CN1024691C - 抗硫酸露点腐蚀低合金钢 - Google Patents
抗硫酸露点腐蚀低合金钢 Download PDFInfo
- Publication number
- CN1024691C CN1024691C CN 90101258 CN90101258A CN1024691C CN 1024691 C CN1024691 C CN 1024691C CN 90101258 CN90101258 CN 90101258 CN 90101258 A CN90101258 A CN 90101258A CN 1024691 C CN1024691 C CN 1024691C
- Authority
- CN
- China
- Prior art keywords
- dew point
- steel
- low alloy
- sulfuric acid
- point 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.)
- Expired - Fee Related
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 30
- 230000007797 corrosion Effects 0.000 title claims abstract description 30
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title abstract description 18
- 239000000203 mixture Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 23
- 239000010959 steel Substances 0.000 abstract description 23
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 2
- 239000010949 copper Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- 239000001117 sulphuric acid Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 206010052428 Wound Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
本发明涉及一种低合金钢,特别是抗硫酸露点腐蚀低合金钢,其特征在于各成份的重量百分比含量为C0.08~0.15、Si0.2~0.4、Mn0.6~1.0、P≤0.035、S0.01~0.035、Cu0.2~0.4、Cr0.4~1.0、V0.02~0.15(加入量)。它是一种既经济又耐硫酸露点腐蚀的钢种,可满足我国发电机组预热器耐蚀的需要,经研制和工业性应用试验测试证明,它能使空气预热器的寿命比A,钢提高3~4倍,且不需要换新钢板。
Description
本发明涉及抗硫酸露点腐蚀的一种低合金钢。
目前火力发电机组,绝大部分以固体燃料(煤)或液体燃烧(原油)作为能源。无论是煤或原油中都含有一定量的硫,因此燃烧后的烟气中含有硫的氧化物。在发电机组锅炉空气预热器中,三氧化硫与空气中的水份相结合,形成硫酸蒸气,遇到温度低于硫酸露点的空气预热器壁板就发生凝聚,使空气预热器受到腐蚀。这被称为硫酸露点腐蚀。
我国火力发电机组的锅炉空气预热器,目前都是使用普通碳素三号钢(A5)制造,由于该钢种抗硫酸露点腐蚀性能很差,使用不到两年预热器就被腐蚀穿孔,给发电机组的安全运行造成很大隐患,由此增加了停机时间,加大了维修时间和经费,降低了发电机组的可用率,还提高了度电煤耗量,增加了发电成本。
许多发达的工业国为了解决发电机组空气预热器的硫酸露点腐蚀问题,进行大量的研究工作。如添加中和剂,提高进风空气温度;但由于工艺复杂,而且影响热传递效果,增加了发电成本,实际应用的很少。
本发明的目的,是研制一种抗硫酸露点腐蚀的钢种,做为发电机组空气预热器本体和受热面的材料。
这种钢按以下抗硫酸露点腐蚀机理研制成功:在发电机组空气预热器内,燃烧的烟气中,SO,转换的硫酸中含有大量的未燃烧的碳微粒,在它的催化氧化作用下,使钢生成大量的Fe+++离子,对普碳钢来说,仍处于活性腐蚀状态,腐蚀速率仍旧很高,而对含有铬或硼的铜钢会出现第一次钝化,腐蚀速度显著降低。C在钢中以碳化物形式存在,Si、Mn起固溶强化作用,提高钢的强度。抗硫酸露点腐蚀最重要元素是铜。并必须有适量的Cr和S,其合金元素含量Cr0.4~1.0%,Si0.2~0.4%,S要控制在0.01~0.035%之间。含铜钢在硫酸露点腐蚀过程中,钢板表面能生成一种Cu2S的保护膜,从而阻滞阴阳极反应,降低腐蚀率。
表见文后
下面是本发明的一个实施例:将抗硫酸露点腐蚀低合金钢,化学成分为C0.14%,Si0.25%,Mn0.70%,P0.029%,S0.018%,Cu0.36%,Cr0.6%,V0.035%的钢板,在某电厂4#机组锅炉空气预热器本体上试验,经运行一年半时间后,原钢板厚度6.2mm,经超声波测厚仪测试为5.93mm一年半只减厚0.27mm,全部钢板没有坑蚀、针孔腐蚀现象,呈均匀腐蚀状态,而对比钢种A3钢板,却呈现出千疮百孔的腐蚀坑点及严重的腐蚀孔洞。抗硫酸露点腐蚀低合金钢板与A3钢板在发电机组空气预热器内三个周期(半年一个周期共一年半)的对比挂片测试结果如下表。
表见文后
抗硫酸露点腐蚀低合金钢的金相组织为铁素体+珠光体,晶粒度为7级。另外,本钢种还具备综合力学性能好(见下表)并易于焊接(有专门匹配焊条)的优点。
表见文后
抗硫酸露点腐蚀低合金钢化学成分
元素 C Si Mn P S Cu Cr V
重量 0.02
0.08 0.2 0.6 0.01 0.2 0.4
百分比 ≤0.035 ~0.15
~0.15 ~0.4 ~1.0 ~0.095 ~0.4 ~1.00
(%) (加入量)
抗硫酸露点腐蚀低合金钢力学性能表
性能 σ5σbσ5冷弯 时效冲击
标准与 kgf/mm2kgf/mm2% D=2a180° kgfM/cm2
实际性能
企业标准 ≥30.0 ≥45.0 ≥22.0 不裂 ≥3.0
实际性能平均值 38.59 54.2 25.63 6.3
32.2 47.2~ 22.0~ 全部合格
波动范围 5.0~7.8
~47.9 61.2 31.0
腐蚀性能
