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Overview
EN 10210 is a European standard that specifies the technical delivery requirements for hot-finished structural hollow sections (circular, square, rectangular, or elliptical) made of non-alloy and fine-grain steels. The S275 grade is a common structural steel with a minimum yield strength of 275 MPa. Two key variants under this standard are:
- S275J0H – Impact tested at 0°C.
- S275J2H – Impact tested at -20°C.
These grades are widely used in construction, bridges, and other load-bearing structures due to their good weldability, strength, and toughness.
Chemical Composition (Nominal Values, % by Weight)
The chemical composition of S275J0H and S275J2H must comply with EN 10210-1. Key elements include:
| Element | S275J0H (Max %) | S275J2H (Max %) |
|---|---|---|
| C | ≤ 0.20 | ≤ 0.20 |
| Si | - | - |
| Mn | ≤ 1.50 | ≤ 1.50 |
| P | ≤ 0.035 | ≤ 0.035 |
| S | ≤ 0.030 | ≤ 0.030 |
Note: S275J2H has stricter limits on P and S for improved toughness at low temperatures.
Mechanical Properties
The mechanical properties (EN 10210-2) for hot-finished hollow sections are:
| Property | S275J0H | S275J2H |
|---|---|---|
| Yield Strength (ReH, MPa) | ≥ 275 | ≥ 275 |
| Tensile Strength (Rm, MPa) | 410–560 | 410–560 |
| Elongation (A₅, %) | ≥ 22 | ≥ 22 |
| Impact Test (Charpy V-notch) | ≥ 27 J at 0°C | ≥ 27 J at -20°C |
Impact Toughness:
- S275J0H: Tested at 0°C (minimum 27 Joules).
- S275J2H: Tested at -20°C (minimum 27 Joules), making it suitable for colder climates.
Manufacturing and Testing
- These steel grades are typically manufactured through hot rolling processes.
- Mandatory tests include chemical analysis, tensile testing, impact testing, and dimensional inspections.
- For welded products, non-destructive testing (NDT) of the welds is also required
Applications
Construction: Buildings, bridges, and infrastructure.
Industrial Structures: Support columns, crane girders.
Transportation: Chassis components (if specified).
- S275J0H:Suitable for general structural applications such as steel frames for buildings, industrial equipment manufacturing, and infrastructure engineering.
- S275J2H:Due to its higher impact resistance at lower temperatures, it is suitable for applications in colder environments or where higher toughness is required.
Conclusion
S275J0H and S275J2H offer a balance of strength, ductility, and toughness, with S275J2H providing better low-temperature performance. They are ideal for structural applications requiring durability and weldability.
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