WO2022202507A1 - Matériau à base d'acier inoxydable et son procédé de fabrication, et élément antibactérien/antiviral - Google Patents

Matériau à base d'acier inoxydable et son procédé de fabrication, et élément antibactérien/antiviral Download PDF

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WO2022202507A1
WO2022202507A1 PCT/JP2022/011738 JP2022011738W WO2022202507A1 WO 2022202507 A1 WO2022202507 A1 WO 2022202507A1 JP 2022011738 W JP2022011738 W JP 2022011738W WO 2022202507 A1 WO2022202507 A1 WO 2022202507A1
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stainless steel
steel material
phase
content
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PCT/JP2022/011738
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English (en)
Japanese (ja)
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明訓 河野
一幸 景岡
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日鉄ステンレス株式会社
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Priority claimed from JP2021054054A external-priority patent/JP2022151130A/ja
Priority claimed from JP2021054052A external-priority patent/JP2022151128A/ja
Application filed by 日鉄ステンレス株式会社 filed Critical 日鉄ステンレス株式会社
Priority to EP22775296.1A priority Critical patent/EP4317481A1/fr
Priority to MX2023011015A priority patent/MX2023011015A/es
Priority to CN202280006944.2A priority patent/CN116368246A/zh
Priority to KR1020237014019A priority patent/KR20230076838A/ko
Priority to US18/260,513 priority patent/US20240060151A1/en
Publication of WO2022202507A1 publication Critical patent/WO2022202507A1/fr

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Definitions

  • the present invention relates to a stainless steel material, its manufacturing method, and an antibacterial/antiviral member.
  • stainless steel Because of its excellent corrosion resistance, stainless steel is used in a wide range of applications, including kitchen equipment, home appliances, medical equipment, interior building materials, and transportation equipment. use is also increasing. In recent years, there has been a growing concern about the adverse effects on the human body caused by the propagation of bacteria and attachment of viruses. Antibacterial and antiviral properties are also required for various members used for goods and transportation equipment.
  • Patent Document 1 contains C: 0.1% by weight or less, Si: 2% by weight or less, Mn: 2% by weight or less, Cr: 10 to 30% by weight, and Cu: 0.4 to 3% by weight.
  • a ferritic stainless steel material having excellent antibacterial properties in which a Cu-rich phase ( ⁇ -Cu phase) is precipitated in a matrix at a rate of 0.2% by volume or more has been proposed.
  • This ferritic stainless steel material contains C: 0.1% by weight or less, Si: 2% by weight or less, Mn: 2% by weight or less, Cr: 10 to 30% by weight, and Cu: 0.4 to 3% by weight. It is produced by cold-rolling stainless steel, final annealing, and aging treatment at 500 to 800° C. to precipitate a Cu-rich phase ( ⁇ -Cu phase) to 0.2% by volume or more.
  • Patent Document 2 C: 0.1% by weight or less, Si: 2% by weight or less, Mn: 5% by weight or less, Cr: 10 to 30% by weight, Ni: 5 to 15% by weight, Cu: 1 It has a composition containing 0 to 5.0% by weight, and has excellent antibacterial properties in which the second phase ( ⁇ -Cu phase) mainly composed of Cu is dispersed in the matrix at a rate of 0.2% by volume or more.
  • Austenitic stainless steel materials have been proposed. This austenitic stainless steel material contains C: 0.1% by weight or less, Si: 2% by weight or less, Mn: 5% by weight or less, Cr: 10 to 30% by weight, Ni: 5 to 15% by weight, and Cu: 1.0% by weight. It is produced by subjecting austenitic stainless steel containing 0 to 5.0 wt.
  • the purpose of the present invention is to provide a stainless steel material that can maintain antibacterial and antiviral properties for a long period of time, a method for manufacturing the same, and an antibacterial/antiviral member.
  • the inventors of the present invention have made intensive studies to solve the above problems, and as a result, the distribution state of the ⁇ -Cu phase on the surface of the stainless steel material (particularly, the area ratio of the ⁇ -Cu phase on the surface, the ⁇ -Cu The inventors have found that the average particle size of the phase and the maximum interparticle distance of the ⁇ -Cu phase) are closely related to the antibacterial and antiviral properties and their durability, and have completed the present invention.
  • the present invention has an ⁇ -Cu phase exposed on the surface
  • the ⁇ -Cu phase on the surface is a stainless steel material having an area ratio of 0.1 to 4.0%, an average particle diameter of 10 to 300 nm, and a maximum interparticle distance of 100 to 1000 nm.
  • C 0.10% or less, Si: 4.00% or less, Mn: 2.00% or less, P: 0.050% or less, S: 0.030% or less, Slab having a ferritic composition containing Ni: 4.00% or less, Cr: 10.00 to 32.00%, Cu: 0.40 to 4.00%, the balance being Fe and impurities, or mass basis C: 0.12% or less, Si: 4.00% or less, Mn: 6.00% or less, P: 0.050% or less, S: 0.030% or less, Ni: 4.00-20. 00%, Cr: 10.00 to 32.00%, Cu: 2.00 to 6.00%, and the balance being Fe and impurities.
  • the finish hot rolling finish temperature is 700 to 900 ° C. when the slab composition is the ferrite system, and the finish hot rolling finish temperature is 850 to 1050 ° C. when the slab composition is the austenite system.
  • the present invention is an antibacterial/antiviral member containing the stainless steel material.
  • the present invention it is possible to provide a stainless steel material capable of maintaining antibacterial and antiviral properties for a long period of time, a method for producing the same, and an antibacterial/antiviral member.
  • FIG. 1 is a schematic diagram of the surface of a typical stainless steel material of the present invention.
  • the present invention is a stainless steel material having an ⁇ -Cu phase exposed on the surface.
  • the ⁇ -Cu phase has an area ratio of 0.1 to 4.0%, an average particle diameter of 10 to 300 nm, and a maximum interparticle distance of 100 to 1000 nm.
  • FIG. 1 shows a schematic diagram of the surface of a typical stainless steel material of the present invention. As shown in FIG. 1, the stainless steel material 10 has an ⁇ -Cu phase 11 exposed on the surface of the parent phase. A passive film 12 is formed on the surface of the matrix phase where the ⁇ -Cu phase 11 is not exposed.
  • Cu ions By exposing the ⁇ -Cu phase 11 on the surface of the parent phase, Cu ions can be eluted from the ⁇ -Cu phase 11 when water contacts the surface of the stainless steel material 10 .
