Description
EN 10225 Steel for Offshore Structures
EN 10225 is a European standard that defines the technical delivery standards for weldable structural steels used in the construction of offshore constructions. These steels are designed to withstand harsh marine environments, ensuring high strength, toughness, and resistance to brittle fracture.
Key Features of EN 10225 Steel:
- High Strength & Toughness: Provides excellent mechanical properties for offshore applications.
- Weldability: Designed for easy fabrication and welding.
- Impact Resistance: Ensures durability in low-temperature and high-pressure environments.
- Corrosion Resistance: Suitable for offshore exposure to seawater and harsh weather conditions.
Grades of EN 10225 Steel:
- S355G – Basic structural grade, suitable for offshore applications.
- S420G – Higher strength for larger and more demanding structures.
- S460G – Advanced high-strength steel for extreme offshore conditions.
- S500G – Ultra-high-strength steel for deep-water and heavy-load structures.
Chemical Composition
| Grade | C (max) | Si (max) | Mn | P (max) | S (max) | Cu (max) | Ni (max) | Cr (max) | Mo (max) | V (max) |
|---|---|---|---|---|---|---|---|---|---|---|
| S355G2+N | 0.18 | 0.50 | 1.10-1.70 | 0.030 | 0.025 | 0.30 | 0.40 | 0.25 | 0.10 | 0.08 |
| S355G3+N | 0.18 | 0.50 | 1.10-1.70 | 0.030 | 0.025 | 0.30 | 0.40 | 0.25 | 0.10 | 0.08 |
| S355G7+M | 0.16 | 0.50 | 1.10-1.70 | 0.030 | 0.025 | 0.30 | 0.40 | 0.25 | 0.10 | 0.08 |
| S355G8+M | 0.16 | 0.50 | 1.10-1.70 | 0.030 | 0.025 | 0.30 | 0.40 | 0.25 | 0.10 | 0.08 |
| S420G2+M | 0.18 | 0.50 | 1.30-1.80 | 0.030 | 0.025 | 0.30 | 0.40 | 0.30 | 0.10 | 0.10 |
| S460G2+M | 0.20 | 0.50 | 1.50-2.00 | 0.030 | 0.025 | 0.30 | 0.40 | 0.30 | 0.10 | 0.10 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test Temp (°C) | Charpy V-Notch Impact (J) |
|---|---|---|---|---|---|
| S355G2+N | 355 | 470-630 | 22 | -20 | 40 |
| S355G3+N | 355 | 470-630 | 22 | -20 | 40 |
| S355G7+M | 355 | 470-630 | 22 | -40 | 40 |
| S355G8+M | 355 | 470-630 | 22 | -40 | 40 |
| S420G2+M | 420 | 520-680 | 19 | -40 | 40 |
| S460G2+M | 460 | 540-720 | 17 | -40 | 40 |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.85 |
| Thermal Conductivity (W/m·K) | 50 |
| Electrical Resistivity (Ω·m) | 1.59 × 10⁻⁷ |
| Melting Point (°C) | 1425-1460 |
Applications
- Offshore platforms and rigs
- Subsea pipelines and structures
- Jack-up rigs and wind farm foundations
- Oil and gas production facilities
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