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10312 Corrosion Fatigue Performance of Super 13 CR, Duplex 2205 and 2507 for Riser Applications

Picture for 10312 Corrosion Fatigue Performance of Super 13 CR, Duplex 2205 and 2507 for Riser Applications
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Product Number: 51300-10312-SG
ISBN: 10312 2010 CP
Author: Ramgopal Thodla, Feng Gui, Kenneth J. Evans, Carlos J. B. de M. Joia and Ilson Palmieri Baptista
Publication Date: 2010
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This work investigated the corrosion fatigue performance of 2507 duplex stainless steel for use as riser materials in environments containing high partial pressures of carbon dioxide (50 - 100 bar) and limited quantity of hydrogen sulfide (0 - 0.12 bar). The procedures developed for controlling oxygen and Fe2+ contamination as well as methods to evaluate the concentration of H2S in the autoclave are presented. The crack growth rates and DKth for these materials in the pressure environments were discussed along with procedures to obtain DKth, when they were below 5ksiÖin. Low crack growth rates in the range of 1e-8 in/cycle were measured and the effect of sour environments was quantified. The fatigue crack growth rate in sour environments on 2507 duplex stainless steel is a 10x higher than in air.

Key words: Corrosion fatigue, Fatigue Crack Growth Rate, 2507 Duplex Stainless Steels
This work investigated the corrosion fatigue performance of 2507 duplex stainless steel for use as riser materials in environments containing high partial pressures of carbon dioxide (50 - 100 bar) and limited quantity of hydrogen sulfide (0 - 0.12 bar). The procedures developed for controlling oxygen and Fe2+ contamination as well as methods to evaluate the concentration of H2S in the autoclave are presented. The crack growth rates and DKth for these materials in the pressure environments were discussed along with procedures to obtain DKth, when they were below 5ksiÖin. Low crack growth rates in the range of 1e-8 in/cycle were measured and the effect of sour environments was quantified. The fatigue crack growth rate in sour environments on 2507 duplex stainless steel is a 10x higher than in air.

Key words: Corrosion fatigue, Fatigue Crack Growth Rate, 2507 Duplex Stainless Steels
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