JP3032341B2 - Manufacturing method of wear-resistant heat transfer tube - Google Patents
Manufacturing method of wear-resistant heat transfer tubeInfo
- Publication number
- JP3032341B2 JP3032341B2 JP3243126A JP24312691A JP3032341B2 JP 3032341 B2 JP3032341 B2 JP 3032341B2 JP 3243126 A JP3243126 A JP 3243126A JP 24312691 A JP24312691 A JP 24312691A JP 3032341 B2 JP3032341 B2 JP 3032341B2
- Authority
- JP
- Japan
- Prior art keywords
- heat transfer
- transfer tube
- wear
- resistant heat
- hardness
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐摩耗伝熱管の製造方
法に関し、特に流動層ボイラの蒸発管を含む伝熱管の摩
耗による減肉を軽減することのできる耐摩耗伝熱管の製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a wear-resistant heat transfer tube, and more particularly to a method of manufacturing a wear-resistant heat transfer tube capable of reducing wall loss due to wear of a heat transfer tube including an evaporating tube of a fluidized-bed boiler. .
【０００２】[0002]
【従来の技術】一般に、流動層ボイラにおいては、流動
媒体として石灰、珪砂、石炭灰などを用い、この流動媒
体を、炉底部から流入する燃焼用の空気によって流動さ
せるとともに加熱し、その中に微粉炭等の固形燃料を投
入して流動媒体と混合して燃焼させる。伝熱管は流動層
の中に設置されており、流動媒体との間で熱交換が行わ
れるようになっている。このように、流動層ボイラで
は、流動媒体と伝熱管との熱交換が、接触による熱吸収
の形で行われるため、伝熱特性に優れており、小さい伝
熱面積で所定の吸熱効果が得られるという特徴がある。2. Description of the Related Art Generally, in a fluidized-bed boiler, lime, silica sand, coal ash or the like is used as a fluidized medium, and the fluidized medium is heated and heated by air for combustion flowing from a furnace bottom. A solid fuel such as pulverized coal is charged, mixed with a fluid medium, and burned. The heat transfer tube is installed in the fluidized bed, and exchanges heat with the fluidized medium. As described above, in the fluidized-bed boiler, heat exchange between the fluidized medium and the heat transfer tubes is performed in the form of heat absorption by contact, so that the heat transfer characteristics are excellent, and a predetermined heat absorbing effect can be obtained with a small heat transfer area. There is a feature that is.
【０００３】また、流動層内の温度は一般のボイラに比
して低く、７００〜９００℃程度であるので、ＮＯXの
発生が少なく、流動媒体にＣａＯやＭｇＯなどを使用し
た場合には、ＳＯXの発生も抑制されるという特徴があ
る。Further, since the temperature in the fluidized bed is lower than that of a general boiler and is about 700 to 900 ° C., the generation of NO x is small, and when CaO or MgO is used as a fluidized medium, There is a feature that generation of SO X is also suppressed.
【０００４】一方、このような流動層ボイラにおいて
は、伝熱管が流動層の中に設置されているため、伝熱管
の表面は、流動媒体による摩耗を受けやすい。特に、蒸
発管は、管表面の温度が低く、約３００℃程度であるの
で、運転中に流動媒体が直接管表面に衝突するため、摩
耗による減肉が大きく、年間の減肉量が１ｍｍ以上にな
る場合がある。このため、管表面を保護する目的で、例
えば、炭化物やセラミックスなどの耐摩耗性に優れた材
料を管表面に溶射したり、耐摩耗金属材料を管表面に肉
盛溶接したり、あるいは、プロテクタを設けるなどの手
段が従来から提案されている。On the other hand, in such a fluidized-bed boiler, since the heat transfer tubes are provided in the fluidized bed, the surfaces of the heat transfer tubes are susceptible to wear by the fluidized medium. In particular, since the temperature of the evaporating tube is low at approximately 300 ° C., the flowing medium directly collides with the surface of the tube during operation. May be. Therefore, for the purpose of protecting the pipe surface, for example, a material having excellent wear resistance such as carbide or ceramics is sprayed on the pipe surface, a wear-resistant metal material is overlay-welded to the pipe surface, or a protector is used. Means, such as providing, have been conventionally proposed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来技術の耐摩耗策のうち、溶射による被膜は一般にポー
ラスであるので、流動層ボイラにおける如く、粒子の衝
突に対する防護材としては十分ではない。However, among the above-mentioned prior art abrasion resistance measures, the coating formed by thermal spraying is generally porous, so that it is not sufficient as a protective material against particle collision as in a fluidized bed boiler.
