Why EN 1090 Matters for European Steel Buyers
If you are importing or specifying structural steel for a project inside the European Union, EN 1090 is not optional paperwork — it is the legal gateway. Since 1 July 2014, structural steel components permanently incorporated into construction works must carry CE marking under the Construction Products Regulation (EU) No 305/2011. No CE mark means no legal placement on the EU market, no matter how good the steel is. For buyers of structural hollow sections, structural pipe, plates and fabricated components, EN 1090 decides who can legally supply you, what documents must travel with the goods, and what happens if something goes wrong on site.
The regulation catches buyers out in two directions. First, a fabricator in the EU cannot simply buy cheap sections from a third country and weld them into a building: the constituent products themselves must be covered by a harmonised standard or a European Technical Assessment, and the factory that produced them must operate under a certified factory production control (FPC) system. Second, main contractors and insurers increasingly demand documented compliance far beyond the legal minimum, which means the paperwork chain — from the steel mill to the fabrication shop to the site — has to be unbroken. A shipment that arrives in Rotterdam without the right certificates can end up as expensive scrap.
What EN 1090 Actually Covers
EN 1090 is a family of three parts, and buyers should know which part governs what they purchase:
- EN 1090-1 — the harmonised standard for structural components and kits in steel and aluminium. This is the part that creates the CE marking obligation for components such as beams, columns, hollow sections used structurally, trusses, bracing and bolted or welded kits.
- EN 1090-2 — the technical requirements for the execution of steel structures. It governs fabrication: cutting, welding, bolting, surface preparation, tolerances, and inspection. This is the standard your fabricator works to, and the one that defines execution classes.
- EN 1090-3 — the equivalent technical requirements for aluminium structures.
For a buyer of steel pipe and hollow sections, the practical question is: is my product a “structural component” under EN 1090-1? A structural hollow section supplied as a construction product for permanent incorporation into a building or civil works falls squarely inside EN 1090-1. Pipe destined for pressure service, mechanical engineering or energy plants is governed by other regimes (PED, EN 13480, EN 10255 and so on) — but the moment that same tube is specified as a column, chord of a truss or piling element, EN 1090 applies.
Execution Classes: EXC1 to EXC4
The heart of EN 1090-2 is the execution class system. The execution class (EXC) sets the severity of fabrication requirements — weld inspection levels, permissible imperfections, fitting tolerances and personnel qualification. It is chosen during design based on the consequence and reliability of the structure, not on the steel grade. Four classes exist, EXC1 being the least onerous and EXC4 the most demanding:
| Execution class | Typical use | What it means in practice |
|---|---|---|
| EXC1 | Simple, low-consequence structures: agricultural buildings, walkways, low-occupancy structures up to limited height (S1 up to 15 m, CC1) | Basic visual weld inspection, lowest inspection quota, simplest tolerances |
| EXC2 | Common buildings and light structures: most multi-storey residential and commercial buildings (CC2) | Standard NDT sampling of welds, qualified welding coordinators, defined fit-up tolerances — the default for most construction |
| EXC3 | Medium-consequence or failure-critical structures: large-span roofs, bridges of moderate consequence, structures with high safety requirements | Increased NDT extent, stricter weld acceptance criteria (class B), tighter geometric tolerances |
| EXC4 | Extreme-consequence structures: major bridges, nuclear-adjacent structures, structures where failure is catastrophic | Special measures: full NDT on critical welds, weld class B+, detailed fatigue assessment, mandatory experienced welding coordination |
Two practical consequences follow. First, EXC must be stated in the tender and the order — if the buyer does not specify it, EN 1090-2 defaults to EXC2, which may or may not match what the designer intended. Second, the execution class drives cost: moving from EXC2 to EXC3 can raise fabrication cost by double-digit percentages because of extended NDT and rework risk. A supplier who quotes without asking the EXC has probably not understood the order.
CE Marking and the Declaration of Performance
CE marking under EN 1090-1 is not a sticker the exporter prints. It is the end point of a legal chain:
- Factory Production Control (FPC). The manufacturer must run a permanent, documented quality system covering incoming material control, production, testing and traceability. For most structural components, the FPC must be certified by a Notified Body (system 2+), and initial type testing of the product is witnessed as well.
