CN102345068A - Antibacterial and corrosion resistant thermal fin for stainless steel radiator - Google Patents
Antibacterial and corrosion resistant thermal fin for stainless steel radiator Download PDFInfo
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- CN102345068A CN102345068A CN2011101748463A CN201110174846A CN102345068A CN 102345068 A CN102345068 A CN 102345068A CN 2011101748463 A CN2011101748463 A CN 2011101748463A CN 201110174846 A CN201110174846 A CN 201110174846A CN 102345068 A CN102345068 A CN 102345068A
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Abstract
The invention relates to an antibacterial and corrosion resistant thermal fin for a stainless steel radiator. The thermal fin is characterized by comprising the following materials of 0.01-0.05wt% of C, 0.30-0.75wt% of Si, 0.30-0.60wt% of Mn, 18.5-27.5wt% of Ni, 0.03-0.06wt% of N, 0.30-0.75wt% of Co, 0.10-0.35wt% of Cu, 0.20-0.35wt% of Zn and the balance of Fe and inevitable impurities. A thermotube of the stainless steel radiator of the invention has enough high corrosion resistant performance and intensity as well as good antibacterial effect.
Description
Technical field
The present invention relates to a kind of radiator fin, the present invention relates to a kind of stainless steel heat radiator radiator element specifically, it has antibiotic anti-corrosion effect.
Background technology
Heat exchanger, interchanger, radiator element etc. contain higher chromium content with stainless material; This steel is at high temperature oxidized; Form the thin oxide film of one deck on their surfaces, it is very fine and close and stable, thereby has prevented the deep and thorough diffusion of oxygen and the continuation oxidation on steel surface.Heat exchanger, interchanger, radiator element etc. contain the chromium and the nickel of high level with stainless-steel seamless pipe; Chromium and nickle atom size and iron atom size are variant; High-load chromium and nickel distort lattice; Tissue is strengthened; And higher recrystallization temperature is arranged, make steel that higher high temperature strength arranged.
On the other hand, in many interchanger products and equipment, all use the chloride liquid of seawater form to be used to cool off purpose as heat-eliminating medium.Owing to, in these interchanger, use muriate liquid that the material that uses has been proposed high requirement because of the high corrosive environment that muriate produces.
Intergranular corrosion has constituted and utilizes seawater as the subject matter in the plate-type heat exchanger of cooling fluid; Because possibly can't avoid such situation: the present position of linkage interface makes seawater can arrive crack or the seam crossing that forms thus between the adjacent panels between the interchanger adjacent panels; And they also are positioned at the position that cooling fluid has relatively-high temperature, and this also is dangerous.Intergranular corrosion problem in the plate-type heat exchanger can be alleviated through said plate is welded to one another and through sealing they is connected to each other, but through these measures said problem is disappeared.
The intergranular corrosion that damages material is that temperature relies on; And when the material that is used for given cooling fluid (being seawater in this case) has the temperature of subcritical crack temperature; Basically what can not take place; But when the temperature of this material rises to above this temperature; This material will also can damage connection at short notice very strongly in the corrosion at place, said crack, and this makes that the temperature that surpasses said critical crack temperature is unacceptable.Use in the plate-type heat exchanger of cooling fluid (like seawater) as heat-eliminating medium of chloride, this intergranular corrosion temperature should be at least 50 ℃, preferably at least 60 ℃, is used to provide interchanger acceptable cooling power.Thereby the seawater that uses in the plate-type heat exchanger can be chlorinated kill microorganisms.If these microorganisms are not killed through for example chlorination, their existence will cause the increase of corrosiveness of the environment so.Promptly about below 40 ℃ at low temperature, chlorination itself can not cause the corrodibility of any increase for for example stainless steel.And surpassing under 40 ℃ the temperature, the redox potential increase that is caused by chlorination has seriously increased the corrodibility of water for rust staining and intergranular corrosion, has therefore limited to be used for interchanger useful configuration material chosen.In foreword, limit plate-type heat exchanger (cooling fluid (such as seawater) of promptly utilizing chloride is as heat-eliminating medium) type, that be used for use under comparatively high temps; Owing to this reason is almost special up to now the plate that is made of titanium is set, this plate has the critical crack temperature above 80 ℃ in seawater.Yet titanium is that very expensive material and it also are not easy to obtain.
