RINA AH40-DH40-EH40-FH40 Marine Steel Plates: High-Strength Solutions for Extreme Marine Environments.
Certified Performance for Shipbuilding Excellence
RINA AH40 marine steel plates are hot-rolled, high-tensile alloys engineered to withstand saltwater corrosion, dynamic loads, and subzero temperatures. Approved by Registro Italiano Navale (RINA) and compliant with IACS standards, these plates deliver 390 MPa yield strength and -60°C impact toughness, making them ideal for ice-class vessels, offshore platforms, and LNG carriers.
Global Certifications & Key Features
- 9 IACS-Approved Classification Societies: ABS, BV, CCS, DNV, GL, KR, LR, NK, RINA
- Ultra-Low Carbon (≤0.18%): Minimizes weld brittleness and hydrogen cracking risks (EN 10025)
- Micro-Alloy Enhanced: Niobium (Nb), Vanadium (V), and Titanium (Ti) refine grain structure for fatigue 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 Benefits:
- Niobium (0.03% max): Enhances grain refinement during thermomechanical controlled processing (TMCP).
- Manganese (0.9–1.6%): Boosts tensile strength and crack resistance in welded joints.
- Low Sulfur (0.035%): Reduces porosity in submerged arc welding (SAW) applications.
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test Temp (°C) | Charpy V-Impact (J) |
|---|---|---|---|---|---|
| AH40 | ≥390 | 510–650 | ≥20 | 0 | 41 |
| DH40 | ≥390 | 510–650 | ≥20 | -20 | 41 |
| EH40 | ≥390 | 510–650 | ≥20 | -40 | 41 |
| FH40 | ≥390 | 510–650 | ≥20 | -60 | 41 |
Critical Performance Metrics:
- 650 MPa Tensile Strength: Exceeds standard Grade A steel by 27% (IACS UR W11).
- -60°C Impact Toughness (FH40): Certified for polar icebreakers and LNG carrier hulls.
- Z35 Certification: Optional through-thickness testing for critical welded joints.
Applications
- Shipbuilding: Hulls, bulkheads, and decking for container ships, tankers, and naval vessels.
- Offshore Energy: Oil rig platforms, subsea pipelines, and floating LNG terminals.
- Cryogenic Infrastructure: Storage tanks, Arctic drilling equipment, and ice-resistant structures.
Advanced Processing & Surface Treatments
- Shot Blasting: Achieves Sa2.5 surface cleanliness (ISO 8501) for superior paint adhesion (EN 10163).
- Thermal Treatments:
- Normalizing: Refines grain structure for thicknesses >50mm.
- TMCP: Combines controlled rolling and cooling for plates ≤100mm.
- Dimensions:
- Thickness: 2.5–120mm (precision-cut via plasma or laser).
- Width: 1,000–3,000mm (edge-milled for tight tolerances).
- Length: Customized up to 18m.
Industry Innovations & Market Trends
- High-Strength Demand: 5m-wide plates and 200–300mm thicknesses for mega-container ships.
- Eco-Friendly Coatings: Compatible with Zn-Al-Mg (ZAM) coatings for 50+ year service life.
- Automated Welding: Pre-qualified for robotic SAW (Submerged Arc Welding) and FCAW (Flux-Cored Arc Welding).
Competitive Advantages
- Cost Efficiency: 18% lower lifecycle costs compared to duplex stainless steels.
- Weldability: No pre-heating required for plates ≤25mm (AWS D1.1/D1.6 compliant).
- Global Compliance: RINA/ABS mill certificates + EN 10204 3.1 inspection reports.
Quality Assurance & Logistics
- Mandatory Testing: Ultrasonic flaw detection (UT), PMI (Positive Material Identification), and bend tests.
- Packaging: VCI-coated waterproof wrapping + edge protectors for海运.
- Lead Time: 20–35 days (MOQ 15MT).
Logical Connectors:
- Comparison: While duplex steels resist pitting, AH40 offers better cost-to-strength ratios.
- Example: For instance, offshore drillers use FH40 for ice-prone zones.
- Cause-Effect: Low sulfur (0.035%) reduces slag formation in high-heat welds.
Request Technical Datasheets or Custom Quotes Today!
Global shipping available. Certifications: RINA, ABS, LR, DNV-GL.
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