EN 10204 Certificate Types Explained: 2.1, 2.2, 3.1 and 3.2
Understand what each EN 10204 inspection document covers, when your project requires a 3.1 Mill Test Certificate, and how Steel Rebar Germany supplies the right documentation for every export shipment.
What Is EN 10204 and Why Does It Matter for Rebar Procurement?
EN 10204 is the European standard that defines the types of inspection documents issued by manufacturers for metallic products — including reinforcing steel bars, coils, and mesh. First published as a harmonised European standard, it replaced older national certificates and is now the universal reference for steel product documentation across the EU and in international B2B procurement.
For contractors, importers, and project buyers sourcing DIN 488 / EN 10080 compliant rebar, EN 10204 certificates are the primary proof that the supplied material meets the specified mechanical and chemical properties. Understanding which certificate type your project specification demands — and what each actually guarantees — prevents costly delays at customs, at the mill, or during structural audits.
EN 10204 defines four main document types, grouped into two categories: non-specific inspection (2.1 and 2.2) and specific inspection (3.1 and 3.2). The higher the number, the greater the level of independent verification and traceability.
Type 2.1 — Declaration of Conformance
A 2.1 document is a declaration by the manufacturer stating that the products supplied conform to the requirements of the purchase order. It contains no actual test data. The declaration is validated solely by the manufacturer’s authorised representative.
Use cases for 2.1 are limited in structural rebar supply. It is sometimes acceptable for low-grade auxiliary steel products, spacers, or tying wire, but is almost never sufficient for load-bearing reinforcing bars on engineered structures. If a supplier offers only a 2.1 on B500B bars, treat that as a red flag.
Type 2.2 — Test Report
A 2.2 document goes further: it includes actual test results based on non-specific inspection — meaning the data comes from tests carried out on the same type of product, but not necessarily on the specific heat or cast being supplied. The results are validated by the manufacturer’s authorised representative.
2.2 certificates are common for standard catalogue products where consistent production parameters make batch-level testing representative. For rebar, a 2.2 may satisfy some domestic or lower-risk procurement requirements, but international project specifications — particularly those requiring traceability back to the exact heat of steel — will typically demand a 3.1.
Type 3.1 — Inspection Certificate (Mill Test Certificate)
The 3.1 Inspection Certificate — widely known as a Mill Test Certificate (MTC) — is the standard document for structural reinforcing steel in international trade. It contains test results from the specific batch, cast, or heat being supplied, and is validated by the manufacturer’s authorised inspection representative, who is independent of the production department.
A compliant 3.1 MTC for B500B rebar will include:
- Heat/cast number and chemical composition (C, Mn, Si, P, S, N, Ceq)
- Mechanical test results: yield strength Re (≥500 MPa), tensile strength Rm, ratio k = Rm/Re (≥1.08 for B500B), and uniform elongation Agt (≥5.0%)
- Geometry verification: diameter, rib geometry, weight per metre
- Reference to the applicable standard (DIN 488 / EN 10080)
- Authorised signatory of the manufacturer’s inspection body
Steel Rebar Germany supplies 3.1 MTCs as standard for all B500B bar, coil, and mesh orders destined for structural use. The MTC travels with the shipment and can be provided digitally in advance for pre-shipment review.
Type 3.2 — Inspection Certificate (with Third-Party Verification)
A 3.2 certificate adds an additional layer: the test results are validated both by the manufacturer’s authorised inspection representative and by an independent third-party inspector or a representative designated by the buyer. This is the highest level of EN 10204 documentation.
3.2 is typically required for:
- Nuclear, offshore, or critical infrastructure projects
- Projects where the buyer’s engineer or an approved third-party inspector (e.g. SGS, Bureau Veritas, TÜV) must witness and co-sign testing
- Procurement contracts that specify “third-party inspection at origin”
If your project calls for 3.2, please specify this at the quotation stage so that inspection arrangements can be coordinated with your nominated third party before production.
EN 10204 Certificate Comparison Table
| Type | Content | Validated by | Traceability | Typical use |
|---|---|---|---|---|
| 2.1 | Declaration only — no test data | Manufacturer’s representative | None | Accessories, non-structural |
| 2.2 | Test results from non-specific inspection | Manufacturer’s representative | Product type only | Standard catalogue products |
| 3.1 | Test results from specific batch/heat | Manufacturer’s independent inspection rep | Heat/cast number | Structural rebar — standard export |
| 3.2 | Test results from specific batch/heat | Manufacturer’s rep + buyer’s/3rd-party rep | Heat/cast number + witness | Critical/nuclear/offshore; 3rd-party contracts |
How to Specify the Correct Certificate in Your Purchase Order
When issuing a purchase order or RFQ for reinforcing steel, always state the required EN 10204 certificate type explicitly. A common clause reads: “Material to be supplied with EN 10204:2004 Type 3.1 Inspection Certificate, specific to the supplied heat, showing full chemical and mechanical test results per DIN 488 / EN 10080.”
If your project specification references an older national standard (e.g. DIN 50049 or BS 5700), note that EN 10204 supersedes these. The certificate types map broadly as follows: old 2.1 ≈ EN 10204 2.2; old 3.1.A ≈ EN 10204 3.1; old 3.1.C ≈ EN 10204 3.2.
For full details on the standards governing the steel itself, see our Standards & Certification page, and for delivery and documentation logistics, see our Export & Delivery guide.
Frequently Asked Questions — EN 10204 Certificate Types
Is a 3.1 MTC mandatory for structural rebar on EU-funded projects?
Can I request the MTC before the shipment leaves Germany?
What is the difference between a 3.1 MTC and a Certificate of Origin?
Does the EN 10204 standard specify the format of the certificate?
What should I do if I receive a 3.1 MTC that doesn’t match my order?
Source German-standard rebar with full export documentation
Tell us your specification and destination port — we’ll respond with a detailed quotation including EN 10204 3.1 MTC, Certificate of Origin, and CE Declaration of Performance.