JPH049416A - Method for repairing crack of blast furnace shell - Google Patents
Method for repairing crack of blast furnace shellInfo
- Publication number
- JPH049416A JPH049416A JP11024890A JP11024890A JPH049416A JP H049416 A JPH049416 A JP H049416A JP 11024890 A JP11024890 A JP 11024890A JP 11024890 A JP11024890 A JP 11024890A JP H049416 A JPH049416 A JP H049416A
- Authority
- JP
- Japan
- Prior art keywords
- shell
- repair
- water
- blast furnace
- cooling
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 230000008439 repair process Effects 0.000 claims abstract description 26
- 239000000498 cooling water Substances 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 239000000945 filler Substances 0.000 claims description 4
- 239000008400 supply water Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 238000012856 packing Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004868 gas analysis Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 241000972773 Aulopiformes Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 235000019515 salmon Nutrition 0.000 description 1
Landscapes
- Blast Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、高炉炉体の鉄皮亀裂補修方法に関するもので
、とくに、炉体鉄皮が亀裂を起ごした場合、鉄皮亀裂補
修を完全にかつ容易に行い、炉体の寿命を延長させるこ
とができる高炉鉄皮の補修方法に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for repairing cracks in the shell of a blast furnace body, and in particular, when a crack occurs in the shell of a blast furnace, the method for repairing cracks in the shell is The present invention relates to a method for repairing a blast furnace shell that can be carried out completely and easily and that can extend the life of the furnace body.
〈従来の技術〉
一般に、高炉の如く、炉内が高温にさらされるものは、
火入れ後時間がたつとともに、炉内の内張り耐火レンガ
、冷却面、ステーブ等の炉体冷却装置が破損したり、脱
落したりし、それに伴って、高炉鉄皮の変形や亀裂が発
生する。特に火入れ後、例えば７年以上経過すると、炉
内の耐火レンガの大部分は侵食され、前記冷却装置にも
破損、脱落が生して炉壁保護体がなくなると、当該部分
の熱負荷が過大となり、高炉鉄皮にはホントスボアＬや
変形が発生し亀裂にまで発展する。このように鉄皮亀裂
が起こると、炉内ガスは炉外に吹き出し、高炉操業を休
止せざるを得なくなる。<Conventional technology> Generally, in a furnace such as a blast furnace, where the inside of the furnace is exposed to high temperatures,
As time passes after firing, the furnace body cooling devices such as the refractory brick lining, cooling surface, and stave inside the furnace are damaged or fall off, and as a result, deformation and cracks occur in the blast furnace shell. In particular, if seven years or more have passed after firing, most of the refractory bricks inside the furnace will erode, and the cooling device will also break or fall off, causing the furnace wall protector to disappear, resulting in an excessive heat load on that part. As a result, true bore L and deformation occur in the blast furnace skin, which develops into cracks. When cracks occur in the steel shell, the gas inside the furnace blows out of the furnace, forcing the blast furnace to suspend operation.
従来、高炉鉄皮の亀裂補修は、鉄皮亀裂両端にストップ
ホールを穿ち、亀裂部をガウジングした後、肉盛溶接し
たりあるいは亀裂部に補修用鋼板や半割バイブを溶接し
た上、これら補修部にリブを取付けて鉄皮を補強したり
して補修していた。Traditionally, cracks in blast furnace shells have been repaired by drilling stop holes at both ends of the shell, gouging the cracks, then overlay welding, or by welding a repair steel plate or half-split vibrator to the cracks, and then repairing these. Repairs were made by attaching ribs to the parts and reinforcing the iron skin.
しかるにこれらの補修は数週間経たない内に再び亀裂が
生しるので再補修を繰り返しているのが実状であった。However, the reality is that cracks appear again within a few weeks of these repairs, so re-repairs have to be repeated.
