Stainless steel pipe surface treatment process
Date:2023-12-06View:346Tags:Stainless steel hollow section,Stainless steel rectangular&square tube,Welded stainless steel pipe
Improving the surface quality of stainless steel pipes includes improving the surface morphology and structure and reducing the number of interlayers. Common surface treatment methods currently on the market include mechanical drawing, mechanical grinding, polishing and burning.
mechanical drawing
Mechanical drawing uses precision cold drawing of plugs to increase the surface roughness of the pipe. This can improve the surface structure of the pipe, but this will not improve the morphological structure, energy level and number of interlayers of the stainless steel pipe. This is a basic surface treatment process, and the roughness formed by processing is also the basis for other more complex surface treatment processes.
feather cloth polishing
This treatment method is often used to improve the surface brightness of decorative stainless steel pipes. However, although the Ra value may be very good, many cracks can be seen under an electron microscope. The actual surface area expands, and there will be separated ferrite and martensite locally. body tissue. The surface of stainless steel pipe contains many impurities, such as abrasive particles. In addition, because polishing paste is used, a lot of energy will be stored in the depressions produced, resulting in an increase in the number of media.
mechanical grinding
Mechanical grinding uses precision grinding to improve the surface roughness of stainless steel pipes. It can optimize the surface structure of the pipe but does not improve its morphological structure, energy level and number of interlayers.
Pickling or passivation
After pickling or passivation of stainless steel pipes, the surface roughness will not be increased, but the remaining particles on the pipe surface can be removed and the energy level can be reduced, but the number of interlayers will not be reduced.
Bright and dull
High-temperature heat treatment of stainless steel pipes under hydrogenation or vacuum can not only eliminate the internal stress of the pipe, but also produce a passivation film on the surface of the stainless steel pipe, thereby improving the morphological structure and reducing the energy level, but it will not increase the surface roughness. Spend.
Sub-electrochemical polishing
This method is to add a surface treatment process to the BA surface, which is a light electrolytic polishing process, so as to reduce the surface area as much as possible and thicken the passivation film to improve corrosion resistance and optimize the stainless steel pipe. surface morphology and reduced energy levels. Although the surface of the stainless steel pipe treated in this way is not as bright as before, its surface quality is greatly improved without the generation of particles and reduction in the composition of surface iron and iron oxide.
electrochemical polishing
Through electrochemical polishing, the surface morphology and structure of stainless steel pipes can be greatly improved, and the actual surface area of the pipe can be reduced to a large extent. The surface of the stainless steel pipe is a fully protected chromium oxide film, its energy is close to the normal level of the alloy, and the amount of media will also be reduced to a minimum.
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