TECHNICAL LIBRARY · ISO ETCH SCREENING
ISO 4212:2023 — Oxalic-Acid Etch Test for Austenitic Stainless Steel
Procurement reference for oxalic-acid etching used to evaluate sensitization to intergranular corrosion in austenitic stainless steel.
Edition control: ISO 4212:2023 is the published first edition identified in the official ISO record checked on 31 August 2026. Confirm the authorised publication and order requirements before use.
Scope in Procurement
ISO 4212:2023 specifies an oxalic-acid etch method for evaluating non-sensitization of austenitic stainless steel by microscopic observation after electrolytic etching.
RFQ and Test Controls
- Applicable austenitic stainless grade and product condition
- Purpose of the etch test within the inspection plan
- Sample location, orientation and heat or lot identity
- Surface preparation and etching controls from the authorised standard
- Microscopic examination and classification requirements
- Acceptance or follow-up testing defined by governing documents
- Traceability of images and report to the delivered product
The inquiry and purchase order should link the test result to the exact material, product condition, sample identity and governing acceptance requirement.
Scope Boundary
ISO 4212 is an etch-evaluation method, not a universal corrosion-qualification or service-life test. The product standard or project specification must define its use and acceptance route.
Related MNK Technical Pages
Official Publication and Access Policy
Check the official record for ISO 4212:2023. Protected procedures, solution recipes, specimen drawings and acceptance tables are not reproduced on this website.
MNK-G.S.A | Industrial Procurement & Sourcing | mnkmetals.com | sales@mnkmetals.com