A mill test certificate is the document that connects the steel you received to the tests that were run on it. It is also the document most often treated as something it is not – a laboratory report, a conformity certificate, or a third party inspection. This page is about getting the right certificate on the order, checking it when the pipe arrives, and knowing when it is not enough.
What the certificate is, and what it is not
It is: the manufacturer’s record of the heat, the chemistry, the mechanical and impact results, the heat treatment condition and the dimensions, issued against the specification on the order and signed by the mill’s own inspection department (or an independent inspector, for the higher certificate type).
It is not: a laboratory report at an independent test house, unless the order says so; a conformity registration for a regulated end use; or a third party inspection report. Each of those is a different document, bought differently and issued by a different party, and treating one as another is how a shipment gets rejected at site rather than at the mill.
Getting the certificate you need: how to write the order
| What you need | What to write on the order | Who issues it |
|---|---|---|
| Standard mill certification | The standard and edition, and “mill test certificate to EN 10204 3.1” | The mill’s inspection department |
| Independent verification | “EN 10204 3.2”, naming who attends | An inspector independent of the mill and the buyer |
| Project-specific testing | The project specification, with the test items and acceptance criteria written out | The mill, witnessed as the specification requires |
| Traceability to the shipped pieces | “Heat numbers to be shown on the certificates and on the bundles” | The mill, with the marking done in production |
Two items are worth adding on almost every order. First, the edition of the standard – a certificate written against an earlier edition may not answer the project’s question. Second, the language and units the receiving site works in, because a certificate nobody on site can read is a certificate that will be questioned again.
What the certificate must show
- The material specification and edition, and the grade.
- Heat number, and heat treatment condition where the specification controls it.
- Chemistry results set against the specification limits – values, not “typical”.
- Tensile, yield and elongation results; impact results where the grade or project requires them, with the test temperature.
- Dimensions, quantity or piece count, so the certificate can be tied to the bundles.
- The issuing inspection department and its signature or stamp; for 3.2, the independent inspector’s identification.
When the mill certificate is not enough
Three cases come up again and again, and each has a different answer.
- The end use is regulated. A conformity or approval document is required in addition to the mill certificate; the certificate says what was tested, not that the product may be installed. See the Saudi compliance page for how that route runs in practice.
- The project requires independent verification. Then the order needs EN 10204 3.2 or a witnessed test, because the point of the requirement is that the mill’s own department is not the only signature. Our EN 10204 3.1 vs 3.2 page compares the two.
- The buyer needs a scope the mill does not test routinely. Notched impact at a project-specified temperature, hardness surveys for sour service, or a specific non-destructive test – all of these have to be on the order before the heat is rolled, because they cannot be added to a certificate afterwards.
The mismatches that cost money
- Heat numbers on the certificate that do not appear on the bundles. Traceability fails, and on a project with a quality file the material is quarantined until it is resolved.
- A certificate issued against a different edition. The receiving inspection rejects the documentation and the material waits.
- Chemistry reported as typical values rather than results against limits. The certificate does not answer the question the specification asks.
- Certificates issued after shipment and not matching the invoice. The file that goes to the bank or the customs broker is inconsistent, and the delay lands on the importer.
- A certificate for the grade, but not for the delivery condition ordered. Where the specification controls heat treatment or hardness, the certificate has to say so, not just name the grade.
Each of these is cheaper to prevent before production than to fix after it, which is why the certificate requirement belongs in the enquiry rather than in the follow-up email.
What to send us with the enquiry
- The material specification and edition, and the grade.
- The certificate type: EN 10204 3.1, or 3.2 with an independent inspector.
- Any project-specific test items, with acceptance criteria and the test temperature.
- Whether heat numbers have to be marked on the bundles and shown on the certificates.
- The language and units the receiving site needs.
- Quantity, sizes, and the destination, so the documents and the shipment are planned together.
Frequently asked questions
How do I get a mill test certificate?
Ask for it on the order, not after delivery: name the standard and edition, the certificate type (EN 10204 3.1 or 3.2), and any project-specific tests. The certificate is produced from the heat that the pipe came from, so a requirement added after the heat is rolled becomes a re-test or a new heat – both of which move the delivery date.
What is the difference between a mill test certificate and a material test certificate?
In practice the two names are used for the same document: the manufacturer’s certification of the material against the specification. What matters is not the name but the detail – the standard and edition, whether it is a 3.1 or a 3.2, and whether the tests it reports are the ones the project asks for.
Is a mill test certificate the same as a 3.1 certificate?
A mill test certificate issued by the manufacturer’s own inspection department, with that department independent of production, is what EN 10204 describes as a 3.1 certificate. A 3.2 certificate is issued by an inspector independent of both the manufacturer and the buyer, and it has to be arranged before the tests are run.
Where to go next
- EN 10204 3.1 vs 3.2 – the two certificate types compared.
- Third party inspection – the inspection nodes and who attends them.
- SASO and Saber for steel pipe – when conformity is required in addition to the certificate.
- How to order – where the certificate requirement sits in the order flow.
- Get a quote – send the specification and the certificate requirement.
Need the right certificate on the order? Send the specification and edition, the certificate type, any project-specific tests, and the language the receiving site needs. We confirm the test programme before the heat is rolled.
Request a quotation