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Marine & Offshore Steel Plate – Certified High-Strength Shipbuilding Solutions
Our Marine & Offshore Steel Plates are specifically engineered to withstand the harshest maritime environments, from corrosive saltwater to extreme Arctic temperatures. We provide high-quality, certified plates used in the construction of commercial vessels, offshore drilling platforms, and FPSO units. With a focus on structural integrity and "Z-direction" properties to prevent lamellar tearing, our plates ensure long-term safety for critical offshore assets.
Common Standards and Classification Societies
All our marine steel is fully traceable and certified by the world's leading classification societies (IACS members):
Classification Societies: ABS, DNV, LR, BV, GL, KR, NK, RINA, CCS.
ASTM Standards:
ASTM A131: The primary standard for shipbuilding steel.
Common Grades: Grade A, B, D, E (Ordinary Strength) and AH32, DH32, EH32, AH36, DH36, EH36 (Higher Strength).
Offshore Structural Standards:
API 2H / 2W / 2Y: High-strength plates for offshore structures (e.g., Grade 50).
EN 10225: Weldable structural steels for fixed offshore structures (S355G7, S355G8, S420, S460).
Dimensions and Technical Specifications
We provide a massive range of sizes to minimize the number of welds required in large-scale hull or platform construction:
|
Feature |
Specification Range |
|
Thickness (WT) |
5mm to 150mm (Up to 300mm for specialized offshore blocks) |
|
Width |
1500mm, 2000mm, 2500mm, 3000mm, 4000mm (Super-wide plates) |
|
Length |
6000mm, 9000mm, 12000mm (Custom lengths up to 18000mm) |
|
Surface Treatment |
Shot-blasted and Shop Primed (Pre-painted to prevent rust during storage) |
|
Heat Treatment |
AR (As Rolled), TMCP (Thermo-Mechanical Control Process), N (Normalized) |
Core Application Fields
Marine and offshore plates are essential for projects where failure is not an option:
Shipbuilding: Hulls of bulk carriers, oil tankers, container ships, and luxury cruise liners.
Offshore Platforms: Jack-up rigs, semi-submersible platforms, and fixed offshore jackets.
FPSO & FSO: Floating Production Storage and Offloading vessel conversions and newbuilds.
Renewable Energy: Foundations for offshore wind turbines and transition pieces.
Marine Equipment: Ship cranes, deck machinery, and watertight bulkheads.
Chemical Composition Comparison Table
| Steel Grade | C (max) | Si (max) | Mn | P (max) | S (max) | Al (min) | Ni (max) | CEV (max) |
| S355G7+M/N | 0.18 | 0.5 | 1.6 | 0.025 | 0.015 | 0.02 | 0.3 | 0.43 |
| S355G10+M | 0.14 | 0.5 | 1.6 | 0.02 | 0.005 | 0.018 | 0.5 | 0.39 |
| S420G2+M | 0.16 | 0.5 | 1.7 | 0.02 | 0.005 | 0.018 | 0.5 | 0.43 |
| S460G2+M | 0.16 | 0.5 | 1.7 | 0.02 | 0.005 | 0.018 | 0.7 | 0.45 |
Marine & Offshore Steel Plate Standards
| Category | Standard | Common Steel Grades |
| Shipbuilding (Normal Strength) | ASTM A131 / Class Societies | Grade A, B, D, E |
| Shipbuilding (Higher Strength) | ASTM A131 / Class Societies | AH32, DH32, EH32, FH32AH36, DH36, EH36, FH36AH40, DH40, EH40, FH40 |
| Offshore Structural Steel | API Spec 2H / 2W / 2Y | Grade 42, Grade 50, Grade 60 |
| High-Strength Quenched & Tempered | EN 10225 | S355G2+N, S355G3+N, S355G7+M, S420G2+M, S460G2+M |
| ASTM A572 / A588 | Grade 50, Grade 60 (Weathering Steel) | |
| ASTM A514 | Grade Q, Grade S (Yield strength up to 690 MPa) | |
| EN 10025-6 | S690QL, S890QL, S960QL |
Carbon Steel Plate Production Process
Package and marking
According to customer's requirements, more than two steel plates can be bundled as following.
1. Two or more steel plates are bare and bound, and the unit plate are not bound.
2. Horizontal binding not less than four,the edge can be protected angle.
3. The straps at both ends are fixed at 200~500 mm from the end of the plate.
Marking
1. The marking is eye-catching, firm,clear and standard,and does not fade.The marking information Includes Surface painting, side painting (side label) and die stamping.
2. Surface painting contains the following information: Forever steel company logo, steel grade,standard,plate number, plate dimensions, heat number, special painting (CE certification, vessel certification, API certification, etc.), special requirements of the customer.
3. Side painting (side label) paste flat, firm, parallel to the direction of the steel plate rolling, information includes steel grade, plate number, plate dimensions, special requirements of the customer.
4. Die stamping: suitable for shipbuilding plate, CE certification plate, API certification plate, vessel plate and steel plate required by customer, information includes: steel grade, plate number, special information (ship certification, CE certification and API certification, etc.), special requirements of the customer.
