Antibacterial and antiviral stainless steel material and manufacturing method thereof

A manufacturing method, stainless steel technology, applied in the field of stainless steel materials and its manufacturing, can solve the problems of thin antibacterial layer, insufficient antibacterial persistence, etc., and achieve the effect of suppressing surface cracks and color change

Active Publication Date: 2022-04-15
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]However, in the method (C) above, special treatment methods such as coating and shot peening are used to impart antibacterial properties. There are issues in other aspects
Patent Document 5 also has the problems of thin antibacterial layer and insufficient antibacterial persistence

Method used

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  • Antibacterial and antiviral stainless steel material and manufacturing method thereof
  • Antibacterial and antiviral stainless steel material and manufacturing method thereof
  • Antibacterial and antiviral stainless steel material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] Hereinafter, examples of the present invention will be described. The present invention is not limited to the following examples.

[0082] The stainless steel whose chemical composition is shown in Table 1 was smelted, and the steel sheet was drawn out at 1230° C., followed by hot rolling to obtain a hot-rolled sheet with a thickness of 3 mm. Next, the hot-rolled sheet was annealed at 1100° C., pickled, and cold-rolled to obtain three kinds of cold-rolled sheets with a sheet thickness of 1.0 mm, 1.5 mm, and 2.0 mm. The obtained cold-rolled sheet was annealed at 1100° C. and pickled to obtain a cold-rolled annealed material. A test material having a size of 30 mm×30 mm was cut out from the cold-rolled and annealed material, and used as a test piece.

[0083] [Table 1]

[0084] (quality%)

[0085] steel C Si mn P S Ni Cr Mo Cu Nb N A 0.05 0.50 0.80 0.030 0.005 8.05 18.20 0.14 0.20 0.03 0.03 B 0.02 0.70 1.60 0.030 0.00...

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Abstract

Provided is a stainless steel material which contains an antibacterial component Cu, has excellent antibacterial and antiviral properties, and has a stainless steel color tone. The present invention is a stainless steel material having antibacterial and antiviral properties, in which a surface (1) and a surface layer (2) directly below the surface of the stainless steel material include a Cu-concentrated region (3) that follows grain boundaries and has a Cu (copper) concentration higher than the average Cu concentration of a base material, and the Cu-concentrated region (3) has a concentration higher than the average Cu concentration by 5 mass% or more. The stainless steel material has Cu grain boundary layers (6) extending continuously from the surface (1) of the stainless steel material at a depth of 10 [mu] m to 200 [mu] m, and the average number of the Cu grain boundary layers (6) is 2.0 or more per 100 [mu] m distance parallel to the surface in a cross-section orthogonal to the surface of the stainless steel material. The chromaticity index a * of the surface in the CIE Lab color space is 0-3.0 (inclusive).

Description

technical field [0001] The invention relates to a stainless steel material with antibacterial and antiviral properties and a manufacturing method thereof. Background technique [0002] Stainless steel is a material rich in corrosion resistance, so it is used in many fields. On the other hand, raw materials with antibacterial function are required for cleaning purpose and bacteria prevention in recent years. Conventional stainless steel for antibacterial use is known to include (A) the antibacterial component in the base material, (B) attaching the antibacterial component to the surface of the steel, and (C) physically mixing the antibacterial component into the base material. A technology to impart antimicrobial properties to stainless steel materials. In this specification, copper and silver may be described with respective element symbols "Cu" and "Ag". [0003] Regarding the method of the above (A), for example, Patent Document 1 can be cited. Patent Document 1 descri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C22C38/58C25D3/38C25D5/36C25D5/50
CPCC25D5/50C25D5/627C25D5/617C23C18/1637C23C18/38C23C18/1696C23C18/1698C25D3/38C25D5/36
Inventor 河野明训江原靖弘森本宪一末次辉彦
Owner NIPPON STEEL STAINLESS STEEL CORP
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