High Temperature Degradation of Thermal Oxides on AISI 304 Stainless Steels by Carbon

Abstract

AISI 304 austenitic stainless steel specimens are oxidised in laboratory air at 750 °C for 48 h. They are further subjected to the reduction test in carbon at 1350 °C for 30 and 60 min. The results show that the mass gain of the oxidised AISI 304 slighter increases to be 0.08 mg cm–2 after the reduction for 30 min and is unchanged at the longer reduction period up to 60 min. The oxide on AISI 304 is deteriorated after the reduction but its morphology tends to be unchanged when the reduction period is longer from 30 to 60 min. The results then indicate the superior performance of the AISI 304 to combat the corrosion under carbon at this high temperature.

The high temperature degradation of ferritic stainless steel in solid carbon atmospheres

“…Using ferritic stainless steel at high temperatures is one possible way to reduce material costs for general stainless-steel components under low aggressive environments in power plants. However, intergranular corrosion and deterioration of passive film may present during the combustion process due to carbon diffusion [9][10][11]. Solid carbon from soot particles can diffuse into austenite grain at temperatures between 830℃ to 1400℃ and form chromium carbide along grain boundaries following Equation (1-3) [5,12,13].…”