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NACE MR0175 and HIP materials used in valve components?

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Question:

PM HIP materials are used in valve components. The reason we are doing this is that casting quality of high alloy material has been poor and lead times long. The required casting repair process is very expensive as well. Our questions: 1. Do these PM HIP materials fulfill the standard requirements of sour service if they have the same chemical and mechanical properties and heat treatment as their wrought or forged counterparts? 2. Do the same environmental limits apply for PM HIP materials as specified for the corresponding wrought alloys in the referred tables? [Tables referred to are A.24, A.8, A.13 in Part 3.]

Answer:

HIP materials have been separately listed so far as in Tables A.24 and A.33. Their resistance to sour service must be demonstrated by material qualification testing in accordance with ISO 15156-3 Annex B.

This question is in relation to NACE MR0175/ISO 15156-3 Tables A.23 and A.24

Reference: ISO 15156 Maintenance Panel Inquiry #2010-08

 

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