CN1172159C - Ferritic stainless steel heat-exchanger - Google Patents
Ferritic stainless steel heat-exchanger Download PDFInfo
- Publication number
- CN1172159C CN1172159C CNB011383135A CN01138313A CN1172159C CN 1172159 C CN1172159 C CN 1172159C CN B011383135 A CNB011383135 A CN B011383135A CN 01138313 A CN01138313 A CN 01138313A CN 1172159 C CN1172159 C CN 1172159C
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- Prior art keywords
- stainless steel
- heat exchanger
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- corrosion
- steel
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
- F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nonmetallic Welding Materials (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention relates to a ferritic stainless steel heat exchanger which is characterized in that seamless steel pipes of ferritic stainless steel RT360, namely OCr13Ti (or Nb) RE are used for manufacturing heat exchanger pipes 3-2 of a pipe bundle of the heat exchanger; welding materials use ultra-low carbon austenitic stainless steel welding wires 308L (H00Cr20Ni10) or H00Cr18Ni12Mo2 to carry out weld by argon arc welding. Compared with 18-8 austenitic stainless steel, because of no alloy element with sensitive stress corrosion in composition design, the present invention has congenital immunological competence to stress corrosion and also has certain competence of general corrosion resistance; the performance of the present invention is superior to that of the 18-8 austenitic stainless steel under the corrosion environment of having chloride and sulfide, and the price of the present invention is lower than that of the 18-8 austenitic stainless steel, so that the present invention is a steel grade with super quality and lower investment, and moreover, the present invention can be widely used for the corrosion environments of industries, such as petroleum, chemical industry, power, etc.
Description
Technical field:
The present invention relates to corrosion-resistant pipe shell heat exchanger, the condenser of industries such as oil, chemical industry, electric power.
Background technology:
At oil, chemical industry, in the industries such as electric power, the environment that has a large amount of chlorions and hydrogen sulfide corrosion, shell-and-tube heat exchanger, condenser and finned air cooler, because the thin (δ≤3.5mm) of heat exchanger tube and finned tube parent tube wall thickness, the ordinary carbon steel pipe is (as No. 10, No. 20) do not possess corrosion resistance, generally can only be with just corrosion failure of some months, though and austenitic stainless steel has anti-preferably pitting corrosion, spot corrosion and homogeneous corrosion performance, but because austenitic stainless steel (18-8,304L, 316,316L) anticorrosion stress-resistant performance extreme difference and limited it and in chloride ion-containing and hydrogen sulfide medium environment, used.HCI-H as normal top condenser in the oil refining apparatus
2In the S corrosive medium, some enterprises have selected for use expensive two phase stainless steel or titanium pipe to do heat exchanger tube, but are difficult to generally be applied owing to it costs an arm and a leg.For a long time in similar corrosive environment, be difficult to find a kind of alternative material of economy and durability always, many enterprises have to be dealt with the form of spraying, but the service life of carbon steel spraying can be above 2 years yet, come off easily because carbon steel is sprayed under the effect of high temperature and flow velocity, still be difficult to satisfy the requirement of process units long-term operation.The 0Cr13 steel of former national standard, its chemical composition are designed to formulate the seventies and use till today, and the composition of Si and Mn is higher, have certain fragility harm, and the control that the bigger Cu of ferrite harm and Ni are not also carried out minimum requirements.Though have sheet material using, when tube drawing, can produce very significantly brittle crack.In addition, owing to do not have stabilizing element Ti (or Nb) in the composition design, material Cr when welding separates out from the heat affected area, can cause the poor Cr of weld metal zone, therefore, easily causes intercrystalline corrosion harm, and then easily produces stress corrosion inclination.I had once declared " a kind of rare earth steel heat exchanger of hydrogen sulfide corrosion-resistant ", the patent No. in 1999: 991166582, because used 09Cr2AlMoRE rare earth steel is a low-alloy steel, the metallographic structure performance is ferrite+pearlite.Though the sulfurated hydrogen stress etching-resisting performance is fine, its welding performance is relatively poor, and preheating during welding, after heat and post weld heat treatment quite bother.
