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S355G3+N steel plate is a welded structural steel for fixed offshore structures, "S" means structural steel, "355" means the minimum yield strength of the steel plate, G3 means the relevant numbers of the steel grade characteristics, N is the normalized or normalized rolling delivery state .
S355G3+N steel plate executive standard: EN 10225-2009.
S355G3+N steel plate delivery status: normalized rolling, normalized.
Smelting analysis of chemical composition of S355G3+N steel plate:
| C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Nb | V | Ti | Alt | N | Ceq Max |
| ≤0.18 | ≤0.5 | 0.9-1.65 | ≤0.03 | ≤0.025 | ≤0.5 | ≤0.3 | ≤0.1 | ≤0.35 | ≤0.06 | ≤0.12 | ≤0.03 | ≥0.02 | ≤0.015 | ≤0.43 |
Ingredient Notes: Alt/N≥2. Ceq = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Mechanical properties of S355G3+N steel plate:
| Thickness | Mechanical properties | |
| ≤16mm | ReH(MPa) | ≥355 |
| Rm(MPa) | 470-630 | |
| A(%) | ≥22 | |
| Impact temperature | -40 | |
| Akv(J) | ≥50 | |
| >16-40mm | ReH(MPa) | ≥345 |
| Rm(MPa) | 470-630 | |
| A(%) | ≥22 | |
| Impact temperature | -40 | |
| Akv(J) | ≥50 | |
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