Summary of the invention
Above-mentioned purpose in view of the stainless heat exchanger that uses in the prior art exists the purpose of this invention is to provide a kind of stainless steel heat radiator radiator element, has sufficiently high corrosion resisting property, and has the antimicrobial effect.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of antibiotic anti-corrosion stainless steel heat radiator radiator element is characterized in that it and is processed by the following material of forming;
C:0.01-0.05 wt%, Si:0.30-0.75 wt%, Mn:0.30-0.60 wt%, Ni:18.5-27.5 wt%, N:0.03-0.06 wt%, Co:0.30-0.75 wt%, Cu:0.10-0.35 wt%, Zn:0.20-0.35 wt%, surplus is that Fe and unavoidable impurities constitute.
The meaning and the qualification reason of the alloying constituent of stainless material of the present invention are described below.
C：
Carbon is austenite former, can improve the hardenability and the intensity of steel, and C content is crossed to hang down and can be caused the hardness of steel not reach service requirements; Yet the C too high levels is easy to form austenite, thereby can reduce the corrosion resistance nature of steel, and causes hot strength to reduce.In ferritic stainless steel of the present invention, the content that limits C is between 0.01-0.05 wt%.The content of preferred C is 0.01-0.03 wt%.
Si：
In steel is made, be used as reductor, and it has increased the flowability of manufacturing and weld period.In addition, Si improves hot properties and resistance to oxidation corrosive beneficial element; It also helps and improves the intensity of steel in middle hot environment.Yet in stainless steel of the present invention,, can cause excessively separating out of intermetallic compound, the raising of intensity under the hot environment in being unfavorable on the contrary if Si content surpasses 0.75wt%.And if its content may produce the tendency of abnormal oxidation when being lower than 0.30wt%.Therefore its content is limited to 0.30-0.75 wt% in the present invention, and preferred its content range is 0.35-0.60 wt%.
Mn：
In steel is made, be used as reductor, and it has increased the flowability of manufacturing and weld period.And the adding of Mn helps crystal grain thinning, improves firm intensity, adds an amount of Mn and helps improving Corrosion Resistance of Stainless Steels.But carry in the plain body stainless steel of the present invention,, can form a large amount of intermetallic compounds, cause stainless processability to reduce, and bring out intergranular corrosion easily when the content of Mn surpasses 0.60wt%.Therefore its content is limited to 0.30-0.60 wt% in the present invention, and preferably its content range is 0.35-0.45 wt%.
Ni：
Be used to improve the active element of material erosion resistance.And be ferrite former.Thereby in order to improve erosion resistance, expectation keeps high as far as possible Ni content.In addition, high Ni content also helps improving the resistance to elevated temperatures of stainless material.In order to obtain good anti-corrosion, the content of Ni should be at least 18.5 wt% in material of the present invention.Yet high-load Ni has increased the cost of stainless material, and too high in addition Ni content can cause Drawing abillity to descend and causes the toughness deterioration, thereby the content that limits Ni in the present invention is between 18.5-27.5wt%.Preferably, the content of Ni is at 18.5-23.5 wt%.
N：
The adding of N can increase the erosion resistance of material, simultaneously can suppress high temperature oxidation and is favourable to the hot strength that solution strengthening brings.But when the add-on of N surpassed 0.06wt%, hot strength reduced in will causing.Thereby the scope of N is defined as 0.03-0.06 wt% in the application.Preferably, the content of N is 0.03-0.05 wt% in the present invention.
Co：
The adding of Co can improve the hardening capacity of steel to a certain extent, increases the intensity of steel, but when its content surpasses 0.75wt%, causes stainless toughness to reduce, and then cause stainless cold-forming property to reduce.Thereby in stainless steel of the present invention, its content is defined as 0.30-0.75 wt%.Preferably, its content is 0.35-0.60 wt%.
Cu：
The adding of Cu can improve the hardening capacity of steel to a certain extent, increases the intensity of steel, adds a spot of Cu in addition, can also increase stainless germ resistance of the present invention.But when its content surpasses 0.35wt%, cause stainless toughness to reduce in the present invention, and then cause stainless cold-forming property to reduce.And its content is when being lower than 0.10wt%, and its antibacterial effect is not satisfactory again.Thereby in stainless steel of the present invention, its content is defined as 0.10-0.35 wt%.Preferably, its content is 0.10-0.25 wt%.
