JPH083715A - Structure for repairing cracking part of steel material - Google Patents
Structure for repairing cracking part of steel materialInfo
- Publication number
- JPH083715A JPH083715A JP14038894A JP14038894A JPH083715A JP H083715 A JPH083715 A JP H083715A JP 14038894 A JP14038894 A JP 14038894A JP 14038894 A JP14038894 A JP 14038894A JP H083715 A JPH083715 A JP H083715A
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- repair
- metal layer
- repairing
- corrosion
- 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.)
- Pending
Links
Landscapes
- Coating By Spraying Or Casting (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、鋼材に腐食性物質が接
触して発生する亀裂、所謂応力腐食割れ部の補修構造に
関するもので、更に詳しくは高炉用熱風炉の燃焼過程で
生成するNOX に起因する当該鉄皮の応力腐食割れ部の
補修構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for repairing cracks generated when a corrosive substance comes into contact with a steel material, so-called stress corrosion cracking, and more specifically, NO generated in the combustion process of a blast furnace hot blast stove. The present invention relates to the repair structure of the stress corrosion cracking part of the iron shell caused by X.
【0002】[0002]
【従来の技術】熱風炉を含む高炉設備の鉄皮は、通常高
温に晒されることによる材料劣化や、設備の加熱・冷却
の繰り返しもしくは鉄皮の炉内側と炉外側との温度差に
よる熱応力の発生等により亀裂が極めて生じ易い環境に
ある。しかるに高炉操業中にかかる亀裂が生じても操業
を停止することは極めて困難なため、従来から高炉設備
の鉄皮に亀裂が生じた時には亀裂部をいわゆるシ−ル溶
接またはガウジング肉盛溶接、更にこれを補強せしめる
ため補修用鋼材を溶接するなどして亀裂の再発防止や補
修を行っている。2. Description of the Related Art The iron shell of a blast furnace facility including a hot blast stove usually suffers from material deterioration due to exposure to high temperatures, thermal stress due to repeated heating / cooling of the facility or temperature difference between the inside and outside of the furnace. The environment is such that cracks are very likely to occur due to the occurrence of However, even if cracks occur during the operation of the blast furnace, it is extremely difficult to stop the operation. In order to reinforce this, welding of repair steel is carried out to prevent recurrence of cracks and repairs.
【0003】しかしながら、上記従来方法では鉄皮亀裂
の再発防止が必ずしも万全ではないため、これまでに当
該鉄皮亀裂の補修方法あるいは再発防止方法に関して多
くの提案がある。例えば、特開昭51−112704号
公報,特開昭51−112705号公報,特開昭55−
34676号公報には亀裂の再発原因となる熱応力集中
を解除する溶接を中心とする亀裂防止方法が、特開昭5
5−41958号公報,特開平4−9416号公報には
亀裂の再発防止を目的とした鉄皮の補修方法が、また特
開昭49−94504号公報,特開昭55−14855
号公報には高炉の炉壁耐火保護材を含む鉄皮亀裂補修方
法が、更に実開平5−54526号公報には熱応力の緩
和を考慮した高炉用熱風炉鉄皮の二次クラックの発生を
防止する補修構造が提案されている。However, since the above-mentioned conventional method does not always prevent recurrence of the iron skin crack, many proposals have been made so far regarding the repairing method or the recurrence preventing method of the iron skin crack. For example, JP-A-51-112704, JP-A-51-112705, and JP-A-55-
Japanese Patent Laid-Open No. 34676 discloses a crack prevention method centered on welding that cancels the thermal stress concentration that causes the recurrence of cracks.
Japanese Patent Laid-Open Nos. 5-41958 and 4-9416 disclose methods for repairing an iron shell for the purpose of preventing recurrence of cracks, and Japanese Patent Laid-Open Nos. 49-94504 and 55-14855.
