S355J2+N Round Bars
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S355J2+N is a high-strength, low-alloy structural steel from the European standard EN 10025-2. The "S" denotes structural steel, "355" refers to its minimum yield strength of 355 MPa, "J2" indicates its impact toughness, tested at -20°C, and the "+N" signifies that it is supplied in the normalized condition, which improves its toughness and uniformity. S355J2+N is widely used in construction, bridges, offshore structures, and other engineering applications where strength, toughness, and good weldability are required, especially in colder climates or dynamic loading environments.
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| Property | Specification |
|---|---|
| Standard | DIN 17100 St52-3N, EN 10025-2 S355J2+N |
| Chemical Composition | C: ≤ 0.22%, Mn: 1.50%, P: ≤ 0.035%, S: ≤ 0.035%, Si: 0.55% (max) |
| Tensile Strength (MPa) | 490 - 630 MPa |
| Yield Strength (MPa) | ≥ 355 MPa (for thickness ≤ 16mm) |
| Elongation (%) | Minimum 20% (in 50 mm gauge length) |
| Impact Toughness | 27 Joules at -20°C |
| Hardness (HBW) | Approximately 160 - 180 HB |
| Modulus of Elasticity (GPa) | 210 GPa |
| Density (g/cm³) | 7.85 g/cm³ |
| Thermal Conductivity (W/m·K) | 50 W/m·K (at 20°C) |
| Specific Heat Capacity (J/kg·K) | 486 J/kg·K (at 20°C) |
| Heat Treatment | Normalized condition (N) |
| Applications | Bridges, cranes, structural components, load-bearing applications, machinery parts |
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