FAQ's

How to evaluate the microstructure of duplex stainless steels welding for NACE MR0175?

ISO 15156-3, A.7.3: Metallographic Examination of Materials

This page provides answers to inquiries related to ISO 15156-3, A.7.3, specifically on the classification and quantification of closely spaced spheroidal precipitates, and the suitable practices or standards for this quantification.

For NACE MR0175/ISO 15156-3, A.7.3, the equipment user and manufacturer are responsible for setting the quantitative standard they wish to follow when the guidance given is insufficient. They must also agree on the method and acceptance criteria for the measurement of precipitates.

This question pertains to NACE MR0175/ISO 15156-3 A.7.3, and the reference cited is ISO 15156 Maintenance Panel Inquiry #2005-28.

Moreover, this page highlights the design codes and standards that require exhaustive examination of the microstructure of duplex and superduplex stainless steels. For more information, check out our related article on duplex microstructure and let us assist you in navigating these requirements.

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