3.1 Inspection certificate 3.1
Inspection certificate 3.1 · Inspección y ensayos · ISO 1101 + ASME Y14.5
Example in plan
How to interpret it
On the drawing, “Inspection certificate 3.1 per EN 10204 for steel 1.4404” states a inspection certificate 3.1 requirement.
What controls
Inspection document issued by the manufacturer itself, validated by a manufacturer's representative independent of production, declaring test results obtained on the product supplied and confirming that it complies with the order. It is a documentation requirement: it demonstrates material traceability and properties (chemical composition, mechanical properties, heat treatment) but does not replace dimensional verification of the part.
How to verify
Verification is a document review: check heat number, material designation, chemical composition, mechanical properties and declared treatments against the purchase order and drawing requirements. When there is reasonable doubt about the material's identity, it is checked by spectrometric analysis (PMI) or a hardness test on a sample, which is what makes it possible to detect a material mix-up. The documents received are filed with the lot record.
Common mistakes when interpreting it
- Confusing an inspection certificate with a generic declaration of compliance: they do not have the same scope or the same validation.
- Accepting the certificate without checking that the heat number matches that of the physical material.
- Losing traceability when cutting up the bar or plate, so the certificate can no longer be linked to the parts.
How to get it in the workshop / if it comes out of tolerance
The first thing to check on receiving material is that the certificate really corresponds to what has arrived: the heat number marked on the bar or plate must appear on the document. Maintain traceability when cutting: if several parts come from one bar, you must be able to say afterwards which heat each one came from. Without that link, the certificate loses much of its value.
If the heat number on the certificate does not match the one marked on the material, do not use it until it has been clarified with the supplier. If a property required by the order is missing, request the complete certificate before machining. If the material behaves abnormally during machining (unexpected hardness, different chips), a quick spectrometric check resolves the doubt far sooner than an argument.
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