前記従来技術の高炉鉄皮の補修方法を改善すべく特公昭
５７−１４７２７号公報には、高炉鉄皮の亀裂部分を溶
接してから、その鉄皮補修部上に、内部に冷却装置を有
する箱体を取付け、その後、この箱体の内部に、耐火物
を注入して、前記冷却装置と高炉鉄皮との間に耐火物層
を形成するものが提案されている。In order to improve the conventional blast furnace shell repair method, Japanese Patent Publication No. 57-14727 discloses a method in which a cracked part of the blast furnace shell is welded and then a cooling device is provided inside the repaired part of the blast furnace shell. It has been proposed to attach a box and then inject a refractory into the box to form a refractory layer between the cooling device and the blast furnace shell.
〈発明が解決しようとする課題〉
前記公報に提案されている従来技術によってそれなりの
効果を上げているが、亀裂部を溶接した補修部鉄皮の上
面に耐火層を形成し、その上部より冷却装置で冷却を図
っているため、補修部鉄皮への冷却効率が悪い、このた
め亀裂が生じ易く、亀裂部が多くなると強度低下を招く
ので、補修部鉄皮の上面に設ける箱体に高炉鉄皮に代わ
る強度を保有させる必要があり、補修費が高くなるとい
う問題点があった。<Problems to be Solved by the Invention> The conventional technology proposed in the above publication has achieved a certain degree of effectiveness, but a fireproof layer is formed on the upper surface of the repaired steel skin where the cracked part is welded, and cooling is carried out from above. Because the equipment is used to cool the repaired steel shell, the cooling efficiency of the repaired steel shell is poor.This makes it easy for cracks to occur, and the more cracks there are, the lower the strength. There was a problem in that it needed to have strength that could replace iron skin, which increased repair costs.
本発明は前述従来技術の問題点を解決し、冷却効率の良
い高炉鉄皮の補修方法を提案することを目的とするもの
である。It is an object of the present invention to solve the problems of the prior art described above and to propose a method for repairing blast furnace shells with good cooling efficiency.
く課題を解決するための手段〉
前記目的を達成するための本発明は、高炉鉄皮の亀裂部
へ充填材を充填して密封した後、咳鉄皮密封部の上に補
修用ｆＡＦｉを溶接して鉄皮亀裂部を補修し、該鉄皮補
筆部上を覆うベロー型水冷ジャケット金物を取り付ける
と共に、該ベロー型水冷シャケ７）金物に給水管および
排水管を接続し、前記給水管から給水してベロー型水冷
シャケ・７ト金物内の冷却水圧力を高炉炉内のガス圧力
と同等もしくはわずかに高い圧力に維持しつつ鉄皮補修
部を冷却し、前記排水管から排水するように構成したこ
とを特徴とする高炉鉄皮の亀裂補修方法である。Means for Solving the Problems> The present invention to achieve the above object includes filling and sealing the cracks of the blast furnace shell with a filler, and then welding fAFi for repair onto the sealed portion of the blast furnace shell. Repair the cracks in the steel shell, install a bellows-type water-cooled jacket hardware that covers the repaired part of the steel shell, and connect a water supply pipe and a drain pipe to the bellows-type water-cooling jacket 7), and supply water from the water supply pipe. The cooling water pressure in the bellows-type water-cooled salmon/7-piece hardware is maintained at a pressure equal to or slightly higher than the gas pressure in the blast furnace, while cooling the steel shell repaired part, and draining water from the drain pipe. This is a method for repairing cracks in blast furnace shell, which is characterized by:
〈作 用〉
鉄皮亀裂部に充填する充填材としては熱伝導率が鉄皮と
同等のものが好ましいので、例えば鉄パテを充填してシ
ールし、当該鉄皮表面に補修用鋼板を溶接してまず比較
的簡単な作業で復旧する。<Function> It is preferable to use a material with thermal conductivity equivalent to that of the steel skin as a filler to fill cracks in the steel skin, so for example, iron putty can be filled and sealed, and a repair steel plate can be welded to the surface of the steel skin. First, it is a relatively easy task to recover.
