A kind of high antibacterial ferritic stainless steel and preparation method thereof

Abstract

The invention aims to provide a high antibacterial ferritic stainless steel material and a preparation method thereof. The high antibacterial ferritic stainless steel material has the function of effectively resisting high concentration bacteria (more than (1-2)*10<6>CFU / mL) under conditions of solid solution and aging heat treatment, and significantly reduces the risk of corrosion of bacterial microorganisms caused by the use of ferritic stainless steel. The stainless steel comprises the chemical compositions of 17.5-19.5% of Cr, 1.9-2.5% of Mo, 2.0-4.5% of Cu, 1.0-2.5% of Ga, less than or equal to 0.035% of N, less than or equal to 0.025% of C, less than or equal to 1.0% of Si, less than or equal to 1.0% of Mn, less than or equal to 0.04% of P, less than or equal to 0.03% of S and the balance Fe. The high antibacterial ferritic stainless steel can be widely used in food and chemical industries and civil liquid transportation pipes or storage containers which contain the bacteria.

Description

technical field [0001] The invention relates to the technical field of ferritic stainless steel materials, in particular to a novel antibacterial ferritic stainless steel and a preparation method thereof. Background technique [0002] Ferritic stainless steel has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. It is mostly used to manufacture parts or airtight containers that are resistant to atmospheric, water vapor, water, and oxidative acid corrosion. In the application field where only austenitic stainless steel can be used in the past, ferritic stainless steel is an excellent alternative material. Ferritic stainless steel does not contain Ni, and its main elements are Cr (>12%) and Fe. Cr is the starting material for stainless steel. The main element to corrosion resistance, its price is low and relatively stable. Since ferritic stainless steel is suitable for both ...

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Problems solved by technology

However, the current application of antibacterial functional stainless steel has two application limitations, such as figure 1 Shown: (a) For bacterial concentration lower than (1-2)*10 5 The killing time of the low concentration of CFU / mL bacteria and microorganisms needs to be as long as 24 hours; (b) the bacterial concentration is higher than (1-2)*10 6 CFU / mL of high concentration of bacteria and microorganisms can not achieve more than 90% sterilization rate

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