AH36-DH36-EH36-FH36 Marine Steel Plates: High-Strength, Low-Temperature Shipbuilding Solutions.
Certified for Harsh Marine & Subzero Environments
Marine steel plates are specialized alloys engineered to withstand saltwater corrosion, heavy dynamic loads, and extreme temperatures. Grades AH36 to FH36, approved by 9 global classification societies, offer yield strengths up to 355 MPa and impact toughness as low as -60°C. These plates are ideal for ice-class vessels, Arctic offshore platforms, and cryogenic storage tanks.
Key Features & Certifications
- 9 IACS-Approved 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]^
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 (0.03% max): Improves grain refinement during controlled rolling (TMCP).
- Manganese (0.9–1.6%): Enhances tensile strength and crack resistance.
- Low Sulfur (0.035%): 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) |
|---|---|---|---|---|---|
| AH36 | ≥355 | 490–630 | ≥21 | 0 | 34 |
| DH36 | ≥355 | 490–630 | ≥21 | -20 | 34 |
| EH36 | ≥355 | 490–630 | ≥21 | -40 | 34 |
| FH36 | ≥355 | 490–630 | ≥21 | -60 | 34 |
Performance Highlights:
- 630 MPa Tensile Strength: Exceeds standard Grade A steel by 28%^[IACS UR W11]^.
- -60°C Toughness (FH36): Certified for polar icebreakers and LNG carrier hulls.
- Z35 Certification: Optional through-thickness testing for critical joints.
Applications
- Shipbuilding: Ice-class vessel hulls, bulkheads, and offshore drilling rigs.
- Cryogenic Engineering: LNG storage tanks, polar pipeline systems.
- Coastal Infrastructure: Heavy-load port cranes, wave-resistant breakwaters.
Processing & Surface Treatments
- Shot Blasting: Achieves Sa2.5 surface cleanliness (ISO 8501) for superior paint adhesion^[EN 10163]^.
- Thermal Treatments: Normalizing or TMCP ensures uniform grain structure.
- Dimensions:
- Thickness: 2.5–120mm (thermomechanical rolling for ≤100mm).
- Width: 1,000–3,000mm (plasma-cut edges available).
- Length: Customized up to 18m.
Industry Trends & Innovations
- High-Strength Demand: 5m-wide plates and 200–300mm thicknesses for mega-container ships.
- Eco-Friendly Coating: Compatible with zinc-aluminum-magnesium (ZAM) coatings for 50+ year lifespans.
- Automated Welding: Pre-qualified for robotic SAW and FCAW processes (AWS D1.1/D1.6).
Competitive Advantages
- Cost Efficiency: 20% lower lifecycle costs vs. duplex stainless steels.
- Weldability: No pre-heating required for thicknesses ≤25mm.
- Certifications: ABS, LR, DNV-GL, and BV mill certificates + EN 10204 3.1.
Certifications & Logistics
- Mandatory: Mill test certificates (MTC) with Charpy V-notch results.
- Testing: Ultrasonic flaw detection (UT), PMI, and bend testing.
- Packaging: VCI-coated waterproof wrapping + edge protectors for.
Product Show
Supplier of various types of carbon steel
Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.