さらに鉄皮補修部を包含する鉄皮上を覆うようにベロー
型水冷ジャケットを取り付けて密封構造にし鉄皮補修部
を直接冷却水により冷却する。補修用鋼板の厚みは冷却
効果を高めるため５〜Ｉｏｎが適当である。かくして、
鉄皮１内の炉壁保護体が薄くなったり存在しなくなった
鉄皮補修部の高熱負荷に適応した補修を行うことができ
る。Furthermore, a bellows-type water cooling jacket is attached to cover the steel shell including the repaired steel section to create a sealed structure, and the repaired section of the steel shell is directly cooled by cooling water. The appropriate thickness of the repair steel plate is 5 to 1 ion to enhance the cooling effect. Thus,
It is possible to carry out repairs that are suitable for high heat loads in repaired parts of the steel shell where the furnace wall protector within the shell 1 has become thin or no longer exists.
通常、高炉の炉内ガス圧は２，７〜３．２ ｋｇ／ｃｄ
であるので、ベロー型水冷ジャケット金物内の冷却水圧
力を前記炉内圧と同等にするか、わずかに高い圧力すな
わち前記炉内圧に０ 、１ ｋｇ ／ ｃｊ程度加えた
圧力とする０本発明の方法によって補修した後、鉄皮補
修部に再亀裂が生した場合亀裂部から冷却水が浸水する
ことになるが、ベロー型水冷ジャケット金物内の水圧が
炉内圧と同等もしくはわずかに高い圧力にとどめである
ので、炉内への激しい浸水を生しることがない。Normally, the gas pressure inside the blast furnace is 2.7 to 3.2 kg/cd.
Therefore, the method of the present invention makes the cooling water pressure in the bellows-type water-cooled jacket hardware equal to the furnace pressure, or slightly higher, that is, about 0.1 kg/cj added to the furnace pressure. If cracks occur in the repaired steel skin again after repair using the above method, cooling water will seep in through the cracks, but if the water pressure inside the bellows-type water cooling jacket hardware is kept at the same level or slightly higher than the furnace internal pressure. This prevents severe water from entering the furnace.
〈実施例〉
以下、本発明の一実施例を図面に基づいて説明する。第
１図において、１は高炉鉄皮であり、高炉鉄皮１内の耐
火レンガ３が脱落し、ステーブ２が破…して鉄皮１の熱
負荷が過大になり、鉄皮１に亀裂部４が生じたら補修す
ることになるが、本発明ではまず鉄皮１の亀裂部４へ充
填材６を充填して密封した後、鉄皮密封部の上に補修用
鋼板５を溶接して鉄皮亀裂部４を補修する。次に補修用
ａＦｉ、５を溶接した鉄皮補修部上を包含して覆うよう
にベロー型水冷ジャケット金物７を溶接により取付けて
密封構造にすると共に、ベロー型水冷ジャケット７に給
水管８および排水管９を接続する。<Example> An example of the present invention will be described below based on the drawings. In Fig. 1, reference numeral 1 indicates the blast furnace shell, and the refractory bricks 3 in the blast furnace shell 1 fall off, the stave 2 breaks, and the heat load on the shell 1 becomes excessive, causing cracks in the shell 1. 4 should be repaired, but in the present invention, first, filler 6 is filled into the crack 4 of the steel skin 1 to seal it, and then a repair steel plate 5 is welded on top of the sealed part of the steel skin 1. Repair the skin crack 4. Next, a bellows-type water-cooling jacket hardware 7 is attached by welding to cover and cover the repaired part of the steel skin where the repair aFi, 5 is welded, to create a sealed structure, and a water supply pipe 8 and drainage pipe are attached to the bellows-type water-cooling jacket 7 Connect tube 9.
