形状のスリーブレンガ12を装着し、スリーブレンガ12を出鋼口鉄皮11内に挿入して、出鋼口10を復元する。ここでは、スリーブレンガ12は、取り付けロッド24先端で支持されるフランジを有する鋼管13の外周に取り付けられている例で示す。
As described above, the sleeve brick can be removed in a short time by using a drill having a diameter larger than that of the sleeve brick 12, that is, the so-called giant drill 23, to open the melted sleeve brick portion. However, it may be removed using a breaker (crusher) or the like.
After the removal of the melted sleeve brick portion (including the surroundings) is completed, the mounting rod 24 of the sleeve brick attaching / detaching device 22 is continuously maintained while the rotating position of the converter 1 is maintained as shown in FIG. A cylindrical sleeve brick 12 is attached to the front end portion of the steel plate, and the sleeve brick 12 is inserted into the steel outlet 11 and the steel outlet 10 is restored. Here, the sleeve brick 12 is shown by the example attached to the outer periphery of the steel pipe 13 which has the flange supported by the attachment rod 24 front-end | tip.
そして、スリーブレンガ着脱装置22の取り付けロッド24先端部分に装着・支持した新しいスリーブレンガ12を出鋼口鉄皮11内に挿入し取り付ける。この取り付けは、フランジ13aと出鋼口鉄皮11のフランジ11aを結合して、フランジ13aを有する鋼管13側を出鋼口10内に固着させることにより行う。なお、この時点では、スリーブレンガ12の外周面と出鋼口鉄皮案11の内の耐火物周面の間には若干の隙間10aが存在する。このようなことから、続いて、その隙間10aに不定形耐火材を充填する作業を行う。   Then, the new sleeve brick 12 mounted and supported on the tip of the mounting rod 24 of the sleeve brick attaching / detaching device 22 is inserted into the steel outlet 11 and attached. This attachment is performed by joining the flange 13a and the flange 11a of the steel outlet 11 and fixing the steel pipe 13 side having the flange 13a in the steel outlet 10. At this point, there is a slight gap 10 a between the outer peripheral surface of the sleeve brick 12 and the peripheral surface of the refractory in the steel outlet iron plan 11. For this reason, subsequently, an operation of filling the gap 10a with the irregular refractory material is performed.
本発明において、前記隙間10aに不定形耐火材を充填する作業では、先ず、図3に示すように、転炉1をトラニオン6を軸に回動させて、スクラップシュート31によりスクラップ等を投入可能な位置に投入口4を移動させる。ここで、スクラップシュート31は、転炉1に製鋼原料等のスクラップを投入するために一般的に備えられている投入装置である。
ここで、このスクラップシュート31に不定形耐火材40を収容し、このスクラップシュート31により、前記隙間10aの充填用の不定形耐火材40を転炉1内に投入する。不定形耐火材40は、これまででも、出鋼口を補修方法にもちいられていたものを用いる。下記表には、不定形耐火材40の物性値の一例を示す。
In the present invention, in the work of filling the gap 10a with the irregular refractory material, first, as shown in FIG. 3, the converter 1 can be rotated about the trunnion 6 and scrap or the like can be charged by the scrap chute 31. The inlet 4 is moved to a proper position. Here, the scrap chute 31 is a charging device that is generally provided for charging scrap such as a steelmaking raw material into the converter 1.
Here, the irregular refractory material 40 is accommodated in the scrap chute 31, and the irregular refractory material 40 for filling the gap 10 a is put into the converter 1 by the scrap chute 31. As the irregular refractory material 40, a material that has been used for repairing the steel outlet is used. The table below shows an example of physical property values of the irregular refractory material 40.
このように、最大粒径が6mmで、0.3mm未満の粒径が25%である不定形耐火材40を用いることができ、流動性が良好な不定形耐火材40を用いることができる。
続いて、本発明例の転炉1は、上底吹きあるいは底吹き転炉で示しているため転炉1の底部にガス噴出口5を有しているため、図4に示すように、転炉1の底部に設けてあるガス噴出口5からガスを噴出させながら、同図で時計方向(矢示A方向)に転炉1をトラニオン6を軸に回動させる。そして、最終的には、出鋼口10を下側に位置させる。このとき、これにより、不定形耐火材40が転炉1内を図4中の矢示B方向に流動して、出鋼口鉄皮11内の耐火物とスリーブレンガ12との間の隙間10aに流れ込む。また、ガス噴出口5からガスを噴出させながら不定形耐火材40を転炉1内を流動させているので、ガス噴出口5内に不定形耐火材40が流入することなく、当該ガス噴出口5上を不定形耐火材40が通過するようになる。
Thus, the amorphous refractory material 40 having a maximum particle size of 6 mm and a particle size of less than 0.3 mm of 25% can be used, and the amorphous refractory material 40 having good fluidity can be used.
