Stainless steel metal hose anti-corrosion coating role

Stainless steel metal hose anti-corrosion coating role
Selection of stainless steel metal hose in general, the stainless steel metal hose material working conditions, the basic function of steel and the relevant experience in the use of the three integrated trade-offs after the initial selection of available steel, in the absence of actual experience in the use of learning, the initial selection of stainless steel metal hose material for imitation experiments or field hanging experiments, based on these experimental results to make the final selection, the use of some particularly important, need to be imitated Body experiments before making a final decision on the selection of materials. Reasonable selection of stainless steel metal hose procedures can refer to the following conditions, to understand the operating conditions of stainless steel metal hose contains; temperature, media composition, stress conditions, manufacturing process, planning life, special requirements.
Look at the material function and related data, room temperature, high temperature mechanical function, corrosion resistance function, process function, physical function, price elements, the degree of difficulty of supply. Thirdly, look at the moment experience; the running experience of the acquaintance condition, the results of field hanging, laboratory imitation experiment, and the results of mimic body running. In the above procedures, the operating conditions are felt to select the elements of stainless steel metal hose category. Temperature if in low temperature, it is not suitable to choose ferritic stainless steel metal hose and duplex stainless steel metal hose, in 300-500 ℃ for a long time operation, it is also not suitable to select the choice of duplex stainless steel metal hose and the customary high chromium ferritic stainless steel metal hose. If the requirement of non-magnetic, only austenitic stainless steel metal hose can be selected; in the requirement of high strength, high hardness non-magnetic components, martensitic and deposition hardening stainless steel metal hose is the only choice; in both the requirement of high strength and non-magnetic components, only austenitic deposition hardening austenitic stainless steel metal hose can be selected. After the confirmation of the steel category, according to the requirements of the equipment or parts of various functions, the choice of compatible stainless steel metal hose trademark. Generally can be selected to the appropriate trademark, when there is no corresponding stainless steel metal hose trademark selection, only in the corrosion-resistant alloy selection or research and development of new stainless steel metal hose trademark.
All metals in the atmosphere can react with oxygen to form an oxide film on the surface, and the formation of ordinary carbon steel on the iron oxide continues to oxidize, so that corrosion continues to expand and form a cavity. Can use paint or oxidation-resistant metal for electroplating to protect the surface of carbon steel, but this protective layer is a thin film, if the protective film is destroyed, the following steel will begin to corrode again. Stainless steel metal hose does not corrode with the chromium content of the steel. Steel chromium content of 12%, in the atmosphere, stainless steel metal hose surface generated a layer of passivation, dense chromium-rich oxide and protection of the surface to prevent further in the oxidation. This layer of oxide film is thin, through which the natural luster of the steel surface can be seen, so that the stainless steel metal hose has a unique surface. If the chromium film once the destruction of steel chromium and atmospheric oxygen re-formed into a passivation film to continue the protective effect. In some special environment, stainless steel metal hose will also appear some local corrosion and failure, but stainless steel metal hose and carbon steel is different, there will be no uniform corrosion and failure, so the corrosion margin is meaningless for stainless steel metal hose.