前記のようにして高炉の鉄皮亀裂部４の補修が終了した
ら給水管８から冷却水を供給してベロー型水冷ジャケッ
ト金物７内の冷却水圧力を高炉炉内のガス圧力と同等、
もしくはわずかに高い圧力に維持しつつ鉄皮補修部を冷
却した後、排水管９から排水して排水樋ＩＯに導かれる
。このようにして鉄皮１の亀裂補修部を鉄皮表面から直
接冷却水によって水封状態で冷却し、高熱負荷を伴う鉄
皮ｌの再亀裂を防止するものであるが、当該冷却によっ
て鉄皮１内の炉内製人物が冷却されて付着耐火層が形成
され、これが鉄皮ｌの保護体となる。When the cracks 4 in the blast furnace shell are repaired as described above, cooling water is supplied from the water supply pipe 8 to make the cooling water pressure in the bellows-type water-cooling jacket hardware 7 equal to the gas pressure in the blast furnace.
Alternatively, after cooling the repaired steel part while maintaining a slightly higher pressure, water is drained from the drain pipe 9 and led to the drain gutter IO. In this way, the crack repaired part of the steel shell 1 is cooled in a water-sealed state with cooling water directly from the surface of the steel shell, thereby preventing re-cracking of the steel shell 1 which is accompanied by a high heat load. The in-furnace material in the furnace 1 is cooled to form an adhering refractory layer, which serves as a protector for the iron shell 1.
なお、鉄皮１の補修部を直接水封状態で冷却するため、
当該部分が再亀裂を生した場合、ベロー型水冷ジャケッ
ト金物７内の冷却水が再亀裂部から炉内に浸水すること
になるが、本発明では冷却水の水圧を炉内ガス圧と同等
もしくは若干高くとどめることにより、再亀裂部から炉
内に大量に浸水することがなく、浸水による事故防止を
図ることができる。In addition, in order to directly cool the repaired part of the steel shell 1 in a water-sealed state,
If this part re-cracks, the cooling water in the bellows-type water cooling jacket hardware 7 will flood into the furnace from the re-cracked part, but in the present invention, the water pressure of the cooling water is equal to or equal to the gas pressure in the furnace. By keeping the height a little high, a large amount of water will not enter the furnace from the re-cracked part, and accidents due to water intrusion can be prevented.
本発明の実施例においてはベロー型水冷ジャケソｊ・金
物７内に給水される冷却水は圧力調整弁ＩＩにて圧力調
整されるが、このとき、圧力調整弁１１は炉内圧を測定
する圧力計１２の圧力信号を基準にして圧力制御器１３
によって制御され、ベロー型水冷ジャケット金物７内の
冷却水圧力を炉内ガス圧と同等もしくはわずかに高い圧
力に維持される。In the embodiment of the present invention, the pressure of the cooling water supplied into the bellows-type water-cooled jacket socket j/metal 7 is regulated by the pressure regulating valve II, but at this time, the pressure regulating valve 11 is a pressure gauge that measures the pressure inside the furnace. Pressure controller 13 based on the pressure signal of 12
The pressure of the cooling water in the bellows-type water-cooled jacket metal fitting 7 is maintained at a pressure equal to or slightly higher than the gas pressure in the furnace.
補修部近傍の鉄皮１に再亀裂が発生した場合には、炉内
の高熱部に直接浸水するからベロー型水冷金物７内の圧
力上昇を来すが、排水管９の排水端が開放されているた
め、ベロー型水冷金物７内は異常な高圧になることなく
正常値に保たれ冷却水は排出ｔｉ！１０へ排水されるの
で浸水が炉内に達するのは防止される。If a re-crack occurs in the steel skin 1 near the repaired part, water will directly flood into the high-temperature parts of the furnace, causing a pressure rise inside the bellows-type water-cooled hardware 7, but the drain end of the drain pipe 9 will be opened. As a result, the inside of the bellows-type water-cooled hardware 7 is maintained at a normal pressure without becoming abnormally high, and the cooling water is discharged. Since the water is drained to 10, water is prevented from reaching the inside of the furnace.
