JPH07258781A - Heat exchanger tube material of waste heat boiler utilizing waste gas from garbage incineration excellent in high-temperature corrosion resistance and high-temperature strength - Google Patents
Heat exchanger tube material of waste heat boiler utilizing waste gas from garbage incineration excellent in high-temperature corrosion resistance and high-temperature strengthInfo
- Publication number
- JPH07258781A JPH07258781A JP7659394A JP7659394A JPH07258781A JP H07258781 A JPH07258781 A JP H07258781A JP 7659394 A JP7659394 A JP 7659394A JP 7659394 A JP7659394 A JP 7659394A JP H07258781 A JPH07258781 A JP H07258781A
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- Japan
- Prior art keywords
- less
- corrosion resistance
- tube material
- heat transfer
- high temperature
- 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.)
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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、腐食性が強く、かつ
高温のごみ焼却排ガスに対して、すぐれた高温耐食性を
示し、加えてすぐれた高温強度を有するごみ焼却排ガス
利用廃熱ボイラの伝熱管材に関するものである。BACKGROUND OF THE INVENTION The present invention relates to the transmission of a waste heat boiler using waste incineration exhaust gas, which is highly corrosive and has excellent high-temperature corrosion resistance against high-temperature waste incineration exhaust gas, and also has excellent high-temperature strength. It relates to heat pipe materials.
【０００２】[0002]
【従来の技術】一般に、ごみ焼却施設には排ガスのもつ
高温潜熱を利用する目的で、廃熱ボイラが設置されてい
る。また、前記廃熱ボイラの構造部材である伝熱管材
は、腐食性の強いＨＣｌやＳＯ2 ガス、Ｎａ2 ＳＯ4 な
どの溶融硫酸塩、さらにＮａＣｌやＫＣｌなどの溶融塩
化物などの腐食性生成物を含有する高温の排ガスにさら
され、かつ前記硫酸塩や塩化物などが表面に堆積した環
境下におかれることから、その製造には高温耐食性のす
ぐれた各種の材料が用いられている。2. Description of the Related Art Generally, a waste heat boiler is installed in a refuse incineration facility in order to utilize high temperature latent heat of exhaust gas. Further, the heat transfer tube material, which is a structural member of the waste heat boiler, is a corrosive agent such as HCl or SO 2 gas having a strong corrosive property, molten sulfate such as Na 2 SO 4 or molten chloride such as NaCl or KCl. Since it is exposed to a high-temperature exhaust gas containing a substance and is placed in an environment where the above-mentioned sulfates and chlorides are deposited on the surface, various materials having excellent high-temperature corrosion resistance are used for its production.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の切迫した
エネルギー事情から、ごみ焼却による廃熱を最大限に利
用するために廃熱ボイラの蒸気条件を高温高圧化する傾
向にあり、これに伴ない伝熱管の管壁温度はさらに上昇
し、かつごみの高カロリー化およびプラスチックの増加
により排ガスの腐食性も一段と激しさを増す傾向にあ
り、かかる点から廃熱ボイラの伝熱管材には、より一層
の高温耐食性が要求され、さらに伝熱効率向上の点から
管材の薄肉化を可能にする高温強度が強く要求されてい
るが、上記の従来伝熱管材は、高温耐食性および高温強
度の点で未だ不十分なため、これらの要求には満足に対
応することができないのが現状である。On the other hand, due to the recent urgent energy situation, there is a tendency to increase the steam condition of the waste heat boiler to a high temperature and high pressure in order to make maximum use of the waste heat from incineration. The wall temperature of the heat transfer tube further rises, and the corrosiveness of the exhaust gas tends to become more violent due to the high calorie content of waste and the increase of plastics.From this point, the heat transfer tube material of the waste heat boiler is Further high temperature corrosion resistance is required, and further, high temperature strength that enables thinning of the pipe material is strongly required from the viewpoint of improving heat transfer efficiency.However, the conventional heat transfer pipe materials described above are high in corrosion resistance and high temperature strength. At present, it is not possible to satisfy these requirements satisfactorily because they are still insufficient.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、より一段とすぐれた高温耐食性