【０００６】これに対し、より緻密な被膜を得る手段と
しては、例えば、爆発溶射のような高エネルギガス溶射
による方法があるが、本方法は、一般的なプラズマ溶射
やガス溶射に比べて溶射効率が低く、また、耐摩耗性の
良好な高硬度被膜を得るためには炭化物やセラミックス
等の高価な材料を使用する必要があるので、経済性の面
で問題がある。On the other hand, as a means for obtaining a denser coating, for example, there is a method using high-energy gas spraying such as explosive spraying. However, this method is more effective than general plasma spraying and gas spraying. In order to obtain a high-hardness coating film with low efficiency and good wear resistance, it is necessary to use expensive materials such as carbides and ceramics, which is problematic in terms of economy.
【０００７】一方、肉盛溶接の場合は、溶接施工時の割
れの問題があり、特に、耐摩耗性の良好な高硬度材料の
場合には、割れが発生しやすいという問題がある。On the other hand, in the case of overlay welding, there is a problem of cracking during welding, and in particular, in the case of a high-hardness material having good wear resistance, there is a problem that cracks are easily generated.
【０００８】また、プロテクタの設置は、熱交換効率の
低下を招く等の問題がある。Further, the installation of the protector has a problem that the heat exchange efficiency is lowered.
【０００９】本発明の目的は、上記従来技術における問
題点をなくし、伝熱管の熱交換効率の低下を招くことな
く、耐摩耗性に優れた伝熱管を製造する方法を提供する
ことにある。It is an object of the present invention to provide a method for manufacturing a heat transfer tube having excellent wear resistance without eliminating the above-mentioned problems in the prior art and without reducing the heat exchange efficiency of the heat transfer tube.
【００１０】[0010]
【課題を解決するための手段】上記目的は、伝熱管の表
面に、所定のＣｒ量を含有するＦｅ−Ｃｒ系合金層を設
けた後、水蒸気中で所定の温度で熱処理して、Ｆｅ−Ｃ
ｒ系合金層表面に酸化皮膜を形成することによって達成
される。SUMMARY OF THE INVENTION The object of the present invention is to provide a heat transfer tube having a Fe-Cr-based alloy layer containing a predetermined amount of Cr on the surface thereof and heat-treating the same in steam at a predetermined temperature. C
This is achieved by forming an oxide film on the surface of the r-based alloy layer.
【００１１】[0011]
【作用】伝熱管の表面に、熱衝撃による剥離を生じにく
い、緻密でＣｒが富化した高硬度の酸化被膜が形成され
るので、伝熱管の耐摩耗性が著しく向上する。A dense, Cr-enriched, high-hardness oxide film is formed on the surface of the heat transfer tube, which does not easily peel off due to thermal shock, so that the wear resistance of the heat transfer tube is significantly improved.
【００１２】[0012]
【実施例】図１に、本発明になる耐摩耗伝熱管の一実施
例の断面図を示す。1 is a sectional view showing one embodiment of a wear-resistant heat transfer tube according to the present invention.
【００１３】１は一般に炭素鋼からなる伝熱管の断面で
あり、２は伝熱管１の表面に溶射により形成されたＦｅ
−Ｃｒ系合金層であり、３はＦｅ−Ｃｒ系合金層２の酸
化被膜である。1 is a cross section of a heat transfer tube generally made of carbon steel, and 2 is Fe formed on the surface of the heat transfer tube 1 by thermal spraying.
The reference numeral 3 denotes an oxide film of the Fe—Cr alloy layer 2.
【００１４】図２に、本発明の耐摩耗伝熱管を適用した
一例である流動層ボイラの側面図を示す。FIG. 2 shows a side view of a fluidized-bed boiler as an example to which the wear-resistant heat transfer tube of the present invention is applied.
