JP2003013123A - Method for partially repairing steel shell of blast furnace body - Google Patents
Method for partially repairing steel shell of blast furnace bodyInfo
- Publication number
- JP2003013123A JP2003013123A JP2001199888A JP2001199888A JP2003013123A JP 2003013123 A JP2003013123 A JP 2003013123A JP 2001199888 A JP2001199888 A JP 2001199888A JP 2001199888 A JP2001199888 A JP 2001199888A JP 2003013123 A JP2003013123 A JP 2003013123A
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- Prior art keywords
- welding
- blast furnace
- steel shell
- steel
- shell
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Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、亀裂、溶損などが
発生した鉄皮の損傷部を補修するために、数時間から数
十時間の間送風を休止する休風中に、損傷部分を切り欠
いて除去し、その切欠き部へ新規鉄皮を溶接補修する高
炉炉体鉄皮の部分補修方法に関する。
【０００２】
【従来の技術】一般に、高炉鉄皮は炭素鋼や低合金鋼な
どの材料からなるが、長期に及ぶ高炉の稼動期間中に
は、鉄皮内部の耐火物の損耗に伴う炉内からの熱負荷の
増加や、高炉の高圧操業における炉内圧の影響を受け
て、上記鉄皮に亀裂や溶損といった損傷が生じることが
ある。このような高炉鉄皮の損傷が全体へ進行してしま
った場合には高炉の稼動を停止し、改修を行なうことと
なるが、損傷部が局部的な状態の場合はこの損傷部分を
切り欠いて除去し、その部分を新規の鉄皮と交換する部
分補修を行なうことで操業を継続することが行われてい
る。
【０００３】こうした鉄皮の部分補修は、高炉の操業を
一時的に停止する休風を数時間から数十時間行ない、こ
の休風の間に鉄皮の部分交換を行なうことにより行われ
る。損傷部に新規鉄皮を接合して、鉄皮の部分交換を行
う際に行われる溶接時には、溶接棒の溶接材料として、
一般に、鉄皮材料と同等の引張り強度を有する５０キロ
クラス高張力鋼用の溶接材料が使用される。
【０００４】
【発明が解決しようとする課題】しかしながら、炉体鉄
皮の板厚は２５〜９０mm程度と厚く、また、部分補修で
あるために新規鉄皮を嵌め込んで溶接するという額縁溶
接となることから、溶接継手の拘束度が高い条件にな
る。このため、溶接補修後における溶接残留応力が高く
なる傾向にあり、溶接残留応力による破壊といった事態
が懸念される。
【０００５】したがって、従来にあっては、上記溶接残
留応力による脆性破壊防止や、疲労破壊寿命延長を目的
として、溶接ビード１パス毎にピーニングにより塑性加
工を施したり、ＪＩＳＺ３７００に規定されるような、
溶接後に６００℃前後の後熱処理を施したりする方法が
推奨されている。しかし、いずれの方法も多大な溶接補
修時間を必要とする割には残留応力の低減効果にムラが
あるという問題があった。また高炉の休風中は炉内温度
が低下していくために長時間の休風を行なうことで高炉
操業に支障をきたす可能性がある。このように休風中の
作業は時間の制約が大きいために、一度に補修できる補
修範囲が限られてしまうという問題もあった。
【０００６】本発明は、以上のような点に着目してなさ
れたもので、高炉鉄皮の部分補修という拘束度の高い溶
接継手であっても、簡便な作業により溶接部の残留応力
を低減し、且つ遅れ破壊を防止することができる能率的
な溶接方法による高炉炉体鉄皮の部分補修方法を提供す
ることを課題とする。
【０００７】
【課題を解決するための手段】本発明者らは、溶接対象
とする高炉鉄皮の温度、各種溶接材の性質、ピーニング
の有無のよる溶接残留応力の関係について種々、実験
し、解析を行った。その結果、高炉鉄皮は、休風中でも
５０〜１００℃の温度にあるため、新鉄皮（嵌め込む補
修材）の予熱だけ必要で、被補修部は短時間で昇温する
こと、及び、低合金高張力鋼の溶接に際して、フェライ
ト系ステンレス溶接材料を適用した場合には、ピーニン
グなし、後熱なしの条件下でも溶接部の残留応力が低い
ことを見出した。
【０００８】すなわち、このような見地に基づき、本発
明は、上記課題を解決するために、高炉休風時に、高炉
鉄皮の被補修個所を除去し、その被補修個所に新規鉄皮
を溶接により接合して補修を行なう高炉炉体鉄皮の部分
補修方法において、上記溶接時の溶接材料としてフェラ
イト系ステンレス溶接材料を使用することを溶接するこ
とを特徴とするものである。
【０００９】なお、本発明に係るフェライト系ステンレ
ス溶接材としては、ＪＩＳＺ３２２１に規定されるＤ４
３０系等を例示できる。
【００１０】
【発明の実施の形態】次に、本発明に基づく実施形態に
ついて図面を参照しつつ説明する。高炉の操業を一時的
に停止する休風時に、図１に示すように、高炉鉄皮１に
ついて、劣化・損傷などが生じた被補修部分を額縁状に
開口する。なお、図１では開口部２が矩形形状の場合を
例示しているが、開口部２の輪郭は、六角形形状その
他、どのような形状であっても良い。
【００１１】次に、その開口部２に係合可能な形状の新
規鉄皮３を当該開口部２に嵌め込む。このとき、新規鉄
皮３の外周端面と開口部２との間は、全周に渡って、図
２に示す拡大図のようなルート間隔となるように設定す
る。図２では、新規鉄皮３の外周端面側のみを切り欠い
て片側開先を形成している。次に、高炉の旧鉄皮１と新
規鉄皮３との境界（接合部）に沿ってアーク溶接などの
溶接方式で溶接して両者１，３を接合し溶接継手を構成
することで部分補修が行われる。図２中、符号４は溶接
金属を指す。
【００１２】本実施形態では、上記溶接の際に使用する
溶接材料として、フェライト系ステンレスからなる溶接
棒を使用する。ここで、上記鉄皮１，２は、厚肉の炭素
鋼や合金鋼からなり、炉体鉄皮自体の剛性が高いと共に
額縁溶接であるために溶接部の形状的にも変形し難いの
で、溶接継手の拘束度が高い。特に、溶接厚さが２５mm
以上となるような溶接継手となる場合には、溶接量が多
くなるため溶接残留応力が大きくなり、拘束力が高くな
る。
【００１３】このように、上記高炉鉄皮の部分補修部分
は拘束度の高い溶接継手となるが、本実施形態において
は、溶接材料としてＪＩＳＺ３２２１に規定されている
溶接材の内のフェライト系ステンレス溶接材を採用して
いるので、残留応力の低減が可能となっている。その理
由は、フェライト系ステンレス溶接材では、高い引張応
力を有しながら、０．２％耐力は比較的低いという性質
