Austenitic stainless steels; Determination of resistance to intergranular corrosion; Part II : Corrosion test in a sulphuric acid/copper sulphate medium in the presence of copper turnings (Monypenny Strauss test)

This technical document specifies a laboratory procedure designed to evaluate the susceptibility of austenitic stainless steels to intergranular corrosion. The method focuses on a specific testing environment involving a sulfuric acid solution enriched with copper shavings, creating a sulfuric acid-copper sulfate medium. This particular approach, commonly known as the Monypenny Strauss test, is one of the established techniques for assessing the integrity of the steel's microstructure following welding or heat treatment processes. By exposing the material to these controlled chemical conditions, the standard outlines the necessary steps for preparing test specimens, conducting the immersion, and interpreting the resulting corrosion patterns. The protocol ensures that the testing conditions remain consistent, allowing for reliable comparisons between different grades of stainless steel regarding their resistance to grain boundary attack. It serves as a reference for manufacturers and quality control laboratories aiming to verify material performance in environments prone to intergranular degradation, providing a clear methodology for determining whether the steel meets required durability specifications without assessing its overall importance or mentioning the originating organization.