Understanding NACE MR0175 Hardness Requirements for Round Bar Stock 304/316 SS Material

Introduction

This page features a Q&A section that addresses the NACE MR0175 hardness requirement for round bar stock 304/316 SS material, and whether the Rockwell C 22 max hardness refers to the hardness anywhere on the raw material or at mid-radius, where ASTM standards require the hardness measurement to be taken.

The Answer

The answer provided clarifies that the Maintenance Panel cannot comment on the hardness test locations specified in ASTM standards. When used for sour service, 304/316 SS materials must comply with all the requirements of NACE MR0175/ISO 15156-3, Table A.2. The standard does not define the hardness testing location, but the hardness requirements must be met regardless of the selected test location.

Conclusion

This question pertains to NACE MR0175/ISO 15156-3 Table A.2, and the reference provided is ISO 15156 Maintenance Panel Inquiry #2006-05.

Assistance with NACE MR0175 Compliance

OGC Energy offers assistance to clients in meeting NACE MR0175 requirements, including hardness values and testing locations.