  • a human hand touches the surface of the stainless steel material 10
  • Cu ions can be eluted from the ⁇ -Cu phase 11 by the moisture of the hand. Therefore, even if bacteria adhere to the surface, they can be sterilized, and even if viruses adhere to the surface, they can be inactivated and eventually killed.
  • the passivation film 12 is formed on the surface of the matrix phase where the ⁇ -Cu phase 11 is not exposed, corrosion resistance is also good.
  • the composition of the stainless steel material of the present invention is not particularly limited, but C: 0.12% or less, Si: 4.00% or less, Mn: 6.00% or less, P: 0.050% or less, S: 0.05% or less. 030% or less, Ni: 20.00% or less, Cr: 10.00 to 32.00%, Cu: 0.40 to 6.00%, and the balance being Fe and impurities.
  • “%” for components means “% by mass” unless otherwise specified.
  • the metallographic structure of the stainless steel material of the present invention is not particularly limited, it is preferably ferritic or austenitic.
  • embodiments of the present invention will be specifically described with reference to ferritic stainless steel materials and austenitic stainless steel materials as examples.
  • the present invention is not limited to the following embodiments, and modifications and improvements can be made to the following embodiments based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. are also within the scope of the present invention.
  • the ferritic stainless steel material according to Embodiment 1 of the present invention contains C: 0.10% or less, Si: 4.00% or less, Mn: 2.00% or less, P: 0.050% or less, and S: 0.05% or less.
  • the term "steel material” means materials of various types such as steel plates.
  • the term “steel plate” is a concept including a steel strip.
  • impurities refers to components mixed in by various factors in the manufacturing process, such as raw materials such as ores and scraps, during the industrial production of stainless steel materials, and is permissible within a range that does not adversely affect the present invention. means to be
  • the ferritic stainless steel material according to Embodiment 1 of the present invention has Nb: 1.00% or less, Ti: 0.60% or less, V: 1.00% or less, W: 2.00% or less, Mo: 3.00% or less, N: 0.050% or less, Sn: 0.50% or less, Al: 5.00% or less, Zr: 0.50% or less, Co: 0.50% or less, B: 0.50% or less. 010% or less, Ca: 0.10% or less, and REM: 0.20% or less.
  • Nb 1.00% or less
  • Ti 0.60% or less
  • V 1.00% or less
  • W 2.00% or less
  • Mo 3.00% or less
  • N 0.050% or less
  • Sn 0.50% or less
  • Al 5.00% or less
  • Zr 0.50% or less
  • Co 0.50% or less
  • B 0.50% or less
  • Ca 0.10% or less
  • REM 0.20% or less.
  • C is an effective element for improving the strength of the ferritic stainless steel material and uniformly dispersing and precipitating the ⁇ -Cu phase by forming Cr carbide.
  • the upper limit of the C content is controlled to 0.10%, preferably 0.06%, more preferably 0.04%, still more preferably 0.03%.
  • the lower limit of the C content is not particularly limited, but is preferably 0.001%, more preferably 0.003%, and still more preferably 0.005%.
  • Si is an element that forms a ferrite phase ( ⁇ phase), and is an element that is effective in improving the corrosion resistance and strength of ferritic stainless steel materials.
  • the upper limit of the Si content is controlled to 4.00%, preferably 2.00%, more preferably 1.50%, still more preferably 1.00%.
  • the lower limit of the Si content is not particularly limited, but is preferably 0.01%, more preferably 0.05%, and still more preferably 0.10%.
  • Mn is an element that improves the heat resistance of ferritic stainless steel. However, if the Mn content is too high, the corrosion resistance of the ferritic stainless steel will be lowered. Moreover, since Mn is an austenite phase ( ⁇ phase)-forming element, it forms a ⁇ phase (a martensite phase at room temperature) at high temperatures, thereby deteriorating the workability of ferritic stainless steel materials. Therefore, the upper limit of the Mn content is controlled to 2.00%, preferably 1.50%, more preferably 1.20%, still more preferably 1.00%. On the other hand, the lower limit of the Mn content is not particularly limited, but is preferably 0.01%, more preferably 0.05%, and still more preferably 0.10%.
  • ⁇ P 0.050% or less> If the content of P is too high, the corrosion resistance and workability of the ferritic stainless steel will be lowered. Therefore, the upper limit of the P content is controlled to 0.050%, preferably 0.040%, more preferably 0.030%. On the other hand, the lower limit of the P content is not particularly limited. 010%.
  • the upper limit of the S content is controlled to 0.030%, preferably 0.020%, more preferably 0.010%.
  • the lower limit of the S content is not particularly limited. 0003%.
  • Ni is an element that improves the corrosion resistance of ferritic stainless steel.
  • Ni like Mn, is an austenite phase ( ⁇ phase)-forming element. sexuality declines.
  • the upper limit of the Ni content is controlled to 4.00%, preferably 2.00%, more preferably 1.00%, still more preferably 0.60%.
  • the lower limit of the Ni content is not particularly limited, but is preferably 0.005%, more preferably 0.01%, and still more preferably 0.03%.
  • Cr is an important element for maintaining the corrosion resistance of ferritic stainless steel.
  • the upper limit of the Cr content is controlled to 32.00%, preferably 22.00%, more preferably 20.00%, still more preferably 18.00%.
  • the lower limit of the Cr content is controlled to 10.00%, preferably 14.00%, more preferably 15.00%, still more preferably 16.00%.
  • Cu is an element necessary for precipitating the ⁇ -Cu phase, which provides antibacterial and antiviral properties.
  • Cu is also an element that improves the workability of ferritic stainless steel.
  • the lower limit of the Cu content is controlled to 0.40%, preferably 0.70%, more preferably 1.00%, still more preferably 1.30%.
  • the upper limit of the Cu content is controlled to 4.00%, preferably 3.00%, more preferably 2.00%, still more preferably 1.70%.
  • Nb is an element that exhibits the effect of forming precipitates and uniformly precipitating the ⁇ -Cu phase around them, and is added as necessary.
  • the upper limit of the Nb content is controlled to 1.00%, preferably 0.80%, more preferably 0.60%, still more preferably 0.55%.
  • the lower limit of the Nb content is not particularly limited, but from the viewpoint of obtaining the effect of Nb, it is preferably 0.05%, more preferably 0.10%, still more preferably 0.20%, and particularly preferably 0.25%.
  • Ti like Nb, is an element that forms precipitates and exhibits the effect of uniformly precipitating the ⁇ -Cu phase around them, and is added as necessary.