Japanese Patent Publication No. 5-52926 discloses a method for repairing a crack of a steel shell containing a fire wall protective material for a blast furnace, and Japanese Utility Model Laid-Open No. 5-54526 discloses the occurrence of a secondary crack in a hot-blast stove iron shell for a blast furnace considering relaxation of thermal stress. Preventive repair structures have been proposed.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、従来の
高炉設備の亀裂補修方法や再発防止方法および前記提案
は、いずれも亀裂の発生原因を熱応力のみとしたもので
あって、腐食性物質の作用を含めた応力腐食割れを考慮
しているものはない。しかるに、高炉設備の中でも特に
熱風炉においては燃焼過程で窒素酸化物NOXが発生
し、それが以下の反応により硝酸HNO3 を生成すると
いわれている。 N2 +O2 →2NO NO+1/2O2 →NO2 2NO2 +H2 O→HNO2 +HNO3 2NO2 +H2 O+1/2O2 →2HNO3 本発明者らが高炉用熱風炉の鉄皮の亀裂を鋭意検討した
ところ、当該鉄皮の亀裂原因は通常の単なる熱応力とい
うよりむしろ、上記燃焼過程で生成する硝酸を主成分と
する腐食性物質を含む応力腐食割れStress Corrosion C
racking (以下「SCC」と称する)であることを見出
だした。このような硝酸を主とする腐食性物質によるS
CCに対して従来の前記補修方法や再発防止方法ではい
ずれの方法においても補修箇所から二次的なSCCが再
発するという欠点があり、且つまたこれまで当該SCC
の補修方法や再発防止方法についてはほとんど提案がな
いのが実情である。However, all of the conventional crack repairing methods and recurrence preventing methods for blast furnace equipment and the above-mentioned proposals use only the thermal stress as the cause of cracking, and the action of corrosive substances. There is no consideration of stress corrosion cracking including. However, it is said that nitrogen oxide NO x is generated in the combustion process in the blast furnace, especially in the hot blast stove, and that nitric acid HNO 3 is generated by the following reaction. N 2 + O 2 → 2NO NO + 1 / 2O 2 → NO 2 2NO 2 + H 2 O → HNO 2 + HNO 3 2NO 2 + H 2 O + 1 / 2O 2 → 2HNO 3 The inventors of the present invention keenly investigated cracks in the iron skin of the blast furnace hot blast furnace. Upon examination, the cause of cracking of the iron shell was not normal thermal stress, but stress corrosion cracking containing a corrosive substance whose main component was nitric acid generated in the combustion process.
It was found to be racking (hereinafter referred to as "SCC"). S due to corrosive substances such as nitric acid
In contrast to CC, the conventional repair methods and recurrence prevention methods have the drawback that secondary SCC recurs from the repaired point in any method, and the SCC
The reality is that there are few proposals regarding repair methods and recurrence prevention methods.
【0005】本発明は、かかる事情に鑑みてなされたも
ので硝酸を主成分とする腐食性物質によって発生した鋼
材のSCCに対して、容易且つ再発防止性に優れた鋼材
の亀裂部の補修構造を提供することを目的とする。The present invention has been made in view of the above circumstances, and is a structure for repairing a crack portion of a steel material which is easy and excellent in recurrence prevention against SCC of a steel material generated by a corrosive substance containing nitric acid as a main component. The purpose is to provide.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
の本発明の補修構造の特徴とするところは、母鋼材、例
えば高炉用熱風炉の鉄皮、に発生した亀裂部を補強せし
めるために溶接固定された補修用鋼材と当該補修用鋼材
の前記母鋼材側表面に形成された耐食性金属層と、耐食
性金属層と母鋼材との間に形成されて耐酸性を有するコ
−ティング材の塗膜層および/または充填層と、を具備
することにある。The feature of the repair structure of the present invention for achieving the above-mentioned object is to reinforce the cracks generated in the base steel material, for example, the iron skin of the hot-blast stove for blast furnace. A welding-fixed repair steel, a corrosion-resistant metal layer formed on the surface of the base steel of the repair steel, and a coating of an acid-resistant coating material formed between the corrosion-resistant metal layer and the base steel. A membrane layer and / or a filling layer.
【0007】[0007]
【作用】本発明の補修構造の特徴は、高炉用熱風炉の亀
裂発生原因を熱応力と腐食との相互作用で発生するSC
Cと考え、腐食性物質に着目している点にある。そのた
め、熱応力のみの作用に着目した前記従来の構造では、
腐食性物質が補修用鋼材の溶接部および/または補修用
鋼材自体に作用することは避けられず、再度SCCが発
生する危険性が極めて高い。The function of the repair structure of the present invention is that the cause of cracks in the hot blast stove for blast furnace is SC generated by the interaction between thermal stress and corrosion.