および高温強度を有するごみ焼却排ガス利用廃熱ボイラ
の伝熱管材を開発すべく研究を行なった結果、上記伝熱
管材を、重量％で（以下、％は重量％を示す）、Ｃｒ：
２０〜２５％、 Ｍｏ：１８〜２５％、Ｎｂ：０．
５〜５％、 Ｆｅ：０．０１〜７％、Ｃ：０．０５
％以下、 Ｓｉ：０．１％以下、Ｐ：０．０３％以
下、 Ｓ：０．０３％以下、を含有し、さらに必要
に応じて、（ａ） Ｗ：０．１〜２％、（ｂ） 希土類
元素：０．００１〜０．１％、Ｙ：０．００ｌ〜０．１
％、Ｚｒ：０．００１〜０．１％、Ｈｆ：０．００１〜
０．０１％、Ｂ：０．００１〜０．０１％、のうちの１
種または２種以上、以上（ａ）および／または（ｂ）を
含有し、残りがＮｉとその他の不純物からなる組成を有
するＮｉ基合金で構成すると、この結果のＮｉ基合金製
伝熱管材は、きわめて苛酷な高温腐食環境下ですぐれた
耐食性を示すばかりでなく、高い高温強度を有するので
薄肉化が可能となり、伝熱効率の向上をはかることがで
きるという研究結果を得たのである。Therefore, the present inventors have
From the above viewpoints, as a result of conducting research to develop a heat transfer tube material for a waste heat boiler using waste incineration exhaust gas, which has further excellent high temperature corrosion resistance and high temperature strength, the above heat transfer tube material is expressed in weight% ( ,% Indicates weight%), Cr:
20-25%, Mo: 18-25%, Nb: 0.
5 to 5%, Fe: 0.01 to 7%, C: 0.05
% Or less, Si: 0.1% or less, P: 0.03% or less, S: 0.03% or less, and, if necessary, (a) W: 0.1 to 2%, ( b) Rare earth element: 0.001 to 0.1%, Y: 0.001 to 0.1
%, Zr: 0.001-0.1%, Hf: 0.001-
0.01%, B: 0.001-0.01%, one of
When it is composed of a Ni-based alloy containing one or more kinds, the above (a) and / or (b), and the rest having a composition of Ni and other impurities, the resulting Ni-based alloy heat transfer tube material is The research results show that not only does it show excellent corrosion resistance under extremely severe high temperature corrosive environments, but it also has high high temperature strength, so that it is possible to reduce the thickness and improve the heat transfer efficiency.
【０００５】この発明は、上記の研究結果にもとづいて
なされたものであって、以下に伝熱管材を構成するＮｉ
基合金の成分組成を上記の通りに限定した理由を説明す
る。 （ａ） ＣｒおよびＭｏ これらの成分には、共存した状態で高温のごみ焼却排ガ
スに対する高温耐食性および高温耐酸化性を向上させる
と共に、高温強度を向上させる作用があるが、その含有
量がＣｒおよびＭｏのいずれかでもＣｒ：２０％未満お
よびＭｏ：１８％未満になると前記作用に所望の効果が
得られず、一方その含有量が同じくＣｒおよびＭｏのい
ずれかでもＣｒ：２５％およびＭｏ：２５％を越えると
熱間加工性が低下するようになることから、その含有量
を、Ｃｒ：２０〜２５％、望ましくは２０〜２３％、Ｍ
ｏ：１８〜２５％、望ましくは１８〜２１％と定めた。The present invention was made based on the above-mentioned research results, and the Ni constituting the heat transfer tube material will be described below.
The reason why the component composition of the base alloy is limited as described above will be described. (A) Cr and Mo These components have a function of improving high-temperature corrosion resistance and high-temperature oxidation resistance to high-temperature waste incineration exhaust gas in a coexisting state and improving high-temperature strength. If the content of Cr is less than 20% and the content of Mo is less than 18%, the desired effect cannot be obtained, while the content of Cr is either 25% or 25:25. %, The hot workability will be deteriorated. Therefore, the content of Cr: 20 to 25%, preferably 20 to 23%, M
o: 18 to 25%, preferably 18 to 21%.
