22HRC for NACE MR0175? is it before or after shaping, forming, cold reducing, expansion?
Verification of Maximum Hardness Requirement for Parent Materials in ISO 15156 Part 3, Table A.2
Introduction
This page provides an answer to a common question regarding the verification of the maximum hardness requirement of parent materials selected for site conditions as per Technical Circular 3 of ISO 15156 Part 3, Table A.2. The selected parent material complies with note (a) of table A.2, which requires a maximum hardness of 22 HRC.
Question
The note in Table A.2 of NACE MR0175/ISO 15156-3 does not specify whether the maximum hardness requirement should be verified before or after shaping, forming, cold reducing, tension, expansion, and others. What is the correct procedure for verifying the maximum hardness requirement?
Answer
The maximum hardness requirement of 22 HRC should be verified after cold working. It is important to note that cold working intended to enhance the mechanical properties is not allowed.
Conclusion
This answer pertains to NACE MR0175/ISO 15156-3 Table A.2, and the reference provided is ISO 15156 Maintenance Panel Inquiry #2014-11.