Abstract
The stress corrosion cracking susceptibility of duplex stainless steel (DIN W.St. no. 1.4462) in various H 2S-, CO 2- and chloride-containing media has been investigated with slow strain rate test techniques at 20, 80 and 160°C. The objective of this investigation was to determine limiting conditions for the application of this material in sour environments. It was found that duplex stainless steel at its free corrosion potential is susceptible to stress corrosion cracking in the media of our tests only at temperatures higher than 80° and when subjected to a slow plastic strain rate. This was observed at H 2S partial pressures as low as 0.1 bar. The stress corrosion cracking mechanism of duplex stainless steel in H 2S-, CO 2- and Cl −1-containing environments conforms to a combination of repetitive slip-step emergence/anodic dissolution and hydrogen embrittlement.
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