The stainless characteristic of stainless steel is due to the special passivation protective film on the surface of the steel plate. First, the corrosion resistance mechanism of stainless steel, that is, the theory of passivation film, is briefly introduced. The so-called passive film is a thin film mainly composed of Cr2O3 on the surface of stainless steel. Due to the existence of this film, the corrosion of the stainless steel substrate in various media is hindered, and this phenomenon is called passivation. There are two cases for the formation of this passivation film. One is that stainless steel itself has the ability of self-passivation, and this self-passivation ability is accelerated with the increase of chromium content. Another broad formation condition is that stainless steel forms a passivation film in the process of being corroded in various aqueous solutions (electrolytes), which hinders corrosion. Generally, the corrosion types of stainless steel are divided into two categories: uniform corrosion and local corrosion. With the popularization of stainless steel in people’s lives, a new corrosion type – “rust” is derived. 1. Uniform corrosion Uniform corrosion means that all the exposed metal surfaces in the corrosive environment undergo electrochemical or chemical reactions and are uniformly...
At the end of the last century, Japanese stainless steel manufacturers found through research that adding a certain antibacterial metal to stainless steel, after proper heat treatment, can obtain stainless steel with long-term stable antibacterial properties. In 1998, Rixin Iron and Steel Company successfully developed ferritic antibacterial stainless steel NSSAM1, martensitic antibacterial stainless steel NSSAM2 and austenitic antibacterial stainless steel NSSAM3, forming a copper-containing antibacterial stainless steel series. In the same year, Kawasaki Steel successfully developed silver-containing antibacterial stainless steel. The Stainless Steel Branch of Baosteel Co., Ltd. officially established the project in January 2005 under the above-mentioned market and technical background, and started the research and development of ferritic antibacterial stainless steel 430Cu product characteristics. Copper, and in the manufacturing process, special heat treatment is adopted, so that the stainless steel can evenly disperse the fine copper precipitates Fe-Cu from the surface to the interior, so that the stainless steel can obtain good antibacterial and sterilizing properties while ensuring its basic performance. performance. 430Cu maintains its original mechanical properties, corrosion resistance and good cold and hot working properties, and its strength is higher than that of ordinary 430 stainless steel, and when the elongation properties are equivalent, the cold...
Stainless steel protective film is a large number of stainless steel consumables used in the field of stainless steel processing, production and circulation. Generally, stainless steel materials that have undergone surface processing basically need to be protected by stainless steel protective film. Let’s take a look at how to paste stainless steel film. Main points of stainless steel production and processing manufacturers using stainless steel protective film 1. Ordinary stainless steel protective film: only used to protect the stainless steel surface Usually on the most commonly used surfaces, stainless steel frosted surface, stainless steel brushed surface, stainless steel mirror BA surface; usually the frosted brushed surface should be pasted with a stainless steel protective film with a slightly higher viscosity, generally above 70 sticks. The stainless steel mirror panel BA board needs to be pasted with a stainless steel protective film with a lower viscosity, generally below 40, and different viscosity protective films should be pasted according to different materials and the surface finish of the stainless steel plate. 2. Stainless steel protective film (laser film) for laser: usually used for laser cutting of stainless steel plate In general, the stainless steel plate used for stainless steel laser cutting cannot...
1) The content of alloying elements, generally speaking, when the content of chromium is 10.5%, steel is not easy to rust. Chrome Nickel The higher the content, the better the corrosion resistance. For example, the content of nickel in 304 material is 8-10%, and the content of chromium is 18-20%. Such stainless steel will not rust under normal circumstances. 2) The smelting process of the manufacturer will also affect the corrosion resistance of stainless steel. A large stainless steel plant with good smelting technology, advanced equipment and advanced technology can ensure the control of alloying elements, the removal of impurities, and the control of the cooling temperature of the billet, so the product quality is stable and reliable, the internal quality is good, and it is not easy to rust. On the contrary, some small steel mills have backward equipment and backward technology. During the smelting process, impurities cannot be removed, and the products produced will inevitably rust. 3) The external environment, the climate is dry and ventilated, and the environment is not easy to rust. The air humidity is high, continuous rainy weather, or environmental areas with high pH in the air are prone to rust. 304 stainless...
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