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Overview
EN 10219 is a European standard that specifies the technical delivery conditions for cold-formed welded structural hollow sections (circular, square, or rectangular) made of non-alloy and fine-grain steels. The S275 grade is a common structural steel with a minimum yield strength of 275 MPa, suitable for welded, bolted, and riveted constructions.
Within EN 10219, two key variants of S275 steel are defined based on impact toughness at low temperatures:
- S275J0H – Moderate impact resistance (tested at 0°C).
- S275J2H – Higher impact resistance (tested at -20°C).
The suffix "H" denotes that the steel is supplied in a cold-formed hollow section.
S275J0H and S275J2H Steel Grades
S275J0H:
- Minimum Yield Strength: 275 MPa for thicknesses up to 16 mm, 265MPa for thicknesses range from 16 mm to 40mm.
- Impact Toughness: J0 indicates guaranteed impact performance at 0°C.
- Chemical Composition: It is a low-carbon steel with a maximum carbon content of 0.20%. Other elements include up to 1.50% Mn, 0.040% P, 0.040% S, and 0.009% N.
- Carbon Equivalent (CEV): The maximum CEV for nominal thicknesses up to 40 mm is 0.40%.
S275J2H:
- Minimum Yield Strength: Similar to S275J0H.
- Impact Toughness: J2 indicates guaranteed impact performance at -20°C.
- Chemical Composition: Similar to S275J0H, but with slightly different about element P and S (maximum content is 0.035%).
- Carbon Equivalent (CEV): The maximum CEV for nominal thicknesses up to 40 mm is 0.40%.
Mechanical Properties
Tensile Properties (EN 10219, Table 3)
| Property | S275J0H / S275J2H |
|---|---|
| Yield Strength (ReH) | ≥ 275 MPa |
| Tensile Strength (Rm) | 430–580 MPa(thickness＜3mm) |
| Elongation (A₅) | ≥ 22% (based on thickness) |
Impact Toughness (Charpy V-notch, transverse test)
| Grade | Test Temperature | Minimum Impact Energy |
|---|---|---|
| S275J0H | 0°C | ≥ 27 J |
| S275J2H | -20°C | ≥ 27 J |
Applications
S275J0H and S275J2H are widely used in structural applications requiring cold-formed hollow sections, such as:
Building frameworks (e.g., roofs, columns, trusses).
Bridges and infrastructure projects.
Offshore structures (where low-temperature toughness is critical).
Cranes and material-handling equipment.
- S275J0H: Suitable for general structural applications where impact resistance at 0°C is required.
- S275J2H: Ideal for applications requiring impact resistance at -20°C, such as in colder climates.
- Key Advantage of S275J2H: Superior toughness at sub-zero temperatures, making it ideal for harsh climates.
Manufacturing and Certification
These steel grades are typically produced as hollow sections, either welded or seamless.
- Welding: Compatible with common methods (e.g., MMA, MIG/MAG). Preheating may be required for thick sections.
- Cold Forming: Excellent ductility allows bending and shaping without cracking.
- Certification: Compliance with EN 10219 ensures that the steel meets the required mechanical and chemical properties for structural applications.
Conclusion
EN 10219 S275J0H and S275J2H offer a balance of strength, weldability, and cost-effectiveness for cold-formed steel structures. The choice between them depends on environmental conditions, with S275J2H being preferred for low-temperature applications.
For detailed tolerances or processing guidelines, refer to EN 10219 and supporting standards (e.g., EN 1993 for Eurocode design).
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