CN1490427A - Low alloy steel-09CrCuSb (ND steel) for sulfuric acid proof dew point corrosive seamless steel pipe - Google Patents
Low alloy steel-09CrCuSb (ND steel) for sulfuric acid proof dew point corrosive seamless steel pipe Download PDFInfo
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- CN1490427A CN1490427A CNA031308252A CN03130825A CN1490427A CN 1490427 A CN1490427 A CN 1490427A CN A031308252 A CNA031308252 A CN A031308252A CN 03130825 A CN03130825 A CN 03130825A CN 1490427 A CN1490427 A CN 1490427A
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- sulfuric acid
- dew point
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Abstract
A low-alloy ND steel 09CrCuSb resistant to the dew-point corrosion of sulfuric acid for seamless steel pipe, plate, forged part and special welding material is prepared through smelting in ultrahigh-power electric furnace, refining outside the furnace, vacuum degassing, conticasting and tandem rolling. It features that during the corrosion, a compact passivated film rich in Cr, Cu, Sb and Ti is generated on its surface, so having very high anticorrosion power.
Description
Technical field
The present invention relates to a kind of structural low, particularly a kind of sulfuric acid dew point corrosion resistant low alloy steel comprises weldless steel tube, plate, forging and welding material special thereof.
Background technology
At present energy problem becomes more and more important, and along with a large amount of exploitations of oil and coal, the content of sulphur is more and more higher in the fuel, thereby causes burning or heat exchange system equipment suffers serious corrosion, the dew point corrosion that particularly takes place in process of cooling.For example the economizer of making at 20g soft steel moves less than one-period because of corrosion.If funnel temperature slightly reduces or sulphur content has rising slightly, will cause the very fast leakage in economizer tube.Stainless erosion rate is also higher than soft steel under this environment, therefore also is difficult for using stainless steel.For solving this difficult problem, people adopt the method that improves funnel temperature, or adopt non-metallic material pipe such as Glass tubing to replace steel pipe, yet have influenced thermo-efficiency like this, have also increased technical difficulty.
Summary of the invention
The present invention seeks to develop a kind of low alloy steel of sulfuric acid dew point corrosion resistant, replace 20g soft steel or high quality steel commonly used.
The formation element of corrosionproof steel against sulfuric acid at dew point of the present invention is C, Si, Mn, Cr, Cu, Sb, Ti and Fe.Its chemical ingredients (weight %) is: C≤0.12%, Si0.20-0.40%, Mn0.35-0.65%, P≤0.035%, S≤0.035%, Cr0.70-1.10%, Cu0.25-0.45%, Sb0.04-0.10%, Ti0.03-0.07%, Fe surplus.
ND steel of the present invention is a kind of low alloy steel of developing by electrochemistry and sufacing.Because the ND steel can form the fine and close passive film that several times of matrixes are rich in elements such as Cr, Cu, Sb, Ti that is higher than of one deck densification on its surface in corrosion process, thereby has the ability of high sulfuric-resisting dew point corrosion.Test shows that in 70 ℃ of 50% aqueous sulfuric acid, the ability of the anti-uniform corrosion of ND steel of the present invention is 10 times of 20g soft steel, is 304 stainless 3 times, is 1.5 times of Japanese similar steel grade CR1A.
The production technique of ND steel of the present invention: smelt with ultra-high power electric arc furnace, eccentric bottom tapping, the refining of LF refining furnace, the degassing of VD vacuum degassing furnace, the bloom caster continuous casting, heat is sent tandem rolling.
The performance of ND steel of the present invention
Mechanical property
The unit elongation δ of ND steel of the present invention
5〉=25%, suitable with 20g soft steel, but tensile strength sigma
b390-550Mpa, yield strength σ
s〉=245 Mpa are than 20g soft steel height.When temperature is higher than 200 ℃, the σ of 20g soft steel
s, σ
bObviously reduce, however the σ of ND steel of the present invention
s, σ
bAlmost do not change.
Welding property
ND steel of the present invention has good welding property, with other steel grade such as 20g soft steel, 16MnR low alloy steel good weldability is arranged also.Table 1 is the mechanical property comparison of ND steel weld seam and mother metal, and the mechanical property of weld seam is almost identical with mother metal, gets ND steel weld seam and base metal test specimen and soaks 6 hours in 70 ℃ following 50% sulphuric acid soln, and the erosion rate of mother metal is 7.12mg/cm
2H, and the corrosion speed of weld seam is 3.04mg/cm
2H.That is to say that the ND Steel Electrode has good weldability, the weld seam solidity to corrosion is also higher simultaneously.This mainly is because welding rod has good element transition in welding process, has guaranteed the Chemical Composition and the tissue of weld seam.