【００１５】４は石灰、珪砂、石炭灰等の流動媒体及び
微粉炭等の燃料並びに燃焼用の空気からなる流動層であ
り、５は伝熱管のうちで、流動層ボイラの比較的上部に
位置し、比較的高温で、メタル温度（管金属温度）の高
い過熱器であり、６は、同じく伝熱管のうちで、流動層
ボイラの比較的下部に位置し、比較的低温で、メタル温
度の低い蒸発管であり、７は微粉炭等の燃料を流動層ボ
イラに供給する給炭ノズルであり、８は炉底部にあっ
て、流動層ボイラ内に空気を噴出する空気ノズルであ
り、９は外部から供給される空気であり、１０は本発明
の製造方法によって製造した耐摩耗伝熱管である。Reference numeral 4 denotes a fluidized bed composed of a fluidized medium such as lime, silica sand and coal ash, a fuel such as pulverized coal, and air for combustion. Reference numeral 5 denotes a heat transfer tube which is located relatively above the fluidized bed boiler. A superheater having a relatively high temperature and a high metal temperature (pipe metal temperature) is also located at a relatively lower portion of the fluidized bed boiler among the heat transfer tubes, and has a relatively low temperature and a high metal temperature. Reference numeral 7 denotes a coal feed nozzle for supplying fuel such as pulverized coal to the fluidized bed boiler, 8 denotes an air nozzle at the bottom of the furnace, which blows air into the fluidized bed boiler, and 9 denotes a low evaporating pipe. Air supplied from the outside is denoted by 10, which is a wear-resistant heat transfer tube manufactured by the manufacturing method of the present invention.
【００１６】実機において摩耗し易いのは、伝熱管金属
表面の温度が低く、運転中に酸化被膜が充分に形成され
ないので、流動媒体が直接管表面に衝突する蒸発管６で
あるが、特に、給炭ノズル７の直上部分の摩耗が著し
い。そこで、本図に示した実施例においては、本発明の
製造方法によって製造した耐摩耗伝熱管１０は、蒸発管
６のうちの給炭ノズル７の直上部分に設置されている。In the actual machine, the evaporating tube 6 that is liable to wear is the temperature of the metal surface of the heat transfer tube is low and the oxide film is not sufficiently formed during the operation, so that the fluid medium directly collides with the tube surface. The portion immediately above the coal feeding nozzle 7 is significantly worn. Therefore, in the embodiment shown in this figure, the wear-resistant heat transfer tube 10 manufactured by the manufacturing method of the present invention is installed in the evaporating tube 6 immediately above the coal feed nozzle 7.
【００１７】次に、具体的に耐摩耗被膜を形成する方法
を、実験結果に基づく数値を用いて詳細に説明する。Next, a method for forming a wear-resistant coating will be described in detail using numerical values based on experimental results.
【００１８】一般に、流動層ボイラで生ずる摩耗は、流
動媒体の粒子が伝熱管の表面に衝突することによっても
たらされる現象であり、管の材料の硬度を上昇すると耐
摩耗性が向上することが知られている。図３に、発明者
らによって行われた、硬度の異なる材料についての摩耗
試験の結果をを示す。図中の横軸は材料の硬度を、縦軸
は炭素鋼（硬度１５０Ｈｖ）の摩耗量を１とした場合の
各材料の相対摩耗比をそれぞれ示す。実験条件は下記の
とおりであった。Generally, abrasion generated in a fluidized bed boiler is a phenomenon caused by particles of a fluidized medium colliding with the surface of a heat transfer tube. It is known that when the hardness of the tube material is increased, the wear resistance is improved. Have been. FIG. 3 shows the results of a wear test performed on materials having different hardnesses performed by the inventors. In the figure, the horizontal axis represents the hardness of the material, and the vertical axis represents the relative wear ratio of each material when the wear amount of carbon steel (hardness 150 Hv) is set to 1. The experimental conditions were as follows.
【００１９】 衝突粒子：珪砂（平均粒径：約１００μｍ） 衝突速度：２０ｍ／ｓ 試験温度：室温 衝突角度：９０度 時 間：１０時間 図３から、摩耗量は、硬度約３００Ｈｖ以上で低下しは
じめ、硬度約５５０Ｈｖ以上で炭素鋼の約１／２以下に
なることがわかる。実用上は、炭素鋼製伝熱管の寿命を
大幅に向上するためには、摩耗量を炭素鋼の場合の１／
２程度以下とする必要があることから、何らかの方法で
炭素鋼の表面に硬度約５５０Ｈｖ以上の材料層を設けれ
ばよいことになる。Collision particles: silica sand (average particle size: about 100 μm) Collision velocity: 20 m / s Test temperature: room temperature Collision angle: 90 degrees Time: 10 hours From FIG. 3, the wear amount decreases when the hardness is about 300 Hv or more. First, it can be seen that the hardness is about 550 Hv or more and about 1/2 or less of carbon steel. In practice, in order to greatly improve the life of carbon steel heat transfer tubes, the amount of wear should be reduced to 1 /
Since it is necessary to be about 2 or less, a material layer having a hardness of about 550 Hv or more may be provided on the surface of the carbon steel by some method.
