NACE and chloride limits for austenitic SS.
NACE and chloride limits for austenitic SS.
(OP)
This is a specific question about NACE MR0175/ISO 15156-3:2003 which concerns the use of corrosion resistant alloys in oil and gas production. Table A.2 of that standard gives the environmental limits for the use of austenitic stainless steels. A maximum temperature of 60 deg C is given - presumably to avoid stress corrosion cracking - but with regard to chloride concentration limits it says "Any combination of chloride concentration and in situ pH occurring in production environments are acceptable". Can this be correct? My understanding is that more than a few hundred ppm chloride (even at room temperature, never mind 60 deg C) would cause severe pitting in 304L and 316L. The limits for crevice corroion would be even lower. Any explanation would be appreciated.





RE: NACE and chloride limits for austenitic SS.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: NACE and chloride limits for austenitic SS.
Yes at pH=4, 100ppm Cl, and no oxygen, 316 will pit at 30C, but that is another issue.
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Plymouth Tube
RE: NACE and chloride limits for austenitic SS.
Regards
RE: NACE and chloride limits for austenitic SS.
Don't feel bad; at least half of the inquiries that came to the T1 F1 (MR 01-75 committee) -years ago when I was on it- were regarding Chloride SCC of austenitics or general corrosion. There were endless discussions of how much "helpful" advice for these other conditions, should be in the document