JPS6362316B2 - - Google Patents
Info
- Publication number
- JPS6362316B2 JPS6362316B2 JP55113388A JP11338880A JPS6362316B2 JP S6362316 B2 JPS6362316 B2 JP S6362316B2 JP 55113388 A JP55113388 A JP 55113388A JP 11338880 A JP11338880 A JP 11338880A JP S6362316 B2 JPS6362316 B2 JP S6362316B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- stainless steel
- exchanger tube
- steel pipe
- austenitic stainless
- 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
Links
- 239000000463 material Substances 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 238000005260 corrosion Methods 0.000 claims description 24
- 230000007797 corrosion Effects 0.000 claims description 24
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 15
- 229910001026 inconel Inorganic materials 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 2
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 238000003466 welding Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 238000012546 transfer Methods 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 229910018487 Ni—Cr Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- 150000003682 vanadium compounds Chemical class 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Description
〔産業上の利用分野〕
本発明は、例えば油焚ボイラなどのように燃焼
灰中にバナジウム化合物の如き腐食性成分を含む
ボイラの伝熱管における異材継手部に係り、特に
高温腐食環境下において優れた耐腐食性を有する
異材継手部に関する。
〔従来の技術〕
第１図に示すように、事業所用ボイラの煙道に
は二次過熱器１や再熱器２などの熱交換器が配置
されている。これらの熱交換器用の熱伝熱管とし
て、主にSTBA24のようなクロム（Cr）―モリ
ブデン（Mo）鋼管３が使用されているが、蒸気
温度が高い出口側ヘツダ４寄りの伝熱管には、高
温下での機械的強度がより高く要求されること
や、耐蒸気酸化性の点から通常はSUS321のよう
なオーステナイト系ステンレス鋼管５が用いられ
ていることが多い。このためCr―Mo鋼管３とオ
ーステナイト系ステンレス鋼管５の異材継手を行
なわなければならない。
前記オーステナイト系ステンレス鋼としては、
例えばSUS321（18Cr―10Ni―1Ti）、SUS304
（18Cr―8Ni）、SUS316（18Cr―10Ni）、SUS347
（18Cr―12Ni―1Nb）などが用いられている。一
方、Cr―Mo鋼としては、例えば2.25Cr―1Mo
（STBA24）、1Cr―0.5Moなどが用いられている。
第２図は、この溶接状態の具体例を示す断面図
である。例えば外径50.8mmで肉厚6.7mmの
STBA24鋼管６と、外径50.8mmで肉厚4.5mmの
SUS321鋼管７とを溶接する場合、これら両管
６，７を直接溶接しないで、その間に一端の肉厚
が6.7mmで他端の肉厚が4.5mmのSUS321鋼管製の
短管８を用い、STBA24鋼管６と短管８をイン
コネル82のようなインコネル系溶接材９で、また
SUS321鋼管７と短管８を16Cr―8Ni―2Moのよ
うなステンレス系溶接材１０でそれぞれ溶接す
る。
ところで、油焚ボイラの過熱器や再熱器では、
油中に含まれているイオウ、ナトリウム、バナジ
ウムなどの化合物を主成分とする燃焼灰により、
バナジウムアタツクと呼ばれる高温腐食が発生す
る。
第９図は、実験室的に行なわれている油燃焼ガ
ス中での鋼材の耐腐食性特性図である。図中の〇
印はSTBA24、●印はSUS321、▲印はSUS347
の特性値である。なおこの実験は、85％V2O5―
15％Na2SO4の環境下において、550℃、600℃、
650℃、700℃の各温度で100時間テストを行なつ
たときの試験片の腐食量を測定した。
この図から明らかなように、実験室的には、
Cr―Mo鋼（〇印のSTBA24）よりもCr含有率の
大きいステンレス鋼（●印のSUS321や▲印の
SUS347）の方が耐腐食性に優れているとされて
いる。
〔発明が解決しようとする課題〕
しかし、実際の油焚ボイラ内でのオーステナイ
ト系ステンレス鋼管とCr―Mo鋼管との溶接部
（異材継手部）においては、燃焼ガス組成や管壁
温度がほとんど両者同一条件であるにも拘ず、
Cr―Mo鋼管よりも耐腐食性に優れていると言わ
れていたステンレス鋼管の方が激しく高温腐食し
ていることを本発明者らは見出した。
第３図は、重油焚ボイラを約６万時間運転した
場合の伝熱管における異材継手部の高温腐食状況
を示す図で、図中の破線は腐食前状態を示してい
る。
次の表は、その伝熱管の腐食後の外径寸法を測
定した結果を示すものである。なお、伝熱管の公
称外径は50.8mm、測定は第４図に示すように〜
14の14個所で行ない、図中の矢印で示す間隔ｌは
それぞれ50mmの間隔であり、表中の（ ）中の数
値は減肉寸法を示している。
[Industrial Application Field] The present invention relates to a dissimilar material joint in a heat exchanger tube of a boiler such as an oil-fired boiler that contains corrosive components such as vanadium compounds in the combustion ash, and is particularly suitable for use in a high-temperature corrosive environment. The present invention relates to a dissimilar material joint having corrosion resistance. [Prior Art] As shown in FIG. 1, heat exchangers such as a secondary superheater 1 and a reheater 2 are arranged in the flue of a boiler for business use. Chromium (Cr)-molybdenum (Mo) steel pipes 3 such as STBA24 are mainly used as heat transfer tubes for these heat exchangers, but for the heat transfer tubes near the outlet side header 4 where the steam temperature is high, Usually, an austenitic stainless steel pipe 5 such as SUS321 is often used because higher mechanical strength is required under high temperatures and steam oxidation resistance. For this reason, it is necessary to perform a dissimilar metal joint between the Cr--Mo steel pipe 3 and the austenitic stainless steel pipe 5. As the austenitic stainless steel,