【０００６】（ｂ） Ｎｂ Ｎｂ成分には、高温排ガス中の腐食性生成物である硫酸
塩や塩化物などに対する耐食性を向上させる作用がある
が、その含有量が０．５％未満では前記の高温耐食性に
所望の向上効果が得られず、一方その含有量が５％を越
えると熱間加工性が低下するようになることから、その
含有量を０．５〜５％、望ましくは０．５〜２％と定め
た。(B) Nb The Nb component has the function of improving the corrosion resistance to the corrosive products such as sulfates and chlorides in the high temperature exhaust gas, but if the content is less than 0.5%, Since the desired effect of improving the high temperature corrosion resistance cannot be obtained, and when the content exceeds 5%, the hot workability is deteriorated. Therefore, the content is 0.5 to 5%, preferably 0. It was set at 5 to 2%.
【０００７】（ｃ） Ｆｅ Ｆｅ成分には熱間加工性を向上させる作用があるが、そ
の含有量が０．０１％未満では所望の熱間加工性を確保
することができず、一方その含有量が７％を越えると靭
性が低下するようになることから、その含有量を０．０
１〜７％、望ましくは０．５〜５％と定めた。(C) Fe Fe component has an action of improving hot workability, but if the content of Fe is less than 0.01%, the desired hot workability cannot be ensured. If the amount exceeds 7%, the toughness will decrease, so the content should be 0.0
It was set to 1 to 7%, preferably 0.5 to 5%.
【０００８】（ｄ） Ｃ 不純物としてのＣ成分の含有量が０．０５％を越える
と、粒界に存在する炭化物の量が増大するようになっ
て、特に高温排ガス中に含有する溶融塩化物による粒界
腐食の進行が促進されるようになることから、その含有
量を０．０５％以下と定めた。(D) When the content of the C component as the C impurity exceeds 0.05%, the amount of carbides existing at the grain boundaries is increased, especially the molten chloride contained in the high temperature exhaust gas. Since the progress of intergranular corrosion due to the above is promoted, the content thereof is set to 0.05% or less.
【０００９】（ｅ） Ｓｉ Ｓｉ成分には脱酸作用があるので、溶湯の脱酸に用いる
場合があるが、この場合でもその含有量が０．１％を越
えると靭性が低下するようになることから、その含有量
を０．１％以下と定めた。(E) Si Since the Si component has a deoxidizing action, it may be used for deoxidizing a molten metal, but even in this case, if the content exceeds 0.1%, the toughness deteriorates. Therefore, the content is determined to be 0.1% or less.
【００１０】（ｆ） ＰおよびＳ 不純物としてのこれらの成分がそれぞれＰ：０．０３％
およびＳ：０．０３％を越えると、粒界に偏析するよう
になって熱間加工性を低下させ、かつ高温耐食性も低下
するようになることから、その含有量をＰ：０．０３％
以下およびＳ：０．０３％以下と定めた。(F) P and S: P and 0.03% of these components as impurities, respectively.
And, if S: 0.03% is exceeded, segregation occurs at the grain boundaries, which deteriorates hot workability and also decreases high temperature corrosion resistance. Therefore, the content of P: 0.03%
Below and S: 0.03% or less.
【００１１】（ｇ） Ｗ Ｗ成分には、より一段と高温耐食性を向上させる作用が
あるので必要に応じて含有されるが、その含有量が０．
１％未満では前記作用に所望の向上効果が得られず、一
方その含有量が２％を越えると熱間加工性が低下するよ
うになることから、その含有量を０．１〜２％、望まし
くは０．５〜１．５％と定めた。(G) The W W component has a function of further improving the high temperature corrosion resistance, and thus it is contained as necessary, but the content thereof is 0.
If it is less than 1%, the desired improving effect on the above-mentioned action cannot be obtained. On the other hand, if its content exceeds 2%, the hot workability tends to decrease, so that the content is 0.1 to 2%. It is preferably set to 0.5 to 1.5%.