It is considered to be C, and there is a focus on corrosive substances. Therefore, in the conventional structure focusing only on the action of thermal stress,
It is unavoidable that the corrosive substance acts on the welded portion of the repair steel and / or the repair steel itself, and the risk of SCC occurring again is extremely high.
【0008】即ち、SCCの再発防止を効果たらしめる
ためには、容易且つ効果的に腐食性物質と補修用鋼材の
溶接部および/または補修用鋼材自体との接触を遮断す
ることが肝要である。That is, in order to effectively prevent recurrence of SCC, it is important to easily and effectively cut off the contact between the corrosive substance and the welded portion of the repair steel and / or the repair steel itself. .
【0009】通常母鋼材のSCC部をシ−ル溶接やガウ
ジング肉盛溶接すると、図2に示すように当該応力腐食
割れ部5が凸型に張り出すため、補修用鋼材2の内側を
凹型に加工して当該母鋼材1との密着性を図ることが一
般に行われる。本発明の構成の第一はこの補修用鋼材2
の内側を図1に示すように例えば溶射法やメッキ法等に
よって耐食性金属層3を形成することである。これが補
修用鋼材2と腐食性物質との接触を遮断することにある
ことはいうまでもない。耐食性金属の種類は特に限定す
るものではないが、コストや入手の容易さ等によりAl
またはNi−Cr合金が良い。このうち、溶射法に供す
るNi−Crとしては、Ni50%−Cr50%成分の
ものが最も一般的でありこれで十分である。溶射法の場
合、金属層の厚みは200〜500μm程度が良く、こ
れより薄いと腐食性物質との接触を遮断するに耐久性的
に不十分であり、逆にこれ以上厚くすることは耐久性的
には効果があると思われるが、本発明の目的に対しての
効果はほどんど変わらず、且つコスト高ともなって好ま
しくない。Usually, when the SCC portion of the base steel material is subjected to seal welding or gouging overlay welding, the stress corrosion cracking portion 5 is projected as shown in FIG. 2, so that the inside of the repair steel material 2 is made into a concave shape. It is generally performed by working to improve the adhesion with the base steel material 1. The first constitution of the present invention is this repair steel material 2
As shown in FIG. 1, the inside of the above is formed with the corrosion resistant metal layer 3 by, for example, a thermal spraying method or a plating method. It goes without saying that this is to block the contact between the repair steel material 2 and the corrosive substance. The type of corrosion-resistant metal is not particularly limited, but Al and Al are used due to cost and availability.
Alternatively, a Ni-Cr alloy is preferable. Among these, as Ni-Cr to be subjected to the thermal spraying method, the one having a component of Ni50% -Cr50% is the most common, and this is sufficient. In the case of the thermal spraying method, the thickness of the metal layer is preferably about 200 to 500 μm, and if it is thinner than this, the durability is insufficient to block the contact with the corrosive substance. Although it seems to be effective, the effect for the purpose of the present invention is not substantially changed and the cost is increased, which is not preferable.
【0010】しかるに、溶射法の場合には形成した耐食
性金属層3は通常多孔質となり、このままでは腐食性物
質がこの気孔を通して徐々に補修用鋼材やその溶接部と
の界面に浸透し、溶射した耐食性金属層3を剥離させた
り、当該補修用鋼材2やその溶接部11にSCCを再発
させることになる。However, in the case of the thermal spraying method, the formed corrosion-resistant metal layer 3 is usually porous, and if it is left as it is, the corrosive substance gradually permeates through the pores into the interface between the repairing steel material and its welded portion and is sprayed. The corrosion-resistant metal layer 3 may be peeled off, or SCC may be recurred in the repair steel material 2 or the welded portion 11.
【0011】そこで、本発明の構成の第二は、図1およ
び図3に示すように当該耐食性金属層3の上に更に耐酸
性を有するコ−ティング材の耐酸性塗装膜層4および/
または耐酸性充填層7を形成することである。これを施
すことにより、上記気孔を閉塞せしめることができ腐食
性物質の浸透を抑止することができるため、当該補修用
鋼材2やその溶接部11と腐食性物質との接触を完全に
遮断することができる。当該塗膜層および充填層は、溶
射法で形成せしめた耐食性金属層だけでなくメッキ法等
の他の方法で形成せしめた当該金属層に対しても、特に
補修用鋼材の溶接部のSCCの再発防止に効果的であ
る。Therefore, in the second aspect of the present invention, as shown in FIGS. 1 and 3, the acid-resistant coating film layer 4 and / or the acid-resistant coating film layer 4 of the coating material having acid resistance is further provided on the corrosion-resistant metal layer 3.