【００２０】次に、Ｃｒ含有量と酸化被膜の硬度との関
係を明らかにするために、以下の実験を実施した。ま
ず、０％，３％，９％，１２％及び１８％のＦｅ−Ｃｒ
合金粉末を、それぞれ炭素鋼管の表面にプラズマ溶射
し、厚さ０．１ｍｍの被膜を形成した供試体を作成し
た。次いで、これらの供試体に、温度６５０℃の水蒸気
中で１００時間の熱処理を実施した後、供試体表面に形
成された酸化被膜の硬度を測定した。図４に、これらの
実験結果に基づくＣｒ含有量と酸化被膜の硬度との関係
を示す。図の横軸はＣｒ含有量を、縦軸は硬度をそれぞ
れ示すものであるが、図から、Ｃｒ含有量の増加に伴
い、ほぼ直線的に被膜の硬度が上昇することが分かる。
これは、酸化物（スピネル型のＦｅＣｒ2０4）中のＣｒ
量が増加し、より緻密な被膜が形成されるためであると
考えられる。Next, the following experiment was conducted in order to clarify the relationship between the Cr content and the hardness of the oxide film. First, 0%, 3%, 9%, 12% and 18% of Fe-Cr
Each of the alloy powders was plasma-sprayed on the surface of the carbon steel pipe to form a specimen having a thickness of 0.1 mm. Next, these test pieces were subjected to a heat treatment in steam at a temperature of 650 ° C. for 100 hours, and then the hardness of the oxide film formed on the test piece surface was measured. FIG. 4 shows the relationship between the Cr content and the hardness of the oxide film based on the results of these experiments. The abscissa in the figure shows the Cr content and the ordinate shows the hardness, respectively. From the figure, it can be seen that the hardness of the coating increases almost linearly with an increase in the Cr content.
This, Cr in the oxide (FeCr 2 0 4 spinel)
It is considered that the amount increases and a denser film is formed.
【００２１】本図から、上述のように、摩耗量を硬度１
５０Ｈｖの炭素鋼を使用した場合の１／２程度以下とす
るための硬度、すなわち、約５５０Ｈｖ以上の硬度を有
する酸化被膜を得るためには、５％程度以上のＣｒ含有
量を有する材料を用いる必要があることが分かる。つま
り、伝熱管の表面にＣｒを５％以上含有するＦｅ−Ｃｒ
系合金層を形成させ、更に水蒸気中で熱処理することに
より、伝熱管の表面には硬質の被膜が形成され、耐摩耗
性は著しく向上するようになる。From this figure, as described above, the amount of wear was determined to be 1 hardness.
A material having a Cr content of about 5% or more is used in order to obtain an oxide film having a hardness of about 1/2 or less of the case of using 50 Hv carbon steel, that is, a hardness of about 550 Hv or more. It turns out that it is necessary. That is, Fe-Cr containing 5% or more of Cr on the surface of the heat transfer tube.
By forming a system alloy layer and further performing a heat treatment in steam, a hard coating is formed on the surface of the heat transfer tube, and the wear resistance is significantly improved.
【００２２】一方、Ｃｒ含有量が多くなると、酸化被膜
の厚さが薄くなる傾向が有り、保護被膜としての効果が
期待できなくなるので、Ｃｒ含有量の上限は２０％程度
とする必要がある。On the other hand, when the Cr content increases, the thickness of the oxide film tends to decrease, and the effect as a protective film cannot be expected. Therefore, the upper limit of the Cr content needs to be about 20%.
【００２３】酸化被膜は大気中あるいは、燃焼ガス中で
も形成されるが、これらの中では水蒸気中に比べて被膜
形成速度がおそく、必要な膜厚を有する酸化被膜を形成
することは困難であるので、加熱雰囲気は水蒸気とする
必要がある。The oxide film is formed in the atmosphere or even in the combustion gas. In these, the film formation speed is lower than in water vapor, and it is difficult to form an oxide film having a required film thickness. The heating atmosphere must be steam.
