Duplex stainless steel with ultrahigh antibacterial performance and preparation method of duplex stainless steel

Abstract

The invention aims to provide a duplex stainless steel material with ultrahigh antibacterial performance and a preparation method of the duplex stainless steel material. The duplex stainless steel material can have a function of effectively resisting high-concentration bacteria (>(8-9)*10<6>CFU / mL) in the heat treatment state of solid solution and aging, and the bacterial and microbial corrosion risks caused by duplex stainless steel in use are remarkably reduced. The stainless steel comprises chemical components: 22.0-25.0 of Cr, 4.5-7.5 of Ni, 1.5-3.0 of Mo, 2.0-4.0 of Cu, 1.0-2.5 of Ga, 0.2-0.3 of N, 0.03 or less of C, 1.0 or less of Si, 3.0 or less of Mn, 0.03 or less of P, 0.02 or less of S and the balance Fe. The duplex stainless steel can rapidly restrain bacterial reproduction in the service environment, the destroying risks of microbiological corrosion are relieved, and the duplex stainless steel can be widely applied to the fields of petroleum energy exploitation and oceanographic engineering where ultrahigh-concentration bacteria are contained, and is specifically applied to a storage container and a liquid conveying pipeline.

Description

technical field [0001] The invention relates to the technical field of duplex stainless steel materials, in particular to a duplex stainless steel with ultra-high antibacterial performance and a preparation method thereof. Background technique [0002] Duplex stainless steel is composed of ferrite and austenite in a complete solid solution state, which makes it have high strength, excellent toughness, good welding performance and excellent corrosion resistance, and has been widely used in petrochemical and marine engineering In special and harsh corrosive environments such as paper industry and paper industry, it has replaced traditional duplex stainless steel to a certain extent. Studies have found that in the service environment of duplex stainless steel, there are bacterial microorganisms, which can cause strong corrosion damage to materials, making microbial corrosion behavior widely concerned. [0003] The increasing development of antibacterial functional metal materi...

AI Technical Summary

Problems solved by technology

The use of antibacterial functional duplex stainless steel can inhibit or destroy the biofilm and greatly reduce the probability of microbial corrosion. However, due to the limitations of the current antibacterial functional stainless steel, the time to kill bacteria is too long and Limitation on the concentration range of inhibiting bacteria, this type of stainless steel will not be effective in the environment of higher concentration of bacteria

Images