  • the upper limit of the Ti content is controlled to 0.60%, preferably 0.30%.
  • the lower limit of the Ti content is not particularly limited, but from the viewpoint of obtaining the effect of Ti, it is preferably 0.01%, more preferably 0.03%.
  • V like Nb and Ti
  • the upper limit of the V content is controlled to 1.00%, preferably 0.50%.
  • the lower limit of the V content is not particularly limited, but from the viewpoint of obtaining the effect of V, it is preferably 0.01%, more preferably 0.03%.
  • ⁇ W 2.00% or less>
  • W like Nb, Ti, and V, is an element that exhibits the effect of forming precipitates and uniformly precipitating the ⁇ -Cu phase around them, and is added as necessary.
  • the upper limit of the W content is controlled to 2.00%, preferably 1.00%.
  • the lower limit of the W content is not particularly limited, but from the viewpoint of obtaining the effect of W, it is preferably 0.01%, more preferably 0.03%.
  • Mo is an element that improves the corrosion resistance of ferritic stainless steel materials and is added as necessary.
  • the upper limit of the Mo content is controlled to 3.00%, preferably 2.00%, more preferably 1.50%, still more preferably 1.00%.
  • the lower limit of the Mo content is not particularly limited, but from the viewpoint of obtaining the effect of Mo, it is preferably 0.01%, more preferably 0.03%, and still more preferably 0.10%.
  • N is an element that improves the corrosion resistance of ferritic stainless steel materials and is added as necessary.
  • the upper limit of the N content is controlled to 0.050%, preferably 0.030%, more preferably 0.025%, still more preferably 0.015%.
  • the lower limit of the N content is not particularly limited, but from the viewpoint of obtaining the effect of N, it is preferably 0.001%, preferably 0.003%.
  • Sn 0.50% or less>
  • Sn is an element that improves the corrosion resistance of ferritic stainless steel materials, and is added as necessary.
  • the upper limit of the Sn content is controlled to 0.50%, preferably 0.30%.
  • the lower limit of the Sn content is not particularly limited, but from the viewpoint of obtaining the effect of Sn, it is preferably 0.01%, more preferably 0.03%.
  • Al is an element used for deoxidation in the refining process and is added as necessary. Al is also an element that improves the corrosion resistance and oxidation resistance of ferritic stainless steel. However, if the Al content is too high, the amount of inclusions produced increases and the quality deteriorates. Therefore, the upper limit of the Al content is 5.00%, preferably 3.00%, more preferably 2.00%, still more preferably 1.00%. On the other hand, the lower limit of the Al content is not particularly limited, but from the viewpoint of obtaining the effect of Al, it is preferably 0.01%, more preferably 0.05%.
  • ⁇ Zr 0.50% or less>
  • Zr like Al
  • the upper limit of the Zr content is controlled to 0.50%, preferably 0.30%.
  • the lower limit of the Zr content is not particularly limited, but from the viewpoint of obtaining the effect of Zr, it is preferably 0.01%, more preferably 0.03%.
  • Co like Al and Zr
  • Co is an element that improves the oxidation resistance of ferritic stainless steel materials, and is added as necessary.
  • the upper limit of the Co content is controlled to 0.50%, preferably 0.30%.
  • the lower limit of the Co content is not particularly limited, but from the viewpoint of obtaining the effect of Co, it is preferably 0.01%, more preferably 0.03%.
  • B is an element that improves the hot workability of ferritic stainless steel materials, and is added as necessary.
  • B is also an element that improves the secondary workability of ferritic stainless steel materials by strengthening grain boundaries.
  • the upper limit of the B content is controlled to 0.010%, preferably 0.070%.
  • the lower limit of the content of B is not particularly limited, but from the viewpoint of obtaining the effect of B, it is preferably 0.001%, more preferably 0.002%.
  • Ca like B, is an element that improves the hot workability of ferritic stainless steel materials, and is added as necessary. Ca is also an element that forms sulfides and suppresses grain boundary segregation of S, thereby improving grain boundary oxidation resistance. However, if the Ca content is too high, workability is lowered. Therefore, the upper limit of the Ca content is controlled to 0.10%, preferably 0.05%. On the other hand, the lower limit of the Ca content is not particularly limited, but is preferably 0.001%, more preferably 0.003%, from the viewpoint of obtaining the effect of Ca.
  • REM rare earth element
  • the upper limit of the REM content is controlled to 0.20%, preferably 0.10%.
  • the lower limit of the REM content is not particularly limited, but is preferably 0.001%, more preferably 0.01%, from the viewpoint of obtaining the effect of REM.
  • REM is a general term for two elements, scandium (Sc) and yttrium (Y), and fifteen elements (lanthanoids) from lanthanum (La) to lutetium (Lu). These may be used alone or as a mixture of two or more.
  • ⁇ Area ratio 0.1 to 4.0%>
  • the area ratio of the ⁇ -Cu phase exposed to the surface increases, the amount of Cu ions eluted increases, so antibacterial and antiviral properties can be enhanced.
  • the area fraction of this ⁇ -Cu phase mainly depends on the crystal structure and the Cu content. Therefore, considering the Cu content in the ferritic stainless steel material, the upper limit of the area ratio of the ⁇ -Cu phase is 4.0%, preferably 2.0%, more preferably 1.9%, and even more preferably controlled at 1.8%.
  • the lower limit of the area ratio of the ⁇ -Cu phase is controlled to 0.1%, preferably 0.3%, more preferably 0.6% from the viewpoint of ensuring antibacterial and antiviral properties.
  • the "area ratio of the ⁇ -Cu phase exposed on the surface” in this specification can be calculated by observing the surface of the stainless steel material with a TEM (transmission electron microscope). Specifically, after photographing TEM images at three or more randomly selected locations on the surface of the stainless steel material, the TEM images are image-analyzed to measure the area of the ⁇ -Cu phase. is divided by the visual field area, the "area ratio of the ⁇ -Cu phase exposed on the surface” can be calculated.
  • the field of view area is not particularly limited, it is preferably 10 ⁇ m 2 or more in total of the photographed locations.
  • ⁇ Average particle size 10 to 300 nm>
  • the average particle size of the ⁇ -Cu phase exposed on the surface is larger, Cu ions can be eluted over a longer period of time, thereby improving the durability of the antibacterial and antiviral properties.
