22HRC for NACE MR0175? is it before or after shaping, forming, cold reducing, expansion?


As per Technical Circular 3 of ISO 15156 Part 3, Table A.2, parent material selected for our site condition complies with note (a) of table A.2. This parent material will comply with requirement of maximum 22HRC. It is not mentioned in note (a) if this maximum hardness requirement should be verified before or after shaping, forming, cold reducing, tension, expansion, etc… Could you please clarify?


Hardness requirement of maximum 22 HRC shall be verified after cold working. Note that cold working intended to enhance the mechanical properties is prohibited.

This question is in relation to NACE MR0175/ISO 15156-3 Table A.2

Reference: ISO 15156 Maintenance Panel Inquiry #2014-11

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