Metal corrosion problems are widespread in many areas of the national economy, such as oil and gas, petrochemical, transportation, machinery manufacturing, etc. It can be said that corrosion problems exist wherever metal materials are used. Metal materials are damaged by the action of surrounding media, which is called metal corrosion.

Silicon
The content of silicon in austenitic stainless steel is generally below 0.8% - 1.0%. As an alloy element, silicon content ranges from 2% to 7% depending on its use. Silicon is an element that strongly forms ferrite.

The ability of molybdenum to form ferrite is comparable to that of chromium. Molybdenum also promotes intermetallic compounds in stainless steels. In order to maintain a single austenite structure in austenitic stainless steel, the content of nickel, nitrogen, manganese and other austenite forming elements should be increased with the increase of molybdenum content in steel.