The mechanical property of table 1 ND steel of the present invention mother metal and weld seam
| Temperature (℃) | Material | ?σ b(Mpa) | ?σ s(Mpa) | ??δ 5(％) | Remarks |
| ????25 | Mother metal | ????410 | ????295 | ????34 | Break at mother metal |
| Weld seam | ????438 | ????305 | |||
| ????100 | Mother metal | ????400 | ????270 | ????31 | Break at mother metal |
| Weld seam | ????400 | ????260 | |||
| ????150 | Mother metal | ????422 | ????268 | ????28 | Break at mother metal |
| Weld seam | ????405 | ????270 | |||
| ????200 | Mother metal | ????410 | ????265 | ????27 | Break at mother metal |
| Weld seam | ????405 | ????275 | |||
| ????250 | Mother metal | ????430 | ????267 | ????27 | Break at mother metal |
| Weld seam | ????418 | ????268 | |||
| ????300 | Mother metal | ????438 | ????245 | ????25 | Break at mother metal |
| Weld seam | ????430 | ????275 | |||
| ????350 | Mother metal | ????443 | ????228 | ????29 | Break at mother metal |
| Weld seam | ????437 | ????240 | |||
| ????400 | Mother metal | ????430 | ????220 | ????31 | Break at mother metal |
| Weld seam | ????440 | ????230 | |||
| ????450 | Mother metal | ????380 | ????210 | ????24 | |
| ????500 | Mother metal | ????340 | ????200 | ????36 |
Solidity to corrosion
For most of steel, at 70 ℃ of 50%H
2SO
4Erosion rate maximum in the aqueous solution, the erosion resistance of therefore measuring steel with this understanding has the representativeness of accelerated test.ND steel of the present invention is at 70 ℃ of 50%H
2SO
4Corrosion potential in the aqueous solution is-350mv, and the A3 steel is-400mv.There is a passivation region in ND steel of the present invention in from-200mv to+400mv scope, and the A3 steel is in active state all the time.Particularly when passive film forms on ND steel surface, has only the blunt electric current of lower dimension.
At 70 ℃ of following 50%H
2SO
4Soak after 6 hours in the solution and calculate erosion rate, ND steel of the present invention is 7.3mg/cm
2H, and the A3 steel is 103.5mg/cm
2H, CRIA steel are 63.0mg/cm
2H, 20g soft steel are 56.4mg/cm
2H, Corten steel are 13.4mg/cm
2H.Therefore compare with domestic and international other steel grade, ND steel of the present invention has higher solidity to corrosion.Test-results shows that ND steel of the present invention not only has high sulfuric-resisting dew point corrosion ability, and at Cl
-And Cl
-+ SO
4 2Also has very high solidity to corrosion in the environment.
Because ND steel of the present invention has very high solidity to corrosion, can be widely used in industries such as oil, chemical industry, electric power, metallurgy, is used for making coal device, air preheater, heat exchanger, waste heat boiler, chimney etc.The most successful example is the economizer that is used to make refinery catalysis workshop process furnace.Economizer adopted the manufacturing of 20g soft steel in the past, owing to contain SO in the coal gas
2, SO
3, CO
2, H
2Obnoxious flavoures such as S, each component content of this obnoxious flavour sees Table 2, and these obnoxious flavoures make the economizer tube that local corrosion constantly take place to cause leaking, and work-ing life, wherein the shortest had only 12 days less than 2 months.After using ND steel of the present invention instead, economizer has moved 5 years continuously and has not also leaked.
Table 2: economize the gas smoke composition
| ?O 2(％) | ??CO 2(％) | ??N(mg/l) | ??H 2O(mg/l) | ??SO 2(mg/l) | ?H 2S(mg/l) | ??SO 3(mg/l) |
| ?7.0 | ??11.5 | ??1365 | ??9.5 | ??300 | ?13.5 | ??103 |
Embodiment
According to the chemical ingredients of ND steel of the present invention, adopt ultra-high power electric arc furnace to smelt, eccentric bottom tapping, external refining, vacuum outgas, continuous pouring, then heat send tandem rolling to prepare three stove steel.Its concrete Chemical Composition sees Table 3:
The Chemical Composition (weight %) of table 3:ND steel
| ??NO. | ??C | ??Si | ??Mn | ??P | ??S | ??Cr | ??Cu | ??Sb | ??Ti | ??Fe |
| ??1 | ??0.08 | ??0.34 | ??0.52 | ??0.010 | ??0.012 | ??0.98 | ??0.31 | ??0.059 | ??0.05 | Surplus |
| ??2 | ??0.10 | ??0.32 | ??0.53 | ??0.017 | ??0.013 | ??0.94 | ??0.29 | ??0.072 | ??0.03 | Surplus |
| ??3 | ??0.09 | ??0.31 | ??0.51 | ??0.016 | ??0.014 | ??0.94 | ??0.30 | ??0.084 | ??0.03 | Surplus |
The performance of the three stove steel that record through test is listed in table 4
The performance of table 4:ND steel
| ???NO. | Yield strength σ s????(Mpa) | Tensile strength sigma b???(Mpa) | Unit elongation δ 5????(％) | ???70℃50％H 2SO 4Corrosion rate (mg/cm in the solution 2h) |
| ????1 ????2 ????3 | ????320 ????305 ????295 | ????430 ????460 ????410 | ????38 ????39 ????37 | ????????11.4 ????????11.7 ????????12.7 |
Claims (3)
1. a sulfuric acid dew point corrosion resistant low alloy steel comprises weldless steel tube plate, forging and welding material special thereof, it is characterized in that it constitutes element is C, Si, Mn, Cr, Cu, Sb, Ti and Fe.
