What is the relationship between the improvement of high temperature resistance of stainless steel coils and surface treatment?

There is a close relationship between the high temperature resistance and surface treatment of stainless steel coils. Surface treatment not only improves the appearance and corrosion resistance of stainless steel, but also significantly improves its performance in high-temperature environments. Through specific surface treatments, the high-temperature properties of stainless steel can be enhanced, especially in terms of oxidation, corrosion resistance and thermal stability. 
Passivation treatment removes tiny iron impurities from the surface of stainless steel through chemical methods (usually using an acidic solution) and forms a dense chromium oxide film on the surface. This oxide film can effectively improve the corrosion resistance of stainless steel, especially under high temperature conditions.
At high temperatures, the passivation film protects stainless steel from oxidation and corrosion, especially in oxygen-containing or chemically corrosive environments. Passivation treatment can form a more stable oxide layer at high temperatures, helping to extend the service life of stainless steel in high temperature environments. The passivation film can reduce the oxidation and shedding of chromium at high temperatures and ensure the high temperature resistance of stainless steel.

Electropolishing is an electrochemical process that removes tiny irregularities from the surface of stainless steel, making it smoother and glossier while enhancing its corrosion resistance. Electrolytic polishing can remove microscopic defects such as small cracks and burrs on the surface, reduce oxidation and corrosion caused by surface unevenness, and thereby improve stability at high temperatures. The smooth surface reduces the deposition of oxides and the formation of irregular oxide films, thereby improving the high-temperature corrosion resistance of stainless steel. By reducing surface contaminants and tiny pores, electropolishing can effectively improve the thermal stability and corrosion resistance of stainless steel at high temperatures.
Sandblasting produces a rough textured effect by spraying high-velocity particles onto the stainless steel surface. While this treatment is primarily used to improve appearance and increase adhesion, it can also help with high-temperature performance. The surface of stainless steel after sandblasting is roughened, which increases the surface contact area, which helps the adhesion of coatings or oxide films and improves corrosion resistance at high temperatures. A rough surface can increase the rate of heat diffusion and avoid local overheating, thereby reducing thermal stress in high-temperature environments.
Brushing is a process that uses abrasive belts or grinding wheels to form fine line textures and is often used to improve the aesthetics and wear resistance of stainless steel. Brushed surfaces usually have a certain roughness and texture.
Due to its texture structure, the brushed surface can effectively reduce scratches and corrosion adhesion at high temperatures, which is helpful to improve high temperature resistance. The wire drawing treatment can promote the uniform oxidation of the stainless steel surface and form a stable oxide film, thus improving its corrosion resistance in high temperature environments.
Coatings are often applied to enhance the corrosion resistance of stainless steel and prevent oxidation or corrosion, especially when used in extremely high-temperature environments. Common coatings include high temperature resistant coatings, ceramic coatings, etc.

The coating can provide an additional protective film in high-temperature environments, prevent oxidation reactions, reduce surface corrosion, and extend the service life of stainless steel. Certain coatings, such as ceramic coatings, can provide excellent high-temperature protection, enhance the stability of stainless steel under high-temperature conditions, and prevent deformation, failure or corrosion at excessive temperatures. Coatings can improve the resistance of stainless steel to thermal shock, especially in environments with large temperature fluctuations, and prevent the stainless steel surface from cracking due to rapid heating or cooling.
Heat treatment (such as annealing) can eliminate internal stress, optimize the grain structure, and improve its mechanical properties and high temperature resistance by heating stainless steel to a specific temperature and then slowly cooling it.
Heat treatment can improve the thermal fatigue resistance of stainless steel, making it more stable in environments with high temperatures and large temperature differences, and reducing cracking or deformation caused by thermal stress. Through heat treatment, the microstructure of stainless steel is improved so that it can maintain high strength and toughness at high temperatures. Heat treatment can help remove harmful elements on the surface of stainless steel, such as carbides or other impurities, and improve oxidation stability in high-temperature environments.
Through different surface treatment methods, the high temperature resistance of stainless steel coils can be significantly improved. Therefore, according to the specific needs of the application scenario, choosing an appropriate surface treatment method can effectively improve the high temperature resistance of stainless steel coils and extend their service life.