Alternatively, the acid-resistant filling layer 7 is formed. By applying this, since it is possible to block the above-mentioned pores and suppress the penetration of corrosive substances, it is necessary to completely block the contact between the repairing steel material 2 or its weld 11 and the corrosive substances. You can The coating layer and the filling layer are applied not only to the corrosion-resistant metal layer formed by the thermal spraying method but also to the metal layer formed by another method such as the plating method, especially for the SCC of the welded portion of the repair steel material. It is effective in preventing recurrence.
【0012】このコ−ティング材は、前記耐食性金属層
の形成後、塗布して耐酸性塗膜層4として形成したもの
を図1に示すように当該母鋼材1の応力腐食割れ部5に
溶接固定しても良いし、図3に示すように前記耐食性金
属層を形成せしめた補修用鋼材2を溶接固定後、当該補
修用鋼材に設けた注入孔6から注入充填して耐酸性充填
層7として形成しても良い。あるいは、耐酸性塗膜層4
と耐酸性充填層7を併用すれば、更に効果的である。This coating material is formed by applying the corrosion resistant metal layer and then forming it as an acid resistant coating layer 4 and welded to the stress corrosion cracking portion 5 of the base steel material 1 as shown in FIG. It may be fixed, or as shown in FIG. 3, after the repair steel material 2 having the corrosion resistant metal layer formed thereon is fixed by welding, it is injected and filled from an injection hole 6 provided in the repair steel material to form an acid resistant filling layer 7. You may form as. Alternatively, the acid resistant coating layer 4
It is even more effective if the acid-resistant filling layer 7 is used together.
【0013】コ−ティング材としては当該補修部の稼働
温度が常温あるいはこれに近い温度の場合には耐酸性を
有するのみで良いが、高温の場合、例えば高炉用熱風炉
の場合には正常な稼働状態の最外面温度として50〜8
0℃に対応できるエポキシ樹脂またはアクリル樹脂等
が、或いは内部の耐火物が破損等した異常な場合も考慮
すれば300℃程度まで対応できる耐熱シリコン樹脂等
が良い。更に、高温となる場合には、当該補修用鋼材に
前記耐食性金属を形成する代わりに、Cr/Ni比が1
8/8のステンレス鋼、例えばSUS304または31
6等をライニング加工したものを用いることも考えらる
が、これらは本目的の耐酸性に対しては必ずしも十分で
ないため好ましくはNi含有率が42%以上の高Ni耐
食鋼をライニング加工して用いるのが良い。また、図4
に示すような当該補修用鋼材2と応力腐食割れ部5の溶
接補修部との隙間に炉内操業圧力より若干高い圧力の不
活性ガス、例えば窒素ガス、をガス注入管8より注入し
内部からの腐食性物質の浸透を抑制する方法も考えられ
るが、これは配管やガス源等を要するなどで本目的には
コスト高で実用性に欠ける。As the coating material, when the operating temperature of the repair section is room temperature or a temperature close to room temperature, it only needs to have acid resistance, but when it is at a high temperature, for example, in the case of a blast furnace hot blast stove, it is normal. 50 to 8 as the outermost surface temperature in the operating state
Epoxy resin or acrylic resin that can withstand 0 ° C., or heat-resistant silicone resin that can withstand up to about 300 ° C. is preferable in consideration of abnormal cases such as damage to the refractory inside. Further, when the temperature is high, the Cr / Ni ratio is 1 instead of forming the corrosion resistant metal on the repair steel material.
8/8 stainless steel, eg SUS304 or 31
It is also possible to use those obtained by lining 6 or the like, but since these are not always sufficient for the acid resistance of the present purpose, it is preferable to lining a high Ni corrosion resistant steel with a Ni content of 42% or more. Good to use. Also, FIG.
