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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...SCC OF SS316SCC OF SS316
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11/19/2005 9:00 AM
 
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I faced a problem in a Silica gel adsorbtion bed.The SS316 wire screens failed because of chloride induced stress corrosion cracking(SCC),according to the lab report.The unit operates at downstream of MDEA gas sweetening unit.The environment within the adsorber tower did not include exposure to chlorides but there was a chlorine peak on EDXspectra obtained from the crack indicates that exposure to chlorine did occur at some point in the screen service life.What effect can chlorine have on SS316 at an elevated temprature of 500 ° F ?
 
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11/23/2005 9:00 AM
 
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Dear Ayaz, The conditions given for the Cl induced SCC are as follow. 1. Cl ions> 50 ppm 2. temp> 65 Deg C 3. O2. 10 ppm 4. Residual stresses. Cl induced SCC normally happen in the presence of aqeous solution, but in the given circumstances you have high temperature and SCC can only happen during the shutdown and cooling time , when the moisture ingress or the dew point condensation takes place. do investigate the situation and let me have your feed back. Regards, shabbar Hussain Corrosion engineer
 
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