- Welding personnel and coordination. The fabrication shop must employ qualified welders (EN ISO 9606-1), approved welding procedures (EN ISO 15614-1) and a welding coordinator qualified to EN ISO 14731, matched to the highest execution class claimed.
- Declaration of Performance (DoP). For each product type, the manufacturer draws up a DoP declaring the essential characteristics: steel grades, dimensions and tolerances, execution class, resistance to service conditions, and dangerous substances. The DoP has a unique reference number and is published by the manufacturer.
- CE mark on the product and paperwork. The CE symbol with the Notified Body number accompanies every delivery, together with the DoP reference — on the component itself, on the packing list or in the accompanying documentation.
A frequent failure mode with imports: the mill in the third country produces perfectly good steel to EN 10025 or ASTM, but nobody in the chain holds EN 1090-1 FPC certification. In that case the EU importer or fabricator becomes legally responsible for placing the product on the market, and most respectable EU fabricators will refuse the consignment because they cannot legally sign for what they did not manufacture. The buyer’s protection is to ask, before ordering, one simple question: “Can you supply with EN 1090-1 CE documentation and a DoP, and which Notified Body certifies your FPC?”
What This Means for Hollow Sections and Structural Pipe
For the tube and hollow-section part of the supply chain, three documents matter on every delivery:
| Document | Issued by | Confirms |
|---|---|---|
| EN 10204 3.1 material certificate | Steel mill (independent inspection dept.) | Chemistry, mechanical properties, heat and lot traceability of the parent steel |
| DoP + CE declaration | Component manufacturer (EN 1090-1) | Declared performance of the finished component, execution class, FPC system |
| Welding dossier | Fabricator | Weld procedures (EN ISO 15614-1), welder quals (EN ISO 9606-1), NDT reports per EXC |
Note the difference from pipeline work: oil and gas buyers live in the world of API 5L and EN 10204 3.2 certificates, where an independent third party countersigns. EN 1090 normally works on 3.1 certificates for the parent material plus the manufacturer’s own FPC audit trail. If your project specification demands 3.2 for structural members, say so in the RFQ — it is achievable, but it must be priced in.
Common Pitfalls When Importing Structural Steel into the EU
- Price quoted “EXC2-equivalent” without certification. A discount price from a mill with no EN 1090-1 FPC is not a price for the same product. If compliance fails at customs or on site, the saving evaporates.
- Confusing CE on the steel with CE on the component. Steel plates and sections carry their own harmonised-standard CE marks (e.g. EN 10025 for flat and long products). The fabricated component needs its own EN 1090-1 CE mark with a DoP — one does not substitute for the other.
- Missing welding credentials for the EXC claimed. A DoP declaring EXC3 is worthless if the fabricator’s welding coordinator is only qualified for EXC2 work. Ask for the EN ISO 14731 certificate scope.
- Traceability broken at the cutting shop. Heat numbers must survive cutting, drilling and galvanising. Insist on a traceability plan for any component that will be processed between mill and site.
- Assuming UK rules match the EU. Since Brexit, Great Britain runs UKCA / UKAS equivalents; Northern Ireland still follows CE. For projects spanning both, plan both document sets from day one.
How CREATEEL Supports EN 1090 Projects
CREATEEL supplies carbon steel structural hollow sections, welded pipe and fabricated components for European projects, and structures its export documentation around the EU compliance chain described above: parent material with EN 10204 3.1 certificates to EN 10025 / EN 10219 / EN 10210 grades, factory production control aligned with EN 1090-1 requirements, weld procedures and welder qualifications per EN ISO 15614-1 and EN ISO 9606-1, and full heat-to-piece traceability from mill certificate to packing list. For projects requiring special execution classes or third-party witnessing, we scope the NDT and documentation package at quotation stage, so the compliance cost is visible before the order is placed.
Typical deliverables on an EN 1090 project include: mill test certificates, the Declaration of Performance reference, weld procedure specification records, NDT reports proportioned to the execution class, and a packing list keyed to heat numbers. If you are unsure which execution class your design assumes, send us the structural drawing or the designer’s specification — we will confirm the class, quote accordingly, and flag anything in the specification that will raise fabrication cost before you commit.
Need structural hollow sections with proper EN 1090 documentation? CREATEEL exports welded and seamless structural steel to EU buyers with complete CE / DoP documentation chains. Get a quote.
