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96013 EFFECT OF MICROSTRUCTURE AND CR CONTENT IN STEEL ON CO2 CORROSION

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Product Number: 51300-96013-SG
ISBN: 96013 1999 CP
Author: Masakatsu Ueda, Akio Ikeda
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The effect of microstructure and Cr content in steels on CO2 corrosion was investigated by using steels containing Cr content from0 to 13 mass% melted in laboratory and Steels J55, N80 and L80(AP1 Grade) melted in the mill. Temperatures and H2S contamination were considered as environmental factor. In CO2 environments, the temperature giving a maximum corrosion rate, Tmax. existed in carbon and Cr steels. Tmax. increased together with Cr content, and Tmax. of 0, 1, 2 and 13% Cr steels was about 80, 100, 120 and 225 °C, respect ively. Because of this behavior, the relationship between Cr content and corrosion rate was linear at 60°C, but the corrosion rate was highest on the steel with around 1mass70 Cr at 100°C. H2S contamination for CO2 corrosion suppressed the corrosion rate and localized-corrosion in the temperature region whose corrosion rate showed a maximum value. It was clarified that this was related to the formation of Fe-sulfides from EPMA analysis and the volubility of the corrosion products. Concerning microstructure, Steel J55 with ferritic-pearlitic microstructure showed good corrosion resistance for localized-corrosion compared with Steel N80 and L80 with martensitic microstructure. Keywords: Martcnsitic steel, Ferritic-pcarlitic steel, Mesa corrosion, Ringworm corrosion, Carbon dioxide(CO2), Hydrogen sulfide(H2S), Oil country tubular goods(OCTG)
The effect of microstructure and Cr content in steels on CO2 corrosion was investigated by using steels containing Cr content from0 to 13 mass% melted in laboratory and Steels J55, N80 and L80(AP1 Grade) melted in the mill. Temperatures and H2S contamination were considered as environmental factor. In CO2 environments, the temperature giving a maximum corrosion rate, Tmax. existed in carbon and Cr steels. Tmax. increased together with Cr content, and Tmax. of 0, 1, 2 and 13% Cr steels was about 80, 100, 120 and 225 °C, respect ively. Because of this behavior, the relationship between Cr content and corrosion rate was linear at 60°C, but the corrosion rate was highest on the steel with around 1mass70 Cr at 100°C. H2S contamination for CO2 corrosion suppressed the corrosion rate and localized-corrosion in the temperature region whose corrosion rate showed a maximum value. It was clarified that this was related to the formation of Fe-sulfides from EPMA analysis and the volubility of the corrosion products. Concerning microstructure, Steel J55 with ferritic-pearlitic microstructure showed good corrosion resistance for localized-corrosion compared with Steel N80 and L80 with martensitic microstructure. Keywords: Martcnsitic steel, Ferritic-pcarlitic steel, Mesa corrosion, Ringworm corrosion, Carbon dioxide(CO2), Hydrogen sulfide(H2S), Oil country tubular goods(OCTG)
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02041 CORROSION RESISTANCE OF LOW Cr BEARING STEEL IN SWEET AND SOUR ENVIRONMENTS

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ISBN: 02041 2002 CP
Author: Hideki Takabe and Masakatsu Ueda
Publication Date: 2002
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Low Cr (3 to 5%) bearing steels have been developed and used in CO2 environment as materials to meet "Fitness for Purpose". However, the SSC and SCC resistance of low Cr bearing steel have not been clarified. This paper presents the effect of carbon content, microstructure, and tempering temperature on the SSC and SCC resistance as well as CO2 corrosion resistance of low Cr steel (3%Cr steel).

 
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