JP2750200B2 - Repair method for melted holes in converter - Google Patents
Repair method for melted holes in converterInfo
- Publication number
- JP2750200B2 JP2750200B2 JP9728490A JP9728490A JP2750200B2 JP 2750200 B2 JP2750200 B2 JP 2750200B2 JP 9728490 A JP9728490 A JP 9728490A JP 9728490 A JP9728490 A JP 9728490A JP 2750200 B2 JP2750200 B2 JP 2750200B2
- Authority
- JP
- Japan
- Prior art keywords
- hole
- converter
- doubling
- erosion
- erosion hole
- 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.)
- Expired - Lifetime
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本考案は、特に転炉の出鋼口の基端付近に生じる溶損
孔を効果的に補修し得るようにした転炉の溶損孔の補修
方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blast hole of a converter which can effectively repair a erosion hole particularly generated near a base end of a tap hole of a converter. Repair method.
周知のように、製鉄所や製鋼工場等では転炉の普及率
の向上が目ざましい。それは、転炉は平炉や電気炉等に
比較して、極めて廉価で鋼製品を製造し得ることに起因
している。As is well known, the penetration rate of converters has been remarkably improved in steel mills and steel mills. This is because the converter can manufacture steel products at a very low price as compared with open hearth furnaces, electric furnaces, and the like.
転炉の出鋼口の基端付近の構成は、その断面構成説明
図の第３図に示すように、鉄皮（１）の周部に設けられ
た貫通孔（1a）に円筒状の出鋼口金物（２）が嵌合され
て溶接されている。The configuration near the base end of the tap hole of the converter is, as shown in FIG. 3 in a sectional configuration explanatory view, a cylindrical outlet formed in a through hole (1a) provided in the periphery of the steel shell (1). A steel base (2) is fitted and welded.
また、出鋼口金物（２）に外嵌され、かつ鉄皮（１）
の外周面に沿ってダブリング（６）が溶接されている。In addition, the steel shell (1) is externally fitted to the tapping metal fitting (2).
A doubling (6) is welded along the outer peripheral surface of the slab.
さらに、鉄皮（１）の内側に内張耐火物（５）が張ら
れると共に、出鋼口金物（２）には内側耐火物（３）が
設けられて出鋼口（４）が形成されている。Further, a refractory lining (5) is set inside the steel shell (1), and an inner refractory (3) is provided on the tapping metal fitting (2) to form a tapping port (4). ing.
ところで、転炉にとっての問題は、転炉の内部から出
鋼口の内部に到る付近の耐火物の消耗が極めて激しく、
鉄皮（１）とダブリング（６）の溶損が進行して溶損孔
が生じることである。By the way, the problem for the converter is that the refractories near the inside of the converter to the inside of the tapping hole are extremely consumed,
The erosion of the iron shell (1) and the doubling (6) proceeds to form erosion holes.
従来、転炉に溶損孔が生じると、40〜60日間の工期を
かけて更新していたが、例えこの更新間隔が５〜10年に
一回程度とはいえ、所要補修費用は10億にも及び極めて
莫大であった。Conventionally, when a erosion hole is generated in a converter, it is renewed over a construction period of 40 to 60 days. However, even though this renewal interval is about once every 5 to 10 years, the required repair cost is 1 billion. It was extremely huge.
このような実状に鑑み、近年では溶損孔の補修費の低
減を図るべく、以下に説明するような方法により補修が
行われるようになってきている。In view of such a situation, in recent years, in order to reduce the repair cost of the erosion hole, the repair has been performed by the method described below.
即ち、転炉の内張耐火物をそのままにして、外側から
ダブリングと出鋼口とを撤去すると共に、露出部の溶損
孔の大きさの程度に応じて、例えば小さい場合には栓溶
接により溶損孔を埋込み、また大きい場合にはこの溶損
孔部位に新部材を嵌込んで合わせ面を片面溶接すると共
に、その後に新品の出鋼口金物とダブリングとを溶接し
ている。That is, while leaving the refractory lining of the converter as it is, removing the doubling and the tapping port from the outside, and according to the size of the erosion hole of the exposed portion, for example, by plug welding when small, The erosion hole is buried. If the erosion hole is large, a new member is fitted into the erosion hole portion and the mating surface is welded on one side, and then a new tapping metal fitting and a doubling are welded.
勿論、上記した補修方法により所期の目的を達し得る
が、補修後の転炉の寿命が必ずしも充分ではないという
問題があるのに加えて、新品の出鋼口金物とダブリング
とを使用しなければならず、補修費の節減も必ずしも充
分とはいえなかった。Of course, the intended purpose can be achieved by the above-described repair method, but in addition to the problem that the life of the converter after repair is not always sufficient, a new tapping metal fitting and doubling must be used. The reduction in repair costs was not always sufficient.
