The application limit for “modified” 13%Cr martensitic stainless steel (0.025C-13Cr-Ni-Mo) pipe and “conventional” 13%Cr steel (0.2C-13Cr) pipe in high temperature and high CO2 partial pressure environments is clarified. The critical CO2 partial pressure for modified 13%Cr steel pipe usage was significantly improved, being more than 15 MPa at 150 degree C comparing with that for conventional 13%Cr steel pipe of 0.5 MPa or less. Cr is most effective alloying element to prevent the CO2 corrosion at high temperature, and the CO2 corrosion resistance for modified 13%Cr steel pipe at severe sweet environment was evaluated by the equation of that CCI (CO2 corrosion Index) = Cr + 0.2 Ni + 0.25 Mo – 20C. The thin and tight surface films with concentration of Cr, Ni and Mo prevent the corrosion reaction at the steel surface and reduce the corrosion rate of steel at severe sweet environment.

Subject
Films, Corrosion prevention, Tubular goods, Steel surfaces, Piping, Corrosion rate, Corrosion testing, Partial pressures, Alloying elements, Steel pipes, Steel, Corrosion resistance, High temperature
Keywords:
martensitic stainless steel, Chromium Nickel Molybdenum seamless pipe, OCTG, carbon dioxide corrosion, high temperature pitting, corrosion film
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2004
Association for Materials Protection and Performance (AMPP)
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