Products FAQ
What processing and customization services do you offer?
We offer value-added services such as cutting, polishing, surface rust removal, and heat treatment. We can also customize steel plates to special specifications based on customers’ project drawings to meet their specific engineering needs.
What is the equivalent of DNV Grade DH32 marine steel?
ABS Grade DH32 (ABS DH32), CCS Grade DH32 (CCS DH32), LR Grade DH32 (LR DH32), BV Grade DH32 (BV DH32), etc.
What is the difference between DNV DH32 and DNV AH32 marine steel?
DNV DH32 marine steel has better low-temperature toughness (-20°C) than DNV AH32 marine steel and is suitable for colder waters and marine structures subjected to higher loads, while DNV AH32 is more suitable for traditional coastal shipbuilding projects.
Does your company offer custom specifications for its DNV Grade DH32 shipbuilding steel plates?
Yes. We can customize thickness, dimensions, and surface treatment based on customer drawings and project requirements, and we also provide precision cutting and machining services.
Do you supply DNV Grade DH32 shipbuilding steel plates certified for export?
Yes. All of our DNV Grade DH32 shipbuilding steel plates are DNV-certified and come with complete Material Test Certificates (MTCs) and certification documents, supporting global exports and third-party inspections (SGS, BV, etc.).
What is the weldability of DNV Grade AH36 steel?
DNV Grade AH36 steel has excellent weldability; however, preheating conditions and process parameters must be strictly controlled during actual welding. The specific points are as follows:
1. Preheating Requirements
For fillet and butt welds with plate thicknesses > 30 mm, the preheating temperature before welding should be 120 - 150 °C;
For plate thickness ≤ 30 mm and ambient temperatures below 5 °C, the preheating temperature should not be lower than 75 °C.
2. Common Welding Methods
Conventional arc welding processes such as Shielded Metal Arc Welding (SMAW), Submerged Arc Welding (SAW), and Flux-Cored Arc Welding (FCAW) are recommended.
3. Welding Quality
Relevant studies indicate that, under appropriate welding procedure specifications (WPS), the impact toughness of all regions (weld, fusion zone, and heat-affected zone) in DNV Grade AH36 welded joints meets the requirements of classification society regulations, demonstrating good process adaptability.
What are the differences between NV A36, NV D36, and NV E36 shipbuilding steel plates?
The key differences between these three types of shipbuilding steel plates lie in their low-temperature impact toughness and applications:
| Grade | Yield Strength | Tensile Strength | Impact Test Temperature | Applications |
|---|---|---|---|---|
| NV A36 | ≥ 355 MPa | 490–630 MPa | 0°C | Coastal vessels, decks, superstructures, mild-temperature waters |
| NV D36 | ≥ 355 MPa | 490–630 MPa | -20°C | Vessels in cold regions, hull bottoms, bulkheads |
| NV E36 | ≥ 355 MPa | 490–630 MPa | -40°C | Arctic vessels, offshore platforms, low-temperature marine structures |
Note: Do not substitute grades arbitrarily; adhere to DNV design temperature requirements.
Do you offer custom processing for marine steel plates?
Yes, we provide a range of value-added services, including cutting, bending, drilling, rust removal, and painting, and can customize dimensions and processing solutions based on customer drawings and project requirements.
Do you provide certified MTC documents for DNV Grade AH36 shipbuilding stee plates?
Yes. We provide MTC compliant with DNV standards for each batch of products, which support third-party inspection.
What is the difference between DNV Grade AH36 and DNV Grade DH36 shipbuilding steel plates?
Both are high-strength structural steel plates for shipbuilding with a yield strength of at least 355 MPa, in compliance with DNV regulations. The key difference lies in the minimum service temperature:
AH36: Design operating temperature ≥ 0°C, impact test temperature 0°C; suitable for warm waters.
DH36: Offers superior low-temperature toughness, with an impact test temperature of -20°C, and is suitable for cold waters.
