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in NACE MR0175, is UNS S17400 acceptable for use in compressors?

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Question: NACE MR0175/ISO15156-3,Table A.30: Are wrought UNS S17400 and S15500 martensitic precipitation-hardenable stainless steels that meet the hardness and heat-treat requirements of this Table acceptable for use in compressors in sour environments with no environmental limits with respect to chloride content, partial pressure of H2S, temperature, and free elemental sulfur? QUESTION: If the answer to the former question is no, what are the specific environmental limits?


Yes, they are acceptable with no environmental limits in accordance with NACE MR0175/ISO 15156 Table A.30. No data have been submitted to verify resistance to cracking in the presence of elemental sulfur.

This question is in relation to NACE MR0175/ISO 15156-3 A.8.2, Table A.30

Reference : ISO 15156 Maintenance Panel Inquiry #2003-34

Update April 2016: NACE MR0175 2015 – Technical Circular 1 has implications for 17-4PH. Contact us for more details.

Are you using 17-4PH (UNS s17400) as a material for sour environments? We can provide support in 17-4PH metallurgy to safeguard the integrity of your asset.


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