For example, SUS321 (18Cr-10Ni-1Ti), SUS304
(18Cr-8Ni), SUS316 (18Cr-10Ni), SUS347
(18Cr-12Ni-1Nb) etc. are used. On the other hand, as Cr-Mo steel, for example, 2.25Cr-1Mo
(STBA24), 1Cr-0.5Mo, etc. are used. FIG. 2 is a sectional view showing a specific example of this welded state. For example, if the outer diameter is 50.8 mm and the wall thickness is 6.7 mm.
STBA24 steel pipe 6 with an outer diameter of 50.8 mm and a wall thickness of 4.5 mm.
When welding the SUS321 steel pipe 7, do not directly weld these two pipes 6 and 7, but use a short pipe 8 made of SUS321 steel pipe with a wall thickness of 6.7 mm at one end and a wall thickness at the other end of 4.5 mm between them. STBA24 steel pipe 6 and short pipe 8 are welded using Inconel welding material 9 such as Inconel 82.
The SUS321 steel pipe 7 and the short pipe 8 are each welded using a stainless steel welding material 10 such as 16Cr-8Ni-2Mo. By the way, in the superheater and reheater of oil-fired boilers,
Combustion ash, whose main components are compounds such as sulfur, sodium, and vanadium contained in the oil,
High-temperature corrosion called vanadium attack occurs. FIG. 9 is a diagram showing the corrosion resistance characteristics of steel materials in oil combustion gas conducted in a laboratory. In the diagram, ○ mark is STBA24, ● mark is SUS321, ▲ mark is SUS347
is the characteristic value of In this experiment, 85%V 2 O 5 -
In an environment of 15% Na 2 SO 4 , 550℃, 600℃,
The amount of corrosion on the test piece was measured after testing for 100 hours at each temperature of 650°C and 700°C. As is clear from this figure, in the laboratory,
Stainless steel with a higher Cr content than Cr-Mo steel (STBA24 marked with ○) (SUS321 marked with ● and SUS321 marked with ▲)
SUS347) is said to have better corrosion resistance. [Problem to be solved by the invention] However, in an actual oil-fired boiler, in the welded part (dissimilar metal joint) between an austenitic stainless steel pipe and a Cr-Mo steel pipe, the combustion gas composition and pipe wall temperature are almost the same. Despite the same conditions,
The present inventors have discovered that stainless steel pipes, which are said to have better corrosion resistance than Cr-Mo steel pipes, are more severely corroded at high temperatures. FIG. 3 is a diagram showing high-temperature corrosion of dissimilar metal joints in heat exchanger tubes when a heavy oil-fired boiler has been operated for about 60,000 hours, and the broken line in the diagram shows the state before corrosion. The following table shows the results of measuring the outer diameter dimensions of the heat exchanger tubes after corrosion. The nominal outer diameter of the heat transfer tube is 50.8 mm, and the measurements are as shown in Figure 4.
The spacing l shown by the arrows in the figure is 50 mm each, and the numbers in parentheses in the table indicate the thickness reduction dimensions.
