What Is The "protection" Technology For The Surface Of Stainless Steel Valves?

3 Piece Threaded Ball Valve participates in the safety protection of the system. When the system pressure exceeds the specified value, the stainless steel valve opens and part of the medium is discharged. Therefore, the stainless steel valve acts as an overpressure protection device in the system.

The corrosion resistance of steel is determined by chromium, but since chromium is one of the components of steel, the protection method is different. All metals react with oxygen in the atmosphere to form an oxide film on the surface. Unfortunately, the iron oxide formed by ordinary carbon steel continues to oxidize, corrosion continues to grow, and then pores are formed. For electroplating, paint or anti-oxidation metals (zinc, nickel, chromium, etc.) can be used to fix the surface of carbon steel, but this protective layer is very thin. If the protective layer is damaged, the base steel will begin to rust. When the addition of Cr reaches 10.5%, the atmospheric corrosion resistance of steel is significantly improved, but even if the Cr content is high, the corrosion resistance is improved, but it is not clear.

The reason is that alloying steel with chromium changes the type of surface oxide, similar to the oxide formed on pure chromium metal. This firmly attached chromium-rich oxide protects the surface and prevents further oxidation. This oxide layer is very thin, and you can see the natural luster of the steel surface, giving stainless steel a surface.

And when the surface layer is damaged, the exposed steel surface reacts with the atmosphere to self-repair, thereby reforming the oxide "passivation film" and continuing to play a protective role.

Therefore, all stainless steel elements have common characteristics. That is, the chromium content exceeds 10.5%. Stainless steel valves can feel their durability. Corrosion resistance and good toughness are important characteristics of stainless steel and are important factors in its widespread use.