ならば、旧品を再使用すれば補修費の削減におおいに
寄与し得るものと考えられるが、複雑で頻繁な熱応力に
よる疲労亀裂の発生等の理由により、新品に交換するの
が常識となっていた。If this is the case, it is thought that re-use of the old product can greatly contribute to the reduction of repair costs, but it is common sense to replace it with a new one due to the occurrence of fatigue cracks due to complex and frequent thermal stress. I was
従って、本発明は補修後の寿命を延長し得、かつ補修
費を削減し得る転炉の溶損孔の補修方法の提供を目的と
する。Accordingly, an object of the present invention is to provide a method for repairing a erosion hole of a converter, which can extend the life after repair and reduce the repair cost.
本発明は上記した問題の解決を図るためになされたも
のであって、従って本発明に係る転炉出鋼口付近の溶損
孔の補修方法の要旨は、転炉の鉄皮の外周に突設された
出鋼口の基端付近において、該出鋼口の出鋼口金物に外
嵌されると共に鉄皮に沿わせて溶接されているダブリン
グの外面に生じる溶損孔を補修するに際して、前記溶損
孔の近傍の内張耐火物と出鋼口の内側耐火物とを撤去
し、該溶損孔の径縁より所定幅広い範囲のダブリングの
一部を除去し、該ダブリングの一部除去により露出した
露出部に開口する溶損孔の径縁より50〜100mmの範囲を
切除し、該切除部に新部材を嵌込んで溶接すると共に、
前記除去したダブリングの一部の除去部にも新部材を嵌
込んで前記溶接を覆って溶接することを特徴とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and therefore, the gist of the method for repairing a erosion hole near a converter tap hole according to the present invention is to project from the outer periphery of a steel shell of a converter. In the vicinity of the base end of the tap hole provided, when repairing a erosion hole formed on the outer surface of the doubling which is externally fitted to the tap hole of the tap hole and is welded along the steel shell, The refractory lining near the erosion hole and the refractory inside the tap hole are removed, a part of the doubling within a predetermined wide range from the rim of the erosion hole is removed, and a part of the doubling is removed. A range of 50 to 100 mm is cut out from the rim of the erosion hole that opens to the exposed portion exposed by the method, and a new member is fitted and welded to the cut portion,
A new member is inserted into a part of the removed portion of the doubling to cover and weld the welding.
本考案に係る転炉の溶損孔の補修方法によれば、溶損
孔の近傍の内張耐火物と出鋼口の内側耐火物とが撤去さ
れ、火炎が部材を貫通し得るので、ガスバーナで露出さ
れた面に開口する溶損孔の孔縁から50〜100mmの範囲を
容易に除去することができ、そしてこの範囲の除去によ
って、少なくとも熱影響による劣化の激しい結晶粒粗大
領域や降伏点低下領域等の劣化領域が除去される。According to the method for repairing the eroded hole of the converter according to the present invention, the lining refractory near the eroded hole and the refractory inside the tapping hole are removed, and the flame can penetrate the member. The range of 50 to 100 mm can be easily removed from the hole edge of the erosion hole that opens on the surface exposed by the above, and by removing this range, at least the crystal grain coarse area and the yield point, which are severely degraded by heat influence, Degraded areas such as reduced areas are removed.
このように、劣化領域が除去されるので残部では高強
度が確保されると共に、切除した劣化領域に相当する形
状の新部材と、ダブリングの一部を構成する新部材とが
溶接されるため、これらの補修部位に高強度を確保する
ことができる。As described above, since the deteriorated region is removed, high strength is secured in the remaining portion, and a new member having a shape corresponding to the cut-out deteriorated region and a new member constituting a part of the doubling are welded. High strength can be ensured at these repair sites.
しかも、これらの新部材の溶接のみであるから、溶接
量が少なくて済むのに加えて、これら溶接部の溶接線が
互いにずれる結果、溶接歪みにより生じる応力集中が緩
和される。In addition, since only these new members are welded, the amount of welding is small, and the welding lines of these welds are shifted from each other, so that stress concentration caused by welding distortion is reduced.
本考案に係る１実施例を、溶損孔の補修状況説明図の
第１図と第２図とを参照しながら、従来と同一のもの及
び同一機能を有するものを同一符号を以て説明する。但
し、転炉の構成は従来と同構成であるから転炉構成に係
る説明は割愛する。One embodiment according to the present invention will be described with reference to FIG. 1 and FIG. 2 showing the repair status of a erosion hole. However, since the configuration of the converter is the same as that of the related art, the description of the converter configuration is omitted.