があるためである。
【００１４】また、高炉鉄皮のような低合金鋼では溶接
部位での拡散性水素割れの可能性があるため、通常溶接
時に予熱が必要となるが、高炉休風中は鉄皮１の温度が
５０〜１００℃と比較的高温に維持されているため、溶
接補修に当っては新規鉄皮３の予熱を行なうだけで、溶
接作業を開始することができ、作業を簡便化することが
できる。
【００１５】
【実施例】本発明の効果を確認するために、上記図１に
併記のように、長さ３ｍ×幅３ｍ×厚さ５０mmの試験材
１の中央に対し、矩形状に長さ０．５ｍ×幅０．５ｍの
開口を開け、その開口部２に、長さ０．４９２ｍ×０．
４９２ｍ×厚さ５０mmの補修部材３（新規鉄皮に相当）
を嵌めて額縁溶接を行なった。
【００１６】上記試験材１及び補修部材３には、いずれ
もＪＩＳＧ３１０６に規定されるＳＭ４９０（引張強さ
４９０〜６１０ＭＰａ）の鋼材を用いた。そして、本願
発明に基づく実施例として、溶接材料にＪＩＳＧ３２２
１に規定されるＤ４３０−１６（引張強さ５２２ＭＰ
ａ，０．２％耐力３１０ＭＰａ）を用いて、ルート間隔
４mmの片側開先で溶接した。
【００１７】また、比較のために、比較例として、溶接
材料にＪＩＳＧ３２１２に規定されるＤ５０１６（引張
強さ５６０ＭＰａ，０．２％耐力４９０ＭＰａ）を用い
てルートギャップ４mmの片側開先で溶接した。すなわ
ち、溶接材料以外は、実施例と同一の条件とした。これ
ら２種の試験体を用いて拘束溶接継手の溶接残留応力測
定を行なった。その結果を図３に示す。
【００１８】この試験は、図２に示すように、溶接継手
の両側表裏にそれぞれ歪ゲージ５を貼付して溶接を行な
い、溶接後の歪を計測することにより溶接により生じた
応力を測定するものである。図３では、各部位に発生し
た応力値を幅で示している。なお、比較例の試験体で
は、溶接後にピーニングを行なったもの、およびピーニ
ングを行なった上に後熱処理を行なった３種類の試験体
についてそれぞれ試験を行っている。上記後熱処理は、
高炉休風中における高炉鉄皮の部分補修作業を想定し
て、片面からパネルヒータを用いて、６００℃で４時間
保持することで行った。
【００１９】図３から分かるように、比較例でピーニン
グや後熱処理を行なわなかったものでは高い溶接残留応
力を示しているのに対し、本実施例ではピーニングや後
熱処理を行なわなくとも、比較例におけるピーニングや
後熱処理を行なったものと同等の溶接残留応力レベルに
留まっている。すなわち、本願発明に基づく部分補修に
おける溶接作業では、溶接の前後でピーニングや後熱を
施さなくても、溶接残留応力のレベルを低く抑えられる
ことが分かる。
【００２０】
【発明の効果】以上説明してきたように、本発明によれ
ば、高炉休風中の高炉鉄皮の部分補修のような拘束度の
高い溶接継手の溶接にフェライト系ステンレス溶接材を
適用することで、後熱処理、ピーニングといった処理を
行なう必要がないため、溶接補修能率の低下を回避する
ことができる。
【００２１】また、補修部の残留応力を低減できること
から、残留応力に起因する脆性破壊や疲労寿命の低下を
防止することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for several hours to several tens of hours for repairing a damaged portion of a steel shell in which cracks, erosion and the like have occurred. The present invention relates to a method for repairing a part of a blast furnace furnace steel shell, in which a damaged part is cut out and removed during a pause in a pause, and a new steel shell is welded and repaired in the cutout. [0002] Generally, a blast furnace steel shell is made of a material such as carbon steel or low alloy steel. However, during a long period of operation of the blast furnace, the inside of the furnace due to wear of refractories inside the steel shell is reduced. In some cases, the iron shell may be damaged by cracking or erosion due to an increase in the heat load from the furnace or the effect of the furnace pressure during the high pressure operation of the blast furnace. If such damage to the blast furnace steel has progressed to the whole, the operation of the blast furnace will be stopped and repairs will be performed.If the damaged part is localized, the damaged part is cut off. The operation is continued by removing parts and replacing the parts with new steel to perform partial repairs. [0003] Such partial repair of the steel shell is performed by temporarily stopping the operation of the blast furnace for several hours to several tens of hours, and performing a partial replacement of the steel shell during the pause. At the time of welding when joining a new steel to the damaged part and performing partial replacement of the steel, as welding material for the welding rod,
