CN108728759A - A kind of austenite antimicrobial stainless steel applied to food-processing industry field - Google Patents
A kind of austenite antimicrobial stainless steel applied to food-processing industry field Download PDFInfo
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- CN108728759A CN108728759A CN201810297364.9A CN201810297364A CN108728759A CN 108728759 A CN108728759 A CN 108728759A CN 201810297364 A CN201810297364 A CN 201810297364A CN 108728759 A CN108728759 A CN 108728759A
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- stainless steel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
Abstract
The purpose of the present invention is to provide a kind of austenite antimicrobial stainless steel, chemical composition is (mass percent)：C：≤0.03；Si：0.3-0.6；Mn：0.3-0.8；S：≤0.01；P：≤0.01；N：≤0.02；Cr：17.5-19；Ni：7.5-8.5；Cu：3.0-4.5；Ga：0.2-3.0；Surplus is Fe.Fe is precipitated in austenite stainless steel matrix by special heat treatment by adding Ga elements in austenite stainless steel matrix3Ga interphases, to assign material quick sterilization and the anti-microbial property under high bacterial concentration.The stainless steel can be applied to the stainless steel products that food-processing industry is related to, the problems such as to reduce in food processing process the bacterium infection that may cause.
Description
Technical field
The present invention relates to stainless steel fields, and in particular to a kind of austenite antimicrobial stainless steel with excellent antibacterial function,
By adding Ga elements in stainless steel base, makes material that there is quick and strong sterilizing function, can be applied to food and add
Work industrial circle, such as the related stainless steel products of food processing container, pipeline.
Background technology
In daily life, bacterium is ubiquitous, and the various diseases caused by bacterium seriously endanger people's health.According to
Statistics only causes disease that dead number is caused to be as high as 17,000,000 people in nineteen ninety-five by bacterium infection.With the development of society
With the raising of people's economic life level, environment and own health arround people couple are increasingly paid close attention to, anti-bacteria stainless steel also because
This becomes the hot spot researched and developed at present.The research and development of anti-bacteria stainless steel start from the last century 90's, and in the world, Japan opens first
Have issued the anti-bacteria stainless steel with excellent antibacterial performance.At 2000 or so, the country also begin to novel antibacterial stainless steel into
Row research and development.Anti-bacteria stainless steel refers to the new type stainless steel. corrosion resistance for itself having excellent anti-bacterium capability, by being added in stainless steel base
It is excellent can to assign material by special heat treatment for metallic element with antibacterial action, such as copper (Cu), silver-colored (Ag)
Anti-microbial property.
For at present, the main Research Thinking of austenite antimicrobial stainless steel is that tool is added in austenite stainless steel matrix
There are the elements such as the Cu and Ag of bactericidal effect.As Publication No. CN1504588, CN1401808 and CN102127718 patent in,
It discloses and adds a certain amount of Cu elements in stainless steel base, it, can be in stainless steel base by corresponding ageing treatment
The a large amount of copper-rich phase of disperse educt, and then obtain the austenite antimicrobial stainless steel with good anti-microbial property；In another example open
Number for CN101230438, CN102965585 and CN101029375 patent in, by a certain amount of Cu and Ag elements, with centre
The mode of alloy or simple metal is added in austenite stainless steel matrix, has been prepared the austenite for having excellent bactericidal property and has been resisted
Bacterium stainless steel.
In summary, existing austenite antimicrobial stainless steel mainly adds a certain amount of Cu or Ag elements in the base,
But since the addition of high level Cu or Ag element is unfavorable to processing technologys such as the hot forgings of austenitic stainless steel, this therefore can not
Ensure antibiotic property of the material under high bacterial concentration.
Therefore, the present invention has researched and developed a kind of novel austenite antimicrobial stainless steel, innovative by gallium (Ga) element
It is added in austenitic stainless steel, by special heat treatment, material is made to have quick sterilization and in high bacterial concentration
Under anti-microbial property.
Invention content
The purpose of the present invention is to provide a kind of novel austenite antimicrobial stainless steels, are innovatively added to Ga elements
In austenite stainless steel matrix, by special thermal treatment, Fe is precipitated in austenite stainless steel matrix3Ga interphases are improving
The mechanical property of material is simultaneously, also the same to assign material quick sterilization and the anti-microbial property under high bacterial concentration.This is not
Rust steel can be applied to the stainless steel products that food-processing industry is related to, and reduce the bacterium that may cause in food processing process
The problems such as infection.