第１図は、転炉の鉄皮（１）に生じた溶損孔（ｈ）の
近傍の内張耐火物、出鋼口の内側耐火物を撤去し、また
溶損孔（ｈ）の近傍のダブリングと出鋼口金物との一部
を除去した状態を示している。FIG. 1 shows the removal of the refractory lining near the erosion hole (h) generated in the steel shell (1) of the converter, the refractory inside the tapping hole, and the vicinity of the erosion hole (h). 2 shows a state in which a part of the doubling and a tapping metal fitting are removed.
即ち、同図に示すように、溶損孔（ｈ）の周片より広
範囲のダブリング（６）の一部をガウジングにより除去
すると共に、鉄皮（１）と出鋼口金物（２）の熱劣化部
位、つまり結晶粒が粗大になって脆くなった部位をガス
バーナで切除する。That is, as shown in the figure, a part of the doubling (6), which is wider than the peripheral piece of the erosion hole (h), is removed by gouging, and the heat of the steel shell (1) and the tapping metal fitting (2) is removed. The deteriorated part, that is, the part where the crystal grains become coarse and brittle, is cut off with a gas burner.
ところで、このような切除作業を行うに際して、結晶
粒の粗大化領域のミクロ組織を主体にその硬度、引張強
度および切欠靭性によって調べ、そしてこの粗大化領域
の確認により溶損孔（ｈ）の孔縁より50〜100mmの範囲
を切除すれば不良な劣化領域を完全に除去し得ることを
確認した。By the way, when such a cutting operation is performed, the microstructure in the coarsened region of the crystal grain is mainly examined by its hardness, tensile strength and notch toughness, and the hole of the erosion hole (h) is confirmed by confirming the coarsened region. It was confirmed that if a range of 50 to 100 mm was cut off from the edge, the defective deteriorated area could be completely removed.
次いで、これらの切除部の形状に対応する鉄皮部分
（1p）と出鋼口金物部分（2p）とを製作し、第２図に示
すように、これらを対応位置に嵌込み、嵌込み線に沿っ
て溶接すると共に、溶接ビードの余盛り部グラインダー
により平滑に仕上げた。Next, an iron shell portion (1p) and a tapping metal fitting portion (2p) corresponding to the shapes of these cut portions are manufactured, and as shown in FIG. Along with welding, and finished smoothly with a weld bead extra height grinder.
さらに、ダブリング（６）の切除部位に相当するダブ
リング部位（6p）を製作し、これを補修済みの鉄皮
（１）の表面に沿わせると共に、これをダブリング
（６）の残部と鉄皮（１）と出鋼口金物（２）とに溶接
した。Further, a doubling portion (6p) corresponding to a cut portion of the doubling (6) is manufactured, and the doubling portion (6p) is formed along the surface of the repaired iron skin (1). 1) and a tapping metal fitting (2).
勿論、以上の作業終了後は、耐火物の撤去部に新品の
耐火物がそれぞれ配設されることとなる。Of course, after the above operation is completed, new refractories are to be disposed respectively in the refractory removal section.
このように、従来の補修方法と異なり、劣化部位が除
去されるので高強度を確保し得ると共に、この切除部位
より広範囲を覆ってダブリング（６）の一部を構成する
新部材になるダブリング部分（6p）が溶接されるので溶
接線がずれる結果、溶接歪みにより生じる応力集中が緩
和され、補修後の転炉に対してより高信頼性が付与され
る。As described above, unlike the conventional repair method, the deteriorated portion is removed, so that high strength can be ensured. In addition, a doubling portion which covers a wide area from the cut portion and becomes a new member constituting a part of the doubling (6). Since (6p) is welded, the welding line is shifted, so that stress concentration caused by welding distortion is reduced, and higher reliability is given to the repaired converter.
しかも、新部材は出鋼口金物の一部の出鋼口金物部分
（2p）とダブリングの一部のダブリング部分（6p）だけ
であるから材料費、溶接量も削減し得るので従来より少
ない費用で、３〜４昼夜の作業で溶損孔（ｈ）の補修作
業を終了することができた。In addition, the new parts are only the tapping base part (2p) of the tapping base and the doubling part (6p) of the doubling, so that the material cost and welding amount can be reduced, so the cost is lower than before. Thus, the repair work of the erosion hole (h) could be completed in the work of 3 to 4 days and nights.
なお、上記した実施例は本発明の具体例にすぎず、従
って上記実施例によって本発明の技術的思想の範囲が限
定されるものではない。The above embodiments are merely specific examples of the present invention, and therefore, the scope of the technical idea of the present invention is not limited by the above embodiments.