【００１２】（ｈ） 希土類元素、Ｙ，Ｚｒ，Ｈｆ、お
よびＢ これらの成分には、熱間加工性を向上させる作用がある
ので必要に応じて含有させるが、その含有量が、いずれ
かの成分も０．００１％未満では所望の熱間加工性向上
効果が得られず、一方その含有量が、希土類元素、Ｙ、
およびＺｒにあっては０．１％、ＨｆおよびＢにあって
は０．０１％を越えても熱間加工性により一層の向上効
果が得られないことから、その含有量を、希土類元素：
０．００１〜０．１％、Ｙ：０．００１〜０．１％、Ｚ
ｒ：０．００１〜０．１％、Ｈｆ：０．００１〜０．０
１％、およびＢ：０．００１〜０．０１％と定めた。(H) Rare earth element, Y, Zr, Hf, and B These components have an action of improving hot workability, so they are contained as necessary. If the content of the component is also less than 0.001%, the desired hot workability improving effect cannot be obtained, while the content is a rare earth element, Y,
Further, even if it exceeds 0.1% for Zr and 0.01% for Hf and B, no further improvement effect can be obtained due to the hot workability.
0.001-0.1%, Y: 0.001-0.1%, Z
r: 0.001-0.1%, Hf: 0.001-0.0
1%, and B: 0.001-0.01%.
【００１３】（ｉ） その他不純物 その他不純物としてＭｎ，Ｔｉ、およびＡｌを含有する
場合があるが、これらの成分の含有量がそれぞれ０．４
％を越えると熱間加工性が損なわれるようになることか
ら、その含有量をそれぞれ０．４％以下にとどめなけれ
ばならない。(I) Other Impurities Mn, Ti, and Al may be contained as other impurities, but the content of each of these components is 0.4.
%, The hot workability will be impaired, so the content of each must be kept to 0.4% or less.
【００１４】[0014]
【実施例】つぎに、この発明の伝熱管材を実施例により
具体的に説明する。通常の高周波溶解炉を用いて、表１
〜３に示される成分組成をもったＮｉ基合金溶湯を調製
し、インゴットに鋳造し、このインゴットに１０００〜
１２５０℃の範囲内の所定温度で熱間鍛造を施して直
径：４０mmの丸棒材とし、ついでこの丸棒材から直径：
３８mm×肉厚：５mmの寸法に削り出すことにより本発明
伝熱管材１〜２６および比較伝熱管材１〜４をそれぞれ
製造した。なお、比較伝熱管材１〜４は、これを構成す
るＮｉ基合金の構成成分のうち、高温耐食性および高温
強度に影響を及ぼす成分のいずれかの成分含有量（表３
には※印を付す）がこの発明の範囲から外れたものであ
る。EXAMPLES Next, the heat transfer tube material of the present invention will be specifically described by way of examples. Using a normal high frequency melting furnace, Table 1
~ 3 to prepare a Ni-based alloy melt having the composition of the composition, cast into an ingot, 1000 ~
Hot forging is performed at a predetermined temperature within the range of 1250 ° C. to make a round bar with a diameter of 40 mm, and then the diameter of this round bar is:
38 mm x wall thickness: The heat transfer tube materials 1 to 26 of the present invention and the comparative heat transfer tube materials 1 to 4 were manufactured by cutting into a size of 5 mm. In addition, in the comparative heat transfer tube materials 1 to 4, among the constituent components of the Ni-based alloy constituting the comparative heat transfer tube materials, any one of the components that affect the high temperature corrosion resistance and the high temperature strength (Table 3
Are marked with *) are outside the scope of this invention.
