The cert passed your internal QA review. Your quality engineer signed off on it. The shipment left your dock with what looked like complete documentation — heat numbers, chemical analysis, mechanical properties, the works. Then the European customer's receiving team flagged it on arrival. The purchase order specified EN 10204 Type 3.2. The cert you shipped was Type 3.1. Your material never made it to the production floor. It sat in a bonded warehouse while both sides argued over who missed what.

This happens more than anyone admits. The cert looked valid because it was valid — just not the right type. One field in the document header, one line in the purchase order specification that nobody verified at order entry, and a shipment worth tens of thousands of dollars is on hold.

What EN 10204 Is and Why It Exists

EN 10204:2004 is the European standard that governs inspection documents for metallic products. It defines what type of certificate is required depending on the level of verification your customer needs — and it is not optional when your contract references it.

The standard replaced DIN 50049 in 1995 and has been the operative version since the 2004 revision. If your European customer works with CE-marked structural steel, pressure equipment under the Pressure Equipment Directive (PED), offshore or subsea applications, or any project governed by Eurocodes, they are almost certainly working to EN 10204:2004.

The gap that catches North American suppliers: your ASTM or ASME mill test report is not an EN 10204 document. It may contain identical data — chemistry, tensile, yield, Charpy values — but it does not follow the declaration structure EN 10204 requires. European auditors do not treat them as equivalent, and neither do most EU customer contracts.

The Four EN 10204 Document Types

This is where the standard earns its reputation for being misunderstood. There are four document types, and they are not interchangeable.

Type	Name	Who Verifies	Test Specificity	Typical Application
2.1	Declaration of Compliance	Supplier only	Non-specific — no test results	Low-risk structural, general commodity
2.2	Test Report	Manufacturer	Non-specific — results from any heat	General fabrication, moderate traceability requirements
3.1	Inspection Certificate	Manufacturer's authorized inspector	Specific — results from the supplied heat	Pressure vessels, EN 1090 structural, PED components
3.2	Inspection Certificate	Manufacturer's inspector + independent third party	Specific — results from the supplied heat	Offshore, nuclear, defense, high-criticality aerospace

Type 2.1 — Declaration of Compliance

The supplier declares in writing that the product meets the order requirements. No test results are attached. This is the lowest-level EN 10204 document and is appropriate only when the customer's risk tolerance allows for supplier self-declaration without data. You will rarely see this specified for anything beyond commodity structural shapes going into non-critical applications.

Type 2.2 — Test Report

A test report includes actual test results, but those results do not have to come from the specific heat that was supplied. The manufacturer can draw from representative testing of similar product. This matters: if traceability to a specific heat is critical for your customer's QMS or weld procedure qualification, Type 2.2 does not deliver it.

Type 3.1 — Inspection Certificate (Manufacturer Verified)

Type 3.1 is the workhorse of the EN 10204 world. Test results are specific to the heat supplied. The manufacturer's own authorized inspector — not just a QA signatory, but someone explicitly designated under the standard — validates and signs the document. The inspector's name must appear on the certificate.

Most structural, pressure vessel, and PED applications stop here. If your customer's purchase order says "EN 10204 3.1" without further qualification, this is what they expect to receive.

Type 3.2 — Inspection Certificate (Third-Party Verified)

Type 3.2 carries all the requirements of 3.1 and adds independent third-party verification. A recognized inspection body — Lloyd's Register, Bureau Veritas, TÜV Rheinland, DNV, or similar — witnesses or validates the inspection and countersigns the certificate. Their name, organization, and stamp must be present on the document.

This is the required level for offshore class projects governed by DNV or Lloyd's rules, nuclear applications under RCC-M or ASME Section III, most defense procurement, and any contract that explicitly requires an independent witness. If you are not sure whether your application requires 3.2, read the contract. If the contract references an independent inspection body, the answer is 3.2.

Where North American Shops Get It Wrong

The most common failure is conflating an ASTM mill cert with EN 10204 3.1. An ASTM A276 cert for stainless bar and an EN 10204 3.1 cert for the same material are not the same document. The ASTM cert does not carry the declaration structure, the authorized inspector designation, or the EN 10204 header that European auditors check first. Submitting an ASTM cert in place of an EN 10204 cert will get it rejected.

The second failure is ordering 3.1 and receiving 2.2 without catching the difference at incoming inspection. This happens when receiving teams verify that a cert was received — not what type it is. A Type 2.2 cert and a Type 3.1 cert can look identical at a glance. The difference is in the document header and, critically, in whether the test data is specific to the heat you received.

The third failure is confusing "certified" with "third-party inspected." Type 3.1 is manufacturer self-certified. The manufacturer's own authorized inspector signs it. There is no external body involved. If your customer needs an independent witness, they need 3.2, and you need to specify that at order placement — not at shipment.

The fourth failure is the most preventable: not specifying the required type in the purchase order. Suppliers will ship the level they produce by default. If you do not ask for 3.2, you will receive 3.1. If you do not specify 3.1, you may receive 2.2. The purchase order is where this gets fixed — not at incoming inspection.