周期 年腐蚀率 平均腐蚀 最大腐蚀
钢种 (mm/年) 坑率(mm) 坑率(mm)
第一周期
0.14 / 0.10
(半年)
抗硫酸露点 第二周期
0.069 0.11 0.17
腐蚀低合金钢 (一年)
第三周期
0.049 0.15 0.20
(一年半)
第一周期(半年) 0.56 / 0.95
第二周期(一年) 0.359 1.43 1.73
A,钢
第三周期
0.176 0.93 1.30
(一年半)
第一周期(半年) 4.0 / 9.5
比A,钢 第二周期(一年) 5.2 13.0 10.0
降低倍数 第三周期
3.6 6.2 6.5
(一年半)
Claims (1)
1、一种抗硫酸露点腐蚀的低合金钢,其特征在于其他学成份(重量%)为:C0.08~0.15、Si0.2~0.4、Mn0.6~1.0、Cu0.2~0.4、Cr0.4~1.0、S0.01~0.035%,V0.035%,其余为Fe。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 90101258 CN1024691C (zh) | 1990-03-13 | 1990-03-13 | 抗硫酸露点腐蚀低合金钢 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 90101258 CN1024691C (zh) | 1990-03-13 | 1990-03-13 | 抗硫酸露点腐蚀低合金钢 |
CN 91102571 CN1054622A (zh) | 1991-04-24 | 1991-04-24 | 氮基保护气氛制气剂 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1054802A CN1054802A (zh) | 1991-09-25 |
CN1024691C true CN1024691C (zh) | 1994-05-25 |
Family
ID=25742620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 90101258 Expired - Fee Related CN1024691C (zh) | 1990-03-13 | 1990-03-13 | 抗硫酸露点腐蚀低合金钢 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN1024691C (zh) |
-
1990
- 1990-03-13 CN CN 90101258 patent/CN1024691C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN1054802A (zh) | 1991-09-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3584636B2 (ja) | 熱間加工性に優れた耐硫酸・塩酸露点腐食鋼 | |
TWI312373B (en) | A steel with sulfuric acid dew-point corrosion resistance | |
KR100318529B1 (ko) | 내황산부식성과 가공성이 우수한 오스테나이트계 스테인레스강 | |
ES2032099T3 (es) | Aleacion de niquel-cromo-molibdeno. | |
CN1455822A (zh) | 具有优异的耐硫酸露点腐蚀性的钢和空气预热器 | |
CN102534381A (zh) | 一种全候型低成本耐候钢 | |
CN1024691C (zh) | 抗硫酸露点腐蚀低合金钢 | |
TWI503422B (zh) | 具優異耐蝕性及加工性之肥粒鐵系不鏽鋼 | |
JPH068485B2 (ja) | 耐食性の優れた煙突・煙道および脱硫装置用高合金ステンレス鋼 | |
CN101892438B (zh) | 一种耐高温硫酸露点腐蚀的稀土低合金钢 | |
CN1018848B (zh) | 奥氏体镍-铬-铁合金结构零件的改进 | |
JPH083666A (ja) | 加工性および耐食性に優れたNi基合金 | |
CN113684417A (zh) | 一种经济型690MPa级低合金耐蚀耐火钢 | |
JP3153981B2 (ja) | 硫酸と塩酸を同時に生成する露点環境中で優れた耐食性を示す高合金ステンレス鋼 | |
JP3303024B2 (ja) | 耐硫酸腐食性および加工性に優れたNi基合金 | |
US4547338A (en) | Fe-Ni-Cr corrosion resistant alloy | |
Smith et al. | The corrosion resistance of nickel-containing alloys in coal-fired boiler environments | |
Nakagawa et al. | Effect of HCI on the corrosion of waterwall tubes in a waste incineration plant | |
CN101892433A (zh) | 一种耐低温硫酸露点腐蚀的低合金钢 | |
CN1123845A (zh) | 耐硫酸露点腐蚀钢 | |
JP3923163B2 (ja) | 廃棄物焼却炉 | |
JP3239763B2 (ja) | 耐硫酸腐食性に優れたオーステナイト系ステンレス鋼 | |
JP2000001755A (ja) | 耐硫酸露点腐食性に優れたオーステナイト系ステンレス鋼及びその製造方法 | |
Li et al. | Research on the corrosion protection technology of boilers under high temperature | |
JPS5983748A (ja) | 極低炭素低合金耐酸鋼 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C06 | Publication | ||
PB01 | Publication | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee | ||
MM4A | Cease of patent right caused by unpayment of annual fee |