With the development of society and economy, the stainless steel in the medical and health care, food industry applications of more and more widely, people in addition to the requirement for stainless steel corrosion resistant stainless, bright and clean as new, good mechanical properties and easy processing, etc, also put forward the requirement of mould, antibacterial, sterilization, etc. In the 1990 s, Japan famous stainless steel production factory new steel company in the world take the lead in research and development of a series of antibacterial stainless steel, become one of the major achievements in the history of stainless steel production.
Our country in 2003, the first developed independently by the Chinese academy of sciences shenyang institute of metal antibacterial stainless steel, filled the domestic blank, reached the similar materials of international advanced level. Subsequently, China's largest stainless steel production enterprises in taiyuan iron and steel company also have successfully developed antibacterial stainless steel products. Baosteel stainless steel branch began in early 2005, a high starting point to research and development of antibacterial stainless steel products, and cooperate with ningbo bao new stainless steel company baosteel, jointly developed cold rolled copper ferrite antibacterial stainless steel plate 430 cu.
Antibacterial stainless steel refers to adding a certain amount of antibacterial in ordinary stainless steel metal elements such as silver, copper, control of smelting, casting, forging, rolling and heat treatment process, make the antibacterial metallic elements in the stainless steel substrate at a certain size, shape, homogeneous precipitation, and ensure the precipitated phase volume percent, without reducing the mechanical properties of common stainless steel and corrosion resistance, endow them with excellent antibacterial properties.
Metal elements, silver antibacterial effect is best, but the price is more expensive, so the antibacterial stainless steel usually to add copper. Copper is the key element of antibacterial, how much should not only consider the antimicrobial properties, and to guarantee the stability of steel has good processing performance. Owing to the different steel grade, for the amount of copper in the best of baosteel successfully developed a brand of 430 cu ferrite antibacterial stainless steel which contains 1.5% copper.
Copper direct contact with bacteria is the precondition that the antibacterial sterilization, antibacterial stainless steel for this special heat treatment, the high concentration of copper precipitation from the matrix, uniform dispersion epsilon - Cu phase distribution. Polishing processing via the surface again, make epsilon - Cu exposure to the metal surface, thus the antibacterial effect. The antibacterial properties of eternal, even if the surface is worn away, material also has antibacterial effect.
Antibacterial stainless steel as structural materials and functional materials of dual characteristics, can be used as structure materials and decoration materials, at the same time also has the bacteriostasis sterilization self cleaning function. Relevant inspection department inspection results show that the antibacterial stainless steel for common bacteria such as e. coli, staphylococcus aureus, the sterilization rate of above 99%, and the toxicity and human body safety completely accord with technical standards. With antibacterial properties of stainless steel at the same time, the mechanics of materials, corrosion resistant, cold and hot machining, welding and other performance comparable to the original stainless steel. And antibacterial stainless steel, has important social value.
Antibacterial stainless steel is a wide range of application, such as beer, dairy, pharmaceutical, and other enterprises of equipment pipelines, storage tanks, kitchen utensils and tableware, washing machines, household appliances, medical equipment, food industry workbench and vessel, towel rack in everyday life, the bracket of freezer, the armrest of some of the facilities in public places such as buses, stair handrail, telephone booth, guardrail, etc should be used to prevent cross infection and antibacterial stainless steel.
Antibacterial principle of antimicrobial stainless steel:
Antibacterial metal ions from the metal surface precipitation, after contact with bacteria, with the role of cell damage cell membranes, the bacteria protein coagulation or damage to their DNA, destroy the balance of bacterial cells of normal and reproduction, and achieve the goal of prevent bacteria grow or destroy bacteria.