When Each Type Is Contractually Required

Type 2.2 is appropriate for low-risk structural fabrication, general commodity applications, and situations where the customer needs a paper trail but does not require heat-specific traceability. It shows up in general construction, HVAC, and non-critical assemblies where a downstream audit is unlikely.

Type 3.1 is required for most pressure vessel fabrication, EN 1090 structural steel execution class EXC2 and above, PED-compliant components (equipment categories I through IV depending on risk), and any Eurocodes project where the specifying engineer has referenced EN 10204. It is also the minimum for most ASTM A6/A568 equivalents when the end market is Europe.

Type 3.2 is non-negotiable for offshore platforms and subsea equipment certified under DNV-ST or Lloyd's rules, nuclear components under RCC-M or ASME Section III N-stamps with European delivery, defense procurement under AQAP 2110 or equivalent, and aerospace structural components where a design authority has specified an independent witness. Any contract that names a specific third-party inspection body in the quality plan is a 3.2 requirement.

Reading the contract: EN 10204 type requirements appear in purchase order quality clauses, project quality plans (PQPs), inspection and test plans (ITPs), or material specifications embedded in the contract package. Search for "EN 10204," "3.1," "3.2," "inspection certificate," or the name of an inspection body. If you find a named third party — even just "as approved by [body]" — treat it as a 3.2 requirement until confirmed otherwise.

EN 10204 in Context with Other Standards

ASME Section II and EN 10204: ASME requires certified material test reports (CMTRs) for code-stamped pressure vessels. When that vessel is being built by a North American shop for delivery to a European site, EN 10204 3.1 or 3.2 is typically required in addition to the CMTR — not instead of it. Both documents must be present. The CMTR satisfies the ASME code requirement; the EN 10204 cert satisfies the European customer's contractual requirement.

API 5L and EN 10204: Pipeline projects frequently specify both. API 5L covers the pipe manufacturing specification and its own PSL 1/PSL 2 test requirements. EN 10204 3.1 or 3.2 defines who validates those test results and how. You will see dual-certified pipe on most cross-border pipeline projects — the API 5L designation appears on the pipe body marking, the EN 10204 cert accompanies the shipment documentation.

ISO 17025 and EN 10204: These are not equivalent and not interchangeable. ISO 17025 is the accreditation standard for testing laboratories — it establishes that the lab running your mechanical or chemical tests is competent and calibrated. EN 10204 governs the inspection document itself. A test run by an ISO 17025-accredited lab does not automatically produce an EN 10204 3.2 certificate. You still need the inspection structure, the designated inspector, and — for 3.2 — the independent third-party countersignature.

NACE and EN 10204: Corrosion-resistant applications frequently reference both. NACE MR0175/ISO 15156 for H₂S service specifies material requirements but defers to EN 10204 for documentation. If your material is going into sour service in a European or North Sea application, expect EN 10204 3.1 at minimum, 3.2 if the project class requires it.

Practical Checklist for Getting EN 10204 Right

Getting this right is not complicated. It requires discipline at a few specific control points.

At order entry:

Identify the required EN 10204 type from the customer's purchase order, ITP, or project quality plan before placing the mill order
Specify the type explicitly in your purchase order to the mill or service center — "EN 10204 3.1" or "EN 10204 3.2," not just "mill cert required"
If 3.2 is required, confirm the accepted inspection body with your customer before the mill schedules the heat — not all mills have standing arrangements with all bodies

At incoming inspection:

Verify the document type header — not just that a cert was received
For 3.1: confirm the authorized inspector's name is present and legible
For 3.2: confirm the third-party inspector's name, organization, and stamp are all present — a missing stamp is a non-conforming document
Match heat numbers on the cert to heat numbers on the material markings

In document control:

Archive original EN 10204 certs — photocopies and scans sometimes lose inspector stamps, which are required for 3.2 verification
Link the cert to the specific purchase order and job number in your document management system
Retain certs for the retention period your customer requires — for pressure and offshore applications, ten years is common; some nuclear contracts require indefinite retention

Segment-Specific Considerations

Manufacturers producing pressure vessels, heat exchangers, or structural fabrications for European end users need to build EN 10204 requirements into their material specifications and purchasing procedures. The right cert type should be determined during contract review, not at final document submission.

Fabricators working to EN 1090 execution class or PED category requirements will find that EN 10204 3.1 is the baseline, not the exception. Incoming inspection procedures need to explicitly check document type — receiving a 2.2 when you needed a 3.1 is a non-conformance that will appear in your next third-party audit.

Distributors who stock product and supply to projects with varying cert requirements need to understand that re-issuing a cert is not permitted under EN 10204. The cert stays with the heat. If a customer needs 3.2 and your stock carries 3.1 certs, you cannot upgrade them — you need to source new material with the correct cert.

Service centers that cut, process, or kitted material for European projects need to preserve the original cert through the supply chain. Processing does not change the EN 10204 type. Ensure your job travelers and documentation packets carry the original cert, not a transcription.

The EN 10204 Compliance Trap Most Shops Walk Into Uninformed