CN108728767B - Antibacterial stainless steel for handrails or handles - Google Patents
Antibacterial stainless steel for handrails or handles Download PDFInfo
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- CN108728767B CN108728767B CN201810299880.5A CN201810299880A CN108728767B CN 108728767 B CN108728767 B CN 108728767B CN 201810299880 A CN201810299880 A CN 201810299880A CN 108728767 B CN108728767 B CN 108728767B
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- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 115
- 239000010935 stainless steel Substances 0.000 title claims abstract description 78
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 78
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 8
- 241000894006 Bacteria Species 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000005242 forging Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 4
- 230000000845 anti-microbial effect Effects 0.000 claims 2
- 238000010891 electric arc Methods 0.000 claims 2
- 238000009749 continuous casting Methods 0.000 claims 1
- 238000007670 refining Methods 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 abstract description 18
- 229910052733 gallium Inorganic materials 0.000 abstract description 11
- 239000006104 solid solution Substances 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 9
- 239000011159 matrix material Substances 0.000 abstract description 7
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000243 solution Substances 0.000 abstract description 6
- -1 gallium ions Chemical class 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 244000052616 bacterial pathogen Species 0.000 abstract 2
- 208000035143 Bacterial infection Diseases 0.000 abstract 1
- 208000022362 bacterial infectious disease Diseases 0.000 abstract 1
- 238000005034 decoration Methods 0.000 abstract 1
- 210000004243 sweat Anatomy 0.000 abstract 1
- 239000010949 copper Substances 0.000 description 34
- 241000588724 Escherichia coli Species 0.000 description 17
- 241000191967 Staphylococcus aureus Species 0.000 description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 150000002500 ions Chemical class 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 6
- 238000010828 elution Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229910001431 copper ion Inorganic materials 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 230000001580 bacterial effect Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000035755 proliferation Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 239000013068 control sample Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000807 Ga alloy Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
The invention discloses antibacterial stainless steel for handrails or handles, and belongs to the technical field of stainless steel materials. The stainless steel comprises the following chemical components (in percentage by weight): c: less than or equal to 0.08; si: less than or equal to 0.50; mn: less than or equal to 1.00; p: less than or equal to 0.05; s: less than or equal to 0.05; ni: 8.0-12.0; cr: 18.0-20.0; cu: 3.0-5.0; ga: 0.50-1.50; the balance being Fe; after the stainless steel is subjected to solution heat treatment, Ga and Cu exist in two forms of a solid solution state and a gallium-rich phase precipitation state by means of supersaturated solid solution of Ga and Cu in a matrix. Because the using environment of the handrail or the handle is generally the air environment, when the handrail or the handle is contacted with sweat, the gallium-rich phase can effectively dissolve out gallium ions, obviously inhibit the propagation and spread of pathogenic bacteria of human hands, and reduce the occurrence probability of mass-produced bacterial infection events. The antibacterial stainless steel reduces the risk of spreading pathogenic bacteria among hands of people, and can be widely applied to stair handrails, door handles and the like for living decoration.
Description
Technical Field
The invention relates to the field of stainless steel materials, and particularly provides antibacterial stainless steel for handrails or handles.
Background
The copper-containing antibacterial stainless steel is characterized in that a copper-rich precipitated phase with a certain volume fraction is precipitated in a high-temperature ageing process, and when the copper-rich phase is contacted with bacteria, a trace amount of copper ions can be released to destroy cell walls of the bacteria, so that the bacteria die. Based on the broad-spectrum antibacterial characteristic of copper element, the copper-containing antibacterial stainless steel can be suitable for various practical use environments. However, the killing of the bacterial flora is directly related to the copper ion elution rate and elution concentration. Generally, the greater the amount of copper added to the steel, the greater the copper-rich precipitate phase, and the greater the copper ion elution rate and elution concentration. When the dissolution concentration is greater than the minimum inhibitory concentration to bacteria, the stainless steel shows a strong antibacterial effect; otherwise, it has no antibacterial property.