Generally, a welding material for a 50-kilometer high-strength steel having a tensile strength equivalent to that of a steel material is used. [0004] However, the furnace shell has a thick plate thickness of about 25 to 90 mm, and a frame welding in which a new steel shell is inserted and welded for partial repair. Therefore, the condition is that the degree of constraint of the welded joint is high. For this reason, welding residual stress after welding repair tends to be high, and there is a concern about a situation such as breakage due to welding residual stress. Therefore, conventionally, for the purpose of preventing brittle fracture due to the above-mentioned welding residual stress and extending the fatigue fracture life, plastic working is performed by peening for each pass of a weld bead or as defined in JISZ3700. ,
A method of performing a post heat treatment at around 600 ° C. after welding is recommended. However, there is a problem that the effect of reducing the residual stress is uneven in spite of the necessity of a long welding repair time in each method. In addition, since the temperature inside the furnace decreases while the blast furnace is closed, there is a possibility that the operation of the blast furnace may be hindered by performing the long-time closed air. As described above, there is a problem that the work range during which the work can be repaired at one time is limited because the work during the cold season is largely restricted by time. The present invention has been made in view of the above points, and reduces the residual stress in a welded portion by a simple operation even in a highly constrained welded joint for partially repairing a blast furnace steel shell. It is another object of the present invention to provide a method for repairing a part of a blast furnace body steel shell by an efficient welding method capable of preventing delayed fracture. The present inventors conducted various experiments on the relationship between the temperature of the blast furnace steel to be welded, the properties of various welding materials, and the welding residual stress depending on the presence or absence of peening. Analysis was performed. As a result, since the blast furnace steel is kept at a temperature of 50 to 100 ° C. even during a cold season, only the preheating of the new steel shell (repair material to be fitted) is required, and the repaired part is heated in a short time. It has been found that when welding a low-alloy high-tensile steel, when a ferritic stainless steel welding material is used, the residual stress in the weld is low even without peening and without post-heating. That is, based on such a viewpoint, the present invention solves the above-mentioned problems by removing a repaired portion of a blast furnace steel shell when a blast furnace is shut down and welding a new steel shell to the repaired portion. In the method for repairing the iron shell of a blast furnace furnace body which is repaired by joining by using a ferrite-based stainless steel welding material as a welding material at the time of welding, the method is characterized by welding. The ferritic stainless steel welding material according to the present invention is D4 specified in JISZ3221.
