What does “17-4PH service tool applications mean” in NACE MR0175 Table A.28,?

Question: Can you provide clarification on NACE MR0175/ISO 15156-3, Table A.28: “UNS S17400 …. has been used in service tool applications at the surface when stressed at less than 60% of its minimum specified yield strength under working conditions.” This Table also lists “Internal Components for Valves, Pressure Regulators, and Level Controllers”. What exactly do service tool applications encompass?


This paragraph is intended to apply to components that are temporarily installed at the surface as part of routine well servicing. For example, components of wireline valves used during a wireline job are considered as service tools.

This question is in relation to NACE MR0175/ISO 15156-3 A.8.2, Table A.28

Reference: ISO 15156 Maintenance Panel Inquiry #2003-32

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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