Metallographic determination of ferrite in an austenitic matrix of stainless steel

This technical specification outlines the metallographic procedures for determining the volume fraction of ferrite within the microstructure of austenitic matrix stainless steels. It provides a standardized methodology for the preparation, etching, and examination of metallographic specimens to ensure accurate quantification of ferrite content. The document details the criteria for image analysis, including the selection of magnification and the statistical treatment of results to minimize measurement variability. By establishing consistent testing protocols, this document facilitates comparative analysis of material composition across different production batches and processing conditions. The approach described relies on established principles of metallography and digital image processing techniques. It serves as a reference for laboratories and manufacturers requiring precise assessment of phase distribution in corrosion-resistant alloys. The guidance offered herein supports quality control processes and material characterization activities without prescribing specific equipment brands or manufacturing tolerances.