CN1367367A - Ferritic stainless steel air-cooling device - Google Patents
Ferritic stainless steel air-cooling device Download PDFInfo
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- CN1367367A CN1367367A CN 01138315 CN01138315A CN1367367A CN 1367367 A CN1367367 A CN 1367367A CN 01138315 CN01138315 CN 01138315 CN 01138315 A CN01138315 A CN 01138315A CN 1367367 A CN1367367 A CN 1367367A
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- stainless steel
- steel
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- cooling device
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- 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
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Arc Welding In General (AREA)
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Abstract
The ferrite stainless steel air cooling device is characterized by that the base tube of fin tube for tube bundle of air cooling device adopts ferrite stainless steel RT360, i.e. it is made up by using OCr13Ti(Nb)RE seamless steel tube, its welding material uses utlra-low carbon austenitic stainless steel welding wire 308L(HOOCr20Ni10) or HOOCrI8Ni12Mo2, it adopts argon arc welding process. It possesses a certain corrosion resistance.
Description
The present invention relates to the corrosion-resistant aerial cooler of industries such as oil, chemical industry, electric power.
In industries such as oil, chemical industry, electric power, the environment that has a large amount of chlorions and hydrogen sulfide corrosion, because the thin (δ≤3.5mm) of the finned tube parent tube wall thickness of finned air cooler, ordinary carbon steel pipe (as No. 10, No. 20) does 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,, in chloride ion-containing and hydrogen sulfide medium environment, uses austenitic stainless steel (18-8,304L, 316,316L) anticorrosion stress-resistant performance extreme difference owing to having limited it.HCl-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 and air cooler tube bundle, 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 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 cause intercrystalline corrosion harm, and then easily produce 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 has the ferrite stainless steel tubing of certain anti-homogeneous corrosion ability again for industries such as oil, chemical industry, electric power provide a kind of both anti-chloride and H 2 S stress corrosion, and makes air cooler tube bundle with the ferrite stainless steel tubing.
The objective of the invention is by following scheme implementation:
At first, develop a kind of both anti-muriatic stress corrosion, have the very strong 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 0Cr13Ti (Nb) RE, commercial code RT360.A. the content owing to austenite former Ni in the steel is extremely low, so 0Cr13Ti (Nb) RE belongs to pure iron
Plain body 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≤Ti≤
0.80％。Xiang Gangzhong adds Ti (or Nb), and the carbide, the nitride that contain chromium in the steel are transferred
Form carbide, the nitride of titaniferous, carbon and nitrogen are played static stabilization, and the refinement ferrite is not
The crystal grain of rust steel.C. in composition design, add rare earth (RE) and be the outstanding feature of the technical program, the adding of rare earth
Be to control form, size and the quantity of steel inclusion, up to the present domestic also not not
The precedent that adds rare earth in the rust steel.Since rare earth (RE) can with low-melting-point metal and the Fei Jin in the steel
Genus composition S, O, N, C, Si have great affinity interaction, can control the folder in the steel effectively
The form of foreign material and size, pure steel, the corrosion resistance and the impact flexibility of raising steel.Rare
The ability of soil desulfurization and deoxidation and calcium magnesium seemingly and can be controlled the field trash of oxygen and sulphur in the steel effectively
Form, size and quantity.
Use commercial code RT360, promptly 0Cr13Ti (Nb) RE steel tubing is made the parent tube (3-1) of air cooler finned tube, with the stress corrosion of chloride and sulfide in the opposing medium.In order to prevent to produce too much carbide Cr at weld heat-affected zone
23C
6And Cr
2N, form the poor Cr of weld metal zone, therefore, the welding material of 0Cr13Ti (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.
Be described further below in conjunction with diagram:
Fig. 1: be air cooler, wherein part 1 is a bobbin carriage, and part 2 is the frame of rectifying, and part 3-0 is a finned tube.
Fig. 2: be finned tube 3-0, wherein 3-1 is a parent tube, and 3-2 is the aluminium fin.
Among the figure, the parent tube 3-1 of finned tube 3-0 is the seamless steel pipe of 0Cr13Ti (Nb) RE, and aluminium fin 3-2 is a commercial-purity aluminium.
0Cr13Ti of the present invention (Nb) RE air cooler is compared with 18-8 austenitic stainless steel air cooler, by The alloying element that does not have the counter stress corrosion-susceptible in Composition Design, the counter stress corrosion has congenital The ability of exempting from service, thereby have fairly good proof stress corrosive nature. Simultaneously, because Gao Ge in the steel, its Anti-general corrosion performance is also comparatively superior. The total cost of 0Cr13Ti (Nb) RE air cooler equipment is lower than The 18-8 austenitic stainless steel, and can overcome the insoluble stress corrosion of 18-8 austenitic stainless steel institute Harm has boundless market prospects. The present invention can be widely used in oil, chemical industry, electric power Etc. industry.
Claims (3)
1. ferrite stainless air-conditioner capable, it is by bobbin carriage 1, the frame 2 of rectifying, finned tube 3-0 constitutes, and it is characterized in that: the parent tube 3-1 of the finned tube 3-0 that air cooler is used adopts ferritic stainless steel 0Cr13Ti (Nb) RE tubing to make.
2. as claims 1 described ferrite stainless air-conditioner capable, it is characterized in that: the chemical composition (%) of ferritic stainless steel 0Cr13Ti (Nb) RE tubing is: C≤0.06; Si≤0.60; Mn≤0.80; Cr:11.0-15.0; Ni≤0.25; Cu≤0.25; Ti (Nb): 5 * C≤0.80; S≤0.025; P≤0.030; RE addition≤0.20; Surplus is iron (Fe).
3. as claims 1 described ferrite stainless air-conditioner capable, it is characterized in that: welding material welds with super-low carbon stainless steel welding wire 308L (H00Cr20Ni10) or H00Cr18Ni12Mo2, argon arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01138315 CN1367367A (en) | 2001-12-18 | 2001-12-18 | Ferritic stainless steel air-cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01138315 CN1367367A (en) | 2001-12-18 | 2001-12-18 | Ferritic stainless steel air-cooling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1367367A true CN1367367A (en) | 2002-09-04 |
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ID=4674521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01138315 Pending CN1367367A (en) | 2001-12-18 | 2001-12-18 | Ferritic stainless steel air-cooling device |
Country Status (1)
| Country | Link |
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| CN (1) | CN1367367A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416185C (en) * | 2007-02-13 | 2008-09-03 | 上海交通大学 | Tube bundle belt-type heat exchanger |
| CN105397437A (en) * | 2015-12-24 | 2016-03-16 | 常熟市欧迪管业有限公司 | Titanium tube for heat exchanger |
| CN105499943A (en) * | 2015-12-24 | 2016-04-20 | 常熟市欧迪管业有限公司 | Titanium pipe for heat exchange equipment |
-
2001
- 2001-12-18 CN CN 01138315 patent/CN1367367A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416185C (en) * | 2007-02-13 | 2008-09-03 | 上海交通大学 | Tube bundle belt-type heat exchanger |
| CN105397437A (en) * | 2015-12-24 | 2016-03-16 | 常熟市欧迪管业有限公司 | Titanium tube for heat exchanger |
| CN105499943A (en) * | 2015-12-24 | 2016-04-20 | 常熟市欧迪管业有限公司 | Titanium pipe for heat exchange equipment |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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