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Is UNS S66286 acceptable for tubing hanger according to NACE MR0175?

Question:

What grade of stainless steel meeting NACE requirements can be used for a tubing hanger when the pH is <3.5? My interpretation based on understanding of NACE MR0175/ISO 15156-3 Section A.8 Table A.26 is that only UNS S66286 is acceptable. Could you please confirm my statement or correct it?

Answer:

UNS S66286 is the only precipitation-hardenable stainless steel that is acceptable for tubing hangers in environments with pH <3.5. The martensitic stainless steels are also not acceptable for environments with pH <3.5.

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

Reference: ISO 15156 Maintenance Panel Inquiry #2004-13

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