Corrosion Behavior Of Ferritic-Martensitic Steels Simp And T91 In Fast-Flowing Steam

The oxidation behavior of ferritic-martensitic steels was investigated by exposure to 500 degrees C steam with a flow rate of 5 m/s. The oxidation kinetic curves followed near-parabolic rate equation and a type of Si modified steel SIMP displayed better oxidation resistance than T91. In the 5 m/s steam, the oxidation rate was significantly enhanced and the formation of hematite was also promoted at relatively low dissolved oxygen of 100 ppb. The results indicated that not only the alloy composition and dissolved oxygen but the flow rate played an important role in the corrosion behavior of ferritic-martensitic steels.