2. sulfuric acid dew point corrosion resistant low alloy steel according to claim 1 comprises weldless steel tube, plate, forging and welding material special thereof, it is characterized in that its chemical ingredients (weight %) is: C≤0.12%, Si0.20-0.40%, Mn0.35-0.65%, P≤0.035%, S≤0.035%, Cr0.70-1.10%, Cu0.25-0.45%, Sb0.04-0.10%, Ti0.03-0.07%, the Fe surplus, its solidity to corrosion is: at 70 ℃ of 50%H
2SO
4In erosion rate≤13mg/cm
2H.
3. sulfuric acid dew point corrosion resistant low alloy steel according to claim 1, the purposes that comprises weldless steel tube, plate, forging and welding material special thereof are to make oil, chemical industry, electric power, metallurgical with economizer, heat exchanger, air preheater, waste heat boiler, chimney etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031308252A CN1490427A (en) | 2003-05-08 | 2003-05-08 | Low alloy steel-09CrCuSb (ND steel) for sulfuric acid proof dew point corrosive seamless steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031308252A CN1490427A (en) | 2003-05-08 | 2003-05-08 | Low alloy steel-09CrCuSb (ND steel) for sulfuric acid proof dew point corrosive seamless steel pipe |
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| Publication Number | Publication Date |
|---|---|
| CN1490427A true CN1490427A (en) | 2004-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031308252A Pending CN1490427A (en) | 2003-05-08 | 2003-05-08 | Low alloy steel-09CrCuSb (ND steel) for sulfuric acid proof dew point corrosive seamless steel pipe |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104117824A (en) * | 2014-07-22 | 2014-10-29 | 上海加宁新技术研究所 | Manufacturing method of super high pressure seamless alloy steel pipe |
| CN104593699A (en) * | 2014-12-09 | 2015-05-06 | 北京国电富通科技发展有限责任公司 | Welded steel pipe |
| CN104930900A (en) * | 2015-07-09 | 2015-09-23 | 济南屹林科技有限公司 | Copper-chromium-based TGr-titanium film thread pipe type air preheater and pipe film component |
| CN108660385A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of low-alloy steel of acid corrosion-resistant, steel pipe, steel plate and its manufacturing method |
| CN113926999A (en) * | 2021-10-25 | 2022-01-14 | 江苏长强钢铁有限公司 | Production method of sulfuric acid low-temperature dew point corrosion resistant steel 09CrCuSb |
| CN114096692A (en) * | 2019-07-09 | 2022-02-25 | 杰富意钢铁株式会社 | Seamless steel pipe having excellent sulfuric acid dew point corrosion resistance and method for producing same |
| WO2024075258A1 (en) * | 2022-10-06 | 2024-04-11 | 日本製鉄株式会社 | Seamless steel tube |
-
2003
- 2003-05-08 CN CNA031308252A patent/CN1490427A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104117824A (en) * | 2014-07-22 | 2014-10-29 | 上海加宁新技术研究所 | Manufacturing method of super high pressure seamless alloy steel pipe |
| CN104593699A (en) * | 2014-12-09 | 2015-05-06 | 北京国电富通科技发展有限责任公司 | Welded steel pipe |
| CN104930900A (en) * | 2015-07-09 | 2015-09-23 | 济南屹林科技有限公司 | Copper-chromium-based TGr-titanium film thread pipe type air preheater and pipe film component |
| CN108660385A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of low-alloy steel of acid corrosion-resistant, steel pipe, steel plate and its manufacturing method |
| CN114096692A (en) * | 2019-07-09 | 2022-02-25 | 杰富意钢铁株式会社 | Seamless steel pipe having excellent sulfuric acid dew point corrosion resistance and method for producing same |
| CN113926999A (en) * | 2021-10-25 | 2022-01-14 | 江苏长强钢铁有限公司 | Production method of sulfuric acid low-temperature dew point corrosion resistant steel 09CrCuSb |
| WO2024075258A1 (en) * | 2022-10-06 | 2024-04-11 | 日本製鉄株式会社 | Seamless steel tube |
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