Zn
Zn is a kind of good sterilization antimicrobial element that has, and the Zn that in alloy of the present invention, adds more than 0.20 wt% promptly can play good antibiotic and sterilizing effect.But when the content of Zn surpasses 0.35 wt%, stainless hardness and intensity will have a declining tendency, and possibly cause corrosion proof decline in alloy of the present invention.In the present invention its content is defined as 0.20-0.35 wt%.
On the other hand; The invention also discloses a kind of method of manufacture of above-mentioned antibiotic anti-corrosion stainless steel heat radiator radiator element; It may further comprise the steps: the component of pressing above-mentioned stainless material is with induction furnace melting or arc melting; Through argon oxygen decarburizing process or vacuum oxygen decarburization process refinery practice, become strand through continuous casting; Again through hot rolling, thermal treatment then, wherein, annealing: Heating temperature is 700-870 ℃, below the insulation back slow cooling to 250 ℃; Normalizing: Heating temperature is 850-1050 ℃, and the insulation back is cooled to room temperature in air.Described stainless material is through cold working and/or hot-work and/or casting, and prior aries such as for example forging, hot pressing, clod wash processing are processed into described stainless steel heat radiator radiator element.
Stainless material of the present invention is observed its metallographic structure, and crystal grain is tiny and evenly beneficial to the solidity to corrosion that improves material; Intergranular corrosion resistance is good, and the probability that spot corrosion takes place is also very little, and its tensile strength is greater than 450 MPa; In addition; Stainless material resistance toheat of the present invention is good; Its processing characteristics is good; And has good antibacterial property; The stainless material process JIS Z2801-200 test of preparation is shown that stainless steel heat radiator radiator element of the present invention reaches more than 99% the antibiotic rate of intestinal bacteria, streptococcus aureus.
Embodiment
Following the present invention will combine concrete embodiment that the present invention is done further explanation and explanation.
Press the shown mass percent of table 1, adopt the component induction furnace melting of above-mentioned stainless material,, become strand through continuous casting through the vacuum oxygen decarburization process refinery practice; Again through hot rolling, thermal treatment then, wherein, annealing: Heating temperature is 800 ℃, below the insulation back slow cooling to 250 ℃; Normalizing: Heating temperature is 1000 ℃, and the insulation back is cooled to room temperature in air.Described stainless material is through cold working and/or hot-work and/or casting, and prior aries such as for example forging, hot pressing, clod wash processing are processed into described stainless steel heat radiator radiator element.
The chemical ingredients of table 1 mother metal (surplus is Fe)
| Numbering | C | Si | Mn | Ni | N | Co | Cu | Zn |
| 1 | 0.01 | 0.30 | 0.30 | 18.5 | 0.03 | 0.30 | 0.10 | 0.20 |
| 2 | 0.02 | 0.37 | 0.35 | 20.0 | 0.03 | 0.37 | 0.15 | 0.20 |
| 3 | 0.03 | 0.45 | 0.40 | 21.5 | 0.04 | 0.45 | 0.15 | 0.25 |
| 4 | 0.03 | 0.52 | 0.45 | 23.5 | 0.05 | 0.58 | 0.20 | 0.25 |
| 5 | 0.04 | 0.60 | 0.55 | 25.5 | 0.05 | 0.65 | 0.25 | 0.30 |
| 6 | 0.05 | 0.75 | 0.60 | 27.5 | 0.06 | 0.75 | 0.35 | 0.35 |
The stainless material that obtains is carried out following Performance Detection
Strength of materials test
In order to measure tensile strength, the material that will pass through at normal temperatures after the cold working carries out standard tensile test, the tensile strength of test material.Person between the tensile strength 450 MPa-500 MPa is evaluated as very, and it is bad to be lower than being evaluated as of 450 MPa, and it is excellent to surpass being evaluated as of 500 MPa.
Corrosion-resistant and the antibacterial test of material
Size with 50 * 50 mm cuts out sample respectively, carries out the test of salt-fog test (SWAAT test) and JIS Z2801-2000 anti-microbial property.The corrosion test time set is 800 hours, material surface do not have the degree of depth surpass 0.2 mm corrosion pit, be evaluated as very, it is poor to have the sample of the corrosion pit that surpasses 0.2 mm to be evaluated as corrodibility, does not have obvious corrosion pit, is evaluated as excellent.
