Your supplier sends a cert stamped "EN 10204 3.1." Your incoming inspection approves it. The shipment goes to the European customer. Then the customer's receiving inspector rejects it — because the authorized inspector's signature is absent, or the inspector's name isn't traceable to a named authorized person at the mill. The cert was technically a 3.1. It wasn't a compliant 3.1.
This is not a rare edge case. It's one of the most common cert rejection scenarios in European supply chains. The difference between a cert that passes and one that fails has nothing to do with the material. It has everything to do with five specific fields.
What a Compliant EN 10204 3.1 Cert Must Contain
EN 10204 Type 3.1 is a specific inspection document issued by the manufacturer's authorized inspector. "Specific" is the operative word — the cert must be tied to the exact heat that was shipped, not a representative heat.
A compliant 3.1 cert requires:
- The specific heat number and material identification — not a generic product cert
- Test results from that specific heat — not a representative heat or average values
- The name and position of the authorized inspector at the mill — not just a stamp, not just a signature
- A declaration that results conform to the order requirements — the cert must state compliance, not just list values
- Reference to the applicable standard and the specific order — the customer's PO or contract number must appear
Every one of these is required. A cert missing any of them is non-conforming under EN 10204, regardless of how professional it looks.
What an EN 10204 3.2 Cert Must Additionally Contain
EN 10204 Type 3.2 adds a third-party layer. The third-party inspector must be identified — not merely implied.
A compliant 3.2 cert adds:
- The third-party inspector's name, organization (Lloyd's Register, Bureau Veritas, TÜV, SGS, etc.), and stamp — all three must be present
- Evidence that the third party witnessed or verified the testing — a countersignature without an attestation of presence does not satisfy 3.2
- The inspector's qualification or accreditation reference — particularly relevant for nuclear, offshore, and defense applications
The distinction between "countersigned" and "witnessed" trips up many fabricators. A mill cert that has two signatures is not automatically a 3.2. The third-party inspector must attest to independent verification.
The Four Fields European Auditors Check First
European customer auditors — whether at goods receipt or at a formal supplier audit — follow a consistent review sequence. They look at the same fields in the same order:
1. Inspector name (not just a stamp). An ink stamp without a printed or handwritten name does not satisfy the authorized inspector requirement. The name must be legible and attributable to a specific individual at the mill.
2. The phrase "specific inspection" in the declaration. The cert must state that the testing was performed on the specific heat identified, not on a representative basis. Some mills use templated language that omits this. Auditors notice.
3. Heat number match. The heat number on the cert must match the heat number on the delivery documentation — the packing list, the material tags, and the purchase order reference. A one-digit discrepancy triggers an immediate hold.
4. Order reference. The cert must reference the specific customer PO or contract number. A generic cert covering "standard production" does not satisfy EN 10204 for a specific shipment.
What "Looks Valid" Actually Means
A cert with a professional layout, the right header, and a mill stamp can look like a compliant 3.1 and still be missing the authorized inspector name. This is the most common gap in incoming inspection.
Professional appearance is not evidence of compliance. Mills that supply to multiple markets — some with rigorous cert requirements, some without — often produce certs that meet the less demanding market's standards. The cert arrives looking complete. It isn't.
The gap between "looks valid" and "is valid" is exactly what European auditors are trained to find. They are not examining the material. They are examining the document.
Building a Cert Acceptance Checklist
The fix is not more careful reading — it's a structured checklist applied at incoming inspection. A checklist that explicitly requires:
- Heat number present and confirmed against delivery documents
- Authorized inspector name (not just stamp) present and legible
- Declaration of conformance to order requirements stated explicitly
- Specific order or PO reference present on the document
- For 3.2: third-party organization named, inspector identified, attestation of witness or verification
This is not a long checklist. It takes two minutes per cert. It catches the exact failures that European auditors catch during audits — before the material leaves your facility.
Do not rely on "it says EN 10204 3.1 in the header" as an acceptance criterion. That field is filled in by the issuing mill. It does not verify compliance.