なお、前記の実施例では圧力計１２および圧力制御器１
３を使用して制御するものについて説明したが、高炉の
操業圧は、各高炉ごとに一定圧で操業しているので、圧
力調整弁１１を高炉の操業圧に設定してベロー型水冷ジ
ャケット金物７に冷却水を供給しても同様の効果を得る
ことができる。In addition, in the above embodiment, the pressure gauge 12 and the pressure controller 1
As described above, the operating pressure of each blast furnace is set to a constant pressure, so the pressure regulating valve 11 is set to the operating pressure of the blast furnace and the bellows type water-cooled jacket metal fittings are used. A similar effect can be obtained by supplying cooling water to 7.
ここで通常高炉の操業圧は２．７〜３．２ ｋｇ／ｃｄ
であり、この圧力と同等にするか、Ｏ，’１ｋｇ／ｃ４
程度を加えた圧力としてベロー型水冷ジャケット金物７
に供給すればよい、この冷却水の給水圧を高めにすると
、鉄皮再亀裂時に炉内への浸水が多くなり高炉操業に支
障を来す危険が大きいので前述の給水圧にするのが好ま
しい。Here, the operating pressure of a normal blast furnace is 2.7 to 3.2 kg/cd.
, and make it equal to this pressure, or O,'1kg/c4
Bellows type water cooling jacket hardware 7 as a pressure added to the degree
If the water supply pressure of this cooling water is set to a high level, there is a high risk that water will enter the furnace when the shell re-cracks, causing problems with blast furnace operation, so it is preferable to set the water supply pressure as described above. .
なお、炉内の浸水を判定する手段としては、炉頂ガス分
析針によるガス中のＨ２濃度の変化によって検出可能で
ある。炉頂ガス分析針により検出される炉頂ガス中のＨ
１濃度の上昇によって、鉄皮再亀裂による炉内への浸水
を検出し、これに基づいてベロー型水冷ジャケット７へ
供給する冷却水の圧力を低下させれば浸水を防止するこ
とができる。Note that water intrusion inside the furnace can be determined by detecting a change in the H2 concentration in the gas using a furnace top gas analysis needle. H in the furnace top gas detected by the furnace top gas analysis needle
Water intrusion into the furnace due to re-cracking of the steel shell is detected by the increase in the 1 concentration, and water intrusion can be prevented by lowering the pressure of the cooling water supplied to the bellows-type water cooling jacket 7 based on this detection.
ところで高炉操業においては加湿送風、または羽口部で
の水分添加による送風により高炉ボッシュ部での水素濃
度を上げ、水素による鉱石の還元反応に使用している。By the way, in blast furnace operation, the hydrogen concentration in the blast furnace bosch section is increased by humidifying air blowing or air blowing by adding water at the tuyere section, and the hydrogen concentration is used for the reduction reaction of ore with hydrogen.
したがって通常の制御範囲内の水素濃度までであれば鉄
皮再亀裂による炉内への浸水は許容される。このときの
浸水による■。Therefore, as long as the hydrogen concentration is within the normal control range, water intrusion into the furnace due to re-cracking of the shell is allowed. ■ Due to flooding at this time.
濃度上昇は炉頂ガス分析針で判定することができる。Concentration increases can be determined using a top gas analysis needle.
鉄皮の亀裂部に鉄パテを充填し、その上面を厚さ６閣の
鋼板で当てて溶接により補修し、当該補修部を内在する
ようにベロー型水冷ジャケット金物で覆い、炉内圧３．
１ｋｇ／ｃｊに対応して冷却水を３．２ｋｇ／ｃ−の給
水圧で水封されるように給水して冷却したところ、６ケ
月経過しても高炉鉄皮に再亀裂が発生することなく操業
を継続することができた。The cracks in the steel shell are filled with iron putty, the top surface of which is covered with a 6-mm thick steel plate, and repaired by welding.The repaired area is covered with a bellows-type water-cooled jacket metal fitting to reduce the furnace internal pressure to 3.
When cooling water was supplied and cooled at a pressure of 3.2 kg/c- corresponding to 1 kg/cj, no re-crack occurred in the blast furnace shell even after 6 months had passed. We were able to continue operations.
