RINA AH36 Marine-Grade Steel Plates: High-Strength, Low-Temperature Shipbuilding Solutions
Engineered for Extreme Marine Environments
RINA AH36 marine steel plates are specialized structural alloys designed to withstand saltwater corrosion, heavy dynamic loads, and subzero temperatures. Certified by Registro Italiano Navale (RINA), these plates deliver 355 MPa yield strength and 0°C impact toughness, making them ideal for cargo ships, offshore platforms, and Arctic-class vessels.
Certifications & Compliance
- 9 IACS-Approved Societies: ABS, BV, CCS, DNV, GL, KR, LR, NK, RINA
- Standards: EN 10025, ASTM A131, and SOLAS (Safety of Life at Sea)
- Corrosion Resistance: Ultra-low carbon (≤0.18%) and sulfur (≤0.035%) minimize pitting and hydrogen cracking14
Technical Specifications
Chemical Composition (Max Wt%)
| Grade | C | Si | Mn | P | S | Al |
|---|---|---|---|---|---|---|
| AH36 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
| DH36 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
| EH36 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
| FH36 | 0.18 | 0.50 | 1.60 | 0.035 | 0.035 | 0.015 |
Alloy Benefits:
- Niobium (Nb): Enhances grain refinement during TMCP (Thermomechanical Controlled Processing).
- Vanadium (V): Improves tensile strength (up to 630 MPa) and fatigue resistance.
- Titanium (Ti): Stabilizes microstructure for consistent weldability.
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test Temp (°C) | Charpy V-Impact (J) |
|---|---|---|---|---|---|
| AH36 | ≥355 | 490–630 | ≥21 | 0 | 34 (≤50mm) / 41 (>50mm) |
| DH36 | ≥355 | 490–630 | ≥21 | -20 | 34 (≤50mm) / 41 (>50mm) |
| EH36 | ≥355 | 490–630 | ≥21 | -40 | 34 (≤50mm) / 41 (>50mm) |
| FH36 | ≥355 | 490–630 | ≥21 | -60 | 34 (≤50mm) / 41 (>50mm) |
Key Performance Metrics:
- 630 MPa Ultimate Tensile Strength: 28% higher than standard Grade A steel^[IACS UR W11]^
- -60°C Impact Toughness (FH36): 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 ≤100mm plates.
- 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 & 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: 20% 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.
- Lead Time: 20–35 days (MOQ 15MT).
Logical Connectors:
- Comparison: While duplex steels resist pitting, AH36 offers better cost-to-strength ratios.
- Example: For instance, offshore drillers use FH36 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.
Packing And Delivery
