What are the NACE MR0175 limits for UNS S66286


Table A.26 limits the precipitation-hardened austenitic steel UNS S66286 to 150°F and 15 psi H2S when chlorides are present. a) Can this material be used at higher temperature if no chlorides are present?


No, it may not. The table states that the temperature restriction is for “Any combinations of chlorides . . . ” NACE MR0175/ISO 15156-3 does not define the expected performance of UNS S66286 in environments containing no chlorides.

This question is in relation to NACE MR0175/ISO 15156-3 A.8, Table A.26

Reference: ISO 15156 Maintenance Panel Inquiry #2005-02 Qa

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