〈発明の効果〉
以上説明したように本発明によれば、高炉鉄皮の亀裂部
を比較的簡単な補修作業により容易に復旧できると共に
、鉄皮補修部を直接冷却水により冷却するので冷却効率
がよく、鉄皮の再亀裂発生を従来に比較して大幅に低減
することができ、高炉炉体の寿命延長が達成される。<Effects of the Invention> As explained above, according to the present invention, cracks in the blast furnace shell can be easily repaired by relatively simple repair work, and cooling efficiency is improved because the repaired part of the shell is directly cooled with cooling water. As a result, the occurrence of re-crack in the steel shell can be significantly reduced compared to the conventional method, and the life of the blast furnace body can be extended.
第１図は本発明の方法によって補修した場合の炉体の縦
断面図である。
１・・・鉄 皮、 ２・・・ステーブ、３
・・・耐火レンガ、 ４・・・亀裂部、５・・
・補修用鋼板、 ６・・・充填材、７・・・ベ
ロー型水冷ジャケット金物、８・・・給水管、
９・・・排水管、１０・・・排水樋、
ＩＪ・・・圧力調整弁、Ｉ２・・・圧力計、
１３・・・圧力制御器。
特許出願人 川崎製鉄株式会社FIG. 1 is a longitudinal sectional view of a furnace body repaired by the method of the present invention. 1... Iron skin, 2... Stave, 3
... Firebrick, 4... Crack, 5...
・Steel plate for repair, 6... Filling material, 7... Bellows type water cooling jacket hardware, 8... Water supply pipe,
9... Drain pipe, 10... Drain gutter,
IJ...Pressure regulating valve, I2...Pressure gauge,
13...Pressure controller. Patent applicant: Kawasaki Steel Corporation
Claims (1)
皮密封部の上に補修用鋼板を溶接して鉄皮亀裂部を補修
し、該鉄皮補修部上を覆うベロー型水冷ジャケット金物
を取り付けると共に、該ベロー型水冷ジャケット金物に
給水管および排水管を接続し、前記給水管から給水して
ベロー型水冷ジャケット金物内の冷却水圧力を高炉炉内
のガス圧力と同等もしくはわずかに高い圧力に維持しつ
つ鉄皮補修部を冷却し、前記排水管から排水するように
構成したことを特徴とする高炉鉄皮の亀裂補修方法。After filling the cracks in the blast furnace shell with a filler and sealing them, a repair steel plate is welded onto the sealed part of the shell to repair the cracks, and a bellows type is used to cover the repaired part of the shell. Attach the water cooling jacket hardware, connect a water supply pipe and a drain pipe to the bellows type water cooling jacket hardware, and supply water from the water supply pipe to make the cooling water pressure in the bellows type water cooling jacket hardware equal to or equal to the gas pressure in the blast furnace. A method for repairing cracks in a blast furnace shell, characterized in that the repaired part of the shell is cooled while maintaining a slightly high pressure, and water is drained from the drain pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11024890A JP2859691B2 (en) | 1990-04-27 | 1990-04-27 | How to repair cracks in blast furnace steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11024890A JP2859691B2 (en) | 1990-04-27 | 1990-04-27 | How to repair cracks in blast furnace steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH049416A true JPH049416A (en) | 1992-01-14 |
| JP2859691B2 JP2859691B2 (en) | 1999-02-17 |
Family
ID=14530872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11024890A Expired - Fee Related JP2859691B2 (en) | 1990-04-27 | 1990-04-27 | How to repair cracks in blast furnace steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2859691B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101350466B1 (en) * | 2012-09-10 | 2014-01-14 | 주식회사 포스코 | Apparatus for preventing crack of blast furnace steel |
-
1990
- 1990-04-27 JP JP11024890A patent/JP2859691B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101350466B1 (en) * | 2012-09-10 | 2014-01-14 | 주식회사 포스코 | Apparatus for preventing crack of blast furnace steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2859691B2 (en) | 1999-02-17 |
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