本発明はこうした、所謂、バナジウムアタツク
が発生する腐食性環境下でしかも熱サイクルが繰
返されるボイラ伝熱管のオーステナイト系ステン
レス鋼管とCr―Mo鋼管との異材継手部という特
殊な構成、条件下において、ステンレス鋼管の特
異な腐食現象を解明し、それを防止するために次
のような構成にしたことを特徴とするものであ
る。
すなわち、インコネル材料やNi―Cr混合溶射
金属などの如き、オーステナイト系ステンレス鋼
より耐高温腐食性を有し、オーステナイト系ステ
ンレス鋼よりも熱膨張係数が小さい材料を用い
て、前記異材継手部の少なくともオーステナイト
系ステンレス鋼管の溶接部付近を被覆したことを
特徴とするものである。
〔作 用〕
前述のインコネル材料の熱膨張係数は周知のよ
うに約14.4×10-6mm／mm／℃、Ni―Cr溶射金属の
熱膨張係数は約17×10-6mm／mm／℃である。この
ようにオーステナイト系ステンレス鋼管よりも熱
膨張係数の小さい材料の肉盛溶接あるいは溶射層
を形成してステンレス鋼管の表面を被覆すること
により、ステンレス鋼管の特に応力、歪が集中し
やすい溶接部付近の変形を拘束するとともに、前
述のようにポーラスで剥離しやすい酸化被膜が形
成されてもそれの亀裂の発生ならびに局所的な剥
離を抑制して、耐腐食性の向上を図るものであ
る。
〔実施例〕
本発明者らは、SUS321、16Cr―8Ni―2Mo、
インコネル82、80Ni―20Cr溶射金属、50Ni―
50Cr溶射金属などの各試験片の油灰腐食試験を
行ない、その結果を第５図に示す。なお、この試
験は85重量％のV2O5と15重量％のNa2SO4の存在
下で、各試験片を700℃で100時間加熱した際の減
肉寸法を測定したものである。
この図から明らかなように、16Cr―8Ni―2Mo
はSUS321の約1.3倍、インコネル82は約３倍の耐
高温腐食性を示し、Ni―Crの純金属の混合溶射
金属はさらに優れた耐高温腐食性を有しているこ
とを確認した。
第６図ないし第８図は、本発明の各実施例によ
る異材継手部の断面図である。
第６図に示す第１実施例の場合、STBA24鋼
管６とSUS321鋼管７は、SUS321鋼管製の短管
８を介して、STBA24鋼管６と短管８との間が
インコネル82の溶接材９で、SUS321鋼管７と短
管８との間が16Cr―8Ni―2Moの溶接材１０で、
それぞれ溶接されている。
そしてインコネル82の溶接材９による溶着金属
部分から、短管８、16Cr―8Ni―2Moの溶接材１
０による溶着金属部分、SUS321鋼管７の溶接材
１０による溶着金属部分の近傍にかけての外周面
が、インコネル82に肉盛り１１によつて覆われて
いる。
第７図に示す第２実施例の場合、インコネル82
の肉盛り１１がRTBA24鋼管６の端部まで延び
ている点で、前記第１実施例と相違している。
第８図に示す第３実施例の場合、インコネル82
の肉盛り１１の代りに50Ni―50Cr溶着金属１２
で異材継手部の外周面を覆つた点で前記第２実施
例と異なる。なお、溶射する前に溶接材９，１０
による肉盛部をグラインダなどで除去して平滑に
した方が、溶着層の溶着性が良い。
SUS321鋼管７などのオーステナイト系ステン
レス鋼の外表面に施こされる肉盛り１１や溶射１
２などの耐高温腐食性被覆の範囲は、ボイラの種
類などによつて一概には決められないが、数百mm
あれば十分であると考える。
〔発明の効果〕
本発明は前述のような構成になつており、油焚
ボイラなどのボイラのオーステナイト系ステンレ
ス鋼からなる伝熱管と、Cr―Mo系フエライト鋼
からなる伝熱管との異材継手部において、バナジ
ウム化合物の如き腐食性成分を含む燃焼灰の付着
による異材継手部付近に発生するステンレス鋼製
伝熱管の特異な局部腐食を有効に防止することが
できるものである。
The present invention has been developed under the special configuration and conditions of a dissimilar material joint between an austenitic stainless steel pipe and a Cr-Mo steel pipe of a boiler heat exchanger tube under a corrosive environment where so-called vanadium attack occurs and where thermal cycles are repeated. The present invention is characterized by elucidating the peculiar corrosion phenomenon of stainless steel pipes and adopting the following structure to prevent it. That is, by using a material such as Inconel material or Ni-Cr mixed sprayed metal, which has higher temperature corrosion resistance than austenitic stainless steel and has a smaller coefficient of thermal expansion than austenitic stainless steel, at least It is characterized by coating the vicinity of the welded part of the austenitic stainless steel pipe. [Function] As is well known, the coefficient of thermal expansion of the above-mentioned Inconel material is approximately 14.4×10 -6 mm/mm/°C, and the coefficient of thermal expansion of the Ni-Cr sprayed metal is approximately 17×10 -6 mm/mm/°C. It is. In this way, by coating the surface of the stainless steel pipe with overlay welding or by forming a thermal sprayed layer of a material with a smaller coefficient of thermal expansion than that of the austenitic stainless steel pipe, welding areas where stress and strain are likely to concentrate, especially around the stainless steel pipe. In addition to restraining the deformation of the oxide film, even if a porous and easily peeled oxide film is formed as described above, it suppresses the occurrence of cracks and local peeling of the oxide film, thereby improving corrosion resistance. [Example] The present inventors made SUS321, 16Cr-8Ni-2Mo,
