H-beam (EN Standard)
EN 10025 is a comprehensive European standard that establishes the technical delivery conditions for hot-rolled structural steel products. Organized into six parts, the standard covers a diverse range of structural steel types — from non-alloy and fine-grain grades to weathering and quenched-and-tempered steels — each engineered to deliver specific combinations of yield strength, toughness, weldability, and corrosion resistance. By enforcing consistent quality and performance criteria across Europe, EN 10025 facilitates international trade and provides a reliable foundation for engineering design. These steels are extensively applied in building construction, bridges, offshore structures, and heavy machinery, where their excellent formability, weldability, and mechanical strength make them a preferred material choice across a broad spectrum of structural applications.
| Standard Part | Steel Category | Main Manufacturing Process | Typical Grade Examples | Weldability / Toughness Advantages |
|---|---|---|---|---|
| EN 10025-2 | Non-alloy structural steel | Conventional hot-rolled (AR) | S235JR, S275JR/J0, S355JR/J0/J2/K2, S460J0 | Cost-effective; suitable for general ambient and mild-cold structural applications |
| EN 10025-3 | Fine-grain structural steel | Normalized / Normalized rolling (N/NL) | S275N/NL, S355N/NL | Refined grain structure; excellent low-temperature toughness |
| EN 10025-4 | Fine-grain structural steel | Thermomechanically rolled (M/ML) | S275M/ML、S355M/ML、S420M/ML、S460M/ML | Superior weldability, lower carbon equivalent, best overall performance |