JPH09194973A - Sulfuric acid corrosion resistant material - Google Patents
Sulfuric acid corrosion resistant materialInfo
- Publication number
- JPH09194973A JPH09194973A JP1822296A JP1822296A JPH09194973A JP H09194973 A JPH09194973 A JP H09194973A JP 1822296 A JP1822296 A JP 1822296A JP 1822296 A JP1822296 A JP 1822296A JP H09194973 A JPH09194973 A JP H09194973A
- Authority
- JP
- Japan
- Prior art keywords
- sulfuric acid
- resistant material
- corrosion resistant
- important element
- 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.)
- Withdrawn
Links
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- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は耐硫酸腐食性材料に
関し、特に湿式排煙脱硫装置において使用する脱硫ファ
ン用耐食材料として有利に適用しうる同材料に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sulfuric acid corrosion resistant material, and more particularly to the material which can be advantageously applied as a corrosion resistant material for desulfurization fans used in a wet flue gas desulfurization apparatus.
【０００２】[0002]
【従来の技術】ボイラの燃料である重油及び石炭中には
約３０％以下の無機物質が存在し、これらは燃焼によっ
て分解・蒸発する。この際、排ガスとしてＳＯ2 ，ＣＯ
2 ，ＣＯ，Ｏ，Ｈ2 Ｏ，ＮＯx 等が発生するが、このう
ちＳＯ2 とＨ2 Ｏは１００℃前後の低温において反応し
て硫酸を生成する。この硫酸は濃度が最大４０〜５０％
に達し、腐食性が非常に激しいために脱硫ファン材料と
して使用されているＮｉ基の２０％Ｃｒ−６％Ｍｏ−Ｎ
ｉ（Ｂａｌ．）材が孔食を発生する。そのため、孔食が
発生する部分には耐硫酸用塗料を塗布しているが多大な
時間と経費を要している。2. Description of the Related Art Heavy oil and coal, which are fuels for boilers, contain about 30% or less of inorganic substances, which are decomposed and evaporated by combustion. At this time, as exhaust gas, SO 2 , CO
2 , CO, O, H 2 O, NO x, etc. are generated, but among these, SO 2 and H 2 O react at a low temperature of about 100 ° C. to generate sulfuric acid. This sulfuric acid has a maximum concentration of 40-50%
20% Cr-6% Mo-N based on Ni used as desulfurization fan material due to its extremely high corrosiveness.
The i (Bal.) material causes pitting corrosion. Therefore, the sulfuric acid resistant coating is applied to the portion where pitting corrosion occurs, but it takes a lot of time and cost.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記技術水準
に鑑み、耐硫酸腐食性材料、特に湿式排煙脱硫装置の脱
硫ファン用の耐硫酸腐食性材料を提供しようとするもの
である。In view of the above-mentioned state of the art, the present invention aims to provide a sulfuric acid corrosion resistant material, particularly a sulfuric acid corrosion resistant material for a desulfurization fan of a wet flue gas desulfurization apparatus.
【０００４】[0004]
【課題を解決するための手段】本発明は（１）主として
重量％で、Ｃｒ：１５〜３０，Ｍｏ：３〜１０，Ｃｕ：
１〜３，残部：Ｎｉからなることを特徴とする耐硫酸腐
食性材料及び（２）上記（１）記載の耐硫酸腐食性材料
からなることを特徴とする脱硫ファン用耐食材料であ
る。According to the present invention, (1) mainly in% by weight, Cr: 15-30, Mo: 3-10, Cu:
1 to 3, balance: Ni, sulfuric acid corrosion resistant material, and (2) sulfuric acid corrosion resistant material as described in (1) above, desulfurization fan corrosion resistant material.
【０００５】[0005]
【発明の実施の態様】以下、本発明の耐硫酸腐食性材料
の元素設定理由を説明する。BEST MODE FOR CARRYING OUT THE INVENTION The reasons for setting elements of the sulfuric acid corrosion resistant material of the present invention will be described below.
【０００６】Ｃｒ： Ｃｒは酸化皮膜を構成するのに重
要な元素であり、最低１５ｗｔ％必要である。しかし、
３０ｗｔ％を越えて含有されるとσ相等が形成し脆くな
るのでその上限を３０ｗｔ％とした。Cr: Cr is an important element for forming an oxide film and is required to be at least 15 wt%. But,
If the content exceeds 30 wt%, a σ phase and the like form and become brittle, so the upper limit was made 30 wt%.
【０００７】Ｍｏ： Ｍｏは塩化物に対する応力腐食割
れ、孔食を防止するのに重要な元素であり、その防止に
は３ｗｔ％以上が必要である。しかし、１０ｗｔ％を越
えて含有されると脆くなるので、その上限を１０ｗｔ％
とした。Mo: Mo is an important element for preventing stress corrosion cracking and pitting corrosion with respect to chlorides, and 3 wt% or more is necessary for the prevention. However, if it exceeds 10 wt%, it becomes brittle, so its upper limit is 10 wt%.
