Thickness: 4mm to 260mm, Width: 1200mm to 4000mm Length: 3000mm to 18000mm.

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AH40/DH40/EH40 High-Strength Marine Steel Plates

Product Overview

AH40, DH40, and EH40 are premium high-tensile shipbuilding steels certified by leading classification societies (e.g., CCS, ABS, DNV, BV). Designed for critical marine applications, these grades excel in strength, low-temperature toughness, and corrosion resistance, meeting the rigorous demands of modern shipbuilding and offshore engineering.

Manufacturing Excellence

• Thermo-Mechanical Controlled Processing (TMCP): Ensures uniform mechanical properties and eliminates preheating for plates ≤30mm.
• Heat Treatment: Normalizing, quenching, or tempering for thicknesses >50mm to enhance weldability.
• Surface Finishing: Shot blasting (SA 2.5 standard) and anti-rust coatings for corrosion resistance.

Applications

• Shipbuilding: Hulls, decks, bulkheads (AH40); LNG carrier components (EH40); ice-class vessels (DH40).
• Offshore Engineering: Oil rigs, subsea pipelines, and drilling platforms.
• Infrastructure: Heavy-duty bridges and coastal structures requiring high corrosion resistance.

Certifications & Standards

• Compliance: Certified by CCS, ABS, DNV, LR, NK, and 9+ global classification societies.
• Testing Protocols:
  • Ultrasonic inspection for internal defects.
  • Charpy V-notch impact tests at specified temperatures.
  • CTOD (Crack Tip Opening Displacement) testing for critical weld zones.

Custom Processing & Dimensions

• Thickness: 5–150mm (up to 300mm for special orders).
• Width: Up to 3,900mm (ideal for large hull sections).
• Processing: Flame cutting, laser cutting, and precision bending (cold/hot).

Welding & Fabrication Guidelines

• Preheating Requirements:
  • Plates >30mm: Preheat to 120–150°C before welding.
  • Ambient Temp <5°C: Preheat to 75°C for plates ≤30mm.
• Welding Methods: SMAW, SAW, and FCAW with compatible electrodes.

Industry Trends & Advantages

1. High-Strength Demand: Rising use of 5m-wide plates and 200–300mm thick boards for mega-container ships and Arctic-class vessels.
2. Sustainability: Reduced material consumption and CO2 emissions due to higher strength-to-weight ratios.
3. Micro-Alloy Innovation: Nb/V additions improve toughness while maintaining weldability.

Why Choose AH40/DH40/EH40?

1. Extreme Environment Performance: EH40 withstands -40°C, DH40 excels in polar conditions, and AH40 offers cost-effective strength for tropical waters.
2. Global Compliance: Recognized by 116 flag authorities via CCS certification.
3. End-to-End Support: Full documentation, including mill test reports and tailored packaging.

Contact us for technical datasheets or customized solutions.
Engineered for resilience, trusted by global shipyards.