On the basis of this, in practical applications, the addition of high copper content to stainless steel would admittedly improve its antibacterial performance, but would have the following disadvantages: (1) the addition of excessive copper content and the precipitation of copper-rich phase can reduce the passive film structure on the surface of the stainless steel, and the passive film becomes loose, which seriously affects the corrosion resistance of the stainless steel. (2) The addition of too high a copper content drastically deteriorates the hot workability. The segregation tendency of the copper element on the interface is increased, the high-temperature hot working crack sensitivity is greatly increased, the material yield is greatly influenced, and the large-scale practical application of the copper element is limited. (3) In the case of the iron-based alloy, the elution of a large amount of iron ions is accompanied by the elution of copper ions. The released iron ions also promote the proliferation of bacteria to some extent, which is also detrimental to the antibacterial efficiency of copper ions. (4) For the specific objects such as handles or handrails, which contact with hands, the processing and manufacturing processes are usually cast, for example, the traditional aging treatment of antibacterial stainless steel is adopted, which undoubtedly increases the process flow and the production cost, and is also disadvantageous to the large-scale popularization of the antibacterial stainless steel.
In steel materials, the melting point of gallium metal is very low, only 29.8 ℃, and the boiling point reaches 2204 ℃. This provides the possibility for its application in ferrous metallurgical processes. In the field of metallic materials, iron-gallium alloys are common magnetostrictive materials. The main effect of gallium in iron is to significantly improve the magnetostrictive property of steel, and no report about the application of gallium in stainless steel is found.
Disclosure of Invention
The invention aims to provide antibacterial stainless steel for handrails or handles, and solves the problem that the existing material has relatively low antibacterial efficiency in the use environment of electrical equipment.
The technical scheme of the invention is as follows:
an antibacterial stainless steel for handrails or handles is characterized in that: the stainless steel comprises the following chemical components in percentage by weight: c: less than or equal to 0.08; si: less than or equal to 0.50; mn: less than or equal to 1.00; p: less than or equal to 0.05; s: less than or equal to 0.05; ni: 8.0-12.0; cr: 18.0-20.0; cu: 3.0-5.0; ga: 0.50-1.50; the balance being Fe.
The preferable technical scheme is that the chemical components are as follows: c: less than or equal to 0.03; si: less than or equal to 0.50; mn: less than or equal to 1.00; p: less than or equal to 0.005; s: less than or equal to 0.005; ni: 8.5-9.5; cr: 18.5-19.5; cu: 3.5-4.5; ga: 0.80-1.20; the balance being Fe.
In the composition design of the stainless steel of the present invention, the alloying element gallium (Ga) is the most important alloying element in the new stainless steel. Ga is a necessary condition for ensuring that the stainless steel has stronger antibacterial efficiency, and is also a main innovation point of the invention. The Ga content of the stainless steel is 0.05-1.50%, and the Ga-rich phase is uniformly dispersed and precipitated in the steel under the condition of ensuring special heat treatment. When the content of Ga is low, even though special heat treatment is carried out, a Ga-rich phase is not easy to precipitate in a stainless steel matrix, and sufficient concentration of Ga ions cannot be precipitated when the stainless steel matrix is contacted with a solution medium, so that the normal proliferation activity of bacteria is inhibited, and the synergistic antibacterial effect of the Ga ions and the Cu ions is fully exerted. When the Ga content is relatively excessively high, excessive Ga-rich phase may cause severe degradation of hot workability and cold formability of the stainless steel, affecting practical use thereof. In addition, excessive Ga-rich phase precipitation can also damage the continuity of the stainless steel passive film and reduce the corrosion resistance of the stainless steel.
The invention also provides a heat treatment process of the antibacterial stainless steel for the handrails or the handles, which comprises the following steps:
hot processing: homogenizing the steel ingot at 1050-1100 ℃ for 1-3 hours, cogging and forging, forging into a blank in multiple passes, wherein the final forging temperature is not lower than 900 ℃;
solution heat treatment: solution treatment at 1000-1040 deg.C for 1-3 hr, air cooling or water cooling to room temperature.