And
【０００８】Ｃｕ： Ｃｕは硫酸による孔食を防止する
のに重要な元素であり、最低１ｗｔ％が必要であり、含
有量が多すぎると、金属間化合物を形成して脆くなるの
でその上限を３ｗｔ％とした。なお、Ｃｕが耐孔食性を
防止するメカニズムについては明確ではないが、おそら
く表面にＣｕの酸化物を形成するためと考えられる。Cu: Cu is an important element for preventing pitting corrosion by sulfuric acid, and at least 1 wt% is necessary. If the content is too large, an intermetallic compound will be formed and become brittle, so the upper limit is set. It was set to 3 wt%. Although the mechanism by which Cu prevents pitting corrosion resistance is not clear, it is presumably because Cu oxide is formed on the surface.
【０００９】Ｎｉ： Ｎｉは組織的に安定なオーステナ
イトを形成するのに重要な元素である。Ni: Ni is an important element for forming a structurally stable austenite.
【００１０】以上の理由から、主として、Ｃｒ：１５〜
３０ｗｔ％，Ｍｏ：３〜１０ｗｔ％，Ｃｕ：１〜３ｗｔ
％，残りがＮｉよりなる組成は硫酸による耐孔食性が優
れており、これを鋳造することによって得られる脱硫フ
ァンは硫酸に対する耐食性が向上する。For the above reasons, mainly Cr: 15
30wt%, Mo: 3-10wt%, Cu: 1-3wt
%, And the balance consisting of Ni has excellent pitting corrosion resistance by sulfuric acid, and the desulfurization fan obtained by casting this has improved corrosion resistance against sulfuric acid.
【００１１】[0011]
【実施例】試作した材料の５０％硫酸中での腐食試験結
果を示す。表１中、Ｎｏ．１は現在脱硫ファン用として
使用されているＮｉ基の２０％Ｃｒ−６％Ｍｏ−Ｎｉ
（Ｂａｌ．）材料を示し、Ｎｏ．２〜Ｎｏ．１４は、真
空アーク溶解炉によって溶製したままの材料の組成を示
した。次に、これらを溶解のままの状態で、１４×１４
×３ｔに加工し、その表面をエメリペーパー＃１００，
＃１８０，＃２４０，＃３２０，＃４００，＃６００ま
で研磨して、アセトンで洗浄後、５０％硫酸中で２４時
間試験を行った。[Examples] The results of a corrosion test of the trial-produced material in 50% sulfuric acid are shown. In Table 1, No. 1 is a Ni-based 20% Cr-6% Mo-Ni currently used for desulfurization fans.
(Bal.) Material, No. 2-No. No. 14 shows the composition of the material as melted by the vacuum arc melting furnace. Next, in the state where they are dissolved, 14 × 14
Processed to × 3t, and its surface was emery paper # 100,
After polishing to # 180, # 240, # 320, # 400, and # 600, washing with acetone, a test was conducted in 50% sulfuric acid for 24 hours.
【００１２】表１からわかるように、Ｎｏ．１の従来材
料の腐食量は１５．４ｇ／ｍ2 ・ｈｒ、また、本発明範
囲外で、Ｃｒ量の少ないＮｏ．２，Ｎｏ．３、Ｍｏ量の
少ないＮｏ．５，Ｎｏ．１０及びＣｕ量の少ないＮｏ．
６，Ｎｏ．１１は腐食量が４．２〜３０．６ｇ／ｍ2 ・
ｈｒと大きい値を示している。これに対して、本発明範
囲内にあるＮｏ．４，Ｎｏ．７，Ｎｏ．８，Ｎｏ．９，
Ｎｏ．１２，Ｎｏ．１３及びＮｏ．１４は０．２〜０．
４ｇ／ｍ2 ・ｈｒの範囲内にあり、良好な耐食性を示す
ことがわかった。As can be seen from Table 1, No. The conventional material of No. 1 has a corrosion amount of 15.4 g / m 2 · hr, and is out of the range of the present invention. 2, No. No. 3, which has a small amount of Mo. 5, No. No. 10 and a small amount of Cu.
6, No. 11 has a corrosion amount of 4.2 to 30.6 g / m 2 ·
It shows a large value of hr. On the other hand, No. 1 within the scope of the present invention. 4, No. 7, No. 8, No. 9,
No. 12, No. 13 and No. 14 is 0.2-0.
It was found to be in the range of 4 g / m 2 · hr, showing good corrosion resistance.
【００１３】[0013]
【表１】 [Table 1]
【００１４】また、念のため、従来材であるＮｏ．１と
本発明範囲内にあるＮｏ．８の腐食試験後の表面状況の
電子顕微鏡写真を図１，図２に示す。図１は孔食が発生
しているのがわかるが、図２は孔食が発生せず、健全な
状態であることがわかる。As a precaution, the conventional material No. No. 1 within the scope of the present invention. Electron micrographs of the surface condition after the corrosion test of No. 8 are shown in FIGS. 1 shows that pitting corrosion has occurred, but FIG. 2 shows that pitting corrosion does not occur and it is in a healthy state.