以上詳述したように、溶損孔の近傍の内張耐火物と出
鋼口の内側耐火物とが撤去されていて、部材を火炎が貫
通するので、劣化部位を容易に除去でき、また劣化部位
が除去されるので高強度を確保し得るのに加えて、この
切除範囲よりも広範囲を覆ってダブリングの一部を構成
する新部材が溶接されるので、溶接線が互いにずれる結
果、溶接歪みにより生じる応力集中が緩和され、補修後
の寿命の延長が可能になると共に、出鋼口金物のダブリ
ングとの一部分の製造で済み溶接作業量も減少し、補修
後の転炉の信頼性の向上と補修費の削減とに対して極め
て多大な効果を奏する。As described in detail above, the refractory lining near the erosion hole and the refractory inside the tap hole are removed, and the flame penetrates the member, so that the deteriorated portion can be easily removed, and Since the parts are removed, high strength can be ensured, and in addition, new members that form a part of the doubling are welded over a wider area than this cut area, so that the welding lines are shifted from each other, resulting in welding distortion. The stress concentration caused by the mitigation is alleviated, the service life after repair can be prolonged, and the welding work done by doubling the tapping metal fittings also decreases, improving the reliability of the converter after repair. This has an extremely great effect on the reduction of repair costs.
第１図と第２図は本考案の実施例に係る溶損孔の補修状
況説明図、第３図は転炉の出鋼口付近の断面構成説明図
である。 （１）……転炉の鉄皮、（1p）……鉄皮部分、（２）…
…出鋼口金物、（2p）……出鋼口金物部分、（３）……
筒状耐火物、（４）……出鋼口、（５）……内張耐火
物、（６）……ダブリング、（6p）……ダブリング部
分、（ｈ）……溶損孔。FIG. 1 and FIG. 2 are explanatory views of a repair state of a erosion hole according to an embodiment of the present invention, and FIG. (1) ... Steel of converter, (1p) ... Steel part, (2) ...
… Steel tap fitting, (2p) …… Steel tap fitting part, (3) ……
Cylindrical refractory, (4) ... tap hole, (5) ... lined refractory, (6) ... doubling, (6p) ... doubling portion, (h) ... erosion hole.
Claims (1)
端付近において、該出鋼口の出鋼口金物に外嵌されると
共に鉄皮に沿わせて溶接されているダブリングの外面に
生じる溶損孔を補修するに際して、 前記溶損孔の近傍の内張耐火物と出鋼口の内側耐火物と
を撤去し、該溶損孔の径縁より所定幅広い範囲のダブリ
ングの一部を除去し、該ダブリングの一部除去により露
出した露出部に開口する溶損孔の径縁より50〜100mmの
範囲を切除し、該切除部に新部材を嵌込んで溶接すると
共に、前記除去したダブリングの一部の除去部にも新部
材を嵌込んで前記溶接を覆って溶接することを特徴とす
る転炉の溶損孔の補修方法。1. A steel tap of a converter is provided with an outer fitting near a base end of a tapping port protruding from an outer periphery of a steel shell of the converter tap, and is welded along the steel shell. In repairing the erosion hole generated on the outer surface of the doubling, the lining refractory near the erosion hole and the refractory inside the tapping hole are removed, and a predetermined wide range from the rim of the erosion hole is removed. A part of the doubling is removed, a range of 50 to 100 mm is cut off from the rim of the erosion hole that opens to the exposed part exposed by removing the part of the doubling, and a new member is fitted into the cut part and welded. A method of repairing a erosion hole of a converter, wherein a new member is fitted into a part of the removed doubling to cover and weld.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9728490A JP2750200B2 (en) | 1990-04-11 | 1990-04-11 | Repair method for melted holes in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9728490A JP2750200B2 (en) | 1990-04-11 | 1990-04-11 | Repair method for melted holes in converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03294412A JPH03294412A (en) | 1991-12-25 |
| JP2750200B2 true JP2750200B2 (en) | 1998-05-13 |
Family
ID=14188216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9728490A Expired - Lifetime JP2750200B2 (en) | 1990-04-11 | 1990-04-11 | Repair method for melted holes in converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2750200B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864277A (en) * | 2012-09-25 | 2013-01-09 | 鞍钢股份有限公司 | Repairing method for scrap steel tank |
-
1990
- 1990-04-11 JP JP9728490A patent/JP2750200B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864277A (en) * | 2012-09-25 | 2013-01-09 | 鞍钢股份有限公司 | Repairing method for scrap steel tank |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03294412A (en) | 1991-12-25 |
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