Wherein the selection of the solution heat treatment temperature is also one of the core contents of the invention. The design basis is to ensure that the Ga element and the Cu element realize supersaturated solid solution, so that a part of the Ga element and the Cu element exist in a stainless steel matrix in a solid solution state, and a part of the Ga element and the Cu element exist in a precipitated phase (Fe)3Ga and Cu-rich phase) and exerts its excellent antibacterial properties. Too low a solid solution temperature, the matrix cannot be sufficiently homogenized; and when the solid solution temperature is too high, the precipitated phase exists in a solid solution state too much, and the antibacterial effect is reduced.
The invention has the beneficial effects that:
1. for the existing Cu-containing antibacterial stainless steel, the aim of inhibiting the proliferation of bacteria is achieved mainly by means of the dissolution of a trace amount of Cu ions. Due to the limitations of the dissolution rate and the dissolution concentration, the antibacterial effect of the Cu-containing antibacterial stainless steel is realized by combining with a specific aging treatment under the condition that the handrail or the handle and the like are in contact with hands, which undoubtedly increases the processing flow and the production cost. Therefore, the invention is based on the existing Cu-containing antibacterial stainless steel, properly increases the Ga content in the steel, only needs certain solid solution treatment to ensure that Ga and Cu are supersaturated and solid-dissolved in the matrix, and ensures that a certain amount of Ga-rich phase and Cu-rich phase are precipitated on the matrix in the steel. When the antibacterial agent is contacted with the hand to act, the trivalent Ga ions and the Cu ions play a role in destroying the bacterial cell wall and increasing the antibacterial effect of the Cu ions.
2. Due to the addition of Ga, the promotion effect of Fe ion dissolution on the growth of bacterial cells is inhibited, and the antibacterial efficiency of the Cu-containing antibacterial stainless steel can be effectively improved.
The application range is as follows:
the antibacterial stainless steel for the handrails or the handles has good antibacterial performance and simple heat treatment steps, and can be widely applied to material selection of various handrails, handles and the like which are in direct contact with hands.
Drawings
FIG. 1 shows the antibacterial stainless steel Escherichia coli (bacteria concentration 10)5CFU/mL). (a) Cu-containing antibacterial stainless steel in a solid solution state, (b) novel antibacterial stainless steel (containing Ga + Cu antibacterial phase) in a solid solution state, and (c) blank control bacterial colony pattern.
Detailed Description
According to the chemical composition range set by the antibacterial stainless steel of the invention, 25 kg of vacuum induction furnace is adopted to smelt each 15 kg of the antibacterial stainless steel of the invention and the Cu-containing antibacterial stainless steel of the comparative example of furnace 1, and the chemical compositions are shown in Table 1.
The forging process comprises the following steps: the alloy cast ingot is subjected to homogenization heat treatment at 1080 +/-5 ℃ for 2 hours to cogging, and is forged into a primary rolling plate with the thickness of 40 multiplied by 120mm by three heats, and the finish forging temperature is 915 ℃.
The hot rolling process comprises the following steps: the initial rolling blank is rolled at the temperature of 1080 +/-5 ℃ for 2.5 hours, and is rolled into a performance test plate by multiple passes, wherein the thickness of the plate in the embodiment is 10 mm.