【００２４】加熱温度と時間については、加熱温度は高
いほど、また、時間は長いほど、酸化被膜は多く形成さ
れる。しかし、温度をあまり高くすると、伝熱管材料
（通常は炭素鋼）の劣化を引き起こすので、５００〜８
００℃とするのが望ましい。As for the heating temperature and time, the higher the heating temperature and the longer the time, the more the oxide film is formed. However, if the temperature is too high, the heat transfer tube material (usually carbon steel) is deteriorated.
Preferably, the temperature is set to 00 ° C.
【００２５】加熱時間としては、一例として、Ｃｒ含有
量９％のＦｅ−Ｃｒ系合金を用いた場合に、６５０℃で
約１００時間加熱したところ、実用上充分な約５０μｍ
の酸化被膜が得られたので、１００時間程度がよい。As an example of the heating time, when a Fe—Cr alloy having a Cr content of 9% is used and heated at 650 ° C. for about 100 hours, a practically sufficient about 50 μm
About 100 hours is preferable since an oxide film of the above was obtained.
【００２６】また、上記の方法によって得た酸化被膜
は、実機の運転中の温度（３００〜６００℃）の範囲で
は、剥離も生じないことを確認した。Further, it was confirmed that the oxide film obtained by the above method did not peel off in the temperature range (300 to 600 ° C.) during the operation of the actual machine.
【００２７】以上、本発明を実施例に基づいて具体的に
説明したが、本発明は上記実施例に限定されるされるも
のではなく、その要旨を逸脱しない範囲において種々変
更可能であることは勿論である。例えば、上記実施例で
は、本発明の製造方法によって製造した耐摩耗熱伝熱管
１０は、蒸発管６のうちの給炭ノズル７の直上部分にの
み設置したが、蒸発管６の他の部分または過熱器５に用
いてもよい。また、図１に示した実施例では、Ｆｅ−Ｃ
ｒ系合金層の溶射範囲を伝熱管の全周としているが、一
般に摩耗が著しいのは、流動媒体が衝突する伝熱管の下
面であるので、下面のみに溶射してもよい。更に、上記
実施例では、溶射によってＦｅ−Ｃｒ系合金層を形成し
ているが、溶射の代りに、肉盛溶接や二重管としてもよ
い。Although the present invention has been described in detail with reference to the embodiments, the present invention is not limited to the above-described embodiments, and may be variously modified without departing from the gist thereof. Of course. For example, in the above embodiment, the wear-resistant heat transfer tube 10 manufactured by the manufacturing method of the present invention is installed only on the portion of the evaporating tube 6 directly above the coal supply nozzle 7, but other portions of the evaporating tube 6 or It may be used for the superheater 5. Further, in the embodiment shown in FIG.
Although the thermal spraying range of the r-based alloy layer is set to the entire circumference of the heat transfer tube, generally, the wear is remarkable on the lower surface of the heat transfer tube where the fluid medium collides. Further, in the above embodiment, the Fe-Cr-based alloy layer is formed by thermal spraying, but instead of thermal spraying, overlay welding or a double pipe may be used.
【００２８】[0028]
【発明の効果】本発明によれば、伝熱管の表面に、緻密
でＣｒが富化した高硬度の酸化被膜を容易に形成できる
ので、経済的で、割れの発生が少なく、かつ熱交換効率
の低下を招くことのない、耐摩耗性に優れた伝熱管を製
造することができる。According to the present invention, a dense, Cr-enriched oxide film of high hardness can be easily formed on the surface of the heat transfer tube, so that it is economical, has less cracks, and has a high heat exchange efficiency. It is possible to manufacture a heat transfer tube excellent in abrasion resistance without causing a decrease in the heat transfer tube.
【図１】本発明の一実施例を示す、耐摩耗伝熱管の断面
図である。FIG. 1 is a cross-sectional view of a wear-resistant heat transfer tube, showing one embodiment of the present invention.
【図２】本発明の耐摩耗伝熱管を適用した一例を示す、
流動層ボイラの側面図である。FIG. 2 shows an example in which the wear-resistant heat transfer tube of the present invention is applied.
It is a side view of a fluidized-bed boiler.