The objective of the invention is provides a kind of both anti-chloride and H 2 S stress corrosion for industries such as oil, chemical industry, electric power, the ferrite stainless steel tubing that certain anti-homogeneous corrosion ability is arranged again, and make heat exchanger and air cooler, and tower inner member and tower tray with the ferrite stainless steel tubing.
Summary of the invention:
The objective of the invention is by following scheme implementation:
At first, develop a kind of both anti-muriatic stress corrosion, have the stronger anti-chloride spot corrosion and the ferrite stainless steel tubing of crevice corrosion ability again, its decay resistance is higher than ferritic stainless steel 0Cr13 commonly used, has good welding performance simultaneously again.(%) is as follows for its chemical composition: C≤0.06; Si≤0.60; Mn≤0.80; Cr:11.0-15.0; Ni≤0.25; Cu≤0.25; Ti (or Nb): 5 * C≤0.80; S≤0.025; P≤0.030; RE addition≤0.20; Surplus is iron (Fe).
Determine that according to the proportioning of chemical composition in the steel its grade of steel is 0Cr13TiRE or 0Cr13NbRE.
A. since in the steel content of austenite former Ni extremely low, so 0Cr13Ti (Nb) RE belongs to pure ferritic stainless steel, when Cu+Ni in the steel≤0.50%, the 0Cr13Ti of annealed state (Nb) RE does not produce the chloride stress cracking corrosion failure.
B. in order to prevent intercrystalline corrosion, stabilizing element Ti (or Nb) must satisfy: 5 * C≤0.80%.Xiang Gangzhong adds Ti (or Nb), can make the carbide that contains chromium in the steel, carbide, the nitride that nitride transfers to form titaniferous (or Nb), and carbon and nitrogen are played static stabilization, and the crystal grain of refinement ferritic stainless steel.
C. add rare earth (RE) and be the outstanding feature of the technical program in composition design, the adding of rare earth is to control form, size and the quantity of steel inclusion, the up to the present domestic precedent that does not also add rare earth in stainless steel.Because rare earth (RE) can have great affinity interaction with low-melting-point metal and nonmetal composition S, O, N, C, the Si in the steel, can control the form and the size of the field trash in the steel effectively, pure steel, the corrosion resistance and the impact flexibility of raising steel.Simultaneously, because C, N in rare earth energy and the steel form corresponding compounds, when welding, can stop heat affected area Cr effectively
23C
6And Cr
2N separates out at crystal boundary, is quite useful to the intergranular corrosion resistance ability that improves ferritic stainless steel.The ability of rare earth desulfurization and deoxidation and calcium magnesium seemingly and can be controlled form, size and the quantity of the field trash of oxygen and sulphur in the steel effectively.
With the heat exchanger tube (3-2) of 0Cr13Ti (or Nb) RE steel tubing manufacturing heat exchanger and condenser, with muriatic spot corrosion and pitting corrosion in the opposing medium, and the stress corrosion of chloride and sulfide.Available common 16Mn forging of tube sheet (3-1) or 304L, 316L stainless steel.In order to prevent to produce too much carbide Cr at weld heat-affected zone
23C
6And Cr
2N forms the poor of weld metal zone
Cr, therefore, the welding material of 0Cr13Ti (or Nb) RE should be used ultra-low carbon austenitic stainless steel welding wire 308L (H00Cr20Ni10) or H00Cr18Ni12Mo2, weld with argon arc welding, without preheating and heat treatment, weld seam is ferrite and austenite duplex structure, has goodish decay resistance.
Description of drawings:
Further specify below in conjunction with diagram:
Fig. 1: be heat exchanger, wherein part 1 is an end socket, and part 2 is a bobbin carriage, and part 3-0 is tube bank, and part 4 is a housing.
