Oxidation behavior of 29Cr-8Ni ferritic stainless steel in air flow at 1173 and 1273 K

Abstract This work investigates the isothermal oxidation behavior of as casted 29Cr-8Ni ferritic stainless steel at 1173 and 1273 K for 126 ks at an air flow rate of 0.67 cm 3 × s −1 using thermogravimetric analysis (TGA). The oxidation resistance at both temperatures was similar. At 1173 and 1273 K, the kinetic mechanisms were cubic: between parabolic and logarithmic, and parabolic, respectively. The oxidation kinetic constants k at 1173 and 1273 K were 1.648 × 10 −4 and 8.152 × 10 −4 g × cm −2 × s −1 , respectively. The exponential growth rates n at 1173 and 1273 K were 0.3093 and 0.5692, respectively. The oxidation behavior of 29Cr-8Ni ferritic stainless steel was discussed and compared with that of as casted 26Cr-16Ni and as casted AISI 309 austenitic stainless steel.