  • the average particle size of the ⁇ -Cu phase is too large, the distance between particles of the ⁇ -Cu phase exposed on the surface tends to increase. Therefore, when bacteria or viruses adhere between the particles of the ⁇ -Cu phase exposed on the surface, sufficient antibacterial and antiviral properties may not be obtained. Therefore, the upper limit of the average particle size of the ⁇ -Cu phase is controlled to 300 nm, preferably 250 nm, more preferably 200 nm.
  • the lower limit of the average particle size of the ⁇ -Cu phase is controlled to 10 nm, preferably 30 nm, more preferably 50 nm, from the viewpoint of ensuring the elution sustainability of Cu ions.
  • the "average particle size of the ⁇ -Cu phase exposed on the surface” in this specification can be calculated by observing the surface of the stainless steel material with a TEM (transmission electron microscope). Specifically, after photographing TEM images at three or more randomly selected locations on the surface of the stainless steel material, the TEM images are image-analyzed to obtain the circle-equivalent diameter of the ⁇ -Cu phase, and the average value is calculated as " The average particle size of the ⁇ -Cu phase exposed on the surface”.
  • ⁇ Maximum distance between particles 100 to 1000 nm>
  • the size of bacteria is 0.5-3 ⁇ m, whereas the size of viruses is very small, 10-200 nm. Therefore, if the maximum interparticle distance of the ⁇ -Cu phase exposed on the surface is too large, sufficient antiviral properties cannot be obtained particularly when a virus adheres between the particles of the ⁇ -Cu phase exposed on the surface. Sometimes. Therefore, the upper limit of the maximum interparticle distance of the ⁇ -Cu phase is controlled to 1000 nm, preferably 800 nm, more preferably 500 nm. On the other hand, the smaller the maximum interparticle distance of the ⁇ -Cu phase exposed on the surface, the better the antibacterial and antiviral properties.
  • the lower limit of the maximum distance between grains of the ⁇ -Cu phase is thought to be 100 nm. Therefore, the lower limit of the maximum interparticle distance of the ⁇ -Cu phase is controlled to 100 nm, preferably 150 nm, more preferably 200 nm.
  • the "maximum interparticle distance of the ⁇ -Cu phase exposed on the surface” in this specification can be calculated by observing the surface of the stainless steel material with a TEM (transmission electron microscope). Specifically, after photographing TEM images at three or more randomly selected locations on the surface of the stainless steel material, the TEM images are image-analyzed, and the position of the center of gravity (generating point) of the ⁇ -Cu phase is obtained, followed by Voronoi division. do. Next, the distance between the centers of gravity of the ⁇ -Cu phase in the adjacent Voronoi regions is measured as the inter-particle distance, and the maximum value can be taken as the "maximum inter-particle distance of the ⁇ -Cu phase exposed on the surface".
  • TEM transmission electron microscope
  • the ferritic stainless steel material according to Embodiment 1 of the present invention preferably has a Vickers hardness of 160 Hv or less. By controlling the Vickers hardness in such a manner, workability can be ensured, so that it can be used for various purposes.
  • the lower limit of Vickers hardness is not particularly limited, it is generally 100Hv.
  • the "Vickers hardness" in this specification can be measured according to JIS Z2244:2009. In the measurement of Vickers hardness, the measurement load is 10 kg, the measurement is performed at 5 or more randomly selected locations, and the average value is taken as the result of Vickers hardness.
  • the ferritic stainless steel material according to Embodiment 1 of the present invention preferably has an antibacterial activity value of 2.0 or more in an antibacterial test conforming to JIS Z2801:2010. With such an antibacterial activity value, high antibacterial properties can be objectively ensured.
  • the "antibacterial test” in this specification conforms to JIS Z2801:2010 and is performed using Staphylococcus aureus as bacteria.
  • the ferritic stainless steel material according to Embodiment 1 of the present invention preferably has an antiviral activity value of 2.0 or more in an antiviral test conforming to ISO 21702:2019. With such an antiviral activity value, high antiviral properties can be objectively guaranteed.
  • the "antiviral test" in the present specification is performed in accordance with ISO 21702:2019 using influenza A virus as the virus.
  • the type of the ferritic stainless steel material according to Embodiment 1 of the present invention is not particularly limited, it is preferably a hot-rolled material or a cold-rolled material.
  • hot-rolled material its thickness is generally 3 mm or more.
  • cold-rolled material the thickness is generally less than 3 mm.
  • the ferritic stainless steel material according to Embodiment 1 of the present invention can be manufactured by a method including a hot rolling process, a cooling process, and a heat treatment process.
  • the hot-rolling step is a step of hot-rolling a slab having the above composition to obtain a hot-rolled material.
  • a hot-rolled material is obtained by subjecting a slab having the above composition to rough rolling, followed by finish hot rolling. This hot-rolled material may be wound into a coil.
  • the slab having the above composition is not particularly limited, but can be obtained, for example, by melting stainless steel having the above composition and forging or casting.
  • Finish hot rolling is carried out so that the finishing temperature of finish hot rolling is 700 to 900°C.
  • the final hot rolling temperature within this temperature range, a small amount of fine "seeds" of the ⁇ -Cu phase can be easily precipitated uniformly in the cooling process after the final hot rolling.
  • the distribution of the ⁇ -Cu phase on the surface can be controlled as described above.
  • the finish hot rolling finish temperature is lower than 700° C., fine "seeds" of the ⁇ -Cu phase are not sufficiently precipitated in the cooling step after the finish hot rolling finish.
  • the finish hot rolling finish temperature exceeds 900°C, the structure becomes coarse and the workability and toughness are lowered.
  • Other conditions in the hot rolling process may be appropriately set according to the composition of the slab, and are not particularly limited.
  • the cooling step is a step for precipitating fine “seeds” of the ⁇ -Cu phase. °C by cooling.
  • a small amount of fine “seeds” of the ⁇ -Cu phase can be uniformly precipitated in the precipitation temperature range (900 to 500° C.) of the ⁇ -Cu phase.
  • the fine "seeds" of the ⁇ -Cu phase preferentially grow in the heat treatment process, relatively large ⁇ -Cu phases are uniformly dispersed.
  • the distribution state of the ⁇ -Cu phase on the surface can be controlled as described above.
  • the average cooling rate is preferably 1 to 5° C./second, more preferably 2 to 4° C./second.
  • the cooling method in the cooling step is not particularly limited, and a method known in the art can be used.
  • the cooling temperature can be finely adjusted by controlling the amount of gas (for example, Ar gas) supplied to the heat insulating box.