Technical solution of the present invention is as follows：
A kind of austenite antimicrobial stainless steel adds suitable Ga elements on the basis of 304L austenitic stainless steels, this is not
The chemical composition of rust steel is following (wt.%), C：≤0.03；Si：0.3-0.6；Mn：0.3-0.8；S：≤0.01；P：≤0.01；N：
≤0.02；Cr：17.5-19；Ni：7.5-8.5；Cu：3.0-4.5；Ga：0.2-3.0；Surplus is Fe.As preferred technical side
Case：The ranging from Ga of Ga elements：0.6-1.8 (wt.%).
In the composition design of the austenite antimicrobial stainless steel of the present invention, Ga is most important alloying element, this is to ensure not
Rust steel has the necessary condition of anti-microbial property, and the main innovation point of the present invention under high bacterial concentration.Ga elements are mainly answered
For semicon industry, 80% of aggregate consumption or more is accounted for.In the present invention, it is normal new old that Ga ions can upset bacterium
Bacterium is killed in metabolism.Metal Ga is a kind of high boiling metal of low melting point, 2204 DEG C of boils up till, so high boiling point
A kind of alloying element for enabling Ga to be smelted as steel.There are Fe-Ga binary phase diagramls it is found that maximum of the Ga elements in γ-Fe is solid
Solubility is 3.25at.%, and the solid solubility of Ga changes with the difference of temperature, and the variation of solid solubility has also promoted Ga
Element can be precipitated by ageing treatment in the form of the second phase, and the precipitation of the second phase containing Ga can not only be to the mechanical property of material
It can have an impact, equally also give its strong sterilization idiocratic.
The present invention also provides the heat treatment methods of above-mentioned austenite antimicrobial stainless steel, are dissolved first at 1030-1080 DEG C
0.5-1h is handled, in the base, after water cooling to room temperature, the Ga in stainless steel is first for the solid solution for keeping the Ga in stainless steel full and uniform
Element is in oversaturated state.Later in 580-720 DEG C of ageing treatment 2-6h, it is air-cooled to room temperature, the Ga elements of hypersaturated state
Fe can be precipitated from stainless steel base3The second phases of Ga.When in the environment or liquid that the stainless steel containing the second phase is in moist
When, Ga3+Ion can be dissolved out from stainless steel surface, to assign stainless steel excellent anti-microbial property.
The present invention also provides the preparation methods of above-mentioned austenite antimicrobial stainless steel, it is characterised in that：In vaccum sensitive stove
Middle melting, the techniques such as cast, forging, hot rolling, cold rolling, pickling, antibacterial heat-treatment method can carry out after hot rolling treatment.
The beneficial effects of the invention are as follows：
The present invention innovatively proposes the addition Ga elements in existing common austenite stainless steel matrix, has devised
A kind of austenite antimicrobial stainless steel having quick sterilization and strong sterilizing ability.By regulating and controlling in steel the content of Ga elements and corresponding
Heat treatment, make to be precipitated in austenite stainless steel matrix largely with strong sterilizing ability Fe3Ga interphases assign material
Excellent anti-microbial property.
Description of the drawings
Fig. 1 is for embodiment in the present invention from comparative example in different incubation times, bacterial concentration 105To large intestine under CFU/ml
The anti-bacterial result of bacillus.
Specific implementation mode
Embodiment：Embodiment 1-7 is anti-bacteria stainless steel of the present invention, and chemical composition is shown in Table 1.By melting, forging, heat
1mm heavy-gauge sheetings are processed into forging, hot rolling and cold rolling.Antibacterial heat-treatment is carried out again, solid solubility temperature is 1050 DEG C, solution time 1h,
Aging temp is 650 DEG C, aging time 4h.
Comparative example：Comparative example 1 is common austenite antimicrobial stainless steel, and comparative example 2 is that the antibacterial containing micro Ga elements is stainless
Steel, comparative example 3 are the anti-bacteria stainless steel containing a large amount of Ga elements, and chemical composition is shown in Table 1, specific treatment process and embodiment phase
Together.