【００１５】ついで、この結果得られた各種の伝熱管材
を廃熱ボイラに組み込み、この廃熱ボイラを処理能力：
２００ton ／日のごみ焼却施設に設置し、前記伝熱管材
の表面温度：５００℃、排ガス温度：６５０℃の条件で
１０００時間の操業を行ない、操業終了後伝熱管材を取
り出し、表面に付着した灰分や生成スケールを除去した
状態で周方向における肉厚を測定し、最大減肉量を求め
ると共に、表面部の断面ミクロ組織を観察し、最大粒界
腐食長さを測定し、さらに高温強度を評価する目的で、
上記の熱間鍛造丸棒材から高温引張試験用試片を削り出
し、この試片を用い、５００℃で引張強さを測定した。Next, various heat transfer tube materials obtained as a result are incorporated into a waste heat boiler, and the waste heat boiler has a treatment capacity:
Installed in a refuse incineration facility of 200 tons / day, operated for 1000 hours under the conditions of the surface temperature of the heat transfer tube: 500 ° C and the exhaust gas temperature: 650 ° C, and after the operation was completed, the heat transfer tube was taken out and adhered to the surface. Measure the wall thickness in the circumferential direction with ash and scale removed to determine the maximum amount of wall thinning, observe the cross-sectional microstructure of the surface, measure the maximum intergranular corrosion length, and measure the high temperature strength. For evaluation purposes,
A sample for high temperature tensile test was cut out from the above-mentioned hot forged round bar material, and the tensile strength was measured at 500 ° C using this sample.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【表３】 [Table 3]
【００１９】[0019]
【表４】 [Table 4]
【００２０】[0020]
【表５】 [Table 5]
【発明の効果】表１〜５に示される結果から、本発明伝
熱管材１〜２６は、いずれも高温のごみ焼却排ガス雰囲
気においてすぐれた高温耐食性を示し、かつすぐれた高
温強度を有し、一方比較伝熱管材１〜４に見られるよう
に、これを構成するＮｉ基合金のうちのＣｒ，Ｍｏ、お
よびＮｂのいずれかの含有量でもこの発明の範囲から外
れて低くなると少なくとも高温耐食性および高温強度の
いずれかの特性が劣ったものになることが明らかであ
る。上述のように、この発明の伝熱管材は、一段とすぐ
れた高温耐食性を有するので、ごみ焼却による廃熱を有
効に利用するための廃熱ボイラの蒸気条件の高温・高圧
化に対応することができ、さらにすぐれた高温強度を有
するので、薄肉化を可能とすることから、伝熱効率の向
上にも寄与するなど工業上有用な特性を有するのであ
る。From the results shown in Tables 1 to 5, the heat transfer tube materials 1 to 26 of the present invention all show excellent high temperature corrosion resistance in a high temperature refuse incineration exhaust gas atmosphere, and have excellent high temperature strength, On the other hand, as seen in the comparative heat transfer tube materials 1 to 4, if the content of any one of Cr, Mo, and Nb in the Ni-based alloy constituting the heat transfer tube material falls outside the range of the present invention, at least high temperature corrosion resistance and It is clear that either property of high temperature strength will be inferior. As described above, since the heat transfer tube material of the present invention has further excellent high temperature corrosion resistance, it is possible to cope with high temperature and high pressure steam conditions of the waste heat boiler for effectively utilizing waste heat from waste incineration. Since it can be formed and has excellent high temperature strength, it can be thinned, and thus has industrially useful characteristics such as contributing to improvement of heat transfer efficiency.
Claims (4)
有し、残りがＮｉとその他の不純物からなる組成を有す
るＮｉ基合金で構成したことを特徴とする高温耐食性お
よび高温強度のすぐれたごみ焼却排ガス利用廃熱ボイラ
の伝熱管材。1. By weight%, Cr: 20-25%, Mo: 18-25%, Nb: 0.5-5%, Fe: 0.01-7%, C: 0.05% or less, Si : 0.1% or less, P: 0.03% or less, S: 0.03% or less, and the balance being a Ni-based alloy having a composition of Ni and other impurities. A heat transfer tube material for a waste heat boiler using waste incineration exhaust gas, which has excellent high-temperature corrosion resistance and high-temperature strength.
