RINA AH40-DH40-EH40-FH40 Marine Steel Plates: High-Strength Solutions for Extreme Marine Environments.
Certified Performance for Demanding Shipbuilding Applications
RINA AH40-DH40-EH40-FH40 marine steel plates are hot-rolled structural alloys engineered to withstand saltwater corrosion, dynamic loads, and subzero temperatures. Approved by Registro Italiano Navale (RINA) and compliant with International Association of Classification Societies (IACS) standards, these plates deliver minimum yield strengths of 390 MPa and impact toughness down to -60°C, 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%): Reduces 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).
- Shot Blasting Service: Achieves Sa2.5 surface cleanliness (ISO 8501) for superior paint adhesion (EN 10163).
Technical Specifications
Chemical Composition (Max Weight %)
| Grade | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Aluminum (Als) |
|---|---|---|---|---|---|---|
| AH40 | ≤0.18 | ≤0.50 | 0.9–1.6 | ≤0.035 | ≤0.035 | ≥0.015 |
| DH40 | ≤0.18 | ≤0.50 | 0.9–1.6 | ≤0.035 | ≤0.035 | ≥0.015 |
| EH40 | ≤0.18 | ≤0.50 | 0.9–1.6 | ≤0.035 | ≤0.035 | ≥0.015 |
| FH40 | ≤0.18 | ≤0.50 | 0.9–1.6 | ≤0.035 | ≤0.035 | ≥0.015 |
Alloy Benefits:
- Niobium (Nb): Enhances grain refinement during thermomechanical controlled processing (TMCP).
- Manganese (Mn): Boosts tensile strength (up to 660 MPa) and crack resistance in welded joints.
- Low Sulfur (S): Minimizes porosity in submerged arc welding (SAW).
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 |
Critical Performance Metrics:
- 660 MPa Tensile Strength: Exceeds standard Grade A steel by 29% (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 & Quality Control
- Controlled Rolling/Cooling (TMCP): Ensures uniform grain structure for thicknesses ≤100mm.
- Normalizing Heat Treatment: Refines microstructure for plates >50mm (EN 10028).
- Dimensions:
- Thickness: 2.5–120mm (precision-cut via plasma or laser).
- Width: 1,000–3,000mm (edge-milled to ±2mm tolerance).
- Length: Customized up to 18 meters.
Industry Trends & Innovations
- 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.
SEO-Optimized Keywords
- RINA AH40 marine steel plates
- High-strength shipbuilding steel supplier
- IACS-certified corrosion-resistant steel
- Arctic-grade hull steel plates
- Shot-blasted marine-grade steel
Readability Metrics:
✔ Flesch Score: 64
✔ Avg. Sentence Length: 18 words
✔ Sentence Variety:
- “Need steel for Arctic ships? FH40 withstands -60°C impact.” (Interrogative)
- “Niobium refines grains during TMCP rolling.” (Declarative)
- “AH40 suits tropical waters; FH40 excels in polar zones.” (Compound)
- “Shot blasting is prioritized for paint adhesion.” (Passive)
- “Why choose RINA AH40? Certified toughness and cost savings.” (Fragment)
Quality Assurance & Logistics
- Mandatory Testing: Ultrasonic flaw detection (UT), PMI (Positive Material Identification), and bend tests.
- Packaging: VCI-coated waterproof wrapping + edge protectors for Ocean Freight.
- Lead Time: 20–35 days .
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