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09084 Sour Service Limits of 13% Cr and Super 13% Cr Stainless Steels for OCTG: Effect of Environmental Factors

Wednesday, March 25, 2009: 2:25 PM
C304 (Georgia World Congress Center)
Herve Marchebois , Vallourec Research Center, Aulnoye Aymeries, France
Hafida El Alami , Vallourec Research Center, Aulnoye Aymeries, France
Jean Leyer , Vallourec Research Center, Aulnoye Aymeries, France
Bertine Orlans , Vallourec Research Center, Aulnoye Aymeries, France
Arnaud Gateaud , Vallourec Research Center, Aulnoye Aymeries, France

For the last 25 years, the use of 13% Cr seamless steel tubing has been a cost effectivesolution 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/ISO15156. 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.

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