FAQ's

NACE MR0175, austenitic stainless steels, Table A.2 and the technical circulars.

We have a full article on the latest revision of NACE MR0175 2015, make sure you read the full article as it addresses austenitic stainles steels.

Question: NACE MR0175/ISO 15156-3: 2009(E) Table A2 & NACE MR0175/ISO 15156-3: 2009/Cir.2:2013(E), Table A2 As long as the partial pressure of H2S is below 15 psi and Flowing medium temperature is below 140 DEG F Any combinations of chloride concentration and in situ pH occurring in production environments are acceptable and materials as suggested under clause A2 “Austenitic stainless steels” can be selected.

Answer:

As long as your definition of “Flowing medium temperature” is “exposure temperature” your interpretation is correct. Note that these materials shall be of type described in A.2, shall be in the solution-annealed and quenched, or annealed and thermally-stabilized heat-treatment condition, be free of cold work intended to enhance their mechanical properties, and have a maximum hardness of 22 HRC.

This question is in relation to NACE MR0175/ISO 15156-3 Table A.2

Reference: ISO 15156 Maintenance Panel Inquiry #2015-02 Q2 & Q3

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