有し、さらに、 Ｗ ：０．１〜２％、を含有し、残りがＮｉとその他の
不純物からなる組成を有するＮｉ基合金で構成したこと
を特徴とする高温耐食性および高温強度のすぐれたごみ
焼却排ガス利用廃熱ボイラの伝熱管材。2. By weight%, Cr: 20-25%, Mo: 18-25%, Nb: 0.5-5%, Fe: 0.01-7%, C: 0.05% or less, Si : 0.1% or less, P: 0.03% or less, S: 0.03% or less, and further W: 0.1 to 2%, and the rest from Ni and other impurities. A heat transfer tube material for a waste heat boiler using waste incineration exhaust gas, which is excellent in high-temperature corrosion resistance and high-temperature strength, and is composed of a Ni-based alloy having the following composition.
有し、さらに、 希土類元素：０．００１〜０．１％、Ｙ：０．００１〜
０．１％、 Ｚｒ：０．００１〜０．１％、 Ｈｆ：０．００
１〜０．０１％、 Ｂ：０．００１〜０．０１％、のうちの１種または２種
以上、を含有し、残りがＮｉとその他の不純物からなる
組成を有するＮｉ基合金で構成したことを特徴とする高
温耐食性および高温強度のすぐれたごみ焼却排ガス利用
廃熱ボイラの伝熱管材。3. By weight%, Cr: 20-25%, Mo: 18-25%, Nb: 0.5-5%, Fe: 0.01-7%, C: 0.05% or less, Si : 0.1% or less, P: 0.03% or less, S: 0.03% or less, and further, rare earth element: 0.001 to 0.1%, Y: 0.001 to
0.1%, Zr: 0.001 to 0.1%, Hf: 0.00
1 to 0.01%, B: 0.001 to 0.01%, and one or more of them, and the balance is composed of a Ni-based alloy having a composition of Ni and other impurities. A heat transfer tube material for a waste heat boiler using waste incineration exhaust gas, which is characterized by high temperature corrosion resistance and high temperature strength.
有し、 Ｗ ：０．１〜２％、を含有し、さらに、 希土類元素：０．００１〜０．１％、Ｙ：０．００１〜
０．１％、 Ｚｒ：０．００１〜０．１％、Ｈｆ：０．００１〜０．
０１％、 Ｂ：０．００１〜０．０１％、のうちの１種または２種
以上、を含有し、残りがＮｉとその他の不純物からなる
組成を有するＮｉ基合金で構成したことを特徴とする高
温耐食性および高温強度のすぐれたごみ焼却排ガス利用
廃熱ボイラの伝熱管材。4. By weight%, Cr: 20-25%, Mo: 18-25%, Nb: 0.5-5%, Fe: 0.01-7%, C: 0.05% or less, Si : 0.1% or less, P: 0.03% or less, S: 0.03% or less, W: 0.1-2%, further, rare earth element: 0.001-0 0.1%, Y: 0.001
0.1%, Zr: 0.001 to 0.1%, Hf: 0.001 to 0.
01%, B: 0.001 to 0.01%, one or more of them, and the balance is composed of a Ni-based alloy having a composition of Ni and other impurities. A heat transfer tube material for a waste heat boiler using waste incineration exhaust gas, which has excellent high temperature corrosion resistance and high temperature strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7659394A JPH07258781A (en) | 1994-03-23 | 1994-03-23 | Heat exchanger tube material of waste heat boiler utilizing waste gas from garbage incineration excellent in high-temperature corrosion resistance and high-temperature strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7659394A JPH07258781A (en) | 1994-03-23 | 1994-03-23 | Heat exchanger tube material of waste heat boiler utilizing waste gas from garbage incineration excellent in high-temperature corrosion resistance and high-temperature strength |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07258781A true JPH07258781A (en) | 1995-10-09 |
Family
ID=13609616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7659394A Pending JPH07258781A (en) | 1994-03-23 | 1994-03-23 | Heat exchanger tube material of waste heat boiler utilizing waste gas from garbage incineration excellent in high-temperature corrosion resistance and high-temperature strength |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07258781A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015058496A (en) * | 2013-09-18 | 2015-03-30 | 川崎重工業株式会社 | Method of manufacturing corrosion-resistant member, and boiler |
-
1994
- 1994-03-23 JP JP7659394A patent/JPH07258781A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015058496A (en) * | 2013-09-18 | 2015-03-30 | 川崎重工業株式会社 | Method of manufacturing corrosion-resistant member, and boiler |
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