  • the heat treatment step is a step of growing fine ⁇ -Cu phase “seeds” precipitated in the cooling step, and is performed by heating the hot-rolled material cooled in the cooling step at 750 to 850° C. for 4 hours or more. .
  • the heating time is preferably 6 to 48 hours, more preferably 8 to 36 hours.
  • the heating temperature is less than 750° C. or the heating time is less than 4 hours, the fine “seeds” of the ⁇ -Cu phase do not grow sufficiently, and the average grains of the ⁇ -Cu phase The diameter becomes too small.
  • the heating temperature exceeds 850° C., the ⁇ -Cu phase dissolves in the matrix phase.
  • a surface layer removing step of pickling and/or polishing may be further performed, if necessary.
  • the thickness of the surface layer to be removed in the surface layer removing step is not particularly limited and may be appropriately adjusted according to the composition of the slab. For example, when removing a Cr-poor layer, it is preferable to remove a surface layer having a thickness of 10 ⁇ m or more.
  • the ferritic stainless steel material is a cold-rolled material
  • cold rolling may be performed, followed by a cold rolling/annealing process in which annealing is performed within 300 seconds.
  • the surface layer removing process is performed after the heat treatment process
  • the cold rolling/annealing process may be performed after the surface layer removing process, or the surface layer removing process may be performed after the cold rolling/annealing process.
  • the conditions for cold rolling and annealing treatment are not particularly limited and may be appropriately adjusted according to the composition of the slab.
  • the ferritic stainless steel material according to Embodiment 1 of the present invention can maintain antibacterial and antiviral properties for a long period of time, it can be used as an antibacterial/antiviral member.
  • the ferritic stainless steel material according to Embodiment 1 of the present invention can have a Vickers hardness of 160 Hv or less, it can be easily processed into a shape suitable for antibacterial/antiviral members.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention contains C: 0.12% or less, Si: 4.00% or less, Mn: 6.00% or less, P: 0.050% or less, and S: 0.05% or less. 030% or less, Ni: 4.00 to 20.00%, Cr: 10.00 to 32.00%, Cu: 2.00 to 6.00%, and the balance being Fe and impurities.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention has Nb: 1.00% or less, Ti: 1.00% or less, V: 1.00% or less, W: 2.00% or less, Mo: 6.00% or less, N: 0.350% or less, Sn: 0.50% or less, Al: 5.00% or less, Zr: 0.50% or less, Co: 0.50% or less, B: 0.50% or less. 020% or less, Ca: 0.10% or less, and REM: 0.20% or less.
  • Nb 1.00% or less
  • Ti 1.00% or less
  • V 1.00% or less
  • W 2.00% or less
  • Mo 6.00% or less
  • N 0.350% or less
  • Sn 0.50% or less
  • Al 5.00% or less
  • Zr 0.50% or less
  • Co 0.50% or less
  • B 0.50% or less
  • Ca 0.10% or less
  • REM 0.20% or less.
  • C is an austenite-forming element, and is an element effective in improving the strength of the austenitic stainless steel material and uniformly dispersing and precipitating the ⁇ -Cu phase by forming Cr carbide.
  • the upper limit of the C content is controlled to 0.12%, preferably 0.10%, more preferably 0.09%, still more preferably 0.08%.
  • the lower limit of the C content is not particularly limited, but is preferably 0.001%, more preferably 0.003%, and still more preferably 0.005%.
  • Si is an effective element for improving the corrosion resistance and strength of austenitic stainless steel.
  • the Si content is too high, the workability of the austenitic stainless steel material will be reduced due to hardening.
  • the upper limit of the Si content is controlled to 4.00%, preferably 3.00%, more preferably 2.00%, still more preferably 1.50%.
  • the lower limit of the Si content is not particularly limited, but is preferably 0.01%, more preferably 0.05%, and still more preferably 0.10%.
  • Mn is an austenite phase ( ⁇ phase) forming element. Also, Mn generates MnS, and MnS acts as a nucleus of the ⁇ -Cu phase. However, if the Mn content is too high, the corrosion resistance of the austenitic stainless steel will be lowered. Therefore, the upper limit of the Mn content is controlled to 6.00%, preferably 4.00%, more preferably 3.00%, still more preferably 2.50%. On the other hand, the lower limit of the Mn content is not particularly limited, but is preferably 0.01%, more preferably 0.05%, and still more preferably 0.10%.
  • ⁇ P 0.050% or less> If the P content is too high, the corrosion resistance and workability of the austenitic stainless steel will be lowered. Therefore, the upper limit of the P content is controlled to 0.050%, preferably 0.040%, more preferably 0.035%. On the other hand, the lower limit of the P content is not particularly limited. 010%.
  • the upper limit of the S content is controlled to 0.030%, preferably 0.020%, more preferably 0.010%.
  • the lower limit of the S content is not particularly limited. 0003%.
  • Ni like Mn, is an austenite phase ( ⁇ phase) forming element and improves corrosion resistance and workability. Since Ni is an expensive element, an excessive Ni content leads to an increase in manufacturing costs. Therefore, the upper limit of the Ni content is controlled to less than 20.00%, preferably 15.00% or less, more preferably 12.00% or less, still more preferably 10.00% or less. On the other hand, if the Ni content is too low, the corrosion resistance of the austenitic stainless steel will be lowered. Therefore, the lower limit of the Ni content is controlled to 4.00%, preferably 6.00%, more preferably 8.00%, still more preferably 8.50%.
  • Cr is an important element for maintaining the corrosion resistance of austenitic stainless steel.
  • the upper limit of the Cr content is controlled to 32.00%, preferably 25.00%, more preferably 22.00%, still more preferably 20.00%.
  • the lower limit of the Cr content is controlled to 10.00%, preferably 14.00%, more preferably 15.00%, still more preferably 18.00%.
  • Cu is an element necessary for precipitating the ⁇ -Cu phase, which provides antibacterial and antiviral properties.
  • Cu is also an element that improves the workability of austenitic stainless steel.
  • the lower limit of the Cu content is controlled to 2.00%, preferably 2.50%, more preferably 3.00%, still more preferably 3.60%.
  • the upper limit of the Cu content is controlled to 6.00%, preferably 5.00%, more preferably 4.80%, still more preferably 4.50%.
  • Nb 1.00% or less
  • Nb, Ti, V and W are elements that form carbides and nitrides to reduce sensitization due to grain boundary segregation of C and N and improve intergranular corrosion resistance, and are added as necessary. be.
  • the upper limits of the contents of Nb, Ti and V are all controlled to 1.00%, preferably 0.50%.
