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51316-7631-Unexpected Sour Cracking Resistance of Duplex and Superduplex Steels

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Product Number: 51316-7631-SG
ISBN: 7631 2016 CP
Author: Gerit Siegmund
Publication Date: 2016
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Title: Unexpected Sour Cracking Resistance of Duplex and Superduplex SteelsThe SSC and SCC performance of duplex steel UNS S31803 (1.4462) and superduplex steel UNS S32760 (1.4501) was tested with welded round tensile bars under constant load of 90% AYS (measured at the test temperature) fully submerged in brines with 10 to 40 g/L chloride in the presence of 150 mg/L bicarbonate under partial pressures (at test temperature) of 5 bar CO2 plus 0.5 to 1 bar H2S at temperatures of 28.5 90 130 and 180°C with an exposure time of 720 h. In none of the corrosion systems tested cracking was observed. Moderate localized surface activation was encountered yielding mostly shallow pits due to selective phase dissolution. It appears that the performance profile of these groups of stainless steels is still not completely known specifically at higher temperatures and is obviously largely underestimated.
Title: Unexpected Sour Cracking Resistance of Duplex and Superduplex SteelsThe SSC and SCC performance of duplex steel UNS S31803 (1.4462) and superduplex steel UNS S32760 (1.4501) was tested with welded round tensile bars under constant load of 90% AYS (measured at the test temperature) fully submerged in brines with 10 to 40 g/L chloride in the presence of 150 mg/L bicarbonate under partial pressures (at test temperature) of 5 bar CO2 plus 0.5 to 1 bar H2S at temperatures of 28.5 90 130 and 180°C with an exposure time of 720 h. In none of the corrosion systems tested cracking was observed. Moderate localized surface activation was encountered yielding mostly shallow pits due to selective phase dissolution. It appears that the performance profile of these groups of stainless steels is still not completely known specifically at higher temperatures and is obviously largely underestimated.
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