The test strain of antibacterial test is intestinal bacteria and streptococcus aureus.
Detection method is:
(1) sample is cut into the big or small size of 50.0 * 50.0 mm, sterilization (in triplicate).
(2) on sample, drip some milliliters of bacterium liquid, make colony number maintain 10
5
(3) plastics film is covered specimen surface, put into aseptic plate then, in 36 ± 1 ℃ of constant incubators, cultivate after 24 hours, viable bacteria is counted.
(4) with the ferritic stainless steel of the not argentiferous same model of comparative example 1 as control sample, repeat aforesaid operations.
Antibiotic rate adopts by antibiotic rate=[(A-B)/A] * 100%, in the formula: the average viable count of control sample after A-24 hour; Antibiotic sample average viable count after B-24 hour.Calculate.
Table 2: sample tensile strength, solidity to corrosion and antibacterial effect
| Specimen coding | Tensile strength | SWAAT test 800 hours | Antibiotic rate |
| 1 | Very | Very | >99% |
| 2 | Excellent | Excellent | >99% |
| 3 | Excellent | Excellent | >99% |
| 4 | Excellent | Excellent | >99% |
| 5 | Excellent | Excellent | >99% |
| 6 | Very | Very | >99% |
Claims (8)
1. an antibiotic anti-corrosion stainless steel heat radiator radiator element is characterized in that it and is processed by the following material of forming;
C:0.01-0.05 wt%, Si:0.30-0.75 wt%, Mn:0.30-0.60 wt%, Ni:18.5-27.5 wt%, N:0.03-0.06 wt%, Co:0.30-0.75 wt%, Cu:0.10-0.35 wt%, Zn:0.20-0.35 wt%, surplus is that Fe and unavoidable impurities constitute.
2. the described stainless steel heat radiator radiator element of claim 1, the content that it is characterized in that C is 0.01-0.03 wt%.
3. the described stainless steel heat radiator radiator element of claim 1, the content that it is characterized in that Si is 0.35-0.60 wt%.
4. the described stainless steel heat radiator radiator element of claim 1, the content that it is characterized in that Ni is 18.5-23.5 wt%.
5. the described stainless steel heat radiator radiator element of claim 1, the content that it is characterized in that Mn is 0.35-0.45 wt%.
6. the described stainless steel heat radiator radiator element of claim 1, the content that it is characterized in that N is 0.03-0.05 wt%.
7. the described stainless steel heat radiator radiator element of claim 1, the content that it is characterized in that Co is 0.35-0.60 wt%.
8. the described stainless steel heat radiator radiator element of claim 1, the content that it is characterized in that Cu is 0.10-0.25 wt%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101748463A CN102345068A (en) | 2011-06-27 | 2011-06-27 | Antibacterial and corrosion resistant thermal fin for stainless steel radiator |
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| CN2011101748463A CN102345068A (en) | 2011-06-27 | 2011-06-27 | Antibacterial and corrosion resistant thermal fin for stainless steel radiator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107119233A (en) * | 2017-05-27 | 2017-09-01 | 太仓源壬金属科技有限公司 | A kind of auto parts and components nickel alloy material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498981A (en) * | 2002-11-07 | 2004-05-26 | 中国科学院金属研究所 | Antibacterial stainless steel of ferrite in nano precipitated phase |
| CN1948540A (en) * | 2005-10-14 | 2007-04-18 | 辽宁国瑞商贸有限公司 | Ferrite stainless steel having excellent antibacterial characteristics |
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- 2011-06-27 CN CN2011101748463A patent/CN102345068A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498981A (en) * | 2002-11-07 | 2004-05-26 | 中国科学院金属研究所 | Antibacterial stainless steel of ferrite in nano precipitated phase |
| CN1948540A (en) * | 2005-10-14 | 2007-04-18 | 辽宁国瑞商贸有限公司 | Ferrite stainless steel having excellent antibacterial characteristics |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107119233A (en) * | 2017-05-27 | 2017-09-01 | 太仓源壬金属科技有限公司 | A kind of auto parts and components nickel alloy material |
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Application publication date: 20120208 |