AH40/DH40/EH40
Thickness: 4mm to 260mm, Width: 1200mm to 4000mm Length: 3000mm to 18000mm.
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
- High-Strength Demand: Rising use of 5m-wide plates and 200–300mm thick boards for mega-container ships and Arctic-class vessels.
- Sustainability: Reduced material consumption and CO2 emissions due to higher strength-to-weight ratios.
- Micro-Alloy Innovation: Nb/V additions improve toughness while maintaining weldability.
Why Choose AH40/DH40/EH40?
- Extreme Environment Performance: EH40 withstands -40°C, DH40 excels in polar conditions, and AH40 offers cost-effective strength for tropical waters.
- Global Compliance: Recognized by 116 flag authorities via CCS certification.
- 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.
Frequently asked questions
Do you keep large quantities in stock monthly?
Yes, we are Baosteel's long-term first-level dealer, always keeping a large amount of steel in stock, and give priority to ordering and scheduling production at Baosteel Group as well as Xingcheng Special Steel.
Can we visit your office and the warehouse?
Of course, we welcome you to visit our office and warehosue. We can also show you all all the production lines of steel mills we cooperated with to more about our capacity and quality.
Do you have quality control system?
We have ISO, BV, SGS certifications and cand conduct product performance testing based on customer requirements.
Can you provide steel processing services?
We have multiple warehouses with long-term agreements, able to provide high-quality processing and packaging services to meet your requirement.
What are the payment methods?
We accept T/T and L/C. For other payment methods, please contact us for further communication.
How long is your delivery time?
For goods in stock , it takes 3 to 7 days.If we need to order from steel mills, it will take around 25-45 days depends on the specific products and different steel mills.
How do you keep long-term business and good relationship?
We always keep supplying good quality products with competitive prices and provide one stop service.We wish to establish long-term cooperative relationships with you, to achieve the best interests and to become the true friends.