Subsequently, since the converter 1 of the present invention example is shown by top-bottom blowing or bottom-blowing converter, it has a gas outlet 5 at the bottom of the converter 1, and as shown in FIG. While the gas is ejected from the gas outlet 5 provided at the bottom of the furnace 1, the converter 1 is rotated in the clockwise direction (arrow A direction) in the same figure around the trunnion 6. Finally, the steel outlet 10 is positioned on the lower side. At this time, this causes the irregular refractory material 40 to flow in the converter 1 in the direction indicated by the arrow B in FIG. 4, and the gap 10 a between the refractory in the steel outlet 11 and the sleeve brick 12. Flow into. Further, since the irregular refractory material 40 is caused to flow in the converter 1 while gas is ejected from the gas ejection port 5, the irregular refractory material 40 does not flow into the gas ejection port 5. The unshaped refractory material 40 passes over 5.
そして、出鋼口鉄皮11内の耐火物とスリーブレンガ12との間の隙間10aに流れ込んだ不定形耐火材40は、一定時間経過すると、乾燥・焼成が完了する。そして、ここで、転炉内1が高温であることから、その乾燥・焼成も短時間で完了する。
以上のようにスリーブレンガ12を交換し、出鋼口鉄皮11内の耐火物とスリーブレンガ12との間の隙間10aに不定形耐火材40を充填して、転炉1の出鋼口10を補修する。
The amorphous refractory material 40 that has flowed into the gap 10a between the refractory in the steel outlet 11 and the sleeve brick 12 is completely dried and fired after a certain period of time. And since the converter inside 1 is high temperature here, the drying and baking are also completed in a short time.
As described above, the sleeve brick 12 is replaced, the gap 10a between the refractory in the steel outlet 11 and the sleeve brick 12 is filled with the irregular refractory material 40, and the steel outlet 10 of the converter 1 is filled. Repair.
なお、転炉1内に不定形耐火材40を投入するものとして、スクラップシュート31を示しているが、転炉1が備える製鋼副原料投入設備を用いて行ってもよい。
また、別途、転炉1内に不定形耐火材を投入できる機器を用いてもよい。なお、転炉1が上吹き転炉であれば、底部ガス噴出口を有さないため、転炉の回動操作のみで実施でき、より簡単である。
また、補修後の出鋼口10内にはスリーブレンガ12内面に鋼管13が存在する形となるが、該鋼管13は出鋼時溶鋼との接触で溶融消去され、何ら問題は生じない。
In addition, although the scrap chute | shoot 31 is shown as what throws the indeterminate form refractory material 40 in the converter 1, you may carry out using the steelmaking auxiliary material input equipment with which the converter 1 is provided.
Moreover, you may use the apparatus which can throw in an amorphous refractory material in the converter 1 separately. If the converter 1 is a top blow converter, it does not have a bottom gas outlet, so that it can be implemented only by a rotating operation of the converter and is simpler.
Further, although the steel pipe 13 is present on the inner surface of the sleeve brick 12 in the steel outlet 10 after repair, the steel pipe 13 is melted and erased by contact with the molten steel at the time of steel output, and no problem occurs.
次に効果を説明する。
前述したように、本発明においては、転炉1内に一旦不定形耐火材40を投入し、この不定形耐火材40を転炉1の回動操作により隙間10aに達しめる。これにより、出鋼を完了した後であるが未だ転炉内が高温である状態であっても、作業者が転炉の投入口に近づくことなく、不定形耐火材40を出鋼口鉄皮11内の耐火物とスリーブレンガ12との間の隙間10aに充填することができるので、作業員の負担は軽減される。これにより、転炉1の出鋼口10の補修作業時間も短縮できる。
Next, the effect will be described.
As described above, in the present invention, the irregular refractory material 40 is once put into the converter 1, and the irregular refractory material 40 is made to reach the gap 10 a by the turning operation of the converter 1. Thereby, even after the completion of the steel output, even if the inside of the converter is still in a high temperature state, the worker can move the amorphous refractory material 40 to the steel outlet iron skin without approaching the inlet of the converter. Since the gap 10a between the refractory 11 and the sleeve brick 12 can be filled, the burden on the worker is reduced. Thereby, the repair work time of the steel outlet 10 of the converter 1 can also be shortened.