Fig. 2: be tube bank 3-0, wherein 3-1 is a tube sheet, and 3-2 is a heat exchanger tube, and 3-3 is a deflection plate.
The specific embodiment:
Among the figure, the material of 3-1 tube sheet is 16Mn+0Cr13 or 304L, and the material of 3-2 heat exchanger tube is 0Cr13Ti (or Nb) RE, and 3-3 deflection plate material is 0Cr13 or 18-8.
0Cr13Ti of the present invention (or Nb) RE heat exchanger is compared with 18-8 austenitic stainless steel heat exchanger, owing to there is not the alloying element of counter stress corrosion-susceptible in the composition design, the counter stress corrosion has geneogenous immunocompetence, thereby has goodish anticorrosion stress-resistant performance.Simultaneously, because Gao Ge in the steel, its anti-general corrosion performance is also comparatively superior.The total cost of 0Cr13Ti (or Nb) RE heat exchange equipment is lower than the 18-8 austenitic stainless steel, and can overcome the insoluble stress corrosion harm of 18-8 austenitic stainless steel institute, has boundless market prospects.But industries such as the present invention's extensive use and oil, chemical industry, electric power.
Claims (3)
1. ferrite stainless heat exchanger, it is by end socket (1), bobbin carriage (2), tube bank (3-0), housing (4) constitutes, described tube bank (3-0) comprises tube sheet (3-1), heat exchanger tube (3-2) and deflection plate (3-3), it is characterized in that: the used heat exchanger tube (3-2) of heat exchanger adopts ferritic stainless steel 0Cr13TiRE or 0Cr13NbRE seamless steel pipe to make.
2. a kind of ferrite stainless heat exchanger as claimed in claim 1 is characterized in that: the chemical composition (%) of ferritic stainless steel 0Cr13TiRE or 0Cr13NbRE tubing is: C≤0.06; Si≤0.60; Mn≤0.80; Cr:11.0-15.0; Ni≤0.25; Cu≤0.25; Ti:5 * C≤0.80 or Nb:5 * C≤0.80; S≤0.025; P≤0.030; RE addition≤0.20; Surplus is iron (Fe).
3. a kind of ferrite stainless heat exchanger as claimed in claim 1, it is characterized in that: the material of tube sheet (3-1) is 16Mn+0Cr13, the material of heat exchanger tube (3-2) is 0Cr13TiRE or 0Cr13NbRE, the material of deflection plate (3-3) is 0Cr13, the welding material of heat exchanger tube (3-2) welds with ultra-low carbon austenitic stainless steel welding wire H00Cr20Ni10 or H00Cr18Ni12Mo2, argon arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011383135A CN1172159C (en) | 2001-12-18 | 2001-12-18 | Ferritic stainless steel heat-exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011383135A CN1172159C (en) | 2001-12-18 | 2001-12-18 | Ferritic stainless steel heat-exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1367368A CN1367368A (en) | 2002-09-04 |
| CN1172159C true CN1172159C (en) | 2004-10-20 |
Family
ID=4674519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011383135A Expired - Fee Related CN1172159C (en) | 2001-12-18 | 2001-12-18 | Ferritic stainless steel heat-exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1172159C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2351281B1 (en) * | 2009-02-03 | 2011-09-28 | Valeo Termico, S.A. | HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE. |
| CN105397437A (en) * | 2015-12-24 | 2016-03-16 | 常熟市欧迪管业有限公司 | Titanium tube for heat exchanger |
| CN108406058A (en) * | 2018-02-01 | 2018-08-17 | 浙江宣达特种合金流程装备股份有限公司 | Novel Ni-Cr corrosion resistant alloys heat exchanger tube sheet and its welding procedure |
-
2001
- 2001-12-18 CN CNB011383135A patent/CN1172159C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1367368A (en) | 2002-09-04 |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20041020 Termination date: 20101218 |