Inconel 82, 80Ni―20Cr sprayed metal, 50Ni―
An oil ash corrosion test was conducted on each specimen such as 50Cr thermal sprayed metal, and the results are shown in Figure 5. In this test, the thickness reduction dimension was measured when each test piece was heated at 700° C. for 100 hours in the presence of 85% by weight V 2 O 5 and 15% by weight Na 2 SO 4 . As is clear from this figure, 16Cr―8Ni―2Mo
showed about 1.3 times the high-temperature corrosion resistance of SUS321, and about 3 times the high-temperature corrosion resistance of Inconel 82, and it was confirmed that the mixed sprayed metal of pure Ni-Cr has even better high-temperature corrosion resistance. 6 to 8 are cross-sectional views of dissimilar material joints according to each embodiment of the present invention. In the case of the first embodiment shown in FIG. 6, the STBA24 steel pipe 6 and the SUS321 steel pipe 7 are connected via a short pipe 8 made of SUS321 steel pipe, and a welding material 9 of Inconel 82 is used between the STBA24 steel pipe 6 and the short pipe 8. , 16Cr-8Ni-2Mo welding material 10 is used between the SUS321 steel pipe 7 and the short pipe 8,
Each is welded. Then, from the welded metal part with welding material 9 of Inconel 82, short pipe 8, welding material 1 of 16Cr-8Ni-2Mo
The outer peripheral surface of the SUS321 steel pipe 7 in the vicinity of the welded metal part made of the welded material 10 and the welded metal part made of the welded material 10 of the SUS321 steel pipe 7 is covered with an overlay 11 on the Inconel 82. In the case of the second embodiment shown in FIG.
This embodiment differs from the first embodiment in that the build-up 11 extends to the end of the RTBA24 steel pipe 6. In the case of the third embodiment shown in FIG.
50Ni-50Cr welded metal 12 instead of overlay 11
This embodiment differs from the second embodiment in that the outer circumferential surface of the dissimilar material joint is covered with the outer circumferential surface of the dissimilar material joint. In addition, before thermal spraying, welding materials 9 and 10
The weldability of the welding layer is better if the built-up portion is smoothed by removing it with a grinder or the like. Overlay 11 and thermal spraying 1 applied to the outer surface of austenitic stainless steel such as SUS321 steel pipe 7
The range of high-temperature corrosion-resistant coating such as 2 cannot be determined unconditionally depending on the type of boiler, etc., but it is several hundred mm.
I think that is sufficient. [Effects of the Invention] The present invention has the above-described structure, and is a dissimilar material joint between a heat exchanger tube made of austenitic stainless steel and a heat exchanger tube made of Cr-Mo ferrite steel of a boiler such as an oil-fired boiler. In this method, it is possible to effectively prevent peculiar local corrosion of stainless steel heat exchanger tubes that occurs near joints of dissimilar materials due to adhesion of combustion ash containing corrosive components such as vanadium compounds.
