Corrosion classification of stainless steel

The corrosion performance classification of stainless steel refers to the classification of stainless steel materials according to their corrosion resistance in different environments. This classification can help us better understand the application range and characteristics of different types of stainless steel.

In the corrosion performance classification of stainless steel, the common classification criteria include the following aspects:

Corrosion resistance grade: According to the degree of corrosion of stainless steel under specific conditions, it can be divided into different levels. For example, commonly used corrosion resistance levels are C0, C1, C2, C3, C4, etc., where C0 means no corrosion at all, C1 means mild corrosion, C2 means moderate corrosion, C3 means severe corrosion, and C4 means very serious corrosion.

Use environment classification: according to the use of stainless steel environment, it can be divided into indoor stainless steel and outdoor stainless steel. Indoor stainless steel usually has good corrosion resistance and pollution resistance, which is suitable for decoration and equipment in indoor environment; Outdoor stainless steel pays more attention to its weather resistance and ultraviolet resistance, which is suitable for buildings and facilities in outdoor environments.

Chemical composition classification: The chemical composition of stainless steel also has a certain impact on its corrosion performance. Common stainless steel components include chromium (Cr), nickel (Ni), molybdenum (Mo) and other elements. Among them, chromium is one of the main elements to improve the corrosion resistance of stainless steel, while nickel helps to improve the heat resistance and toughness of stainless steel. In addition, the presence of molybdenum can further improve the corrosion resistance of stainless steel.

Surface treatment classification: In addition to the chemical composition, the surface treatment method of stainless steel will also affect its corrosion performance. Common surface treatment methods include polishing, pickling, electrolytic polishing, etc. These treatments can remove surface oxidation and dirt, improve the surface finish and corrosion resistance of stainless steel.

In summary, the corrosion performance of stainless steel is classified according to many factors such as its corrosion resistance grade, use environment, chemical composition and surface treatment method. By understanding these classifications, we can better choose stainless steel materials that suit our needs and give full play to their greatest advantages in practical applications.