Corrosion Behavior of 304LN Stainless Steel in High‑Temperature Supercritical Carbon Dioxide Oxidation and Carburization

The corrosion behavior of 304LN austenitic stainless steel in supercritical CO2 at 650 °C was investigated. The results show that 304LN follows Wagner’s law kinetics, forming a protective oxide flm consisting of SiO2, (Cr, Mn)3O4, and Cr2O3 from the inner to outer layers. A shallow carburization depth of approximately 130 nm indicates excellent resistance to carburiza￾tion. The roles of key elements in 18/8 austenitic stainless steel represented by 304LN, such as Cr, Ni, and Si, were analyzed, highlighting their contributions to anti-carburization performance and corrosion resistance under harsh conditions.