1 embodiment and comparative example material chemical composition (wt.%) of table
| Material | C | Si | P | S | N | Mn | Cr | Cu | Ni | Ga |
| Embodiment 1 | 0.022 | 0.41 | 0.006 | 0.004 | 0.012 | 0.6 | 18.3 | 3.7 | 7.8 | 0.2 |
| Embodiment 2 | 0.019 | 0.42 | 0.007 | 0.002 | 0.010 | 0.5 | 18.3 | 3.1 | 8.1 | 0.4 |
| Embodiment 3 | 0.023 | 0.39 | 0.005 | 0.008 | 0.008 | 0.7 | 18.5 | 3.3 | 8.0 | 0.6 |
| Embodiment 4 | 0.019 | 0.51 | 0.005 | 0.007 | 0.009 | 0.5 | 17.8 | 3.5 | 8.5 | 1.0 |
| Embodiment 5 | 0.024 | 0.48 | 0.006 | 0.005 | 0.013 | 0.6 | 17.6 | 3.9 | 7.9 | 1.8 |
| Embodiment 6 | 0.019 | 0.38 | 0.005 | 0.006 | 0.007 | 0.5 | 18.2 | 3.8 | 8.1 | 2.5 |
| Embodiment 7 | 0.025 | 0.42 | 0.007 | 0.001 | 0.011 | 0.7 | 18.1 | 3.2 | 8.0 | 3.0 |
| Comparative example 1 | 0.018 | 0.41 | 0.009 | 0.006 | 0.011 | 0.6 | 18.4 | 3.5 | 7.9 | - |
| Comparative example 2 | 0.022 | 0.35 | 0.008 | 0.005 | 0.008 | 0.7 | 18.2 | 3.4 | 8.1 | 0.1 |
| Comparative example 3 | 0.017 | 0.53 | 0.007 | 0.008 | 0.009 | 0.5 | 17.8 | 3.1 | 8.2 | 3.5 |
(1) anti-microbial property detects
According to " JIS Z 2801-2000《Antibacterial fabricated product-antibiotic property test method and antibacterial effect》,GB/T
2591-2003《Antibiotic plastic anti-microbial property experimental method and antibacterial effect》" etc. correlation standards, quantitative test table 1 institute
Show the sterilizing rate after multicomponent metallic acts on common infection bacterium (such as Escherichia coli, staphylococcus aureus).The sterilization of material
Rate is calculated according to the following equation：
Sterilizing rate (%)=[(control sample viable count-austenite antimicrobial stainless steel viable count)/control sample viable count]
× 100%,
Control sample viable count is that the viable count after Bacteria Culture, Ovshinsky are carried out on common 304L austenite stainless steel sample
Body anti-bacteria stainless steel viable count refers to that the austenite antimicrobial stainless steel after heat treatment carries out the viable count after Bacteria Culture.
2 illustrated embodiment of table and comparative example co-cultured under different bacterium concentration for 24 hours afterwards to Escherichia coli the anti-bacterial result with
And bacterial concentration is 10 under different incubation times5To Escherichia coli the anti-bacterial result when CFU/ml.It can be found from table, Ga elements
Addition play the role of to the bactericidal properties under the quick sterilization and high bacterial concentration of steel it is very important.When Ga contents are higher than
When 0.6wt.%, material all has excellent anti-microbial property under shorter incubation time and high bacterial concentration.
2 embodiment of table and comparative example the anti-bacterial result
(2) corrosion resistance
According to stainless steel pitting potential measurement method (GB/T 17899-1999) and salt spray test method (GB/T 10125-
2012) corrosion-resistant ability has been carried out to the embodiment of the present invention and comparative example material and salt air corrosion is tested, wherein salt air corrosion is
Neutral salt spray corrosion test (NSS experiments), testing liquid are 5%NaCl solution, and between 6.5-7.2, test temperature is pH value
25 DEG C ± 2 DEG C, test period 200h.Test result is shown in Table 3.It can be found by data in table, when Ga element additive amounts are higher
(comparative example 3), the corrosion-resistant ability and salt air corrosion appearance of material decline rapidly, and with the antibacterial austenite of the preferably amount containing Ga
The salt air corrosion appearance and comparative example of stainless steel are without significant change, and the pitting resistance of material also slightly increases.
