S355J2 (+N)
S355J2 (1.0577) – Structural steel: Properties, applications, and technical specifications
S355J2 (digital code 1.0577 according to EN 10025-2 standard) is one of the most widely used non-alloy quality structural steels in industry and construction. It features a high yield strength, excellent weldability, and impact resistance even at low temperatures. Because of these properties, it is an indispensable material for critical load-bearing structures and heavy machinery. At UAB „Antėjas”, we offer this steel for fast delivery directly from our wholesale warehouses.
1. What does the S355J2 designation mean?
- S (Structural): Indicates that it is a structural steel.
- 355: Indicates the minimum yield strength (ReH) in megapascals (MPa) for the thinnest products (up to 16 mm thick).
- J2: Indicates guaranteed impact energy (min. 27 Joules) at -20 °C. This is especially important for structures operating outdoors during winter.
2. Chemical composition (according to EN 10025-2)
| C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cu (%) | CEV |
|---|---|---|---|---|---|---|
| Max. 0.20 – 0.22 | Max. 0.55 | Max. 1.60 | Max. 0.03 | Max. 0.03 | Max. 0.55 | Max. 0.45 – 0.47 |
* Maximum values of Carbon (C) and Carbon Equivalent (CEV) depend on the thickness of the product.
3. Mechanical properties
| Thickness (mm) | Min. yield strength (ReH), MPa | Tensile strength (Rm), MPa | Elongation (A), % | Impact energy (KV) at -20 °C |
|---|---|---|---|---|
| Up to 16 mm | 355 | 470 – 630 | 14 – 22 | 27 J |
| 16 – 40 mm | 345 | 470 – 630 | 14 – 22 | 27 J |
| 40 – 63 mm | 335 | 470 – 630 | 14 – 21 | 27 J |
4. Main applications
- Load-bearing building structures (beams, columns, bridge elements);
- Booms and frames for heavy lifting equipment, cranes, and excavators;
- Wind turbine components and offshore structures;
- Production of agricultural and railway transport parts.
5. International equivalents
In the global market, S355J2 steel has the following equivalents: Germany (DIN): St52-3N, Europe (old EN): Fe010D2 / S355J2G4, USA: A550, China (GB): Q345D, Japan (JIS): SS490YA, Czech Republic (CSN): 11531.
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