30 series and the like can be exemplified. Next, an embodiment according to the present invention will be described with reference to the drawings. As shown in FIG. 1, at the time of a calm period when the operation of the blast furnace is temporarily stopped, as shown in FIG. Although FIG. 1 illustrates the case where the opening 2 has a rectangular shape, the contour of the opening 2 may be any shape such as a hexagonal shape. Next, a new steel shell 3 having a shape engageable with the opening 2 is fitted into the opening 2. At this time, the interval between the outer peripheral end face of the new steel shell 3 and the opening 2 is set so as to have a route interval as shown in an enlarged view in FIG. In FIG. 2, only the outer peripheral end face side of the new steel shell 3 is cut out to form a one-sided groove. Next, welding is performed along a boundary (joining portion) between the old steel shell 1 and the new steel shell 3 of the blast furnace by a welding method such as arc welding, and the two are joined together to form a welded joint, thereby partially repairing the joint. Is performed. In FIG. 2, reference numeral 4 indicates a weld metal. In the present embodiment, a welding rod made of ferritic stainless steel is used as a welding material for the above welding. Here, since the steel shells 1 and 2 are made of thick carbon steel or alloy steel, the furnace shell itself has high rigidity and is frame-welded, so that it is difficult to deform the shape of the welded portion. High degree of constraint on welded joints. Especially, the welding thickness is 25mm
In the case of such a welded joint as described above, the welding amount increases, so that the welding residual stress increases and the binding force increases. As described above, the partially repaired portion of the blast furnace steel shell is a welded joint having a high degree of restraint. In the present embodiment, a ferritic stainless steel welded material of the welding material specified in JISZ3221 as a welding material is used. Since the material is used, the residual stress can be reduced. The reason is that the ferritic stainless steel welding material has a property that the 0.2% proof stress is relatively low while having a high tensile stress. [0014] Further, in the case of low alloy steel such as blast furnace steel, preheating is usually required during welding because of the possibility of diffusible hydrogen cracking at the welded portion. Is maintained at a relatively high temperature of 50 to 100 ° C., so that welding work can be started only by preheating the new iron shell 3 in welding repair, and the work can be simplified. . EXAMPLE In order to confirm the effect of the present invention, as shown in FIG. 1, the center of a test material 1 having a length of 3 m, a width of 3 m and a thickness of 50 mm was rectangularly shaped. An opening of 0.5 m × 0.5 m width is opened, and the opening 2 has a length of 0.492 m × 0.