Resistance to spot corrosion and salt air corrosion performance result of 3 embodiment of table with comparative example material
| Material | Pitting potential (mv) | Salt air corrosion appearance is graded |
| Embodiment 1 | 285 | A grades-unchanged |
| Embodiment 2 | 298 | A grades-unchanged |
| Embodiment 3 | 297 | A grades-unchanged |
| Embodiment 4 | 292 | A grades-unchanged |
| Embodiment 5 | 285 | A grades-unchanged |
| Embodiment 6 | 240 | The B grades of slight discolorations for arriving moderate |
| Embodiment 7 | 230 | C grades of extremely slight loss of gloss |
| Comparative example 1 | 265 | A grades-unchanged |
| Comparative example 2 | 275 | A grades-unchanged |
| Comparative example 3 | 205 | D grades of extremely slight corrosion products |
In conclusion a certain amount of Ga elements are added on the basis of existing austenitic stainless steel, at specific heat
Reason operation, can assign material quick sterilization and the anti-microbial property under high bacterial concentration.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of austenite antimicrobial stainless steel applied to food-processing industry field, it is characterised in that：304L austenites not
Suitable gallium element is added on the basis of rust steel, chemical composition is mass percent：C：≤0.03；Si：0.3-0.6；Mn：
0.3-0.8；S：≤0.01；P：≤0.01；N：≤0.02；Cr：17.5-19；Ni：7.5-8.5；Cu：3.0-4.5；Ga：0.2-
3.0；Surplus is Fe.
2. according to austenite antimicrobial stainless steel described in claim 1, it is characterised in that：The ranging from Ga of Ga elements：0.6-
1.8wt.%.
3. a kind of antibacterial heat-treatment method of austenite antimicrobial stainless steel described in claims 1 or 2, it is characterised in that：In 1030-
1080 DEG C of heat preservation 0.5-1h, water cooling to room temperature are air-cooled to room temperature later in 580-720 DEG C of ageing treatment 2-6h.
4. the preparation method of austenite antimicrobial stainless steel described in a kind of claims 1 or 2, it is characterised in that：The antibacterial is stainless
Steel melting in vaccum sensitive stove carries out at arbitrary processing technology after hot rolling by casting, forging, hot rolling, cold rolling, pickling
Antibacterial heat-treatment.
5. a kind of application of the stainless steel obtained according to heat treatment method described in claim 3, it is characterised in that：The austenite is anti-
Bacterium stainless steel is used to prepare the stainless steel products in food-processing industry field.
6. according to food processing container described in claim 5, the application of stainless steel, it is characterised in that：The food-processing industry
The stainless steel products in field is food conduit.
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| CN201810297364.9A CN108728759B (en) | 2018-04-04 | 2018-04-04 | Austenitic antibacterial stainless steel applied to field of food processing industry |
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| CN201810297364.9A CN108728759B (en) | 2018-04-04 | 2018-04-04 | Austenitic antibacterial stainless steel applied to field of food processing industry |
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| CN108728759A true CN108728759A (en) | 2018-11-02 |
| CN108728759B CN108728759B (en) | 2019-12-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112442640A (en) * | 2019-08-30 | 2021-03-05 | 苏州森锋医疗器械有限公司 | Martensitic stainless steel, tool and preparation and heat treatment method of martensitic stainless steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1504588A (en) * | 2002-12-04 | 2004-06-16 | 中国科学院金属研究所 | Austenic antibiotic stainless steel |
| JP2017014538A (en) * | 2015-06-26 | 2017-01-19 | 新日鐵住金ステンレス株式会社 | Austenitic stainless steel sheet for exhaust component excellent in heat resistance and surface smoothness and manufacturing method therefor |
-
2018
- 2018-04-04 CN CN201810297364.9A patent/CN108728759B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1504588A (en) * | 2002-12-04 | 2004-06-16 | 中国科学院金属研究所 | Austenic antibiotic stainless steel |
| JP2017014538A (en) * | 2015-06-26 | 2017-01-19 | 新日鐵住金ステンレス株式会社 | Austenitic stainless steel sheet for exhaust component excellent in heat resistance and surface smoothness and manufacturing method therefor |
Non-Patent Citations (1)
| Title |
|---|
| 马超: "无机镓化合物抗菌性能研究", 《中国优秀硕士学位论文全文数据库 医药卫生科技辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112442640A (en) * | 2019-08-30 | 2021-03-05 | 苏州森锋医疗器械有限公司 | Martensitic stainless steel, tool and preparation and heat treatment method of martensitic stainless steel |
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| CN108728759B (en) | 2019-12-27 |
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