API 2W Offshore and marine structural steel plate
API 2W steel plates are high-strength materials designed for offshore and marine structures. We supply certified industrial-grade plates for
demanding environments.
1. High Strength and Durability
2. Excellent Corrosion Resistance
3. Compliant with API and International Standards
API 2W Offshore and marine structural steel description
API 2W is a high-performance steel grade specifically designed for offshore and marine structures, offering superior strength, toughness, and corrosion resistance. As a leading China-based manufacturer and bulk exporter, we supply API 2W Grade 50/60 plates with excellent weldability and fatigue resistance, ideal for shipbuilding, oil rigs, and coastal infrastructure.
Our plates are available in thicknesses ranging from 10mm to 50mm, fully compliant with API standards, ensuring reliability in harsh marine environments. Trusted by fabricators, shipyards, and EPC contractors, our steel delivers durability for critical structural applications.
API 2W Grades-Chemical Composition/Tensile Requirements
| API 2W Grades – Chemical Composition (%) | |||||
| Property | 2W50 | 2W60 | 2W70 | 2W80 | 2W90 |
| C (max) | 0.18 | 0.18 | 0.2 | 0.2 | 0.2 |
| Mn (max) | 1.6 | 1.6 | 1.7 | 1.7 | 1.7 |
| P (max) | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 |
| S (max) | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 |
| Si (max) | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Cu (min) | 0.2 | 0.2 | 0.25 | 0.25 | 0.25 |
| Ni (min) | – | – | 0.4 | 0.5 | 0.5 |
| Cr (min) | – | – | 0.15 | 0.25 | 0.25 |
| Mo (min) | – | – | 0.1 | 0.15 | 0.15 |
| V (min) | – | – | – | 0.03 | 0.03 |
| Other Elements | – | – | Nb, Ti* | Nb, Ti* | Nb, Ti* |
| API 2W Grades – Mechanical Properties | |||||
| Property | 2W50 | 2W60 | 2W70 | 2W80 | 2W90 |
| Yield Strength (min, MPa) | 345 | 415 | 485 | 550 | 620 |
| Tensile Strength (MPa) | 450 – 585 | 520 – 655 | 585 – 725 | 655 – 795 | 725 – 895 |
| Elongation (min, %) | 20 | 20 | 20 | 18 | 18 |
| Charpy V-Notch Impact (min, J) | 34 (at -10°C) | 41 (at-10°C) | 41 at -10°C) | 41 (at-10°C) | 41 (at-10°C) |
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API 2W Offshore and marine structural steel Application
API 2W steel plates are specifically designed for offshore and marine applications, offering high strength, toughness, and corrosion resistance in harsh environments. In the oil & gas sector, they are widely used in the construction of offshore platforms, subsea structures, and floating production storage vessels (FPSOs), where they withstand extreme wave loads and saline conditions. The shipbuilding industry relies on API 2W for hulls, decks, and bulkheads in cargo ships, tankers, and ice-class vessels due to its excellent weldability and fatigue resistance.
For wind energy projects, API 2W is ideal for offshore wind turbine foundations and transition pieces, ensuring durability in corrosive marine atmospheres. The steel also performs well in bridge construction, particularly for coastal and deep-water bridges exposed to saltwater and high stress. Additionally, it is used in port infrastructure, such as docks, piers, and mooring systems, where impact resistance and long-term structural integrity are critical.
With its combination of high yield strength, low-temperature toughness, and resistance to seawater corrosion, API 2W is a trusted choice for EPC contractors and marine engineers working in demanding offshore environments worldwide.
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