Why is Age-Hardening Required in NACE MR0175 / ISO 15156 for UNS R30003?

The Background

This page provides an answer to a question concerning the specific demand for age-hardening in NACE MR0175 / ISO 15156, Part 3 for UNS R30003, despite age-hardening typically increasing the material’s hardness. The inquiry seeks to understand whether this is due to reported problems when the material is not age-hardened, limited data availability for non-age-hardened material, or some other reason.

The Answer

The answer states that Table A.39 of NACE MR0175/ISO 15156-3 originally balloted and accepted only the “”cold worked + age hardened”” condition of UNS R30003. No specific reason is given for this requirement.

Further Information

This question pertains to NACE MR0175/ISO 15156-3 Table A.39, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2009-05. Those who require assistance or further information on this topic, including the latest revision of UNS R30003 NACE MR0175, can contact the team for guidance.