Table 1 chemical compositions (wt,%) of antibacterial stainless steel of examples and comparative examples
And (3) detecting the antibacterial performance: according to the relevant standards of' JIS Z2801 & 2000 & lt & gt antibacterial processed products-antibacterial property test method and antibacterial effect & gt, GB/T2591 & lt & gt 2003 & lt & gt antibacterial property test method and antibacterial effect & gt & lt & gt for antibacterial plastics & gt, the concentration of bacteria is selected to be 105CFU/mL. The sterilization rate of the antibacterial stainless steel of the examples and the comparative examples after the antibacterial stainless steel acts on common bacteria was quantitatively tested. Wherein the calculation formula of the antibacterial rate is as follows: percent antibacterial ratio [ (% viable count of blank control sample-viable count of antibacterial stainless steel sample)/viable count of blank control sample]X 100, the viable count of the blank control sample is the viable count of bacteria cultured on an inert glass flat plate, and the viable count of the antibacterial stainless steel is the viable count of bacteria cultured on the antibacterial stainless steel containing Cu or the antibacterial stainless steel containing (Cu + Ga).
Example 1
In this embodiment, the heat treatment process of the antibacterial stainless steel is as follows: keeping the temperature at 1025 ℃ for 1h, and cooling to room temperature by water. According to the antibacterial detection method, the antibacterial performance of the typical bacteria is detected, and the result is as follows:
(1) antibacterial efficiency against E.coli (Escherichia Coli): more than or equal to 95.4 percent;
(2) antibacterial ratio against staphylococcus aureus (staphylococcus aureus): more than or equal to 94.7 percent.
The novel stainless steel exhibits excellent antibacterial properties.
Example 2
In this embodiment, the heat treatment process of the antibacterial stainless steel is as follows: keeping the temperature at 1030 ℃ for 2h, and cooling to room temperature by water. According to the antibacterial detection method, the antibacterial performance of the typical bacteria is detected, and the result is as follows:
(1) antibacterial efficiency against E.coli (Escherichia Coli): more than or equal to 95.8 percent;
(2) antibacterial ratio against staphylococcus aureus (staphylococcus aureus): more than or equal to 95.6 percent.
The novel stainless steel exhibits excellent antibacterial properties.
Example 3
In this embodiment, the heat treatment process of the antibacterial stainless steel is as follows: keeping the temperature at 1030 ℃ for 3h, and cooling to room temperature in air. According to the antibacterial detection method, the antibacterial performance of the typical bacteria is detected, and the result is as follows:
(1) antibacterial efficiency against E.coli (Escherichia Coli): more than or equal to 97.4 percent;
(2) antibacterial ratio against staphylococcus aureus (staphylococcus aureus): more than or equal to 97.2 percent.
The novel stainless steel exhibits excellent antibacterial properties.
Example 4
In this embodiment, the heat treatment process of the antibacterial stainless steel is as follows: keeping the temperature at 1000 ℃ for 2.5h, and cooling to room temperature by water. According to the antibacterial detection method, the antibacterial performance of the typical bacteria is detected, and the antibacterial rate result is as follows:
(1) antibacterial efficiency against E.coli (Escherichia Coli): not less than 99.5%;
(2) antibacterial ratio against staphylococcus aureus (staphylococcus aureus): not less than 99.0 percent.
The novel stainless steel exhibits excellent antibacterial properties.
Example 5
In this embodiment, the heat treatment process of the antibacterial stainless steel is as follows: keeping the temperature at 1010 ℃ for 3h, and cooling to room temperature in air. According to the antibacterial detection method, the antibacterial performance of the typical bacteria is detected, and the antibacterial rate result is as follows:
(1) antibacterial efficiency against E.coli (Escherichia Coli): not less than 99.9%;
(2) antibacterial ratio against staphylococcus aureus (staphylococcus aureus): not less than 99.8 percent.
The novel stainless steel exhibits excellent antibacterial properties.
Example 6
In this embodiment, the heat treatment process of the antibacterial stainless steel is as follows: the temperature is kept at 1040 ℃ for 3h, and the temperature is cooled to room temperature by water. According to the antibacterial detection method, the antibacterial performance of the typical bacteria is detected, and the antibacterial rate result is as follows:
(1) antibacterial efficiency against E.coli (Escherichia Coli): more than or equal to 98.7 percent;
(2) antibacterial ratio against staphylococcus aureus (staphylococcus aureus): more than or equal to 97.9 percent.