  • the upper limit of the W content is controlled to 2.00%, preferably 1.50%.
  • the lower limit of the content of Nb, Ti, V and W is not particularly limited, but from the viewpoint of obtaining the effect of these elements, it is 0.01%, preferably 0.02%.
  • Mo is an element that improves the corrosion resistance of austenitic stainless steel materials and is added as necessary. However, if the Mo content is too high, the manufacturing cost will increase. Therefore, the upper limit of the Mo content is controlled to 6.00%, preferably 5.00%, more preferably 3.00%, still more preferably 2.00%. On the other hand, the lower limit of the Mo content is not particularly limited, but from the viewpoint of obtaining the effect of Mo, it is preferably 0.01%, more preferably 0.03%, and still more preferably 0.10%.
  • N is an element that improves the corrosion resistance of austenitic stainless steel materials and is added as necessary.
  • the upper limit of the N content is controlled to 0.350%, preferably 0.200%, more preferably 0.150%, still more preferably 0.050%.
  • the lower limit of the N content is not particularly limited, but from the viewpoint of obtaining the effect of N, it is preferably 0.001%, preferably 0.003%.
  • Sn 0.50% or less> Sn, like Mo and N, is an element that improves the corrosion resistance of austenitic stainless steel materials, and is added as necessary. However, if the Sn content is too high, the hot workability of the austenitic stainless steel will deteriorate. Therefore, the upper limit of the Sn content is controlled to 0.50%, preferably 0.30%. On the other hand, the lower limit of the Sn content is not particularly limited, but from the viewpoint of obtaining the effect of Sn, it is preferably 0.01%, more preferably 0.02%.
  • Al is an element used for deoxidation in the refining process and is added as necessary. Al is also an element that improves the corrosion resistance and oxidation resistance of austenitic stainless steel. However, if the Al content is too high, the amount of inclusions produced increases and the quality deteriorates. Therefore, the upper limit of the Al content is 5.00%, preferably 3.00%, more preferably 2.00%, still more preferably 1.00%. On the other hand, the lower limit of the Al content is not particularly limited, but from the viewpoint of obtaining the effect of Al, it is preferably 0.01%, more preferably 0.03%.
  • ⁇ Zr 0.50% or less>
  • Zr like Al
  • the upper limit of the Zr content is controlled to 0.50%, preferably 0.30%.
  • the lower limit of the Zr content is not particularly limited, but from the viewpoint of obtaining the effect of Zr, it is preferably 0.01%, more preferably 0.03%.
  • Co like Al and Zr
  • Co is an element that improves the oxidation resistance of austenitic stainless steel materials and is added as necessary.
  • the upper limit of the Co content is controlled to 0.50%, preferably 0.30%.
  • the lower limit of the Co content is not particularly limited, but from the viewpoint of obtaining the effect of Co, it is preferably 0.01%, more preferably 0.03%.
  • B is an element that improves hot workability and is added as necessary. However, if the content of B is too high, the corrosion resistance and weldability of the austenitic stainless steel material will deteriorate. Therefore, the upper limit of the B content is controlled to 0.020%, preferably 0.015%, more preferably 0.010%, and even more preferably 0.005%. On the other hand, the lower limit of the content of B is not particularly limited, but is controlled to 0.0001%, preferably 0.0003%, more preferably 0.0005% from the viewpoint of obtaining the effect of B.
  • Ca like B, is an element that improves the hot workability of austenitic stainless steel materials, and is added as necessary. Ca is also an element that forms sulfides and suppresses grain boundary segregation of S, thereby improving grain boundary oxidation resistance. However, if the Ca content is too high, workability is lowered. Therefore, the upper limit of the Ca content is controlled to 0.10%, preferably 0.05%. On the other hand, the lower limit of the Ca content is not particularly limited, but is preferably 0.001%, more preferably 0.003%, from the viewpoint of obtaining the effect of Ca.
  • REM 0.20% or less> REM (rare earth element), like B and Ca, is an element that improves the hot workability of an austenitic stainless steel material, and is added as necessary. REM is also an element that improves corrosion resistance by forming sulfides that are difficult to elute and suppressing the formation of MnS, which is a starting point for corrosion. However, if the REM content is too high, it will lead to an increase in manufacturing costs. Therefore, the upper limit of the REM content is controlled to 0.20%, preferably 0.10%. On the other hand, the lower limit of the REM content is not particularly limited, but is preferably 0.001%, more preferably 0.01%, from the viewpoint of obtaining the effect of REM. It should be noted that REM may be used singly or as a mixture of two or more.
  • ⁇ Area ratio 0.1 to 4.0%>
  • the area ratio of the ⁇ -Cu phase exposed to the surface increases, the amount of Cu ions eluted increases, so antibacterial and antiviral properties can be enhanced.
  • the area fraction of this ⁇ -Cu phase mainly depends on the crystal structure and the Cu content. Therefore, the upper limit of the area ratio of the ⁇ -Cu phase is controlled to 4.0%, preferably 3.0%, more preferably 2.0%, considering the Cu content in the austenitic stainless steel material. .
  • the lower limit of the area ratio of the ⁇ -Cu phase is controlled to 0.1%, preferably 0.3%, more preferably 0.6% from the viewpoint of ensuring antibacterial and antiviral properties.
  • ⁇ Average particle size 10 to 300 nm>
  • the average particle size of the ⁇ -Cu phase exposed on the surface is larger, Cu ions can be eluted over a longer period of time, thereby improving the durability of the antibacterial and antiviral properties.
  • the average particle size of the ⁇ -Cu phase is too large, the distance between particles of the ⁇ -Cu phase exposed on the surface tends to increase. Therefore, when bacteria or viruses adhere between the particles of the ⁇ -Cu phase exposed on the surface, sufficient antibacterial and antiviral properties may not be obtained. Therefore, the upper limit of the average particle size of the ⁇ -Cu phase is controlled to 300 nm, preferably 250 nm, more preferably 200 nm, still more preferably 150 nm.
  • the lower limit of the average particle size of the ⁇ -Cu phase is controlled to 10 nm, preferably 20 nm, more preferably 30 nm, from the viewpoint of ensuring the elution sustainability of Cu ions.
