TECHNICAL LIBRARY · ISO ETCH SCREENING
ISO 4212:2023 — Oxalic-Acid Etch Test for Austenitic Stainless Steel
Procurement reference for evaluating non-sensitization of austenitic stainless steel using an oxalic-acid etch.
Edition control: ISO 4212:2023 is the published first edition, February 2023. Check the authorised text 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.
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Define the Corrosion-Test Route Before Quotation
Technical Sources & Revision
Source: ISO. ISO 4212:2023
Document / edition: ISO 4212:2023
Source used for: The public ISO catalogue record supports the document identity, publication status and scope summary on this page. It is used for the stated material or product coverage and the named classification, inspection or test method, where applicable. It does not establish numerical acceptance limits or certify a supplied product.
Technical source review:
Review scope: the public publisher record and this procurement summary, not a clause-by-clause audit of the full standard. Use the governing publication, purchase specification and product or test documentation for acceptance.