Approved Heat Treatments for CA6NM and F6NM under NACE MR0175/ISO 15156-3

This page provides clarification on the approved heat treatments for CA6NM and F6NM under NACE MR0175/ISO 15156-3, as listed in Table A.18.

Are Other Heat Treatments Allowed?

The inquiry asks if other heat treatments are allowed as long as they do not exceed the original, and if a supplemental stress relieve is acceptable to lower the material hardness.

Only Approved Heat Treatments are Acceptable

The answer explains that only the heat treatments listed in Table A.18 are currently acceptable. Other heat treatments may be qualified in accordance with the requirements of NACE MR0175/ISO 15156-3 Annex B.

Reference

This question pertains to NACE MR0175/ISO 15156-3 A.6.2 Table A.18, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2006-19.