LR EH40 Marine Steel Plates: High-Strength Corrosion-Resistant Shipbuilding Solutions
Certified for Harsh Marine Environments
Marine steel plates are specialized structural alloys engineered to withstand saltwater corrosion, dynamic loads, and extreme temperatures. LR EH40-grade steel, approved by Lloyd’s Register (LR), combines 390 MPa yield strength with -40°C impact toughness, making it ideal for ice-class vessels and offshore platforms.
Key Features & Certifications
- 9 Global Classification Approvals: ABS, BV, CCS, DNV, GL, KR, LR, NK, RINA
- Corrosion Defense: Low-carbon base (≤0.18% C) + controlled sulfur (≤0.035%) minimizes pitting^[EN 10025]^
- Alloy-Enhanced Toughness: Micro-alloyed with Nb, V, and Ti for grain refinement and crack resistance^[ASTM A131]^
Technical Specifications
Chemical Composition (Max Wt%)
| Grade | C | Si | Mn | P | S | Al |
|---|---|---|---|---|---|---|
| AH40 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
| DH40 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
| EH40 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
| FH40 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
Alloy Additives:
- Niobium (Nb): Enhances weldability and fatigue strength
- Vanadium (V): Improves tensile-to-yield strength ratios
- Titanium (Ti): Stabilizes microstructure during thermal cycles
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test Temp (°C) | Charpy V-Impact (J) |
|---|---|---|---|---|---|
| AH40 | ≥390 | 510–660 | ≥20 | 0 | 41 |
| DH40 | ≥390 | 510–660 | ≥20 | -20 | 41 |
| EH40 | ≥390 | 510–660 | ≥20 | -40 | 41 |
| FH40 | ≥390 | 510–660 | ≥20 | -60 | 41 |
Performance Highlights:
- 660 MPa Tensile Strength: Exceeds standard A-grade ship plates by 22%^[LR Rules]^
- -60°C Toughness (FH40): Suitable for Arctic drilling rigs and LNG carriers
- Controlled Rolling (TMCP): Ensures uniform thickness (2.5–120mm) and Z35 certification
Applications
- Shipbuilding: Hulls, bulkheads, and decking for cargo ships and tankers.
- Offshore: Oil rig platforms, subsea pipelines, and floating docks.
- Coastal Infrastructure: Wave barriers, dock reinforcements, and bridge supports.
Processing & Surface Treatments
- Shot Blasting: Achieves Sa2.5 cleanliness (ISO 8501) for paint adhesion^[EN 10163]^
- Dimensions:
- Thickness: 2.5–120mm
- Width: 1,000–3,000mm
- Length: Custom-cut (plasma or flame)
- Thermal Treatments: Normalizing, quenching, or tempering available for EH40/FH40 grades
Competitive Advantages
- Cost Efficiency: 15% lower lifecycle costs vs. stainless steel alternatives
- Weldability: Pre-heating not required for thicknesses ≤25mm (AWS D1.1 compliant)
- Delivery: Mill-scaled, shot-blasted, or primed surfaces with VCI corrosion inhibitors
Certifications & Logistics
- Mandatory: LR/ABS mill certificates + EN 10204 3.1
- Testing: Charpy V-notch, PMI, ultrasonic flaw detection
- Packaging: Waterproof wrapping + edge guards for sea freight
Logical Connectors:
- Comparison: While stainless steel resists corrosion, EH40 balances strength and affordability.
- Example: For instance, offshore drillers use FH40 for ice-prone zones.
- Cause-Effect: Low sulfur (0.035%) reduces hydrogen-induced welding defects.
Request certification details or project quotes today!
MOQ 15MT. Lead time: 18–30 days. Global shipping available.
Packing And Delivery
