Technical Overview of the EN 10025:2004 Standard
The EN 10025:2004 standard establishes modern European requirements for hot-rolled structural steels. This regulatory framework systematizes chemical composition, mechanical characteristics, and delivery regulations, replacing the outdated EN 10025:1993 edition and its associated standards. Full documentation is available in English, French, and German.
Evolution of Standardization
The European Committee for Standardization (CEN) systematically consolidated disparate national standards into a unified EN 10025 system. In 2004, a major revision was conducted, aiming to bring all structural metal products into compliance with EU Directive 89/106/EEC. Today, the standard is divided into six parts covering all types of rolled products, from non-alloy to high-strength quenched steels.
EN 10025-1:2004 – General Technical Delivery Conditions
The first part defines general technical requirements for hot-rolled structural steels, excluding structural hollow sections. This section serves as the foundation for all subsequent parts, regulating quality control procedures and product acceptance rules.
EN 10025-2:2004 – Non-Alloy Structural Steels
This part covers technical delivery conditions for non-alloy flat and long products. The standard does not apply to hollow sections (regulated by the EN 10210/10219 series). The document establishes strict tolerances for chemical composition and mechanical properties, including impact strength for various temperature regimes. Products are supplied primarily in the +N (normalized rolling) condition.
| Steel Grade | EN Number | Previous Designation |
|---|---|---|
| S235JR | 1.0038 | S235JR / 1.0037; S235JRG1 / 1.0036; S235JRG2 / 1.0038 |
| S235J0 | 1.0114 | S235J0 |
| S235J2 | 1.0117 | S235J2G3 / 1.0116; S235J2G4 / 1.0117 |
| S275JR | 1.0044 | S275JR |
| S355JR | 1.0045 | S355JR |
| S355J2 | 1.0577 | S355J2G3 / 1.0570; S355J2G4 / 1.0577 |
Designation System of EN 10025-2
- S — structural steel;
- Number (e.g., 235) — minimum yield strength (Reh) in MPa;
- JR/J0/J2 — impact strength indicators at temperatures of +20°C, 0°C, and -20°C, respectively;
- K2 — impact strength of 40 J at -20°C;
- +AR/+N — delivery condition (as-rolled or normalized).
EN 10025-3:2004 – Normalized Fine-Grain Steels
A specialized standard for weldable fine-grain steels subjected to normalization. It is used in critical structures: bridge construction, pressure vessels, and hydraulic engineering structures.
EN 10025-4:2004 – Thermomechanically Rolled Fine-Grain Steels
Regulates the production of fine-grain steels processed via thermomechanical rolling (TMCP). This method provides a combination of high strength and excellent toughness, which is critical for dynamic loads.
EN 10025-5:2004 – Weather-Resistant Steels
The standard for steels with increased resistance to atmospheric corrosion. Due to alloying elements, a passivating protective layer forms on the metal surface. These are used in bridge construction and architectural metal structures where durability is required without regular painting.
EN 10025-6:2004+A1:2009 – High-Yield Strength Steels
Defines requirements for flat products in the quenched and tempered (Q&T) condition. It provides a minimum yield strength from 460 to 960 MPa, which allows for a significant reduction in the weight of metal structures while maintaining load-bearing capacity.
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