The inert gas of a pressure slightly higher than the operating pressure in the furnace, for example, nitrogen gas, is injected into the gap between the repair steel material 2 and the weld repair portion of the stress corrosion cracking portion 5 as shown in FIG. Although a method of suppressing the permeation of the corrosive substance can be considered, this requires a pipe, a gas source, etc., and is costly and not practical for this purpose.
【0014】尚、本発明の方法は高炉用熱風炉の鉄皮亀
裂に限定するものではなく、硝酸のような酸性物質を主
成分とする腐食性物質によるSCCの補修には極めて効
果的である。The method of the present invention is not limited to the cracking of the skin of the hot-blast stove for a blast furnace, and is extremely effective for repairing SCC by a corrosive substance containing an acidic substance such as nitric acid as a main component. .
【0015】[0015]
【実施例】以下、本発明の実施例を示す。 実施例1 高炉用熱風炉のSCC部をシ−ル溶接により補修後、更
に図1に基づいて補修用鋼材2の凹型に加工された面に
Al溶射、およびNi−Cr溶射をいずれも300±1
00μm施して耐食性金属層3を形成後、更にその上か
ら耐熱シリコン樹脂を塗布して耐酸性塗膜層4を形成し
た。これを当該補修部に溶接固定した。尚、比較例とし
て当該金属層および塗膜層のいずれも形成しない従来の
補修用鋼材も作成し、これも当該補修部に溶接固定し
た。その結果、当該金属層および塗膜層を形成した本発
明の補修構造では、補修後24ケ月経過しても未だ何の
変化も見られないのに対して、従来の補修構造では補修
後12ケ月経過後には、補修用鋼材の溶接部より再度S
CCの発生が見られた。 実施例2 高炉用熱風炉のSCC部をシ−ル溶接により補修後、更
に図3に基づいて補修用鋼材2の凹型に加工された面に
Al溶射、およびNi−Cr溶射をいずれも300±1
00μm施して耐食性金属層3を形成後、これを当該補
修部に溶接固定した。その後、当該補修用鋼材に設けら
れた注入孔6より耐熱シリコン樹脂を圧入して、耐酸性
充填層を形成した。この後、当該注入孔6のノズルを補
修用鋼材2の付根から切断し、補修用鋼材2の表面を平
滑処理した。尚、この場合も比較例として当該金属層お
よび充填層のいずれも形成しない従来の補修用鋼材も作
成し、これも当該補修部に溶接固定した。その結果、当
該金属層および充填層を形成した本発明の補修構造で
は、補修後24ケ月経過しても未だ何の変化も見られな
いのに対して、従来の補修構造では補修後12ケ月経過
後には、補修用鋼材の溶接部より再度SCCの発生が見
られた。EXAMPLES Examples of the present invention will be shown below. Example 1 After repairing the SCC part of the hot-blast stove for a blast furnace by seal welding, Al spraying and Ni-Cr spraying were both performed on the surface of the repaired steel material 2 processed into a concave shape based on FIG. 1
After applying a thickness of 00 μm to form the corrosion resistant metal layer 3, a heat resistant silicone resin was further applied thereon to form the acid resistant coating layer 4. This was welded and fixed to the repair part. In addition, as a comparative example, a conventional repair steel material in which neither the metal layer nor the coating layer was formed was also prepared, and this was also welded and fixed to the repair portion. As a result, in the repair structure of the present invention in which the metal layer and the coating layer are formed, no change is observed even after 24 months have passed, whereas in the conventional repair structure, 12 months after the repair. After the lapse of time, S is again applied from the welded portion of the repair steel material.
Occurrence of CC was observed. Example 2 After repairing the SCC portion of the hot-blast stove for a blast furnace by seal welding, Al spraying and Ni-Cr spraying were both performed on the surface of the repaired steel material 2 processed into a concave shape based on FIG. 1
After applying a thickness of 00 μm to form the corrosion-resistant metal layer 3, this was welded and fixed to the repaired portion. After that, a heat-resistant silicone resin was press-fitted through an injection hole 6 provided in the repair steel material to form an acid-resistant filling layer. Then, the nozzle of the injection hole 6 was cut from the root of the repair steel material 2 to smooth the surface of the repair steel material 2. In this case as well, as a comparative example, a conventional repair steel material in which neither the metal layer nor the filling layer was formed was prepared, and this was also welded and fixed to the repair portion. As a result, in the repair structure of the present invention in which the metal layer and the filling layer are formed, no change is observed even after 24 months have passed, whereas in the conventional repair structure, 12 months have passed since the repair. After that, generation of SCC was again seen from the welded portion of the repair steel material.
