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98094 THE APPLICATION LIMITS OF ALLOYED 13%Cr TUBULAR STEELS FOR DOWNHOLE DUTIES

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Product Number: 51300-98094-SG
ISBN: 98094 1998 CP
Author: P. J. Cooling, M. B. Kennani, J. W. Martin, P. I. Nice
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In the past few years, a new family of materials has entered the downhole tubular market, known as the “alloyed 13%Cr steels”. These are a development of the conventional API 5CT grade 13%Cr steels to which alloying elements of Ni, Mo and Cu have been added, hence offering a number of advantages. In the present paper, domains of application for the 95ksi grade alloyed 13%Cr steels with respect to sour service conditions have been defined on pH vs. H2S partial pressure plots. Corrosion properties have also been determined for two other aspects; chloride stress corrosion cracking (ClSCC) and high temperature corrosion resistance. The results have reiterated the importance of solution chemistry, pH and H2S partial pressure in defining the corrosion properties of steels. Keywords: Alloyed 13%Cr tubular steels, corrosion, sour service, chloride stress corrosion cracking, sulphide stress cracking.
In the past few years, a new family of materials has entered the downhole tubular market, known as the “alloyed 13%Cr steels”. These are a development of the conventional API 5CT grade 13%Cr steels to which alloying elements of Ni, Mo and Cu have been added, hence offering a number of advantages. In the present paper, domains of application for the 95ksi grade alloyed 13%Cr steels with respect to sour service conditions have been defined on pH vs. H2S partial pressure plots. Corrosion properties have also been determined for two other aspects; chloride stress corrosion cracking (ClSCC) and high temperature corrosion resistance. The results have reiterated the importance of solution chemistry, pH and H2S partial pressure in defining the corrosion properties of steels. Keywords: Alloyed 13%Cr tubular steels, corrosion, sour service, chloride stress corrosion cracking, sulphide stress cracking.
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