本発明の実施形態であり、出鋼口内に取り付けられている古いスリーブレンガを取り除く工程を示す図である。It is embodiment of this invention and is a figure which shows the process of removing the old sleeve brick attached in the steel outlet. 本発明の実施形態であり、出鋼口内に新しいスリーブレンガを取り付ける工程を示す図である。It is an embodiment of the present invention and is a diagram showing a process of attaching a new sleeve brick in the steel outlet. 本発明の実施形態であり、スクラップシュートにより不定形耐火材を転炉内に投入する工程を示す図である。It is an embodiment of the present invention, and is a diagram showing a process of introducing an irregular refractory material into a converter by a scrap chute. 本発明の実施形態であり、出鋼口鉄皮内の耐火物とスリーブレンガとの間の隙間に不定形耐火材を充填する工程を示す図である。It is embodiment of this invention and is a figure which shows the process of filling an irregular-shaped refractory material in the clearance gap between the refractory material in a steel outlet iron shell, and a sleeve brick.
符号の説明Explanation of symbols
1 転炉
2 鉄皮
3 耐火レンガ
4 投入口
5 ガス噴出口
6 トラニオン
10 出鋼口
10a 隙間
11 出鋼口鉄皮
12 スリーブレンガ
22 スリーブレンガ着脱装置
23 ジャンボドリル
24 取り付けロッド
31 スクラップシュート
40 不定形耐火材
DESCRIPTION OF SYMBOLS 1 Converter 2 Iron skin 3 Refractory brick 4 Input port 5 Gas outlet 6 Trunnion 10 Steel outlet 10a Clearance 11 Steel outlet iron skin 12 Sleeve brick 22 Sleeve brick attaching / detaching device 23 Jumbo drill 24 Mounting rod 31 Scrap chute 40 Indeterminate form Refractory material

Claims (2)

  1. 溶損した転炉の出鋼口内に新たなスリーブレンガを取り付け、出鋼口内耐火物と前記スリーブレンガとの間の隙間に不定形耐火材を充填して、前記出鋼口の補修を行う転炉の出鋼口の補修方法において、
    前記不定形耐火材を前記転炉内に投入し、前記転炉を回動させることで、前記不定形耐火材を、前記転炉内で移動させ、前記隙間に充填することを特徴とする転炉の出鋼口の補修方法。
    A new sleeve brick is attached to the outlet of the molten steel converter, and the gap between the outlet refractory and the sleeve brick is filled with an irregular refractory material to repair the outlet. In repairing the furnace outlet,
    The amorphous refractory material is charged into the converter, and the converter is rotated to move the amorphous refractory material within the converter and fill the gap. How to repair the steel outlet of the furnace.
  2. 前記転炉は底部に溶鋼の製造に使用するガスを噴出すためのガス噴出口を有するものであり、
    前記ガス噴出口からガスを噴出させながら前記転炉を回動させることで、前記不定形耐火材を前記転炉内で移動させるとともに、前記転炉内のガス噴出口部分を通過させることを特徴とする請求項1記載の転炉の出鋼口の補修方法。
    The converter has a gas outlet for ejecting gas used for manufacturing molten steel at the bottom,
    The irregular refractory is moved in the converter by rotating the converter while jetting gas from the gas outlet, and the gas outlet portion in the converter is allowed to pass through. A repairing method for a steel outlet of a converter according to claim 1.
JP2004008238A 2004-01-15 2004-01-15 Repair method for steel outlet of converter Active JP4241401B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102311074A (en) * 2010-06-30 2012-01-11 鞍钢集团工程技术有限公司 Converter afterheat boiler maintenance equipment and boiler maintenance method
JP2012162784A (en) * 2011-02-09 2012-08-30 Jfe Steel Corp Method of constructing block brick to steel tapping hole of converter

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Publication number Priority date Publication date Assignee Title
KR101246200B1 (en) 2011-02-24 2013-03-21 현대제철 주식회사 Screen device of agitating gas nozzle for medium blowing at electric furnace
CN102719592A (en) * 2011-03-30 2012-10-10 鞍钢股份有限公司 Method for bricklaying furnace lining of large converter
CN110331252B (en) * 2019-08-23 2021-04-30 广东韶钢松山股份有限公司 Method for repairing partially damaged brick cup of tap hole of converter on line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102311074A (en) * 2010-06-30 2012-01-11 鞍钢集团工程技术有限公司 Converter afterheat boiler maintenance equipment and boiler maintenance method
JP2012162784A (en) * 2011-02-09 2012-08-30 Jfe Steel Corp Method of constructing block brick to steel tapping hole of converter

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