In NACE MR0175, is ductile iron ASTM A 536 acceptable for pressure-containing parts?

Question:

In NACE MR0175/ISO 15156 Part 2, Paragraph A.2.4, ductile iron ASTM A 536 is listed in Table A.5 as acceptable materials for drillable packer components for sour service. However, it is not mentioned in Paragraph A.2.4.1. Can we use this material for pressure-containing parts, i.e., valve stems?

Answer:

No, ductile iron ASTM A 536 is not listed in A.2.4.1 and may not be used for pressure-containing parts.

This question is in relation to NACE MR0175/ISO 15156-2 Annex A.2.4.1 and A.5

Reference: ISO 15156 Maintenance Panel Inquiry #2004-20

https://oilandgascorrosion.com/faqwd/mp2004-20/