第１図はボイラにおける熱交換器の一部概略構
成図、第２図はその熱交換器の伝熱管における異
材継手部の断面図、第３図はその継手部の高温腐
食状態を示す断面図、第４図はその伝熱管の腐食
後の外径寸法を測定する位置を示す側面図、第５
図は各試験片の油灰腐食試験結果を示す図、第６
図、第７図、第８図は本発明の各実施例における
異材継手部の断面図、第９図は各試験片における
実験室的腐食試験の結果を示す特性図、第１０図
は前記異材継手部の腐食状態を詳細に説明するた
めの模式図である。
６……STBA24鋼管、６ａ……酸化被膜、７
……SUS321鋼管、８……短管、８ａ……酸化被
膜、１１……肉盛り、１２……溶着部。
Fig. 1 is a partial schematic diagram of a heat exchanger in a boiler, Fig. 2 is a sectional view of a joint of dissimilar materials in a heat exchanger tube of the heat exchanger, and Fig. 3 is a sectional view showing the high temperature corrosion state of the joint. , Figure 4 is a side view showing the position where the outer diameter dimension of the heat transfer tube after corrosion is measured, and Figure 5 is
The figure shows the oil ash corrosion test results for each test piece.
7 and 8 are cross-sectional views of dissimilar material joints in each embodiment of the present invention, FIG. 9 is a characteristic diagram showing the results of a laboratory corrosion test for each test piece, and FIG. It is a schematic diagram for explaining in detail the corrosion state of a joint part. 6...STBA24 steel pipe, 6a... Oxide film, 7
... SUS321 steel pipe, 8 ... Short pipe, 8a ... Oxide film, 11 ... Overlay, 12 ... Welded part.
Claims (1)
管とクロム―モリブデン系フエライト鋼からなる
伝熱管とのボイラの伝熱管異材継手部において、 少なくとも前記オーステナイト系ステンレス鋼
製伝熱管の溶接部近傍の外周面を、オーステナイ
ト系ステンレス鋼よりも耐高温腐食性を有しかつ
オーステナイト系ステンレス鋼よりも熱膨張係数
が小さい材料で被覆したことを特徴とするボイラ
の伝熱管異材継手部。 ２ 特許請求の範囲第１項記載において、前記被
覆材料がインコネル材料であることを特徴とする
ボイラの伝熱管異材継手部。 ３ 特許請求の範囲第１項記載において、前記被
覆材料がニツケルとクロムの混合溶射層であるこ
とを特徴とするボイラの伝熱管異材継手部。[Scope of Claims] 1. In a heat exchanger tube dissimilar joint of a boiler between a heat exchanger tube made of austenitic stainless steel and a heat exchanger tube made of chromium-molybdenum ferritic steel, at least the vicinity of the welded portion of the austenitic stainless steel heat exchanger tube. A heat exchanger tube dissimilar joint for a boiler, the outer peripheral surface of which is coated with a material that has higher temperature corrosion resistance than austenitic stainless steel and has a smaller coefficient of thermal expansion than austenitic stainless steel. 2. A heat exchanger tube dissimilar joint part for a boiler according to claim 1, wherein the coating material is an Inconel material. 3. A heat exchanger tube dissimilar joint for a boiler according to claim 1, wherein the coating material is a mixed sprayed layer of nickel and chromium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55113388A JPS5740191A (en) | 1980-08-20 | 1980-08-20 | Differ material joint part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55113388A JPS5740191A (en) | 1980-08-20 | 1980-08-20 | Differ material joint part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5740191A JPS5740191A (en) | 1982-03-05 |
| JPS6362316B2 true JPS6362316B2 (en) | 1988-12-01 |
Family
ID=14611038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55113388A Granted JPS5740191A (en) | 1980-08-20 | 1980-08-20 | Differ material joint part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5740191A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6081253A (en) * | 1983-10-08 | 1985-05-09 | Kansai Paint Co Ltd | Aqueous pigment dispersion |
| JPH074522B2 (en) * | 1986-04-14 | 1995-01-25 | 株式会社三光開発科学研究所 | Method for dispersing nuclear-substituted zinc salicylate in aqueous medium |
| JP3041770U (en) * | 1997-03-25 | 1997-10-03 | 川崎重工業株式会社 | Boiler heat transfer tube weld structure |
| JP2003130302A (en) * | 2001-10-24 | 2003-05-08 | Sumitomo Metal Mining Co Ltd | Waste heat boiler for flash smelting furnace |
-
1980
- 1980-08-20 JP JP55113388A patent/JPS5740191A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5740191A (en) | 1982-03-05 |
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