| Grade | S355N |
| European standard steel | 1.0545 |
| Standard | EN 10025-3-2004 |
| Hot rolled products of structural steels – Part 3: Technical delivery conditions for normalized/normalized rolled weldable fine grain structural steels | |
| Classification | Alloy steel |
| Performance | Weldability |
| Introductions | It is a European standard hot-rolled structural steel product, the same series of other materials such as S355JO, S355K2, S355J2 and so on. Tensile strength (Mpa) : 470-630. Mainly used in large ships, Bridges, power plant equipment, medium and high pressure boilers, high pressure vessels, rolling stock, lifting machinery, mining machinery and other large welded structural parts. |
| S355N Chemical Element Content (%) | ||||||||||||||
| Constituent | C | Si | Mn | P ① | S ①② | Cr | Ni | Cu ④ | Mo | N | Ti | V | Nb | Al ③ |
| Min | – | – | 0.9 | – | – | – | – | – | – | – | – | – | – | 0.02 |
| Max | 0.2 | 0.5 | 1.65 | 0.03 | 0.025 | 0.3 | 0.5 | 0.55 | 0.1 | 0.015 | 0.05 | 0.12 | 0.05 | – |
| ① For long products the P and S content can be 0.005% higher. ② For railway applications a maximum S content of 0.010% may be agreed at the time of enquiry and order. ③ If sufficient other N-binding elements are present the minimum total Al content does not apply. ④ Cu content above 0.40% may cause hot shortness during hot forming. |
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| S355N Mechanical properties | |
| Condition | Tensile Strength |
| σb | |
| Mpa | |
| t≤16 | 470~630 |
| 16<t≤40 | 470~630 |
| 40<t≤63 | 470~630 |
| 63<t≤80 | 470~630 |
| 80<t≤100 | 470~630 |
| For plate,strip and wide flats with widths≥600mm the direction transverse (t) to the rolling direction applies. For all other products the values apply for the direction parallel (l) to the rolling direction | |
| Approximate comparison table-Carbon structural steel and engineering steel | ||||||||
| China | America | Germany | France | European standard | Russia | Sweden | United Kingdom | |
| GB | ASTM | DIN EN/DIN | NF EN/NF | EN | Numerical grade | GOST | SS | BS EN/BS |
| Q345D | A572Gr.50 | StE355 | E355R | S355N | 1.0545 | 15GF | Jan-34 | 50DD |
| FeE355KGN① | 50E | |||||||
