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NACE MR0175 allow the use of Alloys S20100, S20200 and S20500?

Question:

Clause A.2.1 lists the required elements and ranges for austenitic stainless steels. Alloys S20100, S20200 and S20500 listed in table D1 do not meet the specified limits nor are they covered by individual approval. Is there any reason for these materials being listed in the aforementioned table?

Answer:

These alloys do not meet the requirements of A.2 so they are not covered by the ISO 15156-3 austenitic stainless steel limit tables. Annex D as stated in the standard is for information only. It is not a list of approved materials.

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

Reference: ISO 15156 Maintenance Panel Inquiry #2009-19

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