Explanation

Generally, it refers to stainless steel with carbon content less than 0.03%. extra low carbon stainless steel has excellent corrosion resistance, especially the intergranular corrosion sensitive parts are very low, In order to avoid intergranular corrosion, the carbon content in steel must be controlled at a very low level, but the critical carbon content that does not cause intergranular corrosion is not absolute, but changes relative to the specific steel composition, medium conditions, steel product thermal history and other factors. Therefore, the carbon content control range of extra low carbon stainless steel must be determined according to the specific situation. For example, the carbon content control requirements of ferritic stainless steel are more stringent than those of austenilic stainless steel. At present, there are four levels of carbon content of ultra-low carbon stainless steel in China: O22 (the maximum carbon content is 0.030%), O19 (the maximum carbon content is 0.025%), O15 (the maximum carbon content is 0.020%), and O08 (the maximum carbon content is 0.010%). extra low carbon stainless steel is produced with selected raw materials and argon oxygen decarburization and vacuum oxygen decarburization refining methods.

Classification