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3.1 Steel Certificate according to EN 10204 – Heat Traceability and Quality Control
Modern construction requires full quality control of steel products at every stage of an investment. Therefore, a 3.1 steel certificate (officially: Type 3.1 inspection certificate according to EN 10204) is the fundamental document confirming the technical parameters of the material. Furthermore, engineers and investors expect absolute certainty before incorporating structural shapes into a build. As a result, the proper verification of this certificate directly determines the safety of the entire structure.
A 3.1 steel certificate is an official control document that confirms the compliance of steel mill products with the order and industry standards (e.g., EN 10025-2). An authorized quality control representative – operating independently of the manufacturing department – issues this document based on actual chemical and mechanical testing. Thanks to this, the customer receives precise heat analysis results as well as parameters for yield strength Re, tensile strength Rm, and impact energy KV. What is more, the entire process relies on strict traceability, linking a unique heat number directly to the physical marking on the profiles.
What is a 3.1 Steel Certificate According to EN 10204?
The European standard EN 10204 classifies inspection documents and divides them into two main categories: declarations based on non-specific inspection and certificates based on specific testing. First and foremost, understanding these distinctions is essential for structural compliance.
| Document Type | Name acc. to EN 10204 | Inspection Characteristics | Authorized Issuer |
|---|---|---|---|
| Type 2.1 | Declaration of compliance with the order | Non-specific – confirmation of compliance without test results | Manufacturer |
| Type 2.2 | Test report | Non-specific – test results from routine quality control | Manufacturer |
| Type 3.1 | 3.1 Steel Certificate (Inspection certificate) | Specific – actual test results from the delivered heat | Manufacturer’s independent quality control representative |
| Type 3.2 | Inspection certificate 3.2 | Specific – test results independently validated | Manufacturer’s authorized inspector & external inspector |
Consequently, the main difference between a 2.2 test report and a 3.1 steel certificate lies in how the testing is conducted. For this reason, for a 3.1 document, the laboratory takes destructive test samples directly from the specific production batch assigned to a particular heat number.
What Exactly Does a 3.1 Steel Certificate for Mill Products Contain?
The Quality Control Department prepares the document based on comprehensive laboratory testing. Thus, the complete range forming WOST S.A.’s steel product portfolio undergoes rigorous inspection procedures. As a result, the 3.1 steel certificate provides precise technical data across two key areas:
1. Chemical Composition Analysis
The document specifies the exact content of individual elements in the steel. In this regard, quality controllers verify the following key indicators:
- Carbon (C), manganese (Mn), and silicon (Si) content: as these elements shape mechanical strength and hardness.
- Sulfur (S) and phosphorus (P) content: as these impurities reduce steel ductility (limit values are typically kept below 0.025%).
- Carbon equivalent value (CEV): as this indicator determines the weldability of the material.
2. Mechanical Property Testing
Furthermore, specialists perform destructive testing on cut material samples. Thanks to this, the certificate includes:
- Upper yield strength (Re or Rp0.2): which determines structural load-bearing capacity in engineering calculations.
- Tensile strength (Rm): which defines ultimate breaking stress.
- Percentage elongation (A5): which confirms the ductility of the alloy (typically exceeding 20%).
- Impact energy (KV): which verifies resistance to brittle fracture at specified temperatures (for J2 grades, e.g., S355J2, the required minimum is 27 J at -20°C).
As a result, engineers can easily match these findings with specific profiles in our product range, such as equal angles, unequal angles, UPN channels, and hot-rolled T-bars.
Heat Traceability and Factory Production Control
Consistency between documentation and physical material on-site requires full transparency. Therefore, a 3.1 steel certificate establishes a solid legal and technical foundation for both contractor and investor.
Consequently, the quality control system rests on three pillars:
- Durable marking: The rolling mill stamps or tags every profile or bundle with the heat number and CE mark.
- Digital footprint: The ERP system immediately connects laboratory test results with the specific batch.
- FPC Certification: Notified bodies regularly audit Factory Production Control (FPC).
What is more, we apply these same strict standards when manufacturing hot-rolled special profiles.
How to Verify a 3.1 Steel Certificate During Project Inspection?
The site inspector always checks the weight and geometric dimensions of the delivered steel. However, the project manager must carefully cross-reference the certificate data with the structural design specifications.
Therefore, it is worth using free engineering tools to streamline your calculations:
- A quick conversion from length to weight is available on our online steel weight calculator.
- Complete dimensional tolerances and section properties can be found in the WOST S.A. product catalog.
Summary and Technical Support
In summary, a correctly issued 3.1 steel certificate provides full assurance of structural safety in accordance with EN 1993 (Eurocode 3). Thus, the absence of the required documentation can lead building inspection authorities to halt project handover.
If you need technical assistance or are looking for archived documentation, feel free to contact the WOST S.A. Quality Control Department.