FAQ's

What is the NACE MR0175 hardness limit for 17-4PH?

Compliance of NACE-Approved Control Valves in the Oil and Gas Industry

This page addresses an inquiry about the compliance of NACE-approved control valves in the oil and gas industry. The internal components of these valves include a part made from UNS S17400 (17-4 PH), which is subject to the hardness limit of 33 HRC described in Table A27 of Part 3 of the NACE MR0175/ISO 15156-3 standard.

Maximum Hardness Limit of 33 HRC Applies to Finished Component

The inquiry asks for guidance on how to rework the parts if they exceed the specified hardness limit. However, the maintenance panel does not provide consulting services for material processing issues and therefore cannot offer advice on reworking the parts. Nevertheless, the answer confirms that the maximum hardness limit of 33 HRC applies to the finished component.

Reference to ISO 15156 Maintenance Panel Inquiry #2011-16

This question relates to NACE MR0175/ISO 15156-3 A.8.2, Table A.27, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2011-16.

Update from 2016 Concerning NACE MR0175 2015 – Technical Circular 1

Lastly, the page includes an update from 2016 concerning NACE MR0175 2015 – Technical Circular 1, which has implications for 17-4 PH. If readers need any support or further information regarding 17-4 PH metallurgy, they can contact the team for assistance.

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