Repair member 3 of 492m x 50mm thickness (equivalent to new steel)
And frame welding was performed. As the test material 1 and the repair member 3, a steel material of SM490 (tensile strength of 490 to 610 MPa) specified in JIS G3106 was used. As an example based on the present invention, JIS G322
D430-16 (Tensile strength 522MP
a, 0.2% proof stress of 310 MPa), and welded with a groove on one side with a root interval of 4 mm. For comparison, as a comparative example, a welding material was welded to one side of a groove having a root gap of 4 mm using D5016 (tensile strength: 560 MPa, 0.2% proof stress: 490 MPa) specified in JIS G3212. That is, the conditions were the same as in the example except for the welding material. Using these two types of test specimens, the welding residual stress of the restrained welded joint was measured. The result is shown in FIG. In this test, as shown in FIG. 2, welding is performed by attaching strain gauges 5 to both sides of the welded joint, and the stress generated by welding is measured by measuring the strain after welding. It is. In FIG. 3, the stress value generated at each part is indicated by a width. In the test specimens of the comparative examples, tests were performed on three kinds of test specimens that were subjected to peening after welding, and three kinds of specimens that were subjected to post-heat treatment after peening. The above post heat treatment is
Assuming a partial repair work of the blast furnace iron shell during the blast furnace air shut-off, the blast furnace was maintained at 600 ° C. for 4 hours using a panel heater from one side. As can be seen from FIG. 3, the comparative example without the peening or the post heat treatment shows a high welding residual stress, whereas the present example shows the comparative example without the peening or the post heat treatment. At the same welding residual stress level as that obtained after peening and post heat treatment. That is, in the welding work in the partial repair based on the present invention, it can be seen that the level of the residual welding stress can be suppressed to a low level without peening or post-heating before and after welding. As described above, according to the present invention, a ferritic stainless steel welding material is used for welding a welded joint having a high degree of restraint, such as a partial repair of a blast furnace steel shell during a blast furnace blast. By applying, it is not necessary to perform a process such as post-heat treatment or peening, so that a decrease in welding repair efficiency can be avoided. Further, since the residual stress in the repaired portion can be reduced, it is possible to prevent brittle fracture and reduction in fatigue life due to the residual stress.
【図面の簡単な説明】
【図１】本発明に基づく実施形態に係る部分補修を説明
するための図である。
【図２】本発明に基づく実施形態に係る溶接継手部を説
明する図１におけるＡ部分の図である。
【図３】実施例における各溶接継手と溶接残留応力との
関係を説明する図である。
【符号の説明】
１ 鉄皮
２ 開口部
３ 新規鉄皮
４ 溶接金属
５ 歪ゲージBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a partial repair according to an embodiment based on the present invention. FIG. 2 is a view of a portion A in FIG. 1 illustrating a welded joint portion according to an embodiment based on the present invention. FIG. 3 is a diagram illustrating a relationship between each welded joint and a welding residual stress in the example. [Description of Signs] 1 Iron shell 2 Opening 3 New iron shell 4 Weld metal 5 Strain gauge
Claims (1)
除去し、その被補修個所に新規鉄皮を溶接により接合し
て補修を行なう部分補修方法において、上記溶接時の溶
接材料としてフェライト系ステンレス溶接材料を使用す
ることを溶接することを特徴とする高炉炉体鉄皮の部分
補修方法。Claims: 1. A partial repair method for removing a repaired portion of a blast furnace iron shell when a blast furnace is shut down, and welding a new steel shell to the repaired portion by welding to perform repair. A method for repairing a part of a blast furnace body steel shell, which comprises using a ferritic stainless steel welding material as a welding material at the time of welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001199888A JP3627684B2 (en) | 2001-06-29 | 2001-06-29 | Partial repair method for blast furnace core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001199888A JP3627684B2 (en) | 2001-06-29 | 2001-06-29 | Partial repair method for blast furnace core |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2003013123A true JP2003013123A (en) | 2003-01-15 |
| JP2003013123A5 JP2003013123A5 (en) | 2004-09-09 |
| JP3627684B2 JP3627684B2 (en) | 2005-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001199888A Expired - Fee Related JP3627684B2 (en) | 2001-06-29 | 2001-06-29 | Partial repair method for blast furnace core |
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| JP (1) | JP3627684B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964573A (en) * | 2017-12-31 | 2018-04-27 | 安徽马钢工程技术集团有限公司 | A kind of medium blast furnace furnace shell Replacement procedure |
| CN115194404A (en) * | 2021-04-12 | 2022-10-18 | 威博科技巨匠(深圳)有限公司 | Method for repairing local cracks and holes of annular stainless steel strip |
-
2001
- 2001-06-29 JP JP2001199888A patent/JP3627684B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964573A (en) * | 2017-12-31 | 2018-04-27 | 安徽马钢工程技术集团有限公司 | A kind of medium blast furnace furnace shell Replacement procedure |
| CN107964573B (en) * | 2017-12-31 | 2019-07-30 | 安徽马钢工程技术集团有限公司 | A kind of medium blast furnace furnace shell Replacement procedure |
| CN115194404A (en) * | 2021-04-12 | 2022-10-18 | 威博科技巨匠(深圳)有限公司 | Method for repairing local cracks and holes of annular stainless steel strip |
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| Publication number | Publication date |
|---|---|
| JP3627684B2 (en) | 2005-03-09 |
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