EN 10025 S275JR and S355J2-steel_4448.html target=_blank class=infotextkey>S355JR are two commonly used structural steel grades in Europe, defined by the EN 10025-2 standard. Both are non-alloy steels with good weldability and mechanical properties, but they differ in strength and applications. Below is a detailed comparison of their chemical composition, mechanical properties, and typical uses:
| Element | S275JR | S355JR |
|---|---|---|
| Carbon (C) | ≤ 0.21% | ≤ 0.24% |
| Manganese (Mn) | ≤ 1.50% | ≤ 1.60% |
| Phosphorus (P) | ≤ 0.035% | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% | ≤ 0.035% |
| Silicon (Si) | ≤ 0.35% | ≤ 0.55% |
| Property | S275JR | S355JR |
|---|---|---|
| Yield Strength (ReH) | ≥ 275 MPa (40,000 psi) | ≥ 355 MPa (51,500 psi) |
| Tensile Strength (Rm) | 410–560 MPa (59,500–81,200 psi) | 470–630 MPa (68,200–91,400 psi) |
| Elongation (A) | ≥ 23% (in 200 mm gauge length) | ≥ 22% (in 200 mm gauge length) |
| Charpy V-Notch Impact | ≥ 27 J at 20°C (68°F) | ≥ 27 J at 20°C (68°F) |
| Industry | S275JR | S355JR |
|---|---|---|
| Construction | Light structural frames, roofing | Heavy structural frames, bridges |
| Machinery | General-purpose components | High-stress components |
| Transportation | Trailer frames, rail components | Heavy-duty truck frames, crane booms |
| Energy | Transmission towers | Wind turbine towers |
| Aspect | S275JR | S355JR |
|---|---|---|
| Strength | Lower | Higher |
| Cost | Lower | Higher |
| Typical Use | Light to medium loads | Medium to heavy loads |
Choose S275JR if:
The application requires moderate strength (e.g., light structural frames, general machinery).
Cost is a primary concern.
Choose S355JR if:
Higher strength is required for heavy-load applications (e.g., bridges, cranes, wind turbines).
The structure needs to withstand dynamic or impact loading.
| Standard | S275JR | S355JR |
|---|---|---|
| ASTM | A283 Grade C | A572 Grade 50 |
| JIS | Ss400 | SM490 |
| GB/T | Q275 | Q355 |
If you need further guidance on material selection for a specific application, feel free to ask!
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