【００１５】[0015]
【発明の効果】主として、Ｃｒ：１５〜３０ｗｔ％，Ｍ
ｏ：３〜１０ｗｔ％，Ｃｕ：１〜３ｗｔ％，残りがＮｉ
よりなる組成は硫酸による耐孔食性が優れており、これ
を鋳造することにより得られる材料は耐食性が向上し、
湿式排煙脱硫装置の脱硫ファン材料として適している。
それ故、本発明材料で製作した脱硫ファンは定期的に耐
硫酸塗料を塗布する必要がないので、経費を節約するこ
とができる。EFFECT OF THE INVENTION Cr: 15-30 wt%, M
o: 3-10 wt%, Cu: 1-3 wt%, balance Ni
The composition consisting of is excellent in pitting corrosion resistance by sulfuric acid, the material obtained by casting this has improved corrosion resistance,
It is suitable as a desulfurization fan material for wet flue gas desulfurization equipment.
Therefore, the desulfurization fan made of the material of the present invention does not need to be coated with the sulfuric acid-resistant paint on a regular basis, so that the cost can be saved.
【図１】従来の脱硫ファン用として使用されているＮｉ
基（２０ｗｔ％Ｃｒ，６ｗｒ％Ｍｏ，残部：Ｎｉ）材料
の５０％硫酸中で２４時間浸漬した試験片の表面の金属
組織を示す電子顕微鏡写真。FIG. 1 Ni used for a conventional desulfurization fan
The electron micrograph which shows the metallographic structure of the surface of the test piece which was immersed in 50% sulfuric acid of the base material (20 wt% Cr, 6 wr% Mo, the balance: Ni) for 24 hours.
【図２】本発明の一実施例の材料の５０％硫酸中で２４
時間浸漬した試験片の表面の金属組織を示す電子顕微鏡
写真。FIG. 2 24 of a material of one embodiment of the present invention in 50% sulfuric acid
The electron micrograph which shows the metallographic structure of the surface of the test piece immersed for time.
フロントページの続き (72)発明者 月元 正 長崎県長崎市深堀町五丁目717番１号 三 菱重工業株式会社長崎研究所内Continuation of the front page (72) Masaru Tsukimoto 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanryo Heavy Industries Ltd. Nagasaki Research Institute
Claims (2)
Ｍｏ：３〜１０，Ｃｕ：１〜３，残部：Ｎｉからなるこ
とを特徴とする耐硫酸腐食性材料。1. Cr, 15-30, mainly in weight%.
A sulfuric acid corrosion-resistant material characterized by comprising Mo: 3 to 10, Cu: 1 to 3, and the balance: Ni.
ることを特徴とする脱硫ファン用耐食材料。2. A corrosion resistant material for a desulfurization fan, comprising the sulfuric acid corrosion resistant material according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1822296A JPH09194973A (en) | 1996-01-10 | 1996-01-10 | Sulfuric acid corrosion resistant material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1822296A JPH09194973A (en) | 1996-01-10 | 1996-01-10 | Sulfuric acid corrosion resistant material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09194973A true JPH09194973A (en) | 1997-07-29 |
Family
ID=11965627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1822296A Withdrawn JPH09194973A (en) | 1996-01-10 | 1996-01-10 | Sulfuric acid corrosion resistant material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09194973A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1382696A1 (en) * | 2002-06-13 | 2004-01-21 | Haynes International, Inc. | Ni-Cr-Mo-Cu alloys resistant to sulfuric acid and wet process phosphoric acid |
| CN106544547A (en) * | 2016-10-31 | 2017-03-29 | 重庆材料研究院有限公司 | A kind of nuclear field radioactive liquid waste process corrosion resistant material and preparation method thereof |
| CN106756247A (en) * | 2016-10-31 | 2017-05-31 | 重庆材料研究院有限公司 | A kind of Spent Radioactive liquid processing device making material and preparation method thereof |
-
1996
- 1996-01-10 JP JP1822296A patent/JPH09194973A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1382696A1 (en) * | 2002-06-13 | 2004-01-21 | Haynes International, Inc. | Ni-Cr-Mo-Cu alloys resistant to sulfuric acid and wet process phosphoric acid |
| US6764646B2 (en) | 2002-06-13 | 2004-07-20 | Haynes International, Inc. | Ni-Cr-Mo-Cu alloys resistant to sulfuric acid and wet process phosphoric acid |
| KR100788533B1 (en) * | 2002-06-13 | 2007-12-24 | 하이네스인터내셔널인코포레이티드 | Ni-Cr-Mo-Cu ALLOYS RESISTANT TO SULFURIC ACID AND WET PROCESS PHOSPHORIC ACID |
| AU2003204654B2 (en) * | 2002-06-13 | 2008-10-23 | Haynes International, Inc | Ni-Cr-Mo-Cu alloys resistant to sulfuric acid and wet process phosphoric acid |
| CN106544547A (en) * | 2016-10-31 | 2017-03-29 | 重庆材料研究院有限公司 | A kind of nuclear field radioactive liquid waste process corrosion resistant material and preparation method thereof |
| CN106756247A (en) * | 2016-10-31 | 2017-05-31 | 重庆材料研究院有限公司 | A kind of Spent Radioactive liquid processing device making material and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030401 |