1. Header Information (Identifying the Parties and the Product)
This section identifies the document, the supplier, and the specific order it relates to.
Certificate Type: Clearly stated as "EN 10204 Type 3.1" or "Inspection Certificate 3.1".
Certificate Number: A unique identification number.
Issue Date: Date the certificate was issued.
Supplier (Manufacturer) Information: Name and address of the steel mill or the authorized distributor issuing the certificate.
Purchase Order Number: The reference number from the customer's order.
Customer (Purchaser) Information: Name and address of the buying company.
Product Description: e.g., "Hot-rolled steel plate Q355NH", "Steel strip Q355NH", etc.
Quantity and Unit: e.g., "5 Plates", "12,000 kg".
2. Material Identification and Specification
This links the physical product to the certificate.
Steel Grade: Q355NH must be explicitly stated.
Material Standard: The European standard the material is supplied to: EN 10025-5 (The standard for hot-rolled structural steels, Part 5: Technical delivery conditions for structural steels with improved atmospheric corrosion resistance).
Dimensions: Thickness, width, length (or diameter for pipes/tubes).
Heat Number / Melt Number: The unique identifier for the batch of molten steel from which the product was made. This is the most critical link between the product and its test results.
Product Form: e.g., Plate, sheet, coil, section, bar.
Supplier's Item/Batch Number: The manufacturer's internal identification for the specific batch of finished product.
3. Chemical Composition (Cast Analysis)
The certificate must list the results of the chemical analysis performed on a sample taken during the melting process. The values must conform to the limits specified in EN 10025-5.
Key Elements to be Listed:
Carbon (C)
Silicon (Si)
Manganese (Mn)
Phosphorus (P)
Sulfur (S)
Copper (Cu) - Critical for weathering resistance
Chromium (Cr) - Critical for weathering resistance
Nickel (Ni)
Optional elements like Vanadium (V), Niobium (Nb), etc., if applicable.
The actual measured values for each element must be provided, not just a statement of conformity.
4. Mechanical Properties
Results of mechanical tests performed on samples from the finished product. Values must meet the requirements of EN 10025-5 for the specified thickness.
Yield Strength (ReH) - Measured in MPa (e.g., ≥355 MPa for thickness ≤16mm)
Tensile Strength (Rm) - Measured in MPa (e.g., 470 - 630 MPa)
Elongation (A) - Measured in % (e.g., ≥22% for thickness 3mm - 16mm)
Impact Energy (KV): This is crucial.
Test Temperature: Must be specified (e.g., -20°C or -40°C for NH grade).
Absorbed Energy Value: The actual Joule value from the Charpy V-notch test (e.g., ≥27J average at -20°C).
Orientation: The direction of the test sample (longitudinal or transverse).
5. Technical Delivery Conditions & Inspection
This section confirms the state of the product and what was checked.
Delivery Condition: e.g., hot-rolled (+N).
Statement of Conformity: A clear declaration that the material supplied complies with the requirements of EN 10025-5.
Reference to Test Reports: The certificate should reference the internal test reports from the mill's quality department that contain the raw test data.
Inspector's Stamp/Signature: The certificate must be signed by an authorized, independent inspector within the manufacturer's organization who is not directly responsible for production.
Date of Testing: When the tests were performed.