The novel stainless steel exhibits excellent antibacterial properties.
Comparative example
In this embodiment, the heat treatment process of the antibacterial stainless steel is as follows: keeping the temperature at 1030 ℃ for 2h, and cooling to room temperature by water. According to the antibacterial detection method, the antibacterial performance of the mixed bacteria is detected, and the antibacterial rate result is as follows:
(1) antibacterial efficiency against E.coli (Escherichia Coli): not less than 46.8 percent;
(2) antibacterial ratio against staphylococcus aureus (staphylococcus aureus): more than or equal to 48.2 percent.
As can be seen from the comparative example, for the copper-containing antibacterial stainless steel, the antibacterial rate to common bacteria such as Escherichia coli and Staphylococcus aureus is low if the copper-containing antibacterial stainless steel is not subjected to aging treatment. Generally, a material having an antibacterial rate of more than 90% may be referred to as an antibacterial material. The antibacterial results of the embodiment on escherichia coli and staphylococcus aureus show that the antibacterial rate of the antibacterial stainless steel provided by the invention can exceed more than 90%. In conclusion, the addition of the Ga element is assisted by proper solution heat treatment, so that the antibacterial stainless steel has a remarkable antibacterial function.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. An antibacterial stainless steel, which is characterized in that: the stainless steel comprises the following chemical components in percentage by weight: c: less than or equal to 0.08; si: less than or equal to 0.50; mn: less than or equal to 1.00; p: less than or equal to 0.05; s: less than or equal to 0.05; ni: 8.0-12.0; cr: 18.0-20.0; cu: 3.0-5.0; ga: 0.50-1.50; the balance being Fe;
solution heat treatment: solution treatment at 1000-1040 ℃ for 1-3 hours, air cooling or water cooling to room temperature; the stainless steel has a concentration of 105CFU/mL bacteria have effective antibacterial effect.
2. The antimicrobial stainless steel of claim 1, wherein: the chemical components are as follows according to the weight percentage: c: less than or equal to 0.03; si: less than or equal to 0.50; mn: less than or equal to 1.00; p: less than or equal to 0.005; s: less than or equal to 0.005; ni: 8.5-9.5; cr: 18.5-19.5; cu: 3.5-4.5; ga: 0.80-1.20; the balance being Fe.
3. A method of manufacturing the antibacterial stainless steel of claim 1, characterized in that: the antibacterial stainless steel is obtained by adopting the following method: vacuum induction smelting, electric arc furnace + continuous casting smelting or electric arc furnace smelting + external refining.
4. A method of manufacturing an antibacterial stainless steel according to claim 3, characterized in that: the stainless steel obtained by smelting adopts the following hot working and heat treatment processes:
hot processing: homogenizing the steel ingot at 1050 ℃ and 1100 ℃ for 1-3 hours, cogging and forging, forging into a blank in multiple passes, and finally forging at the temperature not lower than 900 ℃.
5. Use of the antibacterial stainless steel of claim 1 as a stair railing.
6. Use of the antimicrobial stainless steel of claim 1 as a railing.
7. Use of the antibacterial stainless steel of claim 1 as a door handle.
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| CN109481208A (en) * | 2018-12-21 | 2019-03-19 | 南京汉瑞生物科技有限公司 | A kind of medical nursing equipment using gallium element |
| 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 |
| CN111411309A (en) * | 2020-05-14 | 2020-07-14 | 江苏铭星供水设备有限公司 | Stainless steel capable of inhibiting formation of bacterial biofilm and preparation method thereof |
| CN114231966A (en) * | 2021-11-30 | 2022-03-25 | 中国科学院金属研究所 | Cold spraying copper-containing stainless steel coating with antibacterial and antiviral functions |
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| JP6621254B2 (en) * | 2015-06-26 | 2019-12-18 | 日鉄ステンレス株式会社 | Austenitic stainless steel sheet for exhaust parts with excellent heat resistance and surface smoothness and method for producing the same |
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