For the last 25 years, the use of 13% Cr seamless steel tubing has been a cost effective solution for preventing sweet CO2 corrosion. More recently, Super 13% Cr alloys with low carbon and Ni-Mo additions were introduced for improving the resistance to specific forms of corrosion. This paper summarizes the SSC results of both conventional 13% Cr and super 13% Cr stainless steels. NACE Uniaxial Tensile tests were performed according to the Fitness-For-Purpose approach recommended in the new edition of NACE MR0175/ISO 15156. The role of chloride content was investigated when combined with PH2S and pH in environments where SSC is likely to occur. These mappings enable the definition of usage domains for Super 13% Cr stainless steel in sour service.

Subject
Pits, Materials, Sodium chloride, Tensile tests, Sodium chloride solution, Current densities, Steel, Pitting, Corrosion resistance, Sulfide stress cracking, Chlorides, Corrosion potential, Types of corrosion
Keywords:
Martensitic stainless steel, 13% Cr, Super martensitic stainless steel, Super 13% Cr, Sulfide Stress Cracking (SSC), Stress Corrosion Cracking (SCC), electrochemistry, fitness-for-purpose (FFP), pH, hydrogen sulfide (H2S)
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2009
Association for Materials Protection and Performance (AMPP)
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