【0016】[0016]
【発明の効果】以上詳述したように、本発明の補修構造
では高炉用熱風炉の亀裂発生原因を熱応力と腐食との相
互作用で発生するSCCと考え、腐食性物質に着目して
これと補修用鋼材の溶接部および/または補修用鋼材自
体との接触を遮断せしめるように構成することを特徴と
するため、硝酸の様な酸性物質を主成分とする腐食性物
質によって発生したSCCを容易に補修することがで
き、且つ当該補修部からのSCCの再発を効果的に防止
することができる。As described in detail above, in the repair structure of the present invention, the cause of cracks in the hot blast stove for blast furnace is considered to be SCC generated by the interaction between thermal stress and corrosion, and attention is paid to corrosive substances. Is constructed so as to block the contact between the welded portion of the repair steel and / or the repair steel itself, so that SCC generated by a corrosive substance containing an acidic substance such as nitric acid as a main component is removed. It can be easily repaired, and recurrence of SCC from the repaired part can be effectively prevented.
【図1】本発明による耐食性金属層と耐酸性塗膜層より
成る補修構造を示す図。FIG. 1 is a view showing a repair structure including a corrosion resistant metal layer and an acid resistant coating layer according to the present invention.
【図2】従来のシ−ル溶接と補修用鋼材より成る補修構
造を示す図。FIG. 2 is a view showing a repair structure composed of conventional seal welding and repair steel material.
【図3】本発明による耐食性金属層と耐酸性充填層より
成る補修構造を示す図。FIG. 3 is a view showing a repair structure including a corrosion resistant metal layer and an acid resistant filling layer according to the present invention.
【図4】炉内操業圧力より若干高い圧力の不活性ガスを
注入し内部からの腐食性物質の浸透を抑制する方法の概
念図。FIG. 4 is a conceptual diagram of a method of suppressing the permeation of corrosive substances from the inside by injecting an inert gas having a pressure slightly higher than the operating pressure in the furnace.
1.母鋼材,2.補修用鋼材,3.耐食性金属層,4.
耐酸性塗膜層,5.応力腐食割れ部,6.注入孔,7.
耐酸性充填層,8.ガス注入管,9.不活性ガス本管,
10.監視用圧力計,11.溶接部1. Mother steel, 2. Steel for repair, 3. 3. Corrosion resistant metal layer, 4.
Acid resistant coating layer, 5. Stress corrosion cracking part, 6. Injection hole, 7.
Acid-resistant packed bed, 8. Gas injection tube, 9. Inert gas mains,
10. Monitoring pressure gauge, 11. welded part
Claims (2)
めに溶接固定された補修用鋼材と当該補修用鋼材の前記
母鋼材側表面に形成された耐食性金属層と、耐食性金属
層と母鋼材との間に形成されて耐酸性を有するコ−ティ
ング材の塗膜層および/または充填層と、を具備するこ
とを特徴とする鋼材の亀裂部の補修構造。1. A repair steel material fixed by welding to reinforce cracks generated in the base steel material, a corrosion resistant metal layer formed on the surface of the repair steel material on the base steel material side, a corrosion resistant metal layer and a base steel material. And a coating layer and / or a filling layer of a coating material having acid resistance formed between the coating material and the coating layer, and a repair structure for a crack portion of a steel material.
とを特徴とする請求項1記載の鋼材の亀裂部の補修構
造。2. The repair structure for a cracked portion of a steel material according to claim 1, wherein the base steel material is an iron shell of a hot blast stove for a blast furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14038894A JPH083715A (en) | 1994-06-22 | 1994-06-22 | Structure for repairing cracking part of steel material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14038894A JPH083715A (en) | 1994-06-22 | 1994-06-22 | Structure for repairing cracking part of steel material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH083715A true JPH083715A (en) | 1996-01-09 |
Family
ID=15267655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14038894A Pending JPH083715A (en) | 1994-06-22 | 1994-06-22 | Structure for repairing cracking part of steel material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH083715A (en) |
-
1994
- 1994-06-22 JP JP14038894A patent/JPH083715A/en active Pending
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