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03257 Corrosion of Superaustenitic Stainless Steels in Chloride-and Sulfate-Containing Media-Influence of Alloying Elements Cr, Mo, N and Cu

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Product Number: 51300-03257-SG
ISBN: 03257 2003 CP
Author: Dieter Bauernfeind and Gregor Mori
Industry: Oil and Gas Production
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Superaustenitic steels with different Cr-, Mo-, N- and Cu-contents, which are mainly used in chemical industry, seawater applications and oil production, have been investigated in different chloride-containing media. Critical pitting and crevice temperatures (CPT and CCT, respectively) have been determined according to ASTM G 48. Electrochemical measurements for determination of CPT according to ASTM G 150 and immersion tests in chloride solutions at various temperatures and concentrations have been done. For means of comparison and better understanding of influence of different alloying elements additional immersion tests in sulfuric acid have been made as well. Materials investigated have been N08028, S31254 and three modified alloys. For means of comparison 316L stainless steel has been included in the study. Chromium content of alloys varies between 20 and 27%, molybdenum between 3.2 and 6.0%, nitrogen between 0.1 and 0.36% and copper between 0 and 1.1%. Results confirm an increase of corrosion resistance in chloride media with increasing Cr-, Mo- and N-content. The influence of each element on corrosion resistance is presented as well as CPT and CCT as a function of MARC ("Measure of alloying for resistance to corrosion") . An increase in copper content results in an increasing corrosion resistance in sulfuric acid. Keywords: Superaustenitic stainless steels, uniform corrosion, pitting corrosion, corrosion, CPT, CCT, PREN, MARC, ASTM G 31, ASTM G 48, ASTM G 150 crevice
Superaustenitic steels with different Cr-, Mo-, N- and Cu-contents, which are mainly used in chemical industry, seawater applications and oil production, have been investigated in different chloride-containing media. Critical pitting and crevice temperatures (CPT and CCT, respectively) have been determined according to ASTM G 48. Electrochemical measurements for determination of CPT according to ASTM G 150 and immersion tests in chloride solutions at various temperatures and concentrations have been done. For means of comparison and better understanding of influence of different alloying elements additional immersion tests in sulfuric acid have been made as well. Materials investigated have been N08028, S31254 and three modified alloys. For means of comparison 316L stainless steel has been included in the study. Chromium content of alloys varies between 20 and 27%, molybdenum between 3.2 and 6.0%, nitrogen between 0.1 and 0.36% and copper between 0 and 1.1%. Results confirm an increase of corrosion resistance in chloride media with increasing Cr-, Mo- and N-content. The influence of each element on corrosion resistance is presented as well as CPT and CCT as a function of MARC ("Measure of alloying for resistance to corrosion") . An increase in copper content results in an increasing corrosion resistance in sulfuric acid. Keywords: Superaustenitic stainless steels, uniform corrosion, pitting corrosion, corrosion, CPT, CCT, PREN, MARC, ASTM G 31, ASTM G 48, ASTM G 150 crevice
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