【図３】材料の硬度と摩耗量との関係を示す図である。FIG. 3 is a diagram showing the relationship between the hardness of a material and the amount of wear.
【図４】材料のＣｒ含有量と、水蒸気中で生成した酸化
被膜の硬度との関係を示す図である。FIG. 4 is a graph showing the relationship between the Cr content of a material and the hardness of an oxide film formed in water vapor.
１…伝熱管、２…Ｆｅ−Ｃｒ系合金層、３…Ｆｅ−Ｃｒ
系合金層の酸化被膜、４…流動層、５…過熱器、６…蒸
発管、７…給炭ノズル、８…空気ノズル、９…空気、１
０…本発明の耐摩耗伝熱管。DESCRIPTION OF SYMBOLS 1 ... Heat transfer tube, 2 ... Fe-Cr alloy layer, 3 ... Fe-Cr
Oxide film of system alloy layer, 4 fluidized bed, 5 superheater, 6 evaporation tube, 7 coal feed nozzle, 8 air nozzle, 9 air, 1
0: Wear-resistant heat transfer tube of the present invention.
Claims (6)
けた後、水蒸気中で加熱して表面に硬質の酸化被膜を形
成することを特徴とする耐摩耗伝熱管の製造方法。1. A method for producing a wear-resistant heat transfer tube, comprising: providing an Fe—Cr alloy layer on the outer surface of the heat transfer tube and heating the tube in steam to form a hard oxide film on the surface.
％以上２０％以下とすることを特徴とする請求項１記載
の耐摩耗伝熱管の製造方法。2. The method according to claim 1, wherein the Fe content of the Fe—Cr alloy layer is 5%.
The method for producing a wear-resistant heat transfer tube according to claim 1, wherein the content is not less than 20% and not more than 20%.
００μｍとすることを特徴とする請求項１記載の耐摩耗
伝熱管の製造方法。3. The thickness of the Fe—Cr alloy layer is 50 to 1
The method for producing a wear-resistant heat transfer tube according to claim 1, wherein the thickness is set to 00 µm.
接または二重管により形成することを特徴とする請求項
１記載の耐摩耗伝熱管の製造方法。4. The method for manufacturing a wear-resistant heat transfer tube according to claim 1, wherein said Fe-Cr alloy layer is formed by thermal spraying, overlay welding, or a double tube.
００℃とすることを特徴とする請求項１記載の耐摩耗伝
熱管の製造方法。5. The heating temperature in the steam is 500-8.
The method for producing a wear-resistant heat transfer tube according to claim 1, wherein the temperature is set to 00 ° C.
間とすることを特徴とする請求項１記載の耐摩耗伝熱管
の製造方法。6. The method according to claim 1, wherein the heating time in said steam is about 100 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3243126A JP3032341B2 (en) | 1991-09-24 | 1991-09-24 | Manufacturing method of wear-resistant heat transfer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3243126A JP3032341B2 (en) | 1991-09-24 | 1991-09-24 | Manufacturing method of wear-resistant heat transfer tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0681120A JPH0681120A (en) | 1994-03-22 |
| JP3032341B2 true JP3032341B2 (en) | 2000-04-17 |
Family
ID=17099192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3243126A Expired - Lifetime JP3032341B2 (en) | 1991-09-24 | 1991-09-24 | Manufacturing method of wear-resistant heat transfer tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3032341B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319432A (en) * | 2019-04-30 | 2019-10-11 | 舟山旺能环保能源有限公司 | Corrosion resistant waste incinerator superheater and manufacturing method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3784715B2 (en) | 2001-12-26 | 2006-06-14 | シャープ株式会社 | Feed horn structure, manufacturing method thereof, converter and antenna for satellite communication reception |
| US8037928B2 (en) * | 2005-12-21 | 2011-10-18 | Exxonmobil Research & Engineering Company | Chromium-enriched oxide containing material and preoxidation method of making the same to mitigate corrosion and fouling associated with heat transfer components |
| JP6016742B2 (en) * | 2013-09-12 | 2016-10-26 | 三菱重工業株式会社 | Method and apparatus for selecting material for sprayed film or overlay weld layer |
-
1991
- 1991-09-24 JP JP3243126A patent/JP3032341B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319432A (en) * | 2019-04-30 | 2019-10-11 | 舟山旺能环保能源有限公司 | Corrosion resistant waste incinerator superheater and manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0681120A (en) | 1994-03-22 |
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