  • ⁇ Maximum distance between particles 100 to 1000 nm>
  • the size of bacteria is 0.5-3 ⁇ m, whereas the size of viruses is very small, 10-200 nm. Therefore, if the maximum interparticle distance of the ⁇ -Cu phase exposed on the surface is too large, sufficient antiviral properties cannot be obtained particularly when a virus adheres between the particles of the ⁇ -Cu phase exposed on the surface. Sometimes. Therefore, the upper limit of the maximum interparticle distance of the ⁇ -Cu phase is controlled to 1000 nm, preferably 800 nm, more preferably 500 nm. On the other hand, the smaller the maximum interparticle distance of the ⁇ -Cu phase exposed on the surface, the better the antibacterial and antiviral properties.
  • the lower limit of the maximum distance between grains of the ⁇ -Cu phase is thought to be 100 nm. Therefore, the lower limit of the maximum interparticle distance of the ⁇ -Cu phase is controlled to 100 nm, preferably 150 nm, more preferably 200 nm.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention preferably has a Vickers hardness of 190 Hv or less, more preferably 180 Hv or less. By controlling the Vickers hardness in such a manner, workability can be ensured, so that it can be used for various purposes. Although the lower limit of Vickers hardness is not particularly limited, it is generally 100Hv.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention preferably has an antibacterial activity value of 2.0 or more in an antibacterial test conforming to JIS Z2801:2010. With such an antibacterial activity value, high antibacterial properties can be objectively ensured.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention preferably has an antiviral activity value of 2.0 or more in an antiviral test conforming to ISO 21702:2019. With such an antiviral activity value, high antiviral properties can be objectively guaranteed.
  • the type of the austenitic stainless steel material according to the second embodiment of the present invention is not particularly limited, it is preferably a hot-rolled material or a cold-rolled material.
  • hot-rolled material its thickness is generally 3 mm or more.
  • cold-rolled material the thickness is generally less than 3 mm.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention can be manufactured by a method including a hot rolling process, a cooling process and a heat treatment process.
  • the hot-rolling step is a step of hot-rolling a slab having the above composition to obtain a hot-rolled material.
  • a hot-rolled material is obtained by subjecting a slab having the above composition to rough rolling, followed by finish hot rolling. This hot-rolled material may be wound into a coil.
  • the slab having the above composition is not particularly limited, but can be obtained, for example, by melting stainless steel having the above composition and forging or casting.
  • Finish hot rolling is carried out so that the finishing temperature of finish hot rolling is 850 to 1050°C.
  • the final hot rolling temperature within this temperature range, a small amount of fine "seeds" of the ⁇ -Cu phase can be easily precipitated uniformly in the cooling process after the final hot rolling.
  • the distribution of the ⁇ -Cu phase on the surface can be controlled as described above.
  • the finish hot rolling finish temperature is lower than 850° C., the fine “seeds” of the ⁇ -Cu phase are not sufficiently precipitated in the cooling step after the finish hot rolling finish.
  • the finish hot rolling finish temperature exceeds 1050°C, the structure becomes coarse and the workability and toughness are lowered.
  • multiple times of rolling and heat treatment are required to return the coarsened structure to a fine structure, which increases the manufacturing cost.
  • Other conditions in the hot rolling process may be appropriately set according to the composition of the slab, and are not particularly limited.
  • the cooling step is a step for precipitating fine “seeds” of the ⁇ -Cu phase. °C by cooling.
  • a small amount of fine “seeds” of the ⁇ -Cu phase can be uniformly precipitated in the precipitation temperature range (900 to 500° C.) of the ⁇ -Cu phase.
  • the fine "seeds" of the ⁇ -Cu phase preferentially grow in the heat treatment process, relatively large ⁇ -Cu phases are uniformly dispersed.
  • the distribution state of the ⁇ -Cu phase on the surface can be controlled as described above.
  • the average cooling rate is preferably 1 to 5° C./second, more preferably 2 to 4° C./second.
  • the cooling method in the cooling step is not particularly limited, and a method known in the art can be used.
  • the cooling temperature can be finely adjusted by controlling the amount of gas (for example, Ar gas) supplied to the heat insulating box.
  • the heat treatment step is a step of growing fine ⁇ -Cu phase “seeds” precipitated in the cooling step, and is performed by heating the hot-rolled material cooled in the cooling step at 750 to 850° C. for 4 hours or more. .
  • the heating time is preferably 6 to 48 hours, more preferably 8 to 36 hours.
  • the heating temperature is less than 750° C. or the heating time is less than 4 hours, the fine “seeds” of the ⁇ -Cu phase do not grow sufficiently, and the average grains of the ⁇ -Cu phase The diameter becomes too small.
  • the heating temperature exceeds 850° C., the ⁇ -Cu phase dissolves in the matrix phase.
  • a surface layer removing step of pickling and/or polishing may be further performed, if necessary.
  • the thickness of the surface layer to be removed in the surface layer removing step is not particularly limited and may be appropriately adjusted according to the composition of the slab. For example, when removing a Cr-poor layer, it is preferable to remove a surface layer having a thickness of 10 ⁇ m or more.
  • the austenitic stainless steel material is a cold-rolled material
  • cold rolling may be performed, followed by a cold rolling/annealing step of annealing within 300 seconds.
  • the surface layer removing process is performed after the heat treatment process
  • the cold rolling/annealing process may be performed after the surface layer removing process, or the surface layer removing process may be performed after the cold rolling/annealing process.
  • the conditions for cold rolling and annealing treatment are not particularly limited and may be appropriately adjusted according to the composition of the slab.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention can maintain antibacterial and antiviral properties for a long period of time, so it can be used for antibacterial and antiviral members.
  • the austenitic stainless steel material according to Embodiment 2 of the present invention can have a Vickers hardness of 190 Hv or less, it can be easily processed into a shape suitable for antibacterial/antiviral members.
  • the antibacterial/antiviral member of the present invention includes the above stainless steel material (for example, the ferritic stainless steel material according to Embodiment 1 of the present invention and/or the austenitic stainless steel material according to Embodiment 2 of the present invention).
  • the above stainless steel material used for this antibacterial/antiviral member may be processed into various shapes by methods known in the art.
  • the antibacterial/antiviral member of the present invention can further include members other than the stainless steel material described above.
  • the antibacterial/antiviral member is not particularly limited, but is used for kitchen equipment, home appliances, medical equipment, building interior building materials, transportation equipment, laboratory equipment, sanitary equipment, etc., and antibacterial and antiviral properties are required. and various members.
  • Stainless steels having a ferritic composition (the balance being Fe and impurities) of steel grades A to J shown in Table 1 were melted and forged into slabs, and then the finish hot rolling finish temperature was measured as shown in Table 2.
  • a hot-rolled material was obtained by hot-pressing to a thickness of 3 mm.
  • the hot-rolled material was wound into a coil, quickly placed in a heat-insulating box, and then cooled at an average cooling rate shown in Table 2 between 900 and 500°C.
  • the average cooling rate was adjusted by the amount of Ar gas supplied to the heat insulating box.
  • the cooled hot-rolled material was subjected to heat treatment using a batch annealing furnace in an air atmosphere at 800° C.
  • the heat-treated hot-rolled material is cut into pieces of 100 mm (rolling direction) x 100 mm (width direction) by cutting, then pickled to remove scales, and polished with a P400 buff (#400). A ferritic stainless steel material was obtained.
  • a disk having a diameter of 3 mm was cut out from a ferritic stainless steel material, one surface of which was ground to a thickness of 0.5 mm, and then the ground surface was electropolished to prepare a test piece.
  • TEM images were taken at 10 randomly selected points (total visual field area: 15 ⁇ m 2 ) on the electrolytically polished surface of this test piece, and then the TEM images were image-analyzed to measure the area of the ⁇ -Cu phase. .
  • the area ratio of the ⁇ -Cu phase was calculated by dividing the measured ⁇ -Cu phase area by the viewing area.
  • the equivalent circle diameter of the ⁇ -Cu phase (30 pieces) was obtained by image analysis of the TEM image obtained in the same manner as the area ratio above, and the average value was calculated to obtain the average particle diameter of the ⁇ -Cu phase. got
  • Antibacterial test antibacterial activity value
  • a test piece of 50 mm (rolling direction) ⁇ 50 mm (width direction) from the ferritic stainless steel material an antibacterial test was performed in accordance with JIS Z2801:2010 to obtain an antibacterial activity value (initial).
  • Staphylococcus aureus was used as bacteria
  • a polyethylene film of 40 mm ⁇ 40 mm was used as the adhesion film.
  • the inoculum amount of the fungus solution was 0.4 mL, and the entire surface of the test piece was lightly wiped with a local gauze soaked with ethanol having a purity of 99% or more just before the start of the test, and the test was performed after sufficiently drying. .
  • the test piece was immersed in 500 mL of water and held at 80 ° C. for 16 hours in a constant temperature bath. after immersion) was determined.
  • Antiviral test antiviral activity value
  • an antiviral test was performed in accordance with ISO 21702:2019 to determine the antiviral activity value (initial).
  • influenza A virus was used as the virus
  • a polyethylene film of 40 mm ⁇ 40 mm was used as the adhesion film.
  • the amount of virus suspension (test solution) inoculated was 0.4 mL, and just before the start of the test, the entire surface of the test piece was lightly wiped with a local gauze soaked with ethanol with a purity of 99% or more, and dried thoroughly. After that, the test was carried out.
  • test piece was immersed in 500 mL of water, held at 80 ° C. for 16 hours in a constant temperature bath, and then subjected to an antiviral test in the same manner as described above. Values (after immersion in water) were determined.
  • Vickers hardness Vickers hardness was measured according to JIS Z2244:2009.
  • a Vickers hardness tester HV-100 manufactured by Mitutoyo Co., Ltd. was used, the measurement load was 10 kg, the surface Vickers hardness was measured at 10 randomly selected points, and the average value was taken as the result. .
  • Table 3 shows the above evaluation results.
  • Stainless steels having an austenitic composition (the balance being Fe and impurities) of steel grades a to j shown in Table 4 were melted and forged into slabs, and the finish hot rolling finish temperature was measured as shown in Table 5.
  • a hot-rolled material was obtained by hot-pressing to a thickness of 3 mm.
  • the hot-rolled material was wound into a coil, quickly placed in a heat-insulating box, and then cooled between 900 and 500° C. at the average cooling rate shown in Table 5.
  • the average cooling rate was adjusted by the amount of Ar gas supplied to the heat insulating box.
  • the cooled hot-rolled material was subjected to heat treatment using a batch annealing furnace in an air atmosphere at 800° C.
  • the heat-treated hot-rolled material is cut into pieces of 100 mm (rolling direction) x 100 mm (width direction) by cutting, then pickled to remove scales, and polished with a P400 buff (#400). An austenitic stainless steel material was obtained.
  • the obtained austenitic stainless steel material was evaluated in the same manner as the above ferritic stainless steel material.
  • Table 6 shows the evaluation results.
  • the austenitic stainless steel materials 2-1 to 2-11 (examples of the present invention) had a predetermined composition and a distribution state of the ⁇ -Cu phase on the surface. Viral activity values (initial and after water immersion) and Vickers hardness results were all good. On the other hand, No. In the austenitic stainless steel material No. 2-12 (comparative example), the finish hot rolling finishing temperature was too low and the average cooling rate was too high, so that the average particle size of the ⁇ -Cu phase was too large. As a result, antiviral properties (antiviral activity value of 2.0 or more) were not obtained. No.

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Abstract

Ce matériau à base d'acier inoxydable présente une phase ε-Cu exposée sur la surface. La phase ε-Cu dans la surface du matériau à base d'acier inoxydable présente une fraction surfacique de 0,1 à 4,0 %, une taille moyenne de particules de 10 à 300 nm, et une distance inter-particules maximale de 100 à 1000 nm.
PCT/JP2022/011738 2021-03-26 2022-03-15 Matériau à base d'acier inoxydable et son procédé de fabrication, et élément antibactérien/antiviral WO2022202507A1 (fr)

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EP22775296.1A EP4317481A1 (fr) 2021-03-26 2022-03-15 Matériau à base d'acier inoxydable et son procédé de fabrication, et élément antibactérien/antiviral
MX2023011015A MX2023011015A (es) 2021-03-26 2022-03-15 Material de acero inoxidable, metodo para producirlo y miembro antibacteriano y antivirico.
CN202280006944.2A CN116368246A (zh) 2021-03-26 2022-03-15 不锈钢材料及其制造方法、以及抗菌/抗病毒构件
KR1020237014019A KR20230076838A (ko) 2021-03-26 2022-03-15 스테인리스 강재 및 그 제조 방법, 그리고 항균·항바이러스 부재
US18/260,513 US20240060151A1 (en) 2021-03-26 2022-03-15 Stainless steel material, method for producing same, and antibacterial and antiviral member

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JP2021-054054 2021-03-26
JP2021054052A JP2022151128A (ja) 2021-03-26 2021-03-26 フェライト系ステンレス鋼材及びその製造方法、並びに抗菌・抗ウィルス部材

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