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51313-02235-Pit Metastability and SCC Susceptibility Assessment of Austenitic SS in Sour Gas Service Conditions

Product Number: 51313-02235-SG
ISBN: 02235 2013 CP
Author: Ray Case
Publication Date: 2013
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To assess the susceptibility of series 300 stainless steels to stress corrosion cracking under sour service conditions a stochastical model is developed. The model is based in the hypotesis that the critical conditions for crack initiation and propagation are satisfied by the presence of metastable pit regime found in H2S containing environment.
The model determines the probability of cracking by forecasting the most likely elapsed time to achieve sustained crack growth. The boundary conditions for the stochastical model are provided by the experimental evaluation of the pit survival rate using weak potentiostatic polarization up to 100 mV above the open circuit potential.
To validate the model service conditions similar to actual field cases of stress corrosion cracking were simulated experimentally. The model forecasts were in agreement with typical field times to failure within 95% certainty in all the occasions evaluated.
 

To assess the susceptibility of series 300 stainless steels to stress corrosion cracking under sour service conditions a stochastical model is developed. The model is based in the hypotesis that the critical conditions for crack initiation and propagation are satisfied by the presence of metastable pit regime found in H2S containing environment.
The model determines the probability of cracking by forecasting the most likely elapsed time to achieve sustained crack growth. The boundary conditions for the stochastical model are provided by the experimental evaluation of the pit survival rate using weak potentiostatic polarization up to 100 mV above the open circuit potential.
To validate the model service conditions similar to actual field cases of stress corrosion cracking were simulated experimentally. The model forecasts were in agreement with typical field times to failure within 95% certainty in all the occasions evaluated.
 

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