NACE MR0175 and HIP materials used in valve components?
Can HIP Materials Fulfill Sour Service Requirements According to NACE MR0175/ISO 15156-3?
Introduction
This page provides an answer to an inquiry regarding the use of HIP materials in valve components for sour service, which have been listed in Tables A.24 and A.33 of NACE MR0175/ISO 15156-3.
The Inquiry
The inquiry asks if these materials fulfill the standard requirements of sour service, provided they have the same chemical and mechanical properties and heat treatment as their wrought or forged counterparts, and whether the same environmental limits apply for HIP materials as specified for the corresponding wrought alloys in the referred tables.
The Answer
The answer clarifies that the resistance of HIP materials to sour service must be demonstrated by material qualification testing in accordance with ISO 15156-3 Annex B.
Conclusion
This question pertains to NACE MR0175/ISO 15156-3 Tables A.23 and A.24, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2010-08.