ISO 13680 and NACE: Understanding the Differences in Maximum Hardness Values

The inquiry concerns NACE MR0175/ISO 15156 Table A.14, which specifies that “The maximum hardness value for these alloys in these applications shall be 40 HRC.” However, ISO 13680 Table C.27 indicates a Mean Hardness Number of 33 or 35 HRC, depending on the grade (Category 3). This significant difference in values raises questions and seeks clarification.

The Answer: NACE MR0175/ISO 15156

The MP can only answer questions related to NACE MR0175/ISO 15156 standard. The maximum hardness values in Table A.14 correspond to the maximum hardness values of the tested materials. The MP cannot comment on hardness values from other ISO standards such as ISO 13680.

This inquiry pertains to NACE MR0175/ISO 15156-3 A.14. If you require assistance in resolving inquiries related to nickel alloys, please do not hesitate to contact us.