Question: Do NACE MR0175/ISO 15156-2, 7.3.2 “Parent metals” and NACE MR0175/ISO 15156-3, 6.2.1 “Hardness of parent metals” apply to machined forgings or are they meant to be applied to weldment parent metals only?

Answer:

The requirements listed in NACE MR0175/ISO 15156-2 Section 7.3.2 apply to the parent materials applicable to part 2; carbon and low alloy steels and cast irons. The parent materials include forgings. See also sections A.2.1.2 and A.2.1.3 of Annex A for additional requirements. The requirements listed in NACE MR0175/ISO 15156-3 Section 6.2.1 apply to parent materials applicable to part 2; CRAs and other alloys. The parent materials include forgings

This question is in relation to NACE MR0175/ISO 15156-3 Clause 6.2.1

Reference: ISO 15156 Maintenance Panel Inquiry #2014-03