When choosing stainless steel in corrosive environments, the main factors that need to be considered in addition to the specific conditions of use of stainless steel are: stainless steel corrosion resistance, strength, toughness and physical properties, processing, formability, resources, prices And made easy. Corrosion resistance Corrosion resistance, including stainless steel and acid, alkali, salt and other corrosive media performance and high temperature oxidation, sulfide, chlorination, fluoridation and other properties.
1. Corrosion resistance standard is artificially determined, it is necessary to recognize it, use it, can not be bound by it, according to the specific requirements to determine whether the specific standard of corrosion resistance. At present, the corrosion resistance of stainless steel to use more than 10 standards, choose which level as a corrosion-resistant requirements, to consider the equipment, the Department of the characteristics (thickness, size).
2. Corrosion resistance is relative, conditional, often said the stainless steel stainless steel, corrosion resistance refers to refers to the rust and non-corrosion terms, is under certain conditions (medium, concentration, temperature, Impurities, pressure, flow rate and a certain time).
3. Select stainless steel not only to consider its general resistance to corrosion, but also consider its resistance to localized corrosion performance, in some aqueous media and chemical media, the latter should pay more attention because this is because the selection of personnel generally multi-valued stainless steel resistance General corrosion performance, and under the conditions of use, their sensitivity to local corrosion, such as stress corrosion pitting and so on are less considered; local corrosion of stainless steel corrosion resistance in the general good corrosion performance in general, the local Often lead to corrosion of stainless steel equipment, parts of the sudden destruction of its harm is much greater than the general corrosion.
4. In the application of various manuals on the corrosion resistance of stainless steel data, we should pay attention to a lot of data is only some of the experimental results, and the actual media environment often have a greater discrepancy, in order to get closer to the actual conditions of corrosion resistance Data, the actual medium should generally be carried out in the laboratory corrosion test or coupon test site conditions, but also when necessary, the simulation device test.
5. Stainless steel equipment, components, if corrosive failure, the cause